linux-kernel - [PATCH 6/7] bcachefs: shrinker.to

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Date:   Wed, 22 Nov 2023 18:25:11 -0500
From:   Kent Overstreet <kent.overstreet@...ux.dev>
To:     linux-mm@...ck.org, linux-kernel@...r.kernel.org
Cc:     Kent Overstreet <kent.overstreet@...ux.dev>
Subject: [PATCH 6/7] bcachefs: shrinker.to_text() methods

This adds shrinker.to_text() methods for our shrinkers and hooks them up
to our existing to_text() functions.

Signed-off-by: Kent Overstreet <kent.overstreet@...ux.dev>
---
 fs/bcachefs/btree_cache.c     | 13 +++++++++++++
 fs/bcachefs/btree_key_cache.c | 14 ++++++++++++++
 2 files changed, 27 insertions(+)

diff --git a/fs/bcachefs/btree_cache.c b/fs/bcachefs/btree_cache.c
index 47e7770d0583..aab279dff944 100644
--- a/fs/bcachefs/btree_cache.c
+++ b/fs/bcachefs/btree_cache.c
@@ -13,6 +13,7 @@
 
 #include <linux/prefetch.h>
 #include <linux/sched/mm.h>
+#include <linux/seq_buf.h>
 
 const char * const bch2_btree_node_flags[] = {
 #define x(f)	#f,
@@ -392,6 +393,17 @@ static unsigned long bch2_btree_cache_count(struct shrinker *shrink,
 	return btree_cache_can_free(bc);
 }
 
+static void bch2_btree_cache_shrinker_to_text(struct seq_buf *s, struct shrinker *shrink)
+{
+	struct bch_fs *c = shrink->private_data;
+	char *cbuf;
+	size_t buflen = seq_buf_get_buf(s, &cbuf);
+	struct printbuf out = PRINTBUF_EXTERN(cbuf, buflen);
+
+	bch2_btree_cache_to_text(&out, c);
+	seq_buf_commit(s, out.pos);
+}
+
 void bch2_fs_btree_cache_exit(struct bch_fs *c)
 {
 	struct btree_cache *bc = &c->btree_cache;
@@ -478,6 +490,7 @@ int bch2_fs_btree_cache_init(struct bch_fs *c)
 	bc->shrink = shrink;
 	shrink->count_objects	= bch2_btree_cache_count;
 	shrink->scan_objects	= bch2_btree_cache_scan;
+	shrink->to_text		= bch2_btree_cache_shrinker_to_text;
 	shrink->seeks		= 4;
 	shrink->private_data	= c;
 	shrinker_register(shrink);
diff --git a/fs/bcachefs/btree_key_cache.c b/fs/bcachefs/btree_key_cache.c
index 4402cf068c56..e14e9b4cd029 100644
--- a/fs/bcachefs/btree_key_cache.c
+++ b/fs/bcachefs/btree_key_cache.c
@@ -13,6 +13,7 @@
 #include "trace.h"
 
 #include <linux/sched/mm.h>
+#include <linux/seq_buf.h>
 
 static inline bool btree_uses_pcpu_readers(enum btree_id id)
 {
@@ -1028,6 +1029,18 @@ void bch2_fs_btree_key_cache_init_early(struct btree_key_cache *c)
 	INIT_LIST_HEAD(&c->freed_nonpcpu);
 }
 
+static void bch2_btree_key_cache_shrinker_to_text(struct seq_buf *s, struct shrinker *shrink)
+{
+	struct bch_fs *c = shrink->private_data;
+	struct btree_key_cache *bc = &c->btree_key_cache;
+	char *cbuf;
+	size_t buflen = seq_buf_get_buf(s, &cbuf);
+	struct printbuf out = PRINTBUF_EXTERN(cbuf, buflen);
+
+	bch2_btree_key_cache_to_text(&out, bc);
+	seq_buf_commit(s, out.pos);
+}
+
 int bch2_fs_btree_key_cache_init(struct btree_key_cache *bc)
 {
 	struct bch_fs *c = container_of(bc, struct bch_fs, btree_key_cache);
@@ -1051,6 +1064,7 @@ int bch2_fs_btree_key_cache_init(struct btree_key_cache *bc)
 	shrink->seeks		= 0;
 	shrink->count_objects	= bch2_btree_key_cache_count;
 	shrink->scan_objects	= bch2_btree_key_cache_scan;
+	shrink->to_text		= bch2_btree_key_cache_shrinker_to_text;
 	shrink->private_data	= c;
 	shrinker_register(shrink);
 	return 0;
-- 
2.42.0