linux-ext4 - [PATCH 18/23] cache: support channging flags

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Message-ID: <176246795890.2864310.7871055253361068028.stgit@frogsfrogsfrogs>
Date: Thu, 06 Nov 2025 14:47:51 -0800
From: "Darrick J. Wong" <djwong@...nel.org>
To: tytso@....edu
Cc: linux-ext4@...r.kernel.org
Subject: [PATCH 18/23] cache: support channging flags

From: Darrick J. Wong <djwong@...nel.org>

Make it so that we can change the flags in use by a given cache.

Signed-off-by: "Darrick J. Wong" <djwong@...nel.org>
---
 lib/support/cache.h |    4 ++++
 lib/support/cache.c |   18 ++++++++++++++++++
 2 files changed, 22 insertions(+)


diff --git a/lib/support/cache.h b/lib/support/cache.h
index 75e61c92a1fd35..32b99b5fe733e3 100644
--- a/lib/support/cache.h
+++ b/lib/support/cache.h
@@ -16,6 +16,8 @@
  */
 #define CACHE_MISCOMPARE_PURGE	(1 << 0)
 
+#define CACHE_FLAGS_ALL		(CACHE_MISCOMPARE_PURGE)
+
 /*
  * cache object campare return values
  */
@@ -145,6 +147,8 @@ void cache_purge(struct cache *);
 bool cache_flush(struct cache *cache);
 
 void cache_set_maxcount(struct cache *cache, unsigned int maxcount);
+int cache_set_flag(struct cache *cache, int flags);
+int cache_clear_flag(struct cache *cache, int flags);
 
 /* don't allocate a new node */
 #define CACHE_GET_INCORE	(1U << 0)
diff --git a/lib/support/cache.c b/lib/support/cache.c
index e2f9e722eb2ef1..99044248b85d38 100644
--- a/lib/support/cache.c
+++ b/lib/support/cache.c
@@ -97,6 +97,24 @@ cache_set_maxcount(
 	pthread_mutex_unlock(&cache->c_mutex);
 }
 
+int
+cache_set_flag(
+	struct cache		*cache,
+	int			flags)
+{
+	cache->c_flags |= (flags & CACHE_FLAGS_ALL);
+	return 0;
+}
+
+int
+cache_clear_flag(
+	struct cache		*cache,
+	int			flags)
+{
+	cache->c_flags &= ~flags;
+	return 0;
+}
+
 static void
 cache_expand(
 	struct cache *		cache)