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Message-Id: <20240628062930.2467993-2-libaokun@huaweicloud.com>
Date: Fri, 28 Jun 2024 14:29:22 +0800
From: libaokun@...weicloud.com
To: netfs@...ts.linux.dev,
dhowells@...hat.com,
jlayton@...nel.org
Cc: hsiangkao@...ux.alibaba.com,
jefflexu@...ux.alibaba.com,
zhujia.zj@...edance.com,
linux-erofs@...ts.ozlabs.org,
brauner@...nel.org,
linux-fsdevel@...r.kernel.org,
linux-kernel@...r.kernel.org,
libaokun@...weicloud.com,
yangerkun@...wei.com,
houtao1@...wei.com,
yukuai3@...wei.com,
wozizhi@...wei.com,
Baokun Li <libaokun1@...wei.com>
Subject: [PATCH v3 1/9] netfs, fscache: export fscache_put_volume() and add fscache_try_get_volume()
From: Baokun Li <libaokun1@...wei.com>
Export fscache_put_volume() and add fscache_try_get_volume()
helper function to allow cachefiles to get/put fscache_volume
via linux/fscache-cache.h.
Signed-off-by: Baokun Li <libaokun1@...wei.com>
---
fs/netfs/fscache_volume.c | 14 ++++++++++++++
fs/netfs/internal.h | 2 --
include/linux/fscache-cache.h | 6 ++++++
3 files changed, 20 insertions(+), 2 deletions(-)
diff --git a/fs/netfs/fscache_volume.c b/fs/netfs/fscache_volume.c
index fbdc428aaea9..2e2a405ca9b0 100644
--- a/fs/netfs/fscache_volume.c
+++ b/fs/netfs/fscache_volume.c
@@ -27,6 +27,19 @@ struct fscache_volume *fscache_get_volume(struct fscache_volume *volume,
return volume;
}
+struct fscache_volume *fscache_try_get_volume(struct fscache_volume *volume,
+ enum fscache_volume_trace where)
+{
+ int ref;
+
+ if (!__refcount_inc_not_zero(&volume->ref, &ref))
+ return NULL;
+
+ trace_fscache_volume(volume->debug_id, ref + 1, where);
+ return volume;
+}
+EXPORT_SYMBOL(fscache_try_get_volume);
+
static void fscache_see_volume(struct fscache_volume *volume,
enum fscache_volume_trace where)
{
@@ -420,6 +433,7 @@ void fscache_put_volume(struct fscache_volume *volume,
fscache_free_volume(volume);
}
}
+EXPORT_SYMBOL(fscache_put_volume);
/*
* Relinquish a volume representation cookie.
diff --git a/fs/netfs/internal.h b/fs/netfs/internal.h
index 9e3e11234e0b..21e46bc9aa49 100644
--- a/fs/netfs/internal.h
+++ b/fs/netfs/internal.h
@@ -343,8 +343,6 @@ extern const struct seq_operations fscache_volumes_seq_ops;
struct fscache_volume *fscache_get_volume(struct fscache_volume *volume,
enum fscache_volume_trace where);
-void fscache_put_volume(struct fscache_volume *volume,
- enum fscache_volume_trace where);
bool fscache_begin_volume_access(struct fscache_volume *volume,
struct fscache_cookie *cookie,
enum fscache_access_trace why);
diff --git a/include/linux/fscache-cache.h b/include/linux/fscache-cache.h
index bdf7f3eddf0a..4c91a019972b 100644
--- a/include/linux/fscache-cache.h
+++ b/include/linux/fscache-cache.h
@@ -19,6 +19,7 @@
enum fscache_cache_trace;
enum fscache_cookie_trace;
enum fscache_access_trace;
+enum fscache_volume_trace;
enum fscache_cache_state {
FSCACHE_CACHE_IS_NOT_PRESENT, /* No cache is present for this name */
@@ -97,6 +98,11 @@ extern void fscache_withdraw_cookie(struct fscache_cookie *cookie);
extern void fscache_io_error(struct fscache_cache *cache);
+extern struct fscache_volume *
+fscache_try_get_volume(struct fscache_volume *volume,
+ enum fscache_volume_trace where);
+extern void fscache_put_volume(struct fscache_volume *volume,
+ enum fscache_volume_trace where);
extern void fscache_end_volume_access(struct fscache_volume *volume,
struct fscache_cookie *cookie,
enum fscache_access_trace why);
--
2.39.2
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