linux-kernel - [PATCH 5.15 255/913] nfsd: more robust allocation failure handling in nfsd_file_cache

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Message-Id: <20220405070347.499400402@linuxfoundation.org>
Date:   Tue,  5 Apr 2022 09:21:57 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jeff Layton <jlayton@...nel.org>,
        Amir Goldstein <amir73il@...il.com>,
        Chuck Lever <chuck.lever@...cle.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.15 255/913] nfsd: more robust allocation failure handling in nfsd_file_cache_init

From: Amir Goldstein <amir73il@...il.com>

[ Upstream commit 4d2eeafecd6c83b4444db3dc0ada201c89b1aa44 ]

The nfsd file cache table can be pretty large and its allocation
may require as many as 80 contigious pages.

Employ the same fix that was employed for similar issue that was
reported for the reply cache hash table allocation several years ago
by commit 8f97514b423a ("nfsd: more robust allocation failure handling
in nfsd_reply_cache_init").

Fixes: 65294c1f2c5e ("nfsd: add a new struct file caching facility to nfsd")
Link: https://lore.kernel.org/linux-nfs/e3cdaeec85a6cfec980e87fc294327c0381c1778.camel@kernel.org/
Suggested-by: Jeff Layton <jlayton@...nel.org>
Signed-off-by: Amir Goldstein <amir73il@...il.com>
Reviewed-by: Jeff Layton <jlayton@...nel.org>
Signed-off-by: Chuck Lever <chuck.lever@...cle.com>
Tested-by: Amir Goldstein <amir73il@...il.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/nfsd/filecache.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/fs/nfsd/filecache.c b/fs/nfsd/filecache.c
index be3c1aad50ea..7e23c588f484 100644
--- a/fs/nfsd/filecache.c
+++ b/fs/nfsd/filecache.c
@@ -641,7 +641,7 @@ nfsd_file_cache_init(void)
 	if (!nfsd_filecache_wq)
 		goto out;
 
-	nfsd_file_hashtbl = kcalloc(NFSD_FILE_HASH_SIZE,
+	nfsd_file_hashtbl = kvcalloc(NFSD_FILE_HASH_SIZE,
 				sizeof(*nfsd_file_hashtbl), GFP_KERNEL);
 	if (!nfsd_file_hashtbl) {
 		pr_err("nfsd: unable to allocate nfsd_file_hashtbl\n");
@@ -709,7 +709,7 @@ nfsd_file_cache_init(void)
 	nfsd_file_slab = NULL;
 	kmem_cache_destroy(nfsd_file_mark_slab);
 	nfsd_file_mark_slab = NULL;
-	kfree(nfsd_file_hashtbl);
+	kvfree(nfsd_file_hashtbl);
 	nfsd_file_hashtbl = NULL;
 	destroy_workqueue(nfsd_filecache_wq);
 	nfsd_filecache_wq = NULL;
@@ -855,7 +855,7 @@ nfsd_file_cache_shutdown(void)
 	fsnotify_wait_marks_destroyed();
 	kmem_cache_destroy(nfsd_file_mark_slab);
 	nfsd_file_mark_slab = NULL;
-	kfree(nfsd_file_hashtbl);
+	kvfree(nfsd_file_hashtbl);
 	nfsd_file_hashtbl = NULL;
 	destroy_workqueue(nfsd_filecache_wq);
 	nfsd_filecache_wq = NULL;
-- 
2.34.1