linux-ext4 - [PATCH 2/5] mbcache: don't BUG() if entry cache cannot be allocated

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Date:   Sat, 26 Nov 2016 22:17:58 -0800
From:   Eric Biggers <ebiggers@...gle.com>
To:     linux-ext4@...r.kernel.org
Cc:     Jan Kara <jack@...e.cz>, Andreas Gruenbacher <agruenba@...hat.com>,
        Eric Biggers <ebiggers@...gle.com>
Subject: [PATCH 2/5] mbcache: don't BUG() if entry cache cannot be allocated

mbcache can be a module that is loaded long after startup, when someone
asks to mount an ext2 or ext4 filesystem.  Therefore it should not BUG()
if kmem_cache_create() fails, but rather just fail the module load.

Signed-off-by: Eric Biggers <ebiggers@...gle.com>
---
 fs/mbcache.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/mbcache.c b/fs/mbcache.c
index 31e54c2..c56ab21 100644
--- a/fs/mbcache.c
+++ b/fs/mbcache.c
@@ -420,7 +420,8 @@ static int __init mbcache_init(void)
 	mb_entry_cache = kmem_cache_create("mbcache",
 				sizeof(struct mb_cache_entry), 0,
 				SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, NULL);
-	BUG_ON(!mb_entry_cache);
+	if (!mb_entry_cache)
+		return -ENOMEM;
 	return 0;
 }
 
-- 
2.8.0.rc3.226.g39d4020

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