From patchwork Wed Dec 6 06:05:35 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dave Chinner X-Patchwork-Id: 13481034 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=fromorbit-com.20230601.gappssmtp.com header.i=@fromorbit-com.20230601.gappssmtp.com header.b="hP0bHWFJ" Received: from mail-io1-xd2f.google.com (mail-io1-xd2f.google.com [IPv6:2607:f8b0:4864:20::d2f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 30BF91A5 for ; Tue, 5 Dec 2023 22:06:35 -0800 (PST) Received: by mail-io1-xd2f.google.com with SMTP id ca18e2360f4ac-7b37dbf896eso353625739f.1 for ; Tue, 05 Dec 2023 22:06:35 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fromorbit-com.20230601.gappssmtp.com; s=20230601; t=1701842794; x=1702447594; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=wHSvpgHbJd6Eu7qsv8V2o7uK7jb6cBWSzdjaYC45cFQ=; b=hP0bHWFJK3CDWgHLZH+vVHpswe5I5mgw1LNhFoZUiTK3MyI+/heouNQ/zh6m6zyqDZ CJbH6hqpwV33+QX44UBROaWbOttoIlTNxv+OQgreCmZ2JgLKJkRzdr5QajqIagFA/d/6 VDz2VZCxtod7iSBiaLp/6CD24NgRV56eOvu8VeCPfeGe3I/s+Wx/7aMOOEny82mPe9mX ZbMo13HENl4dEHIq0KCtkfh9NX1vWaYqTIhfSapbyjLS/krHKDQdAnw4a8GHNj0OqwTq fbLV+Xf+KG3f1VdlOANs9ZWnpW1BbJxleDB3FMaJePnNqN9hi7EYu7+bgnS4/nFOt6R0 /8+w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1701842794; x=1702447594; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=wHSvpgHbJd6Eu7qsv8V2o7uK7jb6cBWSzdjaYC45cFQ=; b=Eht+36n2Ixf1OzfZbmv+g/rtqqTzhbLhfw7xJ+mdtCzGrBUk4TsAxqRqXBZ/PoG91h MT8Nlc/scghmVHrsrT0v4K7aGl4lm6m4eZOcQKc1gcV5xnttcmKVecGFdv4hEXdyT+Q9 At0yOoZ0Lm8rvUiP9nphQf3QP213A5PE/7POQCGWnOCrpHuMPmkmeSecfKo585rQQeya EOO+JrQnMUgIRUEP/yZfRYtZ8cP9h17CbFCgnM1FB3TT7MXMqr71yKve8LixCGmD2S6h U3PL80EqzIHBa+4ZphoQIPJ175T75vVKZVQVAEhMIBigw0/HFiFPRRTsSZzSz4JGQ8m8 BoXA== X-Gm-Message-State: AOJu0YwK7d6K7Ihla19U/w8Fv9cvOf0fXspNJgw0DJNWlT55s8jDwNeC HjELx35g267Xis6wAzjDYc4S5Q== X-Google-Smtp-Source: AGHT+IFyEkydutbRflbUebHhG6N121DmGV5SoFJedHB237+BvShkltfvd92qMh3rpX3+xBNwHz7Raw== X-Received: by 2002:a05:6e02:13e8:b0:35d:6a39:faeb with SMTP id w8-20020a056e0213e800b0035d6a39faebmr517082ilj.10.1701842794477; Tue, 05 Dec 2023 22:06:34 -0800 (PST) Received: from dread.disaster.area (pa49-180-125-5.pa.nsw.optusnet.com.au. [49.180.125.5]) by smtp.gmail.com with ESMTPSA id i123-20020a639d81000000b005c662e103a1sm6488754pgd.41.2023.12.05.22.06.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 05 Dec 2023 22:06:33 -0800 (PST) Received: from [192.168.253.23] (helo=devoid.disaster.area) by dread.disaster.area with esmtp (Exim 4.96) (envelope-from ) id 1rAl3I-004VOv-0L; Wed, 06 Dec 2023 17:06:31 +1100 Received: from dave by devoid.disaster.area with local (Exim 4.97-RC0) (envelope-from ) id 1rAl3H-0000000BrVQ-2oA0; Wed, 06 Dec 2023 17:06:31 +1100 From: Dave Chinner To: linux-fsdevel@vger.kernel.org Cc: linux-block@vger.kernel.org, linux-cachefs@redhat.com, dhowells@redhat.com, gfs2@lists.linux.dev, dm-devel@lists.linux.dev, linux-security-module@vger.kernel.org, selinux@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 06/11] vfs: factor out inode hash head calculation Date: Wed, 6 Dec 2023 17:05:35 +1100 Message-ID: <20231206060629.2827226-7-david@fromorbit.com> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231206060629.2827226-1-david@fromorbit.com> References: <20231206060629.2827226-1-david@fromorbit.com> Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Dave Chinner In preparation for changing the inode hash table implementation. Signed-off-by: Dave Chinner ACKed-by: Al Viro --- fs/inode.c | 44 +++++++++++++++++++++++++------------------- 1 file changed, 25 insertions(+), 19 deletions(-) diff --git a/fs/inode.c b/fs/inode.c index 3426691fa305..fead81550cf4 100644 --- a/fs/inode.c +++ b/fs/inode.c @@ -59,6 +59,22 @@ static unsigned int i_hash_shift __ro_after_init; static struct hlist_head *inode_hashtable __ro_after_init; static __cacheline_aligned_in_smp DEFINE_SPINLOCK(inode_hash_lock); +static unsigned long hash(struct super_block *sb, unsigned long hashval) +{ + unsigned long tmp; + + tmp = (hashval * (unsigned long)sb) ^ (GOLDEN_RATIO_PRIME + hashval) / + L1_CACHE_BYTES; + tmp = tmp ^ ((tmp ^ GOLDEN_RATIO_PRIME) >> i_hash_shift); + return tmp & i_hash_mask; +} + +static inline struct hlist_head *i_hash_head(struct super_block *sb, + unsigned int hashval) +{ + return inode_hashtable + hash(sb, hashval); +} + /* * Empty aops. Can be used for the cases where the user does not * define any of the address_space operations. @@ -502,16 +518,6 @@ static inline void inode_sb_list_del(struct inode *inode) dlock_lists_del(&inode->i_sb_list); } -static unsigned long hash(struct super_block *sb, unsigned long hashval) -{ - unsigned long tmp; - - tmp = (hashval * (unsigned long)sb) ^ (GOLDEN_RATIO_PRIME + hashval) / - L1_CACHE_BYTES; - tmp = tmp ^ ((tmp ^ GOLDEN_RATIO_PRIME) >> i_hash_shift); - return tmp & i_hash_mask; -} - /** * __insert_inode_hash - hash an inode * @inode: unhashed inode @@ -1187,7 +1193,7 @@ struct inode *inode_insert5(struct inode *inode, unsigned long hashval, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *data) { - struct hlist_head *head = inode_hashtable + hash(inode->i_sb, hashval); + struct hlist_head *head = i_hash_head(inode->i_sb, hashval); struct inode *old; again: @@ -1291,7 +1297,7 @@ EXPORT_SYMBOL(iget5_locked); */ struct inode *iget_locked(struct super_block *sb, unsigned long ino) { - struct hlist_head *head = inode_hashtable + hash(sb, ino); + struct hlist_head *head = i_hash_head(sb, ino); struct inode *inode; again: spin_lock(&inode_hash_lock); @@ -1359,7 +1365,7 @@ EXPORT_SYMBOL(iget_locked); */ static int test_inode_iunique(struct super_block *sb, unsigned long ino) { - struct hlist_head *b = inode_hashtable + hash(sb, ino); + struct hlist_head *b = i_hash_head(sb, ino); struct inode *inode; hlist_for_each_entry_rcu(inode, b, i_hash) { @@ -1446,7 +1452,7 @@ EXPORT_SYMBOL(igrab); struct inode *ilookup5_nowait(struct super_block *sb, unsigned long hashval, int (*test)(struct inode *, void *), void *data) { - struct hlist_head *head = inode_hashtable + hash(sb, hashval); + struct hlist_head *head = i_hash_head(sb, hashval); struct inode *inode; spin_lock(&inode_hash_lock); @@ -1501,7 +1507,7 @@ EXPORT_SYMBOL(ilookup5); */ struct inode *ilookup(struct super_block *sb, unsigned long ino) { - struct hlist_head *head = inode_hashtable + hash(sb, ino); + struct hlist_head *head = i_hash_head(sb, ino); struct inode *inode; again: spin_lock(&inode_hash_lock); @@ -1550,7 +1556,7 @@ struct inode *find_inode_nowait(struct super_block *sb, void *), void *data) { - struct hlist_head *head = inode_hashtable + hash(sb, hashval); + struct hlist_head *head = i_hash_head(sb, hashval); struct inode *inode, *ret_inode = NULL; int mval; @@ -1595,7 +1601,7 @@ EXPORT_SYMBOL(find_inode_nowait); struct inode *find_inode_rcu(struct super_block *sb, unsigned long hashval, int (*test)(struct inode *, void *), void *data) { - struct hlist_head *head = inode_hashtable + hash(sb, hashval); + struct hlist_head *head = i_hash_head(sb, hashval); struct inode *inode; RCU_LOCKDEP_WARN(!rcu_read_lock_held(), @@ -1633,7 +1639,7 @@ EXPORT_SYMBOL(find_inode_rcu); struct inode *find_inode_by_ino_rcu(struct super_block *sb, unsigned long ino) { - struct hlist_head *head = inode_hashtable + hash(sb, ino); + struct hlist_head *head = i_hash_head(sb, ino); struct inode *inode; RCU_LOCKDEP_WARN(!rcu_read_lock_held(), @@ -1653,7 +1659,7 @@ int insert_inode_locked(struct inode *inode) { struct super_block *sb = inode->i_sb; ino_t ino = inode->i_ino; - struct hlist_head *head = inode_hashtable + hash(sb, ino); + struct hlist_head *head = i_hash_head(sb, ino); while (1) { struct inode *old = NULL;