From: npiggin@kernel.dk
To: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
npiggin@kernel.dk
Subject: [patch 11/14] fs: icache factor hash lock into functions
Date: Fri, 22 Oct 2010 00:08:40 +1100 [thread overview]
Message-ID: <20101021131017.066884583@kernel.dk> (raw)
In-Reply-To: 20101021130829.442910807@kernel.dk
[-- Attachment #1: fs-inode_lock-scale-8.patch --]
[-- Type: text/plain, Size: 2806 bytes --]
Add a function __remove_inode_hash
Signed-off-by: Nick Piggin <npiggin@kernel.dk>
---
fs/inode.c | 38 ++++++++++++++++++++++++--------------
1 file changed, 24 insertions(+), 14 deletions(-)
Index: linux-2.6/fs/inode.c
===================================================================
--- linux-2.6.orig/fs/inode.c 2010-10-21 23:50:27.000000000 +1100
+++ linux-2.6/fs/inode.c 2010-10-21 23:50:41.000000000 +1100
@@ -432,6 +432,8 @@ static void evict(struct inode *inode)
cd_forget(inode);
}
+static void __remove_inode_hash(struct inode *inode);
+
/*
* dispose_list - dispose of the contents of a local list
* @head: the head of the list to free
@@ -453,9 +455,7 @@ static void dispose_list(struct list_hea
evict(inode);
spin_lock(&inode->i_lock);
- spin_lock(&inode_hash_lock);
- hlist_del_init(&inode->i_hash);
- spin_unlock(&inode_hash_lock);
+ __remove_inode_hash(inode);
spin_lock(&sb_inode_list_lock);
list_del_init(&inode->i_sb_list);
spin_unlock(&sb_inode_list_lock);
@@ -1380,6 +1380,20 @@ void __insert_inode_hash(struct inode *i
EXPORT_SYMBOL(__insert_inode_hash);
/**
+ * __remove_inode_hash - remove an inode from the hash
+ * @inode: inode to unhash
+ *
+ * Remove an inode from the superblock. inode->i_lock must be
+ * held.
+ */
+static void __remove_inode_hash(struct inode *inode)
+{
+ spin_lock(&inode_hash_lock);
+ hlist_del_init(&inode->i_hash);
+ spin_unlock(&inode_hash_lock);
+}
+
+/**
* remove_inode_hash - remove an inode from the hash
* @inode: inode to unhash
*
@@ -1388,9 +1402,7 @@ EXPORT_SYMBOL(__insert_inode_hash);
void remove_inode_hash(struct inode *inode)
{
spin_lock(&inode->i_lock);
- spin_lock(&inode_hash_lock);
- hlist_del_init(&inode->i_hash);
- spin_unlock(&inode_hash_lock);
+ __remove_inode_hash(inode);
spin_unlock(&inode->i_lock);
}
EXPORT_SYMBOL(remove_inode_hash);
@@ -1452,9 +1464,7 @@ static void iput_final(struct inode *ino
WARN_ON(inode->i_state & I_NEW);
inode->i_state &= ~I_WILL_FREE;
atomic_dec(&nr_unused);
- spin_lock(&inode_hash_lock);
- hlist_del_init(&inode->i_hash);
- spin_unlock(&inode_hash_lock);
+ __remove_inode_hash(inode);
}
spin_lock(&wb_inode_list_lock);
list_del_init(&inode->i_list);
@@ -1467,11 +1477,11 @@ static void iput_final(struct inode *ino
atomic_dec(&nr_inodes);
spin_unlock(&inode->i_lock);
evict(inode);
- spin_lock(&inode->i_lock);
- spin_lock(&inode_hash_lock);
- hlist_del_init(&inode->i_hash);
- spin_unlock(&inode_hash_lock);
- spin_unlock(&inode->i_lock);
+ /*
+ * i_lock is required to delete from hash because find_inode_fast
+ * might find us but go to sleep before we run wake_up_inode.
+ */
+ remove_inode_hash(inode);
wake_up_inode(inode);
BUG_ON(inode->i_state != (I_FREEING | I_CLEAR));
destroy_inode(inode);
next prev parent reply other threads:[~2010-10-21 13:25 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-21 13:08 [patch 00/14] reworked minimal inode_lock breaking series npiggin
2010-10-21 13:08 ` [patch 01/14] fs: icache begin inode_lock lock breaking npiggin
2010-10-21 13:08 ` [patch 02/14] fs: icache lock i_count npiggin
2010-10-21 13:08 ` [patch 03/14] fs: icache lock inodes icache state npiggin
2010-10-21 13:08 ` [patch 04/14] fs: icache unmount code cleanup npiggin
2010-10-21 13:08 ` [patch 05/14] fs: icache lock s_inodes list npiggin
2010-10-21 13:08 ` [patch 06/14] fs: icache lock inode hash npiggin
2010-10-21 13:08 ` [patch 07/14] fs: icache lock lru/writeback lists npiggin
2010-10-21 13:08 ` [patch 08/14] fs: icache make nr_inodes and nr_unused atomic npiggin
2010-10-21 13:08 ` [patch 09/14] fs: inode atomic last_ino, iunique lock npiggin
2010-10-21 13:08 ` [patch 10/14] fs: icache remove inode_lock npiggin
2010-10-21 13:08 ` npiggin [this message]
2010-10-21 13:08 ` [patch 12/14] fs: icache lazy inode lru npiggin
2010-10-21 13:08 ` [patch 13/14] fs: icache split IO and LRU lists npiggin
2010-10-21 15:28 ` Christoph Lameter
2010-10-22 0:00 ` Nick Piggin
2010-10-22 1:05 ` Nick Piggin
2010-10-21 13:08 ` [patch 14/14] fs: icache split writeback and lru locks npiggin
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