From: Boaz Harrosh <bharrosh@panasas.com>
To: npiggin@kernel.dk
Cc: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org
Subject: Re: [patch 08/35] fs: icache lock i_count
Date: Tue, 19 Oct 2010 12:16:51 +0200 [thread overview]
Message-ID: <4CBD7013.1030709@panasas.com> (raw)
In-Reply-To: <20101019034656.303425354@kernel.dk>
On 10/19/2010 05:42 AM, npiggin@kernel.dk wrote:
> Protect inode->i_count with i_lock, rather than having it atomic.
>
> Signed-off-by: Nick Piggin <npiggin@kernel.dk>
>
> ---
<>
> fs/exofs/inode.c | 12 +++++++---
> fs/exofs/namei.c | 4 ++-
<>
> Index: linux-2.6/fs/exofs/inode.c
> ===================================================================
> --- linux-2.6.orig/fs/exofs/inode.c 2010-10-19 14:17:26.000000000 +1100
> +++ linux-2.6/fs/exofs/inode.c 2010-10-19 14:19:18.000000000 +1100
> @@ -1107,7 +1107,9 @@
>
Hi Nick, Please use -p option in your diff(s) it is a bit hard to follow
and review without the proper function context. These patches are on a git
tree. Why don't you use git to produce and send these patches?
> set_obj_created(oi);
>
> - atomic_dec(&inode->i_count);
> + spin_lock(&inode->i_lock);
> + inode->i_count--;
> + spin_unlock(&inode->i_lock);
I've queued up a patch in Linux-next that will conflict with this.
The patch uses iput() instead.
> wake_up(&oi->i_wq);
> }
>
> @@ -1160,14 +1162,18 @@
> /* increment the refcount so that the inode will still be around when we
> * reach the callback
> */
> - atomic_inc(&inode->i_count);
> + spin_lock(&inode->i_lock);
> + inode->i_count++;
> + spin_unlock(&inode->i_lock);
>
> ios->done = create_done;
> ios->private = inode;
> ios->cred = oi->i_cred;
> ret = exofs_sbi_create(ios);
> if (ret) {
> - atomic_dec(&inode->i_count);
> + spin_lock(&inode->i_lock);
> + inode->i_count--;
> + spin_unlock(&inode->i_lock);
Here too. (iput)
> exofs_put_io_state(ios);
> return ERR_PTR(ret);
> }
> Index: linux-2.6/fs/exofs/namei.c
> ===================================================================
> --- linux-2.6.orig/fs/exofs/namei.c 2010-10-19 14:17:26.000000000 +1100
> +++ linux-2.6/fs/exofs/namei.c 2010-10-19 14:19:18.000000000 +1100
> @@ -153,7 +153,9 @@
>
> inode->i_ctime = CURRENT_TIME;
> inode_inc_link_count(inode);
> - atomic_inc(&inode->i_count);
> + spin_lock(&inode->i_lock);
> + inode->i_count++;
All these will change to inode_get(), right?
> + spin_unlock(&inode->i_lock);
>
> return exofs_add_nondir(dentry, inode);
> }
Thanks
Boaz
next prev parent reply other threads:[~2010-10-19 10:16 UTC|newest]
Thread overview: 70+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-19 3:42 [patch 00/35] my inode scaling series for review npiggin
2010-10-19 3:42 ` [patch 01/35] bit_spinlock: add required includes npiggin
2010-10-19 3:42 ` [patch 02/35] kernel: add bl_list npiggin
2010-10-19 3:42 ` [patch 03/35] mm: implement per-zone shrinker npiggin
2010-10-19 4:49 ` KOSAKI Motohiro
2010-10-19 5:33 ` Nick Piggin
2010-10-19 5:40 ` KOSAKI Motohiro
2010-10-19 3:42 ` [patch 04/35] vfs: convert inode and dentry caches to " npiggin
2010-10-19 3:42 ` [patch 05/35] fs: icache lock s_inodes list npiggin
2010-10-19 3:42 ` [patch 06/35] fs: icache lock inode hash npiggin
2010-10-19 3:42 ` [patch 07/35] fs: icache lock i_state npiggin
2010-10-19 10:47 ` Miklos Szeredi
2010-10-19 17:06 ` Peter Zijlstra
2010-10-19 3:42 ` [patch 08/35] fs: icache lock i_count npiggin
2010-10-19 10:16 ` Boaz Harrosh [this message]
2010-10-20 2:14 ` Nick Piggin
2010-10-19 3:42 ` [patch 09/35] fs: icache lock lru/writeback lists npiggin
2010-10-19 3:42 ` [patch 10/35] fs: icache atomic inodes_stat npiggin
2010-10-19 3:42 ` [patch 11/35] fs: icache lock inode state npiggin
2010-10-19 3:42 ` [patch 12/35] fs: inode atomic last_ino, iunique lock npiggin
2010-10-19 3:42 ` [patch 13/35] fs: icache remove inode_lock npiggin
2010-10-19 3:42 ` [patch 14/35] fs: icache factor hash lock into functions npiggin
2010-10-19 3:42 ` [patch 15/35] fs: icache per-bucket inode hash locks npiggin
2010-10-19 3:42 ` [patch 16/35] fs: icache lazy inode lru npiggin
2010-10-19 3:42 ` [patch 17/35] fs: icache RCU free inodes npiggin
2010-10-19 3:42 ` [patch 18/35] fs: avoid inode RCU freeing for pseudo fs npiggin
2010-10-19 3:42 ` [patch 19/35] fs: icache remove redundant i_sb_list umount locking npiggin
2010-10-20 12:46 ` Al Viro
2010-10-20 13:03 ` Nick Piggin
2010-10-20 13:27 ` Al Viro
2010-10-19 3:42 ` [patch 20/35] fs: icache rcu walk for i_sb_list npiggin
2010-10-19 3:42 ` [patch 21/35] fs: icache per-cpu nr_inodes, non-atomic nr_unused counters npiggin
2010-10-19 3:42 ` [patch 22/35] fs: icache per-cpu last_ino allocator npiggin
2010-10-19 3:42 ` [patch 23/35] fs: icache use per-CPU lists and locks for sb inode lists npiggin
2010-10-19 15:33 ` Miklos Szeredi
2010-10-20 2:37 ` Nick Piggin
2010-10-19 3:42 ` [patch 24/35] fs: icache use RCU to avoid locking in hash lookups npiggin
2010-10-19 3:42 ` [patch 25/35] fs: icache reduce some locking overheads npiggin
2010-10-19 3:42 ` [patch 26/35] fs: icache alloc anonymous inode allocation npiggin
2010-10-19 15:50 ` Miklos Szeredi
2010-10-20 2:38 ` Nick Piggin
2010-10-19 16:33 ` Christoph Hellwig
2010-10-20 3:07 ` Nick Piggin
2010-10-19 3:42 ` [patch 27/35] fs: icache split IO and LRU lists npiggin
2010-10-19 16:12 ` Miklos Szeredi
2010-10-20 2:41 ` Nick Piggin
2010-10-19 3:42 ` [patch 28/35] fs: icache split writeback and lru locks npiggin
2010-10-19 3:42 ` [patch 29/35] fs: icache per-bdi writeback list locking npiggin
2010-10-19 3:42 ` [patch 30/35] fs: icache lazy LRU avoid LRU locking after IO operation npiggin
2010-10-19 3:42 ` [patch 31/35] fs: icache per-zone inode LRU npiggin
2010-10-19 12:38 ` Dave Chinner
2010-10-20 2:35 ` Nick Piggin
2010-10-20 3:12 ` Nick Piggin
2010-10-20 9:43 ` Dave Chinner
2010-10-20 10:02 ` Nick Piggin
2010-10-20 3:14 ` KOSAKI Motohiro
2010-10-20 3:20 ` Nick Piggin
2010-10-20 3:29 ` KOSAKI Motohiro
2010-10-20 10:19 ` Dave Chinner
2010-10-20 10:41 ` Nick Piggin
2010-10-19 3:42 ` [patch 32/35] fs: icache minimise I_FREEING latency npiggin
2010-10-19 3:42 ` [patch 33/35] fs: icache introduce inode_get/inode_get_ilock npiggin
2010-10-19 10:17 ` Boaz Harrosh
2010-10-20 2:17 ` Nick Piggin
2010-10-19 3:42 ` [patch 34/35] fs: inode rename i_count to i_refs npiggin
2010-10-19 3:42 ` [patch 35/35] fs: icache document more lock orders npiggin
2010-10-19 16:22 ` [patch 00/35] my inode scaling series for review Christoph Hellwig
2010-10-20 3:05 ` Nick Piggin
2010-10-20 13:14 ` Al Viro
2010-10-20 13:59 ` Nick Piggin
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