linux-kernel - Re: [PATCH] trivial: inode uses a mutex instead of a semaphore.

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Date:	Mon, 10 May 2010 23:42:57 +0200 (CEST)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Thadeu Lima de Souza Cascardo <cascardo@...oscopio.com>
Cc:	linux-kernel@...r.kernel.org, Nick Piggin <npiggin@...e.de>,
	Artem Bityutskiy <Artem.Bityutskiy@...ia.com>,
	Randy Dunlap <rdunlap@...otime.net>,
	Christoph Hellwig <hch@....de>,
	Al Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH] trivial: inode uses a mutex instead of a semaphore.

On Tue, 27 Apr 2010, Thadeu Lima de Souza Cascardo wrote:

> Replace the introduced i_sem by an i_mutex in the filesystem locking
> documentation. This was introduced [1] after all occurrences were
> already replaced in the same text [2]. However, the term "inode
> semaphore" has not been replaced then, and it's replaced now.
> 
> [1] afddba49d18f346e5cc2938b6ed7c512db18ca68
> [2] a7bc02f4f47fd0e7860c6589f0ad000d1476f7a3
> 
> Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@...oscopio.com>
> Cc: Nick Piggin <npiggin@...e.de>
> Cc: Artem Bityutskiy <Artem.Bityutskiy@...ia.com>
> Cc: Randy Dunlap <rdunlap@...otime.net>
> Cc: Christoph Hellwig <hch@....de>
> Cc: Al Viro <viro@...iv.linux.org.uk>
> ---
>  Documentation/filesystems/Locking |    4 ++--
>  1 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/filesystems/Locking b/Documentation/filesystems/Locking
> index 06bbbed..af16080 100644
> --- a/Documentation/filesystems/Locking
> +++ b/Documentation/filesystems/Locking
> @@ -178,7 +178,7 @@ prototypes:
>  locking rules:
>  	All except set_page_dirty may block
>  
> -			BKL	PageLocked(page)	i_sem
> +			BKL	PageLocked(page)	i_mutex
>  writepage:		no	yes, unlocks (see below)
>  readpage:		no	yes, unlocks
>  sync_page:		no	maybe
> @@ -429,7 +429,7 @@ check_flags:		no
>  implementations.  If your fs is not using generic_file_llseek, you
>  need to acquire and release the appropriate locks in your ->llseek().
>  For many filesystems, it is probably safe to acquire the inode
> -semaphore.  Note some filesystems (i.e. remote ones) provide no
> +mutex.  Note some filesystems (i.e. remote ones) provide no
>  protection for i_size so you will need to use the BKL.
>  
>  Note: ext2_release() was *the* source of contention on fs-intensive

This doesn't seem to be present in linux-next as of today. I have applied 
the patch to trivial queue.

Thanks,

-- 
Jiri Kosina
SUSE Labs, Novell Inc.
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