linux-ext4 - Re: [PATCH, RFC] ext4-use-generic-discard-reservations-call

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Message-Id: <1218755380.6362.43.camel@mingming-laptop>
Date:	Thu, 14 Aug 2008 16:09:40 -0700
From:	Mingming Cao <cmm@...ibm.com>
To:	"Theodore Ts'o" <tytso@....edu>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: [PATCH, RFC] ext4-use-generic-discard-reservations-call


在 2008-08-14四的 15:54 -0400，Theodore Ts'o写道：
> Does this patch make sense?  I noticed that in the extents version of
> the truncate, we call the mballoc-specific version of
> ext4_discard_reservation(), instead of ext4_discard_reservation()
> directly.  As a result, if the filesystem is mounted -o nomballoc, we
> won't throw away the reservation window when truncating or unlinking an
> extents-based file.   We are using ext4_discard_reservation() in
> non-extent truncate code, which is what made me notice this.
> 
> 	   	    	  	   	- Ted
> 

Agreed.

Reviewed-by: Mingming Cao <cmm@...ibm.com>

> ext4: Use ext4_discard_reservations instead of mballoc-specific call
> 
> In ext4_ext_truncate(), we should use the more generic
> ext4_discard_reservations() call so we do the right thing when the
> filesystem is mounted with the nomballoc option.
> 
> Signed-off-by: "Theodore Ts'o" <tytso@....edu>
> diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
> index 3c82ab1..30a59b8 100644
> --- a/fs/ext4/extents.c
> +++ b/fs/ext4/extents.c
> @@ -2963,7 +2963,7 @@ void ext4_ext_truncate(struct inode *inode)
>  	down_write(&EXT4_I(inode)->i_data_sem);
>  	ext4_ext_invalidate_cache(inode);
> 
> -	ext4_mb_discard_inode_preallocations(inode);
> +	ext4_discard_reservation(inode);
> 
>  	/*
>  	 * TODO: optimization is possible here.
> --
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