linux-kernel - Re: [PATCH] ext4:fix unexpected error from ext4_reserve

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Message-Id: <1181950884.3808.16.camel@dyn9047017103.beaverton.ibm.com>
Date:	Fri, 15 Jun 2007 16:41:24 -0700
From:	Mingming Cao <cmm@...ibm.com>
To:	Dmitriy Monakhov <dmonakhov@...nvz.org>
Cc:	linux-kernel@...r.kernel.org, linux-ext4@...r.kernel.org
Subject: Re: [PATCH] ext4:fix unexpected error from ext4_reserve_global


On Thu, 2007-06-14 at 19:29 +0400, Dmitriy Monakhov wrote:
> I just cant belive my eyes then i saw this at the first time...
> simple test: strace dd if=/dev/zero of=/mnt/file
> 
Thanks for reporting it. 

> open("/dev/zero", O_RDONLY)             = 0
> close(1)                                = 0
> open("/mnt/test/file", O_WRONLY|O_CREAT|O_TRUNC, 0666) = 1
> read(0, "\0\0\0\0\0\0\0\0\0"..., 512) = 512
> write(1, "\0\0\0\0\0\0\0\0"..., 512) = 512
> read(0, "\0\0\0\0\0\0\0\0\0"..., 512) = 512
> write(1, "\0\0\0\0\0\0\0\0"..., 512) = -1 ENOENT (No such fil
> e or directory)
> 
> This strange error returned from ext4_reserve_global().
> It's just typo because:
> a) In fact this is 100% ENOSPC situation
> b) simular function ext4_reserve_local() returns -ENOSPC
> 
I agree.

Patch is put in ext4 patch queue. Alex if you can Ack, that would be
great.


Thanks,

Mingming
> Signed-off-by: Dmitriy Monakhov <dmonakhov@...nvz.org>
> ---
>  fs/ext4/balloc.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c
> index 4d7bfd2..43ae8f8 100644
> --- a/fs/ext4/balloc.c
> +++ b/fs/ext4/balloc.c
> @@ -1920,7 +1920,7 @@ int ext4_reserve_global(struct super_block *sb, int blocks)
>  {
>  	struct ext4_sb_info *sbi = EXT4_SB(sb);
>  	struct ext4_reservation_slot *rs;
> -	int i, rc = -ENOENT;
> +	int i, rc = -ENOSPC;
>  	__u64 free = 0;
> 
>  	rs = sbi->s_reservation_slots;

-
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