linux-ext4 - Re: [PATCH] e4defrag : Open the source file for e4defrag in read write mode to avoid failures from EXT4_IOC_EXT

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Date:	Tue, 19 Jan 2010 13:37:31 +0900
From:	Akira Fujita <a-fujita@...jp.nec.com>
To:	Manish Katiyar <mkatiyar@...il.com>
CC:	ext4 <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH] e4defrag : Open the source file for e4defrag in read
 write 	mode to avoid failures from EXT4_IOC_EXT_MOVE


Hi Manish,

(2010/01/19 13:21), Manish Katiyar wrote:
> Hi Akira,
> 
> I am consistently getting -EBADF while trying out e4defrag and it
> fails with below error.
> 
> /home/mkatiyar/e2fs-git/e2fsprogs/misc>  ./e4defrag -v /tmp/ohsm/mntdir/f1
> ext4 defragmentation for /tmp/ohsm/mntdir/f1
> [1/1]/tmp/ohsm/mntdir/f1:	  0%
> 	Failed to defrag:Bad file descriptor	[ NG ]
>   Success:			[0/1]
> 
> Below patch fixes the issue for me, though I am not sure if this is
> the right fix to open the source file in readwrite mode or fix the
> ext4 ioctl part.
> 

Patch looks good to me.
# I send same patch to Ted last month, but it is not on linux-ext4, sorry.

By commit 4a58579b9e4e2a35d57e6c9c8483e52f6f1b7fd6 of Linus' kernel tree,
rw mode check was added to EXT4_IOC_MOVE_EXTENT.
But command patch which corresponds to this change
has not been merged into e2fsprogs.
So this change is needed to run e4defrag command on current Linux kernel.

Regards,
Akira Fujita


> Open the source file in read write mode to avoid failures from EXT4_IOC_EXT_MOVE
> 
> Signed-off-by: Manish Katiyar<mkatiyar@...il.com>
> ---
>   misc/e4defrag.c |    2 +-
>   1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/misc/e4defrag.c b/misc/e4defrag.c
> index 82e3868..424e0ca 100644
> --- a/misc/e4defrag.c
> +++ b/misc/e4defrag.c
> @@ -1605,7 +1605,7 @@ static int file_defrag(const char *file, const
> struct stat64 *buf,
>   		return 0;
>   	}
> 
> -	fd = open64(file, O_RDONLY);
> +	fd = open64(file, O_RDWR);
>   	if (fd<  0) {
>   		if (mode_flag&  DETAIL) {
>   			PRINT_FILE_NAME(file);


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