Re: [PATCH 6/7] mke2fs: Use unix_discard() for discards

[Eric Sandeen <sandeen@redhat.com>]

On 10/26/10 12:54 PM, Lukas Czerner wrote:
> There is generic discard function in struct_io_manager, or in
> unix_io_manager to be specific. So use this instead of
> mke2fs_discard_blocks().
> 
> Since mke2fs_discard_blocks() is not used anymore (and should not be)
> remove it.

looks fine to me, though needs fixup for the ->discard args
if that changes.

> Signed-off-by: Lukas Czerner <lczerner@redhat.com>
> ---
>  misc/mke2fs.c |   50 +++++++++++---------------------------------------
>  1 files changed, 11 insertions(+), 39 deletions(-)
> 
> diff --git a/misc/mke2fs.c b/misc/mke2fs.c
> index 32e3a2b..09ce711 100644
> --- a/misc/mke2fs.c
> +++ b/misc/mke2fs.c
> @@ -1902,48 +1902,10 @@ static int mke2fs_setup_tdb(const char *name, io_manager *io_ptr)
>  
>  #ifdef __linux__
>  
> -#ifndef BLKDISCARD
> -#define BLKDISCARD	_IO(0x12,119)
> -#endif
> -
>  #ifndef BLKDISCARDZEROES
>  #define BLKDISCARDZEROES _IO(0x12,124)
>  #endif
>  
> -/*
> - * Return zero if the discard succeeds, and -1 if the discard fails.
> - */
> -static int mke2fs_discard_blocks(ext2_filsys fs)
> -{
> -	int fd;
> -	int ret;
> -	int blocksize;
> -	__u64 blocks;
> -	__uint64_t range[2];
> -
> -	blocks = ext2fs_blocks_count(fs->super);
> -	blocksize = EXT2_BLOCK_SIZE(fs->super);
> -	range[0] = 0;
> -	range[1] = blocks * blocksize;
> -
> -	fd = open64(fs->device_name, O_RDWR);
> -
> -	if (fd > 0) {
> -		ret = ioctl(fd, BLKDISCARD, &range);
> -		if (verbose) {
> -			printf(_("Calling BLKDISCARD from %llu to %llu "),
> -			       (unsigned long long) range[0],
> -			       (unsigned long long) range[1]);
> -			if (ret)
> -				printf(_("failed.\n"));
> -			else
> -				printf(_("succeeded.\n"));
> -		}
> -		close(fd);
> -	}
> -	return ret;
> -}
> -
>  static int mke2fs_discard_zeroes_data(ext2_filsys fs)
>  {
>  	int fd;
> @@ -2023,7 +1985,17 @@ int main (int argc, char *argv[])
>  
>  	/* Can't undo discard ... */
>  	if (discard && (io_ptr != undo_io_manager)) {
> -		retval = mke2fs_discard_blocks(fs);
> +		blk64_t blocks = ext2fs_blocks_count(fs->super);
> +		retval = io_ptr->discard(fs->io, 0, blocks, fs);
> +
> +		if (verbose) {
> +			printf(_("Calling BLKDISCARD from 0 to %llu "),
> +			       (unsigned long long) blocks);
> +			if (retval)
> +				printf(_("failed.\n"));
> +			else
> +				printf(_("succeeded.\n"));
> +		}
>  
>  		if (!retval && mke2fs_discard_zeroes_data(fs)) {
>  			if (verbose)