On 05/13/2010 01:00 PM, Jiaying Zhang Wrote:
> This patch issues discard request for freed blocks in ext4_free_blocks()
> if ext4 is mounted with discard option and without journal.
>
> Author: Jiaying Zhang <jiayingz@xxxxxxxxxx>
> Date: Wed May 12 21:11:46 2010 -0700
>
> Issue discard request in ext4_free_blocks() when ext4 has no journal and
> is mounted with discard option.
>
> Signed-off-by: Jiaying Zhang <jiayingz@xxxxxxxxxx>
>
> diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
> index a291cc3..d51b79a 100644
> --- a/fs/ext4/mballoc.c
> +++ b/fs/ext4/mballoc.c
> @@ -2513,6 +2513,22 @@ int ext4_mb_release(struct super_block *sb)
> return 0;
> }
>
> +static void ext4_issue_discard(struct super_block *sb, ext4_group_t block_group,
> + ext4_grpblk_t block, int count)
> +{
> + int ret;
> + ext4_fsblk_t discard_block;
> +
> + discard_block = block + ext4_group_first_block_no(sb, block_group);
> + trace_ext4_discard_blocks(sb,
> + (unsigned long long) discard_block, count);
> + ret = sb_issue_discard(sb, discard_block, count);
> + if (ret == EOPNOTSUPP) {
> + ext4_warning(sb, "discard not supported, disabling");
> + clear_opt(EXT4_SB(sb)->s_mount_opt, DISCARD);
> + }
> +}
> +
How about make it as an inline routine? Thanks.
--
Coly Li
SuSE Labs
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