linux-ext4 - Re: [PATCH v2] ext4: avoid redundant cache finding if flags not cantian PUNCH

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Date:	Mon, 27 Jun 2011 21:45:25 +0800
From:	Steven Liu <lingjiujianke@...il.com>
To:	Robin Dong <hao.bigrat@...il.com>
Cc:	linux-ext4@...r.kernel.org, Robin Dong <sanbai@...bao.com>
Subject: Re: [PATCH v2] ext4: avoid redundant cache finding if flags not
 cantian PUNCH_OUT

Hi Robin Dong

     Why don't modify this line?
   if ((flags & EXT4_GET_BLOCKS_CREATE) == 0) {
    if(!(flags & EXT4_GET_BLOCKS_CREATE))


2011/6/27 Robin Dong <hao.bigrat@...il.com>:
> In old code, ext4 will find extent in cache first even flags does
> not contian PUNCH_OUT, that may waste some time.
>
> Signed-off-by: Robin Dong <sanbai@...bao.com>
> Reviewed-by: Lukas Czerner <lczerner@...hat.com>
> ---
>  fs/ext4/extents.c |    4 ++--
>  1 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
> index eb63c7b..fed2633 100644
> --- a/fs/ext4/extents.c
> +++ b/fs/ext4/extents.c
> @@ -3358,8 +3358,8 @@ int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
>        trace_ext4_ext_map_blocks_enter(inode, map->m_lblk, map->m_len, flags);
>
>        /* check in cache */
> -       if (ext4_ext_in_cache(inode, map->m_lblk, &newex) &&
> -               ((flags & EXT4_GET_BLOCKS_PUNCH_OUT_EXT) == 0)) {
> +       if (!(flags & EXT4_GET_BLOCKS_PUNCH_OUT_EXT) &&
> +               ext4_ext_in_cache(inode, map->m_lblk, &newex)) {
>                if (!newex.ee_start_lo && !newex.ee_start_hi) {
>                        if ((flags & EXT4_GET_BLOCKS_CREATE) == 0) {
>                                /*
> --
> 1.7.1
>
> --
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Best Regards
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