From: David Sterba <dsterba@suse.cz>
To: Qu Wenruo <quwenruo.btrfs@gmx.com>
Cc: David Sterba <dsterba@suse.com>, linux-btrfs@vger.kernel.org
Subject: Re: [PATCH 03/10] btrfs: replace s_blocksize_bits with fs_info::sectorsize_bits
Date: Mon, 2 Nov 2020 16:18:17 +0100 [thread overview]
Message-ID: <20201102151817.GF6756@twin.jikos.cz> (raw)
In-Reply-To: <8154edcf-f82f-1e1e-8313-433ff46d94c1@gmx.com>
On Mon, Nov 02, 2020 at 10:23:43PM +0800, Qu Wenruo wrote:
>
>
> On 2020/10/29 下午10:27, David Sterba wrote:
> > The value of super_block::s_blocksize_bits is the same as
> > fs_info::sectorsize_bits, but we don't need to do the extra dereferences
> > in many functions and storing the bits as u32 (in fs_info) generates
> > shorter assembly.
> >
> > Signed-off-by: David Sterba <dsterba@suse.com>
>
> This patch is great.
>
> I was just going to kill all "inode->i_sb->s_blocksize_bits" for subpage.
>
> Although for subpage case, we may populate sb->s_blocksize_bits to
> PAGE_SHIFT, as current subpage doesn't support real subpage write at all.
> Thus we want everything from DIO alignement to reflink alignment to
> still be PAGE_SIZE.
Yeah the different alignment constraints with subpage will be
interesting.
next prev parent reply other threads:[~2020-11-02 15:20 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-29 14:27 [PATCH 00/10] Sectorsize, csum_size lifted to fs_info David Sterba
2020-10-29 14:27 ` [PATCH 01/10] btrfs: use precalculated sectorsize_bits from fs_info David Sterba
2020-11-02 14:05 ` Qu Wenruo
2020-11-02 14:18 ` Qu Wenruo
2020-11-02 14:31 ` Johannes Thumshirn
2020-11-02 15:08 ` David Sterba
2020-11-02 15:12 ` Johannes Thumshirn
2020-11-02 15:15 ` David Sterba
2020-11-03 9:31 ` David Sterba
2020-10-29 14:27 ` [PATCH 02/10] btrfs: replace div_u64 by shift in free_space_bitmap_size David Sterba
2020-11-02 14:07 ` Qu Wenruo
2020-10-29 14:27 ` [PATCH 03/10] btrfs: replace s_blocksize_bits with fs_info::sectorsize_bits David Sterba
2020-11-02 14:23 ` Qu Wenruo
2020-11-02 15:18 ` David Sterba [this message]
2020-10-29 14:27 ` [PATCH 04/10] btrfs: store precalculated csum_size in fs_info David Sterba
2020-10-29 14:27 ` [PATCH 05/10] btrfs: precalculate checksums per leaf once David Sterba
2020-11-02 14:27 ` Qu Wenruo
2020-11-02 15:24 ` David Sterba
2020-11-02 16:00 ` David Sterba
2020-10-29 14:27 ` [PATCH 06/10] btrfs: use cached value of fs_info::csum_size everywhere David Sterba
2020-11-02 14:28 ` Qu Wenruo
2020-10-29 14:27 ` [PATCH 07/10] btrfs: switch cached fs_info::csum_size from u16 to u32 David Sterba
2020-10-29 14:27 ` [PATCH 08/10] btrfs: remove unnecessary local variables for checksum size David Sterba
2020-10-29 14:43 ` Johannes Thumshirn
2020-10-29 14:27 ` [PATCH 09/10] btrfs: check integrity: remove local copy of csum_size David Sterba
2020-10-29 14:44 ` Johannes Thumshirn
2020-10-29 14:27 ` [PATCH 10/10] btrfs: scrub: remove local copy of csum_size from context David Sterba
2020-10-29 14:45 ` Johannes Thumshirn
2020-10-29 14:54 ` David Sterba
2020-10-29 15:01 ` Johannes Thumshirn
2020-10-29 14:50 ` [PATCH 00/10] Sectorsize, csum_size lifted to fs_info Johannes Thumshirn
2020-10-29 16:25 ` David Sterba
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