From: Matthew Wilcox <willy@infradead.org>
To: Luis Chamberlain <mcgrof@kernel.org>
Cc: hughd@google.com, akpm@linux-foundation.org, brauner@kernel.org,
djwong@kernel.org, p.raghav@samsung.com, da.gomez@samsung.com,
a.manzanares@samsung.com, dave@stgolabs.net,
yosryahmed@google.com, keescook@chromium.org, hare@suse.de,
kbusch@kernel.org, patches@lists.linux.dev,
linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [RFC 4/8] shmem: add helpers to get block size
Date: Fri, 21 Apr 2023 23:49:43 +0100 [thread overview]
Message-ID: <ZEMTB4uKgKJKQRHo@casper.infradead.org> (raw)
In-Reply-To: <20230421214400.2836131-5-mcgrof@kernel.org>
On Fri, Apr 21, 2023 at 02:43:56PM -0700, Luis Chamberlain wrote:
> struct shmem_sb_info {
> +#ifdef CONFIG_TMPFS
> + u64 blocksize;
> +#endif
u64? You're planning on supporting a blocksize larger than 2GB?
I would store block_order (in an unsigned char) and then you can avoid
the call to ffs(), at the expense of doing 1UL << sbi->block_order;
next prev parent reply other threads:[~2023-04-21 22:50 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-04-21 21:43 [RFC 0/8] shmem: add support for blocksize > PAGE_SIZE Luis Chamberlain
2023-04-21 21:43 ` [RFC 1/8] shmem: replace BLOCKS_PER_PAGE with PAGE_SECTORS Luis Chamberlain
2023-04-21 21:43 ` [RFC 2/8] shmem: convert to use folio_test_hwpoison() Luis Chamberlain
2023-04-21 22:42 ` Matthew Wilcox
2023-04-22 3:05 ` Luis Chamberlain
2023-04-24 21:17 ` Yang Shi
2023-04-24 21:36 ` Matthew Wilcox
2023-04-24 23:05 ` Yang Shi
[not found] ` <CGME20230425110913eucas1p22cf9d4c7401881999adb12134b985273@eucas1p2.samsung.com>
2023-04-25 11:00 ` Pankaj Raghav
2023-04-25 22:47 ` Luis Chamberlain
2023-04-26 7:43 ` Luis Chamberlain
2023-04-21 21:43 ` [RFC 3/8] shmem: account for high order folios Luis Chamberlain
2023-04-21 22:46 ` Matthew Wilcox
2023-04-21 21:43 ` [RFC 4/8] shmem: add helpers to get block size Luis Chamberlain
2023-04-21 22:49 ` Matthew Wilcox [this message]
2023-04-21 21:43 ` [RFC 5/8] shmem: account for larger blocks sizes for shmem_default_max_blocks() Luis Chamberlain
2023-04-21 21:43 ` [RFC 6/8] shmem: consider block size in shmem_default_max_inodes() Luis Chamberlain
2023-04-21 21:43 ` [RFC 7/8] shmem: add high order page support Luis Chamberlain
2023-04-21 21:44 ` [RFC 8/8] shmem: add support to customize block size on multiple PAGE_SIZE Luis Chamberlain
2023-04-22 5:10 ` Jane Chu
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