From: Matthew Wilcox <willy@infradead.org>
To: David Howells <dhowells@redhat.com>
Cc: hch@lst.de, trond.myklebust@primarydata.com,
"Darrick J. Wong" <djwong@kernel.org>,
Ilya Dryomov <idryomov@gmail.com>,
Jeff Layton <jlayton@kernel.org>,
ceph-devel@vger.kernel.org, Steve French <sfrench@samba.org>,
linux-cifs@vger.kernel.org, linux-xfs@vger.kernel.org,
linux-fsdevel@vger.kernel.org, linux-mm@kvack.org,
darrick.wong@oracle.com, viro@zeniv.linux.org.uk,
torvalds@linux-foundation.org, linux-nfs@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3 2/9] mm: Add 'supports' field to the address_space_operations to list features
Date: Fri, 24 Sep 2021 21:10:00 +0100 [thread overview]
Message-ID: <YU4wmPyEoOZZfP3l@casper.infradead.org> (raw)
In-Reply-To: <163250389458.2330363.17234460134406104577.stgit@warthog.procyon.org.uk>
On Fri, Sep 24, 2021 at 06:18:14PM +0100, David Howells wrote:
> Rather than depending on .direct_IO to point to something to indicate that
> direct I/O is supported, add a 'supports' bitmask that we can test, since
> we only need one bit.
Why would you add mapping->aops->supports instead of using one of the free
bits in mapping->flags? enum mapping_flags in pagemap.h.
It could also be a per-fs flag, or per-sb flag, but it's fewer
dereferences at check time if it's in mapping->flags.
next prev parent reply other threads:[~2021-09-24 20:11 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-24 17:17 [RFC][PATCH v3 0/9] mm: Use DIO for swap and fix NFS swapfiles David Howells
2021-09-24 17:18 ` [PATCH v3 1/9] mm: Remove the callback func argument from __swap_writepage() David Howells
2021-09-24 17:18 ` [PATCH v3 2/9] mm: Add 'supports' field to the address_space_operations to list features David Howells
2021-09-24 20:10 ` Matthew Wilcox [this message]
2021-09-24 17:18 ` [PATCH v3 3/9] mm: Make swap_readpage() void David Howells
2021-09-24 22:07 ` Matthew Wilcox
2021-09-24 17:18 ` [PATCH v3 4/9] Introduce IOCB_SWAP kiocb flag to trigger REQ_SWAP David Howells
2021-09-26 21:56 ` Dave Chinner
2021-09-24 17:18 ` [PATCH v3 5/9] mm: Make swap_readpage() for SWP_FS_OPS use ->swap_rw() not ->readpage() David Howells
2021-09-24 17:18 ` [PATCH v3 6/9] mm: Make __swap_writepage() do async DIO if asked for it David Howells
2021-09-24 17:19 ` [PATCH v3 7/9] nfs: Fix write to swapfile failure due to generic_write_checks() David Howells
2021-09-24 17:19 ` [PATCH v3 8/9] block, btrfs, ext4, xfs: Implement swap_rw David Howells
2021-09-24 17:19 ` [PATCH v3 9/9] mm: Remove swap BIO paths and only use DIO paths David Howells
2021-09-25 14:56 ` Matthew Wilcox
2021-09-25 15:36 ` David Howells
2021-09-25 17:09 ` Matthew Wilcox
2021-09-26 23:08 ` Damien Le Moal
2021-09-27 1:25 ` Dave Chinner
2021-09-27 1:41 ` Damien Le Moal
2021-09-27 20:03 ` David Sterba
2021-09-25 23:42 ` [RFC][PATCH v3 0/9] mm: Use DIO for swap and fix NFS swapfiles Dave Chinner
2021-09-26 3:10 ` Matthew Wilcox
2021-09-26 22:36 ` Dave Chinner
2021-09-27 20:07 ` David Sterba
2021-09-28 3:11 ` NeilBrown
2021-09-30 15:54 ` Steve French
2021-09-29 15:45 ` David Howells
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