From: Christoph Hellwig <hch@infradead.org>
To: Yu Kuai <yukuai1@huaweicloud.com>
Cc: Christoph Hellwig <hch@infradead.org>,
axboe@kernel.dk, roger.pau@citrix.com, colyli@suse.de,
kent.overstreet@gmail.com, joern@lazybastard.org,
miquel.raynal@bootlin.com, richard@nod.at, vigneshr@ti.com,
sth@linux.ibm.com, hoeppner@linux.ibm.com, hca@linux.ibm.com,
gor@linux.ibm.com, agordeev@linux.ibm.com, jejb@linux.ibm.com,
martin.petersen@oracle.com, clm@fb.com, josef@toxicpanda.com,
dsterba@suse.com, nico@fluxnic.net, xiang@kernel.org,
chao@kernel.org, tytso@mit.edu, adilger.kernel@dilger.ca,
agruenba@redhat.com, jack@suse.com, konishi.ryusuke@gmail.com,
willy@infradead.org, akpm@linux-foundation.org, hare@suse.de,
p.raghav@samsung.com, linux-block@vger.kernel.org,
linux-kernel@vger.kernel.org, xen-devel@lists.xenproject.org,
linux-bcache@vger.kernel.org, linux-mtd@lists.infradead.org,
linux-s390@vger.kernel.org, linux-scsi@vger.kernel.org,
linux-bcachefs@vger.kernel.org, linux-btrfs@vger.kernel.org,
linux-erofs@lists.ozlabs.org, linux-ext4@vger.kernel.org,
gfs2@lists.linux.dev, linux-nilfs@vger.kernel.org,
yi.zhang@huawei.com, yangerkun@huawei.com,
"yukuai (C)" <yukuai3@huawei.com>
Subject: Re: [PATCH -next RFC 01/14] block: add some bdev apis
Date: Tue, 5 Dec 2023 23:20:26 -0800 [thread overview]
Message-ID: <ZXAgut2MTKw50OLI@infradead.org> (raw)
In-Reply-To: <aafabc6e-fd98-f927-44d7-3ef76e2acaf8@huaweicloud.com>
On Wed, Dec 06, 2023 at 02:50:56PM +0800, Yu Kuai wrote:
> I'm a litter confused, so there are 3 use cases:
> 1) use GFP_USER, default gfp from bdev_alloc.
> 2) use GFP_KERNEL
> 3) use GFP_NOFS
>
> I understand that you're suggesting memalloc_nofs_save() to distinguish
> 2 and 3, but how can I distinguish 1?
You shouldn't. Diverging from the default flags except for clearing
the FS or IO flags is simply a bug. Note that things like block2mtd
should probably also ensure a noio allocation if they aren't doing that
yet.
> > - use memalloc_nofs_save in extet instead of using
> > mapping_gfp_constraint to clear it from the mapping flags
> > - remove __ext4_sb_bread_gfp and just have buffer.c helper that does
> > the right thing (either by changing the calling conventions of an
> > existing one, or adding a new one).
>
> Thanks for the suggestions, but I'm not sure how to do this yet, I must
> read more ext4 code.
the nofs save part should be trivial. You can just skip the rest for
now as it's not needed for this patch series.
next prev parent reply other threads:[~2023-12-06 7:21 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-12-05 12:37 [PATCH -next RFC 00/14] block: don't access bd_inode directly from other modules Yu Kuai
2023-12-05 12:37 ` [PATCH -next RFC 01/14] block: add some bdev apis Yu Kuai
2023-12-05 17:03 ` Bart Van Assche
2023-12-06 6:14 ` Christoph Hellwig
2023-12-06 6:50 ` Yu Kuai
2023-12-06 7:20 ` Christoph Hellwig [this message]
2023-12-06 17:50 ` Theodore Ts'o
2023-12-06 17:57 ` Christoph Hellwig
2023-12-06 14:58 ` Matthew Wilcox
2023-12-07 2:45 ` Yu Kuai
2023-12-05 12:37 ` [PATCH -next RFC 02/14] xen/blkback: use bdev api in xen_update_blkif_status() Yu Kuai
2023-12-06 5:55 ` Christoph Hellwig
2023-12-06 6:56 ` Yu Kuai
2023-12-06 7:21 ` Christoph Hellwig
2023-12-05 12:37 ` [PATCH -next RFC 03/14] bcache: use bdev api in read_super() Yu Kuai
2023-12-05 12:37 ` [PATCH -next RFC 04/14] mtd: block2mtd: use bdev apis Yu Kuai
2023-12-05 12:37 ` [PATCH -next RFC 05/14] s390/dasd: use bdev api in dasd_format() Yu Kuai
2023-12-05 12:37 ` [PATCH -next RFC 06/14] scsicam: use bdev api in scsi_bios_ptable() Yu Kuai
2023-12-05 12:37 ` [PATCH -next RFC 07/14] bcachefs: remove dead function bdev_sectors() Yu Kuai
2023-12-05 12:37 ` [PATCH -next RFC 08/14] btrfs: use bdev apis Yu Kuai
2023-12-05 12:37 ` [PATCH -next RFC 09/14] cramfs: use bdev apis in cramfs_blkdev_read() Yu Kuai
2023-12-05 12:37 ` [PATCH -next RFC 10/14] erofs: use bdev api Yu Kuai
2023-12-05 12:37 ` [PATCH -next RFC 11/14] ext4: use bdev apis Yu Kuai
2023-12-05 12:38 ` [PATCH -next RFC 12/14] jbd2: " Yu Kuai
2023-12-05 12:39 ` [PATCH -next RFC 13/14] gfs2: use bdev api Yu Kuai
2023-12-05 12:39 ` [PATCH -next RFC 14/14] nilfs2: use bdev api in nilfs_attach_log_writer() Yu Kuai
2023-12-06 5:54 ` [PATCH -next RFC 00/14] block: don't access bd_inode directly from other modules Christoph Hellwig
2023-12-06 6:06 ` Yu Kuai
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