From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9B2C5154C04 for ; Thu, 19 Dec 2024 18:08:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734631697; cv=none; b=qZX78vXBoK7pI7uU7LAhKfmZpd7EuMXIPgKSwaM+RxCOmiwCNZp21GMCpGYKW/lYDTul9jDedIBtRvKcK9qhqtIluAcBHzgcL2ouzIRFR063g9nlVNx0jQro2AY9WVIw1UG3mahuQr5AdWuPD+jOVlO2uaKWuVRdkFdgvSyJvyY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734631697; c=relaxed/simple; bh=ztYIQdfW7PEh30BVwxBT9rqmn0K+TD+Ut/MQRVG9skk=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=Vgct/6iaLWxXEyDO6FZNCeCQalwAAnuN0z5pAcEvbwMfkqhkNZn+HJwlE9cPtV+R3pB+FFokGmL1F3qB0IuxZC46HvkQkO3jYaSolH9W/S+Xec757tspsSEfncrmQ+jeVIw9xV7GlGPUDDiu5fWfCB0iCGqbR6Y92EEZInsxTDM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=m6fXBd+2; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="m6fXBd+2" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 569A7C4CECE; Thu, 19 Dec 2024 18:08:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1734631697; bh=ztYIQdfW7PEh30BVwxBT9rqmn0K+TD+Ut/MQRVG9skk=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=m6fXBd+2Zv54ULW+6jYkP2yg44MYNO8N1y8oWCcZDLkhUTVyzF8Ad7t3yRw8IpsrK YFwTEIj+zS90/VnuX/aAIMywr4rneBRUDVCj5eaEzPvYxR3KQ5lC2kRy3o4lX4g1Ad qIHLljBcc6kG2rTAGRi5pr1WtBsV/cenwBS7GbuZTmgszXPpk23CIGvXBcXlbSgBDZ Hp6r2kgwJ1rrXNUoxiDJ+2vmM/irAUsniDgsfNk1sVaZL7r649SCHhdFRq5gw/RkI8 yH5BwjYTsE+3GlzzTnzjm4ZxNgNYWFaPPEuP1pwtrs5KXzNtla9Mp7Oltwqzwnt9es ZTqyi3vqYhn9w== Message-ID: Subject: Re: [PATCH v3 04/12] fuse: support large folios for writethrough writes From: Jeff Layton To: Joanne Koong , miklos@szeredi.hu, linux-fsdevel@vger.kernel.org Cc: josef@toxicpanda.com, bernd.schubert@fastmail.fm, willy@infradead.org, jefflexu@linux.alibaba.com, shakeel.butt@linux.dev, kernel-team@meta.com Date: Thu, 19 Dec 2024 13:08:15 -0500 In-Reply-To: <20241213221818.322371-5-joannelkoong@gmail.com> References: <20241213221818.322371-1-joannelkoong@gmail.com> <20241213221818.322371-5-joannelkoong@gmail.com> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv egyjnSsFt7EGoDjdKqr1TS9syJYFjagYtvWk/UfHlW09X+jOh4vYtfX7iYSx/NfqV3W1D7EDi0PqV 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Fri, 2024-12-13 at 14:18 -0800, Joanne Koong wrote: > Add support for folios larger than one page size for writethrough > writes. >=20 > Signed-off-by: Joanne Koong > --- > fs/fuse/file.c | 19 ++++++++++++------- > 1 file changed, 12 insertions(+), 7 deletions(-) >=20 > diff --git a/fs/fuse/file.c b/fs/fuse/file.c > index c041bb328203..84e39426862a 100644 > --- a/fs/fuse/file.c > +++ b/fs/fuse/file.c > @@ -1135,6 +1135,7 @@ static ssize_t fuse_fill_write_pages(struct fuse_io= _args *ia, > struct iov_iter *ii, loff_t pos, > unsigned int max_pages) > { > + size_t max_folio_size =3D mapping_max_folio_size(mapping); > struct fuse_args_pages *ap =3D &ia->ap; > struct fuse_conn *fc =3D get_fuse_conn(mapping->host); > unsigned offset =3D pos & (PAGE_SIZE - 1); > @@ -1146,17 +1147,17 @@ static ssize_t fuse_fill_write_pages(struct fuse_= io_args *ia, > num =3D min(num, max_pages << PAGE_SHIFT); > =20 > ap->args.in_pages =3D true; > - ap->descs[0].offset =3D offset; > =20 > while (num) { > size_t tmp; > struct folio *folio; > pgoff_t index =3D pos >> PAGE_SHIFT; > - unsigned int bytes =3D min(PAGE_SIZE - offset, num); > + unsigned int bytes; > + unsigned int folio_offset; > =20 > again: > err =3D -EFAULT; > - if (fault_in_iov_iter_readable(ii, bytes)) > + if (fault_in_iov_iter_readable(ii, max_folio_size) =3D=3D max_folio_si= ze) > break; > =20 > folio =3D __filemap_get_folio(mapping, index, FGP_WRITEBEGIN, > @@ -1169,7 +1170,10 @@ static ssize_t fuse_fill_write_pages(struct fuse_i= o_args *ia, > if (mapping_writably_mapped(mapping)) > flush_dcache_folio(folio); > =20 > - tmp =3D copy_folio_from_iter_atomic(folio, offset, bytes, ii); > + folio_offset =3D ((index - folio->index) << PAGE_SHIFT) + offset; > + bytes =3D min(folio_size(folio) - folio_offset, num); > + > + tmp =3D copy_folio_from_iter_atomic(folio, folio_offset, bytes, ii); Just to save someone else going down the same rabbit hole: copy_folio_from_iter_atomic() is defined as: static inline size_t copy_folio_from_iter_atomic(struct folio *folio, size_t offset, size_t bytes, struct iov_iter *i) { return copy_page_from_iter_atomic(&folio->page, offset, bytes, i); } ...which _looks_ sort of like it's not fully baked yet and can't handle a large folio, but it turns out that copy_page_from_iter_atomic() can handle compound pages, so I think this is actually OK. Whew! > flush_dcache_folio(folio); > =20 > if (!tmp) { > @@ -1180,6 +1184,7 @@ static ssize_t fuse_fill_write_pages(struct fuse_io= _args *ia, > =20 > err =3D 0; > ap->folios[ap->num_folios] =3D folio; > + ap->descs[ap->num_folios].offset =3D folio_offset; > ap->descs[ap->num_folios].length =3D tmp; > ap->num_folios++; > =20 > @@ -1187,11 +1192,11 @@ static ssize_t fuse_fill_write_pages(struct fuse_= io_args *ia, > pos +=3D tmp; > num -=3D tmp; > offset +=3D tmp; > - if (offset =3D=3D PAGE_SIZE) > + if (offset =3D=3D folio_size(folio)) > offset =3D 0; > =20 > - /* If we copied full page, mark it uptodate */ > - if (tmp =3D=3D PAGE_SIZE) > + /* If we copied full folio, mark it uptodate */ > + if (tmp =3D=3D folio_size(folio)) > folio_mark_uptodate(folio); > =20 > if (folio_test_uptodate(folio)) { --=20 Jeff Layton