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Thu, 5 Nov 2020 07:23:33 +0000 (UTC) X-HE-Tag: cup17_2a00d65272c8 X-Filterd-Recvd-Size: 6756 Received: from mx2.suse.de (mx2.suse.de [195.135.220.15]) by imf46.hostedemail.com (Postfix) with ESMTP for ; Thu, 5 Nov 2020 07:23:33 +0000 (UTC) X-Virus-Scanned: by amavisd-new at test-mx.suse.de DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1604561012; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:autocrypt:autocrypt; bh=gs3kDCEsjZd0ObDgJU2eziGQGC5WW614BMIjPljHg98=; b=gvczwPsX6/HBU0uKeyET9YnSJ+AogkuysnWGye2aQvqY6y8Dh2bYDLCsZ21MU+fJDzbMlV Q91fG81p7NvOUuN4auxA/9ephERzJYLy+2dCaC/QTUo9dhdnX1c1Pn2ljOefTkHjdcYkor 1Hf6iesHqopkLHXb+aagIAv3ZCQny8U= Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id DB29CAB95; Thu, 5 Nov 2020 07:23:31 +0000 (UTC) Subject: Re: [PATCH 06/17] mm/filemap: Don't call ->readpage if IOCB_WAITQ is set To: "Matthew Wilcox (Oracle)" , linux-fsdevel@vger.kernel.org, linux-mm@kvack.org Cc: hch@lst.de, kent.overstreet@gmail.com References: <20201102184312.25926-1-willy@infradead.org> <20201102184312.25926-7-willy@infradead.org> From: Nikolay Borisov Autocrypt: addr=nborisov@suse.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20201102184312.25926-7-willy@infradead.org> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 2.11.20 =D0=B3. 20:43 =D1=87., Matthew Wilcox (Oracle) wrote: > The readpage operation can block in many (most?) filesystems, so we > should punt to a work queue instead of calling it. This was the last > caller of lock_page_async(), so remove it. You mention lock_page_async, yet you remove lock_page_for_iocb. >=20 > Signed-off-by: Matthew Wilcox (Oracle) > --- > mm/filemap.c | 14 ++------------ > 1 file changed, 2 insertions(+), 12 deletions(-) >=20 > diff --git a/mm/filemap.c b/mm/filemap.c > index 7a4101ceb106..5bafd2dc830c 100644 > --- a/mm/filemap.c > +++ b/mm/filemap.c > @@ -2152,16 +2152,6 @@ static void shrink_readahead_size_eio(struct fil= e_ra_state *ra) > ra->ra_pages /=3D 4; > } > =20 > -static int lock_page_for_iocb(struct kiocb *iocb, struct page *page) > -{ > - if (iocb->ki_flags & IOCB_WAITQ) > - return lock_page_async(page, iocb->ki_waitq); > - else if (iocb->ki_flags & IOCB_NOWAIT) > - return trylock_page(page) ? 0 : -EAGAIN; > - else > - return lock_page_killable(page); > -} > - > static unsigned mapping_get_read_thps(struct address_space *mapping, > pgoff_t index, unsigned int nr_pages, struct page **pages) > { > @@ -2210,7 +2200,7 @@ static struct page *filemap_read_page(struct kioc= b *iocb, struct file *filp, > struct file_ra_state *ra =3D &filp->f_ra; > int error; > =20 > - if (iocb->ki_flags & (IOCB_NOIO | IOCB_NOWAIT)) { > + if (iocb->ki_flags & (IOCB_NOIO | IOCB_NOWAIT | IOCB_WAITQ)) { > unlock_page(page); > put_page(page); > return ERR_PTR(-EAGAIN); > @@ -2231,7 +2221,7 @@ static struct page *filemap_read_page(struct kioc= b *iocb, struct file *filp, > } > =20 > if (!PageUptodate(page)) { > - error =3D lock_page_for_iocb(iocb, page); > + error =3D lock_page_killable(page); > if (unlikely(error)) { > put_page(page); > return ERR_PTR(error); >=20