From nobody Fri Dec 26 17:39:20 2025 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (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 336AA1B292 for ; Wed, 3 Jan 2024 14:59:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="NzBP1IFG" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1704293997; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=SdFCD8YJUNnwtU5qwz/M+xF7ih7tS/QW8qR9RpiR7QY=; b=NzBP1IFG5kRUehdC9xp0+JWMT8f/3WKEbQ1ao4h8MOMV5w/W7qKprmGHtIUEMmh8seQ98S fRKg0PH1zhR3CgVGVGpIVmogmPVBp1uo44lH9EZZy8X7pnGNG+Ervsgs6f5Nk5zVe5NMZV mCvnYO1Vs+jvGmcCV/cAdxdMp/eEJd0= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-369-l-ZawQD_NwSxVHuoSJh8mg-1; Wed, 03 Jan 2024 09:59:54 -0500 X-MC-Unique: l-ZawQD_NwSxVHuoSJh8mg-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.rdu2.redhat.com [10.11.54.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 450EB83B826; Wed, 3 Jan 2024 14:59:53 +0000 (UTC) Received: from warthog.procyon.org.com (unknown [10.42.28.68]) by smtp.corp.redhat.com (Postfix) with ESMTP id 45F673C27; Wed, 3 Jan 2024 14:59:49 +0000 (UTC) From: David Howells To: Christian Brauner , Jeff Layton , Gao Xiang , Dominique Martinet Cc: David Howells , Steve French , Matthew Wilcox , Marc Dionne , Paulo Alcantara , Shyam Prasad N , Tom Talpey , Eric Van Hensbergen , Ilya Dryomov , linux-cachefs@redhat.com, linux-afs@lists.infradead.org, linux-cifs@vger.kernel.org, linux-nfs@vger.kernel.org, ceph-devel@vger.kernel.org, v9fs@lists.linux.dev, linux-erofs@lists.ozlabs.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Yiqun Leng , Jia Zhu Subject: [PATCH 1/5] cachefiles: Fix __cachefiles_prepare_write() Date: Wed, 3 Jan 2024 14:59:25 +0000 Message-ID: <20240103145935.384404-2-dhowells@redhat.com> In-Reply-To: <20240103145935.384404-1-dhowells@redhat.com> References: <20240103145935.384404-1-dhowells@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.1 Content-Type: text/plain; charset="utf-8" Fix __cachefiles_prepare_write() to correctly determine whether the requested write will fit correctly with the DIO alignment. Reported-by: Gao Xiang Signed-off-by: David Howells Tested-by: Yiqun Leng Tested-by: Jia Zhu cc: Jeff Layton cc: linux-cachefs@redhat.com cc: linux-erofs@lists.ozlabs.org cc: linux-fsdevel@vger.kernel.org cc: linux-mm@kvack.org Reported-by: Simon Horman Reported-by: kernel test robot Reviewed-by: Simon Horman --- fs/cachefiles/io.c | 28 +++++++++++++++++----------- 1 file changed, 17 insertions(+), 11 deletions(-) diff --git a/fs/cachefiles/io.c b/fs/cachefiles/io.c index bffffedce4a9..7529b40bc95a 100644 --- a/fs/cachefiles/io.c +++ b/fs/cachefiles/io.c @@ -522,16 +522,22 @@ int __cachefiles_prepare_write(struct cachefiles_obje= ct *object, bool no_space_allocated_yet) { struct cachefiles_cache *cache =3D object->volume->cache; - loff_t start =3D *_start, pos; - size_t len =3D *_len, down; + unsigned long long start =3D *_start, pos; + size_t len =3D *_len; int ret; =20 /* Round to DIO size */ - down =3D start - round_down(start, PAGE_SIZE); - *_start =3D start - down; - *_len =3D round_up(down + len, PAGE_SIZE); - if (down < start || *_len > upper_len) + start =3D round_down(*_start, PAGE_SIZE); + if (start !=3D *_start) { + kleave(" =3D -ENOBUFS [down]"); + return -ENOBUFS; + } + if (*_len > upper_len) { + kleave(" =3D -ENOBUFS [up]"); return -ENOBUFS; + } + + *_len =3D round_up(len, PAGE_SIZE); =20 /* We need to work out whether there's sufficient disk space to perform * the write - but we can skip that check if we have space already @@ -542,7 +548,7 @@ int __cachefiles_prepare_write(struct cachefiles_object= *object, =20 pos =3D cachefiles_inject_read_error(); if (pos =3D=3D 0) - pos =3D vfs_llseek(file, *_start, SEEK_DATA); + pos =3D vfs_llseek(file, start, SEEK_DATA); if (pos < 0 && pos >=3D (loff_t)-MAX_ERRNO) { if (pos =3D=3D -ENXIO) goto check_space; /* Unallocated tail */ @@ -550,7 +556,7 @@ int __cachefiles_prepare_write(struct cachefiles_object= *object, cachefiles_trace_seek_error); return pos; } - if ((u64)pos >=3D (u64)*_start + *_len) + if (pos >=3D start + *_len) goto check_space; /* Unallocated region */ =20 /* We have a block that's at least partially filled - if we're low on @@ -563,13 +569,13 @@ int __cachefiles_prepare_write(struct cachefiles_obje= ct *object, =20 pos =3D cachefiles_inject_read_error(); if (pos =3D=3D 0) - pos =3D vfs_llseek(file, *_start, SEEK_HOLE); + pos =3D vfs_llseek(file, start, SEEK_HOLE); if (pos < 0 && pos >=3D (loff_t)-MAX_ERRNO) { trace_cachefiles_io_error(object, file_inode(file), pos, cachefiles_trace_seek_error); return pos; } - if ((u64)pos >=3D (u64)*_start + *_len) + if (pos >=3D start + *_len) return 0; /* Fully allocated */ =20 /* Partially allocated, but insufficient space: cull. */ @@ -577,7 +583,7 @@ int __cachefiles_prepare_write(struct cachefiles_object= *object, ret =3D cachefiles_inject_remove_error(); if (ret =3D=3D 0) ret =3D vfs_fallocate(file, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE, - *_start, *_len); + start, *_len); if (ret < 0) { trace_cachefiles_io_error(object, file_inode(file), ret, cachefiles_trace_fallocate_error);