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 0B57C22ACDC; Mon, 10 Mar 2025 17:59:46 +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=1741629586; cv=none; b=GmqLwOuRfB/6EeYctwKLllK+z9ehGIl7lJ9NIMZUFldO5BURgWRU4CDr0Q7QT4N6kPeV4VeB5vYl7BQfoVhAWJkJrWXHfMWEcSUTtevQe4jDQNKC0SsoP8ArHdtUyxknJ2moFlCT66Ch3wE9bRd9GoFeBjxv+lkMvdUv5hUqWiE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741629586; c=relaxed/simple; bh=+1n+gxKsLvffICNc/+IuX4OwN4PDYpv+UDuaGDnsNMo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=VsymG1vSVTN0YghmUheE+jTdrpzO8+3m1dTr7cuvw1K1dC/M0CjSvaU0vLcGYhdoS2UyeNFdTcEdtDp3PaXBfnJimjeCObJrpr66lUfsXaVr1oTZnCMf3F82laJVuMqAISzFwNRc+4oYEMpylBbkAUbUxTKJvtq8gn9vsYhc3Zs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=cqgHoskI; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="cqgHoskI" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 831E7C4CEE5; Mon, 10 Mar 2025 17:59:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1741629585; bh=+1n+gxKsLvffICNc/+IuX4OwN4PDYpv+UDuaGDnsNMo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=cqgHoskIaKsINNOWYIk7ockP/FZ+KJUxfFr7r3nyiVWzITwe2Zu3K73OcdKrVKHT1 rhS3kjidpJLP1OjoP6nGrwwT4jA6vUYNztY3FDa0h9pb2e2BhLbveDTT7wSn5HjhRN JRaK0b3jFzrnYUmw3g+o6t9JfCAeqogyqaUEPujg= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Mike Snitzer , Anna Schumaker Subject: [PATCH 5.15 318/620] pnfs/flexfiles: retry getting layout segment for reads Date: Mon, 10 Mar 2025 18:02:44 +0100 Message-ID: <20250310170558.165533792@linuxfoundation.org> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250310170545.553361750@linuxfoundation.org> References: <20250310170545.553361750@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Mike Snitzer commit eb3fabde15bccdf34f1c9b35a83aa4c0dacbb4ca upstream. If ff_layout_pg_get_read()'s attempt to get a layout segment results in -EAGAIN have ff_layout_pg_init_read() retry it after sleeping. If "softerr" mount is used, use 'io_maxretrans' to limit the number of attempts to get a layout segment. This fixes a long-standing issue of O_DIRECT reads failing with -EAGAIN (11) when using flexfiles Client Side Mirroring (CSM). Cc: stable@vger.kernel.org Signed-off-by: Mike Snitzer Signed-off-by: Anna Schumaker Signed-off-by: Greg Kroah-Hartman --- fs/nfs/flexfilelayout/flexfilelayout.c | 27 +++++++++++++++++++++------ 1 file changed, 21 insertions(+), 6 deletions(-) --- a/fs/nfs/flexfilelayout/flexfilelayout.c +++ b/fs/nfs/flexfilelayout/flexfilelayout.c @@ -836,6 +836,9 @@ ff_layout_pg_init_read(struct nfs_pageio struct nfs4_pnfs_ds *ds; u32 ds_idx; + if (NFS_SERVER(pgio->pg_inode)->flags & + (NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR)) + pgio->pg_maxretrans = io_maxretrans; retry: ff_layout_pg_check_layout(pgio, req); /* Use full layout for now */ @@ -849,6 +852,8 @@ retry: if (!pgio->pg_lseg) goto out_nolseg; } + /* Reset wb_nio, since getting layout segment was successful */ + req->wb_nio = 0; ds = ff_layout_get_ds_for_read(pgio, &ds_idx); if (!ds) { @@ -865,14 +870,24 @@ retry: pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].rsize; pgio->pg_mirror_idx = ds_idx; - - if (NFS_SERVER(pgio->pg_inode)->flags & - (NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR)) - pgio->pg_maxretrans = io_maxretrans; return; out_nolseg: - if (pgio->pg_error < 0) - return; + if (pgio->pg_error < 0) { + if (pgio->pg_error != -EAGAIN) + return; + /* Retry getting layout segment if lower layer returned -EAGAIN */ + if (pgio->pg_maxretrans && req->wb_nio++ > pgio->pg_maxretrans) { + if (NFS_SERVER(pgio->pg_inode)->flags & NFS_MOUNT_SOFTERR) + pgio->pg_error = -ETIMEDOUT; + else + pgio->pg_error = -EIO; + return; + } + pgio->pg_error = 0; + /* Sleep for 1 second before retrying */ + ssleep(1); + goto retry; + } out_mds: trace_pnfs_mds_fallback_pg_init_read(pgio->pg_inode, 0, NFS4_MAX_UINT64, IOMODE_READ,