From patchwork Thu Sep 22 16:56:54 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Aleksandar Markovic X-Patchwork-Id: 9346289 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 9743360757 for ; Thu, 22 Sep 2016 17:56:58 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 8E4072AC11 for ; Thu, 22 Sep 2016 17:56:58 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 831522AC15; Thu, 22 Sep 2016 17:56:58 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 25AD32AC11 for ; Thu, 22 Sep 2016 17:56:58 +0000 (UTC) Received: from localhost ([::1]:55470 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bn8Ez-0002Ii-85 for patchwork-qemu-devel@patchwork.kernel.org; Thu, 22 Sep 2016 13:56:57 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:59524) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bn7LK-0001kc-DB for qemu-devel@nongnu.org; Thu, 22 Sep 2016 12:59:27 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1bn7LG-0007dC-A9 for qemu-devel@nongnu.org; Thu, 22 Sep 2016 12:59:25 -0400 Received: from mx2.rt-rk.com ([89.216.37.149]:33078 helo=mail.rt-rk.com) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bn7LF-0007cJ-Ud for qemu-devel@nongnu.org; Thu, 22 Sep 2016 12:59:22 -0400 Received: from localhost (localhost [127.0.0.1]) by mail.rt-rk.com (Postfix) with ESMTP id 0BE1D1A22B7; Thu, 22 Sep 2016 18:59:21 +0200 (CEST) X-Virus-Scanned: amavisd-new at rt-rk.com Received: from mcs19.domain.local (mcs19.domain.local [10.10.13.51]) by mail.rt-rk.com (Postfix) with ESMTPSA id DC4AF1A1FAB; Thu, 22 Sep 2016 18:59:20 +0200 (CEST) From: Aleksandar Markovic To: qemu-devel@nongnu.org, riku.voipio@iki.fi, laurent@vivier.eu, peter.maydell@linaro.org, petar.jovanovic@imgtec.com, miodrag.dinic@imgtec.com, aleksandar.rikalo@imgtec.com, aleksandar.markovic@imgtec.com Date: Thu, 22 Sep 2016 18:56:54 +0200 Message-Id: <20160922165712.79809-6-aleksandar.markovic@rt-rk.com> X-Mailer: git-send-email 2.9.3 In-Reply-To: <20160922165712.79809-1-aleksandar.markovic@rt-rk.com> References: <20160922165712.79809-1-aleksandar.markovic@rt-rk.com> X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 89.216.37.149 Subject: [Qemu-devel] [PATCH v7 05/10] linux-user: Add support for ustat() syscall X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP From: Aleksandar Markovic This patch implements Qemu user mode ustat() syscall support. Syscall ustat() returns information about a mounted filesystem. Its declaration is: int ustat(dev_t dev, struct ustat *ubuf); Its Linux kernel implementation is at fs/compat.c, line 334. The Qemu implementation proposed in this patch is similar to the Qemu implementations of statfs(), fstatfs() and other related syscalls. It is based on invocation of host's ustat(), and its key part is in the correspondent case segment of the main switch statement of the function do_syscall(), in file linux-user/syscalls.c. All necessary conversions of data structures from target to host and from host to target are covered. Support for target_ustat is included. Sufficient support for "-strace" option for this syscall is already present, and this patch does not change it. This patch also fixes failures of LTP tests ustat01, and ustat02, if executed on Qemu-emulated systems. Signed-off-by: Aleksandar Markovic --- linux-user/syscall.c | 23 +++++++++++++++++++++-- linux-user/syscall_defs.h | 6 ++++++ 2 files changed, 27 insertions(+), 2 deletions(-) diff --git a/linux-user/syscall.c b/linux-user/syscall.c index 563796a..d28f3e6 100644 --- a/linux-user/syscall.c +++ b/linux-user/syscall.c @@ -48,6 +48,7 @@ int __clone2(int (*fn)(void *), void *child_stack_base, #include #include #include +#include #include #include #include @@ -8226,9 +8227,27 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1, ret = get_errno(chroot(p)); unlock_user(p, arg1, 0); break; -#ifdef TARGET_NR_ustat +#if defined(TARGET_NR_ustat) case TARGET_NR_ustat: - goto unimplemented; + { + struct ustat ust; + + ret = get_errno(ustat(arg1, &ust)); + if (!is_error(ret)) { + struct target_ustat *target_ust; + + if (!lock_user_struct(VERIFY_WRITE, target_ust, arg2, 0)) { + goto efault; + } + __put_user(ust.f_tfree, &target_ust->f_tfree); + __put_user(ust.f_tinode, &target_ust->f_tinode); + memcpy(target_ust->f_fname, ust.f_fname, 6); + memcpy(target_ust->f_fpack, ust.f_fpack, 6); + unlock_user_struct(target_ust, arg2, 1); + } + } + break; + #endif #ifdef TARGET_NR_dup2 case TARGET_NR_dup2: diff --git a/linux-user/syscall_defs.h b/linux-user/syscall_defs.h index e47a61a..2c183d1 100644 --- a/linux-user/syscall_defs.h +++ b/linux-user/syscall_defs.h @@ -2164,6 +2164,12 @@ struct target_statfs64 { }; #endif +struct target_ustat { + abi_ulong f_tfree; + abi_int f_tinode; + char f_fname[6]; + char f_fpack[6]; +}; #define TARGET_F_DUPFD 0 /* dup */ #define TARGET_F_GETFD 1 /* get close_on_exec */