From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793631998; b=MrPAE5D5cBXlD4FJpM/D169i83ERiCeQoK90KcXU66LPJ1Pa3i/S5QFbklTnOqojxuHO 4S5KxPwVEyKpezu9gAmbry97M+A18k5/Z/+s8NUdb6hsRHj9AfdKrofyvuC8jAYbueRpR mIYsc4GRXxlDekphRt0/J6CDzvRkrXTRKFnmYWtVJ05lwE0KckokmQ4nIARXVYjKCeADc UWe2IrO03pytgTmHqTV5uqDpBFisbN9HI0Azu9B9e5STWQdQCIpoxe6vLxcIib9ZD2cJl DgNf0BlRBfgmXErxjdqwhtXgoLGPsxMSuGU5gMyIzZPfNM5OuRFMkrqK6mLAvEM+s7w== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793631998; h=Received:DKIM-Signature:From:Date:Subject:MIME-Version:Content-Type: Content-Transfer-Encoding:Message-Id:References:In-Reply-To:To:Cc: X-Mailer; bh=D0DFho69O6i+rlC573E8+GaY0MO1KK9pTFWx3bkx1uo=; b=pg5bztbQY4RR20hjrDl3zrepr+0TAFA1JOah6ji13iUpkfQbvSyoqx5ZJKP4UEny2Mzx ul1cmAaz9/Sh80SGZOe2PBDYka9slEWunPKdNv4WSPL3O6iMxIAMesSh7935tSav+WLd8 jbDK4swbWjus7lgiSgNPZAjI8HVEI55BlhOXWkeZZZRg401Ylxmwu+q58duPukoIB0eJb oMA55E4KbSQpwzJTA+aY4JdLGLfaD1NDMqaVSOaHDXNc+4QSVgtRMsl5iqgdey54xa/0e sv8Hw7P5XeVCI+DKzstHqFWF2Nv/6WXBKwMUaSa/Ve36wN96jy5dkV9TOiNrkaRjGfg== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=g5jXfmAk; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7A819606B0C2; Mon, 2 Nov 2026 15:06:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=g5jXfmAk Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7C9F61F00A18; Mon, 2 Nov 2026 15:06:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793631997; bh=D0DFho69O6i+rlC573E8+GaY0MO1KK9pTFWx3bkx1uo=; h=From:Date:Subject:References:In-Reply-To:To:Cc; b=g5jXfmAkkpbVCcZt3JDC6TsuxQAsfUSbPkDCW7uGVgAQzBE/zvcO7qIvScymWJQ1K n8VazwD2M6Wv79JGlT69a8nmYNWac2kVIU0U/zNaRABKDdAMHpHFgYNA7PEr0PWLeq AebGp1CYYILUE3HH0K8Y/R8JSuxQScRPfh8nZYzeZx50h2vf5qPHNhypeg7PD0iwQv 2+ikdTJsIqiI2yCYwee54jqzaLiVLYJuCtuzzPKkyLzadUHizvSp/DBA0MNt56rv5I 6IBbiNCpEUyFyP/cack1HnEo1QC0pmP0eyaIxCT6k4iIzuTLNpD4qjm+qx0GtucpmL 2tYUkabqdbO9Q== From: Christian Brauner Date: Mon, 02 Nov 2026 16:01:42 +0100 Subject: [PATCH RFC 15/22] xtensa: simdisk: let procfs copy in writes X-Mailing-List: linux-fbdev@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20261102-work-procfs-arch-v1-15-c9492ab08480@kernel.org> References: <20261102-work-procfs-arch-v1-0-c9492ab08480@kernel.org> In-Reply-To: <20261102-work-procfs-arch-v1-0-c9492ab08480@kernel.org> To: linux-fsdevel@vger.kernel.org Cc: Linus Torvalds , Jann Horn , Josef Bacik , Chris Mason , Jeff Layton , NeilBrown , Eric Dumazet , Thomas Gleixner , Al Viro , Jonathan Corbet , Christoph Hellwig , Greg Kroah-Hartman , Joel Granados , Kees Cook , Jan Kara , Jan Kara , linux-kernel@vger.kernel.org, linux-nfs@vger.kernel.org, linux-acpi@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-s390@vger.kernel.org, linux-scsi@vger.kernel.org, linux-um@lists.infradead.org, linux-wireless@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, netdev@vger.kernel.org, ntfs3@lists.linux.dev, platform-driver-x86@vger.kernel.org, coreteam@netfilter.org, kexec@lists.infradead.org, linux-pci@vger.kernel.org, linux-sound@vger.kernel.org, netfilter-devel@vger.kernel.org, dri-devel@lists.freedesktop.org, ibm-acpi-devel@lists.sourceforge.net, jfs-discussion@lists.sourceforge.net, linux-alpha@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-cifs@vger.kernel.org, linux-fbdev@vger.kernel.org, linux-hwmon@vger.kernel.org, linux-mm@kvack.org, linux-sh@vger.kernel.org, linux-usb@vger.kernel.org, samba-technical@lists.samba.org, sparclinux@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-doc@vger.kernel.org, linux-serial@vger.kernel.org, linux-atm-general@lists.sourceforge.net, Takashi Iwai , linux-input@vger.kernel.org, linux-raid@vger.kernel.org, linux-ext4@vger.kernel.org, linux-modules@vger.kernel.org, linux-debuggers@vger.kernel.org, "Christian Brauner (Amutable)" , Chuck Lever X-Mailer: b4 0.17-dev Implement ->proc_write_buf() so procfs copies in what is written to the simdisk files before it pins the entry, and take the file name from that copy. The files took up to PAGE_SIZE bytes and keep doing that through ->proc_write_size. Signed-off-by: Christian Brauner (Amutable) --- arch/xtensa/platforms/iss/simdisk.c | 26 ++++++++++---------------- 1 file changed, 10 insertions(+), 16 deletions(-) diff --git a/arch/xtensa/platforms/iss/simdisk.c b/arch/xtensa/platforms/iss/simdisk.c index 7b115e023de9..b2f9e7f3ade3 100644 --- a/arch/xtensa/platforms/iss/simdisk.c +++ b/arch/xtensa/platforms/iss/simdisk.c @@ -241,7 +241,7 @@ static ssize_t proc_read_simdisk(struct file *file, char __user *buf, ssize_t len; char *temp; - /* a write sets at most a page, see proc_write_simdisk() */ + /* a write sets at most a page, see simdisk_proc_ops */ temp = kmalloc(PAGE_SIZE + 2, GFP_KERNEL); if (!temp) return -ENOMEM; @@ -255,40 +255,34 @@ static ssize_t proc_read_simdisk(struct file *file, char __user *buf, return len; } -static ssize_t proc_write_simdisk(struct file *file, const char __user *buf, +static ssize_t proc_write_simdisk(struct file *file, char *buf, size_t count, loff_t *ppos) { - char *tmp; struct simdisk *dev = pde_data(file_inode(file)); int err; - if (count == 0 || count > PAGE_SIZE) + if (count == 0) return -EINVAL; - tmp = memdup_user_nul(buf, count); - if (IS_ERR(tmp)) - return PTR_ERR(tmp); - err = simdisk_detach(dev); if (err != 0) - goto out_free; + return err; - if (count > 0 && tmp[count - 1] == '\n') - tmp[count - 1] = 0; + if (count > 0 && buf[count - 1] == '\n') + buf[count - 1] = 0; - if (tmp[0]) - err = simdisk_attach(dev, tmp); + if (buf[0]) + err = simdisk_attach(dev, buf); if (err == 0) err = count; -out_free: - kfree(tmp); return err; } static const struct proc_ops simdisk_proc_ops = { .proc_read = proc_read_simdisk, - .proc_write = proc_write_simdisk, + .proc_write_buf = proc_write_simdisk, + .proc_write_size = PAGE_SIZE, .proc_lseek = default_llseek, }; -- 2.53.0