From patchwork Thu Oct 27 15:44:58 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sam Li X-Patchwork-Id: 13022323 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 297F8FA3740 for ; Thu, 27 Oct 2022 15:50:33 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1oo54v-0000wD-Pc; Thu, 27 Oct 2022 11:45:57 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oo54r-0000Vk-IL; Thu, 27 Oct 2022 11:45:55 -0400 Received: from mail-pl1-x634.google.com ([2607:f8b0:4864:20::634]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1oo54c-00013p-6L; Thu, 27 Oct 2022 11:45:46 -0400 Received: by mail-pl1-x634.google.com with SMTP id n7so1930384plp.1; Thu, 27 Oct 2022 08:45:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=R2mJnjpcL3xEm+xhC8qiDzUKjlvtfd7jwLm78mbcKIo=; b=ErbE84OaBfXWc9UeTJ/0eD35tKlEOc0TL6KL5/gR0rxt2NrmwSh27uCClVpFnlx98M 3oqoySfVp3v3EGSA/2uaqbM9171DU86kRZAzMguSikiyaTin6Z3ixAoNemJaW6cPn0fp 5n5GiBDvmjArnoTvL6FsGBQ68Ayn5kmbCgxo51h776yqmmUDySuXJjZv7vcyxz8S+x5s Xy3lpg0IUjIkc2rh3+QSe2pKPPvUUWaFgP0pOurE8BNEXrfYfGhhqx7maW/uJ0EMH3wH +G4OkYECW02HKxNJgS7uS1nB6sCk33tOTaarAzY3nL3lkHe1LuF/4X5KUS+4ZucUvRfT lkeg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=R2mJnjpcL3xEm+xhC8qiDzUKjlvtfd7jwLm78mbcKIo=; b=X4BZL63VFliXrAfNOJgYJsrdX7k93AjBQnAl+g/RHUB5KzaBi7710m5PEUoELyrsNV loeXTIeWxF4XdJN6pmQ2Elp4y53fpMkkC/6LeF4DtNuK7Vn45M6GFcsfOB/U9WkINKcu BIat0ZbkLehg8m7RY/RNsqqabQJP5tIsR/JtEp3d5itSbHTkrMvnqyJz/ugZvoD7y45g DL7lQ1HT3Bk6OVtVmA0kJ+GFAs5VNJnIL/ZEBAhInH0nx2oG41noVH563tquU0W8RGwF M4zx3gUwa2RWphrm4Ru6RPnOGL2/BpR3saiiwgh7wRKthAKoGJiONBLkul+SP/JSL8Uf AcCA== X-Gm-Message-State: ACrzQf1b3nSoopmaWOc4A3MaqKTf2lBPaKO6UkR12wFG56ldXtVmAnxD HuttdIFYRzJex51oT7red1Mq0xZW41k2x+nx X-Google-Smtp-Source: AMsMyM7chBDQNPc7gk62PmL5S3CDhI3s3pa2UJQaMre+L+VNxVUm0yxOP0UofBEU+2RLPppDfbtdUA== X-Received: by 2002:a17:902:f786:b0:186:7a6b:217c with SMTP id q6-20020a170902f78600b001867a6b217cmr33127410pln.55.1666885535854; Thu, 27 Oct 2022 08:45:35 -0700 (PDT) Received: from roots.. ([112.44.202.248]) by smtp.gmail.com with ESMTPSA id q9-20020a63d609000000b004405c6eb962sm1232801pgg.4.2022.10.27.08.45.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 27 Oct 2022 08:45:35 -0700 (PDT) From: Sam Li To: qemu-devel@nongnu.org Cc: Fam Zheng , Hanna Reitz , damien.lemoal@opensource.wdc.com, qemu-block@nongnu.org, stefanha@redhat.com, Markus Armbruster , hare@suse.de, Kevin Wolf , dmitry.fomichev@wdc.com, Eric Blake , Sam Li Subject: [PATCH v13 2/8] file-posix: introduce helper functions for sysfs attributes Date: Thu, 27 Oct 2022 23:44:58 +0800 Message-Id: <20221027154504.20684-3-faithilikerun@gmail.com> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221027154504.20684-1-faithilikerun@gmail.com> References: <20221027154504.20684-1-faithilikerun@gmail.com> MIME-Version: 1.0 Received-SPF: pass client-ip=2607:f8b0:4864:20::634; envelope-from=faithilikerun@gmail.com; helo=mail-pl1-x634.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "Qemu-devel" Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Use get_sysfs_str_val() to get the string value of device zoned model. Then get_sysfs_zoned_model() can convert it to BlockZoneModel type of QEMU. Use get_sysfs_long_val() to get the long value of zoned device information. Signed-off-by: Sam Li Reviewed-by: Hannes Reinecke Reviewed-by: Stefan Hajnoczi Reviewed-by: Damien Le Moal Reviewed-by: Dmitry Fomichev --- block/file-posix.c | 124 ++++++++++++++++++++++--------- include/block/block_int-common.h | 3 + 2 files changed, 91 insertions(+), 36 deletions(-) diff --git a/block/file-posix.c b/block/file-posix.c index 23acffb9a4..8cb07fdb8a 100644 --- a/block/file-posix.c +++ b/block/file-posix.c @@ -1201,66 +1201,112 @@ static int hdev_get_max_hw_transfer(int fd, struct stat *st) #endif } -static int hdev_get_max_segments(int fd, struct stat *st) -{ +/* + * Get a sysfs attribute value as character string. + */ +static int get_sysfs_str_val(struct stat *st, const char *attribute, + char **val) { #ifdef CONFIG_LINUX - char buf[32]; - const char *end; - char *sysfspath = NULL; + g_autofree char *sysfspath = NULL; int ret; - int sysfd = -1; - long max_segments; + size_t len; - if (S_ISCHR(st->st_mode)) { - if (ioctl(fd, SG_GET_SG_TABLESIZE, &ret) == 0) { - return ret; - } + if (!S_ISBLK(st->st_mode)) { return -ENOTSUP; } - if (!S_ISBLK(st->st_mode)) { - return -ENOTSUP; + sysfspath = g_strdup_printf("/sys/dev/block/%u:%u/queue/%s", + major(st->st_rdev), minor(st->st_rdev), + attribute); + ret = g_file_get_contents(sysfspath, val, &len, NULL); + if (ret == -1) { + return -ENOENT; } - sysfspath = g_strdup_printf("/sys/dev/block/%u:%u/queue/max_segments", - major(st->st_rdev), minor(st->st_rdev)); - sysfd = open(sysfspath, O_RDONLY); - if (sysfd == -1) { - ret = -errno; - goto out; + /* The file is ended with '\n' */ + char *p; + p = *val; + if (*(p + len - 1) == '\n') { + *(p + len - 1) = '\0'; } - do { - ret = read(sysfd, buf, sizeof(buf) - 1); - } while (ret == -1 && errno == EINTR); + return ret; +#else + return -ENOTSUP; +#endif +} + +static int get_sysfs_zoned_model(struct stat *st, BlockZoneModel *zoned) +{ + g_autofree char *val = NULL; + int ret; + + ret = get_sysfs_str_val(st, "zoned", &val); if (ret < 0) { - ret = -errno; - goto out; - } else if (ret == 0) { - ret = -EIO; - goto out; + return ret; } - buf[ret] = 0; - /* The file is ended with '\n', pass 'end' to accept that. */ - ret = qemu_strtol(buf, &end, 10, &max_segments); - if (ret == 0 && end && *end == '\n') { - ret = max_segments; + + if (strcmp(val, "host-managed") == 0) { + *zoned = BLK_Z_HM; + } else if (strcmp(val, "host-aware") == 0) { + *zoned = BLK_Z_HA; + } else if (strcmp(val, "none") == 0) { + *zoned = BLK_Z_NONE; + } else { + return -ENOTSUP; } + return 0; +} -out: - if (sysfd != -1) { - close(sysfd); +/* + * Get a sysfs attribute value as a long integer. + */ +static long get_sysfs_long_val(struct stat *st, const char *attribute) +{ +#ifdef CONFIG_LINUX + g_autofree char *str = NULL; + const char *end; + long val; + int ret; + + ret = get_sysfs_str_val(st, attribute, &str); + if (ret < 0) { + return ret; + } + + /* The file is ended with '\n', pass 'end' to accept that. */ + ret = qemu_strtol(str, &end, 10, &val); + if (ret == 0 && end && *end == '\0') { + ret = val; } - g_free(sysfspath); return ret; #else return -ENOTSUP; #endif } +static int hdev_get_max_segments(int fd, struct stat *st) +{ +#ifdef CONFIG_LINUX + int ret; + + if (S_ISCHR(st->st_mode)) { + if (ioctl(fd, SG_GET_SG_TABLESIZE, &ret) == 0) { + return ret; + } + return -ENOTSUP; + } + return get_sysfs_long_val(st, "max_segments"); +#else + return -ENOTSUP; +#endif +} + static void raw_refresh_limits(BlockDriverState *bs, Error **errp) { BDRVRawState *s = bs->opaque; struct stat st; + int ret; + BlockZoneModel zoned; s->needs_alignment = raw_needs_alignment(bs); raw_probe_alignment(bs, s->fd, errp); @@ -1298,6 +1344,12 @@ static void raw_refresh_limits(BlockDriverState *bs, Error **errp) bs->bl.max_hw_iov = ret; } } + + ret = get_sysfs_zoned_model(&st, &zoned); + if (ret < 0) { + zoned = BLK_Z_NONE; + } + bs->bl.zoned = zoned; } static int check_for_dasd(int fd) diff --git a/include/block/block_int-common.h b/include/block/block_int-common.h index 8947abab76..7f7863cc9e 100644 --- a/include/block/block_int-common.h +++ b/include/block/block_int-common.h @@ -825,6 +825,9 @@ typedef struct BlockLimits { /* maximum number of iovec elements */ int max_iov; + + /* device zone model */ + BlockZoneModel zoned; } BlockLimits; typedef struct BdrvOpBlocker BdrvOpBlocker;