From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pf1-f193.google.com ([209.85.210.193]:42310 "EHLO mail-pf1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726744AbeHIUhN (ORCPT ); Thu, 9 Aug 2018 16:37:13 -0400 From: Naohiro Aota To: David Sterba , linux-btrfs@vger.kernel.org Cc: Chris Mason , Josef Bacik , linux-kernel@vger.kernel.org, Hannes Reinecke , Damien Le Moal , Bart Van Assche , Matias Bjorling , Naohiro Aota Subject: [RFC PATCH 02/12] btrfs-progs: utils: Introduce queue_param Date: Fri, 10 Aug 2018 03:10:55 +0900 Message-Id: <20180809181105.12856-2-naota@elisp.net> In-Reply-To: <20180809181105.12856-1-naota@elisp.net> References: <20180809180450.5091-1-naota@elisp.net> <20180809181105.12856-1-naota@elisp.net> Sender: linux-btrfs-owner@vger.kernel.org List-ID: Introduce the queue_param function to get a device request queue parameter and this function to test if the device is an SSD in is_ssd(). Signed-off-by: Damien Le Moal [Naohiro] fixed error return value Signed-off-by: Naohiro Aota --- mkfs/main.c | 40 ++-------------------------------------- utils.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++ utils.h | 1 + 3 files changed, 49 insertions(+), 38 deletions(-) diff --git a/mkfs/main.c b/mkfs/main.c index b76462a7..83969b4b 100644 --- a/mkfs/main.c +++ b/mkfs/main.c @@ -435,49 +435,13 @@ static int zero_output_file(int out_fd, u64 size) static int is_ssd(const char *file) { - blkid_probe probe; - char wholedisk[PATH_MAX]; - char sysfs_path[PATH_MAX]; - dev_t devno; - int fd; char rotational; int ret; - probe = blkid_new_probe_from_filename(file); - if (!probe) + ret = queue_param(file, "rotational", &rotational, 1); + if (ret < 1) return 0; - /* Device number of this disk (possibly a partition) */ - devno = blkid_probe_get_devno(probe); - if (!devno) { - blkid_free_probe(probe); - return 0; - } - - /* Get whole disk name (not full path) for this devno */ - ret = blkid_devno_to_wholedisk(devno, - wholedisk, sizeof(wholedisk), NULL); - if (ret) { - blkid_free_probe(probe); - return 0; - } - - snprintf(sysfs_path, PATH_MAX, "/sys/block/%s/queue/rotational", - wholedisk); - - blkid_free_probe(probe); - - fd = open(sysfs_path, O_RDONLY); - if (fd < 0) { - return 0; - } - - if (read(fd, &rotational, 1) < 1) { - close(fd); - return 0; - } - close(fd); - return rotational == '0'; } diff --git a/utils.c b/utils.c index d4395b1f..2212692c 100644 --- a/utils.c +++ b/utils.c @@ -65,6 +65,52 @@ static unsigned short rand_seed[3]; struct btrfs_config bconf; +/* + * Get a device request queue parameter. + */ +int queue_param(const char *file, const char *param, char *buf, size_t len) +{ + blkid_probe probe; + char wholedisk[PATH_MAX]; + char sysfs_path[PATH_MAX]; + dev_t devno; + int fd; + int ret; + + probe = blkid_new_probe_from_filename(file); + if (!probe) + return 0; + + /* Device number of this disk (possibly a partition) */ + devno = blkid_probe_get_devno(probe); + if (!devno) { + blkid_free_probe(probe); + return 0; + } + + /* Get whole disk name (not full path) for this devno */ + ret = blkid_devno_to_wholedisk(devno, + wholedisk, sizeof(wholedisk), NULL); + if (ret) { + blkid_free_probe(probe); + return 0; + } + + snprintf(sysfs_path, PATH_MAX, "/sys/block/%s/queue/%s", + wholedisk, param); + + blkid_free_probe(probe); + + fd = open(sysfs_path, O_RDONLY); + if (fd < 0) + return 0; + + len = read(fd, buf, len); + close(fd); + + return len; +} + /* * Discard the given range in one go */ diff --git a/utils.h b/utils.h index b6c00cfa..ac333095 100644 --- a/utils.h +++ b/utils.h @@ -120,6 +120,7 @@ int get_label(const char *btrfs_dev, char *label); int set_label(const char *btrfs_dev, const char *label); char *__strncpy_null(char *dest, const char *src, size_t n); +int queue_param(const char *file, const char *param, char *buf, size_t len); int is_block_device(const char *file); int is_mount_point(const char *file); int is_path_exist(const char *file); -- 2.18.0