From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ig0-x22f.google.com ([2607:f8b0:4001:c05::22f]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1YbZsN-0000eA-PA for linux-mtd@lists.infradead.org; Fri, 27 Mar 2015 19:25:06 +0000 Received: by igcxg11 with SMTP id xg11so28888654igc.0 for ; Fri, 27 Mar 2015 12:24:39 -0700 (PDT) Sender: Daniel Ehrenberg From: Dan Ehrenberg To: computersforpeace@gmail.com, linux-mtd@lists.infradead.org, ezequiel@vanguardiasur.com.ar, Richard Weinberger Subject: [PATCH v3 2/3] mtd: part: Add sysfs variable for offset of partition Date: Fri, 27 Mar 2015 12:24:16 -0700 Message-Id: <1427484257-13708-3-git-send-email-dehrenberg@chromium.org> In-Reply-To: <1427484257-13708-1-git-send-email-dehrenberg@chromium.org> References: <1427484257-13708-1-git-send-email-dehrenberg@chromium.org> Cc: gwendal@chromium.org, Dan Ehrenberg List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , This patch makes a sysfs variable called 'offset' on each partition which contains the offset in bytes from the beginning of the master device that the partition starts. Signed-off-by: Dan Ehrenberg --- drivers/mtd/mtdpart.c | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) diff --git a/drivers/mtd/mtdpart.c b/drivers/mtd/mtdpart.c index a19ec5a..b8ed202 100644 --- a/drivers/mtd/mtdpart.c +++ b/drivers/mtd/mtdpart.c @@ -554,6 +554,30 @@ out_register: return slave; } +static ssize_t mtd_partition_offset_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct mtd_info *mtd = dev_get_drvdata(dev); + struct mtd_part *part = PART(mtd); + return snprintf(buf, PAGE_SIZE, "%lld\n", part->offset); +} + +static DEVICE_ATTR(offset, S_IRUGO, mtd_partition_offset_show, NULL); + +const static struct attribute *mtd_partition_attrs[] = { + &dev_attr_offset.attr, + NULL +}; + +int mtd_add_partition_attrs(struct mtd_part *new) +{ + int ret = sysfs_create_files(&new->mtd.dev.kobj, mtd_partition_attrs); + if (ret) + printk(KERN_WARNING + "mtd: failed to create partition attrs, err=%d\n", ret); + return ret; +} + int mtd_add_partition(struct mtd_info *master, const char *name, long long offset, long long length) { @@ -603,6 +627,8 @@ int mtd_add_partition(struct mtd_info *master, const char *name, add_mtd_device(&new->mtd); + mtd_add_partition_attrs(new); + return ret; err_inv: mutex_unlock(&mtd_partitions_mutex); @@ -620,6 +646,8 @@ int mtd_del_partition(struct mtd_info *master, int partno) list_for_each_entry_safe(slave, next, &mtd_partitions, list) if ((slave->master == master) && (slave->mtd.index == partno)) { + sysfs_remove_files(&slave->mtd.dev.kobj, + mtd_partition_attrs); ret = del_mtd_device(&slave->mtd); if (ret < 0) break; @@ -663,6 +691,7 @@ int add_mtd_partitions(struct mtd_info *master, mutex_unlock(&mtd_partitions_mutex); add_mtd_device(&slave->mtd); + mtd_add_partition_attrs(slave); cur_offset = slave->offset + slave->mtd.size; } -- 2.2.0.rc0.207.ga3a616c