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git://git.openwrt.org/openwrt/openwrt.git
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bc03add273
Export the ubi_num and vol_id into the sysfs record of the gluebi- emulated mtd device. Previously userspace didn't have a way to map gluebi-emulated devices back to their corresponding ubi volumes. SVN-Revision: 40306
89 lines
2.7 KiB
Diff
89 lines
2.7 KiB
Diff
Index: linux-3.13.2/drivers/mtd/ubi/gluebi.c
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===================================================================
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--- linux-3.13.2.orig/drivers/mtd/ubi/gluebi.c
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+++ linux-3.13.2/drivers/mtd/ubi/gluebi.c
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@@ -38,6 +38,7 @@
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#include <linux/mutex.h>
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#include <linux/mtd/ubi.h>
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#include <linux/mtd/mtd.h>
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+#include <linux/export.h>
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#include "ubi-media.h"
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#define err_msg(fmt, ...) \
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@@ -66,6 +67,16 @@ struct gluebi_device {
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static LIST_HEAD(gluebi_devices);
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static DEFINE_MUTEX(devices_mutex);
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+/* Device attribute handler for gluebi files in '/<sysfs>/class/mtd/mtdX' */
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+static ssize_t gluebi_attribute_show(struct device *dev,
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+ struct device_attribute *attr, char *buf);
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+
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+/* Device attributes corresponding to files in '/<sysfs>/class/mtd/mtdX' */
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+static struct device_attribute attr_vol_gluebi_ubi_num =
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+__ATTR(gluebi_ubi_num, S_IRUGO, gluebi_attribute_show, NULL);
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+static struct device_attribute attr_vol_gluebi_vol_id =
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+__ATTR(gluebi_vol_id, S_IRUGO, gluebi_attribute_show, NULL);
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+
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/**
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* find_gluebi_nolock - find a gluebi device.
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* @ubi_num: UBI device number
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@@ -288,6 +299,36 @@ out_err:
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}
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/**
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+ * gluebi_attribute_show - "Show" method for gluebi files in sysfs.
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+ */
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+static ssize_t gluebi_attribute_show(struct device *dev,
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+ struct device_attribute *attr, char *buf)
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+{
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+ int ret;
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+ struct mtd_info *mtd = container_of(dev, struct mtd_info, dev);
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+ struct gluebi_device *gluebi;
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+
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+ gluebi_get_device(mtd);
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+ gluebi = container_of(mtd, struct gluebi_device, mtd);
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+
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+ /* This really shouldn't happen */
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+ if (!gluebi)
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+ return -ENODEV;
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+
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+ if (attr == &attr_vol_gluebi_ubi_num) {
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+ ret = sprintf(buf, "%u\n", gluebi->ubi_num);
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+ } else if (attr == &attr_vol_gluebi_vol_id) {
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+ ret = sprintf(buf, "%u\n", gluebi->vol_id);
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+ } else {
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+ /* This must be a bug */
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+ ret = -EINVAL;
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+ }
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+
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+ gluebi_put_device(mtd);
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+ return ret;
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+}
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+
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+/**
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* gluebi_create - create a gluebi device for an UBI volume.
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* @di: UBI device description object
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* @vi: UBI volume description object
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@@ -355,6 +396,8 @@ static int gluebi_create(struct ubi_devi
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mutex_lock(&devices_mutex);
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list_add_tail(&gluebi->list, &gluebi_devices);
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mutex_unlock(&devices_mutex);
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+ device_create_file(&mtd->dev, &attr_vol_gluebi_ubi_num);
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+ device_create_file(&mtd->dev, &attr_vol_gluebi_vol_id);
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return 0;
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}
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@@ -380,8 +423,11 @@ static int gluebi_remove(struct ubi_volu
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err = -ENOENT;
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} else if (gluebi->refcnt)
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err = -EBUSY;
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- else
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+ else {
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+ device_remove_file(&gluebi->mtd.dev, &attr_vol_gluebi_ubi_num);
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+ device_remove_file(&gluebi->mtd.dev, &attr_vol_gluebi_vol_id);
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list_del(&gluebi->list);
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+ }
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mutex_unlock(&devices_mutex);
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if (err)
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return err;
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