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