* Set/store functions in block/blk-ledtrig.c * Add device attributes to disk_attrs in block/genhd.c Signed-off-by: Ian Pilcher <arequipeno@gmail.com> --- block/blk-ledtrig.c | 65 +++++++++++++++++++++++++++++++++++++++++++++ block/blk-ledtrig.h | 8 ++++++ block/genhd.c | 9 +++++++ 3 files changed, 82 insertions(+) diff --git a/block/blk-ledtrig.c b/block/blk-ledtrig.c index 7c8fdff88683..2d324df45149 100644 --- a/block/blk-ledtrig.c +++ b/block/blk-ledtrig.c @@ -479,3 +479,68 @@ bool blk_ledtrig_clear(struct gendisk *const gd) return changed; } EXPORT_SYMBOL_GPL(blk_ledtrig_clear); + + +/* + * + * Set, clear & show LED triggers via sysfs device attributes + * + * (See dev_attr_led_trigger and disk_attrs in genhd.c) + * + */ + +ssize_t blk_ledtrig_devattr_store(struct device *const dev, + struct device_attribute *const attr, + const char *const buf, const size_t count) +{ + struct gendisk *const gd = dev_to_disk(dev); + const char *const name = blk_ledtrig_skip_whitespace(buf); + const char *const endp = blk_ledtrig_find_whitespace(name); + const ptrdiff_t name_len = endp - name; // always >= 0 + int ret; + + if (name_len == 0) + ret = blk_ledtrig_clear(gd); + else + ret = __blk_ledtrig_set(gd, name, name_len); + + if (ret < 0) + return ret; + + return blk_ledtrig_skip_whitespace(endp) - buf; +} + +ssize_t blk_ledtrig_devattr_show(struct device *const dev, + struct device_attribute *const attr, + char *const buf) +{ + struct gendisk *const gd = dev_to_disk(dev); + const struct blk_ledtrig *t; + size_t name_len; + int ret; + + ret = mutex_lock_interruptible(&gd->ledtrig_mutex); + if (unlikely(ret != 0)) + return ret; + + t = gd->ledtrig; + + if (t != NULL) { + name_len = strlen(t->name); + if (likely(name_len < PAGE_SIZE - 1)) + memcpy(buf, t->name, name_len); + } + + mutex_unlock(&gd->ledtrig_mutex); + + if (t == NULL) + return sprintf(buf, "(none)\n"); + + if (unlikely(name_len >= PAGE_SIZE - 1)) + return -EOVERFLOW; + + buf[name_len] = '\n'; + buf[name_len + 1] = 0; + + return (ssize_t)(name_len + 1); +} diff --git a/block/blk-ledtrig.h b/block/blk-ledtrig.h index 9b718d45783f..5d228905edbf 100644 --- a/block/blk-ledtrig.h +++ b/block/blk-ledtrig.h @@ -19,6 +19,14 @@ static inline void blk_ledtrig_disk_init(struct gendisk *const gd) mutex_init(&gd->ledtrig_mutex); } +ssize_t blk_ledtrig_devattr_store(struct device *const dev, + struct device_attribute *const attr, + const char *const buf, const size_t count); + +ssize_t blk_ledtrig_devattr_show(struct device *const dev, + struct device_attribute *const attr, + char *const buf); + #else // CONFIG_BLK_LED_TRIGGERS static inline void blk_ledtrig_init(void) {} diff --git a/block/genhd.c b/block/genhd.c index fb1617f21d79..fd37efe74d48 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -1014,6 +1014,12 @@ static struct device_attribute dev_attr_fail_timeout = __ATTR(io-timeout-fail, 0644, part_timeout_show, part_timeout_store); #endif +#ifdef CONFIG_BLK_LED_TRIGGERS +static struct device_attribute dev_attr_led_trigger = + __ATTR(led_trigger, 0644, + blk_ledtrig_devattr_show, blk_ledtrig_devattr_store); +#endif + static struct attribute *disk_attrs[] = { &dev_attr_range.attr, &dev_attr_ext_range.attr, @@ -1035,6 +1041,9 @@ static struct attribute *disk_attrs[] = { #endif #ifdef CONFIG_FAIL_IO_TIMEOUT &dev_attr_fail_timeout.attr, +#endif +#ifdef CONFIG_BLK_LED_TRIGGERS + &dev_attr_led_trigger.attr, #endif NULL }; -- 2.31.1