From: Bartlomiej Zolnierkiewicz <bzolnier@xxxxxxxxx>Subject: [PATCH] block: export SSD/non-rotational queue flag through sysfs
For some devices (i.e. CFA ATA) we can't reliably detect whetherthe device is of rotational or non-rotational type so we need toleave the final decision about this setting to the user-space.
Suggested-by: Alan Cox <alan@xxxxxxxxxxxxxxxxxxx>Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@xxxxxxxxx>--- block/blk-sysfs.c | 30 +++++++++++++++++++++++++++++- 1 file changed, 29 insertions(+), 1 deletion(-)
Index: b/block/blk-sysfs.c===================================================================--- a/block/blk-sysfs.c+++ b/block/blk-sysfs.c@@ -130,6 +130,27 @@ static ssize_t queue_max_hw_sectors_show return queue_var_show(max_hw_sectors_kb, (page)); } +static ssize_t queue_nonrot_show(struct request_queue *q, char *page)+{+ return queue_var_show(blk_queue_nonrot(q), page);+}++static ssize_t queue_nonrot_store(struct request_queue *q, const char *page,+ size_t count)+{+ unsigned long nm;+ ssize_t ret = queue_var_store(&nm, page, count);++ spin_lock_irq(q->queue_lock);+ if (nm)+ queue_flag_set(QUEUE_FLAG_NONROT, q);+ else+ queue_flag_clear(QUEUE_FLAG_NONROT, q);+ spin_unlock_irq(q->queue_lock);++ return ret;+}+ static ssize_t queue_nomerges_show(struct request_queue *q, char *page) { return queue_var_show(blk_queue_nomerges(q), page);@@ -146,8 +167,8 @@ static ssize_t queue_nomerges_store(stru queue_flag_set(QUEUE_FLAG_NOMERGES, q); else queue_flag_clear(QUEUE_FLAG_NOMERGES, q);- spin_unlock_irq(q->queue_lock);+ return ret; } @@ -210,6 +231,12 @@ static struct queue_sysfs_entry queue_hw .show = queue_hw_sector_size_show, }; +static struct queue_sysfs_entry queue_nonrot_entry = {+ .attr = {.name = "nonrot", .mode = S_IRUGO | S_IWUSR },+ .show = queue_nonrot_show,+ .store = queue_nonrot_store,+};+ static struct queue_sysfs_entry queue_nomerges_entry = { .attr = {.name = "nomerges", .mode = S_IRUGO | S_IWUSR }, .show = queue_nomerges_show,@@ -229,6 +256,7 @@ static struct attribute *default_attrs[] &queue_max_sectors_entry.attr, &queue_iosched_entry.attr, &queue_hw_sector_size_entry.attr,+ &queue_nonrot_entry.attr, &queue_nomerges_entry.attr, &queue_rq_affinity_entry.attr, NULL, ÿôèº{.nÇ+?·?®??+%?Ëÿ±éݶ¥?wÿº{.nÇ+?·¥?{±þ'^þ)í?æèw* jg¬±¨ ¶????Ý¢jÿ¾«þG«?éÿ¢¸ ¢·¦j:+v?¨?wèjØm¶?ÿþø ¯ù ®w¥þ?àþf£¢·h??â?úÿ?Ù¥
