block: Implement support for WRITE SAME

[GitHub/mt8127/android_kernel_alcatel_ttab.git] / block / blk-sysfs.c

diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index ea51d827a0bb5cd7064b485d3b1dbe13e841c34d..247dbfd42621bb5222217683e00e279da6a002d2 100644 (file)
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -180,6 +180,13 @@ static ssize_t queue_discard_zeroes_data_show(struct request_queue *q, char *pag
        return queue_var_show(queue_discard_zeroes_data(q), page);
 }
 
+static ssize_t queue_write_same_max_show(struct request_queue *q, char *page)
+{
+       return sprintf(page, "%llu\n",
+               (unsigned long long)q->limits.max_write_same_sectors << 9);
+}
+
+
 static ssize_t
 queue_max_sectors_store(struct request_queue *q, const char *page, size_t count)
 {
@@ -385,6 +392,11 @@ static struct queue_sysfs_entry queue_discard_zeroes_data_entry = {
        .show = queue_discard_zeroes_data_show,
 };
 
+static struct queue_sysfs_entry queue_write_same_max_entry = {
+       .attr = {.name = "write_same_max_bytes", .mode = S_IRUGO },
+       .show = queue_write_same_max_show,
+};
+
 static struct queue_sysfs_entry queue_nonrot_entry = {
        .attr = {.name = "rotational", .mode = S_IRUGO | S_IWUSR },
        .show = queue_show_nonrot,
@@ -432,6 +444,7 @@ static struct attribute *default_attrs[] = {
        &queue_discard_granularity_entry.attr,
        &queue_discard_max_entry.attr,
        &queue_discard_zeroes_data_entry.attr,
+       &queue_write_same_max_entry.attr,
        &queue_nonrot_entry.attr,
        &queue_nomerges_entry.attr,
        &queue_rq_affinity_entry.attr,