[PATCH v2 1/3] block: add sysfs entry for discard_alignment

Paolo Bonzini
2012-07-02T13:20:36Z

The next patches will actually use the alignment, expose it in sysfs
for ease of debugging.

Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
block/blk-sysfs.c | 11 +++++++++++
1 files changed, 11 insertions(+), 0 deletions(-)

diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index aa41b47..95e919c 100644
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -146,6 +146,11 @@ static ssize_t queue_io_opt_show(struct request_queue *q, char *page)
return queue_var_show(queue_io_opt(q), page);
}

+static ssize_t queue_discard_alignment_show(struct request_queue *q, char *page)
+{
+ return queue_var_show(q->limits.discard_alignment, page);
+}
+
static ssize_t queue_discard_granularity_show(struct request_queue *q, char *page)
{
return queue_var_show(q->limits.discard_granularity, page);
@@ -343,6 +348,11 @@ static struct queue_sysfs_entry queue_io_opt_entry = {
.show = queue_io_opt_show,
};

+static struct queue_sysfs_entry queue_discard_alignment_entry = {
+ .attr = {.name = "discard_alignment", .mode = S_IRUGO },
+ .show = queue_discard_alignment_show,
+};
+
static struct queue_sysfs_entry queue_discard_granularity_entry = {
.attr = {.name = "discard_granularity", .mode = S_IRUGO },
.show = queue_discard_granularity_show,
@@ -403,6 +413,7 @@ static struct attribute *default_attrs[] = {
&queue_io_min_entry.attr,
&queue_io_opt_entry.attr,
&queue_discard_granularity_entry.attr,
+ &queue_discard_alignment_entry.attr,
&queue_discard_max_entry.attr,
&queue_discard_zeroes_data_entry.attr,
&queue_nonrot_entry.attr,
--
1.7.1