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authorMartin K. Petersen <martin.petersen@oracle.com>2009-11-10 11:50:21 +0100
committerJens Axboe <jens.axboe@oracle.com>2009-11-10 11:50:21 +0100
commit86b37281411cf1e9bc0a6b5406c45edb7bd9ea5d (patch)
tree729db57dd52054af1bc16b4afb131093dfc9d255 /block/blk-sysfs.c
parentcf7c25cf91f632a3528669fc0876e1fc8355ff9b (diff)
downloadlinux-stericsson-86b37281411cf1e9bc0a6b5406c45edb7bd9ea5d.tar.gz
block: Expose discard granularity
While SSDs track block usage on a per-sector basis, RAID arrays often have allocation blocks that are bigger. Allow the discard granularity and alignment to be set and teach the topology stacking logic how to handle them. Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'block/blk-sysfs.c')
-rw-r--r--block/blk-sysfs.c22
1 files changed, 22 insertions, 0 deletions
diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index 8a6d81afb284..3147145edc15 100644
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -126,6 +126,16 @@ 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_granularity_show(struct request_queue *q, char *page)
+{
+ return queue_var_show(q->limits.discard_granularity, page);
+}
+
+static ssize_t queue_discard_max_show(struct request_queue *q, char *page)
+{
+ return queue_var_show(q->limits.max_discard_sectors << 9, page);
+}
+
static ssize_t
queue_max_sectors_store(struct request_queue *q, const char *page, size_t count)
{
@@ -293,6 +303,16 @@ static struct queue_sysfs_entry queue_io_opt_entry = {
.show = queue_io_opt_show,
};
+static struct queue_sysfs_entry queue_discard_granularity_entry = {
+ .attr = {.name = "discard_granularity", .mode = S_IRUGO },
+ .show = queue_discard_granularity_show,
+};
+
+static struct queue_sysfs_entry queue_discard_max_entry = {
+ .attr = {.name = "discard_max_bytes", .mode = S_IRUGO },
+ .show = queue_discard_max_show,
+};
+
static struct queue_sysfs_entry queue_nonrot_entry = {
.attr = {.name = "rotational", .mode = S_IRUGO | S_IWUSR },
.show = queue_nonrot_show,
@@ -328,6 +348,8 @@ static struct attribute *default_attrs[] = {
&queue_physical_block_size_entry.attr,
&queue_io_min_entry.attr,
&queue_io_opt_entry.attr,
+ &queue_discard_granularity_entry.attr,
+ &queue_discard_max_entry.attr,
&queue_nonrot_entry.attr,
&queue_nomerges_entry.attr,
&queue_rq_affinity_entry.attr,