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authorMartin K. Petersen <martin.petersen@oracle.com>2010-03-10 00:48:33 -0500
committerJens Axboe <jens.axboe@oracle.com>2010-03-15 07:48:00 -0400
commitc77a5710b7e23847bfdb81fcaa10b585f65c960a (patch)
tree52a09887c6396d71545e321f508a511cfb9cdb0f /block/blk-sysfs.c
parentee714f2dd33e726346e34f5cda12543162f4753e (diff)
block: Export max number of segments and max segment size in sysfs
These two values are useful when debugging issues surrounding maximum I/O size. Put them in sysfs with the rest of the queue limits. 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.c25
1 files changed, 25 insertions, 0 deletions
diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index e85442415db3..fad86550255a 100644
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -106,6 +106,19 @@ static ssize_t queue_max_sectors_show(struct request_queue *q, char *page)
106 return queue_var_show(max_sectors_kb, (page)); 106 return queue_var_show(max_sectors_kb, (page));
107} 107}
108 108
109static ssize_t queue_max_segments_show(struct request_queue *q, char *page)
110{
111 return queue_var_show(queue_max_segments(q), (page));
112}
113
114static ssize_t queue_max_segment_size_show(struct request_queue *q, char *page)
115{
116 if (test_bit(QUEUE_FLAG_CLUSTER, &q->queue_flags))
117 return queue_var_show(queue_max_segment_size(q), (page));
118
119 return queue_var_show(PAGE_CACHE_SIZE, (page));
120}
121
109static ssize_t queue_logical_block_size_show(struct request_queue *q, char *page) 122static ssize_t queue_logical_block_size_show(struct request_queue *q, char *page)
110{ 123{
111 return queue_var_show(queue_logical_block_size(q), page); 124 return queue_var_show(queue_logical_block_size(q), page);
@@ -280,6 +293,16 @@ static struct queue_sysfs_entry queue_max_hw_sectors_entry = {
280 .show = queue_max_hw_sectors_show, 293 .show = queue_max_hw_sectors_show,
281}; 294};
282 295
296static struct queue_sysfs_entry queue_max_segments_entry = {
297 .attr = {.name = "max_segments", .mode = S_IRUGO },
298 .show = queue_max_segments_show,
299};
300
301static struct queue_sysfs_entry queue_max_segment_size_entry = {
302 .attr = {.name = "max_segment_size", .mode = S_IRUGO },
303 .show = queue_max_segment_size_show,
304};
305
283static struct queue_sysfs_entry queue_iosched_entry = { 306static struct queue_sysfs_entry queue_iosched_entry = {
284 .attr = {.name = "scheduler", .mode = S_IRUGO | S_IWUSR }, 307 .attr = {.name = "scheduler", .mode = S_IRUGO | S_IWUSR },
285 .show = elv_iosched_show, 308 .show = elv_iosched_show,
@@ -355,6 +378,8 @@ static struct attribute *default_attrs[] = {
355 &queue_ra_entry.attr, 378 &queue_ra_entry.attr,
356 &queue_max_hw_sectors_entry.attr, 379 &queue_max_hw_sectors_entry.attr,
357 &queue_max_sectors_entry.attr, 380 &queue_max_sectors_entry.attr,
381 &queue_max_segments_entry.attr,
382 &queue_max_segment_size_entry.attr,
358 &queue_iosched_entry.attr, 383 &queue_iosched_entry.attr,
359 &queue_hw_sector_size_entry.attr, 384 &queue_hw_sector_size_entry.attr,
360 &queue_logical_block_size_entry.attr, 385 &queue_logical_block_size_entry.attr,