Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=563063a808de6b2004d5b8a09ddcb6125481f4b2
Commit: 563063a808de6b2004d5b8a09ddcb6125481f4b2
Parent: 70eb8040dc81212c884a464b75e37dca8014f3ad
Author: Jens Axboe <[EMAIL PROTECTED]>
AuthorDate: Thu May 10 13:29:51 2007 +0200
Committer: Jens Axboe <[EMAIL PROTECTED]>
CommitDate: Tue Oct 16 11:08:53 2007 +0200
ll_rw_blk: temporarily enable max_segments tweaking
Expose this setting for now, so that users can play with enabling
large commands without defaulting it to on globally. This is a debug
patch, it will be dropped for the final versions.
Signed-off-by: Jens Axboe <[EMAIL PROTECTED]>
---
block/ll_rw_blk.c | 23 +++++++++++++++++++++++
1 files changed, 23 insertions(+), 0 deletions(-)
diff --git a/block/ll_rw_blk.c b/block/ll_rw_blk.c
index 36d2051..527bd8d 100644
--- a/block/ll_rw_blk.c
+++ b/block/ll_rw_blk.c
@@ -4072,7 +4072,23 @@ static ssize_t queue_max_hw_sectors_show(struct
request_queue *q, char *page)
return queue_var_show(max_hw_sectors_kb, (page));
}
+static ssize_t queue_max_segments_show(struct request_queue *q, char *page)
+{
+ return queue_var_show(q->max_phys_segments, page);
+}
+
+static ssize_t queue_max_segments_store(struct request_queue *q,
+ const char *page, size_t count)
+{
+ unsigned long segments;
+ ssize_t ret = queue_var_store(&segments, page, count);
+ spin_lock_irq(q->queue_lock);
+ q->max_phys_segments = segments;
+ spin_unlock_irq(q->queue_lock);
+
+ return ret;
+}
static struct queue_sysfs_entry queue_requests_entry = {
.attr = {.name = "nr_requests", .mode = S_IRUGO | S_IWUSR },
.show = queue_requests_show,
@@ -4096,6 +4112,12 @@ static struct queue_sysfs_entry
queue_max_hw_sectors_entry = {
.show = queue_max_hw_sectors_show,
};
+static struct queue_sysfs_entry queue_max_segments_entry = {
+ .attr = {.name = "max_segments", .mode = S_IRUGO | S_IWUSR },
+ .show = queue_max_segments_show,
+ .store = queue_max_segments_store,
+};
+
static struct queue_sysfs_entry queue_iosched_entry = {
.attr = {.name = "scheduler", .mode = S_IRUGO | S_IWUSR },
.show = elv_iosched_show,
@@ -4107,6 +4129,7 @@ static struct attribute *default_attrs[] = {
&queue_ra_entry.attr,
&queue_max_hw_sectors_entry.attr,
&queue_max_sectors_entry.attr,
+ &queue_max_segments_entry.attr,
&queue_iosched_entry.attr,
NULL,
};
-
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