block: add comment on why we save and disable interrupts in flush_plug_list()
[linux-2.6.git] / block / blk-sysfs.c
index 4426739..261c75c 100644 (file)
@@ -2,6 +2,7 @@
  * Functions related to sysfs handling
  */
 #include <linux/kernel.h>
+#include <linux/slab.h>
 #include <linux/module.h>
 #include <linux/bio.h>
 #include <linux/blkdev.h>
@@ -111,9 +112,14 @@ static ssize_t queue_max_segments_show(struct request_queue *q, char *page)
        return queue_var_show(queue_max_segments(q), (page));
 }
 
+static ssize_t queue_max_integrity_segments_show(struct request_queue *q, char *page)
+{
+       return queue_var_show(q->limits.max_integrity_segments, (page));
+}
+
 static ssize_t queue_max_segment_size_show(struct request_queue *q, char *page)
 {
-       if (test_bit(QUEUE_FLAG_CLUSTER, &q->queue_flags))
+       if (blk_queue_cluster(q))
                return queue_var_show(queue_max_segment_size(q), (page));
 
        return queue_var_show(PAGE_CACHE_SIZE, (page));
@@ -179,26 +185,36 @@ 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_nonrot_show(struct request_queue *q, char *page)
-{
-       return queue_var_show(!blk_queue_nonrot(q), page);
+#define QUEUE_SYSFS_BIT_FNS(name, flag, neg)                           \
+static ssize_t                                                         \
+queue_show_##name(struct request_queue *q, char *page)                 \
+{                                                                      \
+       int bit;                                                        \
+       bit = test_bit(QUEUE_FLAG_##flag, &q->queue_flags);             \
+       return queue_var_show(neg ? !bit : bit, page);                  \
+}                                                                      \
+static ssize_t                                                         \
+queue_store_##name(struct request_queue *q, const char *page, size_t count) \
+{                                                                      \
+       unsigned long val;                                              \
+       ssize_t ret;                                                    \
+       ret = queue_var_store(&val, page, count);                       \
+       if (neg)                                                        \
+               val = !val;                                             \
+                                                                       \
+       spin_lock_irq(q->queue_lock);                                   \
+       if (val)                                                        \
+               queue_flag_set(QUEUE_FLAG_##flag, q);                   \
+       else                                                            \
+               queue_flag_clear(QUEUE_FLAG_##flag, q);                 \
+       spin_unlock_irq(q->queue_lock);                                 \
+       return ret;                                                     \
 }
 
-static ssize_t queue_nonrot_store(struct request_queue *q, const char *page,
-                                 size_t count)
-{
-       unsigned long nm;
-       ssize_t ret = queue_var_store(&nm, page, count);
-
-       spin_lock_irq(q->queue_lock);
-       if (nm)
-               queue_flag_clear(QUEUE_FLAG_NONROT, q);
-       else
-               queue_flag_set(QUEUE_FLAG_NONROT, q);
-       spin_unlock_irq(q->queue_lock);
-
-       return ret;
-}
+QUEUE_SYSFS_BIT_FNS(nonrot, NONROT, 1);
+QUEUE_SYSFS_BIT_FNS(random, ADD_RANDOM, 0);
+QUEUE_SYSFS_BIT_FNS(iostats, IO_STAT, 0);
+#undef QUEUE_SYSFS_BIT_FNS
 
 static ssize_t queue_nomerges_show(struct request_queue *q, char *page)
 {
@@ -249,27 +265,6 @@ queue_rq_affinity_store(struct request_queue *q, const char *page, size_t count)
        return ret;
 }
 
-static ssize_t queue_iostats_show(struct request_queue *q, char *page)
-{
-       return queue_var_show(blk_queue_io_stat(q), page);
-}
-
-static ssize_t queue_iostats_store(struct request_queue *q, const char *page,
-                                  size_t count)
-{
-       unsigned long stats;
-       ssize_t ret = queue_var_store(&stats, page, count);
-
-       spin_lock_irq(q->queue_lock);
-       if (stats)
-               queue_flag_set(QUEUE_FLAG_IO_STAT, q);
-       else
-               queue_flag_clear(QUEUE_FLAG_IO_STAT, q);
-       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,
@@ -298,6 +293,11 @@ static struct queue_sysfs_entry queue_max_segments_entry = {
        .show = queue_max_segments_show,
 };
 
+static struct queue_sysfs_entry queue_max_integrity_segments_entry = {
+       .attr = {.name = "max_integrity_segments", .mode = S_IRUGO },
+       .show = queue_max_integrity_segments_show,
+};
+
 static struct queue_sysfs_entry queue_max_segment_size_entry = {
        .attr = {.name = "max_segment_size", .mode = S_IRUGO },
        .show = queue_max_segment_size_show,
@@ -351,8 +351,8 @@ static struct queue_sysfs_entry queue_discard_zeroes_data_entry = {
 
 static struct queue_sysfs_entry queue_nonrot_entry = {
        .attr = {.name = "rotational", .mode = S_IRUGO | S_IWUSR },
-       .show = queue_nonrot_show,
-       .store = queue_nonrot_store,
+       .show = queue_show_nonrot,
+       .store = queue_store_nonrot,
 };
 
 static struct queue_sysfs_entry queue_nomerges_entry = {
@@ -369,8 +369,14 @@ static struct queue_sysfs_entry queue_rq_affinity_entry = {
 
 static struct queue_sysfs_entry queue_iostats_entry = {
        .attr = {.name = "iostats", .mode = S_IRUGO | S_IWUSR },
-       .show = queue_iostats_show,
-       .store = queue_iostats_store,
+       .show = queue_show_iostats,
+       .store = queue_store_iostats,
+};
+
+static struct queue_sysfs_entry queue_random_entry = {
+       .attr = {.name = "add_random", .mode = S_IRUGO | S_IWUSR },
+       .show = queue_show_random,
+       .store = queue_store_random,
 };
 
 static struct attribute *default_attrs[] = {
@@ -379,6 +385,7 @@ static struct attribute *default_attrs[] = {
        &queue_max_hw_sectors_entry.attr,
        &queue_max_sectors_entry.attr,
        &queue_max_segments_entry.attr,
+       &queue_max_integrity_segments_entry.attr,
        &queue_max_segment_size_entry.attr,
        &queue_iosched_entry.attr,
        &queue_hw_sector_size_entry.attr,
@@ -393,6 +400,7 @@ static struct attribute *default_attrs[] = {
        &queue_nomerges_entry.attr,
        &queue_rq_affinity_entry.attr,
        &queue_iostats_entry.attr,
+       &queue_random_entry.attr,
        NULL,
 };
 
@@ -514,6 +522,7 @@ int blk_register_queue(struct gendisk *disk)
                kobject_uevent(&q->kobj, KOBJ_REMOVE);
                kobject_del(&q->kobj);
                blk_trace_remove_sysfs(disk_to_dev(disk));
+               kobject_put(&dev->kobj);
                return ret;
        }