/*
* See Documentation/block/deadline-iosched.txt
*/
-static int read_expire = HZ / 2; /* max time before a read is submitted. */
-static int write_expire = 5 * HZ; /* ditto for writes, these limits are SOFT! */
-static int writes_starved = 2; /* max times reads can starve a write */
-static int fifo_batch = 16; /* # of sequential requests treated as one
+static const int read_expire = HZ / 2; /* max time before a read is submitted. */
+static const int write_expire = 5 * HZ; /* ditto for writes, these limits are SOFT! */
+static const int writes_starved = 2; /* max times reads can starve a write */
+static const int fifo_batch = 16; /* # of sequential requests treated as one
by the above parameters. For throughput. */
static const int deadline_hash_shift = 5;
/*
* sysfs parts below
*/
-struct deadline_fs_entry {
- struct attribute attr;
- ssize_t (*show)(struct deadline_data *, char *);
- ssize_t (*store)(struct deadline_data *, const char *, size_t);
-};
static ssize_t
deadline_var_show(int var, char *page)
}
#define SHOW_FUNCTION(__FUNC, __VAR, __CONV) \
-static ssize_t __FUNC(struct deadline_data *dd, char *page) \
+static ssize_t __FUNC(elevator_t *e, char *page) \
{ \
- int __data = __VAR; \
+ struct deadline_data *dd = e->elevator_data; \
+ int __data = __VAR; \
if (__CONV) \
__data = jiffies_to_msecs(__data); \
return deadline_var_show(__data, (page)); \
}
-SHOW_FUNCTION(deadline_readexpire_show, dd->fifo_expire[READ], 1);
-SHOW_FUNCTION(deadline_writeexpire_show, dd->fifo_expire[WRITE], 1);
-SHOW_FUNCTION(deadline_writesstarved_show, dd->writes_starved, 0);
-SHOW_FUNCTION(deadline_frontmerges_show, dd->front_merges, 0);
-SHOW_FUNCTION(deadline_fifobatch_show, dd->fifo_batch, 0);
+SHOW_FUNCTION(deadline_read_expire_show, dd->fifo_expire[READ], 1);
+SHOW_FUNCTION(deadline_write_expire_show, dd->fifo_expire[WRITE], 1);
+SHOW_FUNCTION(deadline_writes_starved_show, dd->writes_starved, 0);
+SHOW_FUNCTION(deadline_front_merges_show, dd->front_merges, 0);
+SHOW_FUNCTION(deadline_fifo_batch_show, dd->fifo_batch, 0);
#undef SHOW_FUNCTION
#define STORE_FUNCTION(__FUNC, __PTR, MIN, MAX, __CONV) \
-static ssize_t __FUNC(struct deadline_data *dd, const char *page, size_t count) \
+static ssize_t __FUNC(elevator_t *e, const char *page, size_t count) \
{ \
+ struct deadline_data *dd = e->elevator_data; \
int __data; \
int ret = deadline_var_store(&__data, (page), count); \
if (__data < (MIN)) \
*(__PTR) = __data; \
return ret; \
}
-STORE_FUNCTION(deadline_readexpire_store, &dd->fifo_expire[READ], 0, INT_MAX, 1);
-STORE_FUNCTION(deadline_writeexpire_store, &dd->fifo_expire[WRITE], 0, INT_MAX, 1);
-STORE_FUNCTION(deadline_writesstarved_store, &dd->writes_starved, INT_MIN, INT_MAX, 0);
-STORE_FUNCTION(deadline_frontmerges_store, &dd->front_merges, 0, 1, 0);
-STORE_FUNCTION(deadline_fifobatch_store, &dd->fifo_batch, 0, INT_MAX, 0);
+STORE_FUNCTION(deadline_read_expire_store, &dd->fifo_expire[READ], 0, INT_MAX, 1);
+STORE_FUNCTION(deadline_write_expire_store, &dd->fifo_expire[WRITE], 0, INT_MAX, 1);
+STORE_FUNCTION(deadline_writes_starved_store, &dd->writes_starved, INT_MIN, INT_MAX, 0);
+STORE_FUNCTION(deadline_front_merges_store, &dd->front_merges, 0, 1, 0);
+STORE_FUNCTION(deadline_fifo_batch_store, &dd->fifo_batch, 0, INT_MAX, 0);
#undef STORE_FUNCTION
-static struct deadline_fs_entry deadline_readexpire_entry = {
- .attr = {.name = "read_expire", .mode = S_IRUGO | S_IWUSR },
- .show = deadline_readexpire_show,
- .store = deadline_readexpire_store,
-};
-static struct deadline_fs_entry deadline_writeexpire_entry = {
- .attr = {.name = "write_expire", .mode = S_IRUGO | S_IWUSR },
- .show = deadline_writeexpire_show,
- .store = deadline_writeexpire_store,
-};
-static struct deadline_fs_entry deadline_writesstarved_entry = {
- .attr = {.name = "writes_starved", .mode = S_IRUGO | S_IWUSR },
- .show = deadline_writesstarved_show,
- .store = deadline_writesstarved_store,
-};
-static struct deadline_fs_entry deadline_frontmerges_entry = {
- .attr = {.name = "front_merges", .mode = S_IRUGO | S_IWUSR },
- .show = deadline_frontmerges_show,
- .store = deadline_frontmerges_store,
-};
-static struct deadline_fs_entry deadline_fifobatch_entry = {
- .attr = {.name = "fifo_batch", .mode = S_IRUGO | S_IWUSR },
- .show = deadline_fifobatch_show,
- .store = deadline_fifobatch_store,
-};
-
-static struct attribute *default_attrs[] = {
- &deadline_readexpire_entry.attr,
- &deadline_writeexpire_entry.attr,
- &deadline_writesstarved_entry.attr,
- &deadline_frontmerges_entry.attr,
- &deadline_fifobatch_entry.attr,
- NULL,
-};
-
-#define to_deadline(atr) container_of((atr), struct deadline_fs_entry, attr)
-
-static ssize_t
-deadline_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
-{
- elevator_t *e = container_of(kobj, elevator_t, kobj);
- struct deadline_fs_entry *entry = to_deadline(attr);
-
- if (!entry->show)
- return -EIO;
-
- return entry->show(e->elevator_data, page);
-}
-
-static ssize_t
-deadline_attr_store(struct kobject *kobj, struct attribute *attr,
- const char *page, size_t length)
-{
- elevator_t *e = container_of(kobj, elevator_t, kobj);
- struct deadline_fs_entry *entry = to_deadline(attr);
-
- if (!entry->store)
- return -EIO;
-
- return entry->store(e->elevator_data, page, length);
-}
-
-static struct sysfs_ops deadline_sysfs_ops = {
- .show = deadline_attr_show,
- .store = deadline_attr_store,
-};
-
-static struct kobj_type deadline_ktype = {
- .sysfs_ops = &deadline_sysfs_ops,
- .default_attrs = default_attrs,
+#define DD_ATTR(name) \
+ __ATTR(name, S_IRUGO|S_IWUSR, deadline_##name##_show, \
+ deadline_##name##_store)
+
+static struct elv_fs_entry deadline_attrs[] = {
+ DD_ATTR(read_expire),
+ DD_ATTR(write_expire),
+ DD_ATTR(writes_starved),
+ DD_ATTR(front_merges),
+ DD_ATTR(fifo_batch),
+ __ATTR_NULL
};
static struct elevator_type iosched_deadline = {
.elevator_exit_fn = deadline_exit_queue,
},
- .elevator_ktype = &deadline_ktype,
+ .elevator_attrs = deadline_attrs,
.elevator_name = "deadline",
.elevator_owner = THIS_MODULE,
};