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Subject[RFC][PATCH 03/16] writeback: harmonize writeback threads naming
Date
From: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>

The write-back code mixes words "thread" and "task" for the
same things - this is not a problem, but this is still an
inconsistency which makes it a bit difficult to read the code.

hch: a convention I tend to use and I've seen in various places
is to always use _task for the storage of the task_struct pointer,
and thread everywhere else. This especially helps with having
foo_thread for the actual thread and foo_task for a global
variable keeping the task_struct pointer

This patch renames:

'bdi_add_default_flusher_task()' -> 'bdi_add_default_flusher_thread()'
'bdi_forker_task()' -> 'bdi_forker_thread()'

This is just more consistent, because the per-bdi flushers are
'bdi_writeback_thread()'.

This patch also amends commentaries and makes them refer the forker
thread and the write-back threads as "thread", not "task".

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
---
fs/fs-writeback.c | 2 +-
include/linux/backing-dev.h | 2 +-
mm/backing-dev.c | 26 +++++++++++++-------------
3 files changed, 15 insertions(+), 15 deletions(-)
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index bf10cbf..5e6b7fc 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -840,7 +840,7 @@ int bdi_writeback_thread(void *data)

/*
* Longest period of inactivity that we tolerate. If we
- * see dirty data again later, the task will get
+ * see dirty data again later, the thread will get
* recreated automatically.
*/
max_idle = max(5UL * 60 * HZ, wait_jiffies);
diff --git a/include/linux/backing-dev.h b/include/linux/backing-dev.h
index e536f3a..f0936f5 100644
--- a/include/linux/backing-dev.h
+++ b/include/linux/backing-dev.h
@@ -50,7 +50,7 @@ struct bdi_writeback {

unsigned long last_old_flush; /* last old data flush */

- struct task_struct *task; /* writeback task */
+ struct task_struct *task; /* writeback thread */
struct list_head b_dirty; /* dirty inodes */
struct list_head b_io; /* parked for writeback */
struct list_head b_more_io; /* parked for more writeback */
diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index 0fad60d..b34c12a 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -50,7 +50,7 @@ static struct timer_list sync_supers_timer;
static int bdi_sync_supers(void *);
static void sync_supers_timer_fn(unsigned long);

-static void bdi_add_default_flusher_task(struct backing_dev_info *bdi);
+static void bdi_add_default_flusher_thread(struct backing_dev_info *bdi);

#ifdef CONFIG_DEBUG_FS
#include <linux/debugfs.h>
@@ -279,10 +279,10 @@ static void bdi_flush_io(struct backing_dev_info *bdi)
}

/*
- * kupdated() used to do this. We cannot do it from the bdi_forker_task()
+ * kupdated() used to do this. We cannot do it from the bdi_forker_thread()
* or we risk deadlocking on ->s_umount. The longer term solution would be
* to implement sync_supers_bdi() or similar and simply do it from the
- * bdi writeback tasks individually.
+ * bdi writeback thread individually.
*/
static int bdi_sync_supers(void *unused)
{
@@ -318,7 +318,7 @@ static void sync_supers_timer_fn(unsigned long unused)
bdi_arm_supers_timer();
}

-static int bdi_forker_task(void *ptr)
+static int bdi_forker_thread(void *ptr)
{
struct bdi_writeback *me = ptr;

@@ -354,7 +354,7 @@ static int bdi_forker_task(void *ptr)
!bdi_has_dirty_io(bdi))
continue;

- bdi_add_default_flusher_task(bdi);
+ bdi_add_default_flusher_thread(bdi);
}

set_current_state(TASK_INTERRUPTIBLE);
@@ -376,7 +376,7 @@ static int bdi_forker_task(void *ptr)

/*
* This is our real job - check for pending entries in
- * bdi_pending_list, and create the tasks that got added
+ * bdi_pending_list, and create the threads that got added
*/
bdi = list_entry(bdi_pending_list.next, struct backing_dev_info,
bdi_list);
@@ -387,7 +387,7 @@ static int bdi_forker_task(void *ptr)
wb->task = kthread_run(bdi_writeback_thread, wb, "flush-%s",
dev_name(bdi->dev));
/*
- * If task creation fails, then readd the bdi to
+ * If thread creation fails, then readd the bdi to
* the pending list and force writeout of the bdi
* from this forker thread. That will free some memory
* and we can try again.
@@ -423,10 +423,10 @@ static void bdi_add_to_pending(struct rcu_head *head)
}

/*
- * Add the default flusher task that gets created for any bdi
+ * Add the default flusher thread that gets created for any bdi
* that has dirty data pending writeout
*/
-void static bdi_add_default_flusher_task(struct backing_dev_info *bdi)
+void static bdi_add_default_flusher_thread(struct backing_dev_info *bdi)
{
if (!bdi_cap_writeback_dirty(bdi))
return;
@@ -438,10 +438,10 @@ void static bdi_add_default_flusher_task(struct backing_dev_info *bdi)
}

/*
- * Check with the helper whether to proceed adding a task. Will only
+ * Check with the helper whether to proceed adding a thread. Will only
* abort if we two or more simultanous calls to
- * bdi_add_default_flusher_task() occured, further additions will block
- * waiting for previous additions to finish.
+ * bdi_add_default_flusher_thread() occured, further additions will
+ * block waiting for previous additions to finish.
*/
if (!test_and_set_bit(BDI_pending, &bdi->state)) {
list_del_rcu(&bdi->bdi_list);
@@ -499,7 +499,7 @@ int bdi_register(struct backing_dev_info *bdi, struct device *parent,
if (bdi_cap_flush_forker(bdi)) {
struct bdi_writeback *wb = &bdi->wb;

- wb->task = kthread_run(bdi_forker_task, wb, "bdi-%s",
+ wb->task = kthread_run(bdi_forker_thread, wb, "bdi-%s",
dev_name(dev));
if (IS_ERR(wb->task)) {
wb->task = NULL;
--
1.7.1.1


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