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Date: Tue, 6 Jan 2015 16:26:10 -0500
From: Tejun Heo <tj@...nel.org>
To: axboe@...nel.dk
Cc: linux-kernel@...r.kernel.org, jack@...e.cz, hch@...radead.org,
hannes@...xchg.org, linux-fsdevel@...r.kernel.org,
vgoyal@...hat.com, lizefan@...wei.com, cgroups@...r.kernel.org,
linux-mm@...ck.org, mhocko@...e.cz, clm@...com,
fengguang.wu@...el.com, david@...morbit.com,
Tejun Heo <tj@...nel.org>
Subject: [PATCH 33/45] writeback: minor reorganization of fs/fs-writeback.c
Move iwbl_{move|del}_locked() and __inode_wait_for_writeback() upwards
before #ifdef CONFIG_CGROUP_WRITEBACK block and make separate
identical copies of __inode_wait_for_writeback() in the #ifdef and
#else branches. The relocation and two copies will help following
cgroup writeback changes.
This is pure reorganization.
Signed-off-by: Tejun Heo <tj@...nel.org>
Cc: Jens Axboe <axboe@...nel.dk>
Cc: Jan Kara <jack@...e.cz>
---
fs/fs-writeback.c | 199 ++++++++++++++++++++++++++++++------------------------
1 file changed, 109 insertions(+), 90 deletions(-)
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index 6851088..ab77ed2 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -132,6 +132,75 @@ static void wb_wait_for_completion(struct backing_dev_info *bdi,
wait_event(bdi->wb_waitq, !atomic_read(&done->cnt));
}
+/**
+ * iwbl_move_locked - move an inode_wb_link onto a bdi_writeback IO list
+ * @iwbl: inode_wb_link to be moved
+ * @wb: target bdi_writeback
+ * @head: one of @wb->b_{dirty|io|more_io}
+ *
+ * Move @iwbl->dirty_list to @list of @wb and set %WB_has_dirty_io.
+ * Returns %true if all IO lists were empty before; otherwise, %false.
+ */
+static bool iwbl_move_locked(struct inode_wb_link *iwbl,
+ struct bdi_writeback *wb, struct list_head *head)
+{
+ assert_spin_locked(&wb->list_lock);
+
+ list_move(&iwbl->dirty_list, head);
+
+ if (wb_has_dirty_io(wb)) {
+ return false;
+ } else {
+ set_bit(WB_has_dirty_io, &wb->state);
+ WARN_ON_ONCE(!wb->avg_write_bandwidth);
+ atomic_long_add(wb->avg_write_bandwidth,
+ &wb->bdi->tot_write_bandwidth);
+ return true;
+ }
+}
+
+/**
+ * iwbl_del_locked - remove an inode_wb_link from its bdi_writeback IO list
+ * @iwbl: inode_wb_link to be removed
+ * @wb: bdi_writeback @inode is being removed from
+ *
+ * Remove @iwbl which may be on one of @wb->b_{dirty|io|more_io} lists and
+ * clear %WB_has_dirty_io if all are empty afterwards.
+ */
+static void iwbl_del_locked(struct inode_wb_link *iwbl,
+ struct bdi_writeback *wb)
+{
+ assert_spin_locked(&wb->list_lock);
+
+ list_del_init(&iwbl->dirty_list);
+
+ if (wb_has_dirty_io(wb) && list_empty(&wb->b_dirty) &&
+ list_empty(&wb->b_io) && list_empty(&wb->b_more_io)) {
+ clear_bit(WB_has_dirty_io, &wb->state);
+ WARN_ON_ONCE(atomic_long_sub_return(wb->avg_write_bandwidth,
+ &wb->bdi->tot_write_bandwidth) < 0);
+ }
+}
+
+/*
+ * Wait for writeback on an inode to complete. Called with i_lock held.
+ * Caller must make sure inode cannot go away when we drop i_lock.
+ */
+static void __inode_wait_for_writeback(struct inode *inode)
+ __releases(inode->i_lock)
+ __acquires(inode->i_lock)
+{
+ DEFINE_WAIT_BIT(wq, &inode->i_state, __I_SYNC);
+ wait_queue_head_t *wqh;
+
+ wqh = bit_waitqueue(&inode->i_state, __I_SYNC);
+ while (inode->i_state & I_SYNC) {
+ spin_unlock(&inode->i_lock);
+ __wait_on_bit(wqh, &wq, bit_wait, TASK_UNINTERRUPTIBLE);
+ spin_lock(&inode->i_lock);
+ }
+}
+
#ifdef CONFIG_CGROUP_WRITEBACK
/**
@@ -331,6 +400,26 @@ restart:
rcu_read_unlock();
}
+/*
+ * Sleep until I_SYNC is cleared. This function must be called with i_lock
+ * held and drops it. It is aimed for callers not holding any inode reference
+ * so once i_lock is dropped, inode can go away.
+ */
+static void inode_sleep_on_writeback(struct inode *inode)
+ __releases(inode->i_lock)
+{
+ DEFINE_WAIT(wait);
+ wait_queue_head_t *wqh = bit_waitqueue(&inode->i_state, __I_SYNC);
+ int sleep;
+
+ prepare_to_wait(wqh, &wait, TASK_UNINTERRUPTIBLE);
+ sleep = inode->i_state & I_SYNC;
+ spin_unlock(&inode->i_lock);
+ if (sleep)
+ schedule();
+ finish_wait(wqh, &wait);
+}
+
#else /* CONFIG_CGROUP_WRITEBACK */
static void init_cgwb_dirty_page_context(struct dirty_context *dctx)
@@ -358,6 +447,26 @@ static void bdi_split_work_to_wbs(struct backing_dev_info *bdi,
}
}
+/*
+ * Sleep until I_SYNC is cleared. This function must be called with i_lock
+ * held and drops it. It is aimed for callers not holding any inode reference
+ * so once i_lock is dropped, inode can go away.
+ */
+static void inode_sleep_on_writeback(struct inode *inode)
+ __releases(inode->i_lock)
+{
+ DEFINE_WAIT(wait);
+ wait_queue_head_t *wqh = bit_waitqueue(&inode->i_state, __I_SYNC);
+ int sleep;
+
+ prepare_to_wait(wqh, &wait, TASK_UNINTERRUPTIBLE);
+ sleep = inode->i_state & I_SYNC;
+ spin_unlock(&inode->i_lock);
+ if (sleep)
+ schedule();
+ finish_wait(wqh, &wait);
+}
+
#endif /* CONFIG_CGROUP_WRITEBACK */
/**
@@ -451,56 +560,6 @@ void wb_start_background_writeback(struct bdi_writeback *wb)
wb_wakeup(wb);
}
-/**
- * iwbl_move_locked - move an inode_wb_link onto a bdi_writeback IO list
- * @iwbl: inode_wb_link to be moved
- * @wb: target bdi_writeback
- * @head: one of @wb->b_{dirty|io|more_io}
- *
- * Move @iwbl->dirty_list to @list of @wb and set %WB_has_dirty_io.
- * Returns %true if all IO lists were empty before; otherwise, %false.
- */
-static bool iwbl_move_locked(struct inode_wb_link *iwbl,
- struct bdi_writeback *wb, struct list_head *head)
-{
- assert_spin_locked(&wb->list_lock);
-
- list_move(&iwbl->dirty_list, head);
-
- if (wb_has_dirty_io(wb)) {
- return false;
- } else {
- set_bit(WB_has_dirty_io, &wb->state);
- WARN_ON_ONCE(!wb->avg_write_bandwidth);
- atomic_long_add(wb->avg_write_bandwidth,
- &wb->bdi->tot_write_bandwidth);
- return true;
- }
-}
-
-/**
- * iwbl_del_locked - remove an inode_wb_link from its bdi_writeback IO list
- * @iwbl: inode_wb_link to be removed
- * @wb: bdi_writeback @inode is being removed from
- *
- * Remove @iwbl which may be on one of @wb->b_{dirty|io|more_io} lists and
- * clear %WB_has_dirty_io if all are empty afterwards.
- */
-static void iwbl_del_locked(struct inode_wb_link *iwbl,
- struct bdi_writeback *wb)
-{
- assert_spin_locked(&wb->list_lock);
-
- list_del_init(&iwbl->dirty_list);
-
- if (wb_has_dirty_io(wb) && list_empty(&wb->b_dirty) &&
- list_empty(&wb->b_io) && list_empty(&wb->b_more_io)) {
- clear_bit(WB_has_dirty_io, &wb->state);
- WARN_ON_ONCE(atomic_long_sub_return(wb->avg_write_bandwidth,
- &wb->bdi->tot_write_bandwidth) < 0);
- }
-}
-
/*
* Remove the inode from the writeback list it is on.
*/
@@ -657,26 +716,6 @@ static int write_inode(struct inode *inode, struct writeback_control *wbc)
}
/*
- * Wait for writeback on an inode to complete. Called with i_lock held.
- * Caller must make sure inode cannot go away when we drop i_lock.
- */
-static void __inode_wait_for_writeback(struct inode *inode)
- __releases(inode->i_lock)
- __acquires(inode->i_lock)
-{
- DEFINE_WAIT_BIT(wq, &inode->i_state, __I_SYNC);
- wait_queue_head_t *wqh;
-
- wqh = bit_waitqueue(&inode->i_state, __I_SYNC);
- while (inode->i_state & I_SYNC) {
- spin_unlock(&inode->i_lock);
- __wait_on_bit(wqh, &wq, bit_wait,
- TASK_UNINTERRUPTIBLE);
- spin_lock(&inode->i_lock);
- }
-}
-
-/*
* Wait for writeback on an inode to complete. Caller must have inode pinned.
*/
void inode_wait_for_writeback(struct inode *inode)
@@ -687,26 +726,6 @@ void inode_wait_for_writeback(struct inode *inode)
}
/*
- * Sleep until I_SYNC is cleared. This function must be called with i_lock
- * held and drops it. It is aimed for callers not holding any inode reference
- * so once i_lock is dropped, inode can go away.
- */
-static void inode_sleep_on_writeback(struct inode *inode)
- __releases(inode->i_lock)
-{
- DEFINE_WAIT(wait);
- wait_queue_head_t *wqh = bit_waitqueue(&inode->i_state, __I_SYNC);
- int sleep;
-
- prepare_to_wait(wqh, &wait, TASK_UNINTERRUPTIBLE);
- sleep = inode->i_state & I_SYNC;
- spin_unlock(&inode->i_lock);
- if (sleep)
- schedule();
- finish_wait(wqh, &wait);
-}
-
-/*
* Find proper writeback list for the inode depending on its current state and
* possibly also change of its state while we were doing writeback. Here we
* handle things such as livelock prevention or fairness of writeback among
--
2.1.0
--
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