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Merge branch 'for-3.10/core' of git://git.kernel.dk/linux-block

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Pull block core updates from Jens Axboe:

 - Major bit is Kents prep work for immutable bio vecs.

 - Stable candidate fix for a scheduling-while-atomic in the queue
   bypass operation.

 - Fix for the hang on exceeded rq->datalen 32-bit unsigned when merging
   discard bios.

 - Tejuns changes to convert the writeback thread pool to the generic
   workqueue mechanism.

 - Runtime PM framework, SCSI patches exists on top of these in James'
   tree.

 - A few random fixes.

* 'for-3.10/core' of git://git.kernel.dk/linux-block: (40 commits)
  relay: move remove_buf_file inside relay_close_buf
  partitions/efi.c: replace useless kzalloc's by kmalloc's
  fs/block_dev.c: fix iov_shorten() criteria in blkdev_aio_read()
  block: fix max discard sectors limit
  blkcg: fix "scheduling while atomic" in blk_queue_bypass_start
  Documentation: cfq-iosched: update documentation help for cfq tunables
  writeback: expose the bdi_wq workqueue
  writeback: replace custom worker pool implementation with unbound workqueue
  writeback: remove unused bdi_pending_list
  aoe: Fix unitialized var usage
  bio-integrity: Add explicit field for owner of bip_buf
  block: Add an explicit bio flag for bios that own their bvec
  block: Add bio_alloc_pages()
  block: Convert some code to bio_for_each_segment_all()
  block: Add bio_for_each_segment_all()
  bounce: Refactor __blk_queue_bounce to not use bi_io_vec
  raid1: use bio_copy_data()
  pktcdvd: Use bio_reset() in disabled code to kill bi_idx usage
  pktcdvd: use bio_copy_data()
  block: Add bio_copy_data()
  ...
This commit is contained in:
Linus Torvalds
2013-05-08 10:13:35 -07:00
parent 5af43c24ca b8d4a5bf6a
commit 4de13d7aa8
50 changed files with 999 additions and 955 deletions
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102
fs/fs-writeback.c
View File

@@ -22,7 +22,6 @@
#include <linux/mm.h>
#include <linux/pagemap.h>
#include <linux/kthread.h>
#include <linux/freezer.h>
#include <linux/writeback.h>
#include <linux/blkdev.h>
#include <linux/backing-dev.h>
@@ -88,20 +87,6 @@ static inline struct inode *wb_inode(struct list_head *head)
#define CREATE_TRACE_POINTS
#include <trace/events/writeback.h>
/* Wakeup flusher thread or forker thread to fork it. Requires bdi->wb_lock. */
static void bdi_wakeup_flusher(struct backing_dev_info *bdi)
{
if (bdi->wb.task) {
wake_up_process(bdi->wb.task);
} else {
/*
* The bdi thread isn't there, wake up the forker thread which
* will create and run it.
*/
wake_up_process(default_backing_dev_info.wb.task);
}
}
static void bdi_queue_work(struct backing_dev_info *bdi,
struct wb_writeback_work *work)
{
@@ -109,10 +94,9 @@ static void bdi_queue_work(struct backing_dev_info *bdi,
spin_lock_bh(&bdi->wb_lock);
list_add_tail(&work->list, &bdi->work_list);
if (!bdi->wb.task)
trace_writeback_nothread(bdi, work);
bdi_wakeup_flusher(bdi);
spin_unlock_bh(&bdi->wb_lock);
mod_delayed_work(bdi_wq, &bdi->wb.dwork, 0);
}
static void
@@ -127,10 +111,8 @@ __bdi_start_writeback(struct backing_dev_info *bdi, long nr_pages,
*/
work = kzalloc(sizeof(*work), GFP_ATOMIC);
if (!work) {
if (bdi->wb.task) {
trace_writeback_nowork(bdi);
wake_up_process(bdi->wb.task);
}
trace_writeback_nowork(bdi);
mod_delayed_work(bdi_wq, &bdi->wb.dwork, 0);
return;
}
@@ -177,9 +159,7 @@ void bdi_start_background_writeback(struct backing_dev_info *bdi)
* writeback as soon as there is no other work to do.
*/
trace_writeback_wake_background(bdi);
spin_lock_bh(&bdi->wb_lock);
bdi_wakeup_flusher(bdi);
spin_unlock_bh(&bdi->wb_lock);
mod_delayed_work(bdi_wq, &bdi->wb.dwork, 0);
}
/*
@@ -1020,67 +1000,49 @@ long wb_do_writeback(struct bdi_writeback *wb, int force_wait)
/*
* Handle writeback of dirty data for the device backed by this bdi. Also
* wakes up periodically and does kupdated style flushing.
* reschedules periodically and does kupdated style flushing.
*/
int bdi_writeback_thread(void *data)
void bdi_writeback_workfn(struct work_struct *work)
{
struct bdi_writeback *wb = data;
struct bdi_writeback *wb = container_of(to_delayed_work(work),
struct bdi_writeback, dwork);
struct backing_dev_info *bdi = wb->bdi;
long pages_written;
set_worker_desc("flush-%s", dev_name(bdi->dev));
current->flags |= PF_SWAPWRITE;
set_freezable();
wb->last_active = jiffies;
/*
* Our parent may run at a different priority, just set us to normal
*/
set_user_nice(current, 0);
trace_writeback_thread_start(bdi);
while (!kthread_freezable_should_stop(NULL)) {
if (likely(!current_is_workqueue_rescuer() ||
list_empty(&bdi->bdi_list))) {
/*
* Remove own delayed wake-up timer, since we are already awake
* and we'll take care of the periodic write-back.
* The normal path. Keep writing back @bdi until its
* work_list is empty. Note that this path is also taken
* if @bdi is shutting down even when we're running off the
* rescuer as work_list needs to be drained.
*/
del_timer(&wb->wakeup_timer);
pages_written = wb_do_writeback(wb, 0);
do {
pages_written = wb_do_writeback(wb, 0);
trace_writeback_pages_written(pages_written);
} while (!list_empty(&bdi->work_list));
} else {
/*
* bdi_wq can't get enough workers and we're running off
* the emergency worker. Don't hog it. Hopefully, 1024 is
* enough for efficient IO.
*/
pages_written = writeback_inodes_wb(&bdi->wb, 1024,
WB_REASON_FORKER_THREAD);
trace_writeback_pages_written(pages_written);
if (pages_written)
wb->last_active = jiffies;
set_current_state(TASK_INTERRUPTIBLE);
if (!list_empty(&bdi->work_list) || kthread_should_stop()) {
__set_current_state(TASK_RUNNING);
continue;
}
if (wb_has_dirty_io(wb) && dirty_writeback_interval)
schedule_timeout(msecs_to_jiffies(dirty_writeback_interval * 10));
else {
/*
* We have nothing to do, so can go sleep without any
* timeout and save power. When a work is queued or
* something is made dirty - we will be woken up.
*/
schedule();
}
}
/* Flush any work that raced with us exiting */
if (!list_empty(&bdi->work_list))
wb_do_writeback(wb, 1);
if (!list_empty(&bdi->work_list) ||
(wb_has_dirty_io(wb) && dirty_writeback_interval))
queue_delayed_work(bdi_wq, &wb->dwork,
msecs_to_jiffies(dirty_writeback_interval * 10));
trace_writeback_thread_stop(bdi);
return 0;
current->flags &= ~PF_SWAPWRITE;
}
/*
* Start writeback of `nr_pages' pages. If `nr_pages' is zero, write back
* the whole world.