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WSL2-Linux-Kernel
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Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block 

* 'for-linus' of git://git.kernel.dk/linux-2.6-block:
  block: Don't count_vm_events for discard bio in submit_bio.
  cfq: fix recursive call in cfq_blkiocg_update_completion_stats()
  cfq-iosched: Fixed boot warning with BLK_CGROUP=y and CFQ_GROUP_IOSCHED=n
  cfq: Don't allow queue merges for queues that have no process references
  block: fix DISCARD_BARRIER requests
  cciss: set SCSI max cmd len to 16, as default is wrong
  cpqarray: fix two more wrong section type
  cpqarray: fix wrong __init type on pci probe function
  drbd: Fixed a race between disk-attach and unexpected state changes
  writeback: fix pin_sb_for_writeback
  writeback: add missing requeue_io in writeback_inodes_wb
  writeback: simplify and split bdi_start_writeback
  writeback: simplify wakeup_flusher_threads
  writeback: fix writeback_inodes_wb from writeback_inodes_sb
  writeback: enforce s_umount locking in writeback_inodes_sb
  writeback: queue work on stack in writeback_inodes_sb
  writeback: fix writeback completion notifications
This commit is contained in:
Linus Torvalds 2010-06-29 10:42:52 -07:00
Родитель 57439f878a 1b99973f1c
Коммит 984bc9601f
12 изменённых файлов: 288 добавлений и 201 удалений
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9
block/blk-core.c
Просмотреть файл

@ -1149,13 +1149,10 @@ void init_request_from_bio(struct request *req, struct bio *bio)
else
req->cmd_flags |= bio->bi_rw & REQ_FAILFAST_MASK;
if (unlikely(bio_rw_flagged(bio, BIO_RW_DISCARD))) {
if (bio_rw_flagged(bio, BIO_RW_DISCARD))
req->cmd_flags |= REQ_DISCARD;
if (bio_rw_flagged(bio, BIO_RW_BARRIER))
req->cmd_flags |= REQ_SOFTBARRIER;
} else if (unlikely(bio_rw_flagged(bio, BIO_RW_BARRIER)))
if (bio_rw_flagged(bio, BIO_RW_BARRIER))
req->cmd_flags |= REQ_HARDBARRIER;
if (bio_rw_flagged(bio, BIO_RW_SYNCIO))
req->cmd_flags |= REQ_RW_SYNC;
if (bio_rw_flagged(bio, BIO_RW_META))
@ -1586,7 +1583,7 @@ void submit_bio(int rw, struct bio *bio)
* If it's a regular read/write or a barrier with data attached,
* go through the normal accounting stuff before submission.
*/
if (bio_has_data(bio)) {
if (bio_has_data(bio) && !(rw & (1 << BIO_RW_DISCARD))) {
if (rw & WRITE) {
count_vm_events(PGPGOUT, count);
} else {

67
block/cfq-iosched.c
Просмотреть файл

@ -14,7 +14,7 @@
#include <linux/rbtree.h>
#include <linux/ioprio.h>
#include <linux/blktrace_api.h>
#include "blk-cgroup.h"
#include "cfq.h"
/*
* tunables
@ -879,7 +879,7 @@ cfq_group_service_tree_del(struct cfq_data *cfqd, struct cfq_group *cfqg)
if (!RB_EMPTY_NODE(&cfqg->rb_node))
cfq_rb_erase(&cfqg->rb_node, st);
cfqg->saved_workload_slice = 0;
blkiocg_update_dequeue_stats(&cfqg->blkg, 1);
cfq_blkiocg_update_dequeue_stats(&cfqg->blkg, 1);
}
static inline unsigned int cfq_cfqq_slice_usage(struct cfq_queue *cfqq)
@ -939,8 +939,8 @@ static void cfq_group_served(struct cfq_data *cfqd, struct cfq_group *cfqg,
cfq_log_cfqg(cfqd, cfqg, "served: vt=%llu min_vt=%llu", cfqg->vdisktime,
st->min_vdisktime);
blkiocg_update_timeslice_used(&cfqg->blkg, used_sl);
blkiocg_set_start_empty_time(&cfqg->blkg);
cfq_blkiocg_update_timeslice_used(&cfqg->blkg, used_sl);
cfq_blkiocg_set_start_empty_time(&cfqg->blkg);
}
#ifdef CONFIG_CFQ_GROUP_IOSCHED
@ -995,7 +995,7 @@ cfq_find_alloc_cfqg(struct cfq_data *cfqd, struct cgroup *cgroup, int create)
/* Add group onto cgroup list */
sscanf(dev_name(bdi->dev), "%u:%u", &major, &minor);
blkiocg_add_blkio_group(blkcg, &cfqg->blkg, (void *)cfqd,
cfq_blkiocg_add_blkio_group(blkcg, &cfqg->blkg, (void *)cfqd,
MKDEV(major, minor));
cfqg->weight = blkcg_get_weight(blkcg, cfqg->blkg.dev);
@ -1079,7 +1079,7 @@ static void cfq_release_cfq_groups(struct cfq_data *cfqd)
* it from cgroup list, then it will take care of destroying
* cfqg also.
*/
if (!blkiocg_del_blkio_group(&cfqg->blkg))
if (!cfq_blkiocg_del_blkio_group(&cfqg->blkg))
cfq_destroy_cfqg(cfqd, cfqg);
}
}
@ -1421,10 +1421,10 @@ static void cfq_reposition_rq_rb(struct cfq_queue *cfqq, struct request *rq)
{
elv_rb_del(&cfqq->sort_list, rq);
cfqq->queued[rq_is_sync(rq)]--;
blkiocg_update_io_remove_stats(&(RQ_CFQG(rq))->blkg, rq_data_dir(rq),
rq_is_sync(rq));
cfq_blkiocg_update_io_remove_stats(&(RQ_CFQG(rq))->blkg,
rq_data_dir(rq), rq_is_sync(rq));
cfq_add_rq_rb(rq);
blkiocg_update_io_add_stats(&(RQ_CFQG(rq))->blkg,
cfq_blkiocg_update_io_add_stats(&(RQ_CFQG(rq))->blkg,
&cfqq->cfqd->serving_group->blkg, rq_data_dir(rq),
rq_is_sync(rq));
}
@ -1482,8 +1482,8 @@ static void cfq_remove_request(struct request *rq)
cfq_del_rq_rb(rq);
cfqq->cfqd->rq_queued--;
blkiocg_update_io_remove_stats(&(RQ_CFQG(rq))->blkg, rq_data_dir(rq),
rq_is_sync(rq));
cfq_blkiocg_update_io_remove_stats(&(RQ_CFQG(rq))->blkg,
rq_data_dir(rq), rq_is_sync(rq));
if (rq_is_meta(rq)) {
WARN_ON(!cfqq->meta_pending);
cfqq->meta_pending--;
@ -1518,8 +1518,8 @@ static void cfq_merged_request(struct request_queue *q, struct request *req,
static void cfq_bio_merged(struct request_queue *q, struct request *req,
struct bio *bio)
{
blkiocg_update_io_merged_stats(&(RQ_CFQG(req))->blkg, bio_data_dir(bio),
cfq_bio_sync(bio));
cfq_blkiocg_update_io_merged_stats(&(RQ_CFQG(req))->blkg,
bio_data_dir(bio), cfq_bio_sync(bio));
}
static void
@ -1539,8 +1539,8 @@ cfq_merged_requests(struct request_queue *q, struct request *rq,
if (cfqq->next_rq == next)
cfqq->next_rq = rq;
cfq_remove_request(next);
blkiocg_update_io_merged_stats(&(RQ_CFQG(rq))->blkg, rq_data_dir(next),
rq_is_sync(next));
cfq_blkiocg_update_io_merged_stats(&(RQ_CFQG(rq))->blkg,
rq_data_dir(next), rq_is_sync(next));
}
static int cfq_allow_merge(struct request_queue *q, struct request *rq,
@ -1571,7 +1571,7 @@ static int cfq_allow_merge(struct request_queue *q, struct request *rq,
static inline void cfq_del_timer(struct cfq_data *cfqd, struct cfq_queue *cfqq)
{
del_timer(&cfqd->idle_slice_timer);
blkiocg_update_idle_time_stats(&cfqq->cfqg->blkg);
cfq_blkiocg_update_idle_time_stats(&cfqq->cfqg->blkg);
}
static void __cfq_set_active_queue(struct cfq_data *cfqd,
@ -1580,7 +1580,7 @@ static void __cfq_set_active_queue(struct cfq_data *cfqd,
if (cfqq) {
cfq_log_cfqq(cfqd, cfqq, "set_active wl_prio:%d wl_type:%d",
cfqd->serving_prio, cfqd->serving_type);
blkiocg_update_avg_queue_size_stats(&cfqq->cfqg->blkg);
cfq_blkiocg_update_avg_queue_size_stats(&cfqq->cfqg->blkg);
cfqq->slice_start = 0;
cfqq->dispatch_start = jiffies;
cfqq->allocated_slice = 0;
@ -1911,7 +1911,7 @@ static void cfq_arm_slice_timer(struct cfq_data *cfqd)
sl = cfqd->cfq_slice_idle;
mod_timer(&cfqd->idle_slice_timer, jiffies + sl);
blkiocg_update_set_idle_time_stats(&cfqq->cfqg->blkg);
cfq_blkiocg_update_set_idle_time_stats(&cfqq->cfqg->blkg);
cfq_log_cfqq(cfqd, cfqq, "arm_idle: %lu", sl);
}
@ -1931,7 +1931,7 @@ static void cfq_dispatch_insert(struct request_queue *q, struct request *rq)
elv_dispatch_sort(q, rq);
cfqd->rq_in_flight[cfq_cfqq_sync(cfqq)]++;
blkiocg_update_dispatch_stats(&cfqq->cfqg->blkg, blk_rq_bytes(rq),
cfq_blkiocg_update_dispatch_stats(&cfqq->cfqg->blkg, blk_rq_bytes(rq),
rq_data_dir(rq), rq_is_sync(rq));
}
@ -1986,6 +1986,15 @@ static void cfq_setup_merge(struct cfq_queue *cfqq, struct cfq_queue *new_cfqq)
int process_refs, new_process_refs;
struct cfq_queue *__cfqq;
/*
* If there are no process references on the new_cfqq, then it is
* unsafe to follow the ->new_cfqq chain as other cfqq's in the
* chain may have dropped their last reference (not just their
* last process reference).
*/
if (!cfqq_process_refs(new_cfqq))
return;
/* Avoid a circular list and skip interim queue merges */
while ((__cfqq = new_cfqq->new_cfqq)) {
if (__cfqq == cfqq)
@ -1994,17 +2003,17 @@ static void cfq_setup_merge(struct cfq_queue *cfqq, struct cfq_queue *new_cfqq)
}
process_refs = cfqq_process_refs(cfqq);
new_process_refs = cfqq_process_refs(new_cfqq);
/*
* If the process for the cfqq has gone away, there is no
* sense in merging the queues.
*/
if (process_refs == 0)
if (process_refs == 0 || new_process_refs == 0)
return;
/*
* Merge in the direction of the lesser amount of work.
*/
new_process_refs = cfqq_process_refs(new_cfqq);
if (new_process_refs >= process_refs) {
cfqq->new_cfqq = new_cfqq;
atomic_add(process_refs, &new_cfqq->ref);
@ -3248,7 +3257,7 @@ cfq_rq_enqueued(struct cfq_data *cfqd, struct cfq_queue *cfqq,
cfq_clear_cfqq_wait_request(cfqq);
__blk_run_queue(cfqd->queue);
} else {
blkiocg_update_idle_time_stats(
cfq_blkiocg_update_idle_time_stats(
&cfqq->cfqg->blkg);
cfq_mark_cfqq_must_dispatch(cfqq);
}
@ -3276,7 +3285,7 @@ static void cfq_insert_request(struct request_queue *q, struct request *rq)
rq_set_fifo_time(rq, jiffies + cfqd->cfq_fifo_expire[rq_is_sync(rq)]);
list_add_tail(&rq->queuelist, &cfqq->fifo);
cfq_add_rq_rb(rq);
blkiocg_update_io_add_stats(&(RQ_CFQG(rq))->blkg,
cfq_blkiocg_update_io_add_stats(&(RQ_CFQG(rq))->blkg,
&cfqd->serving_group->blkg, rq_data_dir(rq),
rq_is_sync(rq));
cfq_rq_enqueued(cfqd, cfqq, rq);
@ -3364,9 +3373,9 @@ static void cfq_completed_request(struct request_queue *q, struct request *rq)
WARN_ON(!cfqq->dispatched);
cfqd->rq_in_driver--;
cfqq->dispatched--;
blkiocg_update_completion_stats(&cfqq->cfqg->blkg, rq_start_time_ns(rq),
rq_io_start_time_ns(rq), rq_data_dir(rq),
rq_is_sync(rq));
cfq_blkiocg_update_completion_stats(&cfqq->cfqg->blkg,
rq_start_time_ns(rq), rq_io_start_time_ns(rq),
rq_data_dir(rq), rq_is_sync(rq));
cfqd->rq_in_flight[cfq_cfqq_sync(cfqq)]--;
@ -3730,7 +3739,7 @@ static void cfq_exit_queue(struct elevator_queue *e)
cfq_put_async_queues(cfqd);
cfq_release_cfq_groups(cfqd);
blkiocg_del_blkio_group(&cfqd->root_group.blkg);
cfq_blkiocg_del_blkio_group(&cfqd->root_group.blkg);
spin_unlock_irq(q->queue_lock);
@ -3798,8 +3807,8 @@ static void *cfq_init_queue(struct request_queue *q)
*/
atomic_set(&cfqg->ref, 1);
rcu_read_lock();
blkiocg_add_blkio_group(&blkio_root_cgroup, &cfqg->blkg, (void *)cfqd,
0);
cfq_blkiocg_add_blkio_group(&blkio_root_cgroup, &cfqg->blkg,
(void *)cfqd, 0);
rcu_read_unlock();
#endif
/*

115
block/cfq.h Normal file
Просмотреть файл

@ -0,0 +1,115 @@
#ifndef _CFQ_H
#define _CFQ_H
#include "blk-cgroup.h"
#ifdef CONFIG_CFQ_GROUP_IOSCHED
static inline void cfq_blkiocg_update_io_add_stats(struct blkio_group *blkg,
struct blkio_group *curr_blkg, bool direction, bool sync)
{
blkiocg_update_io_add_stats(blkg, curr_blkg, direction, sync);
}
static inline void cfq_blkiocg_update_dequeue_stats(struct blkio_group *blkg,
unsigned long dequeue)
{
blkiocg_update_dequeue_stats(blkg, dequeue);
}
static inline void cfq_blkiocg_update_timeslice_used(struct blkio_group *blkg,
unsigned long time)
{
blkiocg_update_timeslice_used(blkg, time);
}
static inline void cfq_blkiocg_set_start_empty_time(struct blkio_group *blkg)
{
blkiocg_set_start_empty_time(blkg);
}
static inline void cfq_blkiocg_update_io_remove_stats(struct blkio_group *blkg,
bool direction, bool sync)
{
blkiocg_update_io_remove_stats(blkg, direction, sync);
}
static inline void cfq_blkiocg_update_io_merged_stats(struct blkio_group *blkg,
bool direction, bool sync)
{
blkiocg_update_io_merged_stats(blkg, direction, sync);
}
static inline void cfq_blkiocg_update_idle_time_stats(struct blkio_group *blkg)
{
blkiocg_update_idle_time_stats(blkg);
}
static inline void
cfq_blkiocg_update_avg_queue_size_stats(struct blkio_group *blkg)
{
blkiocg_update_avg_queue_size_stats(blkg);
}
static inline void
cfq_blkiocg_update_set_idle_time_stats(struct blkio_group *blkg)
{
blkiocg_update_set_idle_time_stats(blkg);
}
static inline void cfq_blkiocg_update_dispatch_stats(struct blkio_group *blkg,
uint64_t bytes, bool direction, bool sync)
{
blkiocg_update_dispatch_stats(blkg, bytes, direction, sync);
}
static inline void cfq_blkiocg_update_completion_stats(struct blkio_group *blkg, uint64_t start_time, uint64_t io_start_time, bool direction, bool sync)
{
blkiocg_update_completion_stats(blkg, start_time, io_start_time,
direction, sync);
}
static inline void cfq_blkiocg_add_blkio_group(struct blkio_cgroup *blkcg,
struct blkio_group *blkg, void *key, dev_t dev) {
blkiocg_add_blkio_group(blkcg, blkg, key, dev);
}
static inline int cfq_blkiocg_del_blkio_group(struct blkio_group *blkg)
{
return blkiocg_del_blkio_group(blkg);
}
#else /* CFQ_GROUP_IOSCHED */
static inline void cfq_blkiocg_update_io_add_stats(struct blkio_group *blkg,
struct blkio_group *curr_blkg, bool direction, bool sync) {}
static inline void cfq_blkiocg_update_dequeue_stats(struct blkio_group *blkg,
unsigned long dequeue) {}
static inline void cfq_blkiocg_update_timeslice_used(struct blkio_group *blkg,
unsigned long time) {}
static inline void cfq_blkiocg_set_start_empty_time(struct blkio_group *blkg) {}
static inline void cfq_blkiocg_update_io_remove_stats(struct blkio_group *blkg,
bool direction, bool sync) {}
static inline void cfq_blkiocg_update_io_merged_stats(struct blkio_group *blkg,
bool direction, bool sync) {}
static inline void cfq_blkiocg_update_idle_time_stats(struct blkio_group *blkg)
{
}
static inline void
cfq_blkiocg_update_avg_queue_size_stats(struct blkio_group *blkg) {}
static inline void
cfq_blkiocg_update_set_idle_time_stats(struct blkio_group *blkg) {}
static inline void cfq_blkiocg_update_dispatch_stats(struct blkio_group *blkg,
uint64_t bytes, bool direction, bool sync) {}
static inline void cfq_blkiocg_update_completion_stats(struct blkio_group *blkg, uint64_t start_time, uint64_t io_start_time, bool direction, bool sync) {}
static inline void cfq_blkiocg_add_blkio_group(struct blkio_cgroup *blkcg,
struct blkio_group *blkg, void *key, dev_t dev) {}
static inline int cfq_blkiocg_del_blkio_group(struct blkio_group *blkg)
{
return 0;
}
#endif /* CFQ_GROUP_IOSCHED */
#endif

1
drivers/block/cciss_scsi.c
Просмотреть файл

@ -861,6 +861,7 @@ cciss_scsi_detect(int ctlr)
sh->n_io_port = 0; // I don't think we use these two...
sh->this_id = SELF_SCSI_ID;
sh->sg_tablesize = hba[ctlr]->maxsgentries;
sh->max_cmd_len = MAX_COMMAND_SIZE;
((struct cciss_scsi_adapter_data_t *)
hba[ctlr]->scsi_ctlr)->scsi_host = sh;

6
drivers/block/cpqarray.c
Просмотреть файл

@ -386,7 +386,7 @@ static void __devexit cpqarray_remove_one_eisa (int i)
}
/* pdev is NULL for eisa */
static int __init cpqarray_register_ctlr( int i, struct pci_dev *pdev)
static int __devinit cpqarray_register_ctlr( int i, struct pci_dev *pdev)
{
struct request_queue *q;
int j;
@ -503,7 +503,7 @@ Enomem4:
return -1;
}
static int __init cpqarray_init_one( struct pci_dev *pdev,
static int __devinit cpqarray_init_one( struct pci_dev *pdev,
const struct pci_device_id *ent)
{
int i;
@ -740,7 +740,7 @@ __setup("smart2=", cpqarray_setup);
/*
* Find an EISA controller's signature. Set up an hba if we find it.
*/
static int __init cpqarray_eisa_detect(void)
static int __devinit cpqarray_eisa_detect(void)
{
int i=0, j;
__u32 board_id;

2
drivers/block/drbd/drbd_main.c
Просмотреть файл

@ -1236,8 +1236,6 @@ static void after_state_ch(struct drbd_conf *mdev, union drbd_state os,
/* Last part of the attaching process ... */
if (ns.conn >= C_CONNECTED &&
os.disk == D_ATTACHING && ns.disk == D_NEGOTIATING) {
kfree(mdev->p_uuid); /* We expect to receive up-to-date UUIDs soon. */
mdev->p_uuid = NULL; /* ...to not use the old ones in the mean time */
drbd_send_sizes(mdev, 0, 0); /* to start sync... */
drbd_send_uuids(mdev);
drbd_send_state(mdev);

6
drivers/block/drbd/drbd_nl.c
Просмотреть файл

@ -1114,6 +1114,12 @@ static int drbd_nl_disk_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp
mdev->new_state_tmp.i = ns.i;
ns.i = os.i;
ns.disk = D_NEGOTIATING;
/* We expect to receive up-to-date UUIDs soon.
To avoid a race in receive_state, free p_uuid while
holding req_lock. I.e. atomic with the state change */
kfree(mdev->p_uuid);
mdev->p_uuid = NULL;
}
rv = _drbd_set_state(mdev, ns, CS_VERBOSE, NULL);

270
fs/fs-writeback.c
Просмотреть файл

@ -63,24 +63,16 @@ struct bdi_work {
};
enum {
WS_USED_B = 0,
WS_ONSTACK_B,
WS_INPROGRESS = 0,
WS_ONSTACK,
};
#define WS_USED (1 << WS_USED_B)
#define WS_ONSTACK (1 << WS_ONSTACK_B)
static inline bool bdi_work_on_stack(struct bdi_work *work)
{
return test_bit(WS_ONSTACK_B, &work->state);
}
static inline void bdi_work_init(struct bdi_work *work,
struct wb_writeback_args *args)
{
INIT_RCU_HEAD(&work->rcu_head);
work->args = *args;
work->state = WS_USED;
__set_bit(WS_INPROGRESS, &work->state);
}
/**
@ -95,43 +87,16 @@ int writeback_in_progress(struct backing_dev_info *bdi)
return !list_empty(&bdi->work_list);
}
static void bdi_work_clear(struct bdi_work *work)
{
clear_bit(WS_USED_B, &work->state);
smp_mb__after_clear_bit();
/*
* work can have disappeared at this point. bit waitq functions
* should be able to tolerate this, provided bdi_sched_wait does
* not dereference it's pointer argument.
*/
wake_up_bit(&work->state, WS_USED_B);
}
static void bdi_work_free(struct rcu_head *head)
{
struct bdi_work *work = container_of(head, struct bdi_work, rcu_head);
if (!bdi_work_on_stack(work))
clear_bit(WS_INPROGRESS, &work->state);
smp_mb__after_clear_bit();
wake_up_bit(&work->state, WS_INPROGRESS);
if (!test_bit(WS_ONSTACK, &work->state))
kfree(work);
else
bdi_work_clear(work);
}
static void wb_work_complete(struct bdi_work *work)
{
const enum writeback_sync_modes sync_mode = work->args.sync_mode;
int onstack = bdi_work_on_stack(work);
/*
* For allocated work, we can clear the done/seen bit right here.
* For on-stack work, we need to postpone both the clear and free
* to after the RCU grace period, since the stack could be invalidated
* as soon as bdi_work_clear() has done the wakeup.
*/
if (!onstack)
bdi_work_clear(work);
if (sync_mode == WB_SYNC_NONE || onstack)
call_rcu(&work->rcu_head, bdi_work_free);
}
static void wb_clear_pending(struct bdi_writeback *wb, struct bdi_work *work)
@ -147,7 +112,7 @@ static void wb_clear_pending(struct bdi_writeback *wb, struct bdi_work *work)
list_del_rcu(&work->list);
spin_unlock(&bdi->wb_lock);
wb_work_complete(work);
call_rcu(&work->rcu_head, bdi_work_free);
}
}
@ -185,9 +150,9 @@ static void bdi_queue_work(struct backing_dev_info *bdi, struct bdi_work *work)
* Used for on-stack allocated work items. The caller needs to wait until
* the wb threads have acked the work before it's safe to continue.
*/
static void bdi_wait_on_work_clear(struct bdi_work *work)
static void bdi_wait_on_work_done(struct bdi_work *work)
{
wait_on_bit(&work->state, WS_USED_B, bdi_sched_wait,
wait_on_bit(&work->state, WS_INPROGRESS, bdi_sched_wait,
TASK_UNINTERRUPTIBLE);
}
@ -213,37 +178,28 @@ static void bdi_alloc_queue_work(struct backing_dev_info *bdi,
}
/**
* bdi_sync_writeback - start and wait for writeback
* @bdi: the backing device to write from
* bdi_queue_work_onstack - start and wait for writeback
* @sb: write inodes from this super_block
*
* Description:
* This does WB_SYNC_ALL data integrity writeback and waits for the
* IO to complete. Callers must hold the sb s_umount semaphore for
* This function initiates writeback and waits for the operation to
* complete. Callers must hold the sb s_umount semaphore for
* reading, to avoid having the super disappear before we are done.
*/
static void bdi_sync_writeback(struct backing_dev_info *bdi,
struct super_block *sb)
static void bdi_queue_work_onstack(struct wb_writeback_args *args)
{
struct wb_writeback_args args = {
.sb = sb,
.sync_mode = WB_SYNC_ALL,
.nr_pages = LONG_MAX,
.range_cyclic = 0,
};
struct bdi_work work;
bdi_work_init(&work, &args);
work.state |= WS_ONSTACK;
bdi_work_init(&work, args);
__set_bit(WS_ONSTACK, &work.state);
bdi_queue_work(bdi, &work);
bdi_wait_on_work_clear(&work);
bdi_queue_work(args->sb->s_bdi, &work);
bdi_wait_on_work_done(&work);
}
/**
* bdi_start_writeback - start writeback
* @bdi: the backing device to write from
* @sb: write inodes from this super_block
* @nr_pages: the number of pages to write
*
* Description:
@ -252,25 +208,34 @@ static void bdi_sync_writeback(struct backing_dev_info *bdi,
* completion. Caller need not hold sb s_umount semaphore.
*
*/
void bdi_start_writeback(struct backing_dev_info *bdi, struct super_block *sb,
long nr_pages)
void bdi_start_writeback(struct backing_dev_info *bdi, long nr_pages)
{
struct wb_writeback_args args = {
.sb = sb,
.sync_mode = WB_SYNC_NONE,
.nr_pages = nr_pages,
.range_cyclic = 1,
};
/*
* We treat @nr_pages=0 as the special case to do background writeback,
* ie. to sync pages until the background dirty threshold is reached.
*/
if (!nr_pages) {
args.nr_pages = LONG_MAX;
args.for_background = 1;
}
bdi_alloc_queue_work(bdi, &args);
}
/**
* bdi_start_background_writeback - start background writeback
* @bdi: the backing device to write from
*
* Description:
* This does WB_SYNC_NONE background writeback. The IO is only
* started when this function returns, we make no guarentees on
* completion. Caller need not hold sb s_umount semaphore.
*/
void bdi_start_background_writeback(struct backing_dev_info *bdi)
{
struct wb_writeback_args args = {
.sync_mode = WB_SYNC_NONE,
.nr_pages = LONG_MAX,
.for_background = 1,
.range_cyclic = 1,
};
bdi_alloc_queue_work(bdi, &args);
}
@ -561,48 +526,30 @@ select_queue:
return ret;
}
static void unpin_sb_for_writeback(struct super_block *sb)
{
up_read(&sb->s_umount);
put_super(sb);
}
enum sb_pin_state {
SB_PINNED,
SB_NOT_PINNED,
SB_PIN_FAILED
};
/*
* For WB_SYNC_NONE writeback, the caller does not have the sb pinned
* For background writeback the caller does not have the sb pinned
* before calling writeback. So make sure that we do pin it, so it doesn't
* go away while we are writing inodes from it.
*/
static enum sb_pin_state pin_sb_for_writeback(struct writeback_control *wbc,
struct super_block *sb)
static bool pin_sb_for_writeback(struct super_block *sb)
{
/*
* Caller must already hold the ref for this
*/
if (wbc->sync_mode == WB_SYNC_ALL) {
WARN_ON(!rwsem_is_locked(&sb->s_umount));
return SB_NOT_PINNED;
}
spin_lock(&sb_lock);
if (list_empty(&sb->s_instances)) {
spin_unlock(&sb_lock);
return false;
}
sb->s_count++;
spin_unlock(&sb_lock);
if (down_read_trylock(&sb->s_umount)) {
if (sb->s_root) {
spin_unlock(&sb_lock);
return SB_PINNED;
}
/*
* umounted, drop rwsem again and fall through to failure
*/
if (sb->s_root)
return true;
up_read(&sb->s_umount);
}
sb->s_count--;
spin_unlock(&sb_lock);
return SB_PIN_FAILED;
put_super(sb);
return false;
}
/*
@ -681,24 +628,31 @@ static void writeback_inodes_wb(struct bdi_writeback *wb,
struct inode *inode = list_entry(wb->b_io.prev,
struct inode, i_list);
struct super_block *sb = inode->i_sb;
enum sb_pin_state state;
if (wbc->sb && sb != wbc->sb) {
/* super block given and doesn't
match, skip this inode */
redirty_tail(inode);
continue;
if (wbc->sb) {
/*
* We are requested to write out inodes for a specific
* superblock. This means we already have s_umount
* taken by the caller which also waits for us to
* complete the writeout.
*/
if (sb != wbc->sb) {
redirty_tail(inode);
continue;
}
WARN_ON(!rwsem_is_locked(&sb->s_umount));
ret = writeback_sb_inodes(sb, wb, wbc);
} else {
if (!pin_sb_for_writeback(sb)) {
requeue_io(inode);
continue;
}
ret = writeback_sb_inodes(sb, wb, wbc);
drop_super(sb);
}
state = pin_sb_for_writeback(wbc, sb);
if (state == SB_PIN_FAILED) {
requeue_io(inode);
continue;
}
ret = writeback_sb_inodes(sb, wb, wbc);
if (state == SB_PINNED)
unpin_sb_for_writeback(sb);
if (ret)
break;
}
@ -911,7 +865,7 @@ long wb_do_writeback(struct bdi_writeback *wb, int force_wait)
* If this isn't a data integrity operation, just notify
* that we have seen this work and we are now starting it.
*/
if (args.sync_mode == WB_SYNC_NONE)
if (!test_bit(WS_ONSTACK, &work->state))
wb_clear_pending(wb, work);
wrote += wb_writeback(wb, &args);
@ -920,7 +874,7 @@ long wb_do_writeback(struct bdi_writeback *wb, int force_wait)
* This is a data integrity writeback, so only do the
* notification when we have completed the work.
*/
if (args.sync_mode == WB_SYNC_ALL)
if (test_bit(WS_ONSTACK, &work->state))
wb_clear_pending(wb, work);
}
@ -977,41 +931,31 @@ int bdi_writeback_task(struct bdi_writeback *wb)
return 0;
}
/*
* Schedule writeback for all backing devices. This does WB_SYNC_NONE
* writeback, for integrity writeback see bdi_sync_writeback().
*/
static void bdi_writeback_all(struct super_block *sb, long nr_pages)
{
struct wb_writeback_args args = {
.sb = sb,
.nr_pages = nr_pages,
.sync_mode = WB_SYNC_NONE,
};
struct backing_dev_info *bdi;
rcu_read_lock();
list_for_each_entry_rcu(bdi, &bdi_list, bdi_list) {
if (!bdi_has_dirty_io(bdi))
continue;
bdi_alloc_queue_work(bdi, &args);
}
rcu_read_unlock();
}
/*
* Start writeback of `nr_pages' pages. If `nr_pages' is zero, write back
* the whole world.
*/
void wakeup_flusher_threads(long nr_pages)
{
if (nr_pages == 0)
nr_pages = global_page_state(NR_FILE_DIRTY) +
struct backing_dev_info *bdi;
struct wb_writeback_args args = {
.sync_mode = WB_SYNC_NONE,
};
if (nr_pages) {
args.nr_pages = nr_pages;
} else {
args.nr_pages = global_page_state(NR_FILE_DIRTY) +
global_page_state(NR_UNSTABLE_NFS);
bdi_writeback_all(NULL, nr_pages);
}
rcu_read_lock();
list_for_each_entry_rcu(bdi, &bdi_list, bdi_list) {
if (!bdi_has_dirty_io(bdi))
continue;
bdi_alloc_queue_work(bdi, &args);
}
rcu_read_unlock();
}
static noinline void block_dump___mark_inode_dirty(struct inode *inode)
@ -1218,12 +1162,17 @@ void writeback_inodes_sb(struct super_block *sb)
{
unsigned long nr_dirty = global_page_state(NR_FILE_DIRTY);
unsigned long nr_unstable = global_page_state(NR_UNSTABLE_NFS);
long nr_to_write;
struct wb_writeback_args args = {
.sb = sb,
.sync_mode = WB_SYNC_NONE,
};
nr_to_write = nr_dirty + nr_unstable +
WARN_ON(!rwsem_is_locked(&sb->s_umount));
args.nr_pages = nr_dirty + nr_unstable +
(inodes_stat.nr_inodes - inodes_stat.nr_unused);
bdi_start_writeback(sb->s_bdi, sb, nr_to_write);
bdi_queue_work_onstack(&args);
}
EXPORT_SYMBOL(writeback_inodes_sb);
@ -1237,7 +1186,9 @@ EXPORT_SYMBOL(writeback_inodes_sb);
int writeback_inodes_sb_if_idle(struct super_block *sb)
{
if (!writeback_in_progress(sb->s_bdi)) {
down_read(&sb->s_umount);
writeback_inodes_sb(sb);
up_read(&sb->s_umount);
return 1;
} else
return 0;
@ -1253,7 +1204,16 @@ EXPORT_SYMBOL(writeback_inodes_sb_if_idle);
*/
void sync_inodes_sb(struct super_block *sb)
{
bdi_sync_writeback(sb->s_bdi, sb);
struct wb_writeback_args args = {
.sb = sb,
.sync_mode = WB_SYNC_ALL,
.nr_pages = LONG_MAX,
.range_cyclic = 0,
};
WARN_ON(!rwsem_is_locked(&sb->s_umount));
bdi_queue_work_onstack(&args);
wait_sb_inodes(sb);
}
EXPORT_SYMBOL(sync_inodes_sb);

2
fs/ubifs/budget.c
Просмотреть файл

@ -62,7 +62,9 @@
*/
static void shrink_liability(struct ubifs_info *c, int nr_to_write)
{
down_read(&c->vfs_sb->s_umount);
writeback_inodes_sb(c->vfs_sb);
up_read(&c->vfs_sb->s_umount);
}
/**

4
include/linux/backing-dev.h
Просмотреть файл

@ -105,8 +105,8 @@ int bdi_register(struct backing_dev_info *bdi, struct device *parent,
int bdi_register_dev(struct backing_dev_info *bdi, dev_t dev);
void bdi_unregister(struct backing_dev_info *bdi);
int bdi_setup_and_register(struct backing_dev_info *, char *, unsigned int);
void bdi_start_writeback(struct backing_dev_info *bdi, struct super_block *sb,
long nr_pages);
void bdi_start_writeback(struct backing_dev_info *bdi, long nr_pages);
void bdi_start_background_writeback(struct backing_dev_info *bdi);
int bdi_writeback_task(struct bdi_writeback *wb);
int bdi_has_dirty_io(struct backing_dev_info *bdi);
void bdi_arm_supers_timer(void);

2
include/linux/drbd.h
Просмотреть файл

@ -53,7 +53,7 @@
extern const char *drbd_buildtag(void);
#define REL_VERSION "8.3.8rc2"
#define REL_VERSION "8.3.8"
#define API_VERSION 88
#define PRO_VERSION_MIN 86
#define PRO_VERSION_MAX 94

5
mm/page-writeback.c
Просмотреть файл

@ -597,7 +597,7 @@ static void balance_dirty_pages(struct address_space *mapping,
(!laptop_mode && ((global_page_state(NR_FILE_DIRTY)
+ global_page_state(NR_UNSTABLE_NFS))
> background_thresh)))
bdi_start_writeback(bdi, NULL, 0);
bdi_start_background_writeback(bdi);
}
void set_page_dirty_balance(struct page *page, int page_mkwrite)
@ -705,9 +705,8 @@ void laptop_mode_timer_fn(unsigned long data)
* We want to write everything out, not just down to the dirty
* threshold
*/
if (bdi_has_dirty_io(&q->backing_dev_info))
bdi_start_writeback(&q->backing_dev_info, NULL, nr_pages);
bdi_start_writeback(&q->backing_dev_info, nr_pages);
}
/*