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Subject[PATCH 4/4] block: remove ioc_*_changed()
Date
After the previous patch to cfq, there's no ioc_get_changed() user
left. This patch yanks out ioc_{ioprio|cgroup|get}_changed() and all
related stuff.
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Vivek Goyal <vgoyal@redhat.com>
---
block/blk-cgroup.c | 19 ------------
block/blk-ioc.c | 68 ---------------------------------------------
fs/ioprio.c | 2 +-
include/linux/iocontext.h | 7 ----
4 files changed, 1 insertions(+), 95 deletions(-)
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 30e0730..a74019b 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -47,8 +47,6 @@ static struct cgroup_subsys_state *blkiocg_create(struct cgroup_subsys *,
struct cgroup *);
static int blkiocg_can_attach(struct cgroup_subsys *, struct cgroup *,
struct cgroup_taskset *);
-static void blkiocg_attach(struct cgroup_subsys *, struct cgroup *,
- struct cgroup_taskset *);
static int blkiocg_pre_destroy(struct cgroup_subsys *, struct cgroup *);
static void blkiocg_destroy(struct cgroup_subsys *, struct cgroup *);
static int blkiocg_populate(struct cgroup_subsys *, struct cgroup *);
@@ -63,7 +61,6 @@ struct cgroup_subsys blkio_subsys = {
.name = "blkio",
.create = blkiocg_create,
.can_attach = blkiocg_can_attach,
- .attach = blkiocg_attach,
.pre_destroy = blkiocg_pre_destroy,
.destroy = blkiocg_destroy,
.populate = blkiocg_populate,
@@ -1729,22 +1726,6 @@ static int blkiocg_can_attach(struct cgroup_subsys *ss, struct cgroup *cgrp,
return ret;
}

-static void blkiocg_attach(struct cgroup_subsys *ss, struct cgroup *cgrp,
- struct cgroup_taskset *tset)
-{
- struct task_struct *task;
- struct io_context *ioc;
-
- cgroup_taskset_for_each(task, cgrp, tset) {
- /* we don't lose anything even if ioc allocation fails */
- ioc = get_task_io_context(task, GFP_ATOMIC, NUMA_NO_NODE);
- if (ioc) {
- ioc_cgroup_changed(ioc);
- put_io_context(ioc);
- }
- }
-}
-
static void blkcg_bypass_start(void)
__acquires(&all_q_mutex)
{
diff --git a/block/blk-ioc.c b/block/blk-ioc.c
index 439ec21..3f3dd51 100644
--- a/block/blk-ioc.c
+++ b/block/blk-ioc.c
@@ -388,74 +388,6 @@ struct io_cq *ioc_create_icq(struct io_context *ioc, struct request_queue *q,
return icq;
}

-void ioc_set_icq_flags(struct io_context *ioc, unsigned int flags)
-{
- struct io_cq *icq;
- struct hlist_node *n;
-
- hlist_for_each_entry(icq, n, &ioc->icq_list, ioc_node)
- icq->flags |= flags;
-}
-
-/**
- * ioc_ioprio_changed - notify ioprio change
- * @ioc: io_context of interest
- * @ioprio: new ioprio
- *
- * @ioc's ioprio has changed to @ioprio. Set %ICQ_IOPRIO_CHANGED for all
- * icq's. iosched is responsible for checking the bit and applying it on
- * request issue path.
- */
-void ioc_ioprio_changed(struct io_context *ioc, int ioprio)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&ioc->lock, flags);
- ioc->ioprio = ioprio;
- ioc_set_icq_flags(ioc, ICQ_IOPRIO_CHANGED);
- spin_unlock_irqrestore(&ioc->lock, flags);
-}
-
-/**
- * ioc_cgroup_changed - notify cgroup change
- * @ioc: io_context of interest
- *
- * @ioc's cgroup has changed. Set %ICQ_CGROUP_CHANGED for all icq's.
- * iosched is responsible for checking the bit and applying it on request
- * issue path.
- */
-void ioc_cgroup_changed(struct io_context *ioc)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&ioc->lock, flags);
- ioc_set_icq_flags(ioc, ICQ_CGROUP_CHANGED);
- spin_unlock_irqrestore(&ioc->lock, flags);
-}
-EXPORT_SYMBOL(ioc_cgroup_changed);
-
-/**
- * icq_get_changed - fetch and clear icq changed mask
- * @icq: icq of interest
- *
- * Fetch and clear ICQ_*_CHANGED bits from @icq. Grabs and releases
- * @icq->ioc->lock.
- */
-unsigned icq_get_changed(struct io_cq *icq)
-{
- unsigned int changed = 0;
- unsigned long flags;
-
- if (unlikely(icq->flags & ICQ_CHANGED_MASK)) {
- spin_lock_irqsave(&icq->ioc->lock, flags);
- changed = icq->flags & ICQ_CHANGED_MASK;
- icq->flags &= ~ICQ_CHANGED_MASK;
- spin_unlock_irqrestore(&icq->ioc->lock, flags);
- }
- return changed;
-}
-EXPORT_SYMBOL(icq_get_changed);
-
static int __init blk_ioc_init(void)
{
iocontext_cachep = kmem_cache_create("blkdev_ioc",
diff --git a/fs/ioprio.c b/fs/ioprio.c
index 0f1b951..4864437 100644
--- a/fs/ioprio.c
+++ b/fs/ioprio.c
@@ -50,7 +50,7 @@ int set_task_ioprio(struct task_struct *task, int ioprio)

ioc = get_task_io_context(task, GFP_ATOMIC, NUMA_NO_NODE);
if (ioc) {
- ioc_ioprio_changed(ioc, ioprio);
+ ioc->ioprio = ioprio;
put_io_context(ioc);
}

diff --git a/include/linux/iocontext.h b/include/linux/iocontext.h
index 6f1a260..df38db2 100644
--- a/include/linux/iocontext.h
+++ b/include/linux/iocontext.h
@@ -6,11 +6,7 @@
#include <linux/workqueue.h>

enum {
- ICQ_IOPRIO_CHANGED = 1 << 0,
- ICQ_CGROUP_CHANGED = 1 << 1,
ICQ_EXITED = 1 << 2,
-
- ICQ_CHANGED_MASK = ICQ_IOPRIO_CHANGED | ICQ_CGROUP_CHANGED,
};

/*
@@ -152,9 +148,6 @@ void put_io_context_active(struct io_context *ioc);
void exit_io_context(struct task_struct *task);
struct io_context *get_task_io_context(struct task_struct *task,
gfp_t gfp_flags, int node);
-void ioc_ioprio_changed(struct io_context *ioc, int ioprio);
-void ioc_cgroup_changed(struct io_context *ioc);
-unsigned int icq_get_changed(struct io_cq *icq);
#else
struct io_context;
static inline void put_io_context(struct io_context *ioc) { }
--
1.7.7.3


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