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authorLinus Torvalds <torvalds@linux-foundation.org>2012-01-09 12:59:24 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2012-01-09 12:59:24 -0800
commitdb0c2bf69aa095d4a6de7b1145f29fe9a7c0f6a3 (patch)
tree8f38957c01b18edddd44d49ecc3beeac08a20b4e /block
parentac69e0928054ff29a5049902fb477f9c7605c773 (diff)
parent0d19ea866562e46989412a0676412fa0983c9ce7 (diff)
downloadlinux-linaro-stable-db0c2bf69aa095d4a6de7b1145f29fe9a7c0f6a3.tar.gz
Merge branch 'for-3.3' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup
* 'for-3.3' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup: (21 commits) cgroup: fix to allow mounting a hierarchy by name cgroup: move assignement out of condition in cgroup_attach_proc() cgroup: Remove task_lock() from cgroup_post_fork() cgroup: add sparse annotation to cgroup_iter_start() and cgroup_iter_end() cgroup: mark cgroup_rmdir_waitq and cgroup_attach_proc() as static cgroup: only need to check oldcgrp==newgrp once cgroup: remove redundant get/put of task struct cgroup: remove redundant get/put of old css_set from migrate cgroup: Remove unnecessary task_lock before fetching css_set on migration cgroup: Drop task_lock(parent) on cgroup_fork() cgroups: remove redundant get/put of css_set from css_set_check_fetched() resource cgroups: remove bogus cast cgroup: kill subsys->can_attach_task(), pre_attach() and attach_task() cgroup, cpuset: don't use ss->pre_attach() cgroup: don't use subsys->can_attach_task() or ->attach_task() cgroup: introduce cgroup_taskset and use it in subsys->can_attach(), cancel_attach() and attach() cgroup: improve old cgroup handling in cgroup_attach_proc() cgroup: always lock threadgroup during migration threadgroup: extend threadgroup_lock() to cover exit and exec threadgroup: rename signal->threadgroup_fork_lock to ->group_rwsem ... Fix up conflict in kernel/cgroup.c due to commit e0197aae59e5: "cgroups: fix a css_set not found bug in cgroup_attach_proc" that already mentioned that the bug is fixed (differently) in Tejun's cgroup patchset. This one, in other words.
Diffstat (limited to 'block')
-rw-r--r--block/blk-cgroup.c45
1 files changed, 28 insertions, 17 deletions
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 8f630cec906e..b8c143d68ee0 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -30,8 +30,10 @@ EXPORT_SYMBOL_GPL(blkio_root_cgroup);
static struct cgroup_subsys_state *blkiocg_create(struct cgroup_subsys *,
struct cgroup *);
-static int blkiocg_can_attach_task(struct cgroup *, struct task_struct *);
-static void blkiocg_attach_task(struct cgroup *, struct task_struct *);
+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 void blkiocg_destroy(struct cgroup_subsys *, struct cgroup *);
static int blkiocg_populate(struct cgroup_subsys *, struct cgroup *);
@@ -44,8 +46,8 @@ static int blkiocg_populate(struct cgroup_subsys *, struct cgroup *);
struct cgroup_subsys blkio_subsys = {
.name = "blkio",
.create = blkiocg_create,
- .can_attach_task = blkiocg_can_attach_task,
- .attach_task = blkiocg_attach_task,
+ .can_attach = blkiocg_can_attach,
+ .attach = blkiocg_attach,
.destroy = blkiocg_destroy,
.populate = blkiocg_populate,
#ifdef CONFIG_BLK_CGROUP
@@ -1626,30 +1628,39 @@ done:
* of the main cic data structures. For now we allow a task to change
* its cgroup only if it's the only owner of its ioc.
*/
-static int blkiocg_can_attach_task(struct cgroup *cgrp, struct task_struct *tsk)
+static int blkiocg_can_attach(struct cgroup_subsys *ss, struct cgroup *cgrp,
+ struct cgroup_taskset *tset)
{
+ struct task_struct *task;
struct io_context *ioc;
int ret = 0;
/* task_lock() is needed to avoid races with exit_io_context() */
- task_lock(tsk);
- ioc = tsk->io_context;
- if (ioc && atomic_read(&ioc->nr_tasks) > 1)
- ret = -EINVAL;
- task_unlock(tsk);
-
+ cgroup_taskset_for_each(task, cgrp, tset) {
+ task_lock(task);
+ ioc = task->io_context;
+ if (ioc && atomic_read(&ioc->nr_tasks) > 1)
+ ret = -EINVAL;
+ task_unlock(task);
+ if (ret)
+ break;
+ }
return ret;
}
-static void blkiocg_attach_task(struct cgroup *cgrp, struct task_struct *tsk)
+static void blkiocg_attach(struct cgroup_subsys *ss, struct cgroup *cgrp,
+ struct cgroup_taskset *tset)
{
+ struct task_struct *task;
struct io_context *ioc;
- task_lock(tsk);
- ioc = tsk->io_context;
- if (ioc)
- ioc->cgroup_changed = 1;
- task_unlock(tsk);
+ cgroup_taskset_for_each(task, cgrp, tset) {
+ task_lock(task);
+ ioc = task->io_context;
+ if (ioc)
+ ioc->cgroup_changed = 1;
+ task_unlock(task);
+ }
}
void blkio_policy_register(struct blkio_policy_type *blkiop)