mirror of
https://kernel.googlesource.com/pub/scm/linux/kernel/git/torvalds/linux
synced 2025-10-31 06:54:45 +10:00
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 e0197aae59: "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.
This commit is contained in:
Linus Torvalds
commit
db0c2bf69a
@ -594,53 +594,44 @@ rmdir() will fail with it. From this behavior, pre_destroy() can be
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called multiple times against a cgroup.
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int can_attach(struct cgroup_subsys *ss, struct cgroup *cgrp,
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struct task_struct *task)
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struct cgroup_taskset *tset)
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(cgroup_mutex held by caller)
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Called prior to moving a task into a cgroup; if the subsystem
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returns an error, this will abort the attach operation. If a NULL
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task is passed, then a successful result indicates that *any*
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unspecified task can be moved into the cgroup. Note that this isn't
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called on a fork. If this method returns 0 (success) then this should
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remain valid while the caller holds cgroup_mutex and it is ensured that either
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Called prior to moving one or more tasks into a cgroup; if the
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subsystem returns an error, this will abort the attach operation.
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@tset contains the tasks to be attached and is guaranteed to have at
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least one task in it.
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If there are multiple tasks in the taskset, then:
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- it's guaranteed that all are from the same thread group
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- @tset contains all tasks from the thread group whether or not
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they're switching cgroups
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- the first task is the leader
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Each @tset entry also contains the task's old cgroup and tasks which
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aren't switching cgroup can be skipped easily using the
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cgroup_taskset_for_each() iterator. Note that this isn't called on a
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fork. If this method returns 0 (success) then this should remain valid
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while the caller holds cgroup_mutex and it is ensured that either
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attach() or cancel_attach() will be called in future.
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int can_attach_task(struct cgroup *cgrp, struct task_struct *tsk);
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(cgroup_mutex held by caller)
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As can_attach, but for operations that must be run once per task to be
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attached (possibly many when using cgroup_attach_proc). Called after
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can_attach.
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void cancel_attach(struct cgroup_subsys *ss, struct cgroup *cgrp,
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struct task_struct *task, bool threadgroup)
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struct cgroup_taskset *tset)
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(cgroup_mutex held by caller)
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Called when a task attach operation has failed after can_attach() has succeeded.
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A subsystem whose can_attach() has some side-effects should provide this
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function, so that the subsystem can implement a rollback. If not, not necessary.
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This will be called only about subsystems whose can_attach() operation have
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succeeded.
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void pre_attach(struct cgroup *cgrp);
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(cgroup_mutex held by caller)
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For any non-per-thread attachment work that needs to happen before
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attach_task. Needed by cpuset.
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succeeded. The parameters are identical to can_attach().
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void attach(struct cgroup_subsys *ss, struct cgroup *cgrp,
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struct cgroup *old_cgrp, struct task_struct *task)
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struct cgroup_taskset *tset)
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(cgroup_mutex held by caller)
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Called after the task has been attached to the cgroup, to allow any
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post-attachment activity that requires memory allocations or blocking.
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void attach_task(struct cgroup *cgrp, struct task_struct *tsk);
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(cgroup_mutex held by caller)
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As attach, but for operations that must be run once per task to be attached,
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like can_attach_task. Called before attach. Currently does not support any
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subsystem that might need the old_cgrp for every thread in the group.
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The parameters are identical to can_attach().
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void fork(struct cgroup_subsy *ss, struct task_struct *task)
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@ -30,8 +30,10 @@ EXPORT_SYMBOL_GPL(blkio_root_cgroup);
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static struct cgroup_subsys_state *blkiocg_create(struct cgroup_subsys *,
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struct cgroup *);
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static int blkiocg_can_attach_task(struct cgroup *, struct task_struct *);
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static void blkiocg_attach_task(struct cgroup *, struct task_struct *);
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static int blkiocg_can_attach(struct cgroup_subsys *, struct cgroup *,
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struct cgroup_taskset *);
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static void blkiocg_attach(struct cgroup_subsys *, struct cgroup *,
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struct cgroup_taskset *);
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static void blkiocg_destroy(struct cgroup_subsys *, struct cgroup *);
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static int blkiocg_populate(struct cgroup_subsys *, struct cgroup *);
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@ -44,8 +46,8 @@ static int blkiocg_populate(struct cgroup_subsys *, struct cgroup *);
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struct cgroup_subsys blkio_subsys = {
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.name = "blkio",
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.create = blkiocg_create,
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.can_attach_task = blkiocg_can_attach_task,
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.attach_task = blkiocg_attach_task,
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.can_attach = blkiocg_can_attach,
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.attach = blkiocg_attach,
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.destroy = blkiocg_destroy,
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.populate = blkiocg_populate,
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#ifdef CONFIG_BLK_CGROUP
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@ -1626,30 +1628,39 @@ done:
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* of the main cic data structures. For now we allow a task to change
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* its cgroup only if it's the only owner of its ioc.
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*/
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static int blkiocg_can_attach_task(struct cgroup *cgrp, struct task_struct *tsk)
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static int blkiocg_can_attach(struct cgroup_subsys *ss, struct cgroup *cgrp,
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struct cgroup_taskset *tset)
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{
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struct task_struct *task;
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struct io_context *ioc;
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int ret = 0;
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/* task_lock() is needed to avoid races with exit_io_context() */
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task_lock(tsk);
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ioc = tsk->io_context;
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if (ioc && atomic_read(&ioc->nr_tasks) > 1)
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ret = -EINVAL;
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task_unlock(tsk);
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cgroup_taskset_for_each(task, cgrp, tset) {
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task_lock(task);
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ioc = task->io_context;
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if (ioc && atomic_read(&ioc->nr_tasks) > 1)
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ret = -EINVAL;
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task_unlock(task);
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if (ret)
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break;
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}
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return ret;
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}
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static void blkiocg_attach_task(struct cgroup *cgrp, struct task_struct *tsk)
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static void blkiocg_attach(struct cgroup_subsys *ss, struct cgroup *cgrp,
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struct cgroup_taskset *tset)
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{
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struct task_struct *task;
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struct io_context *ioc;
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task_lock(tsk);
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ioc = tsk->io_context;
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if (ioc)
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ioc->cgroup_changed = 1;
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task_unlock(tsk);
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cgroup_taskset_for_each(task, cgrp, tset) {
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task_lock(task);
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ioc = task->io_context;
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if (ioc)
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ioc->cgroup_changed = 1;
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task_unlock(task);
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}
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}
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void blkio_policy_register(struct blkio_policy_type *blkiop)
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@ -456,6 +456,28 @@ int cgroup_is_descendant(const struct cgroup *cgrp, struct task_struct *task);
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void cgroup_exclude_rmdir(struct cgroup_subsys_state *css);
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void cgroup_release_and_wakeup_rmdir(struct cgroup_subsys_state *css);
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/*
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* Control Group taskset, used to pass around set of tasks to cgroup_subsys
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* methods.
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*/
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struct cgroup_taskset;
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struct task_struct *cgroup_taskset_first(struct cgroup_taskset *tset);
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struct task_struct *cgroup_taskset_next(struct cgroup_taskset *tset);
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struct cgroup *cgroup_taskset_cur_cgroup(struct cgroup_taskset *tset);
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int cgroup_taskset_size(struct cgroup_taskset *tset);
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/**
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* cgroup_taskset_for_each - iterate cgroup_taskset
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* @task: the loop cursor
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* @skip_cgrp: skip if task's cgroup matches this, %NULL to iterate through all
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* @tset: taskset to iterate
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*/
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#define cgroup_taskset_for_each(task, skip_cgrp, tset) \
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for ((task) = cgroup_taskset_first((tset)); (task); \
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(task) = cgroup_taskset_next((tset))) \
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if (!(skip_cgrp) || \
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cgroup_taskset_cur_cgroup((tset)) != (skip_cgrp))
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/*
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* Control Group subsystem type.
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* See Documentation/cgroups/cgroups.txt for details
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@ -467,14 +489,11 @@ struct cgroup_subsys {
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int (*pre_destroy)(struct cgroup_subsys *ss, struct cgroup *cgrp);
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void (*destroy)(struct cgroup_subsys *ss, struct cgroup *cgrp);
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int (*can_attach)(struct cgroup_subsys *ss, struct cgroup *cgrp,
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struct task_struct *tsk);
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int (*can_attach_task)(struct cgroup *cgrp, struct task_struct *tsk);
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struct cgroup_taskset *tset);
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void (*cancel_attach)(struct cgroup_subsys *ss, struct cgroup *cgrp,
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struct task_struct *tsk);
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void (*pre_attach)(struct cgroup *cgrp);
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void (*attach_task)(struct cgroup *cgrp, struct task_struct *tsk);
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struct cgroup_taskset *tset);
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void (*attach)(struct cgroup_subsys *ss, struct cgroup *cgrp,
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struct cgroup *old_cgrp, struct task_struct *tsk);
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struct cgroup_taskset *tset);
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void (*fork)(struct cgroup_subsys *ss, struct task_struct *task);
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void (*exit)(struct cgroup_subsys *ss, struct cgroup *cgrp,
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struct cgroup *old_cgrp, struct task_struct *task);
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@ -23,11 +23,10 @@ extern struct files_struct init_files;
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extern struct fs_struct init_fs;
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#ifdef CONFIG_CGROUPS
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#define INIT_THREADGROUP_FORK_LOCK(sig) \
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.threadgroup_fork_lock = \
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__RWSEM_INITIALIZER(sig.threadgroup_fork_lock),
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#define INIT_GROUP_RWSEM(sig) \
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.group_rwsem = __RWSEM_INITIALIZER(sig.group_rwsem),
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#else
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#define INIT_THREADGROUP_FORK_LOCK(sig)
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#define INIT_GROUP_RWSEM(sig)
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#endif
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#define INIT_SIGNALS(sig) { \
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@ -46,7 +45,7 @@ extern struct fs_struct init_fs;
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}, \
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.cred_guard_mutex = \
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__MUTEX_INITIALIZER(sig.cred_guard_mutex), \
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INIT_THREADGROUP_FORK_LOCK(sig) \
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INIT_GROUP_RWSEM(sig) \
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}
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extern struct nsproxy init_nsproxy;
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@ -637,13 +637,15 @@ struct signal_struct {
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#endif
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#ifdef CONFIG_CGROUPS
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/*
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* The threadgroup_fork_lock prevents threads from forking with
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* CLONE_THREAD while held for writing. Use this for fork-sensitive
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* threadgroup-wide operations. It's taken for reading in fork.c in
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* copy_process().
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* Currently only needed write-side by cgroups.
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* group_rwsem prevents new tasks from entering the threadgroup and
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* member tasks from exiting,a more specifically, setting of
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* PF_EXITING. fork and exit paths are protected with this rwsem
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* using threadgroup_change_begin/end(). Users which require
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* threadgroup to remain stable should use threadgroup_[un]lock()
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* which also takes care of exec path. Currently, cgroup is the
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* only user.
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*/
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struct rw_semaphore threadgroup_fork_lock;
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struct rw_semaphore group_rwsem;
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#endif
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int oom_adj; /* OOM kill score adjustment (bit shift) */
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@ -2394,29 +2396,62 @@ static inline void unlock_task_sighand(struct task_struct *tsk,
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spin_unlock_irqrestore(&tsk->sighand->siglock, *flags);
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}
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/* See the declaration of threadgroup_fork_lock in signal_struct. */
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#ifdef CONFIG_CGROUPS
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static inline void threadgroup_fork_read_lock(struct task_struct *tsk)
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static inline void threadgroup_change_begin(struct task_struct *tsk)
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{
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down_read(&tsk->signal->threadgroup_fork_lock);
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down_read(&tsk->signal->group_rwsem);
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}
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static inline void threadgroup_fork_read_unlock(struct task_struct *tsk)
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static inline void threadgroup_change_end(struct task_struct *tsk)
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{
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up_read(&tsk->signal->threadgroup_fork_lock);
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up_read(&tsk->signal->group_rwsem);
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}
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static inline void threadgroup_fork_write_lock(struct task_struct *tsk)
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/**
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* threadgroup_lock - lock threadgroup
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* @tsk: member task of the threadgroup to lock
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*
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* Lock the threadgroup @tsk belongs to. No new task is allowed to enter
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* and member tasks aren't allowed to exit (as indicated by PF_EXITING) or
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* perform exec. This is useful for cases where the threadgroup needs to
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* stay stable across blockable operations.
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*
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* fork and exit paths explicitly call threadgroup_change_{begin|end}() for
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* synchronization. While held, no new task will be added to threadgroup
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* and no existing live task will have its PF_EXITING set.
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*
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* During exec, a task goes and puts its thread group through unusual
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* changes. After de-threading, exclusive access is assumed to resources
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* which are usually shared by tasks in the same group - e.g. sighand may
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* be replaced with a new one. Also, the exec'ing task takes over group
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* leader role including its pid. Exclude these changes while locked by
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* grabbing cred_guard_mutex which is used to synchronize exec path.
|
||||
*/
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static inline void threadgroup_lock(struct task_struct *tsk)
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{
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down_write(&tsk->signal->threadgroup_fork_lock);
|
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/*
|
||||
* exec uses exit for de-threading nesting group_rwsem inside
|
||||
* cred_guard_mutex. Grab cred_guard_mutex first.
|
||||
*/
|
||||
mutex_lock(&tsk->signal->cred_guard_mutex);
|
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down_write(&tsk->signal->group_rwsem);
|
||||
}
|
||||
static inline void threadgroup_fork_write_unlock(struct task_struct *tsk)
|
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|
||||
/**
|
||||
* threadgroup_unlock - unlock threadgroup
|
||||
* @tsk: member task of the threadgroup to unlock
|
||||
*
|
||||
* Reverse threadgroup_lock().
|
||||
*/
|
||||
static inline void threadgroup_unlock(struct task_struct *tsk)
|
||||
{
|
||||
up_write(&tsk->signal->threadgroup_fork_lock);
|
||||
up_write(&tsk->signal->group_rwsem);
|
||||
mutex_unlock(&tsk->signal->cred_guard_mutex);
|
||||
}
|
||||
#else
|
||||
static inline void threadgroup_fork_read_lock(struct task_struct *tsk) {}
|
||||
static inline void threadgroup_fork_read_unlock(struct task_struct *tsk) {}
|
||||
static inline void threadgroup_fork_write_lock(struct task_struct *tsk) {}
|
||||
static inline void threadgroup_fork_write_unlock(struct task_struct *tsk) {}
|
||||
static inline void threadgroup_change_begin(struct task_struct *tsk) {}
|
||||
static inline void threadgroup_change_end(struct task_struct *tsk) {}
|
||||
static inline void threadgroup_lock(struct task_struct *tsk) {}
|
||||
static inline void threadgroup_unlock(struct task_struct *tsk) {}
|
||||
#endif
|
||||
|
||||
#ifndef __HAVE_THREAD_FUNCTIONS
|
||||
|
||||
401
kernel/cgroup.c
401
kernel/cgroup.c
@ -63,7 +63,24 @@
|
||||
|
||||
#include <linux/atomic.h>
|
||||
|
||||
/*
|
||||
* cgroup_mutex is the master lock. Any modification to cgroup or its
|
||||
* hierarchy must be performed while holding it.
|
||||
*
|
||||
* cgroup_root_mutex nests inside cgroup_mutex and should be held to modify
|
||||
* cgroupfs_root of any cgroup hierarchy - subsys list, flags,
|
||||
* release_agent_path and so on. Modifying requires both cgroup_mutex and
|
||||
* cgroup_root_mutex. Readers can acquire either of the two. This is to
|
||||
* break the following locking order cycle.
|
||||
*
|
||||
* A. cgroup_mutex -> cred_guard_mutex -> s_type->i_mutex_key -> namespace_sem
|
||||
* B. namespace_sem -> cgroup_mutex
|
||||
*
|
||||
* B happens only through cgroup_show_options() and using cgroup_root_mutex
|
||||
* breaks it.
|
||||
*/
|
||||
static DEFINE_MUTEX(cgroup_mutex);
|
||||
static DEFINE_MUTEX(cgroup_root_mutex);
|
||||
|
||||
/*
|
||||
* Generate an array of cgroup subsystem pointers. At boot time, this is
|
||||
@ -921,7 +938,7 @@ static void cgroup_d_remove_dir(struct dentry *dentry)
|
||||
*
|
||||
* CGRP_WAIT_ON_RMDIR flag is set under cgroup's inode->i_mutex;
|
||||
*/
|
||||
DECLARE_WAIT_QUEUE_HEAD(cgroup_rmdir_waitq);
|
||||
static DECLARE_WAIT_QUEUE_HEAD(cgroup_rmdir_waitq);
|
||||
|
||||
static void cgroup_wakeup_rmdir_waiter(struct cgroup *cgrp)
|
||||
{
|
||||
@ -953,6 +970,7 @@ static int rebind_subsystems(struct cgroupfs_root *root,
|
||||
int i;
|
||||
|
||||
BUG_ON(!mutex_is_locked(&cgroup_mutex));
|
||||
BUG_ON(!mutex_is_locked(&cgroup_root_mutex));
|
||||
|
||||
removed_bits = root->actual_subsys_bits & ~final_bits;
|
||||
added_bits = final_bits & ~root->actual_subsys_bits;
|
||||
@ -1043,7 +1061,7 @@ static int cgroup_show_options(struct seq_file *seq, struct dentry *dentry)
|
||||
struct cgroupfs_root *root = dentry->d_sb->s_fs_info;
|
||||
struct cgroup_subsys *ss;
|
||||
|
||||
mutex_lock(&cgroup_mutex);
|
||||
mutex_lock(&cgroup_root_mutex);
|
||||
for_each_subsys(root, ss)
|
||||
seq_printf(seq, ",%s", ss->name);
|
||||
if (test_bit(ROOT_NOPREFIX, &root->flags))
|
||||
@ -1054,7 +1072,7 @@ static int cgroup_show_options(struct seq_file *seq, struct dentry *dentry)
|
||||
seq_puts(seq, ",clone_children");
|
||||
if (strlen(root->name))
|
||||
seq_printf(seq, ",name=%s", root->name);
|
||||
mutex_unlock(&cgroup_mutex);
|
||||
mutex_unlock(&cgroup_root_mutex);
|
||||
return 0;
|
||||
}
|
||||
|
||||
@ -1175,10 +1193,10 @@ static int parse_cgroupfs_options(char *data, struct cgroup_sb_opts *opts)
|
||||
|
||||
/*
|
||||
* If the 'all' option was specified select all the subsystems,
|
||||
* otherwise 'all, 'none' and a subsystem name options were not
|
||||
* specified, let's default to 'all'
|
||||
* otherwise if 'none', 'name=' and a subsystem name options
|
||||
* were not specified, let's default to 'all'
|
||||
*/
|
||||
if (all_ss || (!all_ss && !one_ss && !opts->none)) {
|
||||
if (all_ss || (!one_ss && !opts->none && !opts->name)) {
|
||||
for (i = 0; i < CGROUP_SUBSYS_COUNT; i++) {
|
||||
struct cgroup_subsys *ss = subsys[i];
|
||||
if (ss == NULL)
|
||||
@ -1269,6 +1287,7 @@ static int cgroup_remount(struct super_block *sb, int *flags, char *data)
|
||||
|
||||
mutex_lock(&cgrp->dentry->d_inode->i_mutex);
|
||||
mutex_lock(&cgroup_mutex);
|
||||
mutex_lock(&cgroup_root_mutex);
|
||||
|
||||
/* See what subsystems are wanted */
|
||||
ret = parse_cgroupfs_options(data, &opts);
|
||||
@ -1297,6 +1316,7 @@ static int cgroup_remount(struct super_block *sb, int *flags, char *data)
|
||||
out_unlock:
|
||||
kfree(opts.release_agent);
|
||||
kfree(opts.name);
|
||||
mutex_unlock(&cgroup_root_mutex);
|
||||
mutex_unlock(&cgroup_mutex);
|
||||
mutex_unlock(&cgrp->dentry->d_inode->i_mutex);
|
||||
return ret;
|
||||
@ -1481,6 +1501,7 @@ static struct dentry *cgroup_mount(struct file_system_type *fs_type,
|
||||
int ret = 0;
|
||||
struct super_block *sb;
|
||||
struct cgroupfs_root *new_root;
|
||||
struct inode *inode;
|
||||
|
||||
/* First find the desired set of subsystems */
|
||||
mutex_lock(&cgroup_mutex);
|
||||
@ -1514,7 +1535,6 @@ static struct dentry *cgroup_mount(struct file_system_type *fs_type,
|
||||
/* We used the new root structure, so this is a new hierarchy */
|
||||
struct list_head tmp_cg_links;
|
||||
struct cgroup *root_cgrp = &root->top_cgroup;
|
||||
struct inode *inode;
|
||||
struct cgroupfs_root *existing_root;
|
||||
const struct cred *cred;
|
||||
int i;
|
||||
@ -1528,18 +1548,14 @@ static struct dentry *cgroup_mount(struct file_system_type *fs_type,
|
||||
|
||||
mutex_lock(&inode->i_mutex);
|
||||
mutex_lock(&cgroup_mutex);
|
||||
mutex_lock(&cgroup_root_mutex);
|
||||
|
||||
if (strlen(root->name)) {
|
||||
/* Check for name clashes with existing mounts */
|
||||
for_each_active_root(existing_root) {
|
||||
if (!strcmp(existing_root->name, root->name)) {
|
||||
ret = -EBUSY;
|
||||
mutex_unlock(&cgroup_mutex);
|
||||
mutex_unlock(&inode->i_mutex);
|
||||
goto drop_new_super;
|
||||
}
|
||||
}
|
||||
}
|
||||
/* Check for name clashes with existing mounts */
|
||||
ret = -EBUSY;
|
||||
if (strlen(root->name))
|
||||
for_each_active_root(existing_root)
|
||||
if (!strcmp(existing_root->name, root->name))
|
||||
goto unlock_drop;
|
||||
|
||||
/*
|
||||
* We're accessing css_set_count without locking
|
||||
@ -1549,18 +1565,13 @@ static struct dentry *cgroup_mount(struct file_system_type *fs_type,
|
||||
* have some link structures left over
|
||||
*/
|
||||
ret = allocate_cg_links(css_set_count, &tmp_cg_links);
|
||||
if (ret) {
|
||||
mutex_unlock(&cgroup_mutex);
|
||||
mutex_unlock(&inode->i_mutex);
|
||||
goto drop_new_super;
|
||||
}
|
||||
if (ret)
|
||||
goto unlock_drop;
|
||||
|
||||
ret = rebind_subsystems(root, root->subsys_bits);
|
||||
if (ret == -EBUSY) {
|
||||
mutex_unlock(&cgroup_mutex);
|
||||
mutex_unlock(&inode->i_mutex);
|
||||
free_cg_links(&tmp_cg_links);
|
||||
goto drop_new_super;
|
||||
goto unlock_drop;
|
||||
}
|
||||
/*
|
||||
* There must be no failure case after here, since rebinding
|
||||
@ -1599,6 +1610,7 @@ static struct dentry *cgroup_mount(struct file_system_type *fs_type,
|
||||
cred = override_creds(&init_cred);
|
||||
cgroup_populate_dir(root_cgrp);
|
||||
revert_creds(cred);
|
||||
mutex_unlock(&cgroup_root_mutex);
|
||||
mutex_unlock(&cgroup_mutex);
|
||||
mutex_unlock(&inode->i_mutex);
|
||||
} else {
|
||||
@ -1615,6 +1627,10 @@ static struct dentry *cgroup_mount(struct file_system_type *fs_type,
|
||||
kfree(opts.name);
|
||||
return dget(sb->s_root);
|
||||
|
||||
unlock_drop:
|
||||
mutex_unlock(&cgroup_root_mutex);
|
||||
mutex_unlock(&cgroup_mutex);
|
||||
mutex_unlock(&inode->i_mutex);
|
||||
drop_new_super:
|
||||
deactivate_locked_super(sb);
|
||||
drop_modules:
|
||||
@ -1639,6 +1655,7 @@ static void cgroup_kill_sb(struct super_block *sb) {
|
||||
BUG_ON(!list_empty(&cgrp->sibling));
|
||||
|
||||
mutex_lock(&cgroup_mutex);
|
||||
mutex_lock(&cgroup_root_mutex);
|
||||
|
||||
/* Rebind all subsystems back to the default hierarchy */
|
||||
ret = rebind_subsystems(root, 0);
|
||||
@ -1664,6 +1681,7 @@ static void cgroup_kill_sb(struct super_block *sb) {
|
||||
root_count--;
|
||||
}
|
||||
|
||||
mutex_unlock(&cgroup_root_mutex);
|
||||
mutex_unlock(&cgroup_mutex);
|
||||
|
||||
kill_litter_super(sb);
|
||||
@ -1739,12 +1757,91 @@ int cgroup_path(const struct cgroup *cgrp, char *buf, int buflen)
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(cgroup_path);
|
||||
|
||||
/*
|
||||
* Control Group taskset
|
||||
*/
|
||||
struct task_and_cgroup {
|
||||
struct task_struct *task;
|
||||
struct cgroup *cgrp;
|
||||
};
|
||||
|
||||
struct cgroup_taskset {
|
||||
struct task_and_cgroup single;
|
||||
struct flex_array *tc_array;
|
||||
int tc_array_len;
|
||||
int idx;
|
||||
struct cgroup *cur_cgrp;
|
||||
};
|
||||
|
||||
/**
|
||||
* cgroup_taskset_first - reset taskset and return the first task
|
||||
* @tset: taskset of interest
|
||||
*
|
||||
* @tset iteration is initialized and the first task is returned.
|
||||
*/
|
||||
struct task_struct *cgroup_taskset_first(struct cgroup_taskset *tset)
|
||||
{
|
||||
if (tset->tc_array) {
|
||||
tset->idx = 0;
|
||||
return cgroup_taskset_next(tset);
|
||||
} else {
|
||||
tset->cur_cgrp = tset->single.cgrp;
|
||||
return tset->single.task;
|
||||
}
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(cgroup_taskset_first);
|
||||
|
||||
/**
|
||||
* cgroup_taskset_next - iterate to the next task in taskset
|
||||
* @tset: taskset of interest
|
||||
*
|
||||
* Return the next task in @tset. Iteration must have been initialized
|
||||
* with cgroup_taskset_first().
|
||||
*/
|
||||
struct task_struct *cgroup_taskset_next(struct cgroup_taskset *tset)
|
||||
{
|
||||
struct task_and_cgroup *tc;
|
||||
|
||||
if (!tset->tc_array || tset->idx >= tset->tc_array_len)
|
||||
return NULL;
|
||||
|
||||
tc = flex_array_get(tset->tc_array, tset->idx++);
|
||||
tset->cur_cgrp = tc->cgrp;
|
||||
return tc->task;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(cgroup_taskset_next);
|
||||
|
||||
/**
|
||||
* cgroup_taskset_cur_cgroup - return the matching cgroup for the current task
|
||||
* @tset: taskset of interest
|
||||
*
|
||||
* Return the cgroup for the current (last returned) task of @tset. This
|
||||
* function must be preceded by either cgroup_taskset_first() or
|
||||
* cgroup_taskset_next().
|
||||
*/
|
||||
struct cgroup *cgroup_taskset_cur_cgroup(struct cgroup_taskset *tset)
|
||||
{
|
||||
return tset->cur_cgrp;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(cgroup_taskset_cur_cgroup);
|
||||
|
||||
/**
|
||||
* cgroup_taskset_size - return the number of tasks in taskset
|
||||
* @tset: taskset of interest
|
||||
*/
|
||||
int cgroup_taskset_size(struct cgroup_taskset *tset)
|
||||
{
|
||||
return tset->tc_array ? tset->tc_array_len : 1;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(cgroup_taskset_size);
|
||||
|
||||
|
||||
/*
|
||||
* cgroup_task_migrate - move a task from one cgroup to another.
|
||||
*
|
||||
* 'guarantee' is set if the caller promises that a new css_set for the task
|
||||
* will already exist. If not set, this function might sleep, and can fail with
|
||||
* -ENOMEM. Otherwise, it can only fail with -ESRCH.
|
||||
* -ENOMEM. Must be called with cgroup_mutex and threadgroup locked.
|
||||
*/
|
||||
static int cgroup_task_migrate(struct cgroup *cgrp, struct cgroup *oldcgrp,
|
||||
struct task_struct *tsk, bool guarantee)
|
||||
@ -1753,14 +1850,12 @@ static int cgroup_task_migrate(struct cgroup *cgrp, struct cgroup *oldcgrp,
|
||||
struct css_set *newcg;
|
||||
|
||||
/*
|
||||
* get old css_set. we need to take task_lock and refcount it, because
|
||||
* an exiting task can change its css_set to init_css_set and drop its
|
||||
* old one without taking cgroup_mutex.
|
||||
* We are synchronized through threadgroup_lock() against PF_EXITING
|
||||
* setting such that we can't race against cgroup_exit() changing the
|
||||
* css_set to init_css_set and dropping the old one.
|
||||
*/
|
||||
task_lock(tsk);
|
||||
WARN_ON_ONCE(tsk->flags & PF_EXITING);
|
||||
oldcg = tsk->cgroups;
|
||||
get_css_set(oldcg);
|
||||
task_unlock(tsk);
|
||||
|
||||
/* locate or allocate a new css_set for this task. */
|
||||
if (guarantee) {
|
||||
@ -1775,20 +1870,11 @@ static int cgroup_task_migrate(struct cgroup *cgrp, struct cgroup *oldcgrp,
|
||||
might_sleep();
|
||||
/* find_css_set will give us newcg already referenced. */
|
||||
newcg = find_css_set(oldcg, cgrp);
|
||||
if (!newcg) {
|
||||
put_css_set(oldcg);
|
||||
if (!newcg)
|
||||
return -ENOMEM;
|
||||
}
|
||||
}
|
||||
put_css_set(oldcg);
|
||||
|
||||
/* if PF_EXITING is set, the tsk->cgroups pointer is no longer safe. */
|
||||
task_lock(tsk);
|
||||
if (tsk->flags & PF_EXITING) {
|
||||
task_unlock(tsk);
|
||||
put_css_set(newcg);
|
||||
return -ESRCH;
|
||||
}
|
||||
rcu_assign_pointer(tsk->cgroups, newcg);
|
||||
task_unlock(tsk);
|
||||
|
||||
@ -1814,8 +1900,8 @@ static int cgroup_task_migrate(struct cgroup *cgrp, struct cgroup *oldcgrp,
|
||||
* @cgrp: the cgroup the task is attaching to
|
||||
* @tsk: the task to be attached
|
||||
*
|
||||
* Call holding cgroup_mutex. May take task_lock of
|
||||
* the task 'tsk' during call.
|
||||
* Call with cgroup_mutex and threadgroup locked. May take task_lock of
|
||||
* @tsk during call.
|
||||
*/
|
||||
int cgroup_attach_task(struct cgroup *cgrp, struct task_struct *tsk)
|
||||
{
|
||||
@ -1823,15 +1909,23 @@ int cgroup_attach_task(struct cgroup *cgrp, struct task_struct *tsk)
|
||||
struct cgroup_subsys *ss, *failed_ss = NULL;
|
||||
struct cgroup *oldcgrp;
|
||||
struct cgroupfs_root *root = cgrp->root;
|
||||
struct cgroup_taskset tset = { };
|
||||
|
||||
/* @tsk either already exited or can't exit until the end */
|
||||
if (tsk->flags & PF_EXITING)
|
||||
return -ESRCH;
|
||||
|
||||
/* Nothing to do if the task is already in that cgroup */
|
||||
oldcgrp = task_cgroup_from_root(tsk, root);
|
||||
if (cgrp == oldcgrp)
|
||||
return 0;
|
||||
|
||||
tset.single.task = tsk;
|
||||
tset.single.cgrp = oldcgrp;
|
||||
|
||||
for_each_subsys(root, ss) {
|
||||
if (ss->can_attach) {
|
||||
retval = ss->can_attach(ss, cgrp, tsk);
|
||||
retval = ss->can_attach(ss, cgrp, &tset);
|
||||
if (retval) {
|
||||
/*
|
||||
* Remember on which subsystem the can_attach()
|
||||
@ -1843,13 +1937,6 @@ int cgroup_attach_task(struct cgroup *cgrp, struct task_struct *tsk)
|
||||
goto out;
|
||||
}
|
||||
}
|
||||
if (ss->can_attach_task) {
|
||||
retval = ss->can_attach_task(cgrp, tsk);
|
||||
if (retval) {
|
||||
failed_ss = ss;
|
||||
goto out;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
retval = cgroup_task_migrate(cgrp, oldcgrp, tsk, false);
|
||||
@ -1857,12 +1944,8 @@ int cgroup_attach_task(struct cgroup *cgrp, struct task_struct *tsk)
|
||||
goto out;
|
||||
|
||||
for_each_subsys(root, ss) {
|
||||
if (ss->pre_attach)
|
||||
ss->pre_attach(cgrp);
|
||||
if (ss->attach_task)
|
||||
ss->attach_task(cgrp, tsk);
|
||||
if (ss->attach)
|
||||
ss->attach(ss, cgrp, oldcgrp, tsk);
|
||||
ss->attach(ss, cgrp, &tset);
|
||||
}
|
||||
|
||||
synchronize_rcu();
|
||||
@ -1884,7 +1967,7 @@ out:
|
||||
*/
|
||||
break;
|
||||
if (ss->cancel_attach)
|
||||
ss->cancel_attach(ss, cgrp, tsk);
|
||||
ss->cancel_attach(ss, cgrp, &tset);
|
||||
}
|
||||
}
|
||||
return retval;
|
||||
@ -1935,23 +2018,17 @@ static bool css_set_check_fetched(struct cgroup *cgrp,
|
||||
|
||||
read_lock(&css_set_lock);
|
||||
newcg = find_existing_css_set(cg, cgrp, template);
|
||||
if (newcg)
|
||||
get_css_set(newcg);
|
||||
read_unlock(&css_set_lock);
|
||||
|
||||
/* doesn't exist at all? */
|
||||
if (!newcg)
|
||||
return false;
|
||||
/* see if it's already in the list */
|
||||
list_for_each_entry(cg_entry, newcg_list, links) {
|
||||
if (cg_entry->cg == newcg) {
|
||||
put_css_set(newcg);
|
||||
list_for_each_entry(cg_entry, newcg_list, links)
|
||||
if (cg_entry->cg == newcg)
|
||||
return true;
|
||||
}
|
||||
}
|
||||
|
||||
/* not found */
|
||||
put_css_set(newcg);
|
||||
return false;
|
||||
}
|
||||
|
||||
@ -1985,21 +2062,21 @@ static int css_set_prefetch(struct cgroup *cgrp, struct css_set *cg,
|
||||
* @cgrp: the cgroup to attach to
|
||||
* @leader: the threadgroup leader task_struct of the group to be attached
|
||||
*
|
||||
* Call holding cgroup_mutex and the threadgroup_fork_lock of the leader. Will
|
||||
* take task_lock of each thread in leader's threadgroup individually in turn.
|
||||
* Call holding cgroup_mutex and the group_rwsem of the leader. Will take
|
||||
* task_lock of each thread in leader's threadgroup individually in turn.
|
||||
*/
|
||||
int cgroup_attach_proc(struct cgroup *cgrp, struct task_struct *leader)
|
||||
static int cgroup_attach_proc(struct cgroup *cgrp, struct task_struct *leader)
|
||||
{
|
||||
int retval, i, group_size;
|
||||
struct cgroup_subsys *ss, *failed_ss = NULL;
|
||||
bool cancel_failed_ss = false;
|
||||
/* guaranteed to be initialized later, but the compiler needs this */
|
||||
struct cgroup *oldcgrp = NULL;
|
||||
struct css_set *oldcg;
|
||||
struct cgroupfs_root *root = cgrp->root;
|
||||
/* threadgroup list cursor and array */
|
||||
struct task_struct *tsk;
|
||||
struct task_and_cgroup *tc;
|
||||
struct flex_array *group;
|
||||
struct cgroup_taskset tset = { };
|
||||
/*
|
||||
* we need to make sure we have css_sets for all the tasks we're
|
||||
* going to move -before- we actually start moving them, so that in
|
||||
@ -2012,13 +2089,12 @@ int cgroup_attach_proc(struct cgroup *cgrp, struct task_struct *leader)
|
||||
* step 0: in order to do expensive, possibly blocking operations for
|
||||
* every thread, we cannot iterate the thread group list, since it needs
|
||||
* rcu or tasklist locked. instead, build an array of all threads in the
|
||||
* group - threadgroup_fork_lock prevents new threads from appearing,
|
||||
* and if threads exit, this will just be an over-estimate.
|
||||
* group - group_rwsem prevents new threads from appearing, and if
|
||||
* threads exit, this will just be an over-estimate.
|
||||
*/
|
||||
group_size = get_nr_threads(leader);
|
||||
/* flex_array supports very large thread-groups better than kmalloc. */
|
||||
group = flex_array_alloc(sizeof(struct task_struct *), group_size,
|
||||
GFP_KERNEL);
|
||||
group = flex_array_alloc(sizeof(*tc), group_size, GFP_KERNEL);
|
||||
if (!group)
|
||||
return -ENOMEM;
|
||||
/* pre-allocate to guarantee space while iterating in rcu read-side. */
|
||||
@ -2040,49 +2116,53 @@ int cgroup_attach_proc(struct cgroup *cgrp, struct task_struct *leader)
|
||||
retval = -EAGAIN;
|
||||
goto out_free_group_list;
|
||||
}
|
||||
/* take a reference on each task in the group to go in the array. */
|
||||
|
||||
tsk = leader;
|
||||
i = 0;
|
||||
do {
|
||||
struct task_and_cgroup ent;
|
||||
|
||||
/* @tsk either already exited or can't exit until the end */
|
||||
if (tsk->flags & PF_EXITING)
|
||||
continue;
|
||||
|
||||
/* as per above, nr_threads may decrease, but not increase. */
|
||||
BUG_ON(i >= group_size);
|
||||
get_task_struct(tsk);
|
||||
/*
|
||||
* saying GFP_ATOMIC has no effect here because we did prealloc
|
||||
* earlier, but it's good form to communicate our expectations.
|
||||
*/
|
||||
retval = flex_array_put_ptr(group, i, tsk, GFP_ATOMIC);
|
||||
ent.task = tsk;
|
||||
ent.cgrp = task_cgroup_from_root(tsk, root);
|
||||
/* nothing to do if this task is already in the cgroup */
|
||||
if (ent.cgrp == cgrp)
|
||||
continue;
|
||||
retval = flex_array_put(group, i, &ent, GFP_ATOMIC);
|
||||
BUG_ON(retval != 0);
|
||||
i++;
|
||||
} while_each_thread(leader, tsk);
|
||||
/* remember the number of threads in the array for later. */
|
||||
group_size = i;
|
||||
tset.tc_array = group;
|
||||
tset.tc_array_len = group_size;
|
||||
read_unlock(&tasklist_lock);
|
||||
|
||||
/* methods shouldn't be called if no task is actually migrating */
|
||||
retval = 0;
|
||||
if (!group_size)
|
||||
goto out_free_group_list;
|
||||
|
||||
/*
|
||||
* step 1: check that we can legitimately attach to the cgroup.
|
||||
*/
|
||||
for_each_subsys(root, ss) {
|
||||
if (ss->can_attach) {
|
||||
retval = ss->can_attach(ss, cgrp, leader);
|
||||
retval = ss->can_attach(ss, cgrp, &tset);
|
||||
if (retval) {
|
||||
failed_ss = ss;
|
||||
goto out_cancel_attach;
|
||||
}
|
||||
}
|
||||
/* a callback to be run on every thread in the threadgroup. */
|
||||
if (ss->can_attach_task) {
|
||||
/* run on each task in the threadgroup. */
|
||||
for (i = 0; i < group_size; i++) {
|
||||
tsk = flex_array_get_ptr(group, i);
|
||||
retval = ss->can_attach_task(cgrp, tsk);
|
||||
if (retval) {
|
||||
failed_ss = ss;
|
||||
cancel_failed_ss = true;
|
||||
goto out_cancel_attach;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
@ -2091,67 +2171,36 @@ int cgroup_attach_proc(struct cgroup *cgrp, struct task_struct *leader)
|
||||
*/
|
||||
INIT_LIST_HEAD(&newcg_list);
|
||||
for (i = 0; i < group_size; i++) {
|
||||
tsk = flex_array_get_ptr(group, i);
|
||||
/* nothing to do if this task is already in the cgroup */
|
||||
oldcgrp = task_cgroup_from_root(tsk, root);
|
||||
if (cgrp == oldcgrp)
|
||||
continue;
|
||||
/* get old css_set pointer */
|
||||
task_lock(tsk);
|
||||
oldcg = tsk->cgroups;
|
||||
get_css_set(oldcg);
|
||||
task_unlock(tsk);
|
||||
/* see if the new one for us is already in the list? */
|
||||
if (css_set_check_fetched(cgrp, tsk, oldcg, &newcg_list)) {
|
||||
/* was already there, nothing to do. */
|
||||
put_css_set(oldcg);
|
||||
} else {
|
||||
/* we don't already have it. get new one. */
|
||||
tc = flex_array_get(group, i);
|
||||
oldcg = tc->task->cgroups;
|
||||
|
||||
/* if we don't already have it in the list get a new one */
|
||||
if (!css_set_check_fetched(cgrp, tc->task, oldcg,
|
||||
&newcg_list)) {
|
||||
retval = css_set_prefetch(cgrp, oldcg, &newcg_list);
|
||||
put_css_set(oldcg);
|
||||
if (retval)
|
||||
goto out_list_teardown;
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* step 3: now that we're guaranteed success wrt the css_sets, proceed
|
||||
* to move all tasks to the new cgroup, calling ss->attach_task for each
|
||||
* one along the way. there are no failure cases after here, so this is
|
||||
* the commit point.
|
||||
* step 3: now that we're guaranteed success wrt the css_sets,
|
||||
* proceed to move all tasks to the new cgroup. There are no
|
||||
* failure cases after here, so this is the commit point.
|
||||
*/
|
||||
for_each_subsys(root, ss) {
|
||||
if (ss->pre_attach)
|
||||
ss->pre_attach(cgrp);
|
||||
}
|
||||
for (i = 0; i < group_size; i++) {
|
||||
tsk = flex_array_get_ptr(group, i);
|
||||
/* leave current thread as it is if it's already there */
|
||||
oldcgrp = task_cgroup_from_root(tsk, root);
|
||||
if (cgrp == oldcgrp)
|
||||
continue;
|
||||
/* if the thread is PF_EXITING, it can just get skipped. */
|
||||
retval = cgroup_task_migrate(cgrp, oldcgrp, tsk, true);
|
||||
if (retval == 0) {
|
||||
/* attach each task to each subsystem */
|
||||
for_each_subsys(root, ss) {
|
||||
if (ss->attach_task)
|
||||
ss->attach_task(cgrp, tsk);
|
||||
}
|
||||
} else {
|
||||
BUG_ON(retval != -ESRCH);
|
||||
}
|
||||
tc = flex_array_get(group, i);
|
||||
retval = cgroup_task_migrate(cgrp, tc->cgrp, tc->task, true);
|
||||
BUG_ON(retval);
|
||||
}
|
||||
/* nothing is sensitive to fork() after this point. */
|
||||
|
||||
/*
|
||||
* step 4: do expensive, non-thread-specific subsystem callbacks.
|
||||
* TODO: if ever a subsystem needs to know the oldcgrp for each task
|
||||
* being moved, this call will need to be reworked to communicate that.
|
||||
* step 4: do subsystem attach callbacks.
|
||||
*/
|
||||
for_each_subsys(root, ss) {
|
||||
if (ss->attach)
|
||||
ss->attach(ss, cgrp, oldcgrp, leader);
|
||||
ss->attach(ss, cgrp, &tset);
|
||||
}
|
||||
|
||||
/*
|
||||
@ -2171,20 +2220,12 @@ out_cancel_attach:
|
||||
/* same deal as in cgroup_attach_task */
|
||||
if (retval) {
|
||||
for_each_subsys(root, ss) {
|
||||
if (ss == failed_ss) {
|
||||
if (cancel_failed_ss && ss->cancel_attach)
|
||||
ss->cancel_attach(ss, cgrp, leader);
|
||||
if (ss == failed_ss)
|
||||
break;
|
||||
}
|
||||
if (ss->cancel_attach)
|
||||
ss->cancel_attach(ss, cgrp, leader);
|
||||
ss->cancel_attach(ss, cgrp, &tset);
|
||||
}
|
||||
}
|
||||
/* clean up the array of referenced threads in the group. */
|
||||
for (i = 0; i < group_size; i++) {
|
||||
tsk = flex_array_get_ptr(group, i);
|
||||
put_task_struct(tsk);
|
||||
}
|
||||
out_free_group_list:
|
||||
flex_array_free(group);
|
||||
return retval;
|
||||
@ -2192,8 +2233,8 @@ out_free_group_list:
|
||||
|
||||
/*
|
||||
* Find the task_struct of the task to attach by vpid and pass it along to the
|
||||
* function to attach either it or all tasks in its threadgroup. Will take
|
||||
* cgroup_mutex; may take task_lock of task.
|
||||
* function to attach either it or all tasks in its threadgroup. Will lock
|
||||
* cgroup_mutex and threadgroup; may take task_lock of task.
|
||||
*/
|
||||
static int attach_task_by_pid(struct cgroup *cgrp, u64 pid, bool threadgroup)
|
||||
{
|
||||
@ -2220,13 +2261,7 @@ static int attach_task_by_pid(struct cgroup *cgrp, u64 pid, bool threadgroup)
|
||||
* detect it later.
|
||||
*/
|
||||
tsk = tsk->group_leader;
|
||||
} else if (tsk->flags & PF_EXITING) {
|
||||
/* optimization for the single-task-only case */
|
||||
rcu_read_unlock();
|
||||
cgroup_unlock();
|
||||
return -ESRCH;
|
||||
}
|
||||
|
||||
/*
|
||||
* even if we're attaching all tasks in the thread group, we
|
||||
* only need to check permissions on one of them.
|
||||
@ -2249,13 +2284,15 @@ static int attach_task_by_pid(struct cgroup *cgrp, u64 pid, bool threadgroup)
|
||||
get_task_struct(tsk);
|
||||
}
|
||||
|
||||
if (threadgroup) {
|
||||
threadgroup_fork_write_lock(tsk);
|
||||
threadgroup_lock(tsk);
|
||||
|
||||
if (threadgroup)
|
||||
ret = cgroup_attach_proc(cgrp, tsk);
|
||||
threadgroup_fork_write_unlock(tsk);
|
||||
} else {
|
||||
else
|
||||
ret = cgroup_attach_task(cgrp, tsk);
|
||||
}
|
||||
|
||||
threadgroup_unlock(tsk);
|
||||
|
||||
put_task_struct(tsk);
|
||||
cgroup_unlock();
|
||||
return ret;
|
||||
@ -2306,7 +2343,9 @@ static int cgroup_release_agent_write(struct cgroup *cgrp, struct cftype *cft,
|
||||
return -EINVAL;
|
||||
if (!cgroup_lock_live_group(cgrp))
|
||||
return -ENODEV;
|
||||
mutex_lock(&cgroup_root_mutex);
|
||||
strcpy(cgrp->root->release_agent_path, buffer);
|
||||
mutex_unlock(&cgroup_root_mutex);
|
||||
cgroup_unlock();
|
||||
return 0;
|
||||
}
|
||||
@ -2789,6 +2828,7 @@ static void cgroup_enable_task_cg_lists(void)
|
||||
}
|
||||
|
||||
void cgroup_iter_start(struct cgroup *cgrp, struct cgroup_iter *it)
|
||||
__acquires(css_set_lock)
|
||||
{
|
||||
/*
|
||||
* The first time anyone tries to iterate across a cgroup,
|
||||
@ -2828,6 +2868,7 @@ struct task_struct *cgroup_iter_next(struct cgroup *cgrp,
|
||||
}
|
||||
|
||||
void cgroup_iter_end(struct cgroup *cgrp, struct cgroup_iter *it)
|
||||
__releases(css_set_lock)
|
||||
{
|
||||
read_unlock(&css_set_lock);
|
||||
}
|
||||
@ -4491,20 +4532,31 @@ static const struct file_operations proc_cgroupstats_operations = {
|
||||
*
|
||||
* A pointer to the shared css_set was automatically copied in
|
||||
* fork.c by dup_task_struct(). However, we ignore that copy, since
|
||||
* it was not made under the protection of RCU or cgroup_mutex, so
|
||||
* might no longer be a valid cgroup pointer. cgroup_attach_task() might
|
||||
* have already changed current->cgroups, allowing the previously
|
||||
* referenced cgroup group to be removed and freed.
|
||||
* it was not made under the protection of RCU, cgroup_mutex or
|
||||
* threadgroup_change_begin(), so it might no longer be a valid
|
||||
* cgroup pointer. cgroup_attach_task() might have already changed
|
||||
* current->cgroups, allowing the previously referenced cgroup
|
||||
* group to be removed and freed.
|
||||
*
|
||||
* Outside the pointer validity we also need to process the css_set
|
||||
* inheritance between threadgoup_change_begin() and
|
||||
* threadgoup_change_end(), this way there is no leak in any process
|
||||
* wide migration performed by cgroup_attach_proc() that could otherwise
|
||||
* miss a thread because it is too early or too late in the fork stage.
|
||||
*
|
||||
* At the point that cgroup_fork() is called, 'current' is the parent
|
||||
* task, and the passed argument 'child' points to the child task.
|
||||
*/
|
||||
void cgroup_fork(struct task_struct *child)
|
||||
{
|
||||
task_lock(current);
|
||||
/*
|
||||
* We don't need to task_lock() current because current->cgroups
|
||||
* can't be changed concurrently here. The parent obviously hasn't
|
||||
* exited and called cgroup_exit(), and we are synchronized against
|
||||
* cgroup migration through threadgroup_change_begin().
|
||||
*/
|
||||
child->cgroups = current->cgroups;
|
||||
get_css_set(child->cgroups);
|
||||
task_unlock(current);
|
||||
INIT_LIST_HEAD(&child->cg_list);
|
||||
}
|
||||
|
||||
@ -4546,10 +4598,19 @@ void cgroup_post_fork(struct task_struct *child)
|
||||
{
|
||||
if (use_task_css_set_links) {
|
||||
write_lock(&css_set_lock);
|
||||
task_lock(child);
|
||||
if (list_empty(&child->cg_list))
|
||||
if (list_empty(&child->cg_list)) {
|
||||
/*
|
||||
* It's safe to use child->cgroups without task_lock()
|
||||
* here because we are protected through
|
||||
* threadgroup_change_begin() against concurrent
|
||||
* css_set change in cgroup_task_migrate(). Also
|
||||
* the task can't exit at that point until
|
||||
* wake_up_new_task() is called, so we are protected
|
||||
* against cgroup_exit() setting child->cgroup to
|
||||
* init_css_set.
|
||||
*/
|
||||
list_add(&child->cg_list, &child->cgroups->tasks);
|
||||
task_unlock(child);
|
||||
}
|
||||
write_unlock(&css_set_lock);
|
||||
}
|
||||
}
|
||||
|
||||
@ -166,13 +166,17 @@ static bool is_task_frozen_enough(struct task_struct *task)
|
||||
*/
|
||||
static int freezer_can_attach(struct cgroup_subsys *ss,
|
||||
struct cgroup *new_cgroup,
|
||||
struct task_struct *task)
|
||||
struct cgroup_taskset *tset)
|
||||
{
|
||||
struct freezer *freezer;
|
||||
struct task_struct *task;
|
||||
|
||||
/*
|
||||
* Anything frozen can't move or be moved to/from.
|
||||
*/
|
||||
cgroup_taskset_for_each(task, new_cgroup, tset)
|
||||
if (cgroup_freezing(task))
|
||||
return -EBUSY;
|
||||
|
||||
freezer = cgroup_freezer(new_cgroup);
|
||||
if (freezer->state != CGROUP_THAWED)
|
||||
@ -181,11 +185,6 @@ static int freezer_can_attach(struct cgroup_subsys *ss,
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int freezer_can_attach_task(struct cgroup *cgrp, struct task_struct *tsk)
|
||||
{
|
||||
return cgroup_freezing(tsk) ? -EBUSY : 0;
|
||||
}
|
||||
|
||||
static void freezer_fork(struct cgroup_subsys *ss, struct task_struct *task)
|
||||
{
|
||||
struct freezer *freezer;
|
||||
@ -381,10 +380,5 @@ struct cgroup_subsys freezer_subsys = {
|
||||
.populate = freezer_populate,
|
||||
.subsys_id = freezer_subsys_id,
|
||||
.can_attach = freezer_can_attach,
|
||||
.can_attach_task = freezer_can_attach_task,
|
||||
.pre_attach = NULL,
|
||||
.attach_task = NULL,
|
||||
.attach = NULL,
|
||||
.fork = freezer_fork,
|
||||
.exit = NULL,
|
||||
};
|
||||
|
||||
107
kernel/cpuset.c
107
kernel/cpuset.c
@ -1389,79 +1389,73 @@ static int fmeter_getrate(struct fmeter *fmp)
|
||||
return val;
|
||||
}
|
||||
|
||||
/* Called by cgroups to determine if a cpuset is usable; cgroup_mutex held */
|
||||
static int cpuset_can_attach(struct cgroup_subsys *ss, struct cgroup *cont,
|
||||
struct task_struct *tsk)
|
||||
{
|
||||
struct cpuset *cs = cgroup_cs(cont);
|
||||
|
||||
if (cpumask_empty(cs->cpus_allowed) || nodes_empty(cs->mems_allowed))
|
||||
return -ENOSPC;
|
||||
|
||||
/*
|
||||
* Kthreads bound to specific cpus cannot be moved to a new cpuset; we
|
||||
* cannot change their cpu affinity and isolating such threads by their
|
||||
* set of allowed nodes is unnecessary. Thus, cpusets are not
|
||||
* applicable for such threads. This prevents checking for success of
|
||||
* set_cpus_allowed_ptr() on all attached tasks before cpus_allowed may
|
||||
* be changed.
|
||||
*/
|
||||
if (tsk->flags & PF_THREAD_BOUND)
|
||||
return -EINVAL;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int cpuset_can_attach_task(struct cgroup *cgrp, struct task_struct *task)
|
||||
{
|
||||
return security_task_setscheduler(task);
|
||||
}
|
||||
|
||||
/*
|
||||
* Protected by cgroup_lock. The nodemasks must be stored globally because
|
||||
* dynamically allocating them is not allowed in pre_attach, and they must
|
||||
* persist among pre_attach, attach_task, and attach.
|
||||
* dynamically allocating them is not allowed in can_attach, and they must
|
||||
* persist until attach.
|
||||
*/
|
||||
static cpumask_var_t cpus_attach;
|
||||
static nodemask_t cpuset_attach_nodemask_from;
|
||||
static nodemask_t cpuset_attach_nodemask_to;
|
||||
|
||||
/* Set-up work for before attaching each task. */
|
||||
static void cpuset_pre_attach(struct cgroup *cont)
|
||||
/* Called by cgroups to determine if a cpuset is usable; cgroup_mutex held */
|
||||
static int cpuset_can_attach(struct cgroup_subsys *ss, struct cgroup *cgrp,
|
||||
struct cgroup_taskset *tset)
|
||||
{
|
||||
struct cpuset *cs = cgroup_cs(cont);
|
||||
struct cpuset *cs = cgroup_cs(cgrp);
|
||||
struct task_struct *task;
|
||||
int ret;
|
||||
|
||||
if (cpumask_empty(cs->cpus_allowed) || nodes_empty(cs->mems_allowed))
|
||||
return -ENOSPC;
|
||||
|
||||
cgroup_taskset_for_each(task, cgrp, tset) {
|
||||
/*
|
||||
* Kthreads bound to specific cpus cannot be moved to a new
|
||||
* cpuset; we cannot change their cpu affinity and
|
||||
* isolating such threads by their set of allowed nodes is
|
||||
* unnecessary. Thus, cpusets are not applicable for such
|
||||
* threads. This prevents checking for success of
|
||||
* set_cpus_allowed_ptr() on all attached tasks before
|
||||
* cpus_allowed may be changed.
|
||||
*/
|
||||
if (task->flags & PF_THREAD_BOUND)
|
||||
return -EINVAL;
|
||||
if ((ret = security_task_setscheduler(task)))
|
||||
return ret;
|
||||
}
|
||||
|
||||
/* prepare for attach */
|
||||
if (cs == &top_cpuset)
|
||||
cpumask_copy(cpus_attach, cpu_possible_mask);
|
||||
else
|
||||
guarantee_online_cpus(cs, cpus_attach);
|
||||
|
||||
guarantee_online_mems(cs, &cpuset_attach_nodemask_to);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* Per-thread attachment work. */
|
||||
static void cpuset_attach_task(struct cgroup *cont, struct task_struct *tsk)
|
||||
{
|
||||
int err;
|
||||
struct cpuset *cs = cgroup_cs(cont);
|
||||
|
||||
/*
|
||||
* can_attach beforehand should guarantee that this doesn't fail.
|
||||
* TODO: have a better way to handle failure here
|
||||
*/
|
||||
err = set_cpus_allowed_ptr(tsk, cpus_attach);
|
||||
WARN_ON_ONCE(err);
|
||||
|
||||
cpuset_change_task_nodemask(tsk, &cpuset_attach_nodemask_to);
|
||||
cpuset_update_task_spread_flag(cs, tsk);
|
||||
}
|
||||
|
||||
static void cpuset_attach(struct cgroup_subsys *ss, struct cgroup *cont,
|
||||
struct cgroup *oldcont, struct task_struct *tsk)
|
||||
static void cpuset_attach(struct cgroup_subsys *ss, struct cgroup *cgrp,
|
||||
struct cgroup_taskset *tset)
|
||||
{
|
||||
struct mm_struct *mm;
|
||||
struct cpuset *cs = cgroup_cs(cont);
|
||||
struct cpuset *oldcs = cgroup_cs(oldcont);
|
||||
struct task_struct *task;
|
||||
struct task_struct *leader = cgroup_taskset_first(tset);
|
||||
struct cgroup *oldcgrp = cgroup_taskset_cur_cgroup(tset);
|
||||
struct cpuset *cs = cgroup_cs(cgrp);
|
||||
struct cpuset *oldcs = cgroup_cs(oldcgrp);
|
||||
|
||||
cgroup_taskset_for_each(task, cgrp, tset) {
|
||||
/*
|
||||
* can_attach beforehand should guarantee that this doesn't
|
||||
* fail. TODO: have a better way to handle failure here
|
||||
*/
|
||||
WARN_ON_ONCE(set_cpus_allowed_ptr(task, cpus_attach));
|
||||
|
||||
cpuset_change_task_nodemask(task, &cpuset_attach_nodemask_to);
|
||||
cpuset_update_task_spread_flag(cs, task);
|
||||
}
|
||||
|
||||
/*
|
||||
* Change mm, possibly for multiple threads in a threadgroup. This is
|
||||
@ -1469,7 +1463,7 @@ static void cpuset_attach(struct cgroup_subsys *ss, struct cgroup *cont,
|
||||
*/
|
||||
cpuset_attach_nodemask_from = oldcs->mems_allowed;
|
||||
cpuset_attach_nodemask_to = cs->mems_allowed;
|
||||
mm = get_task_mm(tsk);
|
||||
mm = get_task_mm(leader);
|
||||
if (mm) {
|
||||
mpol_rebind_mm(mm, &cpuset_attach_nodemask_to);
|
||||
if (is_memory_migrate(cs))
|
||||
@ -1925,9 +1919,6 @@ struct cgroup_subsys cpuset_subsys = {
|
||||
.create = cpuset_create,
|
||||
.destroy = cpuset_destroy,
|
||||
.can_attach = cpuset_can_attach,
|
||||
.can_attach_task = cpuset_can_attach_task,
|
||||
.pre_attach = cpuset_pre_attach,
|
||||
.attach_task = cpuset_attach_task,
|
||||
.attach = cpuset_attach,
|
||||
.populate = cpuset_populate,
|
||||
.post_clone = cpuset_post_clone,
|
||||
|
||||
@ -6941,10 +6941,13 @@ static int __perf_cgroup_move(void *info)
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void
|
||||
perf_cgroup_attach_task(struct cgroup *cgrp, struct task_struct *task)
|
||||
static void perf_cgroup_attach(struct cgroup_subsys *ss, struct cgroup *cgrp,
|
||||
struct cgroup_taskset *tset)
|
||||
{
|
||||
task_function_call(task, __perf_cgroup_move, task);
|
||||
struct task_struct *task;
|
||||
|
||||
cgroup_taskset_for_each(task, cgrp, tset)
|
||||
task_function_call(task, __perf_cgroup_move, task);
|
||||
}
|
||||
|
||||
static void perf_cgroup_exit(struct cgroup_subsys *ss, struct cgroup *cgrp,
|
||||
@ -6958,7 +6961,7 @@ static void perf_cgroup_exit(struct cgroup_subsys *ss, struct cgroup *cgrp,
|
||||
if (!(task->flags & PF_EXITING))
|
||||
return;
|
||||
|
||||
perf_cgroup_attach_task(cgrp, task);
|
||||
task_function_call(task, __perf_cgroup_move, task);
|
||||
}
|
||||
|
||||
struct cgroup_subsys perf_subsys = {
|
||||
@ -6967,6 +6970,6 @@ struct cgroup_subsys perf_subsys = {
|
||||
.create = perf_cgroup_create,
|
||||
.destroy = perf_cgroup_destroy,
|
||||
.exit = perf_cgroup_exit,
|
||||
.attach_task = perf_cgroup_attach_task,
|
||||
.attach = perf_cgroup_attach,
|
||||
};
|
||||
#endif /* CONFIG_CGROUP_PERF */
|
||||
|
||||
@ -972,7 +972,7 @@ static int copy_signal(unsigned long clone_flags, struct task_struct *tsk)
|
||||
sched_autogroup_fork(sig);
|
||||
|
||||
#ifdef CONFIG_CGROUPS
|
||||
init_rwsem(&sig->threadgroup_fork_lock);
|
||||
init_rwsem(&sig->group_rwsem);
|
||||
#endif
|
||||
|
||||
sig->oom_adj = current->signal->oom_adj;
|
||||
@ -1153,7 +1153,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
|
||||
p->io_context = NULL;
|
||||
p->audit_context = NULL;
|
||||
if (clone_flags & CLONE_THREAD)
|
||||
threadgroup_fork_read_lock(current);
|
||||
threadgroup_change_begin(current);
|
||||
cgroup_fork(p);
|
||||
#ifdef CONFIG_NUMA
|
||||
p->mempolicy = mpol_dup(p->mempolicy);
|
||||
@ -1368,7 +1368,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
|
||||
proc_fork_connector(p);
|
||||
cgroup_post_fork(p);
|
||||
if (clone_flags & CLONE_THREAD)
|
||||
threadgroup_fork_read_unlock(current);
|
||||
threadgroup_change_end(current);
|
||||
perf_event_fork(p);
|
||||
return p;
|
||||
|
||||
@ -1403,7 +1403,7 @@ bad_fork_cleanup_policy:
|
||||
bad_fork_cleanup_cgroup:
|
||||
#endif
|
||||
if (clone_flags & CLONE_THREAD)
|
||||
threadgroup_fork_read_unlock(current);
|
||||
threadgroup_change_end(current);
|
||||
cgroup_exit(p, cgroup_callbacks_done);
|
||||
delayacct_tsk_free(p);
|
||||
module_put(task_thread_info(p)->exec_domain->module);
|
||||
|
||||
@ -159,8 +159,7 @@ int res_counter_memparse_write_strategy(const char *buf,
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* FIXME - make memparse() take const char* args */
|
||||
*res = memparse((char *)buf, &end);
|
||||
*res = memparse(buf, &end);
|
||||
if (*end != '\0')
|
||||
return -EINVAL;
|
||||
|
||||
|
||||
@ -7563,24 +7563,31 @@ cpu_cgroup_destroy(struct cgroup_subsys *ss, struct cgroup *cgrp)
|
||||
sched_destroy_group(tg);
|
||||
}
|
||||
|
||||
static int
|
||||
cpu_cgroup_can_attach_task(struct cgroup *cgrp, struct task_struct *tsk)
|
||||
static int cpu_cgroup_can_attach(struct cgroup_subsys *ss, struct cgroup *cgrp,
|
||||
struct cgroup_taskset *tset)
|
||||
{
|
||||
struct task_struct *task;
|
||||
|
||||
cgroup_taskset_for_each(task, cgrp, tset) {
|
||||
#ifdef CONFIG_RT_GROUP_SCHED
|
||||
if (!sched_rt_can_attach(cgroup_tg(cgrp), tsk))
|
||||
return -EINVAL;
|
||||
if (!sched_rt_can_attach(cgroup_tg(cgrp), task))
|
||||
return -EINVAL;
|
||||
#else
|
||||
/* We don't support RT-tasks being in separate groups */
|
||||
if (tsk->sched_class != &fair_sched_class)
|
||||
return -EINVAL;
|
||||
/* We don't support RT-tasks being in separate groups */
|
||||
if (task->sched_class != &fair_sched_class)
|
||||
return -EINVAL;
|
||||
#endif
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void
|
||||
cpu_cgroup_attach_task(struct cgroup *cgrp, struct task_struct *tsk)
|
||||
static void cpu_cgroup_attach(struct cgroup_subsys *ss, struct cgroup *cgrp,
|
||||
struct cgroup_taskset *tset)
|
||||
{
|
||||
sched_move_task(tsk);
|
||||
struct task_struct *task;
|
||||
|
||||
cgroup_taskset_for_each(task, cgrp, tset)
|
||||
sched_move_task(task);
|
||||
}
|
||||
|
||||
static void
|
||||
@ -7915,8 +7922,8 @@ struct cgroup_subsys cpu_cgroup_subsys = {
|
||||
.name = "cpu",
|
||||
.create = cpu_cgroup_create,
|
||||
.destroy = cpu_cgroup_destroy,
|
||||
.can_attach_task = cpu_cgroup_can_attach_task,
|
||||
.attach_task = cpu_cgroup_attach_task,
|
||||
.can_attach = cpu_cgroup_can_attach,
|
||||
.attach = cpu_cgroup_attach,
|
||||
.exit = cpu_cgroup_exit,
|
||||
.populate = cpu_cgroup_populate,
|
||||
.subsys_id = cpu_cgroup_subsys_id,
|
||||
|
||||
@ -2355,8 +2355,15 @@ void exit_signals(struct task_struct *tsk)
|
||||
int group_stop = 0;
|
||||
sigset_t unblocked;
|
||||
|
||||
/*
|
||||
* @tsk is about to have PF_EXITING set - lock out users which
|
||||
* expect stable threadgroup.
|
||||
*/
|
||||
threadgroup_change_begin(tsk);
|
||||
|
||||
if (thread_group_empty(tsk) || signal_group_exit(tsk->signal)) {
|
||||
tsk->flags |= PF_EXITING;
|
||||
threadgroup_change_end(tsk);
|
||||
return;
|
||||
}
|
||||
|
||||
@ -2366,6 +2373,9 @@ void exit_signals(struct task_struct *tsk)
|
||||
* see wants_signal(), do_signal_stop().
|
||||
*/
|
||||
tsk->flags |= PF_EXITING;
|
||||
|
||||
threadgroup_change_end(tsk);
|
||||
|
||||
if (!signal_pending(tsk))
|
||||
goto out;
|
||||
|
||||
|
||||
@ -5391,8 +5391,9 @@ static void mem_cgroup_clear_mc(void)
|
||||
|
||||
static int mem_cgroup_can_attach(struct cgroup_subsys *ss,
|
||||
struct cgroup *cgroup,
|
||||
struct task_struct *p)
|
||||
struct cgroup_taskset *tset)
|
||||
{
|
||||
struct task_struct *p = cgroup_taskset_first(tset);
|
||||
int ret = 0;
|
||||
struct mem_cgroup *memcg = mem_cgroup_from_cont(cgroup);
|
||||
|
||||
@ -5430,7 +5431,7 @@ static int mem_cgroup_can_attach(struct cgroup_subsys *ss,
|
||||
|
||||
static void mem_cgroup_cancel_attach(struct cgroup_subsys *ss,
|
||||
struct cgroup *cgroup,
|
||||
struct task_struct *p)
|
||||
struct cgroup_taskset *tset)
|
||||
{
|
||||
mem_cgroup_clear_mc();
|
||||
}
|
||||
@ -5547,9 +5548,9 @@ retry:
|
||||
|
||||
static void mem_cgroup_move_task(struct cgroup_subsys *ss,
|
||||
struct cgroup *cont,
|
||||
struct cgroup *old_cont,
|
||||
struct task_struct *p)
|
||||
struct cgroup_taskset *tset)
|
||||
{
|
||||
struct task_struct *p = cgroup_taskset_first(tset);
|
||||
struct mm_struct *mm = get_task_mm(p);
|
||||
|
||||
if (mm) {
|
||||
@ -5564,19 +5565,18 @@ static void mem_cgroup_move_task(struct cgroup_subsys *ss,
|
||||
#else /* !CONFIG_MMU */
|
||||
static int mem_cgroup_can_attach(struct cgroup_subsys *ss,
|
||||
struct cgroup *cgroup,
|
||||
struct task_struct *p)
|
||||
struct cgroup_taskset *tset)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
static void mem_cgroup_cancel_attach(struct cgroup_subsys *ss,
|
||||
struct cgroup *cgroup,
|
||||
struct task_struct *p)
|
||||
struct cgroup_taskset *tset)
|
||||
{
|
||||
}
|
||||
static void mem_cgroup_move_task(struct cgroup_subsys *ss,
|
||||
struct cgroup *cont,
|
||||
struct cgroup *old_cont,
|
||||
struct task_struct *p)
|
||||
struct cgroup_taskset *tset)
|
||||
{
|
||||
}
|
||||
#endif
|
||||
|
||||
@ -62,11 +62,12 @@ static inline struct dev_cgroup *task_devcgroup(struct task_struct *task)
|
||||
struct cgroup_subsys devices_subsys;
|
||||
|
||||
static int devcgroup_can_attach(struct cgroup_subsys *ss,
|
||||
struct cgroup *new_cgroup, struct task_struct *task)
|
||||
struct cgroup *new_cgrp, struct cgroup_taskset *set)
|
||||
{
|
||||
if (current != task && !capable(CAP_SYS_ADMIN))
|
||||
return -EPERM;
|
||||
struct task_struct *task = cgroup_taskset_first(set);
|
||||
|
||||
if (current != task && !capable(CAP_SYS_ADMIN))
|
||||
return -EPERM;
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user