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block/blk-cgroup.c
37.6 KB
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/* * Common Block IO controller cgroup interface * * Based on ideas and code from CFQ, CFS and BFQ: * Copyright (C) 2003 Jens Axboe <axboe@kernel.dk> * * Copyright (C) 2008 Fabio Checconi <fabio@gandalf.sssup.it> * Paolo Valente <paolo.valente@unimore.it> * * Copyright (C) 2009 Vivek Goyal <vgoyal@redhat.com> * Nauman Rafique <nauman@google.com> |
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* * For policy-specific per-blkcg data: * Copyright (C) 2015 Paolo Valente <paolo.valente@unimore.it> * Arianna Avanzini <avanzini.arianna@gmail.com> |
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*/ #include <linux/ioprio.h> |
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#include <linux/kdev_t.h> |
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#include <linux/module.h> |
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#include <linux/sched/signal.h> |
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#include <linux/err.h> |
9195291e5 blkio: Increment ... |
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#include <linux/blkdev.h> |
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#include <linux/backing-dev.h> |
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#include <linux/slab.h> |
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#include <linux/genhd.h> |
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#include <linux/delay.h> |
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#include <linux/atomic.h> |
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#include <linux/ctype.h> |
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#include <linux/blk-cgroup.h> |
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#include "blk.h" |
3e2520668 blkio: Implement ... |
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|
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#define MAX_KEY_LEN 100 |
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/* * blkcg_pol_mutex protects blkcg_policy[] and policy [de]activation. * blkcg_pol_register_mutex nests outside of it and synchronizes entire * policy [un]register operations including cgroup file additions / * removals. Putting cgroup file registration outside blkcg_pol_mutex * allows grabbing it from cgroup callbacks. */ static DEFINE_MUTEX(blkcg_pol_register_mutex); |
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static DEFINE_MUTEX(blkcg_pol_mutex); |
923adde1b blkcg: clear all ... |
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|
e48453c38 block, cgroup: im... |
43 |
struct blkcg blkcg_root; |
3c798398e blkcg: mass renam... |
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EXPORT_SYMBOL_GPL(blkcg_root); |
9d6a986c0 blkio: Export som... |
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|
496d5e756 blkcg: add blkcg_... |
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struct cgroup_subsys_state * const blkcg_root_css = &blkcg_root.css; |
3c798398e blkcg: mass renam... |
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static struct blkcg_policy *blkcg_policy[BLKCG_MAX_POLS]; |
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|
7876f930d blkcg: implement ... |
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static LIST_HEAD(all_blkcgs); /* protected by blkcg_pol_mutex */ |
a2b1693ba blkcg: implement ... |
50 |
static bool blkcg_policy_enabled(struct request_queue *q, |
3c798398e blkcg: mass renam... |
51 |
const struct blkcg_policy *pol) |
a2b1693ba blkcg: implement ... |
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{ return pol && test_bit(pol->plid, q->blkcg_pols); } |
0381411e4 blkcg: let blkcg ... |
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/** * blkg_free - free a blkg * @blkg: blkg to free * * Free @blkg which may be partially allocated. */ |
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static void blkg_free(struct blkcg_gq *blkg) |
0381411e4 blkcg: let blkcg ... |
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{ |
e8989fae3 blkcg: unify blkg... |
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int i; |
549d3aa87 blkcg: make blkg-... |
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if (!blkg) return; |
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for (i = 0; i < BLKCG_MAX_POLS; i++) |
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if (blkg->pd[i]) blkcg_policy[i]->pd_free_fn(blkg->pd[i]); |
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|
994b78327 blkcg: use blkg_f... |
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if (blkg->blkcg != &blkcg_root) |
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blk_exit_rl(blkg->q, &blkg->rl); |
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blkg_rwstat_exit(&blkg->stat_ios); blkg_rwstat_exit(&blkg->stat_bytes); |
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kfree(blkg); |
0381411e4 blkcg: let blkcg ... |
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} /** * blkg_alloc - allocate a blkg * @blkcg: block cgroup the new blkg is associated with * @q: request_queue the new blkg is associated with |
159749937 blkcg: make root ... |
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* @gfp_mask: allocation mask to use |
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* |
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* Allocate a new blkg assocating @blkcg and @q. |
0381411e4 blkcg: let blkcg ... |
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*/ |
159749937 blkcg: make root ... |
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static struct blkcg_gq *blkg_alloc(struct blkcg *blkcg, struct request_queue *q, gfp_t gfp_mask) |
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{ |
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struct blkcg_gq *blkg; |
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int i; |
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/* alloc and init base part */ |
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blkg = kzalloc_node(sizeof(*blkg), gfp_mask, q->node); |
0381411e4 blkcg: let blkcg ... |
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if (!blkg) return NULL; |
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if (blkg_rwstat_init(&blkg->stat_bytes, gfp_mask) || blkg_rwstat_init(&blkg->stat_ios, gfp_mask)) goto err_free; |
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blkg->q = q; |
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INIT_LIST_HEAD(&blkg->q_node); |
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blkg->blkcg = blkcg; |
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atomic_set(&blkg->refcnt, 1); |
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|
a051661ca blkcg: implement ... |
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/* root blkg uses @q->root_rl, init rl only for !root blkgs */ if (blkcg != &blkcg_root) { if (blk_init_rl(&blkg->rl, q, gfp_mask)) goto err_free; blkg->rl.blkg = blkg; } |
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for (i = 0; i < BLKCG_MAX_POLS; i++) { |
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struct blkcg_policy *pol = blkcg_policy[i]; |
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struct blkg_policy_data *pd; |
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|
a2b1693ba blkcg: implement ... |
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if (!blkcg_policy_enabled(q, pol)) |
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continue; /* alloc per-policy data and attach it to blkg */ |
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pd = pol->pd_alloc_fn(gfp_mask, q->node); |
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if (!pd) goto err_free; |
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|
e8989fae3 blkcg: unify blkg... |
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blkg->pd[i] = pd; pd->blkg = blkg; |
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pd->plid = i; |
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} |
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return blkg; |
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err_free: blkg_free(blkg); return NULL; |
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} |
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struct blkcg_gq *blkg_lookup_slowpath(struct blkcg *blkcg, struct request_queue *q, bool update_hint) |
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{ |
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struct blkcg_gq *blkg; |
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|
a637120e4 blkcg: use radix ... |
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/* |
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* Hint didn't match. Look up from the radix tree. Note that the * hint can only be updated under queue_lock as otherwise @blkg * could have already been removed from blkg_tree. The caller is * responsible for grabbing queue_lock if @update_hint. |
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*/ blkg = radix_tree_lookup(&blkcg->blkg_tree, q->id); |
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if (blkg && blkg->q == q) { if (update_hint) { lockdep_assert_held(q->queue_lock); rcu_assign_pointer(blkcg->blkg_hint, blkg); } |
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return blkg; |
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} |
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|
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return NULL; } |
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EXPORT_SYMBOL_GPL(blkg_lookup_slowpath); |
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|
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/* |
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* If @new_blkg is %NULL, this function tries to allocate a new one as * necessary using %GFP_NOWAIT. @new_blkg is always consumed on return. |
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*/ |
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static struct blkcg_gq *blkg_create(struct blkcg *blkcg, |
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struct request_queue *q, struct blkcg_gq *new_blkg) |
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{ |
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struct blkcg_gq *blkg; |
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struct bdi_writeback_congested *wb_congested; |
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int i, ret; |
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|
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WARN_ON_ONCE(!rcu_read_lock_held()); lockdep_assert_held(q->queue_lock); |
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/* blkg holds a reference to blkcg */ |
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if (!css_tryget_online(&blkcg->css)) { |
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ret = -ENODEV; |
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goto err_free_blkg; |
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} |
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|
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wb_congested = wb_congested_get_create(q->backing_dev_info, |
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blkcg->css.id, GFP_NOWAIT | __GFP_NOWARN); if (!wb_congested) { |
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ret = -ENOMEM; |
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goto err_put_css; |
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} |
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/* allocate */ if (!new_blkg) { new_blkg = blkg_alloc(blkcg, q, GFP_NOWAIT | __GFP_NOWARN); if (unlikely(!new_blkg)) { ret = -ENOMEM; goto err_put_congested; |
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} } |
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blkg = new_blkg; blkg->wb_congested = wb_congested; |
cd1604fab blkcg: factor out... |
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|
db6136703 blkcg: invoke blk... |
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/* link parent */ |
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if (blkcg_parent(blkcg)) { blkg->parent = __blkg_lookup(blkcg_parent(blkcg), q, false); if (WARN_ON_ONCE(!blkg->parent)) { |
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ret = -ENODEV; |
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goto err_put_congested; |
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} blkg_get(blkg->parent); } |
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/* invoke per-policy init */ for (i = 0; i < BLKCG_MAX_POLS; i++) { struct blkcg_policy *pol = blkcg_policy[i]; if (blkg->pd[i] && pol->pd_init_fn) |
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pol->pd_init_fn(blkg->pd[i]); |
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} /* insert */ |
cd1604fab blkcg: factor out... |
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spin_lock(&blkcg->lock); |
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ret = radix_tree_insert(&blkcg->blkg_tree, q->id, blkg); if (likely(!ret)) { hlist_add_head_rcu(&blkg->blkcg_node, &blkcg->blkg_list); list_add(&blkg->q_node, &q->blkg_list); |
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for (i = 0; i < BLKCG_MAX_POLS; i++) { struct blkcg_policy *pol = blkcg_policy[i]; if (blkg->pd[i] && pol->pd_online_fn) |
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pol->pd_online_fn(blkg->pd[i]); |
f427d9096 blkcg: implement ... |
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} |
a637120e4 blkcg: use radix ... |
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} |
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blkg->online = true; |
cd1604fab blkcg: factor out... |
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spin_unlock(&blkcg->lock); |
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|
ec13b1d6f blkcg: always cre... |
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if (!ret) |
a637120e4 blkcg: use radix ... |
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return blkg; |
159749937 blkcg: make root ... |
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|
3c5478659 blkcg: make blkcg... |
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/* @blkg failed fully initialized, use the usual release path */ blkg_put(blkg); return ERR_PTR(ret); |
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err_put_congested: wb_congested_put(wb_congested); err_put_css: |
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css_put(&blkcg->css); |
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err_free_blkg: |
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blkg_free(new_blkg); |
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return ERR_PTR(ret); |
31e4c28d9 blkio: Introduce ... |
242 |
} |
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|
86cde6b62 blkcg: reorganize... |
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/** |
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* blkg_lookup_create - lookup blkg, try to create one if not there |
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* @blkcg: blkcg of interest * @q: request_queue of interest * * Lookup blkg for the @blkcg - @q pair. If it doesn't exist, try to |
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* create one. blkg creation is performed recursively from blkcg_root such * that all non-root blkg's have access to the parent blkg. This function * should be called under RCU read lock and @q->queue_lock. |
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* * Returns pointer to the looked up or created blkg on success, ERR_PTR() * value on error. If @q is dead, returns ERR_PTR(-EINVAL). If @q is not * dead and bypassing, returns ERR_PTR(-EBUSY). */ |
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struct blkcg_gq *blkg_lookup_create(struct blkcg *blkcg, struct request_queue *q) |
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{ |
86cde6b62 blkcg: reorganize... |
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struct blkcg_gq *blkg; WARN_ON_ONCE(!rcu_read_lock_held()); lockdep_assert_held(q->queue_lock); |
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/* * This could be the first entry point of blkcg implementation and * we shouldn't allow anything to go through for a bypassing queue. */ if (unlikely(blk_queue_bypass(q))) return ERR_PTR(blk_queue_dying(q) ? -ENODEV : -EBUSY); |
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blkg = __blkg_lookup(blkcg, q, true); if (blkg) return blkg; |
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/* * Create blkgs walking down from blkcg_root to @blkcg, so that all * non-root blkgs have access to their parents. */ while (true) { struct blkcg *pos = blkcg; struct blkcg *parent = blkcg_parent(blkcg); while (parent && !__blkg_lookup(parent, q, false)) { pos = parent; parent = blkcg_parent(parent); } |
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blkg = blkg_create(pos, q, NULL); |
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if (pos == blkcg || IS_ERR(blkg)) return blkg; } |
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} |
31e4c28d9 blkio: Introduce ... |
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|
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static void blkg_destroy(struct blkcg_gq *blkg) |
03aa264ac blkcg: let blkcg ... |
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{ |
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struct blkcg *blkcg = blkg->blkcg; |
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struct blkcg_gq *parent = blkg->parent; |
f427d9096 blkcg: implement ... |
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int i; |
03aa264ac blkcg: let blkcg ... |
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|
27e1f9d1c blkcg: drop local... |
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lockdep_assert_held(blkg->q->queue_lock); |
9f13ef678 blkcg: use double... |
299 |
lockdep_assert_held(&blkcg->lock); |
03aa264ac blkcg: let blkcg ... |
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/* Something wrong if we are trying to remove same group twice */ |
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WARN_ON_ONCE(list_empty(&blkg->q_node)); |
9f13ef678 blkcg: use double... |
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WARN_ON_ONCE(hlist_unhashed(&blkg->blkcg_node)); |
a637120e4 blkcg: use radix ... |
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|
f427d9096 blkcg: implement ... |
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for (i = 0; i < BLKCG_MAX_POLS; i++) { struct blkcg_policy *pol = blkcg_policy[i]; if (blkg->pd[i] && pol->pd_offline_fn) |
a9520cd6f blkcg: make blkcg... |
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pol->pd_offline_fn(blkg->pd[i]); |
f427d9096 blkcg: implement ... |
310 |
} |
77ea73388 blkcg: move io_se... |
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if (parent) { blkg_rwstat_add_aux(&parent->stat_bytes, &blkg->stat_bytes); blkg_rwstat_add_aux(&parent->stat_ios, &blkg->stat_ios); } |
f427d9096 blkcg: implement ... |
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blkg->online = false; |
a637120e4 blkcg: use radix ... |
317 |
radix_tree_delete(&blkcg->blkg_tree, blkg->q->id); |
e8989fae3 blkcg: unify blkg... |
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list_del_init(&blkg->q_node); |
9f13ef678 blkcg: use double... |
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hlist_del_init_rcu(&blkg->blkcg_node); |
03aa264ac blkcg: let blkcg ... |
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|
03aa264ac blkcg: let blkcg ... |
321 |
/* |
a637120e4 blkcg: use radix ... |
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* Both setting lookup hint to and clearing it from @blkg are done * under queue_lock. If it's not pointing to @blkg now, it never * will. Hint assignment itself can race safely. */ |
ec6c676a0 block: Substitute... |
326 |
if (rcu_access_pointer(blkcg->blkg_hint) == blkg) |
a637120e4 blkcg: use radix ... |
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rcu_assign_pointer(blkcg->blkg_hint, NULL); /* |
03aa264ac blkcg: let blkcg ... |
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* Put the reference taken at the time of creation so that when all * queues are gone, group can be destroyed. */ blkg_put(blkg); } |
9f13ef678 blkcg: use double... |
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/** * blkg_destroy_all - destroy all blkgs associated with a request_queue * @q: request_queue of interest |
9f13ef678 blkcg: use double... |
338 |
* |
3c96cb32d blkcg: drop stuff... |
339 |
* Destroy all blkgs associated with @q. |
9f13ef678 blkcg: use double... |
340 |
*/ |
3c96cb32d blkcg: drop stuff... |
341 |
static void blkg_destroy_all(struct request_queue *q) |
72e06c255 blkcg: shoot down... |
342 |
{ |
3c798398e blkcg: mass renam... |
343 |
struct blkcg_gq *blkg, *n; |
72e06c255 blkcg: shoot down... |
344 |
|
6d18b008d blkcg: shoot down... |
345 |
lockdep_assert_held(q->queue_lock); |
72e06c255 blkcg: shoot down... |
346 |
|
9f13ef678 blkcg: use double... |
347 |
list_for_each_entry_safe(blkg, n, &q->blkg_list, q_node) { |
3c798398e blkcg: mass renam... |
348 |
struct blkcg *blkcg = blkg->blkcg; |
72e06c255 blkcg: shoot down... |
349 |
|
9f13ef678 blkcg: use double... |
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spin_lock(&blkcg->lock); blkg_destroy(blkg); spin_unlock(&blkcg->lock); |
72e06c255 blkcg: shoot down... |
353 |
} |
6fe810bda block: blkg_destr... |
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q->root_blkg = NULL; q->root_rl.blkg = NULL; |
72e06c255 blkcg: shoot down... |
357 |
} |
2a4fd070e blkcg: move bulk ... |
358 359 360 361 362 363 364 365 366 |
/* * A group is RCU protected, but having an rcu lock does not mean that one * can access all the fields of blkg and assume these are valid. For * example, don't try to follow throtl_data and request queue links. * * Having a reference to blkg under an rcu allows accesses to only values * local to groups like group stats and group rate limits. */ void __blkg_release_rcu(struct rcu_head *rcu_head) |
1adaf3dde blkcg: move refcn... |
367 |
{ |
2a4fd070e blkcg: move bulk ... |
368 |
struct blkcg_gq *blkg = container_of(rcu_head, struct blkcg_gq, rcu_head); |
db6136703 blkcg: invoke blk... |
369 |
|
3c5478659 blkcg: make blkcg... |
370 |
/* release the blkcg and parent blkg refs this blkg has been holding */ |
1adaf3dde blkcg: move refcn... |
371 |
css_put(&blkg->blkcg->css); |
a5049a8ae blkcg: fix use-af... |
372 |
if (blkg->parent) |
3c5478659 blkcg: make blkcg... |
373 |
blkg_put(blkg->parent); |
1adaf3dde blkcg: move refcn... |
374 |
|
ce7acfeaf writeback, blkcg:... |
375 |
wb_congested_put(blkg->wb_congested); |
2a4fd070e blkcg: move bulk ... |
376 |
blkg_free(blkg); |
1adaf3dde blkcg: move refcn... |
377 |
} |
2a4fd070e blkcg: move bulk ... |
378 |
EXPORT_SYMBOL_GPL(__blkg_release_rcu); |
1adaf3dde blkcg: move refcn... |
379 |
|
a051661ca blkcg: implement ... |
380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 |
/* * The next function used by blk_queue_for_each_rl(). It's a bit tricky * because the root blkg uses @q->root_rl instead of its own rl. */ struct request_list *__blk_queue_next_rl(struct request_list *rl, struct request_queue *q) { struct list_head *ent; struct blkcg_gq *blkg; /* * Determine the current blkg list_head. The first entry is * root_rl which is off @q->blkg_list and mapped to the head. */ if (rl == &q->root_rl) { ent = &q->blkg_list; |
65c77fd9e blkcg: stop itera... |
396 397 398 |
/* There are no more block groups, hence no request lists */ if (list_empty(ent)) return NULL; |
a051661ca blkcg: implement ... |
399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 |
} else { blkg = container_of(rl, struct blkcg_gq, rl); ent = &blkg->q_node; } /* walk to the next list_head, skip root blkcg */ ent = ent->next; if (ent == &q->root_blkg->q_node) ent = ent->next; if (ent == &q->blkg_list) return NULL; blkg = container_of(ent, struct blkcg_gq, q_node); return &blkg->rl; } |
182446d08 cgroup: pass arou... |
414 415 |
static int blkcg_reset_stats(struct cgroup_subsys_state *css, struct cftype *cftype, u64 val) |
303a3acb2 blkio: Add io con... |
416 |
{ |
182446d08 cgroup: pass arou... |
417 |
struct blkcg *blkcg = css_to_blkcg(css); |
3c798398e blkcg: mass renam... |
418 |
struct blkcg_gq *blkg; |
bc0d6501a blkcg: kill blkio... |
419 |
int i; |
303a3acb2 blkio: Add io con... |
420 |
|
838f13bf4 blkcg: allow blkc... |
421 |
mutex_lock(&blkcg_pol_mutex); |
303a3acb2 blkio: Add io con... |
422 |
spin_lock_irq(&blkcg->lock); |
997a026c8 blkcg: simplify s... |
423 424 425 426 427 428 |
/* * Note that stat reset is racy - it doesn't synchronize against * stat updates. This is a debug feature which shouldn't exist * anyway. If you get hit by a race, retry. */ |
b67bfe0d4 hlist: drop the n... |
429 |
hlist_for_each_entry(blkg, &blkcg->blkg_list, blkcg_node) { |
77ea73388 blkcg: move io_se... |
430 431 |
blkg_rwstat_reset(&blkg->stat_bytes); blkg_rwstat_reset(&blkg->stat_ios); |
8bd435b30 blkcg: remove sta... |
432 |
for (i = 0; i < BLKCG_MAX_POLS; i++) { |
3c798398e blkcg: mass renam... |
433 |
struct blkcg_policy *pol = blkcg_policy[i]; |
549d3aa87 blkcg: make blkg-... |
434 |
|
a9520cd6f blkcg: make blkcg... |
435 436 |
if (blkg->pd[i] && pol->pd_reset_stats_fn) pol->pd_reset_stats_fn(blkg->pd[i]); |
bc0d6501a blkcg: kill blkio... |
437 |
} |
303a3acb2 blkio: Add io con... |
438 |
} |
f0bdc8cdd blk-cgroup: Make ... |
439 |
|
303a3acb2 blkio: Add io con... |
440 |
spin_unlock_irq(&blkcg->lock); |
bc0d6501a blkcg: kill blkio... |
441 |
mutex_unlock(&blkcg_pol_mutex); |
303a3acb2 blkio: Add io con... |
442 443 |
return 0; } |
dd165eb3b blkcg: misc prepa... |
444 |
const char *blkg_dev_name(struct blkcg_gq *blkg) |
303a3acb2 blkio: Add io con... |
445 |
{ |
d3d32e69f blkcg: restructur... |
446 |
/* some drivers (floppy) instantiate a queue w/o disk registered */ |
dc3b17cc8 block: Use pointe... |
447 448 |
if (blkg->q->backing_dev_info->dev) return dev_name(blkg->q->backing_dev_info->dev); |
d3d32e69f blkcg: restructur... |
449 |
return NULL; |
303a3acb2 blkio: Add io con... |
450 |
} |
dd165eb3b blkcg: misc prepa... |
451 |
EXPORT_SYMBOL_GPL(blkg_dev_name); |
303a3acb2 blkio: Add io con... |
452 |
|
d3d32e69f blkcg: restructur... |
453 454 455 456 457 458 459 460 461 462 463 |
/** * blkcg_print_blkgs - helper for printing per-blkg data * @sf: seq_file to print to * @blkcg: blkcg of interest * @prfill: fill function to print out a blkg * @pol: policy in question * @data: data to be passed to @prfill * @show_total: to print out sum of prfill return values or not * * This function invokes @prfill on each blkg of @blkcg if pd for the * policy specified by @pol exists. @prfill is invoked with @sf, the |
810ecfa76 blkcg: make blkcg... |
464 465 466 |
* policy data and @data and the matching queue lock held. If @show_total * is %true, the sum of the return values from @prfill is printed with * "Total" label at the end. |
d3d32e69f blkcg: restructur... |
467 468 469 470 |
* * This is to be used to construct print functions for * cftype->read_seq_string method. */ |
3c798398e blkcg: mass renam... |
471 |
void blkcg_print_blkgs(struct seq_file *sf, struct blkcg *blkcg, |
f95a04afa blkcg: embed stru... |
472 473 |
u64 (*prfill)(struct seq_file *, struct blkg_policy_data *, int), |
3c798398e blkcg: mass renam... |
474 |
const struct blkcg_policy *pol, int data, |
ec399347d blkcg: use @pol i... |
475 |
bool show_total) |
5624a4e44 blk-throttle: Mak... |
476 |
{ |
3c798398e blkcg: mass renam... |
477 |
struct blkcg_gq *blkg; |
d3d32e69f blkcg: restructur... |
478 |
u64 total = 0; |
5624a4e44 blk-throttle: Mak... |
479 |
|
810ecfa76 blkcg: make blkcg... |
480 |
rcu_read_lock(); |
ee89f8125 Merge branch 'for... |
481 |
hlist_for_each_entry_rcu(blkg, &blkcg->blkg_list, blkcg_node) { |
810ecfa76 blkcg: make blkcg... |
482 |
spin_lock_irq(blkg->q->queue_lock); |
a2b1693ba blkcg: implement ... |
483 |
if (blkcg_policy_enabled(blkg->q, pol)) |
f95a04afa blkcg: embed stru... |
484 |
total += prfill(sf, blkg->pd[pol->plid], data); |
810ecfa76 blkcg: make blkcg... |
485 486 487 |
spin_unlock_irq(blkg->q->queue_lock); } rcu_read_unlock(); |
d3d32e69f blkcg: restructur... |
488 489 490 491 492 |
if (show_total) seq_printf(sf, "Total %llu ", (unsigned long long)total); } |
829fdb500 blkcg: export con... |
493 |
EXPORT_SYMBOL_GPL(blkcg_print_blkgs); |
d3d32e69f blkcg: restructur... |
494 495 496 497 |
/** * __blkg_prfill_u64 - prfill helper for a single u64 value * @sf: seq_file to print to |
f95a04afa blkcg: embed stru... |
498 |
* @pd: policy private data of interest |
d3d32e69f blkcg: restructur... |
499 500 |
* @v: value to print * |
f95a04afa blkcg: embed stru... |
501 |
* Print @v to @sf for the device assocaited with @pd. |
d3d32e69f blkcg: restructur... |
502 |
*/ |
f95a04afa blkcg: embed stru... |
503 |
u64 __blkg_prfill_u64(struct seq_file *sf, struct blkg_policy_data *pd, u64 v) |
d3d32e69f blkcg: restructur... |
504 |
{ |
f95a04afa blkcg: embed stru... |
505 |
const char *dname = blkg_dev_name(pd->blkg); |
d3d32e69f blkcg: restructur... |
506 507 508 509 510 511 512 513 |
if (!dname) return 0; seq_printf(sf, "%s %llu ", dname, (unsigned long long)v); return v; } |
829fdb500 blkcg: export con... |
514 |
EXPORT_SYMBOL_GPL(__blkg_prfill_u64); |
d3d32e69f blkcg: restructur... |
515 516 517 518 |
/** * __blkg_prfill_rwstat - prfill helper for a blkg_rwstat * @sf: seq_file to print to |
f95a04afa blkcg: embed stru... |
519 |
* @pd: policy private data of interest |
d3d32e69f blkcg: restructur... |
520 521 |
* @rwstat: rwstat to print * |
f95a04afa blkcg: embed stru... |
522 |
* Print @rwstat to @sf for the device assocaited with @pd. |
d3d32e69f blkcg: restructur... |
523 |
*/ |
f95a04afa blkcg: embed stru... |
524 |
u64 __blkg_prfill_rwstat(struct seq_file *sf, struct blkg_policy_data *pd, |
829fdb500 blkcg: export con... |
525 |
const struct blkg_rwstat *rwstat) |
d3d32e69f blkcg: restructur... |
526 527 528 529 530 531 532 |
{ static const char *rwstr[] = { [BLKG_RWSTAT_READ] = "Read", [BLKG_RWSTAT_WRITE] = "Write", [BLKG_RWSTAT_SYNC] = "Sync", [BLKG_RWSTAT_ASYNC] = "Async", }; |
f95a04afa blkcg: embed stru... |
533 |
const char *dname = blkg_dev_name(pd->blkg); |
d3d32e69f blkcg: restructur... |
534 535 536 537 538 539 540 541 542 |
u64 v; int i; if (!dname) return 0; for (i = 0; i < BLKG_RWSTAT_NR; i++) seq_printf(sf, "%s %s %llu ", dname, rwstr[i], |
24bdb8ef0 blkcg: make blkcg... |
543 |
(unsigned long long)atomic64_read(&rwstat->aux_cnt[i])); |
d3d32e69f blkcg: restructur... |
544 |
|
24bdb8ef0 blkcg: make blkcg... |
545 546 |
v = atomic64_read(&rwstat->aux_cnt[BLKG_RWSTAT_READ]) + atomic64_read(&rwstat->aux_cnt[BLKG_RWSTAT_WRITE]); |
d3d32e69f blkcg: restructur... |
547 548 549 550 |
seq_printf(sf, "%s Total %llu ", dname, (unsigned long long)v); return v; } |
b50da39f5 blkcg: export __b... |
551 |
EXPORT_SYMBOL_GPL(__blkg_prfill_rwstat); |
d3d32e69f blkcg: restructur... |
552 |
|
5bc4afb1e blkcg: drop BLKCG... |
553 554 555 |
/** * blkg_prfill_stat - prfill callback for blkg_stat * @sf: seq_file to print to |
f95a04afa blkcg: embed stru... |
556 557 |
* @pd: policy private data of interest * @off: offset to the blkg_stat in @pd |
5bc4afb1e blkcg: drop BLKCG... |
558 559 560 |
* * prfill callback for printing a blkg_stat. */ |
f95a04afa blkcg: embed stru... |
561 |
u64 blkg_prfill_stat(struct seq_file *sf, struct blkg_policy_data *pd, int off) |
d3d32e69f blkcg: restructur... |
562 |
{ |
f95a04afa blkcg: embed stru... |
563 |
return __blkg_prfill_u64(sf, pd, blkg_stat_read((void *)pd + off)); |
d3d32e69f blkcg: restructur... |
564 |
} |
5bc4afb1e blkcg: drop BLKCG... |
565 |
EXPORT_SYMBOL_GPL(blkg_prfill_stat); |
d3d32e69f blkcg: restructur... |
566 |
|
5bc4afb1e blkcg: drop BLKCG... |
567 568 569 |
/** * blkg_prfill_rwstat - prfill callback for blkg_rwstat * @sf: seq_file to print to |
f95a04afa blkcg: embed stru... |
570 571 |
* @pd: policy private data of interest * @off: offset to the blkg_rwstat in @pd |
5bc4afb1e blkcg: drop BLKCG... |
572 573 574 |
* * prfill callback for printing a blkg_rwstat. */ |
f95a04afa blkcg: embed stru... |
575 576 |
u64 blkg_prfill_rwstat(struct seq_file *sf, struct blkg_policy_data *pd, int off) |
d3d32e69f blkcg: restructur... |
577 |
{ |
f95a04afa blkcg: embed stru... |
578 |
struct blkg_rwstat rwstat = blkg_rwstat_read((void *)pd + off); |
d3d32e69f blkcg: restructur... |
579 |
|
f95a04afa blkcg: embed stru... |
580 |
return __blkg_prfill_rwstat(sf, pd, &rwstat); |
d3d32e69f blkcg: restructur... |
581 |
} |
5bc4afb1e blkcg: drop BLKCG... |
582 |
EXPORT_SYMBOL_GPL(blkg_prfill_rwstat); |
d3d32e69f blkcg: restructur... |
583 |
|
77ea73388 blkcg: move io_se... |
584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 |
static u64 blkg_prfill_rwstat_field(struct seq_file *sf, struct blkg_policy_data *pd, int off) { struct blkg_rwstat rwstat = blkg_rwstat_read((void *)pd->blkg + off); return __blkg_prfill_rwstat(sf, pd, &rwstat); } /** * blkg_print_stat_bytes - seq_show callback for blkg->stat_bytes * @sf: seq_file to print to * @v: unused * * To be used as cftype->seq_show to print blkg->stat_bytes. * cftype->private must be set to the blkcg_policy. */ int blkg_print_stat_bytes(struct seq_file *sf, void *v) { blkcg_print_blkgs(sf, css_to_blkcg(seq_css(sf)), blkg_prfill_rwstat_field, (void *)seq_cft(sf)->private, offsetof(struct blkcg_gq, stat_bytes), true); return 0; } EXPORT_SYMBOL_GPL(blkg_print_stat_bytes); /** * blkg_print_stat_bytes - seq_show callback for blkg->stat_ios * @sf: seq_file to print to * @v: unused * * To be used as cftype->seq_show to print blkg->stat_ios. cftype->private * must be set to the blkcg_policy. */ int blkg_print_stat_ios(struct seq_file *sf, void *v) { blkcg_print_blkgs(sf, css_to_blkcg(seq_css(sf)), blkg_prfill_rwstat_field, (void *)seq_cft(sf)->private, offsetof(struct blkcg_gq, stat_ios), true); return 0; } EXPORT_SYMBOL_GPL(blkg_print_stat_ios); static u64 blkg_prfill_rwstat_field_recursive(struct seq_file *sf, struct blkg_policy_data *pd, int off) { struct blkg_rwstat rwstat = blkg_rwstat_recursive_sum(pd->blkg, NULL, off); return __blkg_prfill_rwstat(sf, pd, &rwstat); } /** * blkg_print_stat_bytes_recursive - recursive version of blkg_print_stat_bytes * @sf: seq_file to print to * @v: unused */ int blkg_print_stat_bytes_recursive(struct seq_file *sf, void *v) { blkcg_print_blkgs(sf, css_to_blkcg(seq_css(sf)), blkg_prfill_rwstat_field_recursive, (void *)seq_cft(sf)->private, offsetof(struct blkcg_gq, stat_bytes), true); return 0; } EXPORT_SYMBOL_GPL(blkg_print_stat_bytes_recursive); /** * blkg_print_stat_ios_recursive - recursive version of blkg_print_stat_ios * @sf: seq_file to print to * @v: unused */ int blkg_print_stat_ios_recursive(struct seq_file *sf, void *v) { blkcg_print_blkgs(sf, css_to_blkcg(seq_css(sf)), blkg_prfill_rwstat_field_recursive, (void *)seq_cft(sf)->private, offsetof(struct blkcg_gq, stat_ios), true); return 0; } EXPORT_SYMBOL_GPL(blkg_print_stat_ios_recursive); |
3a8b31d39 blkcg: restructur... |
664 |
/** |
16b3de665 blkcg: implement ... |
665 |
* blkg_stat_recursive_sum - collect hierarchical blkg_stat |
f12c74cab blkcg: make blkg_... |
666 667 668 |
* @blkg: blkg of interest * @pol: blkcg_policy which contains the blkg_stat * @off: offset to the blkg_stat in blkg_policy_data or @blkg |
16b3de665 blkcg: implement ... |
669 |
* |
f12c74cab blkcg: make blkg_... |
670 671 672 673 674 675 |
* Collect the blkg_stat specified by @blkg, @pol and @off and all its * online descendants and their aux counts. The caller must be holding the * queue lock for online tests. * * If @pol is NULL, blkg_stat is at @off bytes into @blkg; otherwise, it is * at @off bytes into @blkg's blkg_policy_data of the policy. |
16b3de665 blkcg: implement ... |
676 |
*/ |
f12c74cab blkcg: make blkg_... |
677 678 |
u64 blkg_stat_recursive_sum(struct blkcg_gq *blkg, struct blkcg_policy *pol, int off) |
16b3de665 blkcg: implement ... |
679 |
{ |
16b3de665 blkcg: implement ... |
680 |
struct blkcg_gq *pos_blkg; |
492eb21b9 cgroup: make hier... |
681 |
struct cgroup_subsys_state *pos_css; |
bd8815a6d cgroup: make css_... |
682 |
u64 sum = 0; |
16b3de665 blkcg: implement ... |
683 |
|
f12c74cab blkcg: make blkg_... |
684 |
lockdep_assert_held(blkg->q->queue_lock); |
16b3de665 blkcg: implement ... |
685 |
|
16b3de665 blkcg: implement ... |
686 |
rcu_read_lock(); |
f12c74cab blkcg: make blkg_... |
687 688 689 690 691 |
blkg_for_each_descendant_pre(pos_blkg, pos_css, blkg) { struct blkg_stat *stat; if (!pos_blkg->online) continue; |
16b3de665 blkcg: implement ... |
692 |
|
f12c74cab blkcg: make blkg_... |
693 694 695 696 697 698 |
if (pol) stat = (void *)blkg_to_pd(pos_blkg, pol) + off; else stat = (void *)blkg + off; sum += blkg_stat_read(stat) + atomic64_read(&stat->aux_cnt); |
16b3de665 blkcg: implement ... |
699 700 701 702 703 704 705 706 707 |
} rcu_read_unlock(); return sum; } EXPORT_SYMBOL_GPL(blkg_stat_recursive_sum); /** * blkg_rwstat_recursive_sum - collect hierarchical blkg_rwstat |
f12c74cab blkcg: make blkg_... |
708 709 710 |
* @blkg: blkg of interest * @pol: blkcg_policy which contains the blkg_rwstat * @off: offset to the blkg_rwstat in blkg_policy_data or @blkg |
16b3de665 blkcg: implement ... |
711 |
* |
f12c74cab blkcg: make blkg_... |
712 713 714 715 716 717 |
* Collect the blkg_rwstat specified by @blkg, @pol and @off and all its * online descendants and their aux counts. The caller must be holding the * queue lock for online tests. * * If @pol is NULL, blkg_rwstat is at @off bytes into @blkg; otherwise, it * is at @off bytes into @blkg's blkg_policy_data of the policy. |
16b3de665 blkcg: implement ... |
718 |
*/ |
f12c74cab blkcg: make blkg_... |
719 720 |
struct blkg_rwstat blkg_rwstat_recursive_sum(struct blkcg_gq *blkg, struct blkcg_policy *pol, int off) |
16b3de665 blkcg: implement ... |
721 |
{ |
16b3de665 blkcg: implement ... |
722 |
struct blkcg_gq *pos_blkg; |
492eb21b9 cgroup: make hier... |
723 |
struct cgroup_subsys_state *pos_css; |
bd8815a6d cgroup: make css_... |
724 |
struct blkg_rwstat sum = { }; |
16b3de665 blkcg: implement ... |
725 |
int i; |
f12c74cab blkcg: make blkg_... |
726 |
lockdep_assert_held(blkg->q->queue_lock); |
16b3de665 blkcg: implement ... |
727 |
|
16b3de665 blkcg: implement ... |
728 |
rcu_read_lock(); |
f12c74cab blkcg: make blkg_... |
729 |
blkg_for_each_descendant_pre(pos_blkg, pos_css, blkg) { |
3a7faeada blkcg: reduce sta... |
730 |
struct blkg_rwstat *rwstat; |
16b3de665 blkcg: implement ... |
731 732 733 |
if (!pos_blkg->online) continue; |
f12c74cab blkcg: make blkg_... |
734 735 736 737 |
if (pol) rwstat = (void *)blkg_to_pd(pos_blkg, pol) + off; else rwstat = (void *)pos_blkg + off; |
16b3de665 blkcg: implement ... |
738 |
for (i = 0; i < BLKG_RWSTAT_NR; i++) |
3a7faeada blkcg: reduce sta... |
739 740 741 |
atomic64_add(atomic64_read(&rwstat->aux_cnt[i]) + percpu_counter_sum_positive(&rwstat->cpu_cnt[i]), &sum.aux_cnt[i]); |
16b3de665 blkcg: implement ... |
742 743 744 745 746 747 |
} rcu_read_unlock(); return sum; } EXPORT_SYMBOL_GPL(blkg_rwstat_recursive_sum); |
457e490f2 blkcg: allocate s... |
748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 |
/* Performs queue bypass and policy enabled checks then looks up blkg. */ static struct blkcg_gq *blkg_lookup_check(struct blkcg *blkcg, const struct blkcg_policy *pol, struct request_queue *q) { WARN_ON_ONCE(!rcu_read_lock_held()); lockdep_assert_held(q->queue_lock); if (!blkcg_policy_enabled(q, pol)) return ERR_PTR(-EOPNOTSUPP); /* * This could be the first entry point of blkcg implementation and * we shouldn't allow anything to go through for a bypassing queue. */ if (unlikely(blk_queue_bypass(q))) return ERR_PTR(blk_queue_dying(q) ? -ENODEV : -EBUSY); return __blkg_lookup(blkcg, q, true /* update_hint */); } |
16b3de665 blkcg: implement ... |
768 |
/** |
3a8b31d39 blkcg: restructur... |
769 770 |
* blkg_conf_prep - parse and prepare for per-blkg config update * @blkcg: target block cgroup |
da8b06626 blkcg: make blkg_... |
771 |
* @pol: target policy |
3a8b31d39 blkcg: restructur... |
772 773 774 775 |
* @input: input string * @ctx: blkg_conf_ctx to be filled * * Parse per-blkg config update from @input and initialize @ctx with the |
36aa9e5f5 blkcg: move body ... |
776 777 778 |
* result. @ctx->blkg points to the blkg to be updated and @ctx->body the * part of @input following MAJ:MIN. This function returns with RCU read * lock and queue lock held and must be paired with blkg_conf_finish(). |
3a8b31d39 blkcg: restructur... |
779 |
*/ |
3c798398e blkcg: mass renam... |
780 |
int blkg_conf_prep(struct blkcg *blkcg, const struct blkcg_policy *pol, |
36aa9e5f5 blkcg: move body ... |
781 |
char *input, struct blkg_conf_ctx *ctx) |
da8b06626 blkcg: make blkg_... |
782 |
__acquires(rcu) __acquires(disk->queue->queue_lock) |
34d0f179d io-controller: Ad... |
783 |
{ |
3a8b31d39 blkcg: restructur... |
784 |
struct gendisk *disk; |
457e490f2 blkcg: allocate s... |
785 |
struct request_queue *q; |
3c798398e blkcg: mass renam... |
786 |
struct blkcg_gq *blkg; |
39a169b62 block: fix module... |
787 |
struct module *owner; |
726fa6945 blkcg: simplify b... |
788 |
unsigned int major, minor; |
36aa9e5f5 blkcg: move body ... |
789 790 |
int key_len, part, ret; char *body; |
34d0f179d io-controller: Ad... |
791 |
|
36aa9e5f5 blkcg: move body ... |
792 |
if (sscanf(input, "%u:%u%n", &major, &minor, &key_len) != 2) |
726fa6945 blkcg: simplify b... |
793 |
return -EINVAL; |
3a8b31d39 blkcg: restructur... |
794 |
|
36aa9e5f5 blkcg: move body ... |
795 796 797 798 |
body = input + key_len; if (!isspace(*body)) return -EINVAL; body = skip_spaces(body); |
726fa6945 blkcg: simplify b... |
799 |
disk = get_gendisk(MKDEV(major, minor), &part); |
5f6c2d2b7 blkcg: fix gendis... |
800 |
if (!disk) |
20386ce01 blkcg: refine err... |
801 |
return -ENODEV; |
5f6c2d2b7 blkcg: fix gendis... |
802 |
if (part) { |
457e490f2 blkcg: allocate s... |
803 804 |
ret = -ENODEV; goto fail; |
5f6c2d2b7 blkcg: fix gendis... |
805 |
} |
e56da7e28 blkcg: don't allo... |
806 |
|
457e490f2 blkcg: allocate s... |
807 |
q = disk->queue; |
da8b06626 blkcg: make blkg_... |
808 |
|
457e490f2 blkcg: allocate s... |
809 810 |
rcu_read_lock(); spin_lock_irq(q->queue_lock); |
e56da7e28 blkcg: don't allo... |
811 |
|
457e490f2 blkcg: allocate s... |
812 |
blkg = blkg_lookup_check(blkcg, pol, q); |
4bfd482e7 blkcg: kill blkio... |
813 814 |
if (IS_ERR(blkg)) { ret = PTR_ERR(blkg); |
457e490f2 blkcg: allocate s... |
815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 |
goto fail_unlock; } if (blkg) goto success; /* * Create blkgs walking down from blkcg_root to @blkcg, so that all * non-root blkgs have access to their parents. */ while (true) { struct blkcg *pos = blkcg; struct blkcg *parent; struct blkcg_gq *new_blkg; parent = blkcg_parent(blkcg); while (parent && !__blkg_lookup(parent, q, false)) { pos = parent; parent = blkcg_parent(parent); } /* Drop locks to do new blkg allocation with GFP_KERNEL. */ spin_unlock_irq(q->queue_lock); |
3a8b31d39 blkcg: restructur... |
838 |
rcu_read_unlock(); |
457e490f2 blkcg: allocate s... |
839 840 841 842 843 |
new_blkg = blkg_alloc(pos, q, GFP_KERNEL); if (unlikely(!new_blkg)) { ret = -ENOMEM; goto fail; |
7702e8f45 blk-cgroup: cgrou... |
844 |
} |
3a8b31d39 blkcg: restructur... |
845 |
|
457e490f2 blkcg: allocate s... |
846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 |
rcu_read_lock(); spin_lock_irq(q->queue_lock); blkg = blkg_lookup_check(pos, pol, q); if (IS_ERR(blkg)) { ret = PTR_ERR(blkg); goto fail_unlock; } if (blkg) { blkg_free(new_blkg); } else { blkg = blkg_create(pos, q, new_blkg); if (unlikely(IS_ERR(blkg))) { ret = PTR_ERR(blkg); goto fail_unlock; } } if (pos == blkcg) goto success; } success: |
3a8b31d39 blkcg: restructur... |
869 870 |
ctx->disk = disk; ctx->blkg = blkg; |
36aa9e5f5 blkcg: move body ... |
871 |
ctx->body = body; |
726fa6945 blkcg: simplify b... |
872 |
return 0; |
457e490f2 blkcg: allocate s... |
873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 |
fail_unlock: spin_unlock_irq(q->queue_lock); rcu_read_unlock(); fail: owner = disk->fops->owner; put_disk(disk); module_put(owner); /* * If queue was bypassing, we should retry. Do so after a * short msleep(). It isn't strictly necessary but queue * can be bypassing for some time and it's always nice to * avoid busy looping. */ if (ret == -EBUSY) { msleep(10); ret = restart_syscall(); } return ret; |
34d0f179d io-controller: Ad... |
892 |
} |
829fdb500 blkcg: export con... |
893 |
EXPORT_SYMBOL_GPL(blkg_conf_prep); |
34d0f179d io-controller: Ad... |
894 |
|
3a8b31d39 blkcg: restructur... |
895 896 897 898 899 900 901 |
/** * blkg_conf_finish - finish up per-blkg config update * @ctx: blkg_conf_ctx intiailized by blkg_conf_prep() * * Finish up after per-blkg config update. This function must be paired * with blkg_conf_prep(). */ |
829fdb500 blkcg: export con... |
902 |
void blkg_conf_finish(struct blkg_conf_ctx *ctx) |
da8b06626 blkcg: make blkg_... |
903 |
__releases(ctx->disk->queue->queue_lock) __releases(rcu) |
34d0f179d io-controller: Ad... |
904 |
{ |
39a169b62 block: fix module... |
905 |
struct module *owner; |
da8b06626 blkcg: make blkg_... |
906 |
spin_unlock_irq(ctx->disk->queue->queue_lock); |
3a8b31d39 blkcg: restructur... |
907 |
rcu_read_unlock(); |
39a169b62 block: fix module... |
908 |
owner = ctx->disk->fops->owner; |
3a8b31d39 blkcg: restructur... |
909 |
put_disk(ctx->disk); |
39a169b62 block: fix module... |
910 |
module_put(owner); |
34d0f179d io-controller: Ad... |
911 |
} |
829fdb500 blkcg: export con... |
912 |
EXPORT_SYMBOL_GPL(blkg_conf_finish); |
34d0f179d io-controller: Ad... |
913 |
|
2ee867dcf blkcg: implement ... |
914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 |
static int blkcg_print_stat(struct seq_file *sf, void *v) { struct blkcg *blkcg = css_to_blkcg(seq_css(sf)); struct blkcg_gq *blkg; rcu_read_lock(); hlist_for_each_entry_rcu(blkg, &blkcg->blkg_list, blkcg_node) { const char *dname; struct blkg_rwstat rwstat; u64 rbytes, wbytes, rios, wios; dname = blkg_dev_name(blkg); if (!dname) continue; spin_lock_irq(blkg->q->queue_lock); rwstat = blkg_rwstat_recursive_sum(blkg, NULL, offsetof(struct blkcg_gq, stat_bytes)); rbytes = atomic64_read(&rwstat.aux_cnt[BLKG_RWSTAT_READ]); wbytes = atomic64_read(&rwstat.aux_cnt[BLKG_RWSTAT_WRITE]); rwstat = blkg_rwstat_recursive_sum(blkg, NULL, offsetof(struct blkcg_gq, stat_ios)); rios = atomic64_read(&rwstat.aux_cnt[BLKG_RWSTAT_READ]); wios = atomic64_read(&rwstat.aux_cnt[BLKG_RWSTAT_WRITE]); spin_unlock_irq(blkg->q->queue_lock); if (rbytes || wbytes || rios || wios) seq_printf(sf, "%s rbytes=%llu wbytes=%llu rios=%llu wios=%llu ", dname, rbytes, wbytes, rios, wios); } rcu_read_unlock(); return 0; } |
e1f3b9412 block/blk-cgroup.... |
953 |
static struct cftype blkcg_files[] = { |
2ee867dcf blkcg: implement ... |
954 955 |
{ .name = "stat", |
ca0752c5e blkcg: don't crea... |
956 |
.flags = CFTYPE_NOT_ON_ROOT, |
2ee867dcf blkcg: implement ... |
957 958 959 960 |
.seq_show = blkcg_print_stat, }, { } /* terminate */ }; |
e1f3b9412 block/blk-cgroup.... |
961 |
static struct cftype blkcg_legacy_files[] = { |
31e4c28d9 blkio: Introduce ... |
962 |
{ |
84c124da9 blkio: Changes to... |
963 |
.name = "reset_stats", |
3c798398e blkcg: mass renam... |
964 |
.write_u64 = blkcg_reset_stats, |
220841906 blkio: Export dis... |
965 |
}, |
4baf6e332 cgroup: convert a... |
966 |
{ } /* terminate */ |
31e4c28d9 blkio: Introduce ... |
967 |
}; |
9f13ef678 blkcg: use double... |
968 |
/** |
92fb97487 cgroup: rename ->... |
969 |
* blkcg_css_offline - cgroup css_offline callback |
eb95419b0 cgroup: pass arou... |
970 |
* @css: css of interest |
9f13ef678 blkcg: use double... |
971 |
* |
eb95419b0 cgroup: pass arou... |
972 973 |
* This function is called when @css is about to go away and responsible * for shooting down all blkgs associated with @css. blkgs should be |
9f13ef678 blkcg: use double... |
974 975 976 977 978 |
* removed while holding both q and blkcg locks. As blkcg lock is nested * inside q lock, this function performs reverse double lock dancing. * * This is the blkcg counterpart of ioc_release_fn(). */ |
eb95419b0 cgroup: pass arou... |
979 |
static void blkcg_css_offline(struct cgroup_subsys_state *css) |
31e4c28d9 blkio: Introduce ... |
980 |
{ |
eb95419b0 cgroup: pass arou... |
981 |
struct blkcg *blkcg = css_to_blkcg(css); |
b1c357696 blkio: Take care ... |
982 |
|
9f13ef678 blkcg: use double... |
983 |
spin_lock_irq(&blkcg->lock); |
7ee9c5620 blkcg: let blkio_... |
984 |
|
9f13ef678 blkcg: use double... |
985 |
while (!hlist_empty(&blkcg->blkg_list)) { |
3c798398e blkcg: mass renam... |
986 987 |
struct blkcg_gq *blkg = hlist_entry(blkcg->blkg_list.first, struct blkcg_gq, blkcg_node); |
c875f4d02 blkcg: drop unnec... |
988 |
struct request_queue *q = blkg->q; |
b1c357696 blkio: Take care ... |
989 |
|
9f13ef678 blkcg: use double... |
990 991 992 993 994 |
if (spin_trylock(q->queue_lock)) { blkg_destroy(blkg); spin_unlock(q->queue_lock); } else { spin_unlock_irq(&blkcg->lock); |
9f13ef678 blkcg: use double... |
995 |
cpu_relax(); |
a5567932f blkcg: change a s... |
996 |
spin_lock_irq(&blkcg->lock); |
0f3942a39 block: kill some ... |
997 |
} |
9f13ef678 blkcg: use double... |
998 |
} |
b1c357696 blkio: Take care ... |
999 |
|
9f13ef678 blkcg: use double... |
1000 |
spin_unlock_irq(&blkcg->lock); |
52ebea749 writeback: make b... |
1001 1002 |
wb_blkcg_offline(blkcg); |
7ee9c5620 blkcg: let blkio_... |
1003 |
} |
eb95419b0 cgroup: pass arou... |
1004 |
static void blkcg_css_free(struct cgroup_subsys_state *css) |
7ee9c5620 blkcg: let blkio_... |
1005 |
{ |
eb95419b0 cgroup: pass arou... |
1006 |
struct blkcg *blkcg = css_to_blkcg(css); |
bc915e61c blkcg: remove unn... |
1007 |
int i; |
7ee9c5620 blkcg: let blkio_... |
1008 |
|
7876f930d blkcg: implement ... |
1009 |
mutex_lock(&blkcg_pol_mutex); |
e4a9bde95 blkcg: replace bl... |
1010 |
|
7876f930d blkcg: implement ... |
1011 |
list_del(&blkcg->all_blkcgs_node); |
7876f930d blkcg: implement ... |
1012 |
|
bc915e61c blkcg: remove unn... |
1013 |
for (i = 0; i < BLKCG_MAX_POLS; i++) |
e4a9bde95 blkcg: replace bl... |
1014 1015 1016 1017 |
if (blkcg->cpd[i]) blkcg_policy[i]->cpd_free_fn(blkcg->cpd[i]); mutex_unlock(&blkcg_pol_mutex); |
bc915e61c blkcg: remove unn... |
1018 |
kfree(blkcg); |
31e4c28d9 blkio: Introduce ... |
1019 |
} |
eb95419b0 cgroup: pass arou... |
1020 1021 |
static struct cgroup_subsys_state * blkcg_css_alloc(struct cgroup_subsys_state *parent_css) |
31e4c28d9 blkio: Introduce ... |
1022 |
{ |
3c798398e blkcg: mass renam... |
1023 |
struct blkcg *blkcg; |
e48453c38 block, cgroup: im... |
1024 1025 |
struct cgroup_subsys_state *ret; int i; |
31e4c28d9 blkio: Introduce ... |
1026 |
|
7876f930d blkcg: implement ... |
1027 |
mutex_lock(&blkcg_pol_mutex); |
eb95419b0 cgroup: pass arou... |
1028 |
if (!parent_css) { |
3c798398e blkcg: mass renam... |
1029 |
blkcg = &blkcg_root; |
bc915e61c blkcg: remove unn... |
1030 1031 1032 1033 |
} else { blkcg = kzalloc(sizeof(*blkcg), GFP_KERNEL); if (!blkcg) { ret = ERR_PTR(-ENOMEM); |
4c18c9e96 blkcg: avoid free... |
1034 |
goto unlock; |
bc915e61c blkcg: remove unn... |
1035 |
} |
e48453c38 block, cgroup: im... |
1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 |
} for (i = 0; i < BLKCG_MAX_POLS ; i++) { struct blkcg_policy *pol = blkcg_policy[i]; struct blkcg_policy_data *cpd; /* * If the policy hasn't been attached yet, wait for it * to be attached before doing anything else. Otherwise, * check if the policy requires any specific per-cgroup * data: if it does, allocate and initialize it. */ |
e4a9bde95 blkcg: replace bl... |
1048 |
if (!pol || !pol->cpd_alloc_fn) |
e48453c38 block, cgroup: im... |
1049 |
continue; |
e4a9bde95 blkcg: replace bl... |
1050 |
cpd = pol->cpd_alloc_fn(GFP_KERNEL); |
e48453c38 block, cgroup: im... |
1051 1052 1053 1054 |
if (!cpd) { ret = ERR_PTR(-ENOMEM); goto free_pd_blkcg; } |
814376483 blkcg: minor upda... |
1055 1056 |
blkcg->cpd[i] = cpd; cpd->blkcg = blkcg; |
e48453c38 block, cgroup: im... |
1057 |
cpd->plid = i; |
e4a9bde95 blkcg: replace bl... |
1058 1059 |
if (pol->cpd_init_fn) pol->cpd_init_fn(cpd); |
e48453c38 block, cgroup: im... |
1060 |
} |
31e4c28d9 blkio: Introduce ... |
1061 |
|
31e4c28d9 blkio: Introduce ... |
1062 |
spin_lock_init(&blkcg->lock); |
e00f4f4d0 block,blkcg: use ... |
1063 |
INIT_RADIX_TREE(&blkcg->blkg_tree, GFP_NOWAIT | __GFP_NOWARN); |
31e4c28d9 blkio: Introduce ... |
1064 |
INIT_HLIST_HEAD(&blkcg->blkg_list); |
52ebea749 writeback: make b... |
1065 1066 1067 |
#ifdef CONFIG_CGROUP_WRITEBACK INIT_LIST_HEAD(&blkcg->cgwb_list); #endif |
7876f930d blkcg: implement ... |
1068 1069 1070 |
list_add_tail(&blkcg->all_blkcgs_node, &all_blkcgs); mutex_unlock(&blkcg_pol_mutex); |
31e4c28d9 blkio: Introduce ... |
1071 |
return &blkcg->css; |
e48453c38 block, cgroup: im... |
1072 1073 1074 |
free_pd_blkcg: for (i--; i >= 0; i--) |
e4a9bde95 blkcg: replace bl... |
1075 1076 |
if (blkcg->cpd[i]) blkcg_policy[i]->cpd_free_fn(blkcg->cpd[i]); |
4c18c9e96 blkcg: avoid free... |
1077 1078 1079 1080 |
if (blkcg != &blkcg_root) kfree(blkcg); unlock: |
7876f930d blkcg: implement ... |
1081 |
mutex_unlock(&blkcg_pol_mutex); |
e48453c38 block, cgroup: im... |
1082 |
return ret; |
31e4c28d9 blkio: Introduce ... |
1083 |
} |
5efd61135 blkcg: add blkcg_... |
1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 |
/** * blkcg_init_queue - initialize blkcg part of request queue * @q: request_queue to initialize * * Called from blk_alloc_queue_node(). Responsible for initializing blkcg * part of new request_queue @q. * * RETURNS: * 0 on success, -errno on failure. */ int blkcg_init_queue(struct request_queue *q) { |
d708f0d50 Revert "blkcg: al... |
1096 1097 |
struct blkcg_gq *new_blkg, *blkg; bool preloaded; |
ec13b1d6f blkcg: always cre... |
1098 |
int ret; |
d708f0d50 Revert "blkcg: al... |
1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 |
new_blkg = blkg_alloc(&blkcg_root, q, GFP_KERNEL); if (!new_blkg) return -ENOMEM; preloaded = !radix_tree_preload(GFP_KERNEL); /* * Make sure the root blkg exists and count the existing blkgs. As * @q is bypassing at this point, blkg_lookup_create() can't be * used. Open code insertion. */ |
ec13b1d6f blkcg: always cre... |
1110 1111 |
rcu_read_lock(); spin_lock_irq(q->queue_lock); |
d708f0d50 Revert "blkcg: al... |
1112 |
blkg = blkg_create(&blkcg_root, q, new_blkg); |
ea7246c25 blkcg: init root ... |
1113 1114 1115 1116 |
if (IS_ERR(blkg)) goto err_unlock; q->root_blkg = blkg; q->root_rl.blkg = blkg; |
ec13b1d6f blkcg: always cre... |
1117 1118 |
spin_unlock_irq(q->queue_lock); rcu_read_unlock(); |
d708f0d50 Revert "blkcg: al... |
1119 1120 |
if (preloaded) radix_tree_preload_end(); |
ec13b1d6f blkcg: always cre... |
1121 1122 1123 1124 1125 1126 1127 |
ret = blk_throtl_init(q); if (ret) { spin_lock_irq(q->queue_lock); blkg_destroy_all(q); spin_unlock_irq(q->queue_lock); } return ret; |
ea7246c25 blkcg: init root ... |
1128 1129 1130 1131 1132 1133 1134 |
err_unlock: spin_unlock_irq(q->queue_lock); rcu_read_unlock(); if (preloaded) radix_tree_preload_end(); return PTR_ERR(blkg); |
5efd61135 blkcg: add blkcg_... |
1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 |
} /** * blkcg_drain_queue - drain blkcg part of request_queue * @q: request_queue to drain * * Called from blk_drain_queue(). Responsible for draining blkcg part. */ void blkcg_drain_queue(struct request_queue *q) { lockdep_assert_held(q->queue_lock); |
0b462c89e blkcg: don't call... |
1146 1147 1148 1149 1150 1151 |
/* * @q could be exiting and already have destroyed all blkgs as * indicated by NULL root_blkg. If so, don't confuse policies. */ if (!q->root_blkg) return; |
5efd61135 blkcg: add blkcg_... |
1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 |
blk_throtl_drain(q); } /** * blkcg_exit_queue - exit and release blkcg part of request_queue * @q: request_queue being released * * Called from blk_release_queue(). Responsible for exiting blkcg part. */ void blkcg_exit_queue(struct request_queue *q) { |
6d18b008d blkcg: shoot down... |
1163 |
spin_lock_irq(q->queue_lock); |
3c96cb32d blkcg: drop stuff... |
1164 |
blkg_destroy_all(q); |
6d18b008d blkcg: shoot down... |
1165 |
spin_unlock_irq(q->queue_lock); |
5efd61135 blkcg: add blkcg_... |
1166 1167 |
blk_throtl_exit(q); } |
31e4c28d9 blkio: Introduce ... |
1168 1169 1170 1171 1172 1173 |
/* * We cannot support shared io contexts, as we have no mean to support * two tasks with the same ioc in two different groups without major rework * 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. */ |
1f7dd3e5a cgroup: fix handl... |
1174 |
static int blkcg_can_attach(struct cgroup_taskset *tset) |
31e4c28d9 blkio: Introduce ... |
1175 |
{ |
bb9d97b6d cgroup: don't use... |
1176 |
struct task_struct *task; |
1f7dd3e5a cgroup: fix handl... |
1177 |
struct cgroup_subsys_state *dst_css; |
31e4c28d9 blkio: Introduce ... |
1178 1179 1180 1181 |
struct io_context *ioc; int ret = 0; /* task_lock() is needed to avoid races with exit_io_context() */ |
1f7dd3e5a cgroup: fix handl... |
1182 |
cgroup_taskset_for_each(task, dst_css, tset) { |
bb9d97b6d cgroup: don't use... |
1183 1184 1185 1186 1187 1188 1189 1190 |
task_lock(task); ioc = task->io_context; if (ioc && atomic_read(&ioc->nr_tasks) > 1) ret = -EINVAL; task_unlock(task); if (ret) break; } |
31e4c28d9 blkio: Introduce ... |
1191 1192 |
return ret; } |
69d7fde59 blkcg: use CGROUP... |
1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 |
static void blkcg_bind(struct cgroup_subsys_state *root_css) { int i; mutex_lock(&blkcg_pol_mutex); for (i = 0; i < BLKCG_MAX_POLS; i++) { struct blkcg_policy *pol = blkcg_policy[i]; struct blkcg *blkcg; if (!pol || !pol->cpd_bind_fn) continue; list_for_each_entry(blkcg, &all_blkcgs, all_blkcgs_node) if (blkcg->cpd[pol->plid]) pol->cpd_bind_fn(blkcg->cpd[pol->plid]); } mutex_unlock(&blkcg_pol_mutex); } |
c165b3e3c blkcg: rename sub... |
1212 |
struct cgroup_subsys io_cgrp_subsys = { |
92fb97487 cgroup: rename ->... |
1213 1214 1215 |
.css_alloc = blkcg_css_alloc, .css_offline = blkcg_css_offline, .css_free = blkcg_css_free, |
3c798398e blkcg: mass renam... |
1216 |
.can_attach = blkcg_can_attach, |
69d7fde59 blkcg: use CGROUP... |
1217 |
.bind = blkcg_bind, |
2ee867dcf blkcg: implement ... |
1218 |
.dfl_cftypes = blkcg_files, |
880f50e22 blkcg: mark exist... |
1219 |
.legacy_cftypes = blkcg_legacy_files, |
c165b3e3c blkcg: rename sub... |
1220 |
.legacy_name = "blkio", |
1ced953b1 blkcg, memcg: mak... |
1221 1222 1223 1224 1225 1226 1227 1228 |
#ifdef CONFIG_MEMCG /* * This ensures that, if available, memcg is automatically enabled * together on the default hierarchy so that the owner cgroup can * be retrieved from writeback pages. */ .depends_on = 1 << memory_cgrp_id, #endif |
676f7c8f8 cgroup: relocate ... |
1229 |
}; |
c165b3e3c blkcg: rename sub... |
1230 |
EXPORT_SYMBOL_GPL(io_cgrp_subsys); |
676f7c8f8 cgroup: relocate ... |
1231 |
|
8bd435b30 blkcg: remove sta... |
1232 |
/** |
a2b1693ba blkcg: implement ... |
1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 |
* blkcg_activate_policy - activate a blkcg policy on a request_queue * @q: request_queue of interest * @pol: blkcg policy to activate * * Activate @pol on @q. Requires %GFP_KERNEL context. @q goes through * bypass mode to populate its blkgs with policy_data for @pol. * * Activation happens with @q bypassed, so nobody would be accessing blkgs * from IO path. Update of each blkg is protected by both queue and blkcg * locks so that holding either lock and testing blkcg_policy_enabled() is * always enough for dereferencing policy data. * * The caller is responsible for synchronizing [de]activations and policy * [un]registerations. Returns 0 on success, -errno on failure. */ int blkcg_activate_policy(struct request_queue *q, |
3c798398e blkcg: mass renam... |
1249 |
const struct blkcg_policy *pol) |
a2b1693ba blkcg: implement ... |
1250 |
{ |
4c55f4f9a blkcg: restructur... |
1251 |
struct blkg_policy_data *pd_prealloc = NULL; |
ec13b1d6f blkcg: always cre... |
1252 |
struct blkcg_gq *blkg; |
4c55f4f9a blkcg: restructur... |
1253 |
int ret; |
a2b1693ba blkcg: implement ... |
1254 1255 1256 |
if (blkcg_policy_enabled(q, pol)) return 0; |
38dbb7dd4 blk-cgroup: don't... |
1257 |
if (q->mq_ops) |
bd166ef18 blk-mq-sched: add... |
1258 |
blk_mq_freeze_queue(q); |
38dbb7dd4 blk-cgroup: don't... |
1259 |
else |
bd166ef18 blk-mq-sched: add... |
1260 |
blk_queue_bypass_start(q); |
4c55f4f9a blkcg: restructur... |
1261 1262 |
pd_prealloc: if (!pd_prealloc) { |
001bea73e blkcg: replace bl... |
1263 |
pd_prealloc = pol->pd_alloc_fn(GFP_KERNEL, q->node); |
4c55f4f9a blkcg: restructur... |
1264 |
if (!pd_prealloc) { |
a2b1693ba blkcg: implement ... |
1265 |
ret = -ENOMEM; |
4c55f4f9a blkcg: restructur... |
1266 |
goto out_bypass_end; |
a2b1693ba blkcg: implement ... |
1267 |
} |
a2b1693ba blkcg: implement ... |
1268 |
} |
a2b1693ba blkcg: implement ... |
1269 1270 1271 |
spin_lock_irq(q->queue_lock); list_for_each_entry(blkg, &q->blkg_list, q_node) { |
4c55f4f9a blkcg: restructur... |
1272 1273 1274 1275 |
struct blkg_policy_data *pd; if (blkg->pd[pol->plid]) continue; |
a2b1693ba blkcg: implement ... |
1276 |
|
e00f4f4d0 block,blkcg: use ... |
1277 |
pd = pol->pd_alloc_fn(GFP_NOWAIT | __GFP_NOWARN, q->node); |
4c55f4f9a blkcg: restructur... |
1278 1279 1280 1281 1282 1283 |
if (!pd) swap(pd, pd_prealloc); if (!pd) { spin_unlock_irq(q->queue_lock); goto pd_prealloc; } |
a2b1693ba blkcg: implement ... |
1284 1285 1286 |
blkg->pd[pol->plid] = pd; pd->blkg = blkg; |
b276a876a blkcg: add blkg_p... |
1287 |
pd->plid = pol->plid; |
3e4187104 blkcg: make blkcg... |
1288 |
if (pol->pd_init_fn) |
a9520cd6f blkcg: make blkcg... |
1289 |
pol->pd_init_fn(pd); |
a2b1693ba blkcg: implement ... |
1290 1291 1292 1293 |
} __set_bit(pol->plid, q->blkcg_pols); ret = 0; |
4c55f4f9a blkcg: restructur... |
1294 |
|
a2b1693ba blkcg: implement ... |
1295 |
spin_unlock_irq(q->queue_lock); |
4c55f4f9a blkcg: restructur... |
1296 |
out_bypass_end: |
38dbb7dd4 blk-cgroup: don't... |
1297 |
if (q->mq_ops) |
bd166ef18 blk-mq-sched: add... |
1298 |
blk_mq_unfreeze_queue(q); |
38dbb7dd4 blk-cgroup: don't... |
1299 |
else |
bd166ef18 blk-mq-sched: add... |
1300 |
blk_queue_bypass_end(q); |
001bea73e blkcg: replace bl... |
1301 1302 |
if (pd_prealloc) pol->pd_free_fn(pd_prealloc); |
a2b1693ba blkcg: implement ... |
1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 |
return ret; } EXPORT_SYMBOL_GPL(blkcg_activate_policy); /** * blkcg_deactivate_policy - deactivate a blkcg policy on a request_queue * @q: request_queue of interest * @pol: blkcg policy to deactivate * * Deactivate @pol on @q. Follows the same synchronization rules as * blkcg_activate_policy(). */ void blkcg_deactivate_policy(struct request_queue *q, |
3c798398e blkcg: mass renam... |
1316 |
const struct blkcg_policy *pol) |
a2b1693ba blkcg: implement ... |
1317 |
{ |
3c798398e blkcg: mass renam... |
1318 |
struct blkcg_gq *blkg; |
a2b1693ba blkcg: implement ... |
1319 1320 1321 |
if (!blkcg_policy_enabled(q, pol)) return; |
38dbb7dd4 blk-cgroup: don't... |
1322 |
if (q->mq_ops) |
bd166ef18 blk-mq-sched: add... |
1323 |
blk_mq_freeze_queue(q); |
38dbb7dd4 blk-cgroup: don't... |
1324 |
else |
bd166ef18 blk-mq-sched: add... |
1325 |
blk_queue_bypass_start(q); |
a2b1693ba blkcg: implement ... |
1326 1327 1328 1329 1330 |
spin_lock_irq(q->queue_lock); __clear_bit(pol->plid, q->blkcg_pols); list_for_each_entry(blkg, &q->blkg_list, q_node) { |
001bea73e blkcg: replace bl... |
1331 |
if (blkg->pd[pol->plid]) { |
a9520cd6f blkcg: make blkcg... |
1332 1333 |
if (pol->pd_offline_fn) pol->pd_offline_fn(blkg->pd[pol->plid]); |
001bea73e blkcg: replace bl... |
1334 1335 1336 |
pol->pd_free_fn(blkg->pd[pol->plid]); blkg->pd[pol->plid] = NULL; } |
a2b1693ba blkcg: implement ... |
1337 1338 1339 |
} spin_unlock_irq(q->queue_lock); |
bd166ef18 blk-mq-sched: add... |
1340 |
|
38dbb7dd4 blk-cgroup: don't... |
1341 |
if (q->mq_ops) |
bd166ef18 blk-mq-sched: add... |
1342 |
blk_mq_unfreeze_queue(q); |
38dbb7dd4 blk-cgroup: don't... |
1343 |
else |
bd166ef18 blk-mq-sched: add... |
1344 |
blk_queue_bypass_end(q); |
a2b1693ba blkcg: implement ... |
1345 1346 1347 1348 |
} EXPORT_SYMBOL_GPL(blkcg_deactivate_policy); /** |
3c798398e blkcg: mass renam... |
1349 1350 |
* blkcg_policy_register - register a blkcg policy * @pol: blkcg policy to register |
8bd435b30 blkcg: remove sta... |
1351 |
* |
3c798398e blkcg: mass renam... |
1352 1353 |
* Register @pol with blkcg core. Might sleep and @pol may be modified on * successful registration. Returns 0 on success and -errno on failure. |
8bd435b30 blkcg: remove sta... |
1354 |
*/ |
d5bf02914 Revert "block: ad... |
1355 |
int blkcg_policy_register(struct blkcg_policy *pol) |
3e2520668 blkio: Implement ... |
1356 |
{ |
06b285bd1 blkcg: fix blkcg_... |
1357 |
struct blkcg *blkcg; |
8bd435b30 blkcg: remove sta... |
1358 |
int i, ret; |
e8989fae3 blkcg: unify blkg... |
1359 |
|
838f13bf4 blkcg: allow blkc... |
1360 |
mutex_lock(&blkcg_pol_register_mutex); |
bc0d6501a blkcg: kill blkio... |
1361 |
mutex_lock(&blkcg_pol_mutex); |
8bd435b30 blkcg: remove sta... |
1362 1363 1364 |
/* find an empty slot */ ret = -ENOSPC; for (i = 0; i < BLKCG_MAX_POLS; i++) |
3c798398e blkcg: mass renam... |
1365 |
if (!blkcg_policy[i]) |
8bd435b30 blkcg: remove sta... |
1366 1367 |
break; if (i >= BLKCG_MAX_POLS) |
838f13bf4 blkcg: allow blkc... |
1368 |
goto err_unlock; |
035d10b2f blkcg: add blkio_... |
1369 |
|
06b285bd1 blkcg: fix blkcg_... |
1370 |
/* register @pol */ |
3c798398e blkcg: mass renam... |
1371 |
pol->plid = i; |
06b285bd1 blkcg: fix blkcg_... |
1372 1373 1374 |
blkcg_policy[pol->plid] = pol; /* allocate and install cpd's */ |
e4a9bde95 blkcg: replace bl... |
1375 |
if (pol->cpd_alloc_fn) { |
06b285bd1 blkcg: fix blkcg_... |
1376 1377 |
list_for_each_entry(blkcg, &all_blkcgs, all_blkcgs_node) { struct blkcg_policy_data *cpd; |
e4a9bde95 blkcg: replace bl... |
1378 |
cpd = pol->cpd_alloc_fn(GFP_KERNEL); |
bbb427e34 blkcg: Unlock blk... |
1379 |
if (!cpd) |
06b285bd1 blkcg: fix blkcg_... |
1380 |
goto err_free_cpds; |
06b285bd1 blkcg: fix blkcg_... |
1381 |
|
814376483 blkcg: minor upda... |
1382 1383 |
blkcg->cpd[pol->plid] = cpd; cpd->blkcg = blkcg; |
06b285bd1 blkcg: fix blkcg_... |
1384 |
cpd->plid = pol->plid; |
814376483 blkcg: minor upda... |
1385 |
pol->cpd_init_fn(cpd); |
06b285bd1 blkcg: fix blkcg_... |
1386 1387 |
} } |
838f13bf4 blkcg: allow blkc... |
1388 |
mutex_unlock(&blkcg_pol_mutex); |
8bd435b30 blkcg: remove sta... |
1389 |
|
8bd435b30 blkcg: remove sta... |
1390 |
/* everything is in place, add intf files for the new policy */ |
2ee867dcf blkcg: implement ... |
1391 1392 1393 |
if (pol->dfl_cftypes) WARN_ON(cgroup_add_dfl_cftypes(&io_cgrp_subsys, pol->dfl_cftypes)); |
880f50e22 blkcg: mark exist... |
1394 |
if (pol->legacy_cftypes) |
c165b3e3c blkcg: rename sub... |
1395 |
WARN_ON(cgroup_add_legacy_cftypes(&io_cgrp_subsys, |
880f50e22 blkcg: mark exist... |
1396 |
pol->legacy_cftypes)); |
838f13bf4 blkcg: allow blkc... |
1397 1398 |
mutex_unlock(&blkcg_pol_register_mutex); return 0; |
06b285bd1 blkcg: fix blkcg_... |
1399 |
err_free_cpds: |
e4a9bde95 blkcg: replace bl... |
1400 |
if (pol->cpd_alloc_fn) { |
06b285bd1 blkcg: fix blkcg_... |
1401 |
list_for_each_entry(blkcg, &all_blkcgs, all_blkcgs_node) { |
e4a9bde95 blkcg: replace bl... |
1402 1403 1404 1405 |
if (blkcg->cpd[pol->plid]) { pol->cpd_free_fn(blkcg->cpd[pol->plid]); blkcg->cpd[pol->plid] = NULL; } |
06b285bd1 blkcg: fix blkcg_... |
1406 1407 1408 |
} } blkcg_policy[pol->plid] = NULL; |
838f13bf4 blkcg: allow blkc... |
1409 |
err_unlock: |
bc0d6501a blkcg: kill blkio... |
1410 |
mutex_unlock(&blkcg_pol_mutex); |
838f13bf4 blkcg: allow blkc... |
1411 |
mutex_unlock(&blkcg_pol_register_mutex); |
8bd435b30 blkcg: remove sta... |
1412 |
return ret; |
3e2520668 blkio: Implement ... |
1413 |
} |
3c798398e blkcg: mass renam... |
1414 |
EXPORT_SYMBOL_GPL(blkcg_policy_register); |
3e2520668 blkio: Implement ... |
1415 |
|
8bd435b30 blkcg: remove sta... |
1416 |
/** |
3c798398e blkcg: mass renam... |
1417 1418 |
* blkcg_policy_unregister - unregister a blkcg policy * @pol: blkcg policy to unregister |
8bd435b30 blkcg: remove sta... |
1419 |
* |
3c798398e blkcg: mass renam... |
1420 |
* Undo blkcg_policy_register(@pol). Might sleep. |
8bd435b30 blkcg: remove sta... |
1421 |
*/ |
3c798398e blkcg: mass renam... |
1422 |
void blkcg_policy_unregister(struct blkcg_policy *pol) |
3e2520668 blkio: Implement ... |
1423 |
{ |
06b285bd1 blkcg: fix blkcg_... |
1424 |
struct blkcg *blkcg; |
838f13bf4 blkcg: allow blkc... |
1425 |
mutex_lock(&blkcg_pol_register_mutex); |
bc0d6501a blkcg: kill blkio... |
1426 |
|
3c798398e blkcg: mass renam... |
1427 |
if (WARN_ON(blkcg_policy[pol->plid] != pol)) |
8bd435b30 blkcg: remove sta... |
1428 1429 1430 |
goto out_unlock; /* kill the intf files first */ |
2ee867dcf blkcg: implement ... |
1431 1432 |
if (pol->dfl_cftypes) cgroup_rm_cftypes(pol->dfl_cftypes); |
880f50e22 blkcg: mark exist... |
1433 1434 |
if (pol->legacy_cftypes) cgroup_rm_cftypes(pol->legacy_cftypes); |
44ea53de4 blkcg: implement ... |
1435 |
|
06b285bd1 blkcg: fix blkcg_... |
1436 |
/* remove cpds and unregister */ |
838f13bf4 blkcg: allow blkc... |
1437 |
mutex_lock(&blkcg_pol_mutex); |
06b285bd1 blkcg: fix blkcg_... |
1438 |
|
e4a9bde95 blkcg: replace bl... |
1439 |
if (pol->cpd_alloc_fn) { |
06b285bd1 blkcg: fix blkcg_... |
1440 |
list_for_each_entry(blkcg, &all_blkcgs, all_blkcgs_node) { |
e4a9bde95 blkcg: replace bl... |
1441 1442 1443 1444 |
if (blkcg->cpd[pol->plid]) { pol->cpd_free_fn(blkcg->cpd[pol->plid]); blkcg->cpd[pol->plid] = NULL; } |
06b285bd1 blkcg: fix blkcg_... |
1445 1446 |
} } |
3c798398e blkcg: mass renam... |
1447 |
blkcg_policy[pol->plid] = NULL; |
06b285bd1 blkcg: fix blkcg_... |
1448 |
|
bc0d6501a blkcg: kill blkio... |
1449 |
mutex_unlock(&blkcg_pol_mutex); |
838f13bf4 blkcg: allow blkc... |
1450 1451 |
out_unlock: mutex_unlock(&blkcg_pol_register_mutex); |
3e2520668 blkio: Implement ... |
1452 |
} |
3c798398e blkcg: mass renam... |
1453 |
EXPORT_SYMBOL_GPL(blkcg_policy_unregister); |