dm bio prison v2: new interface for the bio prison
The deferred set is gone and all methods have _v2 appended to the end of their names to allow for continued use of the original bio prison in DM thin-provisioning. Signed-off-by: Joe Thornber <ejt@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Joe Thornber
Mike Snitzer
parent
c1ae3cfa0e
commit
742c8fdc31
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@ -11,6 +11,7 @@ dm-snapshot-y += dm-snap.o dm-exception-store.o dm-snap-transient.o \
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dm-mirror-y += dm-raid1.o
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dm-log-userspace-y \
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+= dm-log-userspace-base.o dm-log-userspace-transfer.o
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dm-bio-prison-y += dm-bio-prison-v1.o dm-bio-prison-v2.o
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dm-thin-pool-y += dm-thin.o dm-thin-metadata.o
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dm-cache-y += dm-cache-target.o dm-cache-metadata.o dm-cache-policy.o
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dm-cache-smq-y += dm-cache-policy-smq.o
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@ -5,7 +5,8 @@
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*/
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#include "dm.h"
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#include "dm-bio-prison.h"
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#include "dm-bio-prison-v1.h"
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#include "dm-bio-prison-v2.h"
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#include <linux/spinlock.h>
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#include <linux/mempool.h>
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@ -398,7 +399,7 @@ EXPORT_SYMBOL_GPL(dm_deferred_set_add_work);
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/*----------------------------------------------------------------*/
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static int __init dm_bio_prison_init(void)
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static int __init dm_bio_prison_init_v1(void)
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{
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_cell_cache = KMEM_CACHE(dm_bio_prison_cell, 0);
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if (!_cell_cache)
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@ -407,12 +408,51 @@ static int __init dm_bio_prison_init(void)
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return 0;
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}
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static void __exit dm_bio_prison_exit(void)
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static void dm_bio_prison_exit_v1(void)
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{
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kmem_cache_destroy(_cell_cache);
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_cell_cache = NULL;
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}
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static int (*_inits[])(void) __initdata = {
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dm_bio_prison_init_v1,
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dm_bio_prison_init_v2,
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};
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static void (*_exits[])(void) = {
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dm_bio_prison_exit_v1,
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dm_bio_prison_exit_v2,
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};
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static int __init dm_bio_prison_init(void)
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{
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const int count = ARRAY_SIZE(_inits);
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int r, i;
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for (i = 0; i < count; i++) {
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r = _inits[i]();
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if (r)
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goto bad;
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}
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return 0;
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bad:
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while (i--)
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_exits[i]();
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return r;
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}
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static void __exit dm_bio_prison_exit(void)
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{
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int i = ARRAY_SIZE(_exits);
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while (i--)
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_exits[i]();
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}
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/*
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* module hooks
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*/
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@ -1,5 +1,5 @@
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/*
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* Copyright (C) 2011-2012 Red Hat, Inc.
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* Copyright (C) 2011-2017 Red Hat, Inc.
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*
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* This file is released under the GPL.
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*/
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@ -0,0 +1,369 @@
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/*
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* Copyright (C) 2012-2017 Red Hat, Inc.
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*
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* This file is released under the GPL.
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*/
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#include "dm.h"
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#include "dm-bio-prison-v2.h"
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#include <linux/spinlock.h>
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#include <linux/mempool.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/rwsem.h>
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/*----------------------------------------------------------------*/
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#define MIN_CELLS 1024
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struct dm_bio_prison_v2 {
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struct workqueue_struct *wq;
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spinlock_t lock;
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mempool_t *cell_pool;
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struct rb_root cells;
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};
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static struct kmem_cache *_cell_cache;
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/*----------------------------------------------------------------*/
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/*
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* @nr_cells should be the number of cells you want in use _concurrently_.
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* Don't confuse it with the number of distinct keys.
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*/
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struct dm_bio_prison_v2 *dm_bio_prison_create_v2(struct workqueue_struct *wq)
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{
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struct dm_bio_prison_v2 *prison = kmalloc(sizeof(*prison), GFP_KERNEL);
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if (!prison)
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return NULL;
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prison->wq = wq;
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spin_lock_init(&prison->lock);
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prison->cell_pool = mempool_create_slab_pool(MIN_CELLS, _cell_cache);
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if (!prison->cell_pool) {
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kfree(prison);
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return NULL;
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}
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prison->cells = RB_ROOT;
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return prison;
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}
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EXPORT_SYMBOL_GPL(dm_bio_prison_create_v2);
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void dm_bio_prison_destroy_v2(struct dm_bio_prison_v2 *prison)
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{
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mempool_destroy(prison->cell_pool);
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kfree(prison);
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}
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EXPORT_SYMBOL_GPL(dm_bio_prison_destroy_v2);
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struct dm_bio_prison_cell_v2 *dm_bio_prison_alloc_cell_v2(struct dm_bio_prison_v2 *prison, gfp_t gfp)
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{
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return mempool_alloc(prison->cell_pool, gfp);
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}
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EXPORT_SYMBOL_GPL(dm_bio_prison_alloc_cell_v2);
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void dm_bio_prison_free_cell_v2(struct dm_bio_prison_v2 *prison,
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struct dm_bio_prison_cell_v2 *cell)
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{
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mempool_free(cell, prison->cell_pool);
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}
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EXPORT_SYMBOL_GPL(dm_bio_prison_free_cell_v2);
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static void __setup_new_cell(struct dm_cell_key_v2 *key,
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struct dm_bio_prison_cell_v2 *cell)
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{
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memset(cell, 0, sizeof(*cell));
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memcpy(&cell->key, key, sizeof(cell->key));
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bio_list_init(&cell->bios);
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}
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static int cmp_keys(struct dm_cell_key_v2 *lhs,
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struct dm_cell_key_v2 *rhs)
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{
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if (lhs->virtual < rhs->virtual)
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return -1;
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if (lhs->virtual > rhs->virtual)
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return 1;
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if (lhs->dev < rhs->dev)
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return -1;
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if (lhs->dev > rhs->dev)
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return 1;
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if (lhs->block_end <= rhs->block_begin)
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return -1;
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if (lhs->block_begin >= rhs->block_end)
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return 1;
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return 0;
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}
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/*
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* Returns true if node found, otherwise it inserts a new one.
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*/
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static bool __find_or_insert(struct dm_bio_prison_v2 *prison,
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struct dm_cell_key_v2 *key,
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struct dm_bio_prison_cell_v2 *cell_prealloc,
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struct dm_bio_prison_cell_v2 **result)
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{
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int r;
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struct rb_node **new = &prison->cells.rb_node, *parent = NULL;
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while (*new) {
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struct dm_bio_prison_cell_v2 *cell =
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container_of(*new, struct dm_bio_prison_cell_v2, node);
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r = cmp_keys(key, &cell->key);
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parent = *new;
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if (r < 0)
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new = &((*new)->rb_left);
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else if (r > 0)
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new = &((*new)->rb_right);
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else {
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*result = cell;
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return true;
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}
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}
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__setup_new_cell(key, cell_prealloc);
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*result = cell_prealloc;
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rb_link_node(&cell_prealloc->node, parent, new);
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rb_insert_color(&cell_prealloc->node, &prison->cells);
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return false;
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}
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static bool __get(struct dm_bio_prison_v2 *prison,
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struct dm_cell_key_v2 *key,
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unsigned lock_level,
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struct bio *inmate,
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struct dm_bio_prison_cell_v2 *cell_prealloc,
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struct dm_bio_prison_cell_v2 **cell)
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{
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if (__find_or_insert(prison, key, cell_prealloc, cell)) {
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if ((*cell)->exclusive_lock) {
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if (lock_level <= (*cell)->exclusive_level) {
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bio_list_add(&(*cell)->bios, inmate);
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return false;
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}
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}
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(*cell)->shared_count++;
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} else
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(*cell)->shared_count = 1;
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return true;
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}
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bool dm_cell_get_v2(struct dm_bio_prison_v2 *prison,
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struct dm_cell_key_v2 *key,
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unsigned lock_level,
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struct bio *inmate,
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struct dm_bio_prison_cell_v2 *cell_prealloc,
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struct dm_bio_prison_cell_v2 **cell_result)
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{
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int r;
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unsigned long flags;
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spin_lock_irqsave(&prison->lock, flags);
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r = __get(prison, key, lock_level, inmate, cell_prealloc, cell_result);
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spin_unlock_irqrestore(&prison->lock, flags);
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return r;
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}
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EXPORT_SYMBOL_GPL(dm_cell_get_v2);
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static bool __put(struct dm_bio_prison_v2 *prison,
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struct dm_bio_prison_cell_v2 *cell)
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{
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BUG_ON(!cell->shared_count);
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cell->shared_count--;
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// FIXME: shared locks granted above the lock level could starve this
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if (!cell->shared_count) {
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if (cell->exclusive_lock){
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if (cell->quiesce_continuation) {
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queue_work(prison->wq, cell->quiesce_continuation);
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cell->quiesce_continuation = NULL;
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}
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} else {
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rb_erase(&cell->node, &prison->cells);
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return true;
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}
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}
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return false;
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}
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bool dm_cell_put_v2(struct dm_bio_prison_v2 *prison,
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struct dm_bio_prison_cell_v2 *cell)
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{
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bool r;
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unsigned long flags;
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spin_lock_irqsave(&prison->lock, flags);
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r = __put(prison, cell);
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spin_unlock_irqrestore(&prison->lock, flags);
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return r;
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}
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EXPORT_SYMBOL_GPL(dm_cell_put_v2);
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static int __lock(struct dm_bio_prison_v2 *prison,
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struct dm_cell_key_v2 *key,
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unsigned lock_level,
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struct dm_bio_prison_cell_v2 *cell_prealloc,
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struct dm_bio_prison_cell_v2 **cell_result)
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{
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struct dm_bio_prison_cell_v2 *cell;
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if (__find_or_insert(prison, key, cell_prealloc, &cell)) {
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if (cell->exclusive_lock)
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return -EBUSY;
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cell->exclusive_lock = true;
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cell->exclusive_level = lock_level;
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*cell_result = cell;
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// FIXME: we don't yet know what level these shared locks
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// were taken at, so have to quiesce them all.
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return cell->shared_count > 0;
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} else {
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cell = cell_prealloc;
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cell->shared_count = 0;
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cell->exclusive_lock = true;
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cell->exclusive_level = lock_level;
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*cell_result = cell;
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}
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return 0;
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}
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int dm_cell_lock_v2(struct dm_bio_prison_v2 *prison,
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struct dm_cell_key_v2 *key,
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unsigned lock_level,
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struct dm_bio_prison_cell_v2 *cell_prealloc,
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struct dm_bio_prison_cell_v2 **cell_result)
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{
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int r;
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unsigned long flags;
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spin_lock_irqsave(&prison->lock, flags);
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r = __lock(prison, key, lock_level, cell_prealloc, cell_result);
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spin_unlock_irqrestore(&prison->lock, flags);
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return r;
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}
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EXPORT_SYMBOL_GPL(dm_cell_lock_v2);
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static void __quiesce(struct dm_bio_prison_v2 *prison,
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struct dm_bio_prison_cell_v2 *cell,
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struct work_struct *continuation)
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{
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if (!cell->shared_count)
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queue_work(prison->wq, continuation);
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else
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cell->quiesce_continuation = continuation;
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}
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void dm_cell_quiesce_v2(struct dm_bio_prison_v2 *prison,
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struct dm_bio_prison_cell_v2 *cell,
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struct work_struct *continuation)
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{
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unsigned long flags;
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spin_lock_irqsave(&prison->lock, flags);
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__quiesce(prison, cell, continuation);
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spin_unlock_irqrestore(&prison->lock, flags);
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}
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EXPORT_SYMBOL_GPL(dm_cell_quiesce_v2);
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static int __promote(struct dm_bio_prison_v2 *prison,
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struct dm_bio_prison_cell_v2 *cell,
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unsigned new_lock_level)
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{
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if (!cell->exclusive_lock)
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return -EINVAL;
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cell->exclusive_level = new_lock_level;
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return cell->shared_count > 0;
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}
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int dm_cell_lock_promote_v2(struct dm_bio_prison_v2 *prison,
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struct dm_bio_prison_cell_v2 *cell,
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unsigned new_lock_level)
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{
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int r;
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unsigned long flags;
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spin_lock_irqsave(&prison->lock, flags);
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r = __promote(prison, cell, new_lock_level);
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spin_unlock_irqrestore(&prison->lock, flags);
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return r;
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}
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EXPORT_SYMBOL_GPL(dm_cell_lock_promote_v2);
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static bool __unlock(struct dm_bio_prison_v2 *prison,
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struct dm_bio_prison_cell_v2 *cell,
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struct bio_list *bios)
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{
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BUG_ON(!cell->exclusive_lock);
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bio_list_merge(bios, &cell->bios);
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bio_list_init(&cell->bios);
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if (cell->shared_count) {
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cell->exclusive_lock = 0;
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return false;
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}
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rb_erase(&cell->node, &prison->cells);
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return true;
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}
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bool dm_cell_unlock_v2(struct dm_bio_prison_v2 *prison,
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struct dm_bio_prison_cell_v2 *cell,
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struct bio_list *bios)
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{
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bool r;
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unsigned long flags;
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spin_lock_irqsave(&prison->lock, flags);
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r = __unlock(prison, cell, bios);
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spin_unlock_irqrestore(&prison->lock, flags);
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return r;
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}
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EXPORT_SYMBOL_GPL(dm_cell_unlock_v2);
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/*----------------------------------------------------------------*/
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int __init dm_bio_prison_init_v2(void)
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{
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_cell_cache = KMEM_CACHE(dm_bio_prison_cell_v2, 0);
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if (!_cell_cache)
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return -ENOMEM;
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return 0;
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}
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void dm_bio_prison_exit_v2(void)
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{
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kmem_cache_destroy(_cell_cache);
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_cell_cache = NULL;
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}
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@ -0,0 +1,152 @@
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/*
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* Copyright (C) 2011-2017 Red Hat, Inc.
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*
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* This file is released under the GPL.
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*/
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#ifndef DM_BIO_PRISON_V2_H
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#define DM_BIO_PRISON_V2_H
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#include "persistent-data/dm-block-manager.h" /* FIXME: for dm_block_t */
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#include "dm-thin-metadata.h" /* FIXME: for dm_thin_id */
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#include <linux/bio.h>
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#include <linux/rbtree.h>
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#include <linux/workqueue.h>
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/*----------------------------------------------------------------*/
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int dm_bio_prison_init_v2(void);
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void dm_bio_prison_exit_v2(void);
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/*
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* Sometimes we can't deal with a bio straight away. We put them in prison
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* where they can't cause any mischief. Bios are put in a cell identified
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* by a key, multiple bios can be in the same cell. When the cell is
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* subsequently unlocked the bios become available.
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*/
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struct dm_bio_prison_v2;
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/*
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* Keys define a range of blocks within either a virtual or physical
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* device.
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*/
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struct dm_cell_key_v2 {
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int virtual;
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dm_thin_id dev;
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dm_block_t block_begin, block_end;
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};
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/*
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* Treat this as opaque, only in header so callers can manage allocation
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* themselves.
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*/
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struct dm_bio_prison_cell_v2 {
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||||
// FIXME: pack these
|
||||
bool exclusive_lock;
|
||||
unsigned exclusive_level;
|
||||
unsigned shared_count;
|
||||
struct work_struct *quiesce_continuation;
|
||||
|
||||
struct rb_node node;
|
||||
struct dm_cell_key_v2 key;
|
||||
struct bio_list bios;
|
||||
};
|
||||
|
||||
struct dm_bio_prison_v2 *dm_bio_prison_create_v2(struct workqueue_struct *wq);
|
||||
void dm_bio_prison_destroy_v2(struct dm_bio_prison_v2 *prison);
|
||||
|
||||
/*
|
||||
* These two functions just wrap a mempool. This is a transitory step:
|
||||
* Eventually all bio prison clients should manage their own cell memory.
|
||||
*
|
||||
* Like mempool_alloc(), dm_bio_prison_alloc_cell_v2() can only fail if called
|
||||
* in interrupt context or passed GFP_NOWAIT.
|
||||
*/
|
||||
struct dm_bio_prison_cell_v2 *dm_bio_prison_alloc_cell_v2(struct dm_bio_prison_v2 *prison,
|
||||
gfp_t gfp);
|
||||
void dm_bio_prison_free_cell_v2(struct dm_bio_prison_v2 *prison,
|
||||
struct dm_bio_prison_cell_v2 *cell);
|
||||
|
||||
/*
|
||||
* Shared locks have a bio associated with them.
|
||||
*
|
||||
* If the lock is granted the caller can continue to use the bio, and must
|
||||
* call dm_cell_put_v2() to drop the reference count when finished using it.
|
||||
*
|
||||
* If the lock cannot be granted then the bio will be tracked within the
|
||||
* cell, and later given to the holder of the exclusive lock.
|
||||
*
|
||||
* See dm_cell_lock_v2() for discussion of the lock_level parameter.
|
||||
*
|
||||
* Compare *cell_result with cell_prealloc to see if the prealloc was used.
|
||||
* If cell_prealloc was used then inmate wasn't added to it.
|
||||
*
|
||||
* Returns true if the lock is granted.
|
||||
*/
|
||||
bool dm_cell_get_v2(struct dm_bio_prison_v2 *prison,
|
||||
struct dm_cell_key_v2 *key,
|
||||
unsigned lock_level,
|
||||
struct bio *inmate,
|
||||
struct dm_bio_prison_cell_v2 *cell_prealloc,
|
||||
struct dm_bio_prison_cell_v2 **cell_result);
|
||||
|
||||
/*
|
||||
* Decrement the shared reference count for the lock. Returns true if
|
||||
* returning ownership of the cell (ie. you should free it).
|
||||
*/
|
||||
bool dm_cell_put_v2(struct dm_bio_prison_v2 *prison,
|
||||
struct dm_bio_prison_cell_v2 *cell);
|
||||
|
||||
/*
|
||||
* Locks a cell. No associated bio. Exclusive locks get priority. These
|
||||
* locks constrain whether the io locks are granted according to level.
|
||||
*
|
||||
* Shared locks will still be granted if the lock_level is > (not = to) the
|
||||
* exclusive lock level.
|
||||
*
|
||||
* If an _exclusive_ lock is already held then -EBUSY is returned.
|
||||
*
|
||||
* Return values:
|
||||
* < 0 - error
|
||||
* 0 - locked; no quiescing needed
|
||||
* 1 - locked; quiescing needed
|
||||
*/
|
||||
int dm_cell_lock_v2(struct dm_bio_prison_v2 *prison,
|
||||
struct dm_cell_key_v2 *key,
|
||||
unsigned lock_level,
|
||||
struct dm_bio_prison_cell_v2 *cell_prealloc,
|
||||
struct dm_bio_prison_cell_v2 **cell_result);
|
||||
|
||||
void dm_cell_quiesce_v2(struct dm_bio_prison_v2 *prison,
|
||||
struct dm_bio_prison_cell_v2 *cell,
|
||||
struct work_struct *continuation);
|
||||
|
||||
/*
|
||||
* Promotes an _exclusive_ lock to a higher lock level.
|
||||
*
|
||||
* Return values:
|
||||
* < 0 - error
|
||||
* 0 - promoted; no quiescing needed
|
||||
* 1 - promoted; quiescing needed
|
||||
*/
|
||||
int dm_cell_lock_promote_v2(struct dm_bio_prison_v2 *prison,
|
||||
struct dm_bio_prison_cell_v2 *cell,
|
||||
unsigned new_lock_level);
|
||||
|
||||
/*
|
||||
* Adds any held bios to the bio list.
|
||||
*
|
||||
* There may be shared locks still held at this point even if you quiesced
|
||||
* (ie. different lock levels).
|
||||
*
|
||||
* Returns true if returning ownership of the cell (ie. you should free
|
||||
* it).
|
||||
*/
|
||||
bool dm_cell_unlock_v2(struct dm_bio_prison_v2 *prison,
|
||||
struct dm_bio_prison_cell_v2 *cell,
|
||||
struct bio_list *bios);
|
||||
|
||||
/*----------------------------------------------------------------*/
|
||||
|
||||
#endif
|
||||
|
|
@ -5,7 +5,7 @@
|
|||
*/
|
||||
|
||||
#include "dm.h"
|
||||
#include "dm-bio-prison.h"
|
||||
#include "dm-bio-prison-v1.h"
|
||||
#include "dm-bio-record.h"
|
||||
#include "dm-cache-metadata.h"
|
||||
|
||||
|
|
|
|||
|
|
@ -5,7 +5,7 @@
|
|||
*/
|
||||
|
||||
#include "dm-thin-metadata.h"
|
||||
#include "dm-bio-prison.h"
|
||||
#include "dm-bio-prison-v1.h"
|
||||
#include "dm.h"
|
||||
|
||||
#include <linux/device-mapper.h>
|
||||
|
|
|
|||
Loading…
Reference in New Issue