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md update for v3.12

Browse source 
Headline item is multithreading for RAID5 so that more
 IO/sec can be supported on fast (SSD) devices.
 Also TILE-Gx SIMD suppor for RAID6 calculations and an
 assortment of bug fixes.
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Merge tag 'md/3.12' of git://neil.brown.name/md

Pull md update from Neil Brown:
 "Headline item is multithreading for RAID5 so that more IO/sec can be
  supported on fast (SSD) devices.  Also TILE-Gx SIMD suppor for RAID6
  calculations and an assortment of bug fixes"

* tag 'md/3.12' of git://neil.brown.name/md:
  raid5: only wakeup necessary threads
  md/raid5: flush out all pending requests before proceeding with reshape.
  md/raid5: use seqcount to protect access to shape in make_request.
  raid5: sysfs entry to control worker thread number
  raid5: offload stripe handle to workqueue
  raid5: fix stripe release order
  raid5: make release_stripe lockless
  md: avoid deadlock when dirty buffers during md_stop.
  md: Don't test all of mddev->flags at once.
  md: Fix apparent cut-and-paste error in super_90_validate
  raid6/test: replace echo -e with printf
  RAID: add tilegx SIMD implementation of raid6
  md: fix safe_mode buglet.
  md: don't call md_allow_write in get_bitmap_file.
This commit is contained in:
Linus Torvalds 2013-09-10 13:03:41 -07:00
commit 4d7696f1b0
9 changed files with 510 additions and 41 deletions
Download patch file Download diff file Expand all files Collapse all files

54
drivers/md/md.c
View file

@ -1180,7 +1180,7 @@ static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev)
mddev->bitmap_info.offset =
mddev->bitmap_info.default_offset;
mddev->bitmap_info.space =
mddev->bitmap_info.space;
mddev->bitmap_info.default_space;
}
} else if (mddev->pers == NULL) {
@ -3429,7 +3429,7 @@ safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len)
mddev->safemode_delay = (msec*HZ)/1000;
if (mddev->safemode_delay == 0)
mddev->safemode_delay = 1;
if (mddev->safemode_delay < old_delay)
if (mddev->safemode_delay < old_delay || old_delay == 0)
md_safemode_timeout((unsigned long)mddev);
}
return len;
@ -5144,7 +5144,7 @@ int md_run(struct mddev *mddev)
set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
if (mddev->flags)
if (mddev->flags & MD_UPDATE_SB_FLAGS)
md_update_sb(mddev, 0);
md_new_event(mddev);
@ -5289,7 +5289,7 @@ static void __md_stop_writes(struct mddev *mddev)
md_super_wait(mddev);
if (mddev->ro == 0 &&
(!mddev->in_sync || mddev->flags)) {
(!mddev->in_sync || (mddev->flags & MD_UPDATE_SB_FLAGS))) {
/* mark array as shutdown cleanly */
mddev->in_sync = 1;
md_update_sb(mddev, 1);
@ -5337,8 +5337,14 @@ static int md_set_readonly(struct mddev *mddev, struct block_device *bdev)
err = -EBUSY;
goto out;
}
if (bdev)
sync_blockdev(bdev);
if (bdev && !test_bit(MD_STILL_CLOSED, &mddev->flags)) {
/* Someone opened the device since we flushed it
* so page cache could be dirty and it is too late
* to flush. So abort
*/
mutex_unlock(&mddev->open_mutex);
return -EBUSY;
}
if (mddev->pers) {
__md_stop_writes(mddev);
@ -5373,14 +5379,14 @@ static int do_md_stop(struct mddev * mddev, int mode,
mutex_unlock(&mddev->open_mutex);
return -EBUSY;
}
if (bdev)
/* It is possible IO was issued on some other
* open file which was closed before we took ->open_mutex.
* As that was not the last close __blkdev_put will not
* have called sync_blockdev, so we must.
if (bdev && !test_bit(MD_STILL_CLOSED, &mddev->flags)) {
/* Someone opened the device since we flushed it
* so page cache could be dirty and it is too late
* to flush. So abort
*/
sync_blockdev(bdev);
mutex_unlock(&mddev->open_mutex);
return -EBUSY;
}
if (mddev->pers) {
if (mddev->ro)
set_disk_ro(disk, 0);
@ -5628,10 +5634,7 @@ static int get_bitmap_file(struct mddev * mddev, void __user * arg)
char *ptr, *buf = NULL;
int err = -ENOMEM;
if (md_allow_write(mddev))
file = kmalloc(sizeof(*file), GFP_NOIO);
else
file = kmalloc(sizeof(*file), GFP_KERNEL);
file = kmalloc(sizeof(*file), GFP_NOIO);
if (!file)
goto out;
@ -6420,6 +6423,20 @@ static int md_ioctl(struct block_device *bdev, fmode_t mode,
!test_bit(MD_RECOVERY_NEEDED,
&mddev->flags),
msecs_to_jiffies(5000));
if (cmd == STOP_ARRAY || cmd == STOP_ARRAY_RO) {
/* Need to flush page cache, and ensure no-one else opens
* and writes
*/
mutex_lock(&mddev->open_mutex);
if (atomic_read(&mddev->openers) > 1) {
mutex_unlock(&mddev->open_mutex);
err = -EBUSY;
goto abort;
}
set_bit(MD_STILL_CLOSED, &mddev->flags);
mutex_unlock(&mddev->open_mutex);
sync_blockdev(bdev);
}
err = mddev_lock(mddev);
if (err) {
printk(KERN_INFO
@ -6673,6 +6690,7 @@ static int md_open(struct block_device *bdev, fmode_t mode)
err = 0;
atomic_inc(&mddev->openers);
clear_bit(MD_STILL_CLOSED, &mddev->flags);
mutex_unlock(&mddev->open_mutex);
check_disk_change(bdev);
@ -7817,7 +7835,7 @@ void md_check_recovery(struct mddev *mddev)
sysfs_notify_dirent_safe(mddev->sysfs_state);
}
if (mddev->flags)
if (mddev->flags & MD_UPDATE_SB_FLAGS)
md_update_sb(mddev, 0);
if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&

8
drivers/md/md.h
View file

@ -204,12 +204,16 @@ struct mddev {
struct md_personality *pers;
dev_t unit;
int md_minor;
struct list_head disks;
struct list_head disks;
unsigned long flags;
#define MD_CHANGE_DEVS 0 /* Some device status has changed */
#define MD_CHANGE_CLEAN 1 /* transition to or from 'clean' */
#define MD_CHANGE_PENDING 2 /* switch from 'clean' to 'active' in progress */
#define MD_UPDATE_SB_FLAGS (1 | 2 | 4) /* If these are set, md_update_sb needed */
#define MD_ARRAY_FIRST_USE 3 /* First use of array, needs initialization */
#define MD_STILL_CLOSED 4 /* If set, then array has not been opened since
* md_ioctl checked on it.
*/
int suspended;
atomic_t active_io;
@ -218,7 +222,7 @@ struct mddev {
* are happening, so run/
* takeover/stop are not safe
*/
int ready; /* See when safe to pass
int ready; /* See when safe to pass
* IO requests down */
struct gendisk *gendisk;

362
drivers/md/raid5.c
View file

@ -53,6 +53,7 @@
#include <linux/cpu.h>
#include <linux/slab.h>
#include <linux/ratelimit.h>
#include <linux/nodemask.h>
#include <trace/events/block.h>
#include "md.h"
@ -60,6 +61,10 @@
#include "raid0.h"
#include "bitmap.h"
#define cpu_to_group(cpu) cpu_to_node(cpu)
#define ANY_GROUP NUMA_NO_NODE
static struct workqueue_struct *raid5_wq;
/*
* Stripe cache
*/
@ -72,6 +77,7 @@
#define BYPASS_THRESHOLD 1
#define NR_HASH (PAGE_SIZE / sizeof(struct hlist_head))
#define HASH_MASK (NR_HASH - 1)
#define MAX_STRIPE_BATCH 8
static inline struct hlist_head *stripe_hash(struct r5conf *conf, sector_t sect)
{
@ -200,6 +206,49 @@ static int stripe_operations_active(struct stripe_head *sh)
test_bit(STRIPE_COMPUTE_RUN, &sh->state);
}
static void raid5_wakeup_stripe_thread(struct stripe_head *sh)
{
struct r5conf *conf = sh->raid_conf;
struct r5worker_group *group;
int thread_cnt;
int i, cpu = sh->cpu;
if (!cpu_online(cpu)) {
cpu = cpumask_any(cpu_online_mask);
sh->cpu = cpu;
}
if (list_empty(&sh->lru)) {
struct r5worker_group *group;
group = conf->worker_groups + cpu_to_group(cpu);
list_add_tail(&sh->lru, &group->handle_list);
group->stripes_cnt++;
sh->group = group;
}
if (conf->worker_cnt_per_group == 0) {
md_wakeup_thread(conf->mddev->thread);
return;
}
group = conf->worker_groups + cpu_to_group(sh->cpu);
group->workers[0].working = true;
/* at least one worker should run to avoid race */
queue_work_on(sh->cpu, raid5_wq, &group->workers[0].work);
thread_cnt = group->stripes_cnt / MAX_STRIPE_BATCH - 1;
/* wakeup more workers */
for (i = 1; i < conf->worker_cnt_per_group && thread_cnt > 0; i++) {
if (group->workers[i].working == false) {
group->workers[i].working = true;
queue_work_on(sh->cpu, raid5_wq,
&group->workers[i].work);
thread_cnt--;
}
}
}
static void do_release_stripe(struct r5conf *conf, struct stripe_head *sh)
{
BUG_ON(!list_empty(&sh->lru));
@ -214,7 +263,12 @@ static void do_release_stripe(struct r5conf *conf, struct stripe_head *sh)
else {
clear_bit(STRIPE_DELAYED, &sh->state);
clear_bit(STRIPE_BIT_DELAY, &sh->state);
list_add_tail(&sh->lru, &conf->handle_list);
if (conf->worker_cnt_per_group == 0) {
list_add_tail(&sh->lru, &conf->handle_list);
} else {
raid5_wakeup_stripe_thread(sh);
return;
}
}
md_wakeup_thread(conf->mddev->thread);
} else {
@ -239,12 +293,62 @@ static void __release_stripe(struct r5conf *conf, struct stripe_head *sh)
do_release_stripe(conf, sh);
}
static struct llist_node *llist_reverse_order(struct llist_node *head)
{
struct llist_node *new_head = NULL;
while (head) {
struct llist_node *tmp = head;
head = head->next;
tmp->next = new_head;
new_head = tmp;
}
return new_head;
}
/* should hold conf->device_lock already */
static int release_stripe_list(struct r5conf *conf)
{
struct stripe_head *sh;
int count = 0;
struct llist_node *head;
head = llist_del_all(&conf->released_stripes);
head = llist_reverse_order(head);
while (head) {
sh = llist_entry(head, struct stripe_head, release_list);
head = llist_next(head);
/* sh could be readded after STRIPE_ON_RELEASE_LIST is cleard */
smp_mb();
clear_bit(STRIPE_ON_RELEASE_LIST, &sh->state);
/*
* Don't worry the bit is set here, because if the bit is set
* again, the count is always > 1. This is true for
* STRIPE_ON_UNPLUG_LIST bit too.
*/
__release_stripe(conf, sh);
count++;
}
return count;
}
static void release_stripe(struct stripe_head *sh)
{
struct r5conf *conf = sh->raid_conf;
unsigned long flags;
bool wakeup;
if (test_and_set_bit(STRIPE_ON_RELEASE_LIST, &sh->state))
goto slow_path;
wakeup = llist_add(&sh->release_list, &conf->released_stripes);
if (wakeup)
md_wakeup_thread(conf->mddev->thread);
return;
slow_path:
local_irq_save(flags);
/* we are ok here if STRIPE_ON_RELEASE_LIST is set or not */
if (atomic_dec_and_lock(&sh->count, &conf->device_lock)) {
do_release_stripe(conf, sh);
spin_unlock(&conf->device_lock);
@ -359,6 +463,7 @@ static void init_stripe(struct stripe_head *sh, sector_t sector, int previous)
raid5_build_block(sh, i, previous);
}
insert_hash(conf, sh);
sh->cpu = smp_processor_id();
}
static struct stripe_head *__find_stripe(struct r5conf *conf, sector_t sector,
@ -491,7 +596,8 @@ get_active_stripe(struct r5conf *conf, sector_t sector,
if (atomic_read(&sh->count)) {
BUG_ON(!list_empty(&sh->lru)
&& !test_bit(STRIPE_EXPANDING, &sh->state)
&& !test_bit(STRIPE_ON_UNPLUG_LIST, &sh->state));
&& !test_bit(STRIPE_ON_UNPLUG_LIST, &sh->state)
&& !test_bit(STRIPE_ON_RELEASE_LIST, &sh->state));
} else {
if (!test_bit(STRIPE_HANDLE, &sh->state))
atomic_inc(&conf->active_stripes);
@ -499,6 +605,10 @@ get_active_stripe(struct r5conf *conf, sector_t sector,
!test_bit(STRIPE_EXPANDING, &sh->state))
BUG();
list_del_init(&sh->lru);
if (sh->group) {
sh->group->stripes_cnt--;
sh->group = NULL;
}
}
}
} while (sh == NULL);
@ -3779,6 +3889,7 @@ static void raid5_activate_delayed(struct r5conf *conf)
if (!test_and_set_bit(STRIPE_PREREAD_ACTIVE, &sh->state))
atomic_inc(&conf->preread_active_stripes);
list_add_tail(&sh->lru, &conf->hold_list);
raid5_wakeup_stripe_thread(sh);
}
}
}
@ -4058,18 +4169,35 @@ static int chunk_aligned_read(struct mddev *mddev, struct bio * raid_bio)
* head of the hold_list has changed, i.e. the head was promoted to the
* handle_list.
*/
static struct stripe_head *__get_priority_stripe(struct r5conf *conf)
static struct stripe_head *__get_priority_stripe(struct r5conf *conf, int group)
{
struct stripe_head *sh;
struct stripe_head *sh = NULL, *tmp;
struct list_head *handle_list = NULL;
struct r5worker_group *wg = NULL;
if (conf->worker_cnt_per_group == 0) {
handle_list = &conf->handle_list;
} else if (group != ANY_GROUP) {
handle_list = &conf->worker_groups[group].handle_list;
wg = &conf->worker_groups[group];
} else {
int i;
for (i = 0; i < conf->group_cnt; i++) {
handle_list = &conf->worker_groups[i].handle_list;
wg = &conf->worker_groups[i];
if (!list_empty(handle_list))
break;
}
}
pr_debug("%s: handle: %s hold: %s full_writes: %d bypass_count: %d\n",
__func__,
list_empty(&conf->handle_list) ? "empty" : "busy",
list_empty(handle_list) ? "empty" : "busy",
list_empty(&conf->hold_list) ? "empty" : "busy",
atomic_read(&conf->pending_full_writes), conf->bypass_count);
if (!list_empty(&conf->handle_list)) {
sh = list_entry(conf->handle_list.next, typeof(*sh), lru);
if (!list_empty(handle_list)) {
sh = list_entry(handle_list->next, typeof(*sh), lru);
if (list_empty(&conf->hold_list))
conf->bypass_count = 0;
@ -4087,14 +4215,32 @@ static struct stripe_head *__get_priority_stripe(struct r5conf *conf)
((conf->bypass_threshold &&
conf->bypass_count > conf->bypass_threshold) ||
atomic_read(&conf->pending_full_writes) == 0)) {
sh = list_entry(conf->hold_list.next,
typeof(*sh), lru);
conf->bypass_count -= conf->bypass_threshold;
if (conf->bypass_count < 0)
conf->bypass_count = 0;
} else
list_for_each_entry(tmp, &conf->hold_list, lru) {
if (conf->worker_cnt_per_group == 0 ||
group == ANY_GROUP ||
!cpu_online(tmp->cpu) ||
cpu_to_group(tmp->cpu) == group) {
sh = tmp;
break;
}
}
if (sh) {
conf->bypass_count -= conf->bypass_threshold;
if (conf->bypass_count < 0)
conf->bypass_count = 0;
}
wg = NULL;
}
if (!sh)
return NULL;
if (wg) {
wg->stripes_cnt--;
sh->group = NULL;
}
list_del_init(&sh->lru);
atomic_inc(&sh->count);
BUG_ON(atomic_read(&sh->count) != 1);
@ -4127,6 +4273,10 @@ static void raid5_unplug(struct blk_plug_cb *blk_cb, bool from_schedule)
*/
smp_mb__before_clear_bit();
clear_bit(STRIPE_ON_UNPLUG_LIST, &sh->state);
/*
* STRIPE_ON_RELEASE_LIST could be set here. In that
* case, the count is always > 1 here
*/
__release_stripe(conf, sh);
cnt++;
}
@ -4286,8 +4436,10 @@ static void make_request(struct mddev *mddev, struct bio * bi)
for (;logical_sector < last_sector; logical_sector += STRIPE_SECTORS) {
DEFINE_WAIT(w);
int previous;
int seq;
retry:
seq = read_seqcount_begin(&conf->gen_lock);
previous = 0;
prepare_to_wait(&conf->wait_for_overlap, &w, TASK_UNINTERRUPTIBLE);
if (unlikely(conf->reshape_progress != MaxSector)) {
@ -4320,7 +4472,7 @@ static void make_request(struct mddev *mddev, struct bio * bi)
previous,
&dd_idx, NULL);
pr_debug("raid456: make_request, sector %llu logical %llu\n",
(unsigned long long)new_sector,
(unsigned long long)new_sector,
(unsigned long long)logical_sector);
sh = get_active_stripe(conf, new_sector, previous,
@ -4349,6 +4501,13 @@ static void make_request(struct mddev *mddev, struct bio * bi)
goto retry;
}
}
if (read_seqcount_retry(&conf->gen_lock, seq)) {
/* Might have got the wrong stripe_head
* by accident
*/
release_stripe(sh);
goto retry;
}
if (rw == WRITE &&
logical_sector >= mddev->suspend_lo &&
@ -4788,14 +4947,14 @@ static int retry_aligned_read(struct r5conf *conf, struct bio *raid_bio)
return handled;
}
#define MAX_STRIPE_BATCH 8
static int handle_active_stripes(struct r5conf *conf)
static int handle_active_stripes(struct r5conf *conf, int group,
struct r5worker *worker)
{
struct stripe_head *batch[MAX_STRIPE_BATCH], *sh;
int i, batch_size = 0;
while (batch_size < MAX_STRIPE_BATCH &&
(sh = __get_priority_stripe(conf)) != NULL)
(sh = __get_priority_stripe(conf, group)) != NULL)
batch[batch_size++] = sh;
if (batch_size == 0)
@ -4813,6 +4972,39 @@ static int handle_active_stripes(struct r5conf *conf)
return batch_size;
}
static void raid5_do_work(struct work_struct *work)
{
struct r5worker *worker = container_of(work, struct r5worker, work);
struct r5worker_group *group = worker->group;
struct r5conf *conf = group->conf;
int group_id = group - conf->worker_groups;
int handled;
struct blk_plug plug;
pr_debug("+++ raid5worker active\n");
blk_start_plug(&plug);
handled = 0;
spin_lock_irq(&conf->device_lock);
while (1) {
int batch_size, released;
released = release_stripe_list(conf);
batch_size = handle_active_stripes(conf, group_id, worker);
worker->working = false;
if (!batch_size && !released)
break;
handled += batch_size;
}
pr_debug("%d stripes handled\n", handled);
spin_unlock_irq(&conf->device_lock);
blk_finish_plug(&plug);
pr_debug("--- raid5worker inactive\n");
}
/*
* This is our raid5 kernel thread.
*
@ -4836,7 +5028,9 @@ static void raid5d(struct md_thread *thread)
spin_lock_irq(&conf->device_lock);
while (1) {
struct bio *bio;
int batch_size;
int batch_size, released;
released = release_stripe_list(conf);
if (
!list_empty(&conf->bitmap_list)) {
@ -4860,8 +5054,8 @@ static void raid5d(struct md_thread *thread)
handled++;
}
batch_size = handle_active_stripes(conf);
if (!batch_size)
batch_size = handle_active_stripes(conf, ANY_GROUP, NULL);
if (!batch_size && !released)
break;
handled += batch_size;
@ -4989,10 +5183,70 @@ stripe_cache_active_show(struct mddev *mddev, char *page)
static struct md_sysfs_entry
raid5_stripecache_active = __ATTR_RO(stripe_cache_active);
static ssize_t
raid5_show_group_thread_cnt(struct mddev *mddev, char *page)
{
struct r5conf *conf = mddev->private;
if (conf)
return sprintf(page, "%d\n", conf->worker_cnt_per_group);
else
return 0;
}
static int alloc_thread_groups(struct r5conf *conf, int cnt);
static ssize_t
raid5_store_group_thread_cnt(struct mddev *mddev, const char *page, size_t len)
{
struct r5conf *conf = mddev->private;
unsigned long new;
int err;
struct r5worker_group *old_groups;
int old_group_cnt;
if (len >= PAGE_SIZE)
return -EINVAL;
if (!conf)
return -ENODEV;
if (kstrtoul(page, 10, &new))
return -EINVAL;
if (new == conf->worker_cnt_per_group)
return len;
mddev_suspend(mddev);
old_groups = conf->worker_groups;
old_group_cnt = conf->worker_cnt_per_group;
conf->worker_groups = NULL;
err = alloc_thread_groups(conf, new);
if (err) {
conf->worker_groups = old_groups;
conf->worker_cnt_per_group = old_group_cnt;
} else {
if (old_groups)
kfree(old_groups[0].workers);
kfree(old_groups);
}
mddev_resume(mddev);
if (err)
return err;
return len;
}
static struct md_sysfs_entry
raid5_group_thread_cnt = __ATTR(group_thread_cnt, S_IRUGO | S_IWUSR,
raid5_show_group_thread_cnt,
raid5_store_group_thread_cnt);
static struct attribute *raid5_attrs[] = {
&raid5_stripecache_size.attr,
&raid5_stripecache_active.attr,
&raid5_preread_bypass_threshold.attr,
&raid5_group_thread_cnt.attr,
NULL,
};
static struct attribute_group raid5_attrs_group = {
@ -5000,6 +5254,54 @@ static struct attribute_group raid5_attrs_group = {
.attrs = raid5_attrs,
};
static int alloc_thread_groups(struct r5conf *conf, int cnt)
{
int i, j;
ssize_t size;
struct r5worker *workers;
conf->worker_cnt_per_group = cnt;
if (cnt == 0) {
conf->worker_groups = NULL;
return 0;
}
conf->group_cnt = num_possible_nodes();
size = sizeof(struct r5worker) * cnt;
workers = kzalloc(size * conf->group_cnt, GFP_NOIO);
conf->worker_groups = kzalloc(sizeof(struct r5worker_group) *
conf->group_cnt, GFP_NOIO);
if (!conf->worker_groups || !workers) {
kfree(workers);
kfree(conf->worker_groups);
conf->worker_groups = NULL;
return -ENOMEM;
}
for (i = 0; i < conf->group_cnt; i++) {
struct r5worker_group *group;
group = &conf->worker_groups[i];
INIT_LIST_HEAD(&group->handle_list);
group->conf = conf;
group->workers = workers + i * cnt;
for (j = 0; j < cnt; j++) {
group->workers[j].group = group;
INIT_WORK(&group->workers[j].work, raid5_do_work);
}
}
return 0;
}
static void free_thread_groups(struct r5conf *conf)
{
if (conf->worker_groups)
kfree(conf->worker_groups[0].workers);
kfree(conf->worker_groups);
conf->worker_groups = NULL;
}
static sector_t
raid5_size(struct mddev *mddev, sector_t sectors, int raid_disks)
{
@ -5040,6 +5342,7 @@ static void raid5_free_percpu(struct r5conf *conf)
static void free_conf(struct r5conf *conf)
{
free_thread_groups(conf);
shrink_stripes(conf);
raid5_free_percpu(conf);
kfree(conf->disks);
@ -5168,7 +5471,11 @@ static struct r5conf *setup_conf(struct mddev *mddev)
conf = kzalloc(sizeof(struct r5conf), GFP_KERNEL);
if (conf == NULL)
goto abort;
/* Don't enable multi-threading by default*/
if (alloc_thread_groups(conf, 0))
goto abort;
spin_lock_init(&conf->device_lock);
seqcount_init(&conf->gen_lock);
init_waitqueue_head(&conf->wait_for_stripe);
init_waitqueue_head(&conf->wait_for_overlap);
INIT_LIST_HEAD(&conf->handle_list);
@ -5176,6 +5483,7 @@ static struct r5conf *setup_conf(struct mddev *mddev)
INIT_LIST_HEAD(&conf->delayed_list);
INIT_LIST_HEAD(&conf->bitmap_list);
INIT_LIST_HEAD(&conf->inactive_list);
init_llist_head(&conf->released_stripes);
atomic_set(&conf->active_stripes, 0);
atomic_set(&conf->preread_active_stripes, 0);
atomic_set(&conf->active_aligned_reads, 0);
@ -5980,6 +6288,7 @@ static int raid5_start_reshape(struct mddev *mddev)
atomic_set(&conf->reshape_stripes, 0);
spin_lock_irq(&conf->device_lock);
write_seqcount_begin(&conf->gen_lock);
conf->previous_raid_disks = conf->raid_disks;
conf->raid_disks += mddev->delta_disks;
conf->prev_chunk_sectors = conf->chunk_sectors;
@ -5996,8 +6305,16 @@ static int raid5_start_reshape(struct mddev *mddev)
else
conf->reshape_progress = 0;
conf->reshape_safe = conf->reshape_progress;
write_seqcount_end(&conf->gen_lock);
spin_unlock_irq(&conf->device_lock);
/* Now make sure any requests that proceeded on the assumption
* the reshape wasn't running - like Discard or Read - have
* completed.
*/
mddev_suspend(mddev);
mddev_resume(mddev);
/* Add some new drives, as many as will fit.
* We know there are enough to make the newly sized array work.
* Don't add devices if we are reducing the number of
@ -6472,6 +6789,10 @@ static struct md_personality raid4_personality =
static int __init raid5_init(void)
{
raid5_wq = alloc_workqueue("raid5wq",
WQ_UNBOUND|WQ_MEM_RECLAIM|WQ_CPU_INTENSIVE|WQ_SYSFS, 0);
if (!raid5_wq)
return -ENOMEM;
register_md_personality(&raid6_personality);
register_md_personality(&raid5_personality);
register_md_personality(&raid4_personality);
@ -6483,6 +6804,7 @@ static void raid5_exit(void)
unregister_md_personality(&raid6_personality);
unregister_md_personality(&raid5_personality);
unregister_md_personality(&raid4_personality);
destroy_workqueue(raid5_wq);
}
module_init(raid5_init);

22
drivers/md/raid5.h
View file

@ -197,6 +197,7 @@ enum reconstruct_states {
struct stripe_head {
struct hlist_node hash;
struct list_head lru; /* inactive_list or handle_list */
struct llist_node release_list;
struct r5conf *raid_conf;
short generation; /* increments with every
* reshape */
@ -211,6 +212,8 @@ struct stripe_head {
enum check_states check_state;
enum reconstruct_states reconstruct_state;
spinlock_t stripe_lock;
int cpu;
struct r5worker_group *group;
/**
* struct stripe_operations
* @target - STRIPE_OP_COMPUTE_BLK target
@ -321,6 +324,7 @@ enum {
STRIPE_OPS_REQ_PENDING,
STRIPE_ON_UNPLUG_LIST,
STRIPE_DISCARD,
STRIPE_ON_RELEASE_LIST,
};
/*
@ -363,6 +367,19 @@ struct disk_info {
struct md_rdev *rdev, *replacement;
};
struct r5worker {
struct work_struct work;
struct r5worker_group *group;
bool working;
};
struct r5worker_group {
struct list_head handle_list;
struct r5conf *conf;
struct r5worker *workers;
int stripes_cnt;
};
struct r5conf {
struct hlist_head *stripe_hashtbl;
struct mddev *mddev;
@ -386,6 +403,7 @@ struct r5conf {
int prev_chunk_sectors;
int prev_algo;
short generation; /* increments with every reshape */
seqcount_t gen_lock; /* lock against generation changes */
unsigned long reshape_checkpoint; /* Time we last updated
* metadata */
long long min_offset_diff; /* minimum difference between
@ -445,6 +463,7 @@ struct r5conf {
*/
atomic_t active_stripes;
struct list_head inactive_list;
struct llist_head released_stripes;
wait_queue_head_t wait_for_stripe;
wait_queue_head_t wait_for_overlap;
int inactive_blocked; /* release of inactive stripes blocked,
@ -458,6 +477,9 @@ struct r5conf {
* the new thread here until we fully activate the array.
*/
struct md_thread *thread;
struct r5worker_group *worker_groups;
int group_cnt;
int worker_cnt_per_group;
};
/*