Root/drivers/md/dm-region-hash.c

1/*
2 * Copyright (C) 2003 Sistina Software Limited.
3 * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
4 *
5 * This file is released under the GPL.
6 */
7
8#include <linux/dm-dirty-log.h>
9#include <linux/dm-region-hash.h>
10
11#include <linux/ctype.h>
12#include <linux/init.h>
13#include <linux/module.h>
14#include <linux/slab.h>
15#include <linux/vmalloc.h>
16
17#include "dm.h"
18
19#define DM_MSG_PREFIX "region hash"
20
21/*-----------------------------------------------------------------
22 * Region hash
23 *
24 * The mirror splits itself up into discrete regions. Each
25 * region can be in one of three states: clean, dirty,
26 * nosync. There is no need to put clean regions in the hash.
27 *
28 * In addition to being present in the hash table a region _may_
29 * be present on one of three lists.
30 *
31 * clean_regions: Regions on this list have no io pending to
32 * them, they are in sync, we are no longer interested in them,
33 * they are dull. dm_rh_update_states() will remove them from the
34 * hash table.
35 *
36 * quiesced_regions: These regions have been spun down, ready
37 * for recovery. rh_recovery_start() will remove regions from
38 * this list and hand them to kmirrord, which will schedule the
39 * recovery io with kcopyd.
40 *
41 * recovered_regions: Regions that kcopyd has successfully
42 * recovered. dm_rh_update_states() will now schedule any delayed
43 * io, up the recovery_count, and remove the region from the
44 * hash.
45 *
46 * There are 2 locks:
47 * A rw spin lock 'hash_lock' protects just the hash table,
48 * this is never held in write mode from interrupt context,
49 * which I believe means that we only have to disable irqs when
50 * doing a write lock.
51 *
52 * An ordinary spin lock 'region_lock' that protects the three
53 * lists in the region_hash, with the 'state', 'list' and
54 * 'delayed_bios' fields of the regions. This is used from irq
55 * context, so all other uses will have to suspend local irqs.
56 *---------------------------------------------------------------*/
57struct dm_region_hash {
58    uint32_t region_size;
59    unsigned region_shift;
60
61    /* holds persistent region state */
62    struct dm_dirty_log *log;
63
64    /* hash table */
65    rwlock_t hash_lock;
66    mempool_t *region_pool;
67    unsigned mask;
68    unsigned nr_buckets;
69    unsigned prime;
70    unsigned shift;
71    struct list_head *buckets;
72
73    unsigned max_recovery; /* Max # of regions to recover in parallel */
74
75    spinlock_t region_lock;
76    atomic_t recovery_in_flight;
77    struct semaphore recovery_count;
78    struct list_head clean_regions;
79    struct list_head quiesced_regions;
80    struct list_head recovered_regions;
81    struct list_head failed_recovered_regions;
82
83    /*
84     * If there was a flush failure no regions can be marked clean.
85     */
86    int flush_failure;
87
88    void *context;
89    sector_t target_begin;
90
91    /* Callback function to schedule bios writes */
92    void (*dispatch_bios)(void *context, struct bio_list *bios);
93
94    /* Callback function to wakeup callers worker thread. */
95    void (*wakeup_workers)(void *context);
96
97    /* Callback function to wakeup callers recovery waiters. */
98    void (*wakeup_all_recovery_waiters)(void *context);
99};
100
101struct dm_region {
102    struct dm_region_hash *rh; /* FIXME: can we get rid of this ? */
103    region_t key;
104    int state;
105
106    struct list_head hash_list;
107    struct list_head list;
108
109    atomic_t pending;
110    struct bio_list delayed_bios;
111};
112
113/*
114 * Conversion fns
115 */
116static region_t dm_rh_sector_to_region(struct dm_region_hash *rh, sector_t sector)
117{
118    return sector >> rh->region_shift;
119}
120
121sector_t dm_rh_region_to_sector(struct dm_region_hash *rh, region_t region)
122{
123    return region << rh->region_shift;
124}
125EXPORT_SYMBOL_GPL(dm_rh_region_to_sector);
126
127region_t dm_rh_bio_to_region(struct dm_region_hash *rh, struct bio *bio)
128{
129    return dm_rh_sector_to_region(rh, bio->bi_sector - rh->target_begin);
130}
131EXPORT_SYMBOL_GPL(dm_rh_bio_to_region);
132
133void *dm_rh_region_context(struct dm_region *reg)
134{
135    return reg->rh->context;
136}
137EXPORT_SYMBOL_GPL(dm_rh_region_context);
138
139region_t dm_rh_get_region_key(struct dm_region *reg)
140{
141    return reg->key;
142}
143EXPORT_SYMBOL_GPL(dm_rh_get_region_key);
144
145sector_t dm_rh_get_region_size(struct dm_region_hash *rh)
146{
147    return rh->region_size;
148}
149EXPORT_SYMBOL_GPL(dm_rh_get_region_size);
150
151/*
152 * FIXME: shall we pass in a structure instead of all these args to
153 * dm_region_hash_create()????
154 */
155#define RH_HASH_MULT 2654435387U
156#define RH_HASH_SHIFT 12
157
158#define MIN_REGIONS 64
159struct dm_region_hash *dm_region_hash_create(
160        void *context, void (*dispatch_bios)(void *context,
161                             struct bio_list *bios),
162        void (*wakeup_workers)(void *context),
163        void (*wakeup_all_recovery_waiters)(void *context),
164        sector_t target_begin, unsigned max_recovery,
165        struct dm_dirty_log *log, uint32_t region_size,
166        region_t nr_regions)
167{
168    struct dm_region_hash *rh;
169    unsigned nr_buckets, max_buckets;
170    size_t i;
171
172    /*
173     * Calculate a suitable number of buckets for our hash
174     * table.
175     */
176    max_buckets = nr_regions >> 6;
177    for (nr_buckets = 128u; nr_buckets < max_buckets; nr_buckets <<= 1)
178        ;
179    nr_buckets >>= 1;
180
181    rh = kmalloc(sizeof(*rh), GFP_KERNEL);
182    if (!rh) {
183        DMERR("unable to allocate region hash memory");
184        return ERR_PTR(-ENOMEM);
185    }
186
187    rh->context = context;
188    rh->dispatch_bios = dispatch_bios;
189    rh->wakeup_workers = wakeup_workers;
190    rh->wakeup_all_recovery_waiters = wakeup_all_recovery_waiters;
191    rh->target_begin = target_begin;
192    rh->max_recovery = max_recovery;
193    rh->log = log;
194    rh->region_size = region_size;
195    rh->region_shift = ffs(region_size) - 1;
196    rwlock_init(&rh->hash_lock);
197    rh->mask = nr_buckets - 1;
198    rh->nr_buckets = nr_buckets;
199
200    rh->shift = RH_HASH_SHIFT;
201    rh->prime = RH_HASH_MULT;
202
203    rh->buckets = vmalloc(nr_buckets * sizeof(*rh->buckets));
204    if (!rh->buckets) {
205        DMERR("unable to allocate region hash bucket memory");
206        kfree(rh);
207        return ERR_PTR(-ENOMEM);
208    }
209
210    for (i = 0; i < nr_buckets; i++)
211        INIT_LIST_HEAD(rh->buckets + i);
212
213    spin_lock_init(&rh->region_lock);
214    sema_init(&rh->recovery_count, 0);
215    atomic_set(&rh->recovery_in_flight, 0);
216    INIT_LIST_HEAD(&rh->clean_regions);
217    INIT_LIST_HEAD(&rh->quiesced_regions);
218    INIT_LIST_HEAD(&rh->recovered_regions);
219    INIT_LIST_HEAD(&rh->failed_recovered_regions);
220    rh->flush_failure = 0;
221
222    rh->region_pool = mempool_create_kmalloc_pool(MIN_REGIONS,
223                              sizeof(struct dm_region));
224    if (!rh->region_pool) {
225        vfree(rh->buckets);
226        kfree(rh);
227        rh = ERR_PTR(-ENOMEM);
228    }
229
230    return rh;
231}
232EXPORT_SYMBOL_GPL(dm_region_hash_create);
233
234void dm_region_hash_destroy(struct dm_region_hash *rh)
235{
236    unsigned h;
237    struct dm_region *reg, *nreg;
238
239    BUG_ON(!list_empty(&rh->quiesced_regions));
240    for (h = 0; h < rh->nr_buckets; h++) {
241        list_for_each_entry_safe(reg, nreg, rh->buckets + h,
242                     hash_list) {
243            BUG_ON(atomic_read(&reg->pending));
244            mempool_free(reg, rh->region_pool);
245        }
246    }
247
248    if (rh->log)
249        dm_dirty_log_destroy(rh->log);
250
251    if (rh->region_pool)
252        mempool_destroy(rh->region_pool);
253
254    vfree(rh->buckets);
255    kfree(rh);
256}
257EXPORT_SYMBOL_GPL(dm_region_hash_destroy);
258
259struct dm_dirty_log *dm_rh_dirty_log(struct dm_region_hash *rh)
260{
261    return rh->log;
262}
263EXPORT_SYMBOL_GPL(dm_rh_dirty_log);
264
265static unsigned rh_hash(struct dm_region_hash *rh, region_t region)
266{
267    return (unsigned) ((region * rh->prime) >> rh->shift) & rh->mask;
268}
269
270static struct dm_region *__rh_lookup(struct dm_region_hash *rh, region_t region)
271{
272    struct dm_region *reg;
273    struct list_head *bucket = rh->buckets + rh_hash(rh, region);
274
275    list_for_each_entry(reg, bucket, hash_list)
276        if (reg->key == region)
277            return reg;
278
279    return NULL;
280}
281
282static void __rh_insert(struct dm_region_hash *rh, struct dm_region *reg)
283{
284    list_add(&reg->hash_list, rh->buckets + rh_hash(rh, reg->key));
285}
286
287static struct dm_region *__rh_alloc(struct dm_region_hash *rh, region_t region)
288{
289    struct dm_region *reg, *nreg;
290
291    nreg = mempool_alloc(rh->region_pool, GFP_ATOMIC);
292    if (unlikely(!nreg))
293        nreg = kmalloc(sizeof(*nreg), GFP_NOIO | __GFP_NOFAIL);
294
295    nreg->state = rh->log->type->in_sync(rh->log, region, 1) ?
296              DM_RH_CLEAN : DM_RH_NOSYNC;
297    nreg->rh = rh;
298    nreg->key = region;
299    INIT_LIST_HEAD(&nreg->list);
300    atomic_set(&nreg->pending, 0);
301    bio_list_init(&nreg->delayed_bios);
302
303    write_lock_irq(&rh->hash_lock);
304    reg = __rh_lookup(rh, region);
305    if (reg)
306        /* We lost the race. */
307        mempool_free(nreg, rh->region_pool);
308    else {
309        __rh_insert(rh, nreg);
310        if (nreg->state == DM_RH_CLEAN) {
311            spin_lock(&rh->region_lock);
312            list_add(&nreg->list, &rh->clean_regions);
313            spin_unlock(&rh->region_lock);
314        }
315
316        reg = nreg;
317    }
318    write_unlock_irq(&rh->hash_lock);
319
320    return reg;
321}
322
323static struct dm_region *__rh_find(struct dm_region_hash *rh, region_t region)
324{
325    struct dm_region *reg;
326
327    reg = __rh_lookup(rh, region);
328    if (!reg) {
329        read_unlock(&rh->hash_lock);
330        reg = __rh_alloc(rh, region);
331        read_lock(&rh->hash_lock);
332    }
333
334    return reg;
335}
336
337int dm_rh_get_state(struct dm_region_hash *rh, region_t region, int may_block)
338{
339    int r;
340    struct dm_region *reg;
341
342    read_lock(&rh->hash_lock);
343    reg = __rh_lookup(rh, region);
344    read_unlock(&rh->hash_lock);
345
346    if (reg)
347        return reg->state;
348
349    /*
350     * The region wasn't in the hash, so we fall back to the
351     * dirty log.
352     */
353    r = rh->log->type->in_sync(rh->log, region, may_block);
354
355    /*
356     * Any error from the dirty log (eg. -EWOULDBLOCK) gets
357     * taken as a DM_RH_NOSYNC
358     */
359    return r == 1 ? DM_RH_CLEAN : DM_RH_NOSYNC;
360}
361EXPORT_SYMBOL_GPL(dm_rh_get_state);
362
363static void complete_resync_work(struct dm_region *reg, int success)
364{
365    struct dm_region_hash *rh = reg->rh;
366
367    rh->log->type->set_region_sync(rh->log, reg->key, success);
368
369    /*
370     * Dispatch the bios before we call 'wake_up_all'.
371     * This is important because if we are suspending,
372     * we want to know that recovery is complete and
373     * the work queue is flushed. If we wake_up_all
374     * before we dispatch_bios (queue bios and call wake()),
375     * then we risk suspending before the work queue
376     * has been properly flushed.
377     */
378    rh->dispatch_bios(rh->context, &reg->delayed_bios);
379    if (atomic_dec_and_test(&rh->recovery_in_flight))
380        rh->wakeup_all_recovery_waiters(rh->context);
381    up(&rh->recovery_count);
382}
383
384/* dm_rh_mark_nosync
385 * @ms
386 * @bio
387 *
388 * The bio was written on some mirror(s) but failed on other mirror(s).
389 * We can successfully endio the bio but should avoid the region being
390 * marked clean by setting the state DM_RH_NOSYNC.
391 *
392 * This function is _not_ safe in interrupt context!
393 */
394void dm_rh_mark_nosync(struct dm_region_hash *rh, struct bio *bio)
395{
396    unsigned long flags;
397    struct dm_dirty_log *log = rh->log;
398    struct dm_region *reg;
399    region_t region = dm_rh_bio_to_region(rh, bio);
400    int recovering = 0;
401
402    if (bio->bi_rw & REQ_FLUSH) {
403        rh->flush_failure = 1;
404        return;
405    }
406
407    if (bio->bi_rw & REQ_DISCARD)
408        return;
409
410    /* We must inform the log that the sync count has changed. */
411    log->type->set_region_sync(log, region, 0);
412
413    read_lock(&rh->hash_lock);
414    reg = __rh_find(rh, region);
415    read_unlock(&rh->hash_lock);
416
417    /* region hash entry should exist because write was in-flight */
418    BUG_ON(!reg);
419    BUG_ON(!list_empty(&reg->list));
420
421    spin_lock_irqsave(&rh->region_lock, flags);
422    /*
423     * Possible cases:
424     * 1) DM_RH_DIRTY
425     * 2) DM_RH_NOSYNC: was dirty, other preceding writes failed
426     * 3) DM_RH_RECOVERING: flushing pending writes
427     * Either case, the region should have not been connected to list.
428     */
429    recovering = (reg->state == DM_RH_RECOVERING);
430    reg->state = DM_RH_NOSYNC;
431    BUG_ON(!list_empty(&reg->list));
432    spin_unlock_irqrestore(&rh->region_lock, flags);
433
434    if (recovering)
435        complete_resync_work(reg, 0);
436}
437EXPORT_SYMBOL_GPL(dm_rh_mark_nosync);
438
439void dm_rh_update_states(struct dm_region_hash *rh, int errors_handled)
440{
441    struct dm_region *reg, *next;
442
443    LIST_HEAD(clean);
444    LIST_HEAD(recovered);
445    LIST_HEAD(failed_recovered);
446
447    /*
448     * Quickly grab the lists.
449     */
450    write_lock_irq(&rh->hash_lock);
451    spin_lock(&rh->region_lock);
452    if (!list_empty(&rh->clean_regions)) {
453        list_splice_init(&rh->clean_regions, &clean);
454
455        list_for_each_entry(reg, &clean, list)
456            list_del(&reg->hash_list);
457    }
458
459    if (!list_empty(&rh->recovered_regions)) {
460        list_splice_init(&rh->recovered_regions, &recovered);
461
462        list_for_each_entry(reg, &recovered, list)
463            list_del(&reg->hash_list);
464    }
465
466    if (!list_empty(&rh->failed_recovered_regions)) {
467        list_splice_init(&rh->failed_recovered_regions,
468                 &failed_recovered);
469
470        list_for_each_entry(reg, &failed_recovered, list)
471            list_del(&reg->hash_list);
472    }
473
474    spin_unlock(&rh->region_lock);
475    write_unlock_irq(&rh->hash_lock);
476
477    /*
478     * All the regions on the recovered and clean lists have
479     * now been pulled out of the system, so no need to do
480     * any more locking.
481     */
482    list_for_each_entry_safe(reg, next, &recovered, list) {
483        rh->log->type->clear_region(rh->log, reg->key);
484        complete_resync_work(reg, 1);
485        mempool_free(reg, rh->region_pool);
486    }
487
488    list_for_each_entry_safe(reg, next, &failed_recovered, list) {
489        complete_resync_work(reg, errors_handled ? 0 : 1);
490        mempool_free(reg, rh->region_pool);
491    }
492
493    list_for_each_entry_safe(reg, next, &clean, list) {
494        rh->log->type->clear_region(rh->log, reg->key);
495        mempool_free(reg, rh->region_pool);
496    }
497
498    rh->log->type->flush(rh->log);
499}
500EXPORT_SYMBOL_GPL(dm_rh_update_states);
501
502static void rh_inc(struct dm_region_hash *rh, region_t region)
503{
504    struct dm_region *reg;
505
506    read_lock(&rh->hash_lock);
507    reg = __rh_find(rh, region);
508
509    spin_lock_irq(&rh->region_lock);
510    atomic_inc(&reg->pending);
511
512    if (reg->state == DM_RH_CLEAN) {
513        reg->state = DM_RH_DIRTY;
514        list_del_init(&reg->list); /* take off the clean list */
515        spin_unlock_irq(&rh->region_lock);
516
517        rh->log->type->mark_region(rh->log, reg->key);
518    } else
519        spin_unlock_irq(&rh->region_lock);
520
521
522    read_unlock(&rh->hash_lock);
523}
524
525void dm_rh_inc_pending(struct dm_region_hash *rh, struct bio_list *bios)
526{
527    struct bio *bio;
528
529    for (bio = bios->head; bio; bio = bio->bi_next) {
530        if (bio->bi_rw & (REQ_FLUSH | REQ_DISCARD))
531            continue;
532        rh_inc(rh, dm_rh_bio_to_region(rh, bio));
533    }
534}
535EXPORT_SYMBOL_GPL(dm_rh_inc_pending);
536
537void dm_rh_dec(struct dm_region_hash *rh, region_t region)
538{
539    unsigned long flags;
540    struct dm_region *reg;
541    int should_wake = 0;
542
543    read_lock(&rh->hash_lock);
544    reg = __rh_lookup(rh, region);
545    read_unlock(&rh->hash_lock);
546
547    spin_lock_irqsave(&rh->region_lock, flags);
548    if (atomic_dec_and_test(&reg->pending)) {
549        /*
550         * There is no pending I/O for this region.
551         * We can move the region to corresponding list for next action.
552         * At this point, the region is not yet connected to any list.
553         *
554         * If the state is DM_RH_NOSYNC, the region should be kept off
555         * from clean list.
556         * The hash entry for DM_RH_NOSYNC will remain in memory
557         * until the region is recovered or the map is reloaded.
558         */
559
560        /* do nothing for DM_RH_NOSYNC */
561        if (unlikely(rh->flush_failure)) {
562            /*
563             * If a write flush failed some time ago, we
564             * don't know whether or not this write made it
565             * to the disk, so we must resync the device.
566             */
567            reg->state = DM_RH_NOSYNC;
568        } else if (reg->state == DM_RH_RECOVERING) {
569            list_add_tail(&reg->list, &rh->quiesced_regions);
570        } else if (reg->state == DM_RH_DIRTY) {
571            reg->state = DM_RH_CLEAN;
572            list_add(&reg->list, &rh->clean_regions);
573        }
574        should_wake = 1;
575    }
576    spin_unlock_irqrestore(&rh->region_lock, flags);
577
578    if (should_wake)
579        rh->wakeup_workers(rh->context);
580}
581EXPORT_SYMBOL_GPL(dm_rh_dec);
582
583/*
584 * Starts quiescing a region in preparation for recovery.
585 */
586static int __rh_recovery_prepare(struct dm_region_hash *rh)
587{
588    int r;
589    region_t region;
590    struct dm_region *reg;
591
592    /*
593     * Ask the dirty log what's next.
594     */
595    r = rh->log->type->get_resync_work(rh->log, &region);
596    if (r <= 0)
597        return r;
598
599    /*
600     * Get this region, and start it quiescing by setting the
601     * recovering flag.
602     */
603    read_lock(&rh->hash_lock);
604    reg = __rh_find(rh, region);
605    read_unlock(&rh->hash_lock);
606
607    spin_lock_irq(&rh->region_lock);
608    reg->state = DM_RH_RECOVERING;
609
610    /* Already quiesced ? */
611    if (atomic_read(&reg->pending))
612        list_del_init(&reg->list);
613    else
614        list_move(&reg->list, &rh->quiesced_regions);
615
616    spin_unlock_irq(&rh->region_lock);
617
618    return 1;
619}
620
621void dm_rh_recovery_prepare(struct dm_region_hash *rh)
622{
623    /* Extra reference to avoid race with dm_rh_stop_recovery */
624    atomic_inc(&rh->recovery_in_flight);
625
626    while (!down_trylock(&rh->recovery_count)) {
627        atomic_inc(&rh->recovery_in_flight);
628        if (__rh_recovery_prepare(rh) <= 0) {
629            atomic_dec(&rh->recovery_in_flight);
630            up(&rh->recovery_count);
631            break;
632        }
633    }
634
635    /* Drop the extra reference */
636    if (atomic_dec_and_test(&rh->recovery_in_flight))
637        rh->wakeup_all_recovery_waiters(rh->context);
638}
639EXPORT_SYMBOL_GPL(dm_rh_recovery_prepare);
640
641/*
642 * Returns any quiesced regions.
643 */
644struct dm_region *dm_rh_recovery_start(struct dm_region_hash *rh)
645{
646    struct dm_region *reg = NULL;
647
648    spin_lock_irq(&rh->region_lock);
649    if (!list_empty(&rh->quiesced_regions)) {
650        reg = list_entry(rh->quiesced_regions.next,
651                 struct dm_region, list);
652        list_del_init(&reg->list); /* remove from the quiesced list */
653    }
654    spin_unlock_irq(&rh->region_lock);
655
656    return reg;
657}
658EXPORT_SYMBOL_GPL(dm_rh_recovery_start);
659
660void dm_rh_recovery_end(struct dm_region *reg, int success)
661{
662    struct dm_region_hash *rh = reg->rh;
663
664    spin_lock_irq(&rh->region_lock);
665    if (success)
666        list_add(&reg->list, &reg->rh->recovered_regions);
667    else
668        list_add(&reg->list, &reg->rh->failed_recovered_regions);
669
670    spin_unlock_irq(&rh->region_lock);
671
672    rh->wakeup_workers(rh->context);
673}
674EXPORT_SYMBOL_GPL(dm_rh_recovery_end);
675
676/* Return recovery in flight count. */
677int dm_rh_recovery_in_flight(struct dm_region_hash *rh)
678{
679    return atomic_read(&rh->recovery_in_flight);
680}
681EXPORT_SYMBOL_GPL(dm_rh_recovery_in_flight);
682
683int dm_rh_flush(struct dm_region_hash *rh)
684{
685    return rh->log->type->flush(rh->log);
686}
687EXPORT_SYMBOL_GPL(dm_rh_flush);
688
689void dm_rh_delay(struct dm_region_hash *rh, struct bio *bio)
690{
691    struct dm_region *reg;
692
693    read_lock(&rh->hash_lock);
694    reg = __rh_find(rh, dm_rh_bio_to_region(rh, bio));
695    bio_list_add(&reg->delayed_bios, bio);
696    read_unlock(&rh->hash_lock);
697}
698EXPORT_SYMBOL_GPL(dm_rh_delay);
699
700void dm_rh_stop_recovery(struct dm_region_hash *rh)
701{
702    int i;
703
704    /* wait for any recovering regions */
705    for (i = 0; i < rh->max_recovery; i++)
706        down(&rh->recovery_count);
707}
708EXPORT_SYMBOL_GPL(dm_rh_stop_recovery);
709
710void dm_rh_start_recovery(struct dm_region_hash *rh)
711{
712    int i;
713
714    for (i = 0; i < rh->max_recovery; i++)
715        up(&rh->recovery_count);
716
717    rh->wakeup_workers(rh->context);
718}
719EXPORT_SYMBOL_GPL(dm_rh_start_recovery);
720
721MODULE_DESCRIPTION(DM_NAME " region hash");
722MODULE_AUTHOR("Joe Thornber/Heinz Mauelshagen <dm-devel@redhat.com>");
723MODULE_LICENSE("GPL");
724

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