[PATCH] make dm-mirror not issue invalid resync requests

[pandora-kernel.git] / drivers / md / dm-raid1.c

diff --git a/drivers/md/dm-raid1.c b/drivers/md/dm-raid1.c
index 2375709..6cfa8d4 100644 (file)
--- a/drivers/md/dm-raid1.c
+++ b/drivers/md/dm-raid1.c
@@ -376,16 +376,18 @@ static void rh_inc(struct region_hash *rh, region_t region)
        read_lock(&rh->hash_lock);
        reg = __rh_find(rh, region);
 
+       spin_lock_irq(&rh->region_lock);
        atomic_inc(&reg->pending);
 
-       spin_lock_irq(&rh->region_lock);
        if (reg->state == RH_CLEAN) {
-               rh->log->type->mark_region(rh->log, reg->key);
-
                reg->state = RH_DIRTY;
                list_del_init(&reg->list);      /* take off the clean list */
-       }
-       spin_unlock_irq(&rh->region_lock);
+               spin_unlock_irq(&rh->region_lock);
+
+               rh->log->type->mark_region(rh->log, reg->key);
+       } else
+               spin_unlock_irq(&rh->region_lock);
+
 
        read_unlock(&rh->hash_lock);
 }
@@ -408,21 +410,17 @@ static void rh_dec(struct region_hash *rh, region_t region)
        reg = __rh_lookup(rh, region);
        read_unlock(&rh->hash_lock);
 
+       spin_lock_irqsave(&rh->region_lock, flags);
        if (atomic_dec_and_test(&reg->pending)) {
-               spin_lock_irqsave(&rh->region_lock, flags);
-               if (atomic_read(&reg->pending)) { /* check race */
-                       spin_unlock_irqrestore(&rh->region_lock, flags);
-                       return;
-               }
                if (reg->state == RH_RECOVERING) {
                        list_add_tail(&reg->list, &rh->quiesced_regions);
                } else {
                        reg->state = RH_CLEAN;
                        list_add(&reg->list, &rh->clean_regions);
                }
-               spin_unlock_irqrestore(&rh->region_lock, flags);
                should_wake = 1;
        }
+       spin_unlock_irqrestore(&rh->region_lock, flags);
 
        if (should_wake)
                wake();
@@ -564,6 +562,8 @@ struct mirror_set {
        region_t nr_regions;
        int in_sync;
 
+       struct mirror *default_mirror;  /* Default mirror */
+
        unsigned int nr_mirrors;
        struct mirror mirror[0];
 };
@@ -613,7 +613,7 @@ static int recover(struct mirror_set *ms, struct region *reg)
        unsigned long flags = 0;
 
        /* fill in the source */
-       m = ms->mirror + DEFAULT_MIRROR;
+       m = ms->default_mirror;
        from.bdev = m->dev->bdev;
        from.sector = m->offset + region_to_sector(reg->rh, reg->key);
        if (reg->key == (ms->nr_regions - 1)) {
@@ -629,7 +629,7 @@ static int recover(struct mirror_set *ms, struct region *reg)
 
        /* fill in the destinations */
        for (i = 0, dest = to; i < ms->nr_mirrors; i++) {
-               if (i == DEFAULT_MIRROR)
+               if (&ms->mirror[i] == ms->default_mirror)
                        continue;
 
                m = ms->mirror + i;
@@ -684,7 +684,7 @@ static void do_recovery(struct mirror_set *ms)
 static struct mirror *choose_mirror(struct mirror_set *ms, sector_t sector)
 {
        /* FIXME: add read balancing */
-       return ms->mirror + DEFAULT_MIRROR;
+       return ms->default_mirror;
 }
 
 /*
@@ -711,7 +711,7 @@ static void do_reads(struct mirror_set *ms, struct bio_list *reads)
                if (rh_in_sync(&ms->rh, region, 0))
                        m = choose_mirror(ms, bio->bi_sector);
                else
-                       m = ms->mirror + DEFAULT_MIRROR;
+                       m = ms->default_mirror;
 
                map_bio(ms, m, bio);
                generic_make_request(bio);
@@ -835,7 +835,7 @@ static void do_writes(struct mirror_set *ms, struct bio_list *writes)
                rh_delay(&ms->rh, bio);
 
        while ((bio = bio_list_pop(&nosync))) {
-               map_bio(ms, ms->mirror + DEFAULT_MIRROR, bio);
+               map_bio(ms, ms->default_mirror, bio);
                generic_make_request(bio);
        }
 }
@@ -902,6 +902,7 @@ static struct mirror_set *alloc_context(unsigned int nr_mirrors,
        ms->nr_mirrors = nr_mirrors;
        ms->nr_regions = dm_sector_div_up(ti->len, region_size);
        ms->in_sync = 0;
+       ms->default_mirror = &ms->mirror[DEFAULT_MIRROR];
 
        if (rh_init(&ms->rh, ms, dl, region_size, ms->nr_regions)) {
                ti->error = "dm-mirror: Error creating dirty region hash";