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[PATCH] dm: fix rh_dec()/rh_inc() race in dm-raid1.c 

Fix another bug in dm-raid1.c that the dirty region may stay in or be moved
to clean list and freed while in use.

It happens as follows:

   CPU0                                   CPU1
   ------------------------------------------------------------------------------
   rh_dec()
     if (atomic_dec_and_test(pending))
        <the region is still marked dirty>
                                          rh_inc()
                                            if the region is clean
                                               mark the region dirty
                                               and remove from clean list
        mark the region clean
        and move to clean list
                                                  atomic_inc(pending)

At this stage, the region is in clean list and will be mistakenly reclaimed
by rh_update_states() later.

Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Jun'ichi Nomura 2005-09-09 16:23:42 -07:00 committed by Linus Torvalds
parent e5dcdd80a6
commit 844e8d904a
1 changed files with 9 additions and 3 deletions
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12
drivers/md/dm-raid1.c
View File

@ -375,16 +375,18 @@ static void rh_inc(struct region_hash *rh, region_t region)
read_lock(&rh->hash_lock);
reg = __rh_find(rh, region);
atomic_inc(&reg->pending);
spin_lock_irq(&rh->region_lock);
if (reg->state == RH_CLEAN) {
rh->log->type->mark_region(rh->log, reg->key);
spin_lock_irq(&rh->region_lock);
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);
atomic_inc(&reg->pending);
read_unlock(&rh->hash_lock);
}
@ -408,6 +410,10 @@ static void rh_dec(struct region_hash *rh, region_t region)
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 {