diff options
| author | Shaohua Li <shli@kernel.org> | 2012-07-03 15:57:19 +1000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-07-16 08:47:51 -0700 |
| commit | 457ef719563ead5f78cbb2a6394468e2237436b2 (patch) | |
| tree | 84517ca4142fa95463f878f36de2378ee427d9f7 /drivers | |
| parent | df5d64692d422f7df2e3221a95408b4ccf520fd0 (diff) | |
| download | lwn-457ef719563ead5f78cbb2a6394468e2237436b2.tar.gz lwn-457ef719563ead5f78cbb2a6394468e2237436b2.zip | |
raid5: delayed stripe fix
commit fab363b5ff502d1b39ddcfec04271f5858d9f26e upstream.
There isn't locking setting STRIPE_DELAYED and STRIPE_PREREAD_ACTIVE bits, but
the two bits have relationship. A delayed stripe can be moved to hold list only
when preread active stripe count is below IO_THRESHOLD. If a stripe has both
the bits set, such stripe will be in delayed list and preread count not 0,
which will make such stripe never leave delayed list.
Signed-off-by: Shaohua Li <shli@fusionio.com>
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/md/raid5.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 1f6c68df6f38..d0c8a1e1633a 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -199,12 +199,14 @@ static void __release_stripe(raid5_conf_t *conf, struct stripe_head *sh) BUG_ON(!list_empty(&sh->lru)); BUG_ON(atomic_read(&conf->active_stripes)==0); if (test_bit(STRIPE_HANDLE, &sh->state)) { - if (test_bit(STRIPE_DELAYED, &sh->state)) + if (test_bit(STRIPE_DELAYED, &sh->state) && + !test_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) list_add_tail(&sh->lru, &conf->delayed_list); else if (test_bit(STRIPE_BIT_DELAY, &sh->state) && sh->bm_seq - conf->seq_write > 0) list_add_tail(&sh->lru, &conf->bitmap_list); else { + clear_bit(STRIPE_DELAYED, &sh->state); clear_bit(STRIPE_BIT_DELAY, &sh->state); list_add_tail(&sh->lru, &conf->handle_list); } |