Merge branch 'imx-for-2.6.38' of git://git.pengutronix.de/git/ukl/linux-2.6 into...

[pandora-kernel.git] / drivers / block / drbd / drbd_actlog.c

diff --git a/drivers/block/drbd/drbd_actlog.c b/drivers/block/drbd/drbd_actlog.c
index ac04ef9..ba95cba 100644 (file)
--- a/drivers/block/drbd/drbd_actlog.c
+++ b/drivers/block/drbd/drbd_actlog.c
@@ -78,11 +78,10 @@ static int _drbd_md_sync_page_io(struct drbd_conf *mdev,
        init_completion(&md_io.event);
        md_io.error = 0;
 
-       if ((rw & WRITE) && !test_bit(MD_NO_BARRIER, &mdev->flags))
-               rw |= REQ_HARDBARRIER;
+       if ((rw & WRITE) && !test_bit(MD_NO_FUA, &mdev->flags))
+               rw |= REQ_FUA;
        rw |= REQ_UNPLUG | REQ_SYNC;
 
- retry:
        bio = bio_alloc(GFP_NOIO, 1);
        bio->bi_bdev = bdev->md_bdev;
        bio->bi_sector = sector;
@@ -100,17 +99,6 @@ static int _drbd_md_sync_page_io(struct drbd_conf *mdev,
        wait_for_completion(&md_io.event);
        ok = bio_flagged(bio, BIO_UPTODATE) && md_io.error == 0;
 
-       /* check for unsupported barrier op.
-        * would rather check on EOPNOTSUPP, but that is not reliable.
-        * don't try again for ANY return value != 0 */
-       if (unlikely((bio->bi_rw & REQ_HARDBARRIER) && !ok)) {
-               /* Try again with no barrier */
-               dev_warn(DEV, "Barriers not supported on meta data device - disabling\n");
-               set_bit(MD_NO_BARRIER, &mdev->flags);
-               rw &= ~REQ_HARDBARRIER;
-               bio_put(bio);
-               goto retry;
-       }
  out:
        bio_put(bio);
        return ok;
@@ -284,18 +272,32 @@ w_al_write_transaction(struct drbd_conf *mdev, struct drbd_work *w, int unused)
        u32 xor_sum = 0;
 
        if (!get_ldev(mdev)) {
-               dev_err(DEV, "get_ldev() failed in w_al_write_transaction\n");
+               dev_err(DEV,
+                       "disk is %s, cannot start al transaction (-%d +%d)\n",
+                       drbd_disk_str(mdev->state.disk), evicted, new_enr);
                complete(&((struct update_al_work *)w)->event);
                return 1;
        }
        /* do we have to do a bitmap write, first?
         * TODO reduce maximum latency:
         * submit both bios, then wait for both,
-        * instead of doing two synchronous sector writes. */
+        * instead of doing two synchronous sector writes.
+        * For now, we must not write the transaction,
+        * if we cannot write out the bitmap of the evicted extent. */
        if (mdev->state.conn < C_CONNECTED && evicted != LC_FREE)
                drbd_bm_write_sect(mdev, evicted/AL_EXT_PER_BM_SECT);
 
-       mutex_lock(&mdev->md_io_mutex); /* protects md_io_page, al_tr_cycle, ... */
+       /* The bitmap write may have failed, causing a state change. */
+       if (mdev->state.disk < D_INCONSISTENT) {
+               dev_err(DEV,
+                       "disk is %s, cannot write al transaction (-%d +%d)\n",
+                       drbd_disk_str(mdev->state.disk), evicted, new_enr);
+               complete(&((struct update_al_work *)w)->event);
+               put_ldev(mdev);
+               return 1;
+       }
+
+       mutex_lock(&mdev->md_io_mutex); /* protects md_io_buffer, al_tr_cycle, ... */
        buffer = (struct al_transaction *)page_address(mdev->md_io_page);
 
        buffer->magic = __constant_cpu_to_be32(DRBD_MAGIC);
@@ -739,7 +741,7 @@ void drbd_al_apply_to_bm(struct drbd_conf *mdev)
        unsigned int enr;
        unsigned long add = 0;
        char ppb[10];
-       int i;
+       int i, tmp;
 
        wait_event(mdev->al_wait, lc_try_lock(mdev->act_log));
 
@@ -747,7 +749,9 @@ void drbd_al_apply_to_bm(struct drbd_conf *mdev)
                enr = lc_element_by_index(mdev->act_log, i)->lc_number;
                if (enr == LC_FREE)
                        continue;
-               add += drbd_bm_ALe_set_all(mdev, enr);
+               tmp = drbd_bm_ALe_set_all(mdev, enr);
+               dynamic_dev_dbg(DEV, "AL: set %d bits in extent %u\n", tmp, enr);
+               add += tmp;
        }
 
        lc_unlock(mdev->act_log);