Merge git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6

[mv-sheeva.git] / drivers / md / dm.c

diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index fe7c56e104359ce95ce8b34143542535d030c78c..2717a355dc5bf6847243de88f78fd540da5e941b 100644 (file)
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1012,7 +1012,7 @@ static struct mapped_device *alloc_dev(int minor)
        if (!md->tio_pool)
                goto bad3;
 
-       md->bs = bioset_create(16, 16, 4);
+       md->bs = bioset_create(16, 16);
        if (!md->bs)
                goto bad_no_bioset;
 
@@ -1116,7 +1116,8 @@ static int __bind(struct mapped_device *md, struct dm_table *t)
        if (size != get_capacity(md->disk))
                memset(&md->geometry, 0, sizeof(md->geometry));
 
-       __set_size(md, size);
+       if (md->suspended_bdev)
+               __set_size(md, size);
        if (size == 0)
                return 0;
 
@@ -1235,6 +1236,7 @@ void dm_put(struct mapped_device *md)
                free_dev(md);
        }
 }
+EXPORT_SYMBOL_GPL(dm_put);
 
 /*
  * Process the deferred bios
@@ -1264,6 +1266,11 @@ int dm_swap_table(struct mapped_device *md, struct dm_table *table)
        if (!dm_suspended(md))
                goto out;
 
+       /* without bdev, the device size cannot be changed */
+       if (!md->suspended_bdev)
+               if (get_capacity(md->disk) != dm_table_get_size(table))
+                       goto out;
+
        __unbind(md);
        r = __bind(md, table);
 
@@ -1341,11 +1348,14 @@ int dm_suspend(struct mapped_device *md, unsigned suspend_flags)
        /* This does not get reverted if there's an error later. */
        dm_table_presuspend_targets(map);
 
-       md->suspended_bdev = bdget_disk(md->disk, 0);
-       if (!md->suspended_bdev) {
-               DMWARN("bdget failed in dm_suspend");
-               r = -ENOMEM;
-               goto flush_and_out;
+       /* bdget() can stall if the pending I/Os are not flushed */
+       if (!noflush) {
+               md->suspended_bdev = bdget_disk(md->disk, 0);
+               if (!md->suspended_bdev) {
+                       DMWARN("bdget failed in dm_suspend");
+                       r = -ENOMEM;
+                       goto flush_and_out;
+               }
        }
 
        /*
@@ -1473,8 +1483,10 @@ int dm_resume(struct mapped_device *md)
 
        unlock_fs(md);
 
-       bdput(md->suspended_bdev);
-       md->suspended_bdev = NULL;
+       if (md->suspended_bdev) {
+               bdput(md->suspended_bdev);
+               md->suspended_bdev = NULL;
+       }
 
        clear_bit(DMF_SUSPENDED, &md->flags);