1 files changed, 36 insertions, 24 deletions

diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c
index b1d94eee3346..f02551f50bb5 100644
--- a/drivers/md/bitmap.c
+++ b/drivers/md/bitmap.c
@@ -553,7 +553,6 @@ static int bitmap_read_sb(struct bitmap *bitmap)
         unsigned long sectors_reserved = 0;
         int err = -EINVAL;
         struct page *sb_page;
-        int cluster_setup_done = 0;
 
         if (!bitmap->storage.file && !bitmap->mddev->bitmap_info.offset) {
                 chunksize = 128 * 1024 * 1024;
@@ -570,6 +569,18 @@ static int bitmap_read_sb(struct bitmap *bitmap)
         bitmap->storage.sb_page = sb_page;
 
 re_read:
+        /* If cluster_slot is set, the cluster is setup */
+        if (bitmap->cluster_slot >= 0) {
+                long long bm_blocks;
+
+                bm_blocks = bitmap->mddev->resync_max_sectors / (bitmap->mddev->bitmap_info.chunksize >> 9);
+                bm_blocks = bm_blocks << 3;
+                bm_blocks = DIV_ROUND_UP(bm_blocks, 4096);
+                bitmap->mddev->bitmap_info.offset += bitmap->cluster_slot * (bm_blocks << 3);
+                pr_info("%s:%d bm slot: %d offset: %llu\n", __func__, __LINE__,
+                        bitmap->cluster_slot, (unsigned long long)bitmap->mddev->bitmap_info.offset);
+        }
+
         if (bitmap->storage.file) {
                 loff_t isize = i_size_read(bitmap->storage.file->f_mapping->host);
                 int bytes = isize > PAGE_SIZE ? PAGE_SIZE : isize;
@@ -650,14 +661,9 @@ re_read:
 
 out:
         kunmap_atomic(sb);
-        if (nodes && !cluster_setup_done) {
-                sector_t bm_blocks;
-
-                bm_blocks = sector_div(bitmap->mddev->resync_max_sectors, (chunksize >> 9));
-                bm_blocks = bm_blocks << 3;
-                /* We have bitmap supers at 4k boundaries, hence this
-                 * is hardcoded */
-                bm_blocks = DIV_ROUND_UP(bm_blocks, 4096);
+        /* Assiging chunksize is required for "re_read" */
+        bitmap->mddev->bitmap_info.chunksize = chunksize;
+        if (nodes && (bitmap->cluster_slot < 0)) {
                 err = md_setup_cluster(bitmap->mddev, nodes);
                 if (err) {
                         pr_err("%s: Could not setup cluster service (%d)\n",
@@ -665,12 +671,9 @@ out:
                         goto out_no_sb;
                 }
                 bitmap->cluster_slot = md_cluster_ops->slot_number(bitmap->mddev);
-                bitmap->mddev->bitmap_info.offset +=
-                        bitmap->cluster_slot * (bm_blocks << 3);
                 pr_info("%s:%d bm slot: %d offset: %llu\n", __func__, __LINE__,
                         bitmap->cluster_slot,
                         (unsigned long long)bitmap->mddev->bitmap_info.offset);
-                cluster_setup_done = 1;
                 goto re_read;
         }
 
@@ -687,7 +690,7 @@ out_no_sb:
                 bitmap->mddev->bitmap_info.space = sectors_reserved;
         if (err) {
                 bitmap_print_sb(bitmap);
-                if (cluster_setup_done)
+                if (bitmap->cluster_slot < 0)
                         md_cluster_stop(bitmap->mddev);
         }
         return err;
@@ -1639,7 +1642,8 @@ static void bitmap_free(struct bitmap *bitmap)
         if (!bitmap) /* there was no bitmap */
                 return;
 
-        if (mddev_is_clustered(bitmap->mddev) && bitmap->mddev->cluster_info)
+        if (mddev_is_clustered(bitmap->mddev) && bitmap->mddev->cluster_info &&
+                bitmap->cluster_slot == md_cluster_ops->slot_number(bitmap->mddev))
                 md_cluster_stop(bitmap->mddev);
 
         /* Shouldn't be needed - but just in case.... */
@@ -1687,7 +1691,7 @@ void bitmap_destroy(struct mddev *mddev)
  * initialize the bitmap structure
  * if this returns an error, bitmap_destroy must be called to do clean up
  */
-int bitmap_create(struct mddev *mddev)
+struct bitmap *bitmap_create(struct mddev *mddev, int slot)
 {
         struct bitmap *bitmap;
         sector_t blocks = mddev->resync_max_sectors;
@@ -1701,7 +1705,7 @@ int bitmap_create(struct mddev *mddev)
 
         bitmap = kzalloc(sizeof(*bitmap), GFP_KERNEL);
         if (!bitmap)
-                return -ENOMEM;
+                return ERR_PTR(-ENOMEM);
 
         spin_lock_init(&bitmap->counts.lock);
         atomic_set(&bitmap->pending_writes, 0);
@@ -1710,6 +1714,7 @@ int bitmap_create(struct mddev *mddev)
         init_waitqueue_head(&bitmap->behind_wait);
 
         bitmap->mddev = mddev;
+        bitmap->cluster_slot = slot;
 
         if (mddev->kobj.sd)
                 bm = sysfs_get_dirent(mddev->kobj.sd, "bitmap");
@@ -1757,12 +1762,14 @@ int bitmap_create(struct mddev *mddev)
         printk(KERN_INFO "created bitmap (%lu pages) for device %s\n",
                bitmap->counts.pages, bmname(bitmap));
 
-        mddev->bitmap = bitmap;
-        return test_bit(BITMAP_WRITE_ERROR, &bitmap->flags) ? -EIO : 0;
+        err = test_bit(BITMAP_WRITE_ERROR, &bitmap->flags) ? -EIO : 0;
+        if (err)
+                goto error;
 
+        return bitmap;
  error:
         bitmap_free(bitmap);
-        return err;
+        return ERR_PTR(err);
 }
 
 int bitmap_load(struct mddev *mddev)
@@ -2073,13 +2080,18 @@ location_store(struct mddev *mddev, const char *buf, size_t len)
                                 return -EINVAL;
                         mddev->bitmap_info.offset = offset;
                         if (mddev->pers) {
+                                struct bitmap *bitmap;
                                 mddev->pers->quiesce(mddev, 1);
-                                rv = bitmap_create(mddev);
-                                if (!rv)
+                                bitmap = bitmap_create(mddev, -1);
+                                if (IS_ERR(bitmap))
+                                        rv = PTR_ERR(bitmap);
+                                else {
+                                        mddev->bitmap = bitmap;
                                         rv = bitmap_load(mddev);
-                                if (rv) {
-                                        bitmap_destroy(mddev);
-                                        mddev->bitmap_info.offset = 0;
+                                        if (rv) {
+                                                bitmap_destroy(mddev);
+                                                mddev->bitmap_info.offset = 0;
+                                        }
                                 }
                                 mddev->pers->quiesce(mddev, 0);
                                 if (rv)