bitmap_create returns bitmap pointer
This is done to have multiple bitmaps open at the same time.
Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c
index b1d94ee..f02551f 100644
--- a/drivers/md/bitmap.c
+++ b/drivers/md/bitmap.c
@@ -553,7 +553,6 @@
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 @@
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 @@
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 @@
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 @@
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 @@
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 @@
* 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 @@
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 @@
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 @@
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 @@
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)