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Subject: [PATCH] Enable loading of bitmaps for dm-md-raid1.
This is also a temporary hack to systems with junk in the rest
of the bitmap super (instead of zeroes) to boot. This is done by
checking mddev->sync_super (which is exclusively set by dm-raid)
is null.
These changes also include zeroing of most bitmap pages while
allocating so we are sure that the junk is not coming from memory.
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
---
diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c
index 135a090..dfa5ef3 100644
--- a/drivers/md/bitmap.c
+++ b/drivers/md/bitmap.c
@@ -494,7 +494,7 @@ static int bitmap_new_disk_sb(struct bitmap *bitmap)
bitmap_super_t *sb;
unsigned long chunksize, daemon_sleep, write_behind;
- bitmap->storage.sb_page = alloc_page(GFP_KERNEL);
+ bitmap->storage.sb_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
if (bitmap->storage.sb_page == NULL)
return -ENOMEM;
bitmap->storage.sb_page->index = 0;
@@ -541,6 +541,7 @@ static int bitmap_new_disk_sb(struct bitmap *bitmap)
sb->state = cpu_to_le32(bitmap->flags);
bitmap->events_cleared = bitmap->mddev->events;
sb->events_cleared = cpu_to_le64(bitmap->mddev->events);
+ bitmap->mddev->bitmap_info.nodes = 0;
kunmap_atomic(sb);
@@ -568,7 +569,7 @@ static int bitmap_read_sb(struct bitmap *bitmap)
goto out_no_sb;
}
/* page 0 is the superblock, read it... */
- sb_page = alloc_page(GFP_KERNEL);
+ sb_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
if (!sb_page)
return -ENOMEM;
bitmap->storage.sb_page = sb_page;
@@ -611,8 +612,15 @@ re_read:
daemon_sleep = le32_to_cpu(sb->daemon_sleep) * HZ;
write_behind = le32_to_cpu(sb->write_behind);
sectors_reserved = le32_to_cpu(sb->sectors_reserved);
- nodes = le32_to_cpu(sb->nodes);
- strlcpy(bitmap->mddev->bitmap_info.cluster_name, sb->cluster_name, 64);
+ /* XXX: This is an ugly hack to ensure that we don't use clustering
+ in case dm-raid is in use and the nodes written in bitmap_sb
+ is erroneous.
+ */
+ if (!bitmap->mddev->sync_super) {
+ nodes = le32_to_cpu(sb->nodes);
+ strlcpy(bitmap->mddev->bitmap_info.cluster_name,
+ sb->cluster_name, 64);
+ }
/* verify that the bitmap-specific fields are valid */
if (sb->magic != cpu_to_le32(BITMAP_MAGIC))
@@ -649,7 +657,7 @@ re_read:
goto out;
}
events = le64_to_cpu(sb->events);
- if (!nodes && (events < bitmap->mddev->events)) {
+ if (err == 0 && !nodes && (events < bitmap->mddev->events)) {
printk(KERN_INFO
"%s: bitmap file is out of date (%llu < %llu) "
"-- forcing full recovery\n",
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 4dbed4a..6bd8bc3 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -7415,7 +7415,7 @@ int md_setup_cluster(struct mddev *mddev, int nodes)
err = request_module("md-cluster");
if (err) {
pr_err("md-cluster module not found.\n");
- return err;
+ return -ENOENT;
}
spin_lock(&pers_lock);
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