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Message-Id: <20250524061320.370630-24-yukuai1@huaweicloud.com>
Date: Sat, 24 May 2025 14:13:20 +0800
From: Yu Kuai <yukuai1@...weicloud.com>
To: hch@....de,
xni@...hat.com,
colyli@...nel.org,
song@...nel.org,
yukuai3@...wei.com
Cc: linux-doc@...r.kernel.org,
linux-kernel@...r.kernel.org,
linux-raid@...r.kernel.org,
yukuai1@...weicloud.com,
yi.zhang@...wei.com,
yangerkun@...wei.com,
johnny.chenyi@...wei.com
Subject: [PATCH 23/23] md/md-llbitmap: add Kconfig
From: Yu Kuai <yukuai3@...wei.com>
A new config MD_LLBITMAP is added, user can now using llbitmap to
replace the old bitmap.
Signed-off-by: Yu Kuai <yukuai3@...wei.com>
---
drivers/md/Kconfig | 11 +++++++
drivers/md/Makefile | 2 +-
drivers/md/md-bitmap.h | 13 ++++++++
drivers/md/md-llbitmap.c | 66 ++++++++++++++++++++++++++++++++++++++++
drivers/md/md.c | 6 ++++
drivers/md/md.h | 4 +--
6 files changed, 99 insertions(+), 3 deletions(-)
diff --git a/drivers/md/Kconfig b/drivers/md/Kconfig
index f913579e731c..07c19b2182ca 100644
--- a/drivers/md/Kconfig
+++ b/drivers/md/Kconfig
@@ -52,6 +52,17 @@ config MD_BITMAP
If unsure, say Y.
+config MD_LLBITMAP
+ bool "MD RAID lockless bitmap support"
+ depends on BLK_DEV_MD
+ help
+ If you say Y here, support for the lockless write intent bitmap will
+ be enabled.
+
+ Note, this is an experimental feature.
+
+ If unsure, say N.
+
config MD_AUTODETECT
bool "Autodetect RAID arrays during kernel boot"
depends on BLK_DEV_MD=y
diff --git a/drivers/md/Makefile b/drivers/md/Makefile
index 87bdfc9fe14c..f1ca25cc1408 100644
--- a/drivers/md/Makefile
+++ b/drivers/md/Makefile
@@ -27,7 +27,7 @@ dm-clone-y += dm-clone-target.o dm-clone-metadata.o
dm-verity-y += dm-verity-target.o
dm-zoned-y += dm-zoned-target.o dm-zoned-metadata.o dm-zoned-reclaim.o
-md-mod-y += md.o md-bitmap.o
+md-mod-y += md.o md-bitmap.o md-llbitmap.o
raid456-y += raid5.o raid5-cache.o raid5-ppl.o
linear-y += md-linear.o
diff --git a/drivers/md/md-bitmap.h b/drivers/md/md-bitmap.h
index a9a0f6a8d96d..8b4f2068931e 100644
--- a/drivers/md/md-bitmap.h
+++ b/drivers/md/md-bitmap.h
@@ -183,4 +183,17 @@ static inline void md_bitmap_exit(void)
}
#endif
+#ifdef CONFIG_MD_LLBITMAP
+int md_llbitmap_init(void);
+void md_llbitmap_exit(void);
+#else
+static inline int md_llbitmap_init(void)
+{
+ return 0;
+}
+static inline void md_llbitmap_exit(void)
+{
+}
+#endif
+
#endif
diff --git a/drivers/md/md-llbitmap.c b/drivers/md/md-llbitmap.c
index 38e67d4582ad..8321dcbf1ce2 100644
--- a/drivers/md/md-llbitmap.c
+++ b/drivers/md/md-llbitmap.c
@@ -1487,4 +1487,70 @@ static struct attribute_group md_llbitmap_group = {
.attrs = md_llbitmap_attrs,
};
+static struct bitmap_operations llbitmap_ops = {
+ .head = {
+ .type = MD_BITMAP,
+ .id = ID_LLBITMAP,
+ .name = "llbitmap",
+ },
+
+ .enabled = llbitmap_enabled,
+ .create = llbitmap_create,
+ .resize = llbitmap_resize,
+ .load = llbitmap_load,
+ .destroy = llbitmap_destroy,
+
+ .start_write = llbitmap_start_write,
+ .end_write = llbitmap_end_write,
+ .start_discard = llbitmap_start_discard,
+ .end_discard = llbitmap_end_discard,
+ .unplug = llbitmap_unplug,
+ .flush = llbitmap_flush,
+
+ .start_behind_write = llbitmap_start_behind_write,
+ .end_behind_write = llbitmap_end_behind_write,
+ .wait_behind_writes = llbitmap_wait_behind_writes,
+
+ .blocks_synced = llbitmap_blocks_synced,
+ .skip_sync_blocks = llbitmap_skip_sync_blocks,
+ .start_sync = llbitmap_start_sync,
+ .end_sync = llbitmap_end_sync,
+ .close_sync = llbitmap_close_sync,
+ .cond_end_sync = llbitmap_cond_end_sync,
+
+ .update_sb = llbitmap_update_sb,
+ .get_stats = llbitmap_get_stats,
+ .dirty_bits = llbitmap_dirty_bits,
+ .write_all = llbitmap_write_all,
+
+ .group = &md_llbitmap_group,
+};
+
+int md_llbitmap_init(void)
+{
+ md_llbitmap_io_wq = alloc_workqueue("md_llbitmap_io",
+ WQ_MEM_RECLAIM | WQ_UNBOUND, 0);
+ if (!md_llbitmap_io_wq)
+ return -ENOMEM;
+
+ md_llbitmap_unplug_wq = alloc_workqueue("md_llbitmap_unplug",
+ WQ_MEM_RECLAIM | WQ_UNBOUND, 0);
+ if (!md_llbitmap_unplug_wq) {
+ destroy_workqueue(md_llbitmap_io_wq);
+ md_llbitmap_io_wq = NULL;
+ return -ENOMEM;
+ }
+
+ return register_md_submodule(&llbitmap_ops.head);
+}
+
+void md_llbitmap_exit(void)
+{
+ destroy_workqueue(md_llbitmap_io_wq);
+ md_llbitmap_io_wq = NULL;
+ destroy_workqueue(md_llbitmap_unplug_wq);
+ md_llbitmap_unplug_wq = NULL;
+ unregister_md_submodule(&llbitmap_ops.head);
+}
+
#endif /* CONFIG_MD_LLBITMAP */
diff --git a/drivers/md/md.c b/drivers/md/md.c
index c7f7914b7452..52e19344b73e 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -10183,6 +10183,10 @@ static int __init md_init(void)
if (ret)
return ret;
+ ret = md_llbitmap_init();
+ if (ret)
+ goto err_bitmap;
+
ret = -ENOMEM;
md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0);
if (!md_wq)
@@ -10214,6 +10218,8 @@ static int __init md_init(void)
err_misc_wq:
destroy_workqueue(md_wq);
err_wq:
+ md_llbitmap_exit();
+err_bitmap:
md_bitmap_exit();
return ret;
}
diff --git a/drivers/md/md.h b/drivers/md/md.h
index 3adb1660c7ed..aba5f1ffcdfd 100644
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -26,7 +26,7 @@
enum md_submodule_type {
MD_PERSONALITY = 0,
MD_CLUSTER,
- MD_BITMAP, /* TODO */
+ MD_BITMAP,
};
enum md_submodule_id {
@@ -39,7 +39,7 @@ enum md_submodule_id {
ID_RAID10 = 10,
ID_CLUSTER,
ID_BITMAP,
- ID_LLBITMAP, /* TODO */
+ ID_LLBITMAP,
ID_BITMAP_NONE,
};
--
2.39.2
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