From: Yu Kuai <yukuai3@xxxxxxxxxx>
Include following left APIs
- llbitmap_enabled
- llbitmap_dirty_bits
- llbitmap_update_sb
- llbitmap_write_all
- llbitmap_start_behind_write
- llbitmap_end_behind_write
- llbitmap_wait_behind_writes
Signed-off-by: Yu Kuai <yukuai3@xxxxxxxxxx>
---
drivers/md/md-llbitmap.c | 114 +++++++++++++++++++++++++++++++++++++++
1 file changed, 114 insertions(+)
diff --git a/drivers/md/md-llbitmap.c b/drivers/md/md-llbitmap.c
index 1b7625d3e2ed..ae664aa110a8 100644
--- a/drivers/md/md-llbitmap.c
+++ b/drivers/md/md-llbitmap.c
@@ -1277,4 +1277,118 @@ static void llbitmap_cond_end_sync(struct mddev *mddev, sector_t sector,
sysfs_notify_dirent_safe(mddev->sysfs_completed);
}
+static bool llbitmap_enabled(void *data)
+{
+ struct llbitmap *llbitmap = data;
+
+ return llbitmap && !test_bit(BITMAP_WRITE_ERROR, &llbitmap->flags);
+}
+
+static void llbitmap_dirty_bits(struct mddev *mddev, unsigned long s,
+ unsigned long e)
+{
+ llbitmap_state_machine(mddev->bitmap, s, e, BitmapActionStartwrite);
+}
+
+static void llbitmap_write_sb(struct llbitmap *llbitmap)
+{
+ int nr_bits = DIV_ROUND_UP(BITMAP_SB_SIZE, llbitmap->io_size);
+
+ bitmap_fill(llbitmap->pctl[0]->dirty, nr_bits);
+ llbitmap_write_page(llbitmap, 0);
+ md_super_wait(llbitmap->mddev);
+}
+
+static void llbitmap_update_sb(void *data)
+{
+ struct llbitmap *llbitmap = data;
+ struct mddev *mddev = llbitmap->mddev;
+ struct page *sb_page;
+ bitmap_super_t *sb;
+
+ if (test_bit(BITMAP_WRITE_ERROR, &llbitmap->flags))
+ return;
+
+ sb_page = llbitmap_read_page(llbitmap, 0);
+ if (IS_ERR(sb_page)) {
+ pr_err("%s: %s: read super block failed", __func__,
+ mdname(mddev));
+ set_bit(BITMAP_WRITE_ERROR, &llbitmap->flags);
+ return;
+ }
+
+ if (mddev->events < llbitmap->events_cleared)
+ llbitmap->events_cleared = mddev->events;
+
+ sb = kmap_local_page(sb_page);
+ sb->events = cpu_to_le64(mddev->events);
+ sb->state = cpu_to_le32(llbitmap->flags);
+ sb->chunksize = cpu_to_le32(llbitmap->chunksize);
+ sb->sync_size = cpu_to_le64(mddev->resync_max_sectors);
+ sb->events_cleared = cpu_to_le64(llbitmap->events_cleared);
+ sb->sectors_reserved = cpu_to_le32(mddev->bitmap_info.space);
+ sb->daemon_sleep = cpu_to_le32(mddev->bitmap_info.daemon_sleep);
+
+ kunmap_local(sb);
+ llbitmap_write_sb(llbitmap);
+}
+
+static int llbitmap_get_stats(void *data, struct md_bitmap_stats *stats)
+{
+ struct llbitmap *llbitmap = data;
+
+ memset(stats, 0, sizeof(*stats));
+
+ stats->missing_pages = 0;
+ stats->pages = llbitmap->nr_pages;
+ stats->file_pages = llbitmap->nr_pages;
+
+ stats->behind_writes = atomic_read(&llbitmap->behind_writes);
+ stats->behind_wait = wq_has_sleeper(&llbitmap->behind_wait);
+ stats->events_cleared = llbitmap->events_cleared;
+
+ return 0;
+}
+
+/* just flag all pages as needing to be written */
+static void llbitmap_write_all(struct mddev *mddev)
+{
+ int i;
+ struct llbitmap *llbitmap = mddev->bitmap;
+
+ for (i = 0; i < llbitmap->nr_pages; i++) {
+ struct llbitmap_page_ctl *pctl = llbitmap->pctl[i];
+
+ set_bit(LLPageDirty, &pctl->flags);
+ bitmap_fill(pctl->dirty, llbitmap->bits_per_page);
+ }
+}
+
+static void llbitmap_start_behind_write(struct mddev *mddev)
+{
+ struct llbitmap *llbitmap = mddev->bitmap;
+
+ atomic_inc(&llbitmap->behind_writes);
+}
+
+static void llbitmap_end_behind_write(struct mddev *mddev)
+{
+ struct llbitmap *llbitmap = mddev->bitmap;
+
+ if (atomic_dec_and_test(&llbitmap->behind_writes))
+ wake_up(&llbitmap->behind_wait);
+}
+
+static void llbitmap_wait_behind_writes(struct mddev *mddev)
+{
+ struct llbitmap *llbitmap = mddev->bitmap;
+
+ if (!llbitmap)
+ return;
+
+ wait_event(llbitmap->behind_wait,
+ atomic_read(&llbitmap->behind_writes) == 0);
+
+}
+
#endif /* CONFIG_MD_LLBITMAP */
--
2.39.2
