add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/md/dm-log-writes.c
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@@ -40,7 +40,7 @@
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  *
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  * Would result in the log looking like this:
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  *
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- * c,a,flush,fuad,b,<other writes>,<next flush>
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+ * c,a,b,flush,fuad,<other writes>,<next flush>
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  *
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  * This is meant to help expose problems where file systems do not properly wait
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  * on data being written before invoking a FLUSH.  FUA bypasses cache so once it
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@@ -127,7 +127,7 @@
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 	char *data;
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 	u32 datalen;
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 	struct list_head list;
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-	struct bio_vec vecs[0];
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+	struct bio_vec vecs[];
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 };
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 struct per_bio_data {
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@@ -699,7 +699,7 @@
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 	if (discard_bio)
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 		alloc_size = sizeof(struct pending_block);
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 	else
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-		alloc_size = sizeof(struct pending_block) + sizeof(struct bio_vec) * bio_segments(bio);
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+		alloc_size = struct_size(block, vecs, bio_segments(bio));
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 	block = kzalloc(alloc_size, GFP_NOIO);
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 	if (!block) {
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@@ -994,10 +994,26 @@
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 	return dax_copy_to_iter(lc->dev->dax_dev, pgoff, addr, bytes, i);
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 }
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+static int log_writes_dax_zero_page_range(struct dm_target *ti, pgoff_t pgoff,
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+					  size_t nr_pages)
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+{
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+	int ret;
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+	struct log_writes_c *lc = ti->private;
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+	sector_t sector = pgoff * PAGE_SECTORS;
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+
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+	ret = bdev_dax_pgoff(lc->dev->bdev, sector, nr_pages << PAGE_SHIFT,
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+			     &pgoff);
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+	if (ret)
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+		return ret;
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+	return dax_zero_page_range(lc->dev->dax_dev, pgoff,
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+				   nr_pages << PAGE_SHIFT);
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+}
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+
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 #else
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 #define log_writes_dax_direct_access NULL
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 #define log_writes_dax_copy_from_iter NULL
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 #define log_writes_dax_copy_to_iter NULL
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+#define log_writes_dax_zero_page_range NULL
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 #endif
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 static struct target_type log_writes_target = {
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@@ -1016,6 +1032,7 @@
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 	.direct_access = log_writes_dax_direct_access,
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 	.dax_copy_from_iter = log_writes_dax_copy_from_iter,
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 	.dax_copy_to_iter = log_writes_dax_copy_to_iter,
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+	.dax_zero_page_range = log_writes_dax_zero_page_range,
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 };
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 static int __init dm_log_writes_init(void)