change system file

hc

2024-10-09 244b2c5ca8b14627e4a17755e5922221e121c771

 kernel/drivers/md/dm-stripe.c
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@@ -41,7 +41,7 @@
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 	/* Work struct used for triggering events*/
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 	struct work_struct trigger_event;
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-	struct stripe stripe[0];
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+	struct stripe stripe[];
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 };
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 /*
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@@ -53,19 +53,6 @@
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 	struct stripe_c *sc = container_of(work, struct stripe_c,
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 					   trigger_event);
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 	dm_table_event(sc->ti->table);
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-}
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-
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-static inline struct stripe_c *alloc_context(unsigned int stripes)
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-{
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-	size_t len;
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-
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-	if (dm_array_too_big(sizeof(struct stripe_c), sizeof(struct stripe),
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-			     stripes))
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-		return NULL;
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-
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-	len = sizeof(struct stripe_c) + (sizeof(struct stripe) * stripes);
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-
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-	return kmalloc(len, GFP_KERNEL);
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 }
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 /*
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@@ -142,7 +129,7 @@
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 		return -EINVAL;
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 	}
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-	sc = alloc_context(stripes);
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+	sc = kmalloc(struct_size(sc, stripe, stripes), GFP_KERNEL);
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 	if (!sc) {
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 		ti->error = "Memory allocation for striped context "
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 		    "failed";
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@@ -373,10 +360,32 @@
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 	return dax_copy_to_iter(dax_dev, pgoff, addr, bytes, i);
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 }
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+static int stripe_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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+	sector_t dev_sector, sector = pgoff * PAGE_SECTORS;
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+	struct stripe_c *sc = ti->private;
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+	struct dax_device *dax_dev;
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+	struct block_device *bdev;
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+	uint32_t stripe;
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+
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+	stripe_map_sector(sc, sector, &stripe, &dev_sector);
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+	dev_sector += sc->stripe[stripe].physical_start;
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+	dax_dev = sc->stripe[stripe].dev->dax_dev;
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+	bdev = sc->stripe[stripe].dev->bdev;
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+
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+	ret = bdev_dax_pgoff(bdev, dev_sector, nr_pages << PAGE_SHIFT, &pgoff);
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+	if (ret)
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+		return ret;
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+	return dax_zero_page_range(dax_dev, pgoff, nr_pages);
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+}
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+
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 #else
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 #define stripe_dax_direct_access NULL
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 #define stripe_dax_copy_from_iter NULL
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 #define stripe_dax_copy_to_iter NULL
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+#define stripe_dax_zero_page_range NULL
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 #endif
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 /*
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@@ -499,6 +508,7 @@
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 	.direct_access = stripe_dax_direct_access,
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 	.dax_copy_from_iter = stripe_dax_copy_from_iter,
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 	.dax_copy_to_iter = stripe_dax_copy_to_iter,
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+	.dax_zero_page_range = stripe_dax_zero_page_range,
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 };
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 int __init dm_stripe_init(void)