[Devel] [PATCH v5 vz9 5/7] dm-ploop: make ploop_preallocate_cluster() return error on unexpected file size change

[Konstantin Khorenko]

From: Pavel Tikhomirov <ptikhomirov at virtuozzo.com>

https://virtuozzo.atlassian.net/browse/VSTOR-108868
Co-developed-by: Andrey Zhadchenko <andrey.zhadchenko at virtuozzo.com>
Signed-off-by: Pavel Tikhomirov <ptikhomirov at virtuozzo.com>

Feature: dm-ploop: ploop target driver
---
 drivers/md/dm-ploop-map.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/md/dm-ploop-map.c b/drivers/md/dm-ploop-map.c
index b59e0d514c95f..aa3cd483f6a55 100644
--- a/drivers/md/dm-ploop-map.c
+++ b/drivers/md/dm-ploop-map.c
@@ -1194,12 +1194,16 @@ static int ploop_preallocate_cluster(struct ploop *ploop, struct file *file)
 		goto out;
 	}
 
-	/* here must be the only place to change file_size */
+	/*
+	 * Here must be the only place to change file_size.
+	 */
 	spin_lock_irqsave(&ploop->bat_lock, flags);
 	if (top->file_size < new_len) {
 		top->file_size = new_len;
 	} else {
 		PL_ERR("unexpected file size change\n");
+		ret = -EIO;
+		goto out;
 	}
 	if (ploop->prealloc_size)
 		goto prealloc_more;
-- 
2.43.0