[dm-devel] [RFC PATCH 03/16] DM: Error if enough space is not available.

[Ram Pai]

if enough space is not available to create a block of the specified size error
out.

Signed-off-by: Ram Pai <linuxram at us.ibm.com>
---
 drivers/md/dm-inplace-compress.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/drivers/md/dm-inplace-compress.c b/drivers/md/dm-inplace-compress.c
index 70d6c0e..17221a1 100644
--- a/drivers/md/dm-inplace-compress.c
+++ b/drivers/md/dm-inplace-compress.c
@@ -453,6 +453,12 @@ static int dm_icomp_read_or_create_super(struct dm_icomp_info *info)
 	info->data_blocks = data_blocks;
 	info->data_start = (1 + meta_blocks) << DMCP_BLOCK_SECTOR_SHIFT;
 
+	if ((data_blocks << DMCP_BLOCK_SECTOR_SHIFT) < info->ti->len) {
+		info->ti->error =
+			"Insufficient sectors to satisfy requested size";
+		return -ENOMEM;
+	}
+
 	addr = kzalloc(DMCP_BLOCK_SIZE, GFP_KERNEL);
 	if (!addr) {
 		info->ti->error = "Cannot allocate super";
-- 
1.7.1