If S_ISREG swapfile's blocksize > PAGE_SIZE, it is not suitable to be
a swapfile, because swap slot is fixed to PAGE_SIZE.
This patch check this situation and return -EINVAL if it happens.
Signed-off-by: Weijie Yang <[email protected]>
---
mm/page_io.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/mm/page_io.c b/mm/page_io.c
index 7247be6..3d9bd12 100644
--- a/mm/page_io.c
+++ b/mm/page_io.c
@@ -150,6 +150,8 @@ int generic_swapfile_activate(struct swap_info_struct *sis,
int ret;
blkbits = inode->i_blkbits;
+ if(blkbits > PAGE_SHIFT)
+ return -EINVAL;
blocks_per_page = PAGE_SIZE >> blkbits;
/*
--
1.7.10.4