From 17bf1418b78d9c51370f29c2b840f7d0a1bf311a Mon Sep 17 00:00:00 2001 From: Joseph Qi <joseph.qi@huawei.com> Date: Wed, 4 Jun 2014 16:06:17 -0700 Subject: [PATCH] ocfs2: fix incorrect i_size of global bitmap inode after resize Ocfs2 cluster size may be 1MB, which has 20 bits. When resize, the input new clusters is mostly the number of clusters in a group descriptor(32256). Since the input clusters is defined as type int, so it will overflow when shift left 20 bits and then lead to incorrect global bitmap i_size. Signed-off-by: Joseph Qi <joseph.qi@huawei.com> Cc: Mark Fasheh <mfasheh@suse.com> Cc: Joel Becker <jlbec@evilplan.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> --- fs/ocfs2/resize.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/fs/ocfs2/resize.c b/fs/ocfs2/resize.c index 168739c2ad2b..d5da6f624142 100644 --- a/fs/ocfs2/resize.c +++ b/fs/ocfs2/resize.c @@ -153,7 +153,7 @@ static int ocfs2_update_last_group_and_inode(handle_t *handle, spin_lock(&OCFS2_I(bm_inode)->ip_lock); OCFS2_I(bm_inode)->ip_clusters = le32_to_cpu(fe->i_clusters); - le64_add_cpu(&fe->i_size, new_clusters << osb->s_clustersize_bits); + le64_add_cpu(&fe->i_size, (u64)new_clusters << osb->s_clustersize_bits); spin_unlock(&OCFS2_I(bm_inode)->ip_lock); i_size_write(bm_inode, le64_to_cpu(fe->i_size)); @@ -563,7 +563,7 @@ int ocfs2_group_add(struct inode *inode, struct ocfs2_new_group_input *input) spin_lock(&OCFS2_I(main_bm_inode)->ip_lock); OCFS2_I(main_bm_inode)->ip_clusters = le32_to_cpu(fe->i_clusters); - le64_add_cpu(&fe->i_size, input->clusters << osb->s_clustersize_bits); + le64_add_cpu(&fe->i_size, (u64)input->clusters << osb->s_clustersize_bits); spin_unlock(&OCFS2_I(main_bm_inode)->ip_lock); i_size_write(main_bm_inode, le64_to_cpu(fe->i_size));