[Ocfs2-devel] [PATCH] ocfs2: fix incorrect i_size of global bitmap inode after resize
Joseph Qi
joseph.qi at huawei.com
Fri May 23 03:02:28 PDT 2014
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 at huawei.com>
---
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 822ebc1..4261c74 100644
--- a/fs/ocfs2/resize.c
+++ b/fs/ocfs2/resize.c
@@ -157,7 +157,7 @@ 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));
@@ -569,7 +569,7 @@ 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));
--
1.8.4.3
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