ocfs2: take inode lock when get clusters

We need take inode lock when calling ocfs2_get_clusters.
And use GFP_NOFS instead of GFP_KERNEL.

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>

diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c
index 2a618dd..973a636 100644 (file)
--- a/fs/ocfs2/aops.c
+++ b/fs/ocfs2/aops.c
@@ -772,10 +772,17 @@ static ssize_t ocfs2_direct_IO_write(struct kiocb *iocb,
                u32 p_cpos = 0;
                u32 v_cpos = ocfs2_bytes_to_clusters(osb->sb, offset);
 
+               ret = ocfs2_inode_lock(inode, NULL, 0);
+               if (ret < 0) {
+                       mlog_errno(ret);
+                       goto clean_orphan;
+               }
+
                ret = ocfs2_get_clusters(inode, v_cpos, &p_cpos,
                                &num_clusters, &ext_flags);
                if (ret < 0) {
                        mlog_errno(ret);
+                       ocfs2_inode_unlock(inode, 0);
                        goto clean_orphan;
                }
 
@@ -783,9 +790,11 @@ static ssize_t ocfs2_direct_IO_write(struct kiocb *iocb,
 
                ret = blkdev_issue_zeroout(osb->sb->s_bdev,
                                p_cpos << (osb->s_clustersize_bits - 9),
-                               zero_len >> 9, GFP_KERNEL, false);
+                               zero_len >> 9, GFP_NOFS, false);
                if (ret < 0)
                        mlog_errno(ret);
+
+               ocfs2_inode_unlock(inode, 0);
        }
 
 clean_orphan: