ocfs2: shared writeable mmap

Implement cluster consistent shared writeable mappings using the
->page_mkwrite() callback.

Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c
index 4c850d00c269..a80f31776d94 100644
--- a/fs/ocfs2/file.c
+++ b/fs/ocfs2/file.c
@@ -1001,6 +1001,13 @@ int ocfs2_setattr(struct dentry *dentry, struct iattr *attr)
                 goto bail_unlock;
         }
 
+        /*
+         * This will intentionally not wind up calling vmtruncate(),
+         * since all the work for a size change has been done above.
+         * Otherwise, we could get into problems with truncate as
+         * ip_alloc_sem is used there to protect against i_size
+         * changes.
+         */
         status = inode_setattr(inode, attr);
         if (status < 0) {
                 mlog_errno(status);