From a534c8d15b1f1d0f861fc2bb9e0529bd8486ec3f Mon Sep 17 00:00:00 2001 From: "Aneesh Kumar K.V" Date: Wed, 30 Jun 2010 19:18:50 +0530 Subject: fs/9p: Prevent parallel rename when doing fid_lookup During fid lookup we need to make sure that the dentry->d_parent doesn't change so that we can safely walk the parent dentries. To ensure that we need to prevent cross directory rename during fid_lookup. Add a per superblock rename_sem rw_semaphore to prevent parallel fid lookup and rename. Signed-off-by: Aneesh Kumar K.V Signed-off-by: Venkateswararao Jujjuri Signed-off-by: Eric Van Hensbergen --- fs/9p/v9fs.c | 1 + 1 file changed, 1 insertion(+) (limited to 'fs/9p/v9fs.c') diff --git a/fs/9p/v9fs.c b/fs/9p/v9fs.c index 3c492011221c..38dc0e067599 100644 --- a/fs/9p/v9fs.c +++ b/fs/9p/v9fs.c @@ -237,6 +237,7 @@ struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses, __putname(v9ses->uname); return ERR_PTR(-ENOMEM); } + init_rwsem(&v9ses->rename_sem); rc = bdi_setup_and_register(&v9ses->bdi, "9p", BDI_CAP_MAP_COPY); if (rc) { -- cgit v1.2.3