path: root/fs/9p/v9fs.h
diff options
authorAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>2010-06-30 19:18:50 +0530
committerEric Van Hensbergen <ericvh@gmail.com>2010-08-02 14:28:35 -0500
commita534c8d15b1f1d0f861fc2bb9e0529bd8486ec3f (patch)
tree0451da7a61bd7e3eb5968d65beee3243f7f51b5d /fs/9p/v9fs.h
parentebf46264a004818fe5b23f0ac18ac7336897d807 (diff)
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 <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
Diffstat (limited to 'fs/9p/v9fs.h')
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/9p/v9fs.h b/fs/9p/v9fs.h
index bec4d0bcb45..4c963c9fc41 100644
--- a/fs/9p/v9fs.h
+++ b/fs/9p/v9fs.h
@@ -104,6 +104,7 @@ struct v9fs_session_info {
struct p9_client *clnt; /* 9p client */
struct list_head slist; /* list of sessions registered with v9fs */
struct backing_dev_info bdi;
+ struct rw_semaphore rename_sem;
struct p9_fid *v9fs_session_init(struct v9fs_session_info *, const char *,