[PATCH] v9fs: fix races in fid allocation

Fid management cleanup.  The patch attempts to fix the races in dentry's
fid management.

Dentries don't keep the opened fids anymore, they are moved to the file
structs.  Ideally there should be no more than one fid with fidcreate equal
to zero in the dentry's list of fids.

v9fs_fid_create initializes the important fields (fid, fidcreated) before
v9fs_fid is added to the list.  v9fs_fid_lookup returns only fids that are
not created by v9fs_create.  v9fs_fid_get_created returns the fid created
by the same process by v9fs_create (if any) and removes it from dentry's
list

Signed-off-by: Latchesar Ionkov <lucho@ionkov.net>
Cc: Eric Van Hensbergen <ericvh@gmail.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 8 insertions, 13 deletions

diff --git a/fs/9p/vfs_super.c b/fs/9p/vfs_super.c
index 1e2b2b54d300..0957f4da91d4 100644
--- a/fs/9p/vfs_super.c
+++ b/fs/9p/vfs_super.c
@@ -129,8 +129,7 @@ static struct super_block *v9fs_get_sb(struct file_system_type
 
         if ((newfid = v9fs_session_init(v9ses, dev_name, data)) < 0) {
                 dprintk(DEBUG_ERROR, "problem initiating session\n");
-                kfree(v9ses);
-                return ERR_PTR(newfid);
+                return newfid;
         }
 
         sb = sget(fs_type, NULL, v9fs_set_super, v9ses);
@@ -155,23 +154,19 @@ static struct super_block *v9fs_get_sb(struct file_system_type
 
         sb->s_root = root;
 
-        /* Setup the Root Inode */
-        root_fid = v9fs_fid_create(root);
-        if (root_fid == NULL) {
-                retval = -ENOMEM;
-                goto put_back_sb;
-        }
-
-        root_fid->fidopen = 0;
-        root_fid->v9ses = v9ses;
-
         stat_result = v9fs_t_stat(v9ses, newfid, &fcall);
         if (stat_result < 0) {
                 dprintk(DEBUG_ERROR, "stat error\n");
                 v9fs_t_clunk(v9ses, newfid, NULL);
                 v9fs_put_idpool(newfid, &v9ses->fidpool);
         } else {
-                root_fid->fid = newfid;
+                /* Setup the Root Inode */
+                root_fid = v9fs_fid_create(root, v9ses, newfid, 0);
+                if (root_fid == NULL) {
+                        retval = -ENOMEM;
+                        goto put_back_sb;
+                }
+
                 root_fid->qid = fcall->params.rstat.stat->qid;
                 root->d_inode->i_ino =
                     v9fs_qid2ino(&fcall->params.rstat.stat->qid);