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| author | Trond Myklebust <Trond.Myklebust@netapp.com> | 2012-05-23 13:24:36 -0400 |
|---|---|---|
| committer | Trond Myklebust <Trond.Myklebust@netapp.com> | 2012-05-23 15:21:13 -0400 |
| commit | 4697bd5e9419348ef9fa9b55cefe4355ad9d3d01 (patch) | |
| tree | 20bf5da80d10ec4df42ae0c3067af39a36f11c28 /fs/nfs/client.c | |
| parent | 7b38c3682c5cab4f98751d5fe57b78a59020653d (diff) | |
| download | op-kernel-dev-4697bd5e9419348ef9fa9b55cefe4355ad9d3d01.zip op-kernel-dev-4697bd5e9419348ef9fa9b55cefe4355ad9d3d01.tar.gz | |
NFSv4: Fix a race in the net namespace mount notification
Since the struct nfs_client gets added to the global nfs_client_list
before it is initialised, it is possible that rpc_pipefs_event can
end up trying to create idmapper entries on such a thing.
The solution is to have the mount notification wait for the
initialisation of each nfs_client to complete, and then to
skip any entries for which the it failed.
Reported-by: Stanislav Kinsbursky <skinsbursky@parallels.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Acked-by: Stanislav Kinsbursky <skinsbursky@parallels.com>
Diffstat (limited to 'fs/nfs/client.c')
| -rw-r--r-- | fs/nfs/client.c | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/fs/nfs/client.c b/fs/nfs/client.c index 25dde07..d356642 100644 --- a/fs/nfs/client.c +++ b/fs/nfs/client.c @@ -507,6 +507,17 @@ static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *dat return NULL; } +static bool nfs_client_init_is_complete(const struct nfs_client *clp) +{ + return clp->cl_cons_state != NFS_CS_INITING; +} + +int nfs_wait_client_init_complete(const struct nfs_client *clp) +{ + return wait_event_killable(nfs_client_active_wq, + nfs_client_init_is_complete(clp)); +} + /* * Found an existing client. Make sure it's ready before returning. */ @@ -516,8 +527,7 @@ nfs_found_client(const struct nfs_client_initdata *cl_init, { int error; - error = wait_event_killable(nfs_client_active_wq, - clp->cl_cons_state < NFS_CS_INITING); + error = nfs_wait_client_init_complete(clp); if (error < 0) { nfs_put_client(clp); return ERR_PTR(-ERESTARTSYS); @@ -1333,7 +1343,7 @@ static int nfs4_init_client_minor_version(struct nfs_client *clp) * so that the client back channel can find the * nfs_client struct */ - clp->cl_cons_state = NFS_CS_SESSION_INITING; + nfs_mark_client_ready(clp, NFS_CS_SESSION_INITING); } #endif /* CONFIG_NFS_V4_1 */ |
