diff options
| -rw-r--r-- | fs/nfsd/nfs4acl.c | 21 |
1 files changed, 20 insertions, 1 deletions
diff --git a/fs/nfsd/nfs4acl.c b/fs/nfsd/nfs4acl.c index 0a69cce33efe..832673b14587 100644 --- a/fs/nfsd/nfs4acl.c +++ b/fs/nfsd/nfs4acl.c @@ -416,6 +416,7 @@ struct posix_ace_state_array { * calculated so far: */ struct posix_acl_state { + int empty; struct posix_ace_state owner; struct posix_ace_state group; struct posix_ace_state other; @@ -431,6 +432,7 @@ init_state(struct posix_acl_state *state, int cnt) int alloc; memset(state, 0, sizeof(struct posix_acl_state)); + state->empty = 1; /* * In the worst case, each individual acl could be for a distinct * named user or group, but we don't no which, so we allocate @@ -498,6 +500,20 @@ posix_state_to_acl(struct posix_acl_state *state, unsigned int flags) int nace; int i, error = 0; + /* + * ACLs with no ACEs are treated differently in the inheritable + * and effective cases: when there are no inheritable ACEs, we + * set a zero-length default posix acl: + */ + if (state->empty && (flags & NFS4_ACL_TYPE_DEFAULT)) { + pacl = posix_acl_alloc(0, GFP_KERNEL); + return pacl ? pacl : ERR_PTR(-ENOMEM); + } + /* + * When there are no effective ACEs, the following will end + * up setting a 3-element effective posix ACL with all + * permissions zero. + */ nace = 4 + state->users->n + state->groups->n; pacl = posix_acl_alloc(nace, GFP_KERNEL); if (!pacl) @@ -613,6 +629,8 @@ static void process_one_v4_ace(struct posix_acl_state *state, u32 mask = ace->access_mask; int i; + state->empty = 0; + switch (ace2type(ace)) { case ACL_USER_OBJ: if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) { @@ -717,7 +735,8 @@ int nfs4_acl_nfsv4_to_posix(struct nfs4_acl *acl, struct posix_acl **pacl, ret = PTR_ERR(*pacl); goto out_dstate; } - *dpacl = posix_state_to_acl(&default_acl_state, flags); + *dpacl = posix_state_to_acl(&default_acl_state, + flags | NFS4_ACL_TYPE_DEFAULT); if (IS_ERR(*dpacl)) { ret = PTR_ERR(*dpacl); posix_acl_release(*pacl); |