4 #include <linux/nfs3.h>
5 #include <linux/nfs_fs.h>
6 #include <linux/posix_acl_xattr.h>
7 #include <linux/nfsacl.h>
11 #define NFSDBG_FACILITY NFSDBG_PROC
13 struct posix_acl *nfs3_get_acl(struct inode *inode, int type)
15 struct nfs_server *server = NFS_SERVER(inode);
16 struct page *pages[NFSACL_MAXPAGES] = { };
17 struct nfs3_getaclargs args = {
19 /* The xdr layer may allocate pages here. */
22 struct nfs3_getaclres res = {
25 struct rpc_message msg = {
31 if (!nfs_server_capable(inode, NFS_CAP_ACLS))
32 return ERR_PTR(-EOPNOTSUPP);
34 status = nfs_revalidate_inode(server, inode);
36 return ERR_PTR(status);
39 * Only get the access acl when explicitly requested: We don't
40 * need it for access decisions, and only some applications use
41 * it. Applications which request the access acl first are not
42 * penalized from this optimization.
44 if (type == ACL_TYPE_ACCESS)
45 args.mask |= NFS_ACLCNT|NFS_ACL;
46 if (S_ISDIR(inode->i_mode))
47 args.mask |= NFS_DFACLCNT|NFS_DFACL;
51 dprintk("NFS call getacl\n");
52 msg.rpc_proc = &server->client_acl->cl_procinfo[ACLPROC3_GETACL];
53 res.fattr = nfs_alloc_fattr();
54 if (res.fattr == NULL)
55 return ERR_PTR(-ENOMEM);
57 status = rpc_call_sync(server->client_acl, &msg, 0);
58 dprintk("NFS reply getacl: %d\n", status);
60 /* pages may have been allocated at the xdr layer. */
61 for (count = 0; count < NFSACL_MAXPAGES && args.pages[count]; count++)
62 __free_page(args.pages[count]);
66 status = nfs_refresh_inode(inode, res.fattr);
69 case -EPROTONOSUPPORT:
70 dprintk("NFS_V3_ACL extension not supported; disabling\n");
71 server->caps &= ~NFS_CAP_ACLS;
77 if ((args.mask & res.mask) != args.mask) {
82 if (res.acl_access != NULL) {
83 if ((posix_acl_equiv_mode(res.acl_access, NULL) == 0) ||
84 res.acl_access->a_count == 0) {
85 posix_acl_release(res.acl_access);
86 res.acl_access = NULL;
90 if (res.mask & NFS_ACL)
91 set_cached_acl(inode, ACL_TYPE_ACCESS, res.acl_access);
93 forget_cached_acl(inode, ACL_TYPE_ACCESS);
95 if (res.mask & NFS_DFACL)
96 set_cached_acl(inode, ACL_TYPE_DEFAULT, res.acl_default);
98 forget_cached_acl(inode, ACL_TYPE_DEFAULT);
100 nfs_free_fattr(res.fattr);
101 if (type == ACL_TYPE_ACCESS) {
102 posix_acl_release(res.acl_default);
103 return res.acl_access;
105 posix_acl_release(res.acl_access);
106 return res.acl_default;
110 posix_acl_release(res.acl_access);
111 posix_acl_release(res.acl_default);
112 nfs_free_fattr(res.fattr);
113 return ERR_PTR(status);
116 static int __nfs3_proc_setacls(struct inode *inode, struct posix_acl *acl,
117 struct posix_acl *dfacl)
119 struct nfs_server *server = NFS_SERVER(inode);
120 struct nfs_fattr *fattr;
121 struct page *pages[NFSACL_MAXPAGES];
122 struct nfs3_setaclargs args = {
128 struct rpc_message msg = {
134 if (acl == NULL && (!S_ISDIR(inode->i_mode) || dfacl == NULL))
137 status = -EOPNOTSUPP;
138 if (!nfs_server_capable(inode, NFS_CAP_ACLS))
141 /* We are doing this here because XDR marshalling does not
142 * return any results, it BUGs. */
144 if (acl != NULL && acl->a_count > NFS_ACL_MAX_ENTRIES)
146 if (dfacl != NULL && dfacl->a_count > NFS_ACL_MAX_ENTRIES)
148 if (S_ISDIR(inode->i_mode)) {
149 args.mask |= NFS_DFACL;
150 args.acl_default = dfacl;
151 args.len = nfsacl_size(acl, dfacl);
153 args.len = nfsacl_size(acl, NULL);
155 if (args.len > NFS_ACL_INLINE_BUFSIZE) {
156 unsigned int npages = 1 + ((args.len - 1) >> PAGE_SHIFT);
160 args.pages[args.npages] = alloc_page(GFP_KERNEL);
161 if (args.pages[args.npages] == NULL)
164 } while (args.npages < npages);
167 dprintk("NFS call setacl\n");
169 fattr = nfs_alloc_fattr();
173 msg.rpc_proc = &server->client_acl->cl_procinfo[ACLPROC3_SETACL];
174 msg.rpc_resp = fattr;
175 status = rpc_call_sync(server->client_acl, &msg, 0);
176 nfs_access_zap_cache(inode);
177 nfs_zap_acl_cache(inode);
178 dprintk("NFS reply setacl: %d\n", status);
182 status = nfs_refresh_inode(inode, fattr);
183 set_cached_acl(inode, ACL_TYPE_ACCESS, acl);
184 set_cached_acl(inode, ACL_TYPE_DEFAULT, dfacl);
187 case -EPROTONOSUPPORT:
188 dprintk("NFS_V3_ACL SETACL RPC not supported"
189 "(will not retry)\n");
190 server->caps &= ~NFS_CAP_ACLS;
192 status = -EOPNOTSUPP;
194 nfs_free_fattr(fattr);
196 while (args.npages != 0) {
198 __free_page(args.pages[args.npages]);
204 int nfs3_proc_setacls(struct inode *inode, struct posix_acl *acl,
205 struct posix_acl *dfacl)
208 ret = __nfs3_proc_setacls(inode, acl, dfacl);
209 return (ret == -EOPNOTSUPP) ? 0 : ret;
213 int nfs3_set_acl(struct inode *inode, struct posix_acl *acl, int type)
215 struct posix_acl *alloc = NULL, *dfacl = NULL;
218 if (S_ISDIR(inode->i_mode)) {
220 case ACL_TYPE_ACCESS:
221 alloc = dfacl = get_acl(inode, ACL_TYPE_DEFAULT);
226 case ACL_TYPE_DEFAULT:
228 alloc = acl = get_acl(inode, ACL_TYPE_ACCESS);
236 alloc = acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
240 status = __nfs3_proc_setacls(inode, acl, dfacl);
241 posix_acl_release(alloc);
245 return PTR_ERR(alloc);
248 const struct xattr_handler *nfs3_xattr_handlers[] = {
249 &posix_acl_access_xattr_handler,
250 &posix_acl_default_xattr_handler,
255 nfs3_list_one_acl(struct inode *inode, int type, const char *name, void *data,
256 size_t size, ssize_t *result)
258 struct posix_acl *acl;
259 char *p = data + *result;
261 acl = get_acl(inode, type);
262 if (IS_ERR_OR_NULL(acl))
265 posix_acl_release(acl);
267 *result += strlen(name);
279 nfs3_listxattr(struct dentry *dentry, char *data, size_t size)
281 struct inode *inode = dentry->d_inode;
285 error = nfs3_list_one_acl(inode, ACL_TYPE_ACCESS,
286 POSIX_ACL_XATTR_ACCESS, data, size, &result);
290 error = nfs3_list_one_acl(inode, ACL_TYPE_DEFAULT,
291 POSIX_ACL_XATTR_DEFAULT, data, size, &result);