blob: 871d6eda8dba1247e882919aff0cc20e9d0e3392 [file] [log] [blame]
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +00001#include <linux/fs.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +09002#include <linux/gfp.h>
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +00003#include <linux/nfs.h>
4#include <linux/nfs3.h>
5#include <linux/nfs_fs.h>
Christoph Hellwig334a13e2005-06-28 20:44:58 -07006#include <linux/posix_acl_xattr.h>
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +00007#include <linux/nfsacl.h>
8
Trond Myklebustf41f7412008-06-11 17:39:04 -04009#include "internal.h"
10
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +000011#define NFSDBG_FACILITY NFSDBG_PROC
12
Christoph Hellwig013cdf12013-12-20 05:16:53 -080013struct posix_acl *nfs3_get_acl(struct inode *inode, int type)
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +000014{
15 struct nfs_server *server = NFS_SERVER(inode);
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +000016 struct page *pages[NFSACL_MAXPAGES] = { };
17 struct nfs3_getaclargs args = {
18 .fh = NFS_FH(inode),
19 /* The xdr layer may allocate pages here. */
20 .pages = pages,
21 };
22 struct nfs3_getaclres res = {
Trond Myklebust17280172012-03-11 13:11:00 -040023 NULL,
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +000024 };
Chuck Leverdead28d2006-03-20 13:44:23 -050025 struct rpc_message msg = {
26 .rpc_argp = &args,
27 .rpc_resp = &res,
28 };
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +000029 int status, count;
30
31 if (!nfs_server_capable(inode, NFS_CAP_ACLS))
32 return ERR_PTR(-EOPNOTSUPP);
33
Andreas Gruenbacher5c6a9f72005-06-22 17:16:27 +000034 status = nfs_revalidate_inode(server, inode);
35 if (status < 0)
36 return ERR_PTR(status);
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +000037
Andreas Gruenbacher5c6a9f72005-06-22 17:16:27 +000038 /*
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.
43 */
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;
48 if (args.mask == 0)
49 return NULL;
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +000050
51 dprintk("NFS call getacl\n");
Chuck Leverdead28d2006-03-20 13:44:23 -050052 msg.rpc_proc = &server->client_acl->cl_procinfo[ACLPROC3_GETACL];
Trond Myklebust6e94d622010-04-16 16:22:52 -040053 res.fattr = nfs_alloc_fattr();
54 if (res.fattr == NULL)
55 return ERR_PTR(-ENOMEM);
56
Chuck Leverdead28d2006-03-20 13:44:23 -050057 status = rpc_call_sync(server->client_acl, &msg, 0);
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +000058 dprintk("NFS reply getacl: %d\n", status);
59
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]);
63
64 switch (status) {
65 case 0:
Trond Myklebust6e94d622010-04-16 16:22:52 -040066 status = nfs_refresh_inode(inode, res.fattr);
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +000067 break;
68 case -EPFNOSUPPORT:
69 case -EPROTONOSUPPORT:
70 dprintk("NFS_V3_ACL extension not supported; disabling\n");
71 server->caps &= ~NFS_CAP_ACLS;
72 case -ENOTSUPP:
73 status = -EOPNOTSUPP;
74 default:
75 goto getout;
76 }
77 if ((args.mask & res.mask) != args.mask) {
78 status = -EIO;
79 goto getout;
80 }
81
82 if (res.acl_access != NULL) {
Noah Massey718360c2014-01-30 21:31:12 -050083 if ((posix_acl_equiv_mode(res.acl_access, NULL) == 0) ||
Christoph Hellwig013cdf12013-12-20 05:16:53 -080084 res.acl_access->a_count == 0) {
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +000085 posix_acl_release(res.acl_access);
86 res.acl_access = NULL;
87 }
88 }
89
Christoph Hellwig013cdf12013-12-20 05:16:53 -080090 if (res.mask & NFS_ACL)
91 set_cached_acl(inode, ACL_TYPE_ACCESS, res.acl_access);
92 else
93 forget_cached_acl(inode, ACL_TYPE_ACCESS);
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +000094
Christoph Hellwig013cdf12013-12-20 05:16:53 -080095 if (res.mask & NFS_DFACL)
96 set_cached_acl(inode, ACL_TYPE_DEFAULT, res.acl_default);
97 else
98 forget_cached_acl(inode, ACL_TYPE_DEFAULT);
99
100 nfs_free_fattr(res.fattr);
101 if (type == ACL_TYPE_ACCESS) {
102 posix_acl_release(res.acl_default);
103 return res.acl_access;
104 } else {
105 posix_acl_release(res.acl_access);
106 return res.acl_default;
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +0000107 }
108
109getout:
110 posix_acl_release(res.acl_access);
111 posix_acl_release(res.acl_default);
Trond Myklebust6e94d622010-04-16 16:22:52 -0400112 nfs_free_fattr(res.fattr);
Christoph Hellwig013cdf12013-12-20 05:16:53 -0800113 return ERR_PTR(status);
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +0000114}
115
Trond Myklebust8f493b92014-02-02 14:36:42 -0500116static int __nfs3_proc_setacls(struct inode *inode, struct posix_acl *acl,
Christoph Hellwig013cdf12013-12-20 05:16:53 -0800117 struct posix_acl *dfacl)
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +0000118{
119 struct nfs_server *server = NFS_SERVER(inode);
Trond Myklebust6e94d622010-04-16 16:22:52 -0400120 struct nfs_fattr *fattr;
Trond Myklebustae461412009-03-10 20:33:18 -0400121 struct page *pages[NFSACL_MAXPAGES];
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +0000122 struct nfs3_setaclargs args = {
123 .inode = inode,
124 .mask = NFS_ACL,
125 .acl_access = acl,
126 .pages = pages,
127 };
Chuck Leverdead28d2006-03-20 13:44:23 -0500128 struct rpc_message msg = {
129 .rpc_argp = &args,
130 .rpc_resp = &fattr,
131 };
Trond Myklebustae461412009-03-10 20:33:18 -0400132 int status;
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +0000133
134 status = -EOPNOTSUPP;
135 if (!nfs_server_capable(inode, NFS_CAP_ACLS))
136 goto out;
137
Chuck Leverf61f6da2011-01-21 03:05:38 +0000138 /* We are doing this here because XDR marshalling does not
139 * return any results, it BUGs. */
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +0000140 status = -ENOSPC;
141 if (acl != NULL && acl->a_count > NFS_ACL_MAX_ENTRIES)
142 goto out;
143 if (dfacl != NULL && dfacl->a_count > NFS_ACL_MAX_ENTRIES)
144 goto out;
145 if (S_ISDIR(inode->i_mode)) {
146 args.mask |= NFS_DFACL;
147 args.acl_default = dfacl;
Trond Myklebustae461412009-03-10 20:33:18 -0400148 args.len = nfsacl_size(acl, dfacl);
149 } else
150 args.len = nfsacl_size(acl, NULL);
151
152 if (args.len > NFS_ACL_INLINE_BUFSIZE) {
153 unsigned int npages = 1 + ((args.len - 1) >> PAGE_SHIFT);
154
155 status = -ENOMEM;
156 do {
157 args.pages[args.npages] = alloc_page(GFP_KERNEL);
158 if (args.pages[args.npages] == NULL)
159 goto out_freepages;
160 args.npages++;
161 } while (args.npages < npages);
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +0000162 }
163
164 dprintk("NFS call setacl\n");
Trond Myklebust6e94d622010-04-16 16:22:52 -0400165 status = -ENOMEM;
166 fattr = nfs_alloc_fattr();
167 if (fattr == NULL)
168 goto out_freepages;
169
Chuck Leverdead28d2006-03-20 13:44:23 -0500170 msg.rpc_proc = &server->client_acl->cl_procinfo[ACLPROC3_SETACL];
Trond Myklebust6e94d622010-04-16 16:22:52 -0400171 msg.rpc_resp = fattr;
Chuck Leverdead28d2006-03-20 13:44:23 -0500172 status = rpc_call_sync(server->client_acl, &msg, 0);
Trond Myklebustf41f7412008-06-11 17:39:04 -0400173 nfs_access_zap_cache(inode);
174 nfs_zap_acl_cache(inode);
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +0000175 dprintk("NFS reply setacl: %d\n", status);
176
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +0000177 switch (status) {
178 case 0:
Trond Myklebust6e94d622010-04-16 16:22:52 -0400179 status = nfs_refresh_inode(inode, fattr);
Christoph Hellwig013cdf12013-12-20 05:16:53 -0800180 set_cached_acl(inode, ACL_TYPE_ACCESS, acl);
181 set_cached_acl(inode, ACL_TYPE_DEFAULT, dfacl);
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +0000182 break;
183 case -EPFNOSUPPORT:
184 case -EPROTONOSUPPORT:
185 dprintk("NFS_V3_ACL SETACL RPC not supported"
186 "(will not retry)\n");
187 server->caps &= ~NFS_CAP_ACLS;
188 case -ENOTSUPP:
189 status = -EOPNOTSUPP;
190 }
Trond Myklebust6e94d622010-04-16 16:22:52 -0400191 nfs_free_fattr(fattr);
Trond Myklebustae461412009-03-10 20:33:18 -0400192out_freepages:
193 while (args.npages != 0) {
194 args.npages--;
195 __free_page(args.pages[args.npages]);
196 }
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +0000197out:
198 return status;
199}
200
Trond Myklebust8f493b92014-02-02 14:36:42 -0500201int nfs3_proc_setacls(struct inode *inode, struct posix_acl *acl,
202 struct posix_acl *dfacl)
203{
204 int ret;
205 ret = __nfs3_proc_setacls(inode, acl, dfacl);
206 return (ret == -EOPNOTSUPP) ? 0 : ret;
207
208}
209
Christoph Hellwig013cdf12013-12-20 05:16:53 -0800210int nfs3_set_acl(struct inode *inode, struct posix_acl *acl, int type)
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +0000211{
212 struct posix_acl *alloc = NULL, *dfacl = NULL;
213 int status;
214
215 if (S_ISDIR(inode->i_mode)) {
216 switch(type) {
Christoph Hellwig013cdf12013-12-20 05:16:53 -0800217 case ACL_TYPE_ACCESS:
218 alloc = dfacl = get_acl(inode, ACL_TYPE_DEFAULT);
219 if (IS_ERR(alloc))
220 goto fail;
221 break;
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +0000222
Christoph Hellwig013cdf12013-12-20 05:16:53 -0800223 case ACL_TYPE_DEFAULT:
224 dfacl = acl;
225 alloc = acl = get_acl(inode, ACL_TYPE_ACCESS);
226 if (IS_ERR(alloc))
227 goto fail;
228 break;
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +0000229 }
Christoph Hellwig013cdf12013-12-20 05:16:53 -0800230 }
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +0000231
232 if (acl == NULL) {
233 alloc = acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
234 if (IS_ERR(alloc))
235 goto fail;
236 }
Trond Myklebust8f493b92014-02-02 14:36:42 -0500237 status = __nfs3_proc_setacls(inode, acl, dfacl);
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +0000238 posix_acl_release(alloc);
239 return status;
240
241fail:
242 return PTR_ERR(alloc);
243}
Andreas Gruenbacher055ffbe2005-06-22 17:16:27 +0000244
Christoph Hellwig013cdf12013-12-20 05:16:53 -0800245const struct xattr_handler *nfs3_xattr_handlers[] = {
246 &posix_acl_access_xattr_handler,
247 &posix_acl_default_xattr_handler,
248 NULL,
249};