blob: 658e586ca438bc2964c0edc75242a373c2239f50 [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"
Trond Myklebust3fc3edf2014-09-25 16:28:53 -040010#include "nfs3_fs.h"
Trond Myklebustf41f7412008-06-11 17:39:04 -040011
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +000012#define NFSDBG_FACILITY NFSDBG_PROC
13
Christoph Hellwig013cdf12013-12-20 05:16:53 -080014struct posix_acl *nfs3_get_acl(struct inode *inode, int type)
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +000015{
16 struct nfs_server *server = NFS_SERVER(inode);
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +000017 struct page *pages[NFSACL_MAXPAGES] = { };
18 struct nfs3_getaclargs args = {
19 .fh = NFS_FH(inode),
20 /* The xdr layer may allocate pages here. */
21 .pages = pages,
22 };
23 struct nfs3_getaclres res = {
Trond Myklebust17280172012-03-11 13:11:00 -040024 NULL,
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +000025 };
Chuck Leverdead28d2006-03-20 13:44:23 -050026 struct rpc_message msg = {
27 .rpc_argp = &args,
28 .rpc_resp = &res,
29 };
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +000030 int status, count;
31
32 if (!nfs_server_capable(inode, NFS_CAP_ACLS))
33 return ERR_PTR(-EOPNOTSUPP);
34
Andreas Gruenbacher5c6a9f72005-06-22 17:16:27 +000035 status = nfs_revalidate_inode(server, inode);
36 if (status < 0)
37 return ERR_PTR(status);
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +000038
Andreas Gruenbacher5c6a9f72005-06-22 17:16:27 +000039 /*
40 * Only get the access acl when explicitly requested: We don't
41 * need it for access decisions, and only some applications use
42 * it. Applications which request the access acl first are not
43 * penalized from this optimization.
44 */
45 if (type == ACL_TYPE_ACCESS)
46 args.mask |= NFS_ACLCNT|NFS_ACL;
47 if (S_ISDIR(inode->i_mode))
48 args.mask |= NFS_DFACLCNT|NFS_DFACL;
49 if (args.mask == 0)
50 return NULL;
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +000051
52 dprintk("NFS call getacl\n");
Chuck Leverdead28d2006-03-20 13:44:23 -050053 msg.rpc_proc = &server->client_acl->cl_procinfo[ACLPROC3_GETACL];
Trond Myklebust6e94d622010-04-16 16:22:52 -040054 res.fattr = nfs_alloc_fattr();
55 if (res.fattr == NULL)
56 return ERR_PTR(-ENOMEM);
57
Chuck Leverdead28d2006-03-20 13:44:23 -050058 status = rpc_call_sync(server->client_acl, &msg, 0);
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +000059 dprintk("NFS reply getacl: %d\n", status);
60
61 /* pages may have been allocated at the xdr layer. */
62 for (count = 0; count < NFSACL_MAXPAGES && args.pages[count]; count++)
63 __free_page(args.pages[count]);
64
65 switch (status) {
66 case 0:
Trond Myklebust6e94d622010-04-16 16:22:52 -040067 status = nfs_refresh_inode(inode, res.fattr);
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +000068 break;
69 case -EPFNOSUPPORT:
70 case -EPROTONOSUPPORT:
71 dprintk("NFS_V3_ACL extension not supported; disabling\n");
72 server->caps &= ~NFS_CAP_ACLS;
73 case -ENOTSUPP:
74 status = -EOPNOTSUPP;
75 default:
76 goto getout;
77 }
78 if ((args.mask & res.mask) != args.mask) {
79 status = -EIO;
80 goto getout;
81 }
82
83 if (res.acl_access != NULL) {
Noah Massey718360c2014-01-30 21:31:12 -050084 if ((posix_acl_equiv_mode(res.acl_access, NULL) == 0) ||
Christoph Hellwig013cdf12013-12-20 05:16:53 -080085 res.acl_access->a_count == 0) {
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +000086 posix_acl_release(res.acl_access);
87 res.acl_access = NULL;
88 }
89 }
90
Christoph Hellwig013cdf12013-12-20 05:16:53 -080091 if (res.mask & NFS_ACL)
92 set_cached_acl(inode, ACL_TYPE_ACCESS, res.acl_access);
93 else
94 forget_cached_acl(inode, ACL_TYPE_ACCESS);
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +000095
Christoph Hellwig013cdf12013-12-20 05:16:53 -080096 if (res.mask & NFS_DFACL)
97 set_cached_acl(inode, ACL_TYPE_DEFAULT, res.acl_default);
98 else
99 forget_cached_acl(inode, ACL_TYPE_DEFAULT);
100
101 nfs_free_fattr(res.fattr);
102 if (type == ACL_TYPE_ACCESS) {
103 posix_acl_release(res.acl_default);
104 return res.acl_access;
105 } else {
106 posix_acl_release(res.acl_access);
107 return res.acl_default;
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +0000108 }
109
110getout:
111 posix_acl_release(res.acl_access);
112 posix_acl_release(res.acl_default);
Trond Myklebust6e94d622010-04-16 16:22:52 -0400113 nfs_free_fattr(res.fattr);
Christoph Hellwig013cdf12013-12-20 05:16:53 -0800114 return ERR_PTR(status);
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +0000115}
116
Trond Myklebust8f493b92014-02-02 14:36:42 -0500117static int __nfs3_proc_setacls(struct inode *inode, struct posix_acl *acl,
Christoph Hellwig013cdf12013-12-20 05:16:53 -0800118 struct posix_acl *dfacl)
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +0000119{
120 struct nfs_server *server = NFS_SERVER(inode);
Trond Myklebust6e94d622010-04-16 16:22:52 -0400121 struct nfs_fattr *fattr;
Trond Myklebustae461412009-03-10 20:33:18 -0400122 struct page *pages[NFSACL_MAXPAGES];
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +0000123 struct nfs3_setaclargs args = {
124 .inode = inode,
125 .mask = NFS_ACL,
126 .acl_access = acl,
127 .pages = pages,
128 };
Chuck Leverdead28d2006-03-20 13:44:23 -0500129 struct rpc_message msg = {
130 .rpc_argp = &args,
131 .rpc_resp = &fattr,
132 };
Trond Myklebustf87d928f2014-08-24 14:46:48 -0400133 int status = 0;
134
135 if (acl == NULL && (!S_ISDIR(inode->i_mode) || dfacl == NULL))
136 goto out;
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +0000137
138 status = -EOPNOTSUPP;
139 if (!nfs_server_capable(inode, NFS_CAP_ACLS))
140 goto out;
141
Chuck Leverf61f6da2011-01-21 03:05:38 +0000142 /* We are doing this here because XDR marshalling does not
143 * return any results, it BUGs. */
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +0000144 status = -ENOSPC;
145 if (acl != NULL && acl->a_count > NFS_ACL_MAX_ENTRIES)
146 goto out;
147 if (dfacl != NULL && dfacl->a_count > NFS_ACL_MAX_ENTRIES)
148 goto out;
149 if (S_ISDIR(inode->i_mode)) {
150 args.mask |= NFS_DFACL;
151 args.acl_default = dfacl;
Trond Myklebustae461412009-03-10 20:33:18 -0400152 args.len = nfsacl_size(acl, dfacl);
153 } else
154 args.len = nfsacl_size(acl, NULL);
155
156 if (args.len > NFS_ACL_INLINE_BUFSIZE) {
157 unsigned int npages = 1 + ((args.len - 1) >> PAGE_SHIFT);
158
159 status = -ENOMEM;
160 do {
161 args.pages[args.npages] = alloc_page(GFP_KERNEL);
162 if (args.pages[args.npages] == NULL)
163 goto out_freepages;
164 args.npages++;
165 } while (args.npages < npages);
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +0000166 }
167
168 dprintk("NFS call setacl\n");
Trond Myklebust6e94d622010-04-16 16:22:52 -0400169 status = -ENOMEM;
170 fattr = nfs_alloc_fattr();
171 if (fattr == NULL)
172 goto out_freepages;
173
Chuck Leverdead28d2006-03-20 13:44:23 -0500174 msg.rpc_proc = &server->client_acl->cl_procinfo[ACLPROC3_SETACL];
Trond Myklebust6e94d622010-04-16 16:22:52 -0400175 msg.rpc_resp = fattr;
Chuck Leverdead28d2006-03-20 13:44:23 -0500176 status = rpc_call_sync(server->client_acl, &msg, 0);
Trond Myklebustf41f7412008-06-11 17:39:04 -0400177 nfs_access_zap_cache(inode);
178 nfs_zap_acl_cache(inode);
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +0000179 dprintk("NFS reply setacl: %d\n", status);
180
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +0000181 switch (status) {
182 case 0:
Trond Myklebust6e94d622010-04-16 16:22:52 -0400183 status = nfs_refresh_inode(inode, fattr);
Christoph Hellwig013cdf12013-12-20 05:16:53 -0800184 set_cached_acl(inode, ACL_TYPE_ACCESS, acl);
185 set_cached_acl(inode, ACL_TYPE_DEFAULT, dfacl);
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +0000186 break;
187 case -EPFNOSUPPORT:
188 case -EPROTONOSUPPORT:
189 dprintk("NFS_V3_ACL SETACL RPC not supported"
190 "(will not retry)\n");
191 server->caps &= ~NFS_CAP_ACLS;
192 case -ENOTSUPP:
193 status = -EOPNOTSUPP;
194 }
Trond Myklebust6e94d622010-04-16 16:22:52 -0400195 nfs_free_fattr(fattr);
Trond Myklebustae461412009-03-10 20:33:18 -0400196out_freepages:
197 while (args.npages != 0) {
198 args.npages--;
199 __free_page(args.pages[args.npages]);
200 }
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +0000201out:
202 return status;
203}
204
Trond Myklebust8f493b92014-02-02 14:36:42 -0500205int nfs3_proc_setacls(struct inode *inode, struct posix_acl *acl,
206 struct posix_acl *dfacl)
207{
208 int ret;
209 ret = __nfs3_proc_setacls(inode, acl, dfacl);
210 return (ret == -EOPNOTSUPP) ? 0 : ret;
211
212}
213
Christoph Hellwig013cdf12013-12-20 05:16:53 -0800214int nfs3_set_acl(struct inode *inode, struct posix_acl *acl, int type)
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +0000215{
216 struct posix_acl *alloc = NULL, *dfacl = NULL;
217 int status;
218
219 if (S_ISDIR(inode->i_mode)) {
220 switch(type) {
Christoph Hellwig013cdf12013-12-20 05:16:53 -0800221 case ACL_TYPE_ACCESS:
222 alloc = dfacl = get_acl(inode, ACL_TYPE_DEFAULT);
223 if (IS_ERR(alloc))
224 goto fail;
225 break;
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +0000226
Christoph Hellwig013cdf12013-12-20 05:16:53 -0800227 case ACL_TYPE_DEFAULT:
228 dfacl = acl;
229 alloc = acl = get_acl(inode, ACL_TYPE_ACCESS);
230 if (IS_ERR(alloc))
231 goto fail;
232 break;
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +0000233 }
Christoph Hellwig013cdf12013-12-20 05:16:53 -0800234 }
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +0000235
236 if (acl == NULL) {
237 alloc = acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
238 if (IS_ERR(alloc))
239 goto fail;
240 }
Trond Myklebust8f493b92014-02-02 14:36:42 -0500241 status = __nfs3_proc_setacls(inode, acl, dfacl);
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +0000242 posix_acl_release(alloc);
243 return status;
244
245fail:
246 return PTR_ERR(alloc);
247}
Andreas Gruenbacher055ffbe2005-06-22 17:16:27 +0000248
Christoph Hellwig013cdf12013-12-20 05:16:53 -0800249const struct xattr_handler *nfs3_xattr_handlers[] = {
250 &posix_acl_access_xattr_handler,
251 &posix_acl_default_xattr_handler,
252 NULL,
253};
Christoph Hellwig74adf832014-06-18 11:07:03 +0200254
255static int
256nfs3_list_one_acl(struct inode *inode, int type, const char *name, void *data,
257 size_t size, ssize_t *result)
258{
259 struct posix_acl *acl;
260 char *p = data + *result;
261
262 acl = get_acl(inode, type);
Andrey Utkin7a9e75a2014-07-26 14:58:01 +0300263 if (IS_ERR_OR_NULL(acl))
Christoph Hellwig74adf832014-06-18 11:07:03 +0200264 return 0;
265
266 posix_acl_release(acl);
267
268 *result += strlen(name);
269 *result += 1;
270 if (!size)
271 return 0;
272 if (*result > size)
273 return -ERANGE;
274
275 strcpy(p, name);
276 return 0;
277}
278
279ssize_t
280nfs3_listxattr(struct dentry *dentry, char *data, size_t size)
281{
282 struct inode *inode = dentry->d_inode;
283 ssize_t result = 0;
284 int error;
285
286 error = nfs3_list_one_acl(inode, ACL_TYPE_ACCESS,
287 POSIX_ACL_XATTR_ACCESS, data, size, &result);
288 if (error)
289 return error;
290
291 error = nfs3_list_one_acl(inode, ACL_TYPE_DEFAULT,
292 POSIX_ACL_XATTR_DEFAULT, data, size, &result);
293 if (error)
294 return error;
295 return result;
296}