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Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target...
[linux-btrfs-devel.git] / fs / nfsd / nfs2acl.c
blob6aa5590c3679135279d2731b2af79fd8804b44a2
1 /*
2 * Process version 2 NFSACL requests.
3 *
4 * Copyright (C) 2002-2003 Andreas Gruenbacher <agruen@suse.de>
5 */
6
7 #include "nfsd.h"
8 /* FIXME: nfsacl.h is a broken header */
9 #include <linux/nfsacl.h>
10 #include <linux/gfp.h>
11 #include "cache.h"
12 #include "xdr3.h"
13 #include "vfs.h"
14
15 #define NFSDDBG_FACILITY NFSDDBG_PROC
16 #define RETURN_STATUS(st) { resp->status = (st); return (st); }
17
18 /*
19 * NULL call.
20 */
21 static __be32
22 nfsacld_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
23 {
24 return nfs_ok;
25 }
26
27 /*
28 * Get the Access and/or Default ACL of a file.
29 */
30 static __be32 nfsacld_proc_getacl(struct svc_rqst * rqstp,
31 struct nfsd3_getaclargs *argp, struct nfsd3_getaclres *resp)
32 {
33 svc_fh *fh;
34 struct posix_acl *acl;
35 __be32 nfserr = 0;
36
37 dprintk("nfsd: GETACL(2acl) %s\n", SVCFH_fmt(&argp->fh));
38
39 fh = fh_copy(&resp->fh, &argp->fh);
40 nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP);
41 if (nfserr)
42 RETURN_STATUS(nfserr);
43
44 if (argp->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT))
45 RETURN_STATUS(nfserr_inval);
46 resp->mask = argp->mask;
47
48 if (resp->mask & (NFS_ACL|NFS_ACLCNT)) {
49 acl = nfsd_get_posix_acl(fh, ACL_TYPE_ACCESS);
50 if (IS_ERR(acl)) {
51 int err = PTR_ERR(acl);
52
53 if (err == -ENODATA || err == -EOPNOTSUPP)
54 acl = NULL;
55 else {
56 nfserr = nfserrno(err);
57 goto fail;
58 }
59 }
60 if (acl == NULL) {
61 /* Solaris returns the inode's minimum ACL. */
62
63 struct inode *inode = fh->fh_dentry->d_inode;
64 acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
65 }
66 resp->acl_access = acl;
67 }
68 if (resp->mask & (NFS_DFACL|NFS_DFACLCNT)) {
69 /* Check how Solaris handles requests for the Default ACL
70 of a non-directory! */
71
72 acl = nfsd_get_posix_acl(fh, ACL_TYPE_DEFAULT);
73 if (IS_ERR(acl)) {
74 int err = PTR_ERR(acl);
75
76 if (err == -ENODATA || err == -EOPNOTSUPP)
77 acl = NULL;
78 else {
79 nfserr = nfserrno(err);
80 goto fail;
81 }
82 }
83 resp->acl_default = acl;
84 }
85
86 /* resp->acl_{access,default} are released in nfssvc_release_getacl. */
87 RETURN_STATUS(0);
88
89 fail:
90 posix_acl_release(resp->acl_access);
91 posix_acl_release(resp->acl_default);
92 RETURN_STATUS(nfserr);
93 }
94
95 /*
96 * Set the Access and/or Default ACL of a file.
97 */
98 static __be32 nfsacld_proc_setacl(struct svc_rqst * rqstp,
99 struct nfsd3_setaclargs *argp,
100 struct nfsd_attrstat *resp)
101 {
102 svc_fh *fh;
103 __be32 nfserr = 0;
104
105 dprintk("nfsd: SETACL(2acl) %s\n", SVCFH_fmt(&argp->fh));
106
107 fh = fh_copy(&resp->fh, &argp->fh);
108 nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_SATTR);
109
110 if (!nfserr) {
111 nfserr = nfserrno( nfsd_set_posix_acl(
112 fh, ACL_TYPE_ACCESS, argp->acl_access) );
113 }
114 if (!nfserr) {
115 nfserr = nfserrno( nfsd_set_posix_acl(
116 fh, ACL_TYPE_DEFAULT, argp->acl_default) );
117 }
118
119 /* argp->acl_{access,default} may have been allocated in
120 nfssvc_decode_setaclargs. */
121 posix_acl_release(argp->acl_access);
122 posix_acl_release(argp->acl_default);
123 return nfserr;
124 }
125
126 /*
127 * Check file attributes
128 */
129 static __be32 nfsacld_proc_getattr(struct svc_rqst * rqstp,
130 struct nfsd_fhandle *argp, struct nfsd_attrstat *resp)
131 {
132 dprintk("nfsd: GETATTR %s\n", SVCFH_fmt(&argp->fh));
133
134 fh_copy(&resp->fh, &argp->fh);
135 return fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP);
136 }
137
138 /*
139 * Check file access
140 */
141 static __be32 nfsacld_proc_access(struct svc_rqst *rqstp, struct nfsd3_accessargs *argp,
142 struct nfsd3_accessres *resp)
143 {
144 __be32 nfserr;
145
146 dprintk("nfsd: ACCESS(2acl) %s 0x%x\n",
147 SVCFH_fmt(&argp->fh),
148 argp->access);
149
150 fh_copy(&resp->fh, &argp->fh);
151 resp->access = argp->access;
152 nfserr = nfsd_access(rqstp, &resp->fh, &resp->access, NULL);
153 return nfserr;
154 }
155
156 /*
157 * XDR decode functions
158 */
159 static int nfsaclsvc_decode_getaclargs(struct svc_rqst *rqstp, __be32 *p,
160 struct nfsd3_getaclargs *argp)
161 {
162 if (!(p = nfs2svc_decode_fh(p, &argp->fh)))
163 return 0;
164 argp->mask = ntohl(*p); p++;
165
166 return xdr_argsize_check(rqstp, p);
167 }
168
169
170 static int nfsaclsvc_decode_setaclargs(struct svc_rqst *rqstp, __be32 *p,
171 struct nfsd3_setaclargs *argp)
172 {
173 struct kvec *head = rqstp->rq_arg.head;
174 unsigned int base;
175 int n;
176
177 if (!(p = nfs2svc_decode_fh(p, &argp->fh)))
178 return 0;
179 argp->mask = ntohl(*p++);
180 if (argp->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT) ||
181 !xdr_argsize_check(rqstp, p))
182 return 0;
183
184 base = (char *)p - (char *)head->iov_base;
185 n = nfsacl_decode(&rqstp->rq_arg, base, NULL,
186 (argp->mask & NFS_ACL) ?
187 &argp->acl_access : NULL);
188 if (n > 0)
189 n = nfsacl_decode(&rqstp->rq_arg, base + n, NULL,
190 (argp->mask & NFS_DFACL) ?
191 &argp->acl_default : NULL);
192 return (n > 0);
193 }
194
195 static int nfsaclsvc_decode_fhandleargs(struct svc_rqst *rqstp, __be32 *p,
196 struct nfsd_fhandle *argp)
197 {
198 if (!(p = nfs2svc_decode_fh(p, &argp->fh)))
199 return 0;
200 return xdr_argsize_check(rqstp, p);
201 }
202
203 static int nfsaclsvc_decode_accessargs(struct svc_rqst *rqstp, __be32 *p,
204 struct nfsd3_accessargs *argp)
205 {
206 if (!(p = nfs2svc_decode_fh(p, &argp->fh)))
207 return 0;
208 argp->access = ntohl(*p++);
209
210 return xdr_argsize_check(rqstp, p);
211 }
212
213 /*
214 * XDR encode functions
215 */
216
217 /*
218 * There must be an encoding function for void results so svc_process
219 * will work properly.
220 */
221 int
222 nfsaclsvc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
223 {
224 return xdr_ressize_check(rqstp, p);
225 }
226
227 /* GETACL */
228 static int nfsaclsvc_encode_getaclres(struct svc_rqst *rqstp, __be32 *p,
229 struct nfsd3_getaclres *resp)
230 {
231 struct dentry *dentry = resp->fh.fh_dentry;
232 struct inode *inode;
233 struct kvec *head = rqstp->rq_res.head;
234 unsigned int base;
235 int n;
236 int w;
237
238 /*
239 * Since this is version 2, the check for nfserr in
240 * nfsd_dispatch actually ensures the following cannot happen.
241 * However, it seems fragile to depend on that.
242 */
243 if (dentry == NULL || dentry->d_inode == NULL)
244 return 0;
245 inode = dentry->d_inode;
246
247 p = nfs2svc_encode_fattr(rqstp, p, &resp->fh);
248 *p++ = htonl(resp->mask);
249 if (!xdr_ressize_check(rqstp, p))
250 return 0;
251 base = (char *)p - (char *)head->iov_base;
252
253 rqstp->rq_res.page_len = w = nfsacl_size(
254 (resp->mask & NFS_ACL) ? resp->acl_access : NULL,
255 (resp->mask & NFS_DFACL) ? resp->acl_default : NULL);
256 while (w > 0) {
257 if (!rqstp->rq_respages[rqstp->rq_resused++])
258 return 0;
259 w -= PAGE_SIZE;
260 }
261
262 n = nfsacl_encode(&rqstp->rq_res, base, inode,
263 resp->acl_access,
264 resp->mask & NFS_ACL, 0);
265 if (n > 0)
266 n = nfsacl_encode(&rqstp->rq_res, base + n, inode,
267 resp->acl_default,
268 resp->mask & NFS_DFACL,
269 NFS_ACL_DEFAULT);
270 if (n <= 0)
271 return 0;
272 return 1;
273 }
274
275 static int nfsaclsvc_encode_attrstatres(struct svc_rqst *rqstp, __be32 *p,
276 struct nfsd_attrstat *resp)
277 {
278 p = nfs2svc_encode_fattr(rqstp, p, &resp->fh);
279 return xdr_ressize_check(rqstp, p);
280 }
281
282 /* ACCESS */
283 static int nfsaclsvc_encode_accessres(struct svc_rqst *rqstp, __be32 *p,
284 struct nfsd3_accessres *resp)
285 {
286 p = nfs2svc_encode_fattr(rqstp, p, &resp->fh);
287 *p++ = htonl(resp->access);
288 return xdr_ressize_check(rqstp, p);
289 }
290
291 /*
292 * XDR release functions
293 */
294 static int nfsaclsvc_release_getacl(struct svc_rqst *rqstp, __be32 *p,
295 struct nfsd3_getaclres *resp)
296 {
297 fh_put(&resp->fh);
298 posix_acl_release(resp->acl_access);
299 posix_acl_release(resp->acl_default);
300 return 1;
301 }
302
303 static int nfsaclsvc_release_attrstat(struct svc_rqst *rqstp, __be32 *p,
304 struct nfsd_attrstat *resp)
305 {
306 fh_put(&resp->fh);
307 return 1;
308 }
309
310 static int nfsaclsvc_release_access(struct svc_rqst *rqstp, __be32 *p,
311 struct nfsd3_accessres *resp)
312 {
313 fh_put(&resp->fh);
314 return 1;
315 }
316
317 #define nfsaclsvc_decode_voidargs NULL
318 #define nfsaclsvc_release_void NULL
319 #define nfsd3_fhandleargs nfsd_fhandle
320 #define nfsd3_attrstatres nfsd_attrstat
321 #define nfsd3_voidres nfsd3_voidargs
322 struct nfsd3_voidargs { int dummy; };
323
324 #define PROC(name, argt, rest, relt, cache, respsize) \
325 { (svc_procfunc) nfsacld_proc_##name, \
326 (kxdrproc_t) nfsaclsvc_decode_##argt##args, \
327 (kxdrproc_t) nfsaclsvc_encode_##rest##res, \
328 (kxdrproc_t) nfsaclsvc_release_##relt, \
329 sizeof(struct nfsd3_##argt##args), \
330 sizeof(struct nfsd3_##rest##res), \
331 0, \
332 cache, \
333 respsize, \
334 }
335
336 #define ST 1 /* status*/
337 #define AT 21 /* attributes */
338 #define pAT (1+AT) /* post attributes - conditional */
339 #define ACL (1+NFS_ACL_MAX_ENTRIES*3) /* Access Control List */
340
341 static struct svc_procedure nfsd_acl_procedures2[] = {
342 PROC(null, void, void, void, RC_NOCACHE, ST),
343 PROC(getacl, getacl, getacl, getacl, RC_NOCACHE, ST+1+2*(1+ACL)),
344 PROC(setacl, setacl, attrstat, attrstat, RC_NOCACHE, ST+AT),
345 PROC(getattr, fhandle, attrstat, attrstat, RC_NOCACHE, ST+AT),
346 PROC(access, access, access, access, RC_NOCACHE, ST+AT+1),
347 };
348
349 struct svc_version nfsd_acl_version2 = {
350 .vs_vers = 2,
351 .vs_nproc = 5,
352 .vs_proc = nfsd_acl_procedures2,
353 .vs_dispatch = nfsd_dispatch,
354 .vs_xdrsize = NFS3_SVC_XDRSIZE,
355 .vs_hidden = 0,
356 };
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