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Merge tag 'arc-4.6-rc6-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc
[mirror_ubuntu-bionic-kernel.git] / fs / nfsd / nfs3acl.c
1 /*
2 * Process version 3 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 RETURN_STATUS(st) { resp->status = (st); return (st); }
16
17 /*
18 * NULL call.
19 */
20 static __be32
21 nfsd3_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
22 {
23 return nfs_ok;
24 }
25
26 /*
27 * Get the Access and/or Default ACL of a file.
28 */
29 static __be32 nfsd3_proc_getacl(struct svc_rqst * rqstp,
30 struct nfsd3_getaclargs *argp, struct nfsd3_getaclres *resp)
31 {
32 struct posix_acl *acl;
33 struct inode *inode;
34 svc_fh *fh;
35 __be32 nfserr = 0;
36
37 fh = fh_copy(&resp->fh, &argp->fh);
38 nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP);
39 if (nfserr)
40 RETURN_STATUS(nfserr);
41
42 inode = d_inode(fh->fh_dentry);
43
44 if (argp->mask & ~NFS_ACL_MASK)
45 RETURN_STATUS(nfserr_inval);
46 resp->mask = argp->mask;
47
48 if (resp->mask & (NFS_ACL|NFS_ACLCNT)) {
49 acl = get_acl(inode, ACL_TYPE_ACCESS);
50 if (acl == NULL) {
51 /* Solaris returns the inode's minimum ACL. */
52 acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
53 }
54 if (IS_ERR(acl)) {
55 nfserr = nfserrno(PTR_ERR(acl));
56 goto fail;
57 }
58 resp->acl_access = acl;
59 }
60 if (resp->mask & (NFS_DFACL|NFS_DFACLCNT)) {
61 /* Check how Solaris handles requests for the Default ACL
62 of a non-directory! */
63 acl = get_acl(inode, ACL_TYPE_DEFAULT);
64 if (IS_ERR(acl)) {
65 nfserr = nfserrno(PTR_ERR(acl));
66 goto fail;
67 }
68 resp->acl_default = acl;
69 }
70
71 /* resp->acl_{access,default} are released in nfs3svc_release_getacl. */
72 RETURN_STATUS(0);
73
74 fail:
75 posix_acl_release(resp->acl_access);
76 posix_acl_release(resp->acl_default);
77 RETURN_STATUS(nfserr);
78 }
79
80 /*
81 * Set the Access and/or Default ACL of a file.
82 */
83 static __be32 nfsd3_proc_setacl(struct svc_rqst * rqstp,
84 struct nfsd3_setaclargs *argp,
85 struct nfsd3_attrstat *resp)
86 {
87 struct inode *inode;
88 svc_fh *fh;
89 __be32 nfserr = 0;
90 int error;
91
92 fh = fh_copy(&resp->fh, &argp->fh);
93 nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_SATTR);
94 if (nfserr)
95 goto out;
96
97 inode = d_inode(fh->fh_dentry);
98 if (!IS_POSIXACL(inode) || !inode->i_op->set_acl) {
99 error = -EOPNOTSUPP;
100 goto out_errno;
101 }
102
103 error = fh_want_write(fh);
104 if (error)
105 goto out_errno;
106
107 error = inode->i_op->set_acl(inode, argp->acl_access, ACL_TYPE_ACCESS);
108 if (error)
109 goto out_drop_write;
110 error = inode->i_op->set_acl(inode, argp->acl_default,
111 ACL_TYPE_DEFAULT);
112
113 out_drop_write:
114 fh_drop_write(fh);
115 out_errno:
116 nfserr = nfserrno(error);
117 out:
118 /* argp->acl_{access,default} may have been allocated in
119 nfs3svc_decode_setaclargs. */
120 posix_acl_release(argp->acl_access);
121 posix_acl_release(argp->acl_default);
122 RETURN_STATUS(nfserr);
123 }
124
125 /*
126 * XDR decode functions
127 */
128 static int nfs3svc_decode_getaclargs(struct svc_rqst *rqstp, __be32 *p,
129 struct nfsd3_getaclargs *args)
130 {
131 p = nfs3svc_decode_fh(p, &args->fh);
132 if (!p)
133 return 0;
134 args->mask = ntohl(*p); p++;
135
136 return xdr_argsize_check(rqstp, p);
137 }
138
139
140 static int nfs3svc_decode_setaclargs(struct svc_rqst *rqstp, __be32 *p,
141 struct nfsd3_setaclargs *args)
142 {
143 struct kvec *head = rqstp->rq_arg.head;
144 unsigned int base;
145 int n;
146
147 p = nfs3svc_decode_fh(p, &args->fh);
148 if (!p)
149 return 0;
150 args->mask = ntohl(*p++);
151 if (args->mask & ~NFS_ACL_MASK ||
152 !xdr_argsize_check(rqstp, p))
153 return 0;
154
155 base = (char *)p - (char *)head->iov_base;
156 n = nfsacl_decode(&rqstp->rq_arg, base, NULL,
157 (args->mask & NFS_ACL) ?
158 &args->acl_access : NULL);
159 if (n > 0)
160 n = nfsacl_decode(&rqstp->rq_arg, base + n, NULL,
161 (args->mask & NFS_DFACL) ?
162 &args->acl_default : NULL);
163 return (n > 0);
164 }
165
166 /*
167 * XDR encode functions
168 */
169
170 /* GETACL */
171 static int nfs3svc_encode_getaclres(struct svc_rqst *rqstp, __be32 *p,
172 struct nfsd3_getaclres *resp)
173 {
174 struct dentry *dentry = resp->fh.fh_dentry;
175
176 p = nfs3svc_encode_post_op_attr(rqstp, p, &resp->fh);
177 if (resp->status == 0 && dentry && d_really_is_positive(dentry)) {
178 struct inode *inode = d_inode(dentry);
179 struct kvec *head = rqstp->rq_res.head;
180 unsigned int base;
181 int n;
182 int w;
183
184 *p++ = htonl(resp->mask);
185 if (!xdr_ressize_check(rqstp, p))
186 return 0;
187 base = (char *)p - (char *)head->iov_base;
188
189 rqstp->rq_res.page_len = w = nfsacl_size(
190 (resp->mask & NFS_ACL) ? resp->acl_access : NULL,
191 (resp->mask & NFS_DFACL) ? resp->acl_default : NULL);
192 while (w > 0) {
193 if (!*(rqstp->rq_next_page++))
194 return 0;
195 w -= PAGE_SIZE;
196 }
197
198 n = nfsacl_encode(&rqstp->rq_res, base, inode,
199 resp->acl_access,
200 resp->mask & NFS_ACL, 0);
201 if (n > 0)
202 n = nfsacl_encode(&rqstp->rq_res, base + n, inode,
203 resp->acl_default,
204 resp->mask & NFS_DFACL,
205 NFS_ACL_DEFAULT);
206 if (n <= 0)
207 return 0;
208 } else
209 if (!xdr_ressize_check(rqstp, p))
210 return 0;
211
212 return 1;
213 }
214
215 /* SETACL */
216 static int nfs3svc_encode_setaclres(struct svc_rqst *rqstp, __be32 *p,
217 struct nfsd3_attrstat *resp)
218 {
219 p = nfs3svc_encode_post_op_attr(rqstp, p, &resp->fh);
220
221 return xdr_ressize_check(rqstp, p);
222 }
223
224 /*
225 * XDR release functions
226 */
227 static int nfs3svc_release_getacl(struct svc_rqst *rqstp, __be32 *p,
228 struct nfsd3_getaclres *resp)
229 {
230 fh_put(&resp->fh);
231 posix_acl_release(resp->acl_access);
232 posix_acl_release(resp->acl_default);
233 return 1;
234 }
235
236 #define nfs3svc_decode_voidargs NULL
237 #define nfs3svc_release_void NULL
238 #define nfsd3_setaclres nfsd3_attrstat
239 #define nfsd3_voidres nfsd3_voidargs
240 struct nfsd3_voidargs { int dummy; };
241
242 #define PROC(name, argt, rest, relt, cache, respsize) \
243 { (svc_procfunc) nfsd3_proc_##name, \
244 (kxdrproc_t) nfs3svc_decode_##argt##args, \
245 (kxdrproc_t) nfs3svc_encode_##rest##res, \
246 (kxdrproc_t) nfs3svc_release_##relt, \
247 sizeof(struct nfsd3_##argt##args), \
248 sizeof(struct nfsd3_##rest##res), \
249 0, \
250 cache, \
251 respsize, \
252 }
253
254 #define ST 1 /* status*/
255 #define AT 21 /* attributes */
256 #define pAT (1+AT) /* post attributes - conditional */
257 #define ACL (1+NFS_ACL_MAX_ENTRIES*3) /* Access Control List */
258
259 static struct svc_procedure nfsd_acl_procedures3[] = {
260 PROC(null, void, void, void, RC_NOCACHE, ST),
261 PROC(getacl, getacl, getacl, getacl, RC_NOCACHE, ST+1+2*(1+ACL)),
262 PROC(setacl, setacl, setacl, fhandle, RC_NOCACHE, ST+pAT),
263 };
264
265 struct svc_version nfsd_acl_version3 = {
266 .vs_vers = 3,
267 .vs_nproc = 3,
268 .vs_proc = nfsd_acl_procedures3,
269 .vs_dispatch = nfsd_dispatch,
270 .vs_xdrsize = NFS3_SVC_XDRSIZE,
271 .vs_hidden = 0,
272 };
273