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Linux/fs/nfsd/nfs3acl.c

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

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