1 #include <linux/fs.h> 2 #include <linux/nfs.h> 3 #include <linux/nfs3.h> 4 #include <linux/nfs_fs.h> 5 #include <linux/posix_acl_xattr.h> 6 #include <linux/nfsacl.h> 7 8 #define NFSDBG_FACILITY NFSDBG_PROC 9 10 ssize_t nfs3_listxattr(struct dentry *dentry, char *buffer, size_t size) 11 { 12 struct inode *inode = dentry->d_inode; 13 struct posix_acl *acl; 14 int pos=0, len=0; 15 16 # define output(s) do { \ 17 if (pos + sizeof(s) <= size) { \ 18 memcpy(buffer + pos, s, sizeof(s)); \ 19 pos += sizeof(s); \ 20 } \ 21 len += sizeof(s); \ 22 } while(0) 23 24 acl = nfs3_proc_getacl(inode, ACL_TYPE_ACCESS); 25 if (IS_ERR(acl)) 26 return PTR_ERR(acl); 27 if (acl) { 28 output("system.posix_acl_access"); 29 posix_acl_release(acl); 30 } 31 32 if (S_ISDIR(inode->i_mode)) { 33 acl = nfs3_proc_getacl(inode, ACL_TYPE_DEFAULT); 34 if (IS_ERR(acl)) 35 return PTR_ERR(acl); 36 if (acl) { 37 output("system.posix_acl_default"); 38 posix_acl_release(acl); 39 } 40 } 41 42 # undef output 43 44 if (!buffer || len <= size) 45 return len; 46 return -ERANGE; 47 } 48 49 ssize_t nfs3_getxattr(struct dentry *dentry, const char *name, 50 void *buffer, size_t size) 51 { 52 struct inode *inode = dentry->d_inode; 53 struct posix_acl *acl; 54 int type, error = 0; 55 56 if (strcmp(name, POSIX_ACL_XATTR_ACCESS) == 0) 57 type = ACL_TYPE_ACCESS; 58 else if (strcmp(name, POSIX_ACL_XATTR_DEFAULT) == 0) 59 type = ACL_TYPE_DEFAULT; 60 else 61 return -EOPNOTSUPP; 62 63 acl = nfs3_proc_getacl(inode, type); 64 if (IS_ERR(acl)) 65 return PTR_ERR(acl); 66 else if (acl) { 67 if (type == ACL_TYPE_ACCESS && acl->a_count == 0) 68 error = -ENODATA; 69 else 70 error = posix_acl_to_xattr(acl, buffer, size); 71 posix_acl_release(acl); 72 } else 73 error = -ENODATA; 74 75 return error; 76 } 77 78 int nfs3_setxattr(struct dentry *dentry, const char *name, 79 const void *value, size_t size, int flags) 80 { 81 struct inode *inode = dentry->d_inode; 82 struct posix_acl *acl; 83 int type, error; 84 85 if (strcmp(name, POSIX_ACL_XATTR_ACCESS) == 0) 86 type = ACL_TYPE_ACCESS; 87 else if (strcmp(name, POSIX_ACL_XATTR_DEFAULT) == 0) 88 type = ACL_TYPE_DEFAULT; 89 else 90 return -EOPNOTSUPP; 91 92 acl = posix_acl_from_xattr(value, size); 93 if (IS_ERR(acl)) 94 return PTR_ERR(acl); 95 error = nfs3_proc_setacl(inode, type, acl); 96 posix_acl_release(acl); 97 98 return error; 99 } 100 101 int nfs3_removexattr(struct dentry *dentry, const char *name) 102 { 103 struct inode *inode = dentry->d_inode; 104 int type; 105 106 if (strcmp(name, POSIX_ACL_XATTR_ACCESS) == 0) 107 type = ACL_TYPE_ACCESS; 108 else if (strcmp(name, POSIX_ACL_XATTR_DEFAULT) == 0) 109 type = ACL_TYPE_DEFAULT; 110 else 111 return -EOPNOTSUPP; 112 113 return nfs3_proc_setacl(inode, type, NULL); 114 } 115 116 static void __nfs3_forget_cached_acls(struct nfs_inode *nfsi) 117 { 118 if (!IS_ERR(nfsi->acl_access)) { 119 posix_acl_release(nfsi->acl_access); 120 nfsi->acl_access = ERR_PTR(-EAGAIN); 121 } 122 if (!IS_ERR(nfsi->acl_default)) { 123 posix_acl_release(nfsi->acl_default); 124 nfsi->acl_default = ERR_PTR(-EAGAIN); 125 } 126 } 127 128 void nfs3_forget_cached_acls(struct inode *inode) 129 { 130 dprintk("NFS: nfs3_forget_cached_acls(%s/%ld)\n", inode->i_sb->s_id, 131 inode->i_ino); 132 spin_lock(&inode->i_lock); 133 __nfs3_forget_cached_acls(NFS_I(inode)); 134 spin_unlock(&inode->i_lock); 135 } 136 137 static struct posix_acl *nfs3_get_cached_acl(struct inode *inode, int type) 138 { 139 struct nfs_inode *nfsi = NFS_I(inode); 140 struct posix_acl *acl = ERR_PTR(-EINVAL); 141 142 spin_lock(&inode->i_lock); 143 switch(type) { 144 case ACL_TYPE_ACCESS: 145 acl = nfsi->acl_access; 146 break; 147 148 case ACL_TYPE_DEFAULT: 149 acl = nfsi->acl_default; 150 break; 151 152 default: 153 goto out; 154 } 155 if (IS_ERR(acl)) 156 acl = ERR_PTR(-EAGAIN); 157 else 158 acl = posix_acl_dup(acl); 159 out: 160 spin_unlock(&inode->i_lock); 161 dprintk("NFS: nfs3_get_cached_acl(%s/%ld, %d) = %p\n", inode->i_sb->s_id, 162 inode->i_ino, type, acl); 163 return acl; 164 } 165 166 static void nfs3_cache_acls(struct inode *inode, struct posix_acl *acl, 167 struct posix_acl *dfacl) 168 { 169 struct nfs_inode *nfsi = NFS_I(inode); 170 171 dprintk("nfs3_cache_acls(%s/%ld, %p, %p)\n", inode->i_sb->s_id, 172 inode->i_ino, acl, dfacl); 173 spin_lock(&inode->i_lock); 174 __nfs3_forget_cached_acls(NFS_I(inode)); 175 nfsi->acl_access = posix_acl_dup(acl); 176 nfsi->acl_default = posix_acl_dup(dfacl); 177 spin_unlock(&inode->i_lock); 178 } 179 180 struct posix_acl *nfs3_proc_getacl(struct inode *inode, int type) 181 { 182 struct nfs_server *server = NFS_SERVER(inode); 183 struct nfs_fattr fattr; 184 struct page *pages[NFSACL_MAXPAGES] = { }; 185 struct nfs3_getaclargs args = { 186 .fh = NFS_FH(inode), 187 /* The xdr layer may allocate pages here. */ 188 .pages = pages, 189 }; 190 struct nfs3_getaclres res = { 191 .fattr = &fattr, 192 }; 193 struct rpc_message msg = { 194 .rpc_argp = &args, 195 .rpc_resp = &res, 196 }; 197 struct posix_acl *acl; 198 int status, count; 199 200 if (!nfs_server_capable(inode, NFS_CAP_ACLS)) 201 return ERR_PTR(-EOPNOTSUPP); 202 203 status = nfs_revalidate_inode(server, inode); 204 if (status < 0) 205 return ERR_PTR(status); 206 acl = nfs3_get_cached_acl(inode, type); 207 if (acl != ERR_PTR(-EAGAIN)) 208 return acl; 209 acl = NULL; 210 211 /* 212 * Only get the access acl when explicitly requested: We don't 213 * need it for access decisions, and only some applications use 214 * it. Applications which request the access acl first are not 215 * penalized from this optimization. 216 */ 217 if (type == ACL_TYPE_ACCESS) 218 args.mask |= NFS_ACLCNT|NFS_ACL; 219 if (S_ISDIR(inode->i_mode)) 220 args.mask |= NFS_DFACLCNT|NFS_DFACL; 221 if (args.mask == 0) 222 return NULL; 223 224 dprintk("NFS call getacl\n"); 225 msg.rpc_proc = &server->client_acl->cl_procinfo[ACLPROC3_GETACL]; 226 status = rpc_call_sync(server->client_acl, &msg, 0); 227 dprintk("NFS reply getacl: %d\n", status); 228 229 /* pages may have been allocated at the xdr layer. */ 230 for (count = 0; count < NFSACL_MAXPAGES && args.pages[count]; count++) 231 __free_page(args.pages[count]); 232 233 switch (status) { 234 case 0: 235 status = nfs_refresh_inode(inode, &fattr); 236 break; 237 case -EPFNOSUPPORT: 238 case -EPROTONOSUPPORT: 239 dprintk("NFS_V3_ACL extension not supported; disabling\n"); 240 server->caps &= ~NFS_CAP_ACLS; 241 case -ENOTSUPP: 242 status = -EOPNOTSUPP; 243 default: 244 goto getout; 245 } 246 if ((args.mask & res.mask) != args.mask) { 247 status = -EIO; 248 goto getout; 249 } 250 251 if (res.acl_access != NULL) { 252 if (posix_acl_equiv_mode(res.acl_access, NULL) == 0) { 253 posix_acl_release(res.acl_access); 254 res.acl_access = NULL; 255 } 256 } 257 nfs3_cache_acls(inode, res.acl_access, res.acl_default); 258 259 switch(type) { 260 case ACL_TYPE_ACCESS: 261 acl = res.acl_access; 262 res.acl_access = NULL; 263 break; 264 265 case ACL_TYPE_DEFAULT: 266 acl = res.acl_default; 267 res.acl_default = NULL; 268 } 269 270 getout: 271 posix_acl_release(res.acl_access); 272 posix_acl_release(res.acl_default); 273 274 if (status != 0) { 275 posix_acl_release(acl); 276 acl = ERR_PTR(status); 277 } 278 return acl; 279 } 280 281 static int nfs3_proc_setacls(struct inode *inode, struct posix_acl *acl, 282 struct posix_acl *dfacl) 283 { 284 struct nfs_server *server = NFS_SERVER(inode); 285 struct nfs_fattr fattr; 286 struct page *pages[NFSACL_MAXPAGES] = { }; 287 struct nfs3_setaclargs args = { 288 .inode = inode, 289 .mask = NFS_ACL, 290 .acl_access = acl, 291 .pages = pages, 292 }; 293 struct rpc_message msg = { 294 .rpc_argp = &args, 295 .rpc_resp = &fattr, 296 }; 297 int status, count; 298 299 status = -EOPNOTSUPP; 300 if (!nfs_server_capable(inode, NFS_CAP_ACLS)) 301 goto out; 302 303 /* We are doing this here, because XDR marshalling can only 304 return -ENOMEM. */ 305 status = -ENOSPC; 306 if (acl != NULL && acl->a_count > NFS_ACL_MAX_ENTRIES) 307 goto out; 308 if (dfacl != NULL && dfacl->a_count > NFS_ACL_MAX_ENTRIES) 309 goto out; 310 if (S_ISDIR(inode->i_mode)) { 311 args.mask |= NFS_DFACL; 312 args.acl_default = dfacl; 313 } 314 315 dprintk("NFS call setacl\n"); 316 nfs_begin_data_update(inode); 317 msg.rpc_proc = &server->client_acl->cl_procinfo[ACLPROC3_SETACL]; 318 status = rpc_call_sync(server->client_acl, &msg, 0); 319 spin_lock(&inode->i_lock); 320 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ACCESS; 321 spin_unlock(&inode->i_lock); 322 nfs_end_data_update(inode); 323 dprintk("NFS reply setacl: %d\n", status); 324 325 /* pages may have been allocated at the xdr layer. */ 326 for (count = 0; count < NFSACL_MAXPAGES && args.pages[count]; count++) 327 __free_page(args.pages[count]); 328 329 switch (status) { 330 case 0: 331 status = nfs_refresh_inode(inode, &fattr); 332 break; 333 case -EPFNOSUPPORT: 334 case -EPROTONOSUPPORT: 335 dprintk("NFS_V3_ACL SETACL RPC not supported" 336 "(will not retry)\n"); 337 server->caps &= ~NFS_CAP_ACLS; 338 case -ENOTSUPP: 339 status = -EOPNOTSUPP; 340 } 341 out: 342 return status; 343 } 344 345 int nfs3_proc_setacl(struct inode *inode, int type, struct posix_acl *acl) 346 { 347 struct posix_acl *alloc = NULL, *dfacl = NULL; 348 int status; 349 350 if (S_ISDIR(inode->i_mode)) { 351 switch(type) { 352 case ACL_TYPE_ACCESS: 353 alloc = dfacl = nfs3_proc_getacl(inode, 354 ACL_TYPE_DEFAULT); 355 if (IS_ERR(alloc)) 356 goto fail; 357 break; 358 359 case ACL_TYPE_DEFAULT: 360 dfacl = acl; 361 alloc = acl = nfs3_proc_getacl(inode, 362 ACL_TYPE_ACCESS); 363 if (IS_ERR(alloc)) 364 goto fail; 365 break; 366 367 default: 368 return -EINVAL; 369 } 370 } else if (type != ACL_TYPE_ACCESS) 371 return -EINVAL; 372 373 if (acl == NULL) { 374 alloc = acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL); 375 if (IS_ERR(alloc)) 376 goto fail; 377 } 378 status = nfs3_proc_setacls(inode, acl, dfacl); 379 posix_acl_release(alloc); 380 return status; 381 382 fail: 383 return PTR_ERR(alloc); 384 } 385 386 int nfs3_proc_set_default_acl(struct inode *dir, struct inode *inode, 387 mode_t mode) 388 { 389 struct posix_acl *dfacl, *acl; 390 int error = 0; 391 392 dfacl = nfs3_proc_getacl(dir, ACL_TYPE_DEFAULT); 393 if (IS_ERR(dfacl)) { 394 error = PTR_ERR(dfacl); 395 return (error == -EOPNOTSUPP) ? 0 : error; 396 } 397 if (!dfacl) 398 return 0; 399 acl = posix_acl_clone(dfacl, GFP_KERNEL); 400 error = -ENOMEM; 401 if (!acl) 402 goto out_release_dfacl; 403 error = posix_acl_create_masq(acl, &mode); 404 if (error < 0) 405 goto out_release_acl; 406 error = nfs3_proc_setacls(inode, acl, S_ISDIR(inode->i_mode) ? 407 dfacl : NULL); 408 out_release_acl: 409 posix_acl_release(acl); 410 out_release_dfacl: 411 posix_acl_release(dfacl); 412 return error; 413 } 414