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 if (!IS_ERR(acl)) 176 nfsi->acl_access = posix_acl_dup(acl); 177 if (!IS_ERR(dfacl)) 178 nfsi->acl_default = posix_acl_dup(dfacl); 179 spin_unlock(&inode->i_lock); 180 } 181 182 struct posix_acl *nfs3_proc_getacl(struct inode *inode, int type) 183 { 184 struct nfs_server *server = NFS_SERVER(inode); 185 struct nfs_fattr fattr; 186 struct page *pages[NFSACL_MAXPAGES] = { }; 187 struct nfs3_getaclargs args = { 188 .fh = NFS_FH(inode), 189 /* The xdr layer may allocate pages here. */ 190 .pages = pages, 191 }; 192 struct nfs3_getaclres res = { 193 .fattr = &fattr, 194 }; 195 struct rpc_message msg = { 196 .rpc_argp = &args, 197 .rpc_resp = &res, 198 }; 199 struct posix_acl *acl; 200 int status, count; 201 202 if (!nfs_server_capable(inode, NFS_CAP_ACLS)) 203 return ERR_PTR(-EOPNOTSUPP); 204 205 status = nfs_revalidate_inode(server, inode); 206 if (status < 0) 207 return ERR_PTR(status); 208 acl = nfs3_get_cached_acl(inode, type); 209 if (acl != ERR_PTR(-EAGAIN)) 210 return acl; 211 acl = NULL; 212 213 /* 214 * Only get the access acl when explicitly requested: We don't 215 * need it for access decisions, and only some applications use 216 * it. Applications which request the access acl first are not 217 * penalized from this optimization. 218 */ 219 if (type == ACL_TYPE_ACCESS) 220 args.mask |= NFS_ACLCNT|NFS_ACL; 221 if (S_ISDIR(inode->i_mode)) 222 args.mask |= NFS_DFACLCNT|NFS_DFACL; 223 if (args.mask == 0) 224 return NULL; 225 226 dprintk("NFS call getacl\n"); 227 msg.rpc_proc = &server->client_acl->cl_procinfo[ACLPROC3_GETACL]; 228 status = rpc_call_sync(server->client_acl, &msg, 0); 229 dprintk("NFS reply getacl: %d\n", status); 230 231 /* pages may have been allocated at the xdr layer. */ 232 for (count = 0; count < NFSACL_MAXPAGES && args.pages[count]; count++) 233 __free_page(args.pages[count]); 234 235 switch (status) { 236 case 0: 237 status = nfs_refresh_inode(inode, &fattr); 238 break; 239 case -EPFNOSUPPORT: 240 case -EPROTONOSUPPORT: 241 dprintk("NFS_V3_ACL extension not supported; disabling\n"); 242 server->caps &= ~NFS_CAP_ACLS; 243 case -ENOTSUPP: 244 status = -EOPNOTSUPP; 245 default: 246 goto getout; 247 } 248 if ((args.mask & res.mask) != args.mask) { 249 status = -EIO; 250 goto getout; 251 } 252 253 if (res.acl_access != NULL) { 254 if (posix_acl_equiv_mode(res.acl_access, NULL) == 0) { 255 posix_acl_release(res.acl_access); 256 res.acl_access = NULL; 257 } 258 } 259 nfs3_cache_acls(inode, 260 (res.mask & NFS_ACL) ? res.acl_access : ERR_PTR(-EINVAL), 261 (res.mask & NFS_DFACL) ? res.acl_default : ERR_PTR(-EINVAL)); 262 263 switch(type) { 264 case ACL_TYPE_ACCESS: 265 acl = res.acl_access; 266 res.acl_access = NULL; 267 break; 268 269 case ACL_TYPE_DEFAULT: 270 acl = res.acl_default; 271 res.acl_default = NULL; 272 } 273 274 getout: 275 posix_acl_release(res.acl_access); 276 posix_acl_release(res.acl_default); 277 278 if (status != 0) { 279 posix_acl_release(acl); 280 acl = ERR_PTR(status); 281 } 282 return acl; 283 } 284 285 static int nfs3_proc_setacls(struct inode *inode, struct posix_acl *acl, 286 struct posix_acl *dfacl) 287 { 288 struct nfs_server *server = NFS_SERVER(inode); 289 struct nfs_fattr fattr; 290 struct page *pages[NFSACL_MAXPAGES] = { }; 291 struct nfs3_setaclargs args = { 292 .inode = inode, 293 .mask = NFS_ACL, 294 .acl_access = acl, 295 .pages = pages, 296 }; 297 struct rpc_message msg = { 298 .rpc_argp = &args, 299 .rpc_resp = &fattr, 300 }; 301 int status, count; 302 303 status = -EOPNOTSUPP; 304 if (!nfs_server_capable(inode, NFS_CAP_ACLS)) 305 goto out; 306 307 /* We are doing this here, because XDR marshalling can only 308 return -ENOMEM. */ 309 status = -ENOSPC; 310 if (acl != NULL && acl->a_count > NFS_ACL_MAX_ENTRIES) 311 goto out; 312 if (dfacl != NULL && dfacl->a_count > NFS_ACL_MAX_ENTRIES) 313 goto out; 314 if (S_ISDIR(inode->i_mode)) { 315 args.mask |= NFS_DFACL; 316 args.acl_default = dfacl; 317 } 318 319 dprintk("NFS call setacl\n"); 320 msg.rpc_proc = &server->client_acl->cl_procinfo[ACLPROC3_SETACL]; 321 status = rpc_call_sync(server->client_acl, &msg, 0); 322 spin_lock(&inode->i_lock); 323 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ACCESS; 324 spin_unlock(&inode->i_lock); 325 dprintk("NFS reply setacl: %d\n", status); 326 327 /* pages may have been allocated at the xdr layer. */ 328 for (count = 0; count < NFSACL_MAXPAGES && args.pages[count]; count++) 329 __free_page(args.pages[count]); 330 331 switch (status) { 332 case 0: 333 status = nfs_refresh_inode(inode, &fattr); 334 nfs3_cache_acls(inode, acl, dfacl); 335 break; 336 case -EPFNOSUPPORT: 337 case -EPROTONOSUPPORT: 338 dprintk("NFS_V3_ACL SETACL RPC not supported" 339 "(will not retry)\n"); 340 server->caps &= ~NFS_CAP_ACLS; 341 case -ENOTSUPP: 342 status = -EOPNOTSUPP; 343 } 344 out: 345 return status; 346 } 347 348 int nfs3_proc_setacl(struct inode *inode, int type, struct posix_acl *acl) 349 { 350 struct posix_acl *alloc = NULL, *dfacl = NULL; 351 int status; 352 353 if (S_ISDIR(inode->i_mode)) { 354 switch(type) { 355 case ACL_TYPE_ACCESS: 356 alloc = dfacl = nfs3_proc_getacl(inode, 357 ACL_TYPE_DEFAULT); 358 if (IS_ERR(alloc)) 359 goto fail; 360 break; 361 362 case ACL_TYPE_DEFAULT: 363 dfacl = acl; 364 alloc = acl = nfs3_proc_getacl(inode, 365 ACL_TYPE_ACCESS); 366 if (IS_ERR(alloc)) 367 goto fail; 368 break; 369 370 default: 371 return -EINVAL; 372 } 373 } else if (type != ACL_TYPE_ACCESS) 374 return -EINVAL; 375 376 if (acl == NULL) { 377 alloc = acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL); 378 if (IS_ERR(alloc)) 379 goto fail; 380 } 381 status = nfs3_proc_setacls(inode, acl, dfacl); 382 posix_acl_release(alloc); 383 return status; 384 385 fail: 386 return PTR_ERR(alloc); 387 } 388 389 int nfs3_proc_set_default_acl(struct inode *dir, struct inode *inode, 390 mode_t mode) 391 { 392 struct posix_acl *dfacl, *acl; 393 int error = 0; 394 395 dfacl = nfs3_proc_getacl(dir, ACL_TYPE_DEFAULT); 396 if (IS_ERR(dfacl)) { 397 error = PTR_ERR(dfacl); 398 return (error == -EOPNOTSUPP) ? 0 : error; 399 } 400 if (!dfacl) 401 return 0; 402 acl = posix_acl_clone(dfacl, GFP_KERNEL); 403 error = -ENOMEM; 404 if (!acl) 405 goto out_release_dfacl; 406 error = posix_acl_create_masq(acl, &mode); 407 if (error < 0) 408 goto out_release_acl; 409 error = nfs3_proc_setacls(inode, acl, S_ISDIR(inode->i_mode) ? 410 dfacl : NULL); 411 out_release_acl: 412 posix_acl_release(acl); 413 out_release_dfacl: 414 posix_acl_release(dfacl); 415 return error; 416 } 417