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