1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/ceph/ceph_debug.h> 3 #include <linux/ceph/pagelist.h> 4 5 #include "super.h" 6 #include "mds_client.h" 7 8 #include <linux/ceph/decode.h> 9 10 #include <linux/xattr.h> 11 #include <linux/security.h> 12 #include <linux/posix_acl_xattr.h> 13 #include <linux/slab.h> 14 15 #define XATTR_CEPH_PREFIX "ceph." 16 #define XATTR_CEPH_PREFIX_LEN (sizeof (XATTR_CEPH_PREFIX) - 1) 17 18 static int __remove_xattr(struct ceph_inode_info *ci, 19 struct ceph_inode_xattr *xattr); 20 21 static bool ceph_is_valid_xattr(const char *name) 22 { 23 return !strncmp(name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN) || 24 !strncmp(name, XATTR_CEPH_PREFIX, XATTR_CEPH_PREFIX_LEN) || 25 !strncmp(name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN) || 26 !strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN); 27 } 28 29 /* 30 * These define virtual xattrs exposing the recursive directory 31 * statistics and layout metadata. 32 */ 33 struct ceph_vxattr { 34 char *name; 35 size_t name_size; /* strlen(name) + 1 (for '\0') */ 36 ssize_t (*getxattr_cb)(struct ceph_inode_info *ci, char *val, 37 size_t size); 38 bool (*exists_cb)(struct ceph_inode_info *ci); 39 unsigned int flags; 40 }; 41 42 #define VXATTR_FLAG_READONLY (1<<0) 43 #define VXATTR_FLAG_HIDDEN (1<<1) 44 #define VXATTR_FLAG_RSTAT (1<<2) 45 #define VXATTR_FLAG_DIRSTAT (1<<3) 46 47 /* layouts */ 48 49 static bool ceph_vxattrcb_layout_exists(struct ceph_inode_info *ci) 50 { 51 struct ceph_file_layout *fl = &ci->i_layout; 52 return (fl->stripe_unit > 0 || fl->stripe_count > 0 || 53 fl->object_size > 0 || fl->pool_id >= 0 || 54 rcu_dereference_raw(fl->pool_ns) != NULL); 55 } 56 57 static ssize_t ceph_vxattrcb_layout(struct ceph_inode_info *ci, char *val, 58 size_t size) 59 { 60 struct ceph_fs_client *fsc = ceph_sb_to_client(ci->netfs.inode.i_sb); 61 struct ceph_osd_client *osdc = &fsc->client->osdc; 62 struct ceph_string *pool_ns; 63 s64 pool = ci->i_layout.pool_id; 64 const char *pool_name; 65 const char *ns_field = " pool_namespace="; 66 char buf[128]; 67 size_t len, total_len = 0; 68 ssize_t ret; 69 70 pool_ns = ceph_try_get_string(ci->i_layout.pool_ns); 71 72 dout("ceph_vxattrcb_layout %p\n", &ci->netfs.inode); 73 down_read(&osdc->lock); 74 pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, pool); 75 if (pool_name) { 76 len = snprintf(buf, sizeof(buf), 77 "stripe_unit=%u stripe_count=%u object_size=%u pool=", 78 ci->i_layout.stripe_unit, ci->i_layout.stripe_count, 79 ci->i_layout.object_size); 80 total_len = len + strlen(pool_name); 81 } else { 82 len = snprintf(buf, sizeof(buf), 83 "stripe_unit=%u stripe_count=%u object_size=%u pool=%lld", 84 ci->i_layout.stripe_unit, ci->i_layout.stripe_count, 85 ci->i_layout.object_size, pool); 86 total_len = len; 87 } 88 89 if (pool_ns) 90 total_len += strlen(ns_field) + pool_ns->len; 91 92 ret = total_len; 93 if (size >= total_len) { 94 memcpy(val, buf, len); 95 ret = len; 96 if (pool_name) { 97 len = strlen(pool_name); 98 memcpy(val + ret, pool_name, len); 99 ret += len; 100 } 101 if (pool_ns) { 102 len = strlen(ns_field); 103 memcpy(val + ret, ns_field, len); 104 ret += len; 105 memcpy(val + ret, pool_ns->str, pool_ns->len); 106 ret += pool_ns->len; 107 } 108 } 109 up_read(&osdc->lock); 110 ceph_put_string(pool_ns); 111 return ret; 112 } 113 114 /* 115 * The convention with strings in xattrs is that they should not be NULL 116 * terminated, since we're returning the length with them. snprintf always 117 * NULL terminates however, so call it on a temporary buffer and then memcpy 118 * the result into place. 119 */ 120 static __printf(3, 4) 121 int ceph_fmt_xattr(char *val, size_t size, const char *fmt, ...) 122 { 123 int ret; 124 va_list args; 125 char buf[96]; /* NB: reevaluate size if new vxattrs are added */ 126 127 va_start(args, fmt); 128 ret = vsnprintf(buf, size ? sizeof(buf) : 0, fmt, args); 129 va_end(args); 130 131 /* Sanity check */ 132 if (size && ret + 1 > sizeof(buf)) { 133 WARN_ONCE(true, "Returned length too big (%d)", ret); 134 return -E2BIG; 135 } 136 137 if (ret <= size) 138 memcpy(val, buf, ret); 139 return ret; 140 } 141 142 static ssize_t ceph_vxattrcb_layout_stripe_unit(struct ceph_inode_info *ci, 143 char *val, size_t size) 144 { 145 return ceph_fmt_xattr(val, size, "%u", ci->i_layout.stripe_unit); 146 } 147 148 static ssize_t ceph_vxattrcb_layout_stripe_count(struct ceph_inode_info *ci, 149 char *val, size_t size) 150 { 151 return ceph_fmt_xattr(val, size, "%u", ci->i_layout.stripe_count); 152 } 153 154 static ssize_t ceph_vxattrcb_layout_object_size(struct ceph_inode_info *ci, 155 char *val, size_t size) 156 { 157 return ceph_fmt_xattr(val, size, "%u", ci->i_layout.object_size); 158 } 159 160 static ssize_t ceph_vxattrcb_layout_pool(struct ceph_inode_info *ci, 161 char *val, size_t size) 162 { 163 ssize_t ret; 164 struct ceph_fs_client *fsc = ceph_sb_to_client(ci->netfs.inode.i_sb); 165 struct ceph_osd_client *osdc = &fsc->client->osdc; 166 s64 pool = ci->i_layout.pool_id; 167 const char *pool_name; 168 169 down_read(&osdc->lock); 170 pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, pool); 171 if (pool_name) { 172 ret = strlen(pool_name); 173 if (ret <= size) 174 memcpy(val, pool_name, ret); 175 } else { 176 ret = ceph_fmt_xattr(val, size, "%lld", pool); 177 } 178 up_read(&osdc->lock); 179 return ret; 180 } 181 182 static ssize_t ceph_vxattrcb_layout_pool_namespace(struct ceph_inode_info *ci, 183 char *val, size_t size) 184 { 185 ssize_t ret = 0; 186 struct ceph_string *ns = ceph_try_get_string(ci->i_layout.pool_ns); 187 188 if (ns) { 189 ret = ns->len; 190 if (ret <= size) 191 memcpy(val, ns->str, ret); 192 ceph_put_string(ns); 193 } 194 return ret; 195 } 196 197 /* directories */ 198 199 static ssize_t ceph_vxattrcb_dir_entries(struct ceph_inode_info *ci, char *val, 200 size_t size) 201 { 202 return ceph_fmt_xattr(val, size, "%lld", ci->i_files + ci->i_subdirs); 203 } 204 205 static ssize_t ceph_vxattrcb_dir_files(struct ceph_inode_info *ci, char *val, 206 size_t size) 207 { 208 return ceph_fmt_xattr(val, size, "%lld", ci->i_files); 209 } 210 211 static ssize_t ceph_vxattrcb_dir_subdirs(struct ceph_inode_info *ci, char *val, 212 size_t size) 213 { 214 return ceph_fmt_xattr(val, size, "%lld", ci->i_subdirs); 215 } 216 217 static ssize_t ceph_vxattrcb_dir_rentries(struct ceph_inode_info *ci, char *val, 218 size_t size) 219 { 220 return ceph_fmt_xattr(val, size, "%lld", 221 ci->i_rfiles + ci->i_rsubdirs); 222 } 223 224 static ssize_t ceph_vxattrcb_dir_rfiles(struct ceph_inode_info *ci, char *val, 225 size_t size) 226 { 227 return ceph_fmt_xattr(val, size, "%lld", ci->i_rfiles); 228 } 229 230 static ssize_t ceph_vxattrcb_dir_rsubdirs(struct ceph_inode_info *ci, char *val, 231 size_t size) 232 { 233 return ceph_fmt_xattr(val, size, "%lld", ci->i_rsubdirs); 234 } 235 236 static ssize_t ceph_vxattrcb_dir_rsnaps(struct ceph_inode_info *ci, char *val, 237 size_t size) 238 { 239 return ceph_fmt_xattr(val, size, "%lld", ci->i_rsnaps); 240 } 241 242 static ssize_t ceph_vxattrcb_dir_rbytes(struct ceph_inode_info *ci, char *val, 243 size_t size) 244 { 245 return ceph_fmt_xattr(val, size, "%lld", ci->i_rbytes); 246 } 247 248 static ssize_t ceph_vxattrcb_dir_rctime(struct ceph_inode_info *ci, char *val, 249 size_t size) 250 { 251 return ceph_fmt_xattr(val, size, "%lld.%09ld", ci->i_rctime.tv_sec, 252 ci->i_rctime.tv_nsec); 253 } 254 255 /* dir pin */ 256 static bool ceph_vxattrcb_dir_pin_exists(struct ceph_inode_info *ci) 257 { 258 return ci->i_dir_pin != -ENODATA; 259 } 260 261 static ssize_t ceph_vxattrcb_dir_pin(struct ceph_inode_info *ci, char *val, 262 size_t size) 263 { 264 return ceph_fmt_xattr(val, size, "%d", (int)ci->i_dir_pin); 265 } 266 267 /* quotas */ 268 static bool ceph_vxattrcb_quota_exists(struct ceph_inode_info *ci) 269 { 270 bool ret = false; 271 spin_lock(&ci->i_ceph_lock); 272 if ((ci->i_max_files || ci->i_max_bytes) && 273 ci->i_vino.snap == CEPH_NOSNAP && 274 ci->i_snap_realm && 275 ci->i_snap_realm->ino == ci->i_vino.ino) 276 ret = true; 277 spin_unlock(&ci->i_ceph_lock); 278 return ret; 279 } 280 281 static ssize_t ceph_vxattrcb_quota(struct ceph_inode_info *ci, char *val, 282 size_t size) 283 { 284 return ceph_fmt_xattr(val, size, "max_bytes=%llu max_files=%llu", 285 ci->i_max_bytes, ci->i_max_files); 286 } 287 288 static ssize_t ceph_vxattrcb_quota_max_bytes(struct ceph_inode_info *ci, 289 char *val, size_t size) 290 { 291 return ceph_fmt_xattr(val, size, "%llu", ci->i_max_bytes); 292 } 293 294 static ssize_t ceph_vxattrcb_quota_max_files(struct ceph_inode_info *ci, 295 char *val, size_t size) 296 { 297 return ceph_fmt_xattr(val, size, "%llu", ci->i_max_files); 298 } 299 300 /* snapshots */ 301 static bool ceph_vxattrcb_snap_btime_exists(struct ceph_inode_info *ci) 302 { 303 return (ci->i_snap_btime.tv_sec != 0 || ci->i_snap_btime.tv_nsec != 0); 304 } 305 306 static ssize_t ceph_vxattrcb_snap_btime(struct ceph_inode_info *ci, char *val, 307 size_t size) 308 { 309 return ceph_fmt_xattr(val, size, "%lld.%09ld", ci->i_snap_btime.tv_sec, 310 ci->i_snap_btime.tv_nsec); 311 } 312 313 static ssize_t ceph_vxattrcb_cluster_fsid(struct ceph_inode_info *ci, 314 char *val, size_t size) 315 { 316 struct ceph_fs_client *fsc = ceph_sb_to_client(ci->netfs.inode.i_sb); 317 318 return ceph_fmt_xattr(val, size, "%pU", &fsc->client->fsid); 319 } 320 321 static ssize_t ceph_vxattrcb_client_id(struct ceph_inode_info *ci, 322 char *val, size_t size) 323 { 324 struct ceph_fs_client *fsc = ceph_sb_to_client(ci->netfs.inode.i_sb); 325 326 return ceph_fmt_xattr(val, size, "client%lld", 327 ceph_client_gid(fsc->client)); 328 } 329 330 static ssize_t ceph_vxattrcb_caps(struct ceph_inode_info *ci, char *val, 331 size_t size) 332 { 333 int issued; 334 335 spin_lock(&ci->i_ceph_lock); 336 issued = __ceph_caps_issued(ci, NULL); 337 spin_unlock(&ci->i_ceph_lock); 338 339 return ceph_fmt_xattr(val, size, "%s/0x%x", 340 ceph_cap_string(issued), issued); 341 } 342 343 static ssize_t ceph_vxattrcb_auth_mds(struct ceph_inode_info *ci, 344 char *val, size_t size) 345 { 346 int ret; 347 348 spin_lock(&ci->i_ceph_lock); 349 ret = ceph_fmt_xattr(val, size, "%d", 350 ci->i_auth_cap ? ci->i_auth_cap->session->s_mds : -1); 351 spin_unlock(&ci->i_ceph_lock); 352 return ret; 353 } 354 355 #define CEPH_XATTR_NAME(_type, _name) XATTR_CEPH_PREFIX #_type "." #_name 356 #define CEPH_XATTR_NAME2(_type, _name, _name2) \ 357 XATTR_CEPH_PREFIX #_type "." #_name "." #_name2 358 359 #define XATTR_NAME_CEPH(_type, _name, _flags) \ 360 { \ 361 .name = CEPH_XATTR_NAME(_type, _name), \ 362 .name_size = sizeof (CEPH_XATTR_NAME(_type, _name)), \ 363 .getxattr_cb = ceph_vxattrcb_ ## _type ## _ ## _name, \ 364 .exists_cb = NULL, \ 365 .flags = (VXATTR_FLAG_READONLY | _flags), \ 366 } 367 #define XATTR_RSTAT_FIELD(_type, _name) \ 368 XATTR_NAME_CEPH(_type, _name, VXATTR_FLAG_RSTAT) 369 #define XATTR_RSTAT_FIELD_UPDATABLE(_type, _name) \ 370 { \ 371 .name = CEPH_XATTR_NAME(_type, _name), \ 372 .name_size = sizeof (CEPH_XATTR_NAME(_type, _name)), \ 373 .getxattr_cb = ceph_vxattrcb_ ## _type ## _ ## _name, \ 374 .exists_cb = NULL, \ 375 .flags = VXATTR_FLAG_RSTAT, \ 376 } 377 #define XATTR_LAYOUT_FIELD(_type, _name, _field) \ 378 { \ 379 .name = CEPH_XATTR_NAME2(_type, _name, _field), \ 380 .name_size = sizeof (CEPH_XATTR_NAME2(_type, _name, _field)), \ 381 .getxattr_cb = ceph_vxattrcb_ ## _name ## _ ## _field, \ 382 .exists_cb = ceph_vxattrcb_layout_exists, \ 383 .flags = VXATTR_FLAG_HIDDEN, \ 384 } 385 #define XATTR_QUOTA_FIELD(_type, _name) \ 386 { \ 387 .name = CEPH_XATTR_NAME(_type, _name), \ 388 .name_size = sizeof(CEPH_XATTR_NAME(_type, _name)), \ 389 .getxattr_cb = ceph_vxattrcb_ ## _type ## _ ## _name, \ 390 .exists_cb = ceph_vxattrcb_quota_exists, \ 391 .flags = VXATTR_FLAG_HIDDEN, \ 392 } 393 394 static struct ceph_vxattr ceph_dir_vxattrs[] = { 395 { 396 .name = "ceph.dir.layout", 397 .name_size = sizeof("ceph.dir.layout"), 398 .getxattr_cb = ceph_vxattrcb_layout, 399 .exists_cb = ceph_vxattrcb_layout_exists, 400 .flags = VXATTR_FLAG_HIDDEN, 401 }, 402 XATTR_LAYOUT_FIELD(dir, layout, stripe_unit), 403 XATTR_LAYOUT_FIELD(dir, layout, stripe_count), 404 XATTR_LAYOUT_FIELD(dir, layout, object_size), 405 XATTR_LAYOUT_FIELD(dir, layout, pool), 406 XATTR_LAYOUT_FIELD(dir, layout, pool_namespace), 407 XATTR_NAME_CEPH(dir, entries, VXATTR_FLAG_DIRSTAT), 408 XATTR_NAME_CEPH(dir, files, VXATTR_FLAG_DIRSTAT), 409 XATTR_NAME_CEPH(dir, subdirs, VXATTR_FLAG_DIRSTAT), 410 XATTR_RSTAT_FIELD(dir, rentries), 411 XATTR_RSTAT_FIELD(dir, rfiles), 412 XATTR_RSTAT_FIELD(dir, rsubdirs), 413 XATTR_RSTAT_FIELD(dir, rsnaps), 414 XATTR_RSTAT_FIELD(dir, rbytes), 415 XATTR_RSTAT_FIELD_UPDATABLE(dir, rctime), 416 { 417 .name = "ceph.dir.pin", 418 .name_size = sizeof("ceph.dir.pin"), 419 .getxattr_cb = ceph_vxattrcb_dir_pin, 420 .exists_cb = ceph_vxattrcb_dir_pin_exists, 421 .flags = VXATTR_FLAG_HIDDEN, 422 }, 423 { 424 .name = "ceph.quota", 425 .name_size = sizeof("ceph.quota"), 426 .getxattr_cb = ceph_vxattrcb_quota, 427 .exists_cb = ceph_vxattrcb_quota_exists, 428 .flags = VXATTR_FLAG_HIDDEN, 429 }, 430 XATTR_QUOTA_FIELD(quota, max_bytes), 431 XATTR_QUOTA_FIELD(quota, max_files), 432 { 433 .name = "ceph.snap.btime", 434 .name_size = sizeof("ceph.snap.btime"), 435 .getxattr_cb = ceph_vxattrcb_snap_btime, 436 .exists_cb = ceph_vxattrcb_snap_btime_exists, 437 .flags = VXATTR_FLAG_READONLY, 438 }, 439 { 440 .name = "ceph.caps", 441 .name_size = sizeof("ceph.caps"), 442 .getxattr_cb = ceph_vxattrcb_caps, 443 .exists_cb = NULL, 444 .flags = VXATTR_FLAG_HIDDEN, 445 }, 446 { .name = NULL, 0 } /* Required table terminator */ 447 }; 448 449 /* files */ 450 451 static struct ceph_vxattr ceph_file_vxattrs[] = { 452 { 453 .name = "ceph.file.layout", 454 .name_size = sizeof("ceph.file.layout"), 455 .getxattr_cb = ceph_vxattrcb_layout, 456 .exists_cb = ceph_vxattrcb_layout_exists, 457 .flags = VXATTR_FLAG_HIDDEN, 458 }, 459 XATTR_LAYOUT_FIELD(file, layout, stripe_unit), 460 XATTR_LAYOUT_FIELD(file, layout, stripe_count), 461 XATTR_LAYOUT_FIELD(file, layout, object_size), 462 XATTR_LAYOUT_FIELD(file, layout, pool), 463 XATTR_LAYOUT_FIELD(file, layout, pool_namespace), 464 { 465 .name = "ceph.snap.btime", 466 .name_size = sizeof("ceph.snap.btime"), 467 .getxattr_cb = ceph_vxattrcb_snap_btime, 468 .exists_cb = ceph_vxattrcb_snap_btime_exists, 469 .flags = VXATTR_FLAG_READONLY, 470 }, 471 { 472 .name = "ceph.caps", 473 .name_size = sizeof("ceph.caps"), 474 .getxattr_cb = ceph_vxattrcb_caps, 475 .exists_cb = NULL, 476 .flags = VXATTR_FLAG_HIDDEN, 477 }, 478 { .name = NULL, 0 } /* Required table terminator */ 479 }; 480 481 static struct ceph_vxattr ceph_common_vxattrs[] = { 482 { 483 .name = "ceph.cluster_fsid", 484 .name_size = sizeof("ceph.cluster_fsid"), 485 .getxattr_cb = ceph_vxattrcb_cluster_fsid, 486 .exists_cb = NULL, 487 .flags = VXATTR_FLAG_READONLY, 488 }, 489 { 490 .name = "ceph.client_id", 491 .name_size = sizeof("ceph.client_id"), 492 .getxattr_cb = ceph_vxattrcb_client_id, 493 .exists_cb = NULL, 494 .flags = VXATTR_FLAG_READONLY, 495 }, 496 { 497 .name = "ceph.auth_mds", 498 .name_size = sizeof("ceph.auth_mds"), 499 .getxattr_cb = ceph_vxattrcb_auth_mds, 500 .exists_cb = NULL, 501 .flags = VXATTR_FLAG_READONLY, 502 }, 503 { .name = NULL, 0 } /* Required table terminator */ 504 }; 505 506 static struct ceph_vxattr *ceph_inode_vxattrs(struct inode *inode) 507 { 508 if (S_ISDIR(inode->i_mode)) 509 return ceph_dir_vxattrs; 510 else if (S_ISREG(inode->i_mode)) 511 return ceph_file_vxattrs; 512 return NULL; 513 } 514 515 static struct ceph_vxattr *ceph_match_vxattr(struct inode *inode, 516 const char *name) 517 { 518 struct ceph_vxattr *vxattr = ceph_inode_vxattrs(inode); 519 520 if (vxattr) { 521 while (vxattr->name) { 522 if (!strcmp(vxattr->name, name)) 523 return vxattr; 524 vxattr++; 525 } 526 } 527 528 vxattr = ceph_common_vxattrs; 529 while (vxattr->name) { 530 if (!strcmp(vxattr->name, name)) 531 return vxattr; 532 vxattr++; 533 } 534 535 return NULL; 536 } 537 538 static int __set_xattr(struct ceph_inode_info *ci, 539 const char *name, int name_len, 540 const char *val, int val_len, 541 int flags, int update_xattr, 542 struct ceph_inode_xattr **newxattr) 543 { 544 struct rb_node **p; 545 struct rb_node *parent = NULL; 546 struct ceph_inode_xattr *xattr = NULL; 547 int c; 548 int new = 0; 549 550 p = &ci->i_xattrs.index.rb_node; 551 while (*p) { 552 parent = *p; 553 xattr = rb_entry(parent, struct ceph_inode_xattr, node); 554 c = strncmp(name, xattr->name, min(name_len, xattr->name_len)); 555 if (c < 0) 556 p = &(*p)->rb_left; 557 else if (c > 0) 558 p = &(*p)->rb_right; 559 else { 560 if (name_len == xattr->name_len) 561 break; 562 else if (name_len < xattr->name_len) 563 p = &(*p)->rb_left; 564 else 565 p = &(*p)->rb_right; 566 } 567 xattr = NULL; 568 } 569 570 if (update_xattr) { 571 int err = 0; 572 573 if (xattr && (flags & XATTR_CREATE)) 574 err = -EEXIST; 575 else if (!xattr && (flags & XATTR_REPLACE)) 576 err = -ENODATA; 577 if (err) { 578 kfree(name); 579 kfree(val); 580 kfree(*newxattr); 581 return err; 582 } 583 if (update_xattr < 0) { 584 if (xattr) 585 __remove_xattr(ci, xattr); 586 kfree(name); 587 kfree(*newxattr); 588 return 0; 589 } 590 } 591 592 if (!xattr) { 593 new = 1; 594 xattr = *newxattr; 595 xattr->name = name; 596 xattr->name_len = name_len; 597 xattr->should_free_name = update_xattr; 598 599 ci->i_xattrs.count++; 600 dout("__set_xattr count=%d\n", ci->i_xattrs.count); 601 } else { 602 kfree(*newxattr); 603 *newxattr = NULL; 604 if (xattr->should_free_val) 605 kfree(xattr->val); 606 607 if (update_xattr) { 608 kfree(name); 609 name = xattr->name; 610 } 611 ci->i_xattrs.names_size -= xattr->name_len; 612 ci->i_xattrs.vals_size -= xattr->val_len; 613 } 614 ci->i_xattrs.names_size += name_len; 615 ci->i_xattrs.vals_size += val_len; 616 if (val) 617 xattr->val = val; 618 else 619 xattr->val = ""; 620 621 xattr->val_len = val_len; 622 xattr->dirty = update_xattr; 623 xattr->should_free_val = (val && update_xattr); 624 625 if (new) { 626 rb_link_node(&xattr->node, parent, p); 627 rb_insert_color(&xattr->node, &ci->i_xattrs.index); 628 dout("__set_xattr_val p=%p\n", p); 629 } 630 631 dout("__set_xattr_val added %llx.%llx xattr %p %.*s=%.*s\n", 632 ceph_vinop(&ci->netfs.inode), xattr, name_len, name, val_len, val); 633 634 return 0; 635 } 636 637 static struct ceph_inode_xattr *__get_xattr(struct ceph_inode_info *ci, 638 const char *name) 639 { 640 struct rb_node **p; 641 struct rb_node *parent = NULL; 642 struct ceph_inode_xattr *xattr = NULL; 643 int name_len = strlen(name); 644 int c; 645 646 p = &ci->i_xattrs.index.rb_node; 647 while (*p) { 648 parent = *p; 649 xattr = rb_entry(parent, struct ceph_inode_xattr, node); 650 c = strncmp(name, xattr->name, xattr->name_len); 651 if (c == 0 && name_len > xattr->name_len) 652 c = 1; 653 if (c < 0) 654 p = &(*p)->rb_left; 655 else if (c > 0) 656 p = &(*p)->rb_right; 657 else { 658 dout("__get_xattr %s: found %.*s\n", name, 659 xattr->val_len, xattr->val); 660 return xattr; 661 } 662 } 663 664 dout("__get_xattr %s: not found\n", name); 665 666 return NULL; 667 } 668 669 static void __free_xattr(struct ceph_inode_xattr *xattr) 670 { 671 BUG_ON(!xattr); 672 673 if (xattr->should_free_name) 674 kfree(xattr->name); 675 if (xattr->should_free_val) 676 kfree(xattr->val); 677 678 kfree(xattr); 679 } 680 681 static int __remove_xattr(struct ceph_inode_info *ci, 682 struct ceph_inode_xattr *xattr) 683 { 684 if (!xattr) 685 return -ENODATA; 686 687 rb_erase(&xattr->node, &ci->i_xattrs.index); 688 689 if (xattr->should_free_name) 690 kfree(xattr->name); 691 if (xattr->should_free_val) 692 kfree(xattr->val); 693 694 ci->i_xattrs.names_size -= xattr->name_len; 695 ci->i_xattrs.vals_size -= xattr->val_len; 696 ci->i_xattrs.count--; 697 kfree(xattr); 698 699 return 0; 700 } 701 702 static char *__copy_xattr_names(struct ceph_inode_info *ci, 703 char *dest) 704 { 705 struct rb_node *p; 706 struct ceph_inode_xattr *xattr = NULL; 707 708 p = rb_first(&ci->i_xattrs.index); 709 dout("__copy_xattr_names count=%d\n", ci->i_xattrs.count); 710 711 while (p) { 712 xattr = rb_entry(p, struct ceph_inode_xattr, node); 713 memcpy(dest, xattr->name, xattr->name_len); 714 dest[xattr->name_len] = '\0'; 715 716 dout("dest=%s %p (%s) (%d/%d)\n", dest, xattr, xattr->name, 717 xattr->name_len, ci->i_xattrs.names_size); 718 719 dest += xattr->name_len + 1; 720 p = rb_next(p); 721 } 722 723 return dest; 724 } 725 726 void __ceph_destroy_xattrs(struct ceph_inode_info *ci) 727 { 728 struct rb_node *p, *tmp; 729 struct ceph_inode_xattr *xattr = NULL; 730 731 p = rb_first(&ci->i_xattrs.index); 732 733 dout("__ceph_destroy_xattrs p=%p\n", p); 734 735 while (p) { 736 xattr = rb_entry(p, struct ceph_inode_xattr, node); 737 tmp = p; 738 p = rb_next(tmp); 739 dout("__ceph_destroy_xattrs next p=%p (%.*s)\n", p, 740 xattr->name_len, xattr->name); 741 rb_erase(tmp, &ci->i_xattrs.index); 742 743 __free_xattr(xattr); 744 } 745 746 ci->i_xattrs.names_size = 0; 747 ci->i_xattrs.vals_size = 0; 748 ci->i_xattrs.index_version = 0; 749 ci->i_xattrs.count = 0; 750 ci->i_xattrs.index = RB_ROOT; 751 } 752 753 static int __build_xattrs(struct inode *inode) 754 __releases(ci->i_ceph_lock) 755 __acquires(ci->i_ceph_lock) 756 { 757 u32 namelen; 758 u32 numattr = 0; 759 void *p, *end; 760 u32 len; 761 const char *name, *val; 762 struct ceph_inode_info *ci = ceph_inode(inode); 763 u64 xattr_version; 764 struct ceph_inode_xattr **xattrs = NULL; 765 int err = 0; 766 int i; 767 768 dout("__build_xattrs() len=%d\n", 769 ci->i_xattrs.blob ? (int)ci->i_xattrs.blob->vec.iov_len : 0); 770 771 if (ci->i_xattrs.index_version >= ci->i_xattrs.version) 772 return 0; /* already built */ 773 774 __ceph_destroy_xattrs(ci); 775 776 start: 777 /* updated internal xattr rb tree */ 778 if (ci->i_xattrs.blob && ci->i_xattrs.blob->vec.iov_len > 4) { 779 p = ci->i_xattrs.blob->vec.iov_base; 780 end = p + ci->i_xattrs.blob->vec.iov_len; 781 ceph_decode_32_safe(&p, end, numattr, bad); 782 xattr_version = ci->i_xattrs.version; 783 spin_unlock(&ci->i_ceph_lock); 784 785 xattrs = kcalloc(numattr, sizeof(struct ceph_inode_xattr *), 786 GFP_NOFS); 787 err = -ENOMEM; 788 if (!xattrs) 789 goto bad_lock; 790 791 for (i = 0; i < numattr; i++) { 792 xattrs[i] = kmalloc(sizeof(struct ceph_inode_xattr), 793 GFP_NOFS); 794 if (!xattrs[i]) 795 goto bad_lock; 796 } 797 798 spin_lock(&ci->i_ceph_lock); 799 if (ci->i_xattrs.version != xattr_version) { 800 /* lost a race, retry */ 801 for (i = 0; i < numattr; i++) 802 kfree(xattrs[i]); 803 kfree(xattrs); 804 xattrs = NULL; 805 goto start; 806 } 807 err = -EIO; 808 while (numattr--) { 809 ceph_decode_32_safe(&p, end, len, bad); 810 namelen = len; 811 name = p; 812 p += len; 813 ceph_decode_32_safe(&p, end, len, bad); 814 val = p; 815 p += len; 816 817 err = __set_xattr(ci, name, namelen, val, len, 818 0, 0, &xattrs[numattr]); 819 820 if (err < 0) 821 goto bad; 822 } 823 kfree(xattrs); 824 } 825 ci->i_xattrs.index_version = ci->i_xattrs.version; 826 ci->i_xattrs.dirty = false; 827 828 return err; 829 bad_lock: 830 spin_lock(&ci->i_ceph_lock); 831 bad: 832 if (xattrs) { 833 for (i = 0; i < numattr; i++) 834 kfree(xattrs[i]); 835 kfree(xattrs); 836 } 837 ci->i_xattrs.names_size = 0; 838 return err; 839 } 840 841 static int __get_required_blob_size(struct ceph_inode_info *ci, int name_size, 842 int val_size) 843 { 844 /* 845 * 4 bytes for the length, and additional 4 bytes per each xattr name, 846 * 4 bytes per each value 847 */ 848 int size = 4 + ci->i_xattrs.count*(4 + 4) + 849 ci->i_xattrs.names_size + 850 ci->i_xattrs.vals_size; 851 dout("__get_required_blob_size c=%d names.size=%d vals.size=%d\n", 852 ci->i_xattrs.count, ci->i_xattrs.names_size, 853 ci->i_xattrs.vals_size); 854 855 if (name_size) 856 size += 4 + 4 + name_size + val_size; 857 858 return size; 859 } 860 861 /* 862 * If there are dirty xattrs, reencode xattrs into the prealloc_blob 863 * and swap into place. It returns the old i_xattrs.blob (or NULL) so 864 * that it can be freed by the caller as the i_ceph_lock is likely to be 865 * held. 866 */ 867 struct ceph_buffer *__ceph_build_xattrs_blob(struct ceph_inode_info *ci) 868 { 869 struct rb_node *p; 870 struct ceph_inode_xattr *xattr = NULL; 871 struct ceph_buffer *old_blob = NULL; 872 void *dest; 873 874 dout("__build_xattrs_blob %p\n", &ci->netfs.inode); 875 if (ci->i_xattrs.dirty) { 876 int need = __get_required_blob_size(ci, 0, 0); 877 878 BUG_ON(need > ci->i_xattrs.prealloc_blob->alloc_len); 879 880 p = rb_first(&ci->i_xattrs.index); 881 dest = ci->i_xattrs.prealloc_blob->vec.iov_base; 882 883 ceph_encode_32(&dest, ci->i_xattrs.count); 884 while (p) { 885 xattr = rb_entry(p, struct ceph_inode_xattr, node); 886 887 ceph_encode_32(&dest, xattr->name_len); 888 memcpy(dest, xattr->name, xattr->name_len); 889 dest += xattr->name_len; 890 ceph_encode_32(&dest, xattr->val_len); 891 memcpy(dest, xattr->val, xattr->val_len); 892 dest += xattr->val_len; 893 894 p = rb_next(p); 895 } 896 897 /* adjust buffer len; it may be larger than we need */ 898 ci->i_xattrs.prealloc_blob->vec.iov_len = 899 dest - ci->i_xattrs.prealloc_blob->vec.iov_base; 900 901 if (ci->i_xattrs.blob) 902 old_blob = ci->i_xattrs.blob; 903 ci->i_xattrs.blob = ci->i_xattrs.prealloc_blob; 904 ci->i_xattrs.prealloc_blob = NULL; 905 ci->i_xattrs.dirty = false; 906 ci->i_xattrs.version++; 907 } 908 909 return old_blob; 910 } 911 912 static inline int __get_request_mask(struct inode *in) { 913 struct ceph_mds_request *req = current->journal_info; 914 int mask = 0; 915 if (req && req->r_target_inode == in) { 916 if (req->r_op == CEPH_MDS_OP_LOOKUP || 917 req->r_op == CEPH_MDS_OP_LOOKUPINO || 918 req->r_op == CEPH_MDS_OP_LOOKUPPARENT || 919 req->r_op == CEPH_MDS_OP_GETATTR) { 920 mask = le32_to_cpu(req->r_args.getattr.mask); 921 } else if (req->r_op == CEPH_MDS_OP_OPEN || 922 req->r_op == CEPH_MDS_OP_CREATE) { 923 mask = le32_to_cpu(req->r_args.open.mask); 924 } 925 } 926 return mask; 927 } 928 929 ssize_t __ceph_getxattr(struct inode *inode, const char *name, void *value, 930 size_t size) 931 { 932 struct ceph_inode_info *ci = ceph_inode(inode); 933 struct ceph_inode_xattr *xattr; 934 struct ceph_vxattr *vxattr; 935 int req_mask; 936 ssize_t err; 937 938 if (strncmp(name, XATTR_CEPH_PREFIX, XATTR_CEPH_PREFIX_LEN)) 939 goto handle_non_vxattrs; 940 941 /* let's see if a virtual xattr was requested */ 942 vxattr = ceph_match_vxattr(inode, name); 943 if (vxattr) { 944 int mask = 0; 945 if (vxattr->flags & VXATTR_FLAG_RSTAT) 946 mask |= CEPH_STAT_RSTAT; 947 if (vxattr->flags & VXATTR_FLAG_DIRSTAT) 948 mask |= CEPH_CAP_FILE_SHARED; 949 err = ceph_do_getattr(inode, mask, true); 950 if (err) 951 return err; 952 err = -ENODATA; 953 if (!(vxattr->exists_cb && !vxattr->exists_cb(ci))) { 954 err = vxattr->getxattr_cb(ci, value, size); 955 if (size && size < err) 956 err = -ERANGE; 957 } 958 return err; 959 } else { 960 err = ceph_do_getvxattr(inode, name, value, size); 961 /* this would happen with a new client and old server combo */ 962 if (err == -EOPNOTSUPP) 963 err = -ENODATA; 964 return err; 965 } 966 handle_non_vxattrs: 967 req_mask = __get_request_mask(inode); 968 969 spin_lock(&ci->i_ceph_lock); 970 dout("getxattr %p name '%s' ver=%lld index_ver=%lld\n", inode, name, 971 ci->i_xattrs.version, ci->i_xattrs.index_version); 972 973 if (ci->i_xattrs.version == 0 || 974 !((req_mask & CEPH_CAP_XATTR_SHARED) || 975 __ceph_caps_issued_mask_metric(ci, CEPH_CAP_XATTR_SHARED, 1))) { 976 spin_unlock(&ci->i_ceph_lock); 977 978 /* security module gets xattr while filling trace */ 979 if (current->journal_info) { 980 pr_warn_ratelimited("sync getxattr %p " 981 "during filling trace\n", inode); 982 return -EBUSY; 983 } 984 985 /* get xattrs from mds (if we don't already have them) */ 986 err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR, true); 987 if (err) 988 return err; 989 spin_lock(&ci->i_ceph_lock); 990 } 991 992 err = __build_xattrs(inode); 993 if (err < 0) 994 goto out; 995 996 err = -ENODATA; /* == ENOATTR */ 997 xattr = __get_xattr(ci, name); 998 if (!xattr) 999 goto out; 1000 1001 err = -ERANGE; 1002 if (size && size < xattr->val_len) 1003 goto out; 1004 1005 err = xattr->val_len; 1006 if (size == 0) 1007 goto out; 1008 1009 memcpy(value, xattr->val, xattr->val_len); 1010 1011 if (current->journal_info && 1012 !strncmp(name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN) && 1013 security_ismaclabel(name + XATTR_SECURITY_PREFIX_LEN)) 1014 ci->i_ceph_flags |= CEPH_I_SEC_INITED; 1015 out: 1016 spin_unlock(&ci->i_ceph_lock); 1017 return err; 1018 } 1019 1020 ssize_t ceph_listxattr(struct dentry *dentry, char *names, size_t size) 1021 { 1022 struct inode *inode = d_inode(dentry); 1023 struct ceph_inode_info *ci = ceph_inode(inode); 1024 bool len_only = (size == 0); 1025 u32 namelen; 1026 int err; 1027 1028 spin_lock(&ci->i_ceph_lock); 1029 dout("listxattr %p ver=%lld index_ver=%lld\n", inode, 1030 ci->i_xattrs.version, ci->i_xattrs.index_version); 1031 1032 if (ci->i_xattrs.version == 0 || 1033 !__ceph_caps_issued_mask_metric(ci, CEPH_CAP_XATTR_SHARED, 1)) { 1034 spin_unlock(&ci->i_ceph_lock); 1035 err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR, true); 1036 if (err) 1037 return err; 1038 spin_lock(&ci->i_ceph_lock); 1039 } 1040 1041 err = __build_xattrs(inode); 1042 if (err < 0) 1043 goto out; 1044 1045 /* add 1 byte for each xattr due to the null termination */ 1046 namelen = ci->i_xattrs.names_size + ci->i_xattrs.count; 1047 if (!len_only) { 1048 if (namelen > size) { 1049 err = -ERANGE; 1050 goto out; 1051 } 1052 names = __copy_xattr_names(ci, names); 1053 size -= namelen; 1054 } 1055 err = namelen; 1056 out: 1057 spin_unlock(&ci->i_ceph_lock); 1058 return err; 1059 } 1060 1061 static int ceph_sync_setxattr(struct inode *inode, const char *name, 1062 const char *value, size_t size, int flags) 1063 { 1064 struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb); 1065 struct ceph_inode_info *ci = ceph_inode(inode); 1066 struct ceph_mds_request *req; 1067 struct ceph_mds_client *mdsc = fsc->mdsc; 1068 struct ceph_osd_client *osdc = &fsc->client->osdc; 1069 struct ceph_pagelist *pagelist = NULL; 1070 int op = CEPH_MDS_OP_SETXATTR; 1071 int err; 1072 1073 if (size > 0) { 1074 /* copy value into pagelist */ 1075 pagelist = ceph_pagelist_alloc(GFP_NOFS); 1076 if (!pagelist) 1077 return -ENOMEM; 1078 1079 err = ceph_pagelist_append(pagelist, value, size); 1080 if (err) 1081 goto out; 1082 } else if (!value) { 1083 if (flags & CEPH_XATTR_REPLACE) 1084 op = CEPH_MDS_OP_RMXATTR; 1085 else 1086 flags |= CEPH_XATTR_REMOVE; 1087 } 1088 1089 dout("setxattr value size: %zu\n", size); 1090 1091 /* do request */ 1092 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); 1093 if (IS_ERR(req)) { 1094 err = PTR_ERR(req); 1095 goto out; 1096 } 1097 1098 req->r_path2 = kstrdup(name, GFP_NOFS); 1099 if (!req->r_path2) { 1100 ceph_mdsc_put_request(req); 1101 err = -ENOMEM; 1102 goto out; 1103 } 1104 1105 if (op == CEPH_MDS_OP_SETXATTR) { 1106 req->r_args.setxattr.flags = cpu_to_le32(flags); 1107 req->r_args.setxattr.osdmap_epoch = 1108 cpu_to_le32(osdc->osdmap->epoch); 1109 req->r_pagelist = pagelist; 1110 pagelist = NULL; 1111 } 1112 1113 req->r_inode = inode; 1114 ihold(inode); 1115 req->r_num_caps = 1; 1116 req->r_inode_drop = CEPH_CAP_XATTR_SHARED; 1117 1118 dout("xattr.ver (before): %lld\n", ci->i_xattrs.version); 1119 err = ceph_mdsc_do_request(mdsc, NULL, req); 1120 ceph_mdsc_put_request(req); 1121 dout("xattr.ver (after): %lld\n", ci->i_xattrs.version); 1122 1123 out: 1124 if (pagelist) 1125 ceph_pagelist_release(pagelist); 1126 return err; 1127 } 1128 1129 int __ceph_setxattr(struct inode *inode, const char *name, 1130 const void *value, size_t size, int flags) 1131 { 1132 struct ceph_vxattr *vxattr; 1133 struct ceph_inode_info *ci = ceph_inode(inode); 1134 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc; 1135 struct ceph_cap_flush *prealloc_cf = NULL; 1136 struct ceph_buffer *old_blob = NULL; 1137 int issued; 1138 int err; 1139 int dirty = 0; 1140 int name_len = strlen(name); 1141 int val_len = size; 1142 char *newname = NULL; 1143 char *newval = NULL; 1144 struct ceph_inode_xattr *xattr = NULL; 1145 int required_blob_size; 1146 bool check_realm = false; 1147 bool lock_snap_rwsem = false; 1148 1149 if (ceph_snap(inode) != CEPH_NOSNAP) 1150 return -EROFS; 1151 1152 vxattr = ceph_match_vxattr(inode, name); 1153 if (vxattr) { 1154 if (vxattr->flags & VXATTR_FLAG_READONLY) 1155 return -EOPNOTSUPP; 1156 if (value && !strncmp(vxattr->name, "ceph.quota", 10)) 1157 check_realm = true; 1158 } 1159 1160 /* pass any unhandled ceph.* xattrs through to the MDS */ 1161 if (!strncmp(name, XATTR_CEPH_PREFIX, XATTR_CEPH_PREFIX_LEN)) 1162 goto do_sync_unlocked; 1163 1164 /* preallocate memory for xattr name, value, index node */ 1165 err = -ENOMEM; 1166 newname = kmemdup(name, name_len + 1, GFP_NOFS); 1167 if (!newname) 1168 goto out; 1169 1170 if (val_len) { 1171 newval = kmemdup(value, val_len, GFP_NOFS); 1172 if (!newval) 1173 goto out; 1174 } 1175 1176 xattr = kmalloc(sizeof(struct ceph_inode_xattr), GFP_NOFS); 1177 if (!xattr) 1178 goto out; 1179 1180 prealloc_cf = ceph_alloc_cap_flush(); 1181 if (!prealloc_cf) 1182 goto out; 1183 1184 spin_lock(&ci->i_ceph_lock); 1185 retry: 1186 issued = __ceph_caps_issued(ci, NULL); 1187 required_blob_size = __get_required_blob_size(ci, name_len, val_len); 1188 if ((ci->i_xattrs.version == 0) || !(issued & CEPH_CAP_XATTR_EXCL) || 1189 (required_blob_size > mdsc->mdsmap->m_max_xattr_size)) { 1190 dout("%s do sync setxattr: version: %llu size: %d max: %llu\n", 1191 __func__, ci->i_xattrs.version, required_blob_size, 1192 mdsc->mdsmap->m_max_xattr_size); 1193 goto do_sync; 1194 } 1195 1196 if (!lock_snap_rwsem && !ci->i_head_snapc) { 1197 lock_snap_rwsem = true; 1198 if (!down_read_trylock(&mdsc->snap_rwsem)) { 1199 spin_unlock(&ci->i_ceph_lock); 1200 down_read(&mdsc->snap_rwsem); 1201 spin_lock(&ci->i_ceph_lock); 1202 goto retry; 1203 } 1204 } 1205 1206 dout("setxattr %p name '%s' issued %s\n", inode, name, 1207 ceph_cap_string(issued)); 1208 __build_xattrs(inode); 1209 1210 if (!ci->i_xattrs.prealloc_blob || 1211 required_blob_size > ci->i_xattrs.prealloc_blob->alloc_len) { 1212 struct ceph_buffer *blob; 1213 1214 spin_unlock(&ci->i_ceph_lock); 1215 ceph_buffer_put(old_blob); /* Shouldn't be required */ 1216 dout(" pre-allocating new blob size=%d\n", required_blob_size); 1217 blob = ceph_buffer_new(required_blob_size, GFP_NOFS); 1218 if (!blob) 1219 goto do_sync_unlocked; 1220 spin_lock(&ci->i_ceph_lock); 1221 /* prealloc_blob can't be released while holding i_ceph_lock */ 1222 if (ci->i_xattrs.prealloc_blob) 1223 old_blob = ci->i_xattrs.prealloc_blob; 1224 ci->i_xattrs.prealloc_blob = blob; 1225 goto retry; 1226 } 1227 1228 err = __set_xattr(ci, newname, name_len, newval, val_len, 1229 flags, value ? 1 : -1, &xattr); 1230 1231 if (!err) { 1232 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_XATTR_EXCL, 1233 &prealloc_cf); 1234 ci->i_xattrs.dirty = true; 1235 inode->i_ctime = current_time(inode); 1236 } 1237 1238 spin_unlock(&ci->i_ceph_lock); 1239 ceph_buffer_put(old_blob); 1240 if (lock_snap_rwsem) 1241 up_read(&mdsc->snap_rwsem); 1242 if (dirty) 1243 __mark_inode_dirty(inode, dirty); 1244 ceph_free_cap_flush(prealloc_cf); 1245 return err; 1246 1247 do_sync: 1248 spin_unlock(&ci->i_ceph_lock); 1249 do_sync_unlocked: 1250 if (lock_snap_rwsem) 1251 up_read(&mdsc->snap_rwsem); 1252 1253 /* security module set xattr while filling trace */ 1254 if (current->journal_info) { 1255 pr_warn_ratelimited("sync setxattr %p " 1256 "during filling trace\n", inode); 1257 err = -EBUSY; 1258 } else { 1259 err = ceph_sync_setxattr(inode, name, value, size, flags); 1260 if (err >= 0 && check_realm) { 1261 /* check if snaprealm was created for quota inode */ 1262 spin_lock(&ci->i_ceph_lock); 1263 if ((ci->i_max_files || ci->i_max_bytes) && 1264 !(ci->i_snap_realm && 1265 ci->i_snap_realm->ino == ci->i_vino.ino)) 1266 err = -EOPNOTSUPP; 1267 spin_unlock(&ci->i_ceph_lock); 1268 } 1269 } 1270 out: 1271 ceph_free_cap_flush(prealloc_cf); 1272 kfree(newname); 1273 kfree(newval); 1274 kfree(xattr); 1275 return err; 1276 } 1277 1278 static int ceph_get_xattr_handler(const struct xattr_handler *handler, 1279 struct dentry *dentry, struct inode *inode, 1280 const char *name, void *value, size_t size) 1281 { 1282 if (!ceph_is_valid_xattr(name)) 1283 return -EOPNOTSUPP; 1284 return __ceph_getxattr(inode, name, value, size); 1285 } 1286 1287 static int ceph_set_xattr_handler(const struct xattr_handler *handler, 1288 struct user_namespace *mnt_userns, 1289 struct dentry *unused, struct inode *inode, 1290 const char *name, const void *value, 1291 size_t size, int flags) 1292 { 1293 if (!ceph_is_valid_xattr(name)) 1294 return -EOPNOTSUPP; 1295 return __ceph_setxattr(inode, name, value, size, flags); 1296 } 1297 1298 static const struct xattr_handler ceph_other_xattr_handler = { 1299 .prefix = "", /* match any name => handlers called with full name */ 1300 .get = ceph_get_xattr_handler, 1301 .set = ceph_set_xattr_handler, 1302 }; 1303 1304 #ifdef CONFIG_SECURITY 1305 bool ceph_security_xattr_wanted(struct inode *in) 1306 { 1307 return in->i_security != NULL; 1308 } 1309 1310 bool ceph_security_xattr_deadlock(struct inode *in) 1311 { 1312 struct ceph_inode_info *ci; 1313 bool ret; 1314 if (!in->i_security) 1315 return false; 1316 ci = ceph_inode(in); 1317 spin_lock(&ci->i_ceph_lock); 1318 ret = !(ci->i_ceph_flags & CEPH_I_SEC_INITED) && 1319 !(ci->i_xattrs.version > 0 && 1320 __ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 0)); 1321 spin_unlock(&ci->i_ceph_lock); 1322 return ret; 1323 } 1324 1325 #ifdef CONFIG_CEPH_FS_SECURITY_LABEL 1326 int ceph_security_init_secctx(struct dentry *dentry, umode_t mode, 1327 struct ceph_acl_sec_ctx *as_ctx) 1328 { 1329 struct ceph_pagelist *pagelist = as_ctx->pagelist; 1330 const char *name; 1331 size_t name_len; 1332 int err; 1333 1334 err = security_dentry_init_security(dentry, mode, &dentry->d_name, 1335 &name, &as_ctx->sec_ctx, 1336 &as_ctx->sec_ctxlen); 1337 if (err < 0) { 1338 WARN_ON_ONCE(err != -EOPNOTSUPP); 1339 err = 0; /* do nothing */ 1340 goto out; 1341 } 1342 1343 err = -ENOMEM; 1344 if (!pagelist) { 1345 pagelist = ceph_pagelist_alloc(GFP_KERNEL); 1346 if (!pagelist) 1347 goto out; 1348 err = ceph_pagelist_reserve(pagelist, PAGE_SIZE); 1349 if (err) 1350 goto out; 1351 ceph_pagelist_encode_32(pagelist, 1); 1352 } 1353 1354 /* 1355 * FIXME: Make security_dentry_init_security() generic. Currently 1356 * It only supports single security module and only selinux has 1357 * dentry_init_security hook. 1358 */ 1359 name_len = strlen(name); 1360 err = ceph_pagelist_reserve(pagelist, 1361 4 * 2 + name_len + as_ctx->sec_ctxlen); 1362 if (err) 1363 goto out; 1364 1365 if (as_ctx->pagelist) { 1366 /* update count of KV pairs */ 1367 BUG_ON(pagelist->length <= sizeof(__le32)); 1368 if (list_is_singular(&pagelist->head)) { 1369 le32_add_cpu((__le32*)pagelist->mapped_tail, 1); 1370 } else { 1371 struct page *page = list_first_entry(&pagelist->head, 1372 struct page, lru); 1373 void *addr = kmap_atomic(page); 1374 le32_add_cpu((__le32*)addr, 1); 1375 kunmap_atomic(addr); 1376 } 1377 } else { 1378 as_ctx->pagelist = pagelist; 1379 } 1380 1381 ceph_pagelist_encode_32(pagelist, name_len); 1382 ceph_pagelist_append(pagelist, name, name_len); 1383 1384 ceph_pagelist_encode_32(pagelist, as_ctx->sec_ctxlen); 1385 ceph_pagelist_append(pagelist, as_ctx->sec_ctx, as_ctx->sec_ctxlen); 1386 1387 err = 0; 1388 out: 1389 if (pagelist && !as_ctx->pagelist) 1390 ceph_pagelist_release(pagelist); 1391 return err; 1392 } 1393 #endif /* CONFIG_CEPH_FS_SECURITY_LABEL */ 1394 #endif /* CONFIG_SECURITY */ 1395 1396 void ceph_release_acl_sec_ctx(struct ceph_acl_sec_ctx *as_ctx) 1397 { 1398 #ifdef CONFIG_CEPH_FS_POSIX_ACL 1399 posix_acl_release(as_ctx->acl); 1400 posix_acl_release(as_ctx->default_acl); 1401 #endif 1402 #ifdef CONFIG_CEPH_FS_SECURITY_LABEL 1403 security_release_secctx(as_ctx->sec_ctx, as_ctx->sec_ctxlen); 1404 #endif 1405 if (as_ctx->pagelist) 1406 ceph_pagelist_release(as_ctx->pagelist); 1407 } 1408 1409 /* 1410 * List of handlers for synthetic system.* attributes. Other 1411 * attributes are handled directly. 1412 */ 1413 const struct xattr_handler *ceph_xattr_handlers[] = { 1414 #ifdef CONFIG_CEPH_FS_POSIX_ACL 1415 &posix_acl_access_xattr_handler, 1416 &posix_acl_default_xattr_handler, 1417 #endif 1418 &ceph_other_xattr_handler, 1419 NULL, 1420 }; 1421