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 18static int __remove_xattr(struct ceph_inode_info *ci, 19 struct ceph_inode_xattr *xattr); 20 21static 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 */ 33struct 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 49static 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 57static 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 */ 120static __printf(3, 4) 121int 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 142static 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 148static 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 154static 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 160static 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 182static 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 199static 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 205static 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 211static 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 217static 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 224static 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 230static 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 236static 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 242static 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 248static 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 */ 256static bool ceph_vxattrcb_dir_pin_exists(struct ceph_inode_info *ci) 257{ 258 return ci->i_dir_pin != -ENODATA; 259} 260 261static 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 */ 268static 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 281static 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 288static 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 294static 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 */ 301static 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 306static 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 313static 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 321static 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 330static 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 343static 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#if IS_ENABLED(CONFIG_FS_ENCRYPTION) 356static bool ceph_vxattrcb_fscrypt_auth_exists(struct ceph_inode_info *ci) 357{ 358 return ci->fscrypt_auth_len; 359} 360 361static ssize_t ceph_vxattrcb_fscrypt_auth(struct ceph_inode_info *ci, 362 char *val, size_t size) 363{ 364 if (size) { 365 if (size < ci->fscrypt_auth_len) 366 return -ERANGE; 367 memcpy(val, ci->fscrypt_auth, ci->fscrypt_auth_len); 368 } 369 return ci->fscrypt_auth_len; 370} 371#endif /* CONFIG_FS_ENCRYPTION */ 372 373#define CEPH_XATTR_NAME(_type, _name) XATTR_CEPH_PREFIX #_type "." #_name 374#define CEPH_XATTR_NAME2(_type, _name, _name2) \ 375 XATTR_CEPH_PREFIX #_type "." #_name "." #_name2 376 377#define XATTR_NAME_CEPH(_type, _name, _flags) \ 378 { \ 379 .name = CEPH_XATTR_NAME(_type, _name), \ 380 .name_size = sizeof (CEPH_XATTR_NAME(_type, _name)), \ 381 .getxattr_cb = ceph_vxattrcb_ ## _type ## _ ## _name, \ 382 .exists_cb = NULL, \ 383 .flags = (VXATTR_FLAG_READONLY | _flags), \ 384 } 385#define XATTR_RSTAT_FIELD(_type, _name) \ 386 XATTR_NAME_CEPH(_type, _name, VXATTR_FLAG_RSTAT) 387#define XATTR_RSTAT_FIELD_UPDATABLE(_type, _name) \ 388 { \ 389 .name = CEPH_XATTR_NAME(_type, _name), \ 390 .name_size = sizeof (CEPH_XATTR_NAME(_type, _name)), \ 391 .getxattr_cb = ceph_vxattrcb_ ## _type ## _ ## _name, \ 392 .exists_cb = NULL, \ 393 .flags = VXATTR_FLAG_RSTAT, \ 394 } 395#define XATTR_LAYOUT_FIELD(_type, _name, _field) \ 396 { \ 397 .name = CEPH_XATTR_NAME2(_type, _name, _field), \ 398 .name_size = sizeof (CEPH_XATTR_NAME2(_type, _name, _field)), \ 399 .getxattr_cb = ceph_vxattrcb_ ## _name ## _ ## _field, \ 400 .exists_cb = ceph_vxattrcb_layout_exists, \ 401 .flags = VXATTR_FLAG_HIDDEN, \ 402 } 403#define XATTR_QUOTA_FIELD(_type, _name) \ 404 { \ 405 .name = CEPH_XATTR_NAME(_type, _name), \ 406 .name_size = sizeof(CEPH_XATTR_NAME(_type, _name)), \ 407 .getxattr_cb = ceph_vxattrcb_ ## _type ## _ ## _name, \ 408 .exists_cb = ceph_vxattrcb_quota_exists, \ 409 .flags = VXATTR_FLAG_HIDDEN, \ 410 } 411 412static struct ceph_vxattr ceph_dir_vxattrs[] = { 413 { 414 .name = "ceph.dir.layout", 415 .name_size = sizeof("ceph.dir.layout"), 416 .getxattr_cb = ceph_vxattrcb_layout, 417 .exists_cb = ceph_vxattrcb_layout_exists, 418 .flags = VXATTR_FLAG_HIDDEN, 419 }, 420 XATTR_LAYOUT_FIELD(dir, layout, stripe_unit), 421 XATTR_LAYOUT_FIELD(dir, layout, stripe_count), 422 XATTR_LAYOUT_FIELD(dir, layout, object_size), 423 XATTR_LAYOUT_FIELD(dir, layout, pool), 424 XATTR_LAYOUT_FIELD(dir, layout, pool_namespace), 425 XATTR_NAME_CEPH(dir, entries, VXATTR_FLAG_DIRSTAT), 426 XATTR_NAME_CEPH(dir, files, VXATTR_FLAG_DIRSTAT), 427 XATTR_NAME_CEPH(dir, subdirs, VXATTR_FLAG_DIRSTAT), 428 XATTR_RSTAT_FIELD(dir, rentries), 429 XATTR_RSTAT_FIELD(dir, rfiles), 430 XATTR_RSTAT_FIELD(dir, rsubdirs), 431 XATTR_RSTAT_FIELD(dir, rsnaps), 432 XATTR_RSTAT_FIELD(dir, rbytes), 433 XATTR_RSTAT_FIELD_UPDATABLE(dir, rctime), 434 { 435 .name = "ceph.dir.pin", 436 .name_size = sizeof("ceph.dir.pin"), 437 .getxattr_cb = ceph_vxattrcb_dir_pin, 438 .exists_cb = ceph_vxattrcb_dir_pin_exists, 439 .flags = VXATTR_FLAG_HIDDEN, 440 }, 441 { 442 .name = "ceph.quota", 443 .name_size = sizeof("ceph.quota"), 444 .getxattr_cb = ceph_vxattrcb_quota, 445 .exists_cb = ceph_vxattrcb_quota_exists, 446 .flags = VXATTR_FLAG_HIDDEN, 447 }, 448 XATTR_QUOTA_FIELD(quota, max_bytes), 449 XATTR_QUOTA_FIELD(quota, max_files), 450 { 451 .name = "ceph.snap.btime", 452 .name_size = sizeof("ceph.snap.btime"), 453 .getxattr_cb = ceph_vxattrcb_snap_btime, 454 .exists_cb = ceph_vxattrcb_snap_btime_exists, 455 .flags = VXATTR_FLAG_READONLY, 456 }, 457 { 458 .name = "ceph.caps", 459 .name_size = sizeof("ceph.caps"), 460 .getxattr_cb = ceph_vxattrcb_caps, 461 .exists_cb = NULL, 462 .flags = VXATTR_FLAG_HIDDEN, 463 }, 464 { .name = NULL, 0 } /* Required table terminator */ 465}; 466 467/* files */ 468 469static struct ceph_vxattr ceph_file_vxattrs[] = { 470 { 471 .name = "ceph.file.layout", 472 .name_size = sizeof("ceph.file.layout"), 473 .getxattr_cb = ceph_vxattrcb_layout, 474 .exists_cb = ceph_vxattrcb_layout_exists, 475 .flags = VXATTR_FLAG_HIDDEN, 476 }, 477 XATTR_LAYOUT_FIELD(file, layout, stripe_unit), 478 XATTR_LAYOUT_FIELD(file, layout, stripe_count), 479 XATTR_LAYOUT_FIELD(file, layout, object_size), 480 XATTR_LAYOUT_FIELD(file, layout, pool), 481 XATTR_LAYOUT_FIELD(file, layout, pool_namespace), 482 { 483 .name = "ceph.snap.btime", 484 .name_size = sizeof("ceph.snap.btime"), 485 .getxattr_cb = ceph_vxattrcb_snap_btime, 486 .exists_cb = ceph_vxattrcb_snap_btime_exists, 487 .flags = VXATTR_FLAG_READONLY, 488 }, 489 { 490 .name = "ceph.caps", 491 .name_size = sizeof("ceph.caps"), 492 .getxattr_cb = ceph_vxattrcb_caps, 493 .exists_cb = NULL, 494 .flags = VXATTR_FLAG_HIDDEN, 495 }, 496 { .name = NULL, 0 } /* Required table terminator */ 497}; 498 499static struct ceph_vxattr ceph_common_vxattrs[] = { 500 { 501 .name = "ceph.cluster_fsid", 502 .name_size = sizeof("ceph.cluster_fsid"), 503 .getxattr_cb = ceph_vxattrcb_cluster_fsid, 504 .exists_cb = NULL, 505 .flags = VXATTR_FLAG_READONLY, 506 }, 507 { 508 .name = "ceph.client_id", 509 .name_size = sizeof("ceph.client_id"), 510 .getxattr_cb = ceph_vxattrcb_client_id, 511 .exists_cb = NULL, 512 .flags = VXATTR_FLAG_READONLY, 513 }, 514 { 515 .name = "ceph.auth_mds", 516 .name_size = sizeof("ceph.auth_mds"), 517 .getxattr_cb = ceph_vxattrcb_auth_mds, 518 .exists_cb = NULL, 519 .flags = VXATTR_FLAG_READONLY, 520 }, 521#if IS_ENABLED(CONFIG_FS_ENCRYPTION) 522 { 523 .name = "ceph.fscrypt.auth", 524 .name_size = sizeof("ceph.fscrypt.auth"), 525 .getxattr_cb = ceph_vxattrcb_fscrypt_auth, 526 .exists_cb = ceph_vxattrcb_fscrypt_auth_exists, 527 .flags = VXATTR_FLAG_READONLY, 528 }, 529#endif /* CONFIG_FS_ENCRYPTION */ 530 { .name = NULL, 0 } /* Required table terminator */ 531}; 532 533static struct ceph_vxattr *ceph_inode_vxattrs(struct inode *inode) 534{ 535 if (S_ISDIR(inode->i_mode)) 536 return ceph_dir_vxattrs; 537 else if (S_ISREG(inode->i_mode)) 538 return ceph_file_vxattrs; 539 return NULL; 540} 541 542static struct ceph_vxattr *ceph_match_vxattr(struct inode *inode, 543 const char *name) 544{ 545 struct ceph_vxattr *vxattr = ceph_inode_vxattrs(inode); 546 547 if (vxattr) { 548 while (vxattr->name) { 549 if (!strcmp(vxattr->name, name)) 550 return vxattr; 551 vxattr++; 552 } 553 } 554 555 vxattr = ceph_common_vxattrs; 556 while (vxattr->name) { 557 if (!strcmp(vxattr->name, name)) 558 return vxattr; 559 vxattr++; 560 } 561 562 return NULL; 563} 564 565#define MAX_XATTR_VAL_PRINT_LEN 256 566 567static int __set_xattr(struct ceph_inode_info *ci, 568 const char *name, int name_len, 569 const char *val, int val_len, 570 int flags, int update_xattr, 571 struct ceph_inode_xattr **newxattr) 572{ 573 struct rb_node **p; 574 struct rb_node *parent = NULL; 575 struct ceph_inode_xattr *xattr = NULL; 576 int c; 577 int new = 0; 578 579 p = &ci->i_xattrs.index.rb_node; 580 while (*p) { 581 parent = *p; 582 xattr = rb_entry(parent, struct ceph_inode_xattr, node); 583 c = strncmp(name, xattr->name, min(name_len, xattr->name_len)); 584 if (c < 0) 585 p = &(*p)->rb_left; 586 else if (c > 0) 587 p = &(*p)->rb_right; 588 else { 589 if (name_len == xattr->name_len) 590 break; 591 else if (name_len < xattr->name_len) 592 p = &(*p)->rb_left; 593 else 594 p = &(*p)->rb_right; 595 } 596 xattr = NULL; 597 } 598 599 if (update_xattr) { 600 int err = 0; 601 602 if (xattr && (flags & XATTR_CREATE)) 603 err = -EEXIST; 604 else if (!xattr && (flags & XATTR_REPLACE)) 605 err = -ENODATA; 606 if (err) { 607 kfree(name); 608 kfree(val); 609 kfree(*newxattr); 610 return err; 611 } 612 if (update_xattr < 0) { 613 if (xattr) 614 __remove_xattr(ci, xattr); 615 kfree(name); 616 kfree(*newxattr); 617 return 0; 618 } 619 } 620 621 if (!xattr) { 622 new = 1; 623 xattr = *newxattr; 624 xattr->name = name; 625 xattr->name_len = name_len; 626 xattr->should_free_name = update_xattr; 627 628 ci->i_xattrs.count++; 629 dout("%s count=%d\n", __func__, ci->i_xattrs.count); 630 } else { 631 kfree(*newxattr); 632 *newxattr = NULL; 633 if (xattr->should_free_val) 634 kfree(xattr->val); 635 636 if (update_xattr) { 637 kfree(name); 638 name = xattr->name; 639 } 640 ci->i_xattrs.names_size -= xattr->name_len; 641 ci->i_xattrs.vals_size -= xattr->val_len; 642 } 643 ci->i_xattrs.names_size += name_len; 644 ci->i_xattrs.vals_size += val_len; 645 if (val) 646 xattr->val = val; 647 else 648 xattr->val = ""; 649 650 xattr->val_len = val_len; 651 xattr->dirty = update_xattr; 652 xattr->should_free_val = (val && update_xattr); 653 654 if (new) { 655 rb_link_node(&xattr->node, parent, p); 656 rb_insert_color(&xattr->node, &ci->i_xattrs.index); 657 dout("%s p=%p\n", __func__, p); 658 } 659 660 dout("%s added %llx.%llx xattr %p %.*s=%.*s%s\n", __func__, 661 ceph_vinop(&ci->netfs.inode), xattr, name_len, name, 662 min(val_len, MAX_XATTR_VAL_PRINT_LEN), val, 663 val_len > MAX_XATTR_VAL_PRINT_LEN ? "..." : ""); 664 665 return 0; 666} 667 668static struct ceph_inode_xattr *__get_xattr(struct ceph_inode_info *ci, 669 const char *name) 670{ 671 struct rb_node **p; 672 struct rb_node *parent = NULL; 673 struct ceph_inode_xattr *xattr = NULL; 674 int name_len = strlen(name); 675 int c; 676 677 p = &ci->i_xattrs.index.rb_node; 678 while (*p) { 679 parent = *p; 680 xattr = rb_entry(parent, struct ceph_inode_xattr, node); 681 c = strncmp(name, xattr->name, xattr->name_len); 682 if (c == 0 && name_len > xattr->name_len) 683 c = 1; 684 if (c < 0) 685 p = &(*p)->rb_left; 686 else if (c > 0) 687 p = &(*p)->rb_right; 688 else { 689 int len = min(xattr->val_len, MAX_XATTR_VAL_PRINT_LEN); 690 691 dout("%s %s: found %.*s%s\n", __func__, name, len, 692 xattr->val, xattr->val_len > len ? "..." : ""); 693 return xattr; 694 } 695 } 696 697 dout("%s %s: not found\n", __func__, name); 698 699 return NULL; 700} 701 702static void __free_xattr(struct ceph_inode_xattr *xattr) 703{ 704 BUG_ON(!xattr); 705 706 if (xattr->should_free_name) 707 kfree(xattr->name); 708 if (xattr->should_free_val) 709 kfree(xattr->val); 710 711 kfree(xattr); 712} 713 714static int __remove_xattr(struct ceph_inode_info *ci, 715 struct ceph_inode_xattr *xattr) 716{ 717 if (!xattr) 718 return -ENODATA; 719 720 rb_erase(&xattr->node, &ci->i_xattrs.index); 721 722 if (xattr->should_free_name) 723 kfree(xattr->name); 724 if (xattr->should_free_val) 725 kfree(xattr->val); 726 727 ci->i_xattrs.names_size -= xattr->name_len; 728 ci->i_xattrs.vals_size -= xattr->val_len; 729 ci->i_xattrs.count--; 730 kfree(xattr); 731 732 return 0; 733} 734 735static char *__copy_xattr_names(struct ceph_inode_info *ci, 736 char *dest) 737{ 738 struct rb_node *p; 739 struct ceph_inode_xattr *xattr = NULL; 740 741 p = rb_first(&ci->i_xattrs.index); 742 dout("__copy_xattr_names count=%d\n", ci->i_xattrs.count); 743 744 while (p) { 745 xattr = rb_entry(p, struct ceph_inode_xattr, node); 746 memcpy(dest, xattr->name, xattr->name_len); 747 dest[xattr->name_len] = '\0'; 748 749 dout("dest=%s %p (%s) (%d/%d)\n", dest, xattr, xattr->name, 750 xattr->name_len, ci->i_xattrs.names_size); 751 752 dest += xattr->name_len + 1; 753 p = rb_next(p); 754 } 755 756 return dest; 757} 758 759void __ceph_destroy_xattrs(struct ceph_inode_info *ci) 760{ 761 struct rb_node *p, *tmp; 762 struct ceph_inode_xattr *xattr = NULL; 763 764 p = rb_first(&ci->i_xattrs.index); 765 766 dout("__ceph_destroy_xattrs p=%p\n", p); 767 768 while (p) { 769 xattr = rb_entry(p, struct ceph_inode_xattr, node); 770 tmp = p; 771 p = rb_next(tmp); 772 dout("__ceph_destroy_xattrs next p=%p (%.*s)\n", p, 773 xattr->name_len, xattr->name); 774 rb_erase(tmp, &ci->i_xattrs.index); 775 776 __free_xattr(xattr); 777 } 778 779 ci->i_xattrs.names_size = 0; 780 ci->i_xattrs.vals_size = 0; 781 ci->i_xattrs.index_version = 0; 782 ci->i_xattrs.count = 0; 783 ci->i_xattrs.index = RB_ROOT; 784} 785 786static int __build_xattrs(struct inode *inode) 787 __releases(ci->i_ceph_lock) 788 __acquires(ci->i_ceph_lock) 789{ 790 u32 namelen; 791 u32 numattr = 0; 792 void *p, *end; 793 u32 len; 794 const char *name, *val; 795 struct ceph_inode_info *ci = ceph_inode(inode); 796 u64 xattr_version; 797 struct ceph_inode_xattr **xattrs = NULL; 798 int err = 0; 799 int i; 800 801 dout("__build_xattrs() len=%d\n", 802 ci->i_xattrs.blob ? (int)ci->i_xattrs.blob->vec.iov_len : 0); 803 804 if (ci->i_xattrs.index_version >= ci->i_xattrs.version) 805 return 0; /* already built */ 806 807 __ceph_destroy_xattrs(ci); 808 809start: 810 /* updated internal xattr rb tree */ 811 if (ci->i_xattrs.blob && ci->i_xattrs.blob->vec.iov_len > 4) { 812 p = ci->i_xattrs.blob->vec.iov_base; 813 end = p + ci->i_xattrs.blob->vec.iov_len; 814 ceph_decode_32_safe(&p, end, numattr, bad); 815 xattr_version = ci->i_xattrs.version; 816 spin_unlock(&ci->i_ceph_lock); 817 818 xattrs = kcalloc(numattr, sizeof(struct ceph_inode_xattr *), 819 GFP_NOFS); 820 err = -ENOMEM; 821 if (!xattrs) 822 goto bad_lock; 823 824 for (i = 0; i < numattr; i++) { 825 xattrs[i] = kmalloc(sizeof(struct ceph_inode_xattr), 826 GFP_NOFS); 827 if (!xattrs[i]) 828 goto bad_lock; 829 } 830 831 spin_lock(&ci->i_ceph_lock); 832 if (ci->i_xattrs.version != xattr_version) { 833 /* lost a race, retry */ 834 for (i = 0; i < numattr; i++) 835 kfree(xattrs[i]); 836 kfree(xattrs); 837 xattrs = NULL; 838 goto start; 839 } 840 err = -EIO; 841 while (numattr--) { 842 ceph_decode_32_safe(&p, end, len, bad); 843 namelen = len; 844 name = p; 845 p += len; 846 ceph_decode_32_safe(&p, end, len, bad); 847 val = p; 848 p += len; 849 850 err = __set_xattr(ci, name, namelen, val, len, 851 0, 0, &xattrs[numattr]); 852 853 if (err < 0) 854 goto bad; 855 } 856 kfree(xattrs); 857 } 858 ci->i_xattrs.index_version = ci->i_xattrs.version; 859 ci->i_xattrs.dirty = false; 860 861 return err; 862bad_lock: 863 spin_lock(&ci->i_ceph_lock); 864bad: 865 if (xattrs) { 866 for (i = 0; i < numattr; i++) 867 kfree(xattrs[i]); 868 kfree(xattrs); 869 } 870 ci->i_xattrs.names_size = 0; 871 return err; 872} 873 874static int __get_required_blob_size(struct ceph_inode_info *ci, int name_size, 875 int val_size) 876{ 877 /* 878 * 4 bytes for the length, and additional 4 bytes per each xattr name, 879 * 4 bytes per each value 880 */ 881 int size = 4 + ci->i_xattrs.count*(4 + 4) + 882 ci->i_xattrs.names_size + 883 ci->i_xattrs.vals_size; 884 dout("__get_required_blob_size c=%d names.size=%d vals.size=%d\n", 885 ci->i_xattrs.count, ci->i_xattrs.names_size, 886 ci->i_xattrs.vals_size); 887 888 if (name_size) 889 size += 4 + 4 + name_size + val_size; 890 891 return size; 892} 893 894/* 895 * If there are dirty xattrs, reencode xattrs into the prealloc_blob 896 * and swap into place. It returns the old i_xattrs.blob (or NULL) so 897 * that it can be freed by the caller as the i_ceph_lock is likely to be 898 * held. 899 */ 900struct ceph_buffer *__ceph_build_xattrs_blob(struct ceph_inode_info *ci) 901{ 902 struct rb_node *p; 903 struct ceph_inode_xattr *xattr = NULL; 904 struct ceph_buffer *old_blob = NULL; 905 void *dest; 906 907 dout("__build_xattrs_blob %p\n", &ci->netfs.inode); 908 if (ci->i_xattrs.dirty) { 909 int need = __get_required_blob_size(ci, 0, 0); 910 911 BUG_ON(need > ci->i_xattrs.prealloc_blob->alloc_len); 912 913 p = rb_first(&ci->i_xattrs.index); 914 dest = ci->i_xattrs.prealloc_blob->vec.iov_base; 915 916 ceph_encode_32(&dest, ci->i_xattrs.count); 917 while (p) { 918 xattr = rb_entry(p, struct ceph_inode_xattr, node); 919 920 ceph_encode_32(&dest, xattr->name_len); 921 memcpy(dest, xattr->name, xattr->name_len); 922 dest += xattr->name_len; 923 ceph_encode_32(&dest, xattr->val_len); 924 memcpy(dest, xattr->val, xattr->val_len); 925 dest += xattr->val_len; 926 927 p = rb_next(p); 928 } 929 930 /* adjust buffer len; it may be larger than we need */ 931 ci->i_xattrs.prealloc_blob->vec.iov_len = 932 dest - ci->i_xattrs.prealloc_blob->vec.iov_base; 933 934 if (ci->i_xattrs.blob) 935 old_blob = ci->i_xattrs.blob; 936 ci->i_xattrs.blob = ci->i_xattrs.prealloc_blob; 937 ci->i_xattrs.prealloc_blob = NULL; 938 ci->i_xattrs.dirty = false; 939 ci->i_xattrs.version++; 940 } 941 942 return old_blob; 943} 944 945static inline int __get_request_mask(struct inode *in) { 946 struct ceph_mds_request *req = current->journal_info; 947 int mask = 0; 948 if (req && req->r_target_inode == in) { 949 if (req->r_op == CEPH_MDS_OP_LOOKUP || 950 req->r_op == CEPH_MDS_OP_LOOKUPINO || 951 req->r_op == CEPH_MDS_OP_LOOKUPPARENT || 952 req->r_op == CEPH_MDS_OP_GETATTR) { 953 mask = le32_to_cpu(req->r_args.getattr.mask); 954 } else if (req->r_op == CEPH_MDS_OP_OPEN || 955 req->r_op == CEPH_MDS_OP_CREATE) { 956 mask = le32_to_cpu(req->r_args.open.mask); 957 } 958 } 959 return mask; 960} 961 962ssize_t __ceph_getxattr(struct inode *inode, const char *name, void *value, 963 size_t size) 964{ 965 struct ceph_inode_info *ci = ceph_inode(inode); 966 struct ceph_inode_xattr *xattr; 967 struct ceph_vxattr *vxattr; 968 int req_mask; 969 ssize_t err; 970 971 if (strncmp(name, XATTR_CEPH_PREFIX, XATTR_CEPH_PREFIX_LEN)) 972 goto handle_non_vxattrs; 973 974 /* let's see if a virtual xattr was requested */ 975 vxattr = ceph_match_vxattr(inode, name); 976 if (vxattr) { 977 int mask = 0; 978 if (vxattr->flags & VXATTR_FLAG_RSTAT) 979 mask |= CEPH_STAT_RSTAT; 980 if (vxattr->flags & VXATTR_FLAG_DIRSTAT) 981 mask |= CEPH_CAP_FILE_SHARED; 982 err = ceph_do_getattr(inode, mask, true); 983 if (err) 984 return err; 985 err = -ENODATA; 986 if (!(vxattr->exists_cb && !vxattr->exists_cb(ci))) { 987 err = vxattr->getxattr_cb(ci, value, size); 988 if (size && size < err) 989 err = -ERANGE; 990 } 991 return err; 992 } else { 993 err = ceph_do_getvxattr(inode, name, value, size); 994 /* this would happen with a new client and old server combo */ 995 if (err == -EOPNOTSUPP) 996 err = -ENODATA; 997 return err; 998 } 999handle_non_vxattrs: 1000 req_mask = __get_request_mask(inode); 1001 1002 spin_lock(&ci->i_ceph_lock); 1003 dout("getxattr %p name '%s' ver=%lld index_ver=%lld\n", inode, name, 1004 ci->i_xattrs.version, ci->i_xattrs.index_version); 1005 1006 if (ci->i_xattrs.version == 0 || 1007 !((req_mask & CEPH_CAP_XATTR_SHARED) || 1008 __ceph_caps_issued_mask_metric(ci, CEPH_CAP_XATTR_SHARED, 1))) { 1009 spin_unlock(&ci->i_ceph_lock); 1010 1011 /* security module gets xattr while filling trace */ 1012 if (current->journal_info) { 1013 pr_warn_ratelimited("sync getxattr %p " 1014 "during filling trace\n", inode); 1015 return -EBUSY; 1016 } 1017 1018 /* get xattrs from mds (if we don't already have them) */ 1019 err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR, true); 1020 if (err) 1021 return err; 1022 spin_lock(&ci->i_ceph_lock); 1023 } 1024 1025 err = __build_xattrs(inode); 1026 if (err < 0) 1027 goto out; 1028 1029 err = -ENODATA; /* == ENOATTR */ 1030 xattr = __get_xattr(ci, name); 1031 if (!xattr) 1032 goto out; 1033 1034 err = -ERANGE; 1035 if (size && size < xattr->val_len) 1036 goto out; 1037 1038 err = xattr->val_len; 1039 if (size == 0) 1040 goto out; 1041 1042 memcpy(value, xattr->val, xattr->val_len); 1043 1044 if (current->journal_info && 1045 !strncmp(name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN) && 1046 security_ismaclabel(name + XATTR_SECURITY_PREFIX_LEN)) 1047 ci->i_ceph_flags |= CEPH_I_SEC_INITED; 1048out: 1049 spin_unlock(&ci->i_ceph_lock); 1050 return err; 1051} 1052 1053ssize_t ceph_listxattr(struct dentry *dentry, char *names, size_t size) 1054{ 1055 struct inode *inode = d_inode(dentry); 1056 struct ceph_inode_info *ci = ceph_inode(inode); 1057 bool len_only = (size == 0); 1058 u32 namelen; 1059 int err; 1060 1061 spin_lock(&ci->i_ceph_lock); 1062 dout("listxattr %p ver=%lld index_ver=%lld\n", inode, 1063 ci->i_xattrs.version, ci->i_xattrs.index_version); 1064 1065 if (ci->i_xattrs.version == 0 || 1066 !__ceph_caps_issued_mask_metric(ci, CEPH_CAP_XATTR_SHARED, 1)) { 1067 spin_unlock(&ci->i_ceph_lock); 1068 err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR, true); 1069 if (err) 1070 return err; 1071 spin_lock(&ci->i_ceph_lock); 1072 } 1073 1074 err = __build_xattrs(inode); 1075 if (err < 0) 1076 goto out; 1077 1078 /* add 1 byte for each xattr due to the null termination */ 1079 namelen = ci->i_xattrs.names_size + ci->i_xattrs.count; 1080 if (!len_only) { 1081 if (namelen > size) { 1082 err = -ERANGE; 1083 goto out; 1084 } 1085 names = __copy_xattr_names(ci, names); 1086 size -= namelen; 1087 } 1088 err = namelen; 1089out: 1090 spin_unlock(&ci->i_ceph_lock); 1091 return err; 1092} 1093 1094static int ceph_sync_setxattr(struct inode *inode, const char *name, 1095 const char *value, size_t size, int flags) 1096{ 1097 struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb); 1098 struct ceph_inode_info *ci = ceph_inode(inode); 1099 struct ceph_mds_request *req; 1100 struct ceph_mds_client *mdsc = fsc->mdsc; 1101 struct ceph_osd_client *osdc = &fsc->client->osdc; 1102 struct ceph_pagelist *pagelist = NULL; 1103 int op = CEPH_MDS_OP_SETXATTR; 1104 int err; 1105 1106 if (size > 0) { 1107 /* copy value into pagelist */ 1108 pagelist = ceph_pagelist_alloc(GFP_NOFS); 1109 if (!pagelist) 1110 return -ENOMEM; 1111 1112 err = ceph_pagelist_append(pagelist, value, size); 1113 if (err) 1114 goto out; 1115 } else if (!value) { 1116 if (flags & CEPH_XATTR_REPLACE) 1117 op = CEPH_MDS_OP_RMXATTR; 1118 else 1119 flags |= CEPH_XATTR_REMOVE; 1120 } 1121 1122 dout("setxattr value size: %zu\n", size); 1123 1124 /* do request */ 1125 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); 1126 if (IS_ERR(req)) { 1127 err = PTR_ERR(req); 1128 goto out; 1129 } 1130 1131 req->r_path2 = kstrdup(name, GFP_NOFS); 1132 if (!req->r_path2) { 1133 ceph_mdsc_put_request(req); 1134 err = -ENOMEM; 1135 goto out; 1136 } 1137 1138 if (op == CEPH_MDS_OP_SETXATTR) { 1139 req->r_args.setxattr.flags = cpu_to_le32(flags); 1140 req->r_args.setxattr.osdmap_epoch = 1141 cpu_to_le32(osdc->osdmap->epoch); 1142 req->r_pagelist = pagelist; 1143 pagelist = NULL; 1144 } 1145 1146 req->r_inode = inode; 1147 ihold(inode); 1148 req->r_num_caps = 1; 1149 req->r_inode_drop = CEPH_CAP_XATTR_SHARED; 1150 1151 dout("xattr.ver (before): %lld\n", ci->i_xattrs.version); 1152 err = ceph_mdsc_do_request(mdsc, NULL, req); 1153 ceph_mdsc_put_request(req); 1154 dout("xattr.ver (after): %lld\n", ci->i_xattrs.version); 1155 1156out: 1157 if (pagelist) 1158 ceph_pagelist_release(pagelist); 1159 return err; 1160} 1161 1162int __ceph_setxattr(struct inode *inode, const char *name, 1163 const void *value, size_t size, int flags) 1164{ 1165 struct ceph_vxattr *vxattr; 1166 struct ceph_inode_info *ci = ceph_inode(inode); 1167 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc; 1168 struct ceph_cap_flush *prealloc_cf = NULL; 1169 struct ceph_buffer *old_blob = NULL; 1170 int issued; 1171 int err; 1172 int dirty = 0; 1173 int name_len = strlen(name); 1174 int val_len = size; 1175 char *newname = NULL; 1176 char *newval = NULL; 1177 struct ceph_inode_xattr *xattr = NULL; 1178 int required_blob_size; 1179 bool check_realm = false; 1180 bool lock_snap_rwsem = false; 1181 1182 if (ceph_snap(inode) != CEPH_NOSNAP) 1183 return -EROFS; 1184 1185 vxattr = ceph_match_vxattr(inode, name); 1186 if (vxattr) { 1187 if (vxattr->flags & VXATTR_FLAG_READONLY) 1188 return -EOPNOTSUPP; 1189 if (value && !strncmp(vxattr->name, "ceph.quota", 10)) 1190 check_realm = true; 1191 } 1192 1193 /* pass any unhandled ceph.* xattrs through to the MDS */ 1194 if (!strncmp(name, XATTR_CEPH_PREFIX, XATTR_CEPH_PREFIX_LEN)) 1195 goto do_sync_unlocked; 1196 1197 /* preallocate memory for xattr name, value, index node */ 1198 err = -ENOMEM; 1199 newname = kmemdup(name, name_len + 1, GFP_NOFS); 1200 if (!newname) 1201 goto out; 1202 1203 if (val_len) { 1204 newval = kmemdup(value, val_len, GFP_NOFS); 1205 if (!newval) 1206 goto out; 1207 } 1208 1209 xattr = kmalloc(sizeof(struct ceph_inode_xattr), GFP_NOFS); 1210 if (!xattr) 1211 goto out; 1212 1213 prealloc_cf = ceph_alloc_cap_flush(); 1214 if (!prealloc_cf) 1215 goto out; 1216 1217 spin_lock(&ci->i_ceph_lock); 1218retry: 1219 issued = __ceph_caps_issued(ci, NULL); 1220 required_blob_size = __get_required_blob_size(ci, name_len, val_len); 1221 if ((ci->i_xattrs.version == 0) || !(issued & CEPH_CAP_XATTR_EXCL) || 1222 (required_blob_size > mdsc->mdsmap->m_max_xattr_size)) { 1223 dout("%s do sync setxattr: version: %llu size: %d max: %llu\n", 1224 __func__, ci->i_xattrs.version, required_blob_size, 1225 mdsc->mdsmap->m_max_xattr_size); 1226 goto do_sync; 1227 } 1228 1229 if (!lock_snap_rwsem && !ci->i_head_snapc) { 1230 lock_snap_rwsem = true; 1231 if (!down_read_trylock(&mdsc->snap_rwsem)) { 1232 spin_unlock(&ci->i_ceph_lock); 1233 down_read(&mdsc->snap_rwsem); 1234 spin_lock(&ci->i_ceph_lock); 1235 goto retry; 1236 } 1237 } 1238 1239 dout("setxattr %p name '%s' issued %s\n", inode, name, 1240 ceph_cap_string(issued)); 1241 __build_xattrs(inode); 1242 1243 if (!ci->i_xattrs.prealloc_blob || 1244 required_blob_size > ci->i_xattrs.prealloc_blob->alloc_len) { 1245 struct ceph_buffer *blob; 1246 1247 spin_unlock(&ci->i_ceph_lock); 1248 ceph_buffer_put(old_blob); /* Shouldn't be required */ 1249 dout(" pre-allocating new blob size=%d\n", required_blob_size); 1250 blob = ceph_buffer_new(required_blob_size, GFP_NOFS); 1251 if (!blob) 1252 goto do_sync_unlocked; 1253 spin_lock(&ci->i_ceph_lock); 1254 /* prealloc_blob can't be released while holding i_ceph_lock */ 1255 if (ci->i_xattrs.prealloc_blob) 1256 old_blob = ci->i_xattrs.prealloc_blob; 1257 ci->i_xattrs.prealloc_blob = blob; 1258 goto retry; 1259 } 1260 1261 err = __set_xattr(ci, newname, name_len, newval, val_len, 1262 flags, value ? 1 : -1, &xattr); 1263 1264 if (!err) { 1265 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_XATTR_EXCL, 1266 &prealloc_cf); 1267 ci->i_xattrs.dirty = true; 1268 inode_set_ctime_current(inode); 1269 } 1270 1271 spin_unlock(&ci->i_ceph_lock); 1272 ceph_buffer_put(old_blob); 1273 if (lock_snap_rwsem) 1274 up_read(&mdsc->snap_rwsem); 1275 if (dirty) 1276 __mark_inode_dirty(inode, dirty); 1277 ceph_free_cap_flush(prealloc_cf); 1278 return err; 1279 1280do_sync: 1281 spin_unlock(&ci->i_ceph_lock); 1282do_sync_unlocked: 1283 if (lock_snap_rwsem) 1284 up_read(&mdsc->snap_rwsem); 1285 1286 /* security module set xattr while filling trace */ 1287 if (current->journal_info) { 1288 pr_warn_ratelimited("sync setxattr %p " 1289 "during filling trace\n", inode); 1290 err = -EBUSY; 1291 } else { 1292 err = ceph_sync_setxattr(inode, name, value, size, flags); 1293 if (err >= 0 && check_realm) { 1294 /* check if snaprealm was created for quota inode */ 1295 spin_lock(&ci->i_ceph_lock); 1296 if ((ci->i_max_files || ci->i_max_bytes) && 1297 !(ci->i_snap_realm && 1298 ci->i_snap_realm->ino == ci->i_vino.ino)) 1299 err = -EOPNOTSUPP; 1300 spin_unlock(&ci->i_ceph_lock); 1301 } 1302 } 1303out: 1304 ceph_free_cap_flush(prealloc_cf); 1305 kfree(newname); 1306 kfree(newval); 1307 kfree(xattr); 1308 return err; 1309} 1310 1311static int ceph_get_xattr_handler(const struct xattr_handler *handler, 1312 struct dentry *dentry, struct inode *inode, 1313 const char *name, void *value, size_t size) 1314{ 1315 if (!ceph_is_valid_xattr(name)) 1316 return -EOPNOTSUPP; 1317 return __ceph_getxattr(inode, name, value, size); 1318} 1319 1320static int ceph_set_xattr_handler(const struct xattr_handler *handler, 1321 struct mnt_idmap *idmap, 1322 struct dentry *unused, struct inode *inode, 1323 const char *name, const void *value, 1324 size_t size, int flags) 1325{ 1326 if (!ceph_is_valid_xattr(name)) 1327 return -EOPNOTSUPP; 1328 return __ceph_setxattr(inode, name, value, size, flags); 1329} 1330 1331static const struct xattr_handler ceph_other_xattr_handler = { 1332 .prefix = "", /* match any name => handlers called with full name */ 1333 .get = ceph_get_xattr_handler, 1334 .set = ceph_set_xattr_handler, 1335}; 1336 1337#ifdef CONFIG_SECURITY 1338bool ceph_security_xattr_wanted(struct inode *in) 1339{ 1340 return in->i_security != NULL; 1341} 1342 1343bool ceph_security_xattr_deadlock(struct inode *in) 1344{ 1345 struct ceph_inode_info *ci; 1346 bool ret; 1347 if (!in->i_security) 1348 return false; 1349 ci = ceph_inode(in); 1350 spin_lock(&ci->i_ceph_lock); 1351 ret = !(ci->i_ceph_flags & CEPH_I_SEC_INITED) && 1352 !(ci->i_xattrs.version > 0 && 1353 __ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 0)); 1354 spin_unlock(&ci->i_ceph_lock); 1355 return ret; 1356} 1357 1358#ifdef CONFIG_CEPH_FS_SECURITY_LABEL 1359int ceph_security_init_secctx(struct dentry *dentry, umode_t mode, 1360 struct ceph_acl_sec_ctx *as_ctx) 1361{ 1362 struct ceph_pagelist *pagelist = as_ctx->pagelist; 1363 const char *name; 1364 size_t name_len; 1365 int err; 1366 1367 err = security_dentry_init_security(dentry, mode, &dentry->d_name, 1368 &name, &as_ctx->sec_ctx, 1369 &as_ctx->sec_ctxlen); 1370 if (err < 0) { 1371 WARN_ON_ONCE(err != -EOPNOTSUPP); 1372 err = 0; /* do nothing */ 1373 goto out; 1374 } 1375 1376 err = -ENOMEM; 1377 if (!pagelist) { 1378 pagelist = ceph_pagelist_alloc(GFP_KERNEL); 1379 if (!pagelist) 1380 goto out; 1381 err = ceph_pagelist_reserve(pagelist, PAGE_SIZE); 1382 if (err) 1383 goto out; 1384 ceph_pagelist_encode_32(pagelist, 1); 1385 } 1386 1387 /* 1388 * FIXME: Make security_dentry_init_security() generic. Currently 1389 * It only supports single security module and only selinux has 1390 * dentry_init_security hook. 1391 */ 1392 name_len = strlen(name); 1393 err = ceph_pagelist_reserve(pagelist, 1394 4 * 2 + name_len + as_ctx->sec_ctxlen); 1395 if (err) 1396 goto out; 1397 1398 if (as_ctx->pagelist) { 1399 /* update count of KV pairs */ 1400 BUG_ON(pagelist->length <= sizeof(__le32)); 1401 if (list_is_singular(&pagelist->head)) { 1402 le32_add_cpu((__le32*)pagelist->mapped_tail, 1); 1403 } else { 1404 struct page *page = list_first_entry(&pagelist->head, 1405 struct page, lru); 1406 void *addr = kmap_atomic(page); 1407 le32_add_cpu((__le32*)addr, 1); 1408 kunmap_atomic(addr); 1409 } 1410 } else { 1411 as_ctx->pagelist = pagelist; 1412 } 1413 1414 ceph_pagelist_encode_32(pagelist, name_len); 1415 ceph_pagelist_append(pagelist, name, name_len); 1416 1417 ceph_pagelist_encode_32(pagelist, as_ctx->sec_ctxlen); 1418 ceph_pagelist_append(pagelist, as_ctx->sec_ctx, as_ctx->sec_ctxlen); 1419 1420 err = 0; 1421out: 1422 if (pagelist && !as_ctx->pagelist) 1423 ceph_pagelist_release(pagelist); 1424 return err; 1425} 1426#endif /* CONFIG_CEPH_FS_SECURITY_LABEL */ 1427#endif /* CONFIG_SECURITY */ 1428 1429void ceph_release_acl_sec_ctx(struct ceph_acl_sec_ctx *as_ctx) 1430{ 1431#ifdef CONFIG_CEPH_FS_POSIX_ACL 1432 posix_acl_release(as_ctx->acl); 1433 posix_acl_release(as_ctx->default_acl); 1434#endif 1435#ifdef CONFIG_CEPH_FS_SECURITY_LABEL 1436 security_release_secctx(as_ctx->sec_ctx, as_ctx->sec_ctxlen); 1437#endif 1438#ifdef CONFIG_FS_ENCRYPTION 1439 kfree(as_ctx->fscrypt_auth); 1440#endif 1441 if (as_ctx->pagelist) 1442 ceph_pagelist_release(as_ctx->pagelist); 1443} 1444 1445/* 1446 * List of handlers for synthetic system.* attributes. Other 1447 * attributes are handled directly. 1448 */ 1449const struct xattr_handler *ceph_xattr_handlers[] = { 1450 &ceph_other_xattr_handler, 1451 NULL, 1452}; 1453