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_fs_client(ci->netfs.inode.i_sb); 61 struct ceph_client *cl = fsc->client; 62 struct ceph_osd_client *osdc = &fsc->client->osdc; 63 struct ceph_string *pool_ns; 64 s64 pool = ci->i_layout.pool_id; 65 const char *pool_name; 66 const char *ns_field = " pool_namespace="; 67 char buf[128]; 68 size_t len, total_len = 0; 69 ssize_t ret; 70 71 pool_ns = ceph_try_get_string(ci->i_layout.pool_ns); 72 73 doutc(cl, "%p\n", &ci->netfs.inode); 74 down_read(&osdc->lock); 75 pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, pool); 76 if (pool_name) { 77 len = snprintf(buf, sizeof(buf), 78 "stripe_unit=%u stripe_count=%u object_size=%u pool=", 79 ci->i_layout.stripe_unit, ci->i_layout.stripe_count, 80 ci->i_layout.object_size); 81 total_len = len + strlen(pool_name); 82 } else { 83 len = snprintf(buf, sizeof(buf), 84 "stripe_unit=%u stripe_count=%u object_size=%u pool=%lld", 85 ci->i_layout.stripe_unit, ci->i_layout.stripe_count, 86 ci->i_layout.object_size, pool); 87 total_len = len; 88 } 89 90 if (pool_ns) 91 total_len += strlen(ns_field) + pool_ns->len; 92 93 ret = total_len; 94 if (size >= total_len) { 95 memcpy(val, buf, len); 96 ret = len; 97 if (pool_name) { 98 len = strlen(pool_name); 99 memcpy(val + ret, pool_name, len); 100 ret += len; 101 } 102 if (pool_ns) { 103 len = strlen(ns_field); 104 memcpy(val + ret, ns_field, len); 105 ret += len; 106 memcpy(val + ret, pool_ns->str, pool_ns->len); 107 ret += pool_ns->len; 108 } 109 } 110 up_read(&osdc->lock); 111 ceph_put_string(pool_ns); 112 return ret; 113} 114 115/* 116 * The convention with strings in xattrs is that they should not be NULL 117 * terminated, since we're returning the length with them. snprintf always 118 * NULL terminates however, so call it on a temporary buffer and then memcpy 119 * the result into place. 120 */ 121static __printf(3, 4) 122int ceph_fmt_xattr(char *val, size_t size, const char *fmt, ...) 123{ 124 int ret; 125 va_list args; 126 char buf[96]; /* NB: reevaluate size if new vxattrs are added */ 127 128 va_start(args, fmt); 129 ret = vsnprintf(buf, size ? sizeof(buf) : 0, fmt, args); 130 va_end(args); 131 132 /* Sanity check */ 133 if (size && ret + 1 > sizeof(buf)) { 134 WARN_ONCE(true, "Returned length too big (%d)", ret); 135 return -E2BIG; 136 } 137 138 if (ret <= size) 139 memcpy(val, buf, ret); 140 return ret; 141} 142 143static ssize_t ceph_vxattrcb_layout_stripe_unit(struct ceph_inode_info *ci, 144 char *val, size_t size) 145{ 146 return ceph_fmt_xattr(val, size, "%u", ci->i_layout.stripe_unit); 147} 148 149static ssize_t ceph_vxattrcb_layout_stripe_count(struct ceph_inode_info *ci, 150 char *val, size_t size) 151{ 152 return ceph_fmt_xattr(val, size, "%u", ci->i_layout.stripe_count); 153} 154 155static ssize_t ceph_vxattrcb_layout_object_size(struct ceph_inode_info *ci, 156 char *val, size_t size) 157{ 158 return ceph_fmt_xattr(val, size, "%u", ci->i_layout.object_size); 159} 160 161static ssize_t ceph_vxattrcb_layout_pool(struct ceph_inode_info *ci, 162 char *val, size_t size) 163{ 164 ssize_t ret; 165 struct ceph_fs_client *fsc = ceph_sb_to_fs_client(ci->netfs.inode.i_sb); 166 struct ceph_osd_client *osdc = &fsc->client->osdc; 167 s64 pool = ci->i_layout.pool_id; 168 const char *pool_name; 169 170 down_read(&osdc->lock); 171 pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, pool); 172 if (pool_name) { 173 ret = strlen(pool_name); 174 if (ret <= size) 175 memcpy(val, pool_name, ret); 176 } else { 177 ret = ceph_fmt_xattr(val, size, "%lld", pool); 178 } 179 up_read(&osdc->lock); 180 return ret; 181} 182 183static ssize_t ceph_vxattrcb_layout_pool_namespace(struct ceph_inode_info *ci, 184 char *val, size_t size) 185{ 186 ssize_t ret = 0; 187 struct ceph_string *ns = ceph_try_get_string(ci->i_layout.pool_ns); 188 189 if (ns) { 190 ret = ns->len; 191 if (ret <= size) 192 memcpy(val, ns->str, ret); 193 ceph_put_string(ns); 194 } 195 return ret; 196} 197 198/* directories */ 199 200static ssize_t ceph_vxattrcb_dir_entries(struct ceph_inode_info *ci, char *val, 201 size_t size) 202{ 203 return ceph_fmt_xattr(val, size, "%lld", ci->i_files + ci->i_subdirs); 204} 205 206static ssize_t ceph_vxattrcb_dir_files(struct ceph_inode_info *ci, char *val, 207 size_t size) 208{ 209 return ceph_fmt_xattr(val, size, "%lld", ci->i_files); 210} 211 212static ssize_t ceph_vxattrcb_dir_subdirs(struct ceph_inode_info *ci, char *val, 213 size_t size) 214{ 215 return ceph_fmt_xattr(val, size, "%lld", ci->i_subdirs); 216} 217 218static ssize_t ceph_vxattrcb_dir_rentries(struct ceph_inode_info *ci, char *val, 219 size_t size) 220{ 221 return ceph_fmt_xattr(val, size, "%lld", 222 ci->i_rfiles + ci->i_rsubdirs); 223} 224 225static ssize_t ceph_vxattrcb_dir_rfiles(struct ceph_inode_info *ci, char *val, 226 size_t size) 227{ 228 return ceph_fmt_xattr(val, size, "%lld", ci->i_rfiles); 229} 230 231static ssize_t ceph_vxattrcb_dir_rsubdirs(struct ceph_inode_info *ci, char *val, 232 size_t size) 233{ 234 return ceph_fmt_xattr(val, size, "%lld", ci->i_rsubdirs); 235} 236 237static ssize_t ceph_vxattrcb_dir_rsnaps(struct ceph_inode_info *ci, char *val, 238 size_t size) 239{ 240 return ceph_fmt_xattr(val, size, "%lld", ci->i_rsnaps); 241} 242 243static ssize_t ceph_vxattrcb_dir_rbytes(struct ceph_inode_info *ci, char *val, 244 size_t size) 245{ 246 return ceph_fmt_xattr(val, size, "%lld", ci->i_rbytes); 247} 248 249static ssize_t ceph_vxattrcb_dir_rctime(struct ceph_inode_info *ci, char *val, 250 size_t size) 251{ 252 return ceph_fmt_xattr(val, size, "%lld.%09ld", ci->i_rctime.tv_sec, 253 ci->i_rctime.tv_nsec); 254} 255 256/* dir pin */ 257static bool ceph_vxattrcb_dir_pin_exists(struct ceph_inode_info *ci) 258{ 259 return ci->i_dir_pin != -ENODATA; 260} 261 262static ssize_t ceph_vxattrcb_dir_pin(struct ceph_inode_info *ci, char *val, 263 size_t size) 264{ 265 return ceph_fmt_xattr(val, size, "%d", (int)ci->i_dir_pin); 266} 267 268/* quotas */ 269static bool ceph_vxattrcb_quota_exists(struct ceph_inode_info *ci) 270{ 271 bool ret = false; 272 spin_lock(&ci->i_ceph_lock); 273 if ((ci->i_max_files || ci->i_max_bytes) && 274 ci->i_vino.snap == CEPH_NOSNAP && 275 ci->i_snap_realm && 276 ci->i_snap_realm->ino == ci->i_vino.ino) 277 ret = true; 278 spin_unlock(&ci->i_ceph_lock); 279 return ret; 280} 281 282static ssize_t ceph_vxattrcb_quota(struct ceph_inode_info *ci, char *val, 283 size_t size) 284{ 285 return ceph_fmt_xattr(val, size, "max_bytes=%llu max_files=%llu", 286 ci->i_max_bytes, ci->i_max_files); 287} 288 289static ssize_t ceph_vxattrcb_quota_max_bytes(struct ceph_inode_info *ci, 290 char *val, size_t size) 291{ 292 return ceph_fmt_xattr(val, size, "%llu", ci->i_max_bytes); 293} 294 295static ssize_t ceph_vxattrcb_quota_max_files(struct ceph_inode_info *ci, 296 char *val, size_t size) 297{ 298 return ceph_fmt_xattr(val, size, "%llu", ci->i_max_files); 299} 300 301/* snapshots */ 302static bool ceph_vxattrcb_snap_btime_exists(struct ceph_inode_info *ci) 303{ 304 return (ci->i_snap_btime.tv_sec != 0 || ci->i_snap_btime.tv_nsec != 0); 305} 306 307static ssize_t ceph_vxattrcb_snap_btime(struct ceph_inode_info *ci, char *val, 308 size_t size) 309{ 310 return ceph_fmt_xattr(val, size, "%lld.%09ld", ci->i_snap_btime.tv_sec, 311 ci->i_snap_btime.tv_nsec); 312} 313 314static ssize_t ceph_vxattrcb_cluster_fsid(struct ceph_inode_info *ci, 315 char *val, size_t size) 316{ 317 struct ceph_fs_client *fsc = ceph_sb_to_fs_client(ci->netfs.inode.i_sb); 318 319 return ceph_fmt_xattr(val, size, "%pU", &fsc->client->fsid); 320} 321 322static ssize_t ceph_vxattrcb_client_id(struct ceph_inode_info *ci, 323 char *val, size_t size) 324{ 325 struct ceph_fs_client *fsc = ceph_sb_to_fs_client(ci->netfs.inode.i_sb); 326 327 return ceph_fmt_xattr(val, size, "client%lld", 328 ceph_client_gid(fsc->client)); 329} 330 331static ssize_t ceph_vxattrcb_caps(struct ceph_inode_info *ci, char *val, 332 size_t size) 333{ 334 int issued; 335 336 spin_lock(&ci->i_ceph_lock); 337 issued = __ceph_caps_issued(ci, NULL); 338 spin_unlock(&ci->i_ceph_lock); 339 340 return ceph_fmt_xattr(val, size, "%s/0x%x", 341 ceph_cap_string(issued), issued); 342} 343 344static ssize_t ceph_vxattrcb_auth_mds(struct ceph_inode_info *ci, 345 char *val, size_t size) 346{ 347 int ret; 348 349 spin_lock(&ci->i_ceph_lock); 350 ret = ceph_fmt_xattr(val, size, "%d", 351 ci->i_auth_cap ? ci->i_auth_cap->session->s_mds : -1); 352 spin_unlock(&ci->i_ceph_lock); 353 return ret; 354} 355 356#if IS_ENABLED(CONFIG_FS_ENCRYPTION) 357static bool ceph_vxattrcb_fscrypt_auth_exists(struct ceph_inode_info *ci) 358{ 359 return ci->fscrypt_auth_len; 360} 361 362static ssize_t ceph_vxattrcb_fscrypt_auth(struct ceph_inode_info *ci, 363 char *val, size_t size) 364{ 365 if (size) { 366 if (size < ci->fscrypt_auth_len) 367 return -ERANGE; 368 memcpy(val, ci->fscrypt_auth, ci->fscrypt_auth_len); 369 } 370 return ci->fscrypt_auth_len; 371} 372#endif /* CONFIG_FS_ENCRYPTION */ 373 374#define CEPH_XATTR_NAME(_type, _name) XATTR_CEPH_PREFIX #_type "." #_name 375#define CEPH_XATTR_NAME2(_type, _name, _name2) \ 376 XATTR_CEPH_PREFIX #_type "." #_name "." #_name2 377 378#define XATTR_NAME_CEPH(_type, _name, _flags) \ 379 { \ 380 .name = CEPH_XATTR_NAME(_type, _name), \ 381 .name_size = sizeof (CEPH_XATTR_NAME(_type, _name)), \ 382 .getxattr_cb = ceph_vxattrcb_ ## _type ## _ ## _name, \ 383 .exists_cb = NULL, \ 384 .flags = (VXATTR_FLAG_READONLY | _flags), \ 385 } 386#define XATTR_RSTAT_FIELD(_type, _name) \ 387 XATTR_NAME_CEPH(_type, _name, VXATTR_FLAG_RSTAT) 388#define XATTR_RSTAT_FIELD_UPDATABLE(_type, _name) \ 389 { \ 390 .name = CEPH_XATTR_NAME(_type, _name), \ 391 .name_size = sizeof (CEPH_XATTR_NAME(_type, _name)), \ 392 .getxattr_cb = ceph_vxattrcb_ ## _type ## _ ## _name, \ 393 .exists_cb = NULL, \ 394 .flags = VXATTR_FLAG_RSTAT, \ 395 } 396#define XATTR_LAYOUT_FIELD(_type, _name, _field) \ 397 { \ 398 .name = CEPH_XATTR_NAME2(_type, _name, _field), \ 399 .name_size = sizeof (CEPH_XATTR_NAME2(_type, _name, _field)), \ 400 .getxattr_cb = ceph_vxattrcb_ ## _name ## _ ## _field, \ 401 .exists_cb = ceph_vxattrcb_layout_exists, \ 402 .flags = VXATTR_FLAG_HIDDEN, \ 403 } 404#define XATTR_QUOTA_FIELD(_type, _name) \ 405 { \ 406 .name = CEPH_XATTR_NAME(_type, _name), \ 407 .name_size = sizeof(CEPH_XATTR_NAME(_type, _name)), \ 408 .getxattr_cb = ceph_vxattrcb_ ## _type ## _ ## _name, \ 409 .exists_cb = ceph_vxattrcb_quota_exists, \ 410 .flags = VXATTR_FLAG_HIDDEN, \ 411 } 412 413static struct ceph_vxattr ceph_dir_vxattrs[] = { 414 { 415 .name = "ceph.dir.layout", 416 .name_size = sizeof("ceph.dir.layout"), 417 .getxattr_cb = ceph_vxattrcb_layout, 418 .exists_cb = ceph_vxattrcb_layout_exists, 419 .flags = VXATTR_FLAG_HIDDEN, 420 }, 421 XATTR_LAYOUT_FIELD(dir, layout, stripe_unit), 422 XATTR_LAYOUT_FIELD(dir, layout, stripe_count), 423 XATTR_LAYOUT_FIELD(dir, layout, object_size), 424 XATTR_LAYOUT_FIELD(dir, layout, pool), 425 XATTR_LAYOUT_FIELD(dir, layout, pool_namespace), 426 XATTR_NAME_CEPH(dir, entries, VXATTR_FLAG_DIRSTAT), 427 XATTR_NAME_CEPH(dir, files, VXATTR_FLAG_DIRSTAT), 428 XATTR_NAME_CEPH(dir, subdirs, VXATTR_FLAG_DIRSTAT), 429 XATTR_RSTAT_FIELD(dir, rentries), 430 XATTR_RSTAT_FIELD(dir, rfiles), 431 XATTR_RSTAT_FIELD(dir, rsubdirs), 432 XATTR_RSTAT_FIELD(dir, rsnaps), 433 XATTR_RSTAT_FIELD(dir, rbytes), 434 XATTR_RSTAT_FIELD_UPDATABLE(dir, rctime), 435 { 436 .name = "ceph.dir.pin", 437 .name_size = sizeof("ceph.dir.pin"), 438 .getxattr_cb = ceph_vxattrcb_dir_pin, 439 .exists_cb = ceph_vxattrcb_dir_pin_exists, 440 .flags = VXATTR_FLAG_HIDDEN, 441 }, 442 { 443 .name = "ceph.quota", 444 .name_size = sizeof("ceph.quota"), 445 .getxattr_cb = ceph_vxattrcb_quota, 446 .exists_cb = ceph_vxattrcb_quota_exists, 447 .flags = VXATTR_FLAG_HIDDEN, 448 }, 449 XATTR_QUOTA_FIELD(quota, max_bytes), 450 XATTR_QUOTA_FIELD(quota, max_files), 451 { 452 .name = "ceph.snap.btime", 453 .name_size = sizeof("ceph.snap.btime"), 454 .getxattr_cb = ceph_vxattrcb_snap_btime, 455 .exists_cb = ceph_vxattrcb_snap_btime_exists, 456 .flags = VXATTR_FLAG_READONLY, 457 }, 458 { 459 .name = "ceph.caps", 460 .name_size = sizeof("ceph.caps"), 461 .getxattr_cb = ceph_vxattrcb_caps, 462 .exists_cb = NULL, 463 .flags = VXATTR_FLAG_HIDDEN, 464 }, 465 { .name = NULL, 0 } /* Required table terminator */ 466}; 467 468/* files */ 469 470static struct ceph_vxattr ceph_file_vxattrs[] = { 471 { 472 .name = "ceph.file.layout", 473 .name_size = sizeof("ceph.file.layout"), 474 .getxattr_cb = ceph_vxattrcb_layout, 475 .exists_cb = ceph_vxattrcb_layout_exists, 476 .flags = VXATTR_FLAG_HIDDEN, 477 }, 478 XATTR_LAYOUT_FIELD(file, layout, stripe_unit), 479 XATTR_LAYOUT_FIELD(file, layout, stripe_count), 480 XATTR_LAYOUT_FIELD(file, layout, object_size), 481 XATTR_LAYOUT_FIELD(file, layout, pool), 482 XATTR_LAYOUT_FIELD(file, layout, pool_namespace), 483 { 484 .name = "ceph.snap.btime", 485 .name_size = sizeof("ceph.snap.btime"), 486 .getxattr_cb = ceph_vxattrcb_snap_btime, 487 .exists_cb = ceph_vxattrcb_snap_btime_exists, 488 .flags = VXATTR_FLAG_READONLY, 489 }, 490 { 491 .name = "ceph.caps", 492 .name_size = sizeof("ceph.caps"), 493 .getxattr_cb = ceph_vxattrcb_caps, 494 .exists_cb = NULL, 495 .flags = VXATTR_FLAG_HIDDEN, 496 }, 497 { .name = NULL, 0 } /* Required table terminator */ 498}; 499 500static struct ceph_vxattr ceph_common_vxattrs[] = { 501 { 502 .name = "ceph.cluster_fsid", 503 .name_size = sizeof("ceph.cluster_fsid"), 504 .getxattr_cb = ceph_vxattrcb_cluster_fsid, 505 .exists_cb = NULL, 506 .flags = VXATTR_FLAG_READONLY, 507 }, 508 { 509 .name = "ceph.client_id", 510 .name_size = sizeof("ceph.client_id"), 511 .getxattr_cb = ceph_vxattrcb_client_id, 512 .exists_cb = NULL, 513 .flags = VXATTR_FLAG_READONLY, 514 }, 515 { 516 .name = "ceph.auth_mds", 517 .name_size = sizeof("ceph.auth_mds"), 518 .getxattr_cb = ceph_vxattrcb_auth_mds, 519 .exists_cb = NULL, 520 .flags = VXATTR_FLAG_READONLY, 521 }, 522#if IS_ENABLED(CONFIG_FS_ENCRYPTION) 523 { 524 .name = "ceph.fscrypt.auth", 525 .name_size = sizeof("ceph.fscrypt.auth"), 526 .getxattr_cb = ceph_vxattrcb_fscrypt_auth, 527 .exists_cb = ceph_vxattrcb_fscrypt_auth_exists, 528 .flags = VXATTR_FLAG_READONLY, 529 }, 530#endif /* CONFIG_FS_ENCRYPTION */ 531 { .name = NULL, 0 } /* Required table terminator */ 532}; 533 534static struct ceph_vxattr *ceph_inode_vxattrs(struct inode *inode) 535{ 536 if (S_ISDIR(inode->i_mode)) 537 return ceph_dir_vxattrs; 538 else if (S_ISREG(inode->i_mode)) 539 return ceph_file_vxattrs; 540 return NULL; 541} 542 543static struct ceph_vxattr *ceph_match_vxattr(struct inode *inode, 544 const char *name) 545{ 546 struct ceph_vxattr *vxattr = ceph_inode_vxattrs(inode); 547 548 if (vxattr) { 549 while (vxattr->name) { 550 if (!strcmp(vxattr->name, name)) 551 return vxattr; 552 vxattr++; 553 } 554 } 555 556 vxattr = ceph_common_vxattrs; 557 while (vxattr->name) { 558 if (!strcmp(vxattr->name, name)) 559 return vxattr; 560 vxattr++; 561 } 562 563 return NULL; 564} 565 566#define MAX_XATTR_VAL_PRINT_LEN 256 567 568static int __set_xattr(struct ceph_inode_info *ci, 569 const char *name, int name_len, 570 const char *val, int val_len, 571 int flags, int update_xattr, 572 struct ceph_inode_xattr **newxattr) 573{ 574 struct inode *inode = &ci->netfs.inode; 575 struct ceph_client *cl = ceph_inode_to_client(inode); 576 struct rb_node **p; 577 struct rb_node *parent = NULL; 578 struct ceph_inode_xattr *xattr = NULL; 579 int c; 580 int new = 0; 581 582 p = &ci->i_xattrs.index.rb_node; 583 while (*p) { 584 parent = *p; 585 xattr = rb_entry(parent, struct ceph_inode_xattr, node); 586 c = strncmp(name, xattr->name, min(name_len, xattr->name_len)); 587 if (c < 0) 588 p = &(*p)->rb_left; 589 else if (c > 0) 590 p = &(*p)->rb_right; 591 else { 592 if (name_len == xattr->name_len) 593 break; 594 else if (name_len < xattr->name_len) 595 p = &(*p)->rb_left; 596 else 597 p = &(*p)->rb_right; 598 } 599 xattr = NULL; 600 } 601 602 if (update_xattr) { 603 int err = 0; 604 605 if (xattr && (flags & XATTR_CREATE)) 606 err = -EEXIST; 607 else if (!xattr && (flags & XATTR_REPLACE)) 608 err = -ENODATA; 609 if (err) { 610 kfree(name); 611 kfree(val); 612 kfree(*newxattr); 613 return err; 614 } 615 if (update_xattr < 0) { 616 if (xattr) 617 __remove_xattr(ci, xattr); 618 kfree(name); 619 kfree(*newxattr); 620 return 0; 621 } 622 } 623 624 if (!xattr) { 625 new = 1; 626 xattr = *newxattr; 627 xattr->name = name; 628 xattr->name_len = name_len; 629 xattr->should_free_name = update_xattr; 630 631 ci->i_xattrs.count++; 632 doutc(cl, "count=%d\n", ci->i_xattrs.count); 633 } else { 634 kfree(*newxattr); 635 *newxattr = NULL; 636 if (xattr->should_free_val) 637 kfree(xattr->val); 638 639 if (update_xattr) { 640 kfree(name); 641 name = xattr->name; 642 } 643 ci->i_xattrs.names_size -= xattr->name_len; 644 ci->i_xattrs.vals_size -= xattr->val_len; 645 } 646 ci->i_xattrs.names_size += name_len; 647 ci->i_xattrs.vals_size += val_len; 648 if (val) 649 xattr->val = val; 650 else 651 xattr->val = ""; 652 653 xattr->val_len = val_len; 654 xattr->dirty = update_xattr; 655 xattr->should_free_val = (val && update_xattr); 656 657 if (new) { 658 rb_link_node(&xattr->node, parent, p); 659 rb_insert_color(&xattr->node, &ci->i_xattrs.index); 660 doutc(cl, "p=%p\n", p); 661 } 662 663 doutc(cl, "added %p %llx.%llx xattr %p %.*s=%.*s%s\n", inode, 664 ceph_vinop(inode), xattr, name_len, name, min(val_len, 665 MAX_XATTR_VAL_PRINT_LEN), val, 666 val_len > MAX_XATTR_VAL_PRINT_LEN ? "..." : ""); 667 668 return 0; 669} 670 671static struct ceph_inode_xattr *__get_xattr(struct ceph_inode_info *ci, 672 const char *name) 673{ 674 struct ceph_client *cl = ceph_inode_to_client(&ci->netfs.inode); 675 struct rb_node **p; 676 struct rb_node *parent = NULL; 677 struct ceph_inode_xattr *xattr = NULL; 678 int name_len = strlen(name); 679 int c; 680 681 p = &ci->i_xattrs.index.rb_node; 682 while (*p) { 683 parent = *p; 684 xattr = rb_entry(parent, struct ceph_inode_xattr, node); 685 c = strncmp(name, xattr->name, xattr->name_len); 686 if (c == 0 && name_len > xattr->name_len) 687 c = 1; 688 if (c < 0) 689 p = &(*p)->rb_left; 690 else if (c > 0) 691 p = &(*p)->rb_right; 692 else { 693 int len = min(xattr->val_len, MAX_XATTR_VAL_PRINT_LEN); 694 695 doutc(cl, "%s found %.*s%s\n", name, len, xattr->val, 696 xattr->val_len > len ? "..." : ""); 697 return xattr; 698 } 699 } 700 701 doutc(cl, "%s not found\n", name); 702 703 return NULL; 704} 705 706static void __free_xattr(struct ceph_inode_xattr *xattr) 707{ 708 BUG_ON(!xattr); 709 710 if (xattr->should_free_name) 711 kfree(xattr->name); 712 if (xattr->should_free_val) 713 kfree(xattr->val); 714 715 kfree(xattr); 716} 717 718static int __remove_xattr(struct ceph_inode_info *ci, 719 struct ceph_inode_xattr *xattr) 720{ 721 if (!xattr) 722 return -ENODATA; 723 724 rb_erase(&xattr->node, &ci->i_xattrs.index); 725 726 if (xattr->should_free_name) 727 kfree(xattr->name); 728 if (xattr->should_free_val) 729 kfree(xattr->val); 730 731 ci->i_xattrs.names_size -= xattr->name_len; 732 ci->i_xattrs.vals_size -= xattr->val_len; 733 ci->i_xattrs.count--; 734 kfree(xattr); 735 736 return 0; 737} 738 739static char *__copy_xattr_names(struct ceph_inode_info *ci, 740 char *dest) 741{ 742 struct ceph_client *cl = ceph_inode_to_client(&ci->netfs.inode); 743 struct rb_node *p; 744 struct ceph_inode_xattr *xattr = NULL; 745 746 p = rb_first(&ci->i_xattrs.index); 747 doutc(cl, "count=%d\n", ci->i_xattrs.count); 748 749 while (p) { 750 xattr = rb_entry(p, struct ceph_inode_xattr, node); 751 memcpy(dest, xattr->name, xattr->name_len); 752 dest[xattr->name_len] = '\0'; 753 754 doutc(cl, "dest=%s %p (%s) (%d/%d)\n", dest, xattr, xattr->name, 755 xattr->name_len, ci->i_xattrs.names_size); 756 757 dest += xattr->name_len + 1; 758 p = rb_next(p); 759 } 760 761 return dest; 762} 763 764void __ceph_destroy_xattrs(struct ceph_inode_info *ci) 765{ 766 struct ceph_client *cl = ceph_inode_to_client(&ci->netfs.inode); 767 struct rb_node *p, *tmp; 768 struct ceph_inode_xattr *xattr = NULL; 769 770 p = rb_first(&ci->i_xattrs.index); 771 772 doutc(cl, "p=%p\n", p); 773 774 while (p) { 775 xattr = rb_entry(p, struct ceph_inode_xattr, node); 776 tmp = p; 777 p = rb_next(tmp); 778 doutc(cl, "next p=%p (%.*s)\n", p, xattr->name_len, xattr->name); 779 rb_erase(tmp, &ci->i_xattrs.index); 780 781 __free_xattr(xattr); 782 } 783 784 ci->i_xattrs.names_size = 0; 785 ci->i_xattrs.vals_size = 0; 786 ci->i_xattrs.index_version = 0; 787 ci->i_xattrs.count = 0; 788 ci->i_xattrs.index = RB_ROOT; 789} 790 791static int __build_xattrs(struct inode *inode) 792 __releases(ci->i_ceph_lock) 793 __acquires(ci->i_ceph_lock) 794{ 795 struct ceph_client *cl = ceph_inode_to_client(inode); 796 u32 namelen; 797 u32 numattr = 0; 798 void *p, *end; 799 u32 len; 800 const char *name, *val; 801 struct ceph_inode_info *ci = ceph_inode(inode); 802 u64 xattr_version; 803 struct ceph_inode_xattr **xattrs = NULL; 804 int err = 0; 805 int i; 806 807 doutc(cl, "len=%d\n", 808 ci->i_xattrs.blob ? (int)ci->i_xattrs.blob->vec.iov_len : 0); 809 810 if (ci->i_xattrs.index_version >= ci->i_xattrs.version) 811 return 0; /* already built */ 812 813 __ceph_destroy_xattrs(ci); 814 815start: 816 /* updated internal xattr rb tree */ 817 if (ci->i_xattrs.blob && ci->i_xattrs.blob->vec.iov_len > 4) { 818 p = ci->i_xattrs.blob->vec.iov_base; 819 end = p + ci->i_xattrs.blob->vec.iov_len; 820 ceph_decode_32_safe(&p, end, numattr, bad); 821 xattr_version = ci->i_xattrs.version; 822 spin_unlock(&ci->i_ceph_lock); 823 824 xattrs = kcalloc(numattr, sizeof(struct ceph_inode_xattr *), 825 GFP_NOFS); 826 err = -ENOMEM; 827 if (!xattrs) 828 goto bad_lock; 829 830 for (i = 0; i < numattr; i++) { 831 xattrs[i] = kmalloc(sizeof(struct ceph_inode_xattr), 832 GFP_NOFS); 833 if (!xattrs[i]) 834 goto bad_lock; 835 } 836 837 spin_lock(&ci->i_ceph_lock); 838 if (ci->i_xattrs.version != xattr_version) { 839 /* lost a race, retry */ 840 for (i = 0; i < numattr; i++) 841 kfree(xattrs[i]); 842 kfree(xattrs); 843 xattrs = NULL; 844 goto start; 845 } 846 err = -EIO; 847 while (numattr--) { 848 ceph_decode_32_safe(&p, end, len, bad); 849 namelen = len; 850 name = p; 851 p += len; 852 ceph_decode_32_safe(&p, end, len, bad); 853 val = p; 854 p += len; 855 856 err = __set_xattr(ci, name, namelen, val, len, 857 0, 0, &xattrs[numattr]); 858 859 if (err < 0) 860 goto bad; 861 } 862 kfree(xattrs); 863 } 864 ci->i_xattrs.index_version = ci->i_xattrs.version; 865 ci->i_xattrs.dirty = false; 866 867 return err; 868bad_lock: 869 spin_lock(&ci->i_ceph_lock); 870bad: 871 if (xattrs) { 872 for (i = 0; i < numattr; i++) 873 kfree(xattrs[i]); 874 kfree(xattrs); 875 } 876 ci->i_xattrs.names_size = 0; 877 return err; 878} 879 880static int __get_required_blob_size(struct ceph_inode_info *ci, int name_size, 881 int val_size) 882{ 883 struct ceph_client *cl = ceph_inode_to_client(&ci->netfs.inode); 884 885 /* 886 * 4 bytes for the length, and additional 4 bytes per each xattr name, 887 * 4 bytes per each value 888 */ 889 int size = 4 + ci->i_xattrs.count*(4 + 4) + 890 ci->i_xattrs.names_size + 891 ci->i_xattrs.vals_size; 892 doutc(cl, "c=%d names.size=%d vals.size=%d\n", ci->i_xattrs.count, 893 ci->i_xattrs.names_size, ci->i_xattrs.vals_size); 894 895 if (name_size) 896 size += 4 + 4 + name_size + val_size; 897 898 return size; 899} 900 901/* 902 * If there are dirty xattrs, reencode xattrs into the prealloc_blob 903 * and swap into place. It returns the old i_xattrs.blob (or NULL) so 904 * that it can be freed by the caller as the i_ceph_lock is likely to be 905 * held. 906 */ 907struct ceph_buffer *__ceph_build_xattrs_blob(struct ceph_inode_info *ci) 908{ 909 struct inode *inode = &ci->netfs.inode; 910 struct ceph_client *cl = ceph_inode_to_client(inode); 911 struct rb_node *p; 912 struct ceph_inode_xattr *xattr = NULL; 913 struct ceph_buffer *old_blob = NULL; 914 void *dest; 915 916 doutc(cl, "%p %llx.%llx\n", inode, ceph_vinop(inode)); 917 if (ci->i_xattrs.dirty) { 918 int need = __get_required_blob_size(ci, 0, 0); 919 920 BUG_ON(need > ci->i_xattrs.prealloc_blob->alloc_len); 921 922 p = rb_first(&ci->i_xattrs.index); 923 dest = ci->i_xattrs.prealloc_blob->vec.iov_base; 924 925 ceph_encode_32(&dest, ci->i_xattrs.count); 926 while (p) { 927 xattr = rb_entry(p, struct ceph_inode_xattr, node); 928 929 ceph_encode_32(&dest, xattr->name_len); 930 memcpy(dest, xattr->name, xattr->name_len); 931 dest += xattr->name_len; 932 ceph_encode_32(&dest, xattr->val_len); 933 memcpy(dest, xattr->val, xattr->val_len); 934 dest += xattr->val_len; 935 936 p = rb_next(p); 937 } 938 939 /* adjust buffer len; it may be larger than we need */ 940 ci->i_xattrs.prealloc_blob->vec.iov_len = 941 dest - ci->i_xattrs.prealloc_blob->vec.iov_base; 942 943 if (ci->i_xattrs.blob) 944 old_blob = ci->i_xattrs.blob; 945 ci->i_xattrs.blob = ci->i_xattrs.prealloc_blob; 946 ci->i_xattrs.prealloc_blob = NULL; 947 ci->i_xattrs.dirty = false; 948 ci->i_xattrs.version++; 949 } 950 951 return old_blob; 952} 953 954static inline int __get_request_mask(struct inode *in) { 955 struct ceph_mds_request *req = current->journal_info; 956 int mask = 0; 957 if (req && req->r_target_inode == in) { 958 if (req->r_op == CEPH_MDS_OP_LOOKUP || 959 req->r_op == CEPH_MDS_OP_LOOKUPINO || 960 req->r_op == CEPH_MDS_OP_LOOKUPPARENT || 961 req->r_op == CEPH_MDS_OP_GETATTR) { 962 mask = le32_to_cpu(req->r_args.getattr.mask); 963 } else if (req->r_op == CEPH_MDS_OP_OPEN || 964 req->r_op == CEPH_MDS_OP_CREATE) { 965 mask = le32_to_cpu(req->r_args.open.mask); 966 } 967 } 968 return mask; 969} 970 971ssize_t __ceph_getxattr(struct inode *inode, const char *name, void *value, 972 size_t size) 973{ 974 struct ceph_client *cl = ceph_inode_to_client(inode); 975 struct ceph_inode_info *ci = ceph_inode(inode); 976 struct ceph_inode_xattr *xattr; 977 struct ceph_vxattr *vxattr; 978 int req_mask; 979 ssize_t err; 980 981 if (strncmp(name, XATTR_CEPH_PREFIX, XATTR_CEPH_PREFIX_LEN)) 982 goto handle_non_vxattrs; 983 984 /* let's see if a virtual xattr was requested */ 985 vxattr = ceph_match_vxattr(inode, name); 986 if (vxattr) { 987 int mask = 0; 988 if (vxattr->flags & VXATTR_FLAG_RSTAT) 989 mask |= CEPH_STAT_RSTAT; 990 if (vxattr->flags & VXATTR_FLAG_DIRSTAT) 991 mask |= CEPH_CAP_FILE_SHARED; 992 err = ceph_do_getattr(inode, mask, true); 993 if (err) 994 return err; 995 err = -ENODATA; 996 if (!(vxattr->exists_cb && !vxattr->exists_cb(ci))) { 997 err = vxattr->getxattr_cb(ci, value, size); 998 if (size && size < err) 999 err = -ERANGE; 1000 } 1001 return err; 1002 } else { 1003 err = ceph_do_getvxattr(inode, name, value, size); 1004 /* this would happen with a new client and old server combo */ 1005 if (err == -EOPNOTSUPP) 1006 err = -ENODATA; 1007 return err; 1008 } 1009handle_non_vxattrs: 1010 req_mask = __get_request_mask(inode); 1011 1012 spin_lock(&ci->i_ceph_lock); 1013 doutc(cl, "%p %llx.%llx name '%s' ver=%lld index_ver=%lld\n", inode, 1014 ceph_vinop(inode), name, ci->i_xattrs.version, 1015 ci->i_xattrs.index_version); 1016 1017 if (ci->i_xattrs.version == 0 || 1018 !((req_mask & CEPH_CAP_XATTR_SHARED) || 1019 __ceph_caps_issued_mask_metric(ci, CEPH_CAP_XATTR_SHARED, 1))) { 1020 spin_unlock(&ci->i_ceph_lock); 1021 1022 /* security module gets xattr while filling trace */ 1023 if (current->journal_info) { 1024 pr_warn_ratelimited_client(cl, 1025 "sync %p %llx.%llx during filling trace\n", 1026 inode, ceph_vinop(inode)); 1027 return -EBUSY; 1028 } 1029 1030 /* get xattrs from mds (if we don't already have them) */ 1031 err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR, true); 1032 if (err) 1033 return err; 1034 spin_lock(&ci->i_ceph_lock); 1035 } 1036 1037 err = __build_xattrs(inode); 1038 if (err < 0) 1039 goto out; 1040 1041 err = -ENODATA; /* == ENOATTR */ 1042 xattr = __get_xattr(ci, name); 1043 if (!xattr) 1044 goto out; 1045 1046 err = -ERANGE; 1047 if (size && size < xattr->val_len) 1048 goto out; 1049 1050 err = xattr->val_len; 1051 if (size == 0) 1052 goto out; 1053 1054 memcpy(value, xattr->val, xattr->val_len); 1055 1056 if (current->journal_info && 1057 !strncmp(name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN) && 1058 security_ismaclabel(name + XATTR_SECURITY_PREFIX_LEN)) 1059 ci->i_ceph_flags |= CEPH_I_SEC_INITED; 1060out: 1061 spin_unlock(&ci->i_ceph_lock); 1062 return err; 1063} 1064 1065ssize_t ceph_listxattr(struct dentry *dentry, char *names, size_t size) 1066{ 1067 struct inode *inode = d_inode(dentry); 1068 struct ceph_client *cl = ceph_inode_to_client(inode); 1069 struct ceph_inode_info *ci = ceph_inode(inode); 1070 bool len_only = (size == 0); 1071 u32 namelen; 1072 int err; 1073 1074 spin_lock(&ci->i_ceph_lock); 1075 doutc(cl, "%p %llx.%llx ver=%lld index_ver=%lld\n", inode, 1076 ceph_vinop(inode), ci->i_xattrs.version, 1077 ci->i_xattrs.index_version); 1078 1079 if (ci->i_xattrs.version == 0 || 1080 !__ceph_caps_issued_mask_metric(ci, CEPH_CAP_XATTR_SHARED, 1)) { 1081 spin_unlock(&ci->i_ceph_lock); 1082 err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR, true); 1083 if (err) 1084 return err; 1085 spin_lock(&ci->i_ceph_lock); 1086 } 1087 1088 err = __build_xattrs(inode); 1089 if (err < 0) 1090 goto out; 1091 1092 /* add 1 byte for each xattr due to the null termination */ 1093 namelen = ci->i_xattrs.names_size + ci->i_xattrs.count; 1094 if (!len_only) { 1095 if (namelen > size) { 1096 err = -ERANGE; 1097 goto out; 1098 } 1099 names = __copy_xattr_names(ci, names); 1100 size -= namelen; 1101 } 1102 err = namelen; 1103out: 1104 spin_unlock(&ci->i_ceph_lock); 1105 return err; 1106} 1107 1108static int ceph_sync_setxattr(struct inode *inode, const char *name, 1109 const char *value, size_t size, int flags) 1110{ 1111 struct ceph_fs_client *fsc = ceph_sb_to_fs_client(inode->i_sb); 1112 struct ceph_client *cl = ceph_inode_to_client(inode); 1113 struct ceph_inode_info *ci = ceph_inode(inode); 1114 struct ceph_mds_request *req; 1115 struct ceph_mds_client *mdsc = fsc->mdsc; 1116 struct ceph_osd_client *osdc = &fsc->client->osdc; 1117 struct ceph_pagelist *pagelist = NULL; 1118 int op = CEPH_MDS_OP_SETXATTR; 1119 int err; 1120 1121 if (size > 0) { 1122 /* copy value into pagelist */ 1123 pagelist = ceph_pagelist_alloc(GFP_NOFS); 1124 if (!pagelist) 1125 return -ENOMEM; 1126 1127 err = ceph_pagelist_append(pagelist, value, size); 1128 if (err) 1129 goto out; 1130 } else if (!value) { 1131 if (flags & CEPH_XATTR_REPLACE) 1132 op = CEPH_MDS_OP_RMXATTR; 1133 else 1134 flags |= CEPH_XATTR_REMOVE; 1135 } 1136 1137 doutc(cl, "name %s value size %zu\n", name, size); 1138 1139 /* do request */ 1140 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); 1141 if (IS_ERR(req)) { 1142 err = PTR_ERR(req); 1143 goto out; 1144 } 1145 1146 req->r_path2 = kstrdup(name, GFP_NOFS); 1147 if (!req->r_path2) { 1148 ceph_mdsc_put_request(req); 1149 err = -ENOMEM; 1150 goto out; 1151 } 1152 1153 if (op == CEPH_MDS_OP_SETXATTR) { 1154 req->r_args.setxattr.flags = cpu_to_le32(flags); 1155 req->r_args.setxattr.osdmap_epoch = 1156 cpu_to_le32(osdc->osdmap->epoch); 1157 req->r_pagelist = pagelist; 1158 pagelist = NULL; 1159 } 1160 1161 req->r_inode = inode; 1162 ihold(inode); 1163 req->r_num_caps = 1; 1164 req->r_inode_drop = CEPH_CAP_XATTR_SHARED; 1165 1166 doutc(cl, "xattr.ver (before): %lld\n", ci->i_xattrs.version); 1167 err = ceph_mdsc_do_request(mdsc, NULL, req); 1168 ceph_mdsc_put_request(req); 1169 doutc(cl, "xattr.ver (after): %lld\n", ci->i_xattrs.version); 1170 1171out: 1172 if (pagelist) 1173 ceph_pagelist_release(pagelist); 1174 return err; 1175} 1176 1177int __ceph_setxattr(struct inode *inode, const char *name, 1178 const void *value, size_t size, int flags) 1179{ 1180 struct ceph_client *cl = ceph_inode_to_client(inode); 1181 struct ceph_vxattr *vxattr; 1182 struct ceph_inode_info *ci = ceph_inode(inode); 1183 struct ceph_mds_client *mdsc = ceph_sb_to_fs_client(inode->i_sb)->mdsc; 1184 struct ceph_cap_flush *prealloc_cf = NULL; 1185 struct ceph_buffer *old_blob = NULL; 1186 int issued; 1187 int err; 1188 int dirty = 0; 1189 int name_len = strlen(name); 1190 int val_len = size; 1191 char *newname = NULL; 1192 char *newval = NULL; 1193 struct ceph_inode_xattr *xattr = NULL; 1194 int required_blob_size; 1195 bool check_realm = false; 1196 bool lock_snap_rwsem = false; 1197 1198 if (ceph_snap(inode) != CEPH_NOSNAP) 1199 return -EROFS; 1200 1201 vxattr = ceph_match_vxattr(inode, name); 1202 if (vxattr) { 1203 if (vxattr->flags & VXATTR_FLAG_READONLY) 1204 return -EOPNOTSUPP; 1205 if (value && !strncmp(vxattr->name, "ceph.quota", 10)) 1206 check_realm = true; 1207 } 1208 1209 /* pass any unhandled ceph.* xattrs through to the MDS */ 1210 if (!strncmp(name, XATTR_CEPH_PREFIX, XATTR_CEPH_PREFIX_LEN)) 1211 goto do_sync_unlocked; 1212 1213 /* preallocate memory for xattr name, value, index node */ 1214 err = -ENOMEM; 1215 newname = kmemdup(name, name_len + 1, GFP_NOFS); 1216 if (!newname) 1217 goto out; 1218 1219 if (val_len) { 1220 newval = kmemdup(value, val_len, GFP_NOFS); 1221 if (!newval) 1222 goto out; 1223 } 1224 1225 xattr = kmalloc(sizeof(struct ceph_inode_xattr), GFP_NOFS); 1226 if (!xattr) 1227 goto out; 1228 1229 prealloc_cf = ceph_alloc_cap_flush(); 1230 if (!prealloc_cf) 1231 goto out; 1232 1233 spin_lock(&ci->i_ceph_lock); 1234retry: 1235 issued = __ceph_caps_issued(ci, NULL); 1236 required_blob_size = __get_required_blob_size(ci, name_len, val_len); 1237 if ((ci->i_xattrs.version == 0) || !(issued & CEPH_CAP_XATTR_EXCL) || 1238 (required_blob_size > mdsc->mdsmap->m_max_xattr_size)) { 1239 doutc(cl, "sync version: %llu size: %d max: %llu\n", 1240 ci->i_xattrs.version, required_blob_size, 1241 mdsc->mdsmap->m_max_xattr_size); 1242 goto do_sync; 1243 } 1244 1245 if (!lock_snap_rwsem && !ci->i_head_snapc) { 1246 lock_snap_rwsem = true; 1247 if (!down_read_trylock(&mdsc->snap_rwsem)) { 1248 spin_unlock(&ci->i_ceph_lock); 1249 down_read(&mdsc->snap_rwsem); 1250 spin_lock(&ci->i_ceph_lock); 1251 goto retry; 1252 } 1253 } 1254 1255 doutc(cl, "%p %llx.%llx name '%s' issued %s\n", inode, 1256 ceph_vinop(inode), name, ceph_cap_string(issued)); 1257 __build_xattrs(inode); 1258 1259 if (!ci->i_xattrs.prealloc_blob || 1260 required_blob_size > ci->i_xattrs.prealloc_blob->alloc_len) { 1261 struct ceph_buffer *blob; 1262 1263 spin_unlock(&ci->i_ceph_lock); 1264 ceph_buffer_put(old_blob); /* Shouldn't be required */ 1265 doutc(cl, " pre-allocating new blob size=%d\n", 1266 required_blob_size); 1267 blob = ceph_buffer_new(required_blob_size, GFP_NOFS); 1268 if (!blob) 1269 goto do_sync_unlocked; 1270 spin_lock(&ci->i_ceph_lock); 1271 /* prealloc_blob can't be released while holding i_ceph_lock */ 1272 if (ci->i_xattrs.prealloc_blob) 1273 old_blob = ci->i_xattrs.prealloc_blob; 1274 ci->i_xattrs.prealloc_blob = blob; 1275 goto retry; 1276 } 1277 1278 err = __set_xattr(ci, newname, name_len, newval, val_len, 1279 flags, value ? 1 : -1, &xattr); 1280 1281 if (!err) { 1282 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_XATTR_EXCL, 1283 &prealloc_cf); 1284 ci->i_xattrs.dirty = true; 1285 inode_set_ctime_current(inode); 1286 } 1287 1288 spin_unlock(&ci->i_ceph_lock); 1289 ceph_buffer_put(old_blob); 1290 if (lock_snap_rwsem) 1291 up_read(&mdsc->snap_rwsem); 1292 if (dirty) 1293 __mark_inode_dirty(inode, dirty); 1294 ceph_free_cap_flush(prealloc_cf); 1295 return err; 1296 1297do_sync: 1298 spin_unlock(&ci->i_ceph_lock); 1299do_sync_unlocked: 1300 if (lock_snap_rwsem) 1301 up_read(&mdsc->snap_rwsem); 1302 1303 /* security module set xattr while filling trace */ 1304 if (current->journal_info) { 1305 pr_warn_ratelimited_client(cl, 1306 "sync %p %llx.%llx during filling trace\n", 1307 inode, ceph_vinop(inode)); 1308 err = -EBUSY; 1309 } else { 1310 err = ceph_sync_setxattr(inode, name, value, size, flags); 1311 if (err >= 0 && check_realm) { 1312 /* check if snaprealm was created for quota inode */ 1313 spin_lock(&ci->i_ceph_lock); 1314 if ((ci->i_max_files || ci->i_max_bytes) && 1315 !(ci->i_snap_realm && 1316 ci->i_snap_realm->ino == ci->i_vino.ino)) 1317 err = -EOPNOTSUPP; 1318 spin_unlock(&ci->i_ceph_lock); 1319 } 1320 } 1321out: 1322 ceph_free_cap_flush(prealloc_cf); 1323 kfree(newname); 1324 kfree(newval); 1325 kfree(xattr); 1326 return err; 1327} 1328 1329static int ceph_get_xattr_handler(const struct xattr_handler *handler, 1330 struct dentry *dentry, struct inode *inode, 1331 const char *name, void *value, size_t size) 1332{ 1333 if (!ceph_is_valid_xattr(name)) 1334 return -EOPNOTSUPP; 1335 return __ceph_getxattr(inode, name, value, size); 1336} 1337 1338static int ceph_set_xattr_handler(const struct xattr_handler *handler, 1339 struct mnt_idmap *idmap, 1340 struct dentry *unused, struct inode *inode, 1341 const char *name, const void *value, 1342 size_t size, int flags) 1343{ 1344 if (!ceph_is_valid_xattr(name)) 1345 return -EOPNOTSUPP; 1346 return __ceph_setxattr(inode, name, value, size, flags); 1347} 1348 1349static const struct xattr_handler ceph_other_xattr_handler = { 1350 .prefix = "", /* match any name => handlers called with full name */ 1351 .get = ceph_get_xattr_handler, 1352 .set = ceph_set_xattr_handler, 1353}; 1354 1355#ifdef CONFIG_SECURITY 1356bool ceph_security_xattr_wanted(struct inode *in) 1357{ 1358 return in->i_security != NULL; 1359} 1360 1361bool ceph_security_xattr_deadlock(struct inode *in) 1362{ 1363 struct ceph_inode_info *ci; 1364 bool ret; 1365 if (!in->i_security) 1366 return false; 1367 ci = ceph_inode(in); 1368 spin_lock(&ci->i_ceph_lock); 1369 ret = !(ci->i_ceph_flags & CEPH_I_SEC_INITED) && 1370 !(ci->i_xattrs.version > 0 && 1371 __ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 0)); 1372 spin_unlock(&ci->i_ceph_lock); 1373 return ret; 1374} 1375 1376#ifdef CONFIG_CEPH_FS_SECURITY_LABEL 1377int ceph_security_init_secctx(struct dentry *dentry, umode_t mode, 1378 struct ceph_acl_sec_ctx *as_ctx) 1379{ 1380 struct ceph_pagelist *pagelist = as_ctx->pagelist; 1381 const char *name; 1382 size_t name_len; 1383 int err; 1384 1385 err = security_dentry_init_security(dentry, mode, &dentry->d_name, 1386 &name, &as_ctx->sec_ctx, 1387 &as_ctx->sec_ctxlen); 1388 if (err < 0) { 1389 WARN_ON_ONCE(err != -EOPNOTSUPP); 1390 err = 0; /* do nothing */ 1391 goto out; 1392 } 1393 1394 err = -ENOMEM; 1395 if (!pagelist) { 1396 pagelist = ceph_pagelist_alloc(GFP_KERNEL); 1397 if (!pagelist) 1398 goto out; 1399 err = ceph_pagelist_reserve(pagelist, PAGE_SIZE); 1400 if (err) 1401 goto out; 1402 ceph_pagelist_encode_32(pagelist, 1); 1403 } 1404 1405 /* 1406 * FIXME: Make security_dentry_init_security() generic. Currently 1407 * It only supports single security module and only selinux has 1408 * dentry_init_security hook. 1409 */ 1410 name_len = strlen(name); 1411 err = ceph_pagelist_reserve(pagelist, 1412 4 * 2 + name_len + as_ctx->sec_ctxlen); 1413 if (err) 1414 goto out; 1415 1416 if (as_ctx->pagelist) { 1417 /* update count of KV pairs */ 1418 BUG_ON(pagelist->length <= sizeof(__le32)); 1419 if (list_is_singular(&pagelist->head)) { 1420 le32_add_cpu((__le32*)pagelist->mapped_tail, 1); 1421 } else { 1422 struct page *page = list_first_entry(&pagelist->head, 1423 struct page, lru); 1424 void *addr = kmap_atomic(page); 1425 le32_add_cpu((__le32*)addr, 1); 1426 kunmap_atomic(addr); 1427 } 1428 } else { 1429 as_ctx->pagelist = pagelist; 1430 } 1431 1432 ceph_pagelist_encode_32(pagelist, name_len); 1433 ceph_pagelist_append(pagelist, name, name_len); 1434 1435 ceph_pagelist_encode_32(pagelist, as_ctx->sec_ctxlen); 1436 ceph_pagelist_append(pagelist, as_ctx->sec_ctx, as_ctx->sec_ctxlen); 1437 1438 err = 0; 1439out: 1440 if (pagelist && !as_ctx->pagelist) 1441 ceph_pagelist_release(pagelist); 1442 return err; 1443} 1444#endif /* CONFIG_CEPH_FS_SECURITY_LABEL */ 1445#endif /* CONFIG_SECURITY */ 1446 1447void ceph_release_acl_sec_ctx(struct ceph_acl_sec_ctx *as_ctx) 1448{ 1449#ifdef CONFIG_CEPH_FS_POSIX_ACL 1450 posix_acl_release(as_ctx->acl); 1451 posix_acl_release(as_ctx->default_acl); 1452#endif 1453#ifdef CONFIG_CEPH_FS_SECURITY_LABEL 1454 security_release_secctx(as_ctx->sec_ctx, as_ctx->sec_ctxlen); 1455#endif 1456#ifdef CONFIG_FS_ENCRYPTION 1457 kfree(as_ctx->fscrypt_auth); 1458#endif 1459 if (as_ctx->pagelist) 1460 ceph_pagelist_release(as_ctx->pagelist); 1461} 1462 1463/* 1464 * List of handlers for synthetic system.* attributes. Other 1465 * attributes are handled directly. 1466 */ 1467const struct xattr_handler * const ceph_xattr_handlers[] = { 1468 &ceph_other_xattr_handler, 1469 NULL, 1470}; 1471