1 #include <linux/ceph/ceph_debug.h> 2 3 #include "super.h" 4 #include "mds_client.h" 5 6 #include <linux/ceph/decode.h> 7 8 #include <linux/xattr.h> 9 #include <linux/slab.h> 10 11 #define XATTR_CEPH_PREFIX "ceph." 12 #define XATTR_CEPH_PREFIX_LEN (sizeof (XATTR_CEPH_PREFIX) - 1) 13 14 static bool ceph_is_valid_xattr(const char *name) 15 { 16 return !strncmp(name, XATTR_CEPH_PREFIX, XATTR_CEPH_PREFIX_LEN) || 17 !strncmp(name, XATTR_SECURITY_PREFIX, 18 XATTR_SECURITY_PREFIX_LEN) || 19 !strncmp(name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN) || 20 !strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN); 21 } 22 23 /* 24 * These define virtual xattrs exposing the recursive directory 25 * statistics and layout metadata. 26 */ 27 struct ceph_vxattr { 28 char *name; 29 size_t name_size; /* strlen(name) + 1 (for '\0') */ 30 size_t (*getxattr_cb)(struct ceph_inode_info *ci, char *val, 31 size_t size); 32 bool readonly; 33 }; 34 35 /* directories */ 36 37 static size_t ceph_vxattrcb_dir_entries(struct ceph_inode_info *ci, char *val, 38 size_t size) 39 { 40 return snprintf(val, size, "%lld", ci->i_files + ci->i_subdirs); 41 } 42 43 static size_t ceph_vxattrcb_dir_files(struct ceph_inode_info *ci, char *val, 44 size_t size) 45 { 46 return snprintf(val, size, "%lld", ci->i_files); 47 } 48 49 static size_t ceph_vxattrcb_dir_subdirs(struct ceph_inode_info *ci, char *val, 50 size_t size) 51 { 52 return snprintf(val, size, "%lld", ci->i_subdirs); 53 } 54 55 static size_t ceph_vxattrcb_dir_rentries(struct ceph_inode_info *ci, char *val, 56 size_t size) 57 { 58 return snprintf(val, size, "%lld", ci->i_rfiles + ci->i_rsubdirs); 59 } 60 61 static size_t ceph_vxattrcb_dir_rfiles(struct ceph_inode_info *ci, char *val, 62 size_t size) 63 { 64 return snprintf(val, size, "%lld", ci->i_rfiles); 65 } 66 67 static size_t ceph_vxattrcb_dir_rsubdirs(struct ceph_inode_info *ci, char *val, 68 size_t size) 69 { 70 return snprintf(val, size, "%lld", ci->i_rsubdirs); 71 } 72 73 static size_t ceph_vxattrcb_dir_rbytes(struct ceph_inode_info *ci, char *val, 74 size_t size) 75 { 76 return snprintf(val, size, "%lld", ci->i_rbytes); 77 } 78 79 static size_t ceph_vxattrcb_dir_rctime(struct ceph_inode_info *ci, char *val, 80 size_t size) 81 { 82 return snprintf(val, size, "%ld.09%ld", (long)ci->i_rctime.tv_sec, 83 (long)ci->i_rctime.tv_nsec); 84 } 85 86 #define CEPH_XATTR_NAME(_type, _name) XATTR_CEPH_PREFIX #_type "." #_name 87 88 #define XATTR_NAME_CEPH(_type, _name) \ 89 { \ 90 .name = CEPH_XATTR_NAME(_type, _name), \ 91 .name_size = sizeof (CEPH_XATTR_NAME(_type, _name)), \ 92 .getxattr_cb = ceph_vxattrcb_ ## _type ## _ ## _name, \ 93 .readonly = true, \ 94 } 95 96 static struct ceph_vxattr ceph_dir_vxattrs[] = { 97 XATTR_NAME_CEPH(dir, entries), 98 XATTR_NAME_CEPH(dir, files), 99 XATTR_NAME_CEPH(dir, subdirs), 100 XATTR_NAME_CEPH(dir, rentries), 101 XATTR_NAME_CEPH(dir, rfiles), 102 XATTR_NAME_CEPH(dir, rsubdirs), 103 XATTR_NAME_CEPH(dir, rbytes), 104 XATTR_NAME_CEPH(dir, rctime), 105 { 0 } /* Required table terminator */ 106 }; 107 static size_t ceph_dir_vxattrs_name_size; /* total size of all names */ 108 109 /* files */ 110 111 static size_t ceph_vxattrcb_file_layout(struct ceph_inode_info *ci, char *val, 112 size_t size) 113 { 114 int ret; 115 116 ret = snprintf(val, size, 117 "chunk_bytes=%lld\nstripe_count=%lld\nobject_size=%lld\n", 118 (unsigned long long)ceph_file_layout_su(ci->i_layout), 119 (unsigned long long)ceph_file_layout_stripe_count(ci->i_layout), 120 (unsigned long long)ceph_file_layout_object_size(ci->i_layout)); 121 return ret; 122 } 123 124 static struct ceph_vxattr ceph_file_vxattrs[] = { 125 XATTR_NAME_CEPH(file, layout), 126 /* The following extended attribute name is deprecated */ 127 { 128 .name = XATTR_CEPH_PREFIX "layout", 129 .name_size = sizeof (XATTR_CEPH_PREFIX "layout"), 130 .getxattr_cb = ceph_vxattrcb_file_layout, 131 .readonly = true, 132 }, 133 { 0 } /* Required table terminator */ 134 }; 135 static size_t ceph_file_vxattrs_name_size; /* total size of all names */ 136 137 static struct ceph_vxattr *ceph_inode_vxattrs(struct inode *inode) 138 { 139 if (S_ISDIR(inode->i_mode)) 140 return ceph_dir_vxattrs; 141 else if (S_ISREG(inode->i_mode)) 142 return ceph_file_vxattrs; 143 return NULL; 144 } 145 146 static size_t ceph_vxattrs_name_size(struct ceph_vxattr *vxattrs) 147 { 148 if (vxattrs == ceph_dir_vxattrs) 149 return ceph_dir_vxattrs_name_size; 150 if (vxattrs == ceph_file_vxattrs) 151 return ceph_file_vxattrs_name_size; 152 BUG(); 153 154 return 0; 155 } 156 157 /* 158 * Compute the aggregate size (including terminating '\0') of all 159 * virtual extended attribute names in the given vxattr table. 160 */ 161 static size_t __init vxattrs_name_size(struct ceph_vxattr *vxattrs) 162 { 163 struct ceph_vxattr *vxattr; 164 size_t size = 0; 165 166 for (vxattr = vxattrs; vxattr->name; vxattr++) 167 size += vxattr->name_size; 168 169 return size; 170 } 171 172 /* Routines called at initialization and exit time */ 173 174 void __init ceph_xattr_init(void) 175 { 176 ceph_dir_vxattrs_name_size = vxattrs_name_size(ceph_dir_vxattrs); 177 ceph_file_vxattrs_name_size = vxattrs_name_size(ceph_file_vxattrs); 178 } 179 180 void ceph_xattr_exit(void) 181 { 182 ceph_dir_vxattrs_name_size = 0; 183 ceph_file_vxattrs_name_size = 0; 184 } 185 186 static struct ceph_vxattr *ceph_match_vxattr(struct inode *inode, 187 const char *name) 188 { 189 struct ceph_vxattr *vxattr = ceph_inode_vxattrs(inode); 190 191 if (vxattr) { 192 while (vxattr->name) { 193 if (!strcmp(vxattr->name, name)) 194 return vxattr; 195 vxattr++; 196 } 197 } 198 199 return NULL; 200 } 201 202 static int __set_xattr(struct ceph_inode_info *ci, 203 const char *name, int name_len, 204 const char *val, int val_len, 205 int dirty, 206 int should_free_name, int should_free_val, 207 struct ceph_inode_xattr **newxattr) 208 { 209 struct rb_node **p; 210 struct rb_node *parent = NULL; 211 struct ceph_inode_xattr *xattr = NULL; 212 int c; 213 int new = 0; 214 215 p = &ci->i_xattrs.index.rb_node; 216 while (*p) { 217 parent = *p; 218 xattr = rb_entry(parent, struct ceph_inode_xattr, node); 219 c = strncmp(name, xattr->name, min(name_len, xattr->name_len)); 220 if (c < 0) 221 p = &(*p)->rb_left; 222 else if (c > 0) 223 p = &(*p)->rb_right; 224 else { 225 if (name_len == xattr->name_len) 226 break; 227 else if (name_len < xattr->name_len) 228 p = &(*p)->rb_left; 229 else 230 p = &(*p)->rb_right; 231 } 232 xattr = NULL; 233 } 234 235 if (!xattr) { 236 new = 1; 237 xattr = *newxattr; 238 xattr->name = name; 239 xattr->name_len = name_len; 240 xattr->should_free_name = should_free_name; 241 242 ci->i_xattrs.count++; 243 dout("__set_xattr count=%d\n", ci->i_xattrs.count); 244 } else { 245 kfree(*newxattr); 246 *newxattr = NULL; 247 if (xattr->should_free_val) 248 kfree((void *)xattr->val); 249 250 if (should_free_name) { 251 kfree((void *)name); 252 name = xattr->name; 253 } 254 ci->i_xattrs.names_size -= xattr->name_len; 255 ci->i_xattrs.vals_size -= xattr->val_len; 256 } 257 ci->i_xattrs.names_size += name_len; 258 ci->i_xattrs.vals_size += val_len; 259 if (val) 260 xattr->val = val; 261 else 262 xattr->val = ""; 263 264 xattr->val_len = val_len; 265 xattr->dirty = dirty; 266 xattr->should_free_val = (val && should_free_val); 267 268 if (new) { 269 rb_link_node(&xattr->node, parent, p); 270 rb_insert_color(&xattr->node, &ci->i_xattrs.index); 271 dout("__set_xattr_val p=%p\n", p); 272 } 273 274 dout("__set_xattr_val added %llx.%llx xattr %p %s=%.*s\n", 275 ceph_vinop(&ci->vfs_inode), xattr, name, val_len, val); 276 277 return 0; 278 } 279 280 static struct ceph_inode_xattr *__get_xattr(struct ceph_inode_info *ci, 281 const char *name) 282 { 283 struct rb_node **p; 284 struct rb_node *parent = NULL; 285 struct ceph_inode_xattr *xattr = NULL; 286 int name_len = strlen(name); 287 int c; 288 289 p = &ci->i_xattrs.index.rb_node; 290 while (*p) { 291 parent = *p; 292 xattr = rb_entry(parent, struct ceph_inode_xattr, node); 293 c = strncmp(name, xattr->name, xattr->name_len); 294 if (c == 0 && name_len > xattr->name_len) 295 c = 1; 296 if (c < 0) 297 p = &(*p)->rb_left; 298 else if (c > 0) 299 p = &(*p)->rb_right; 300 else { 301 dout("__get_xattr %s: found %.*s\n", name, 302 xattr->val_len, xattr->val); 303 return xattr; 304 } 305 } 306 307 dout("__get_xattr %s: not found\n", name); 308 309 return NULL; 310 } 311 312 static void __free_xattr(struct ceph_inode_xattr *xattr) 313 { 314 BUG_ON(!xattr); 315 316 if (xattr->should_free_name) 317 kfree((void *)xattr->name); 318 if (xattr->should_free_val) 319 kfree((void *)xattr->val); 320 321 kfree(xattr); 322 } 323 324 static int __remove_xattr(struct ceph_inode_info *ci, 325 struct ceph_inode_xattr *xattr) 326 { 327 if (!xattr) 328 return -EOPNOTSUPP; 329 330 rb_erase(&xattr->node, &ci->i_xattrs.index); 331 332 if (xattr->should_free_name) 333 kfree((void *)xattr->name); 334 if (xattr->should_free_val) 335 kfree((void *)xattr->val); 336 337 ci->i_xattrs.names_size -= xattr->name_len; 338 ci->i_xattrs.vals_size -= xattr->val_len; 339 ci->i_xattrs.count--; 340 kfree(xattr); 341 342 return 0; 343 } 344 345 static int __remove_xattr_by_name(struct ceph_inode_info *ci, 346 const char *name) 347 { 348 struct rb_node **p; 349 struct ceph_inode_xattr *xattr; 350 int err; 351 352 p = &ci->i_xattrs.index.rb_node; 353 xattr = __get_xattr(ci, name); 354 err = __remove_xattr(ci, xattr); 355 return err; 356 } 357 358 static char *__copy_xattr_names(struct ceph_inode_info *ci, 359 char *dest) 360 { 361 struct rb_node *p; 362 struct ceph_inode_xattr *xattr = NULL; 363 364 p = rb_first(&ci->i_xattrs.index); 365 dout("__copy_xattr_names count=%d\n", ci->i_xattrs.count); 366 367 while (p) { 368 xattr = rb_entry(p, struct ceph_inode_xattr, node); 369 memcpy(dest, xattr->name, xattr->name_len); 370 dest[xattr->name_len] = '\0'; 371 372 dout("dest=%s %p (%s) (%d/%d)\n", dest, xattr, xattr->name, 373 xattr->name_len, ci->i_xattrs.names_size); 374 375 dest += xattr->name_len + 1; 376 p = rb_next(p); 377 } 378 379 return dest; 380 } 381 382 void __ceph_destroy_xattrs(struct ceph_inode_info *ci) 383 { 384 struct rb_node *p, *tmp; 385 struct ceph_inode_xattr *xattr = NULL; 386 387 p = rb_first(&ci->i_xattrs.index); 388 389 dout("__ceph_destroy_xattrs p=%p\n", p); 390 391 while (p) { 392 xattr = rb_entry(p, struct ceph_inode_xattr, node); 393 tmp = p; 394 p = rb_next(tmp); 395 dout("__ceph_destroy_xattrs next p=%p (%.*s)\n", p, 396 xattr->name_len, xattr->name); 397 rb_erase(tmp, &ci->i_xattrs.index); 398 399 __free_xattr(xattr); 400 } 401 402 ci->i_xattrs.names_size = 0; 403 ci->i_xattrs.vals_size = 0; 404 ci->i_xattrs.index_version = 0; 405 ci->i_xattrs.count = 0; 406 ci->i_xattrs.index = RB_ROOT; 407 } 408 409 static int __build_xattrs(struct inode *inode) 410 __releases(ci->i_ceph_lock) 411 __acquires(ci->i_ceph_lock) 412 { 413 u32 namelen; 414 u32 numattr = 0; 415 void *p, *end; 416 u32 len; 417 const char *name, *val; 418 struct ceph_inode_info *ci = ceph_inode(inode); 419 int xattr_version; 420 struct ceph_inode_xattr **xattrs = NULL; 421 int err = 0; 422 int i; 423 424 dout("__build_xattrs() len=%d\n", 425 ci->i_xattrs.blob ? (int)ci->i_xattrs.blob->vec.iov_len : 0); 426 427 if (ci->i_xattrs.index_version >= ci->i_xattrs.version) 428 return 0; /* already built */ 429 430 __ceph_destroy_xattrs(ci); 431 432 start: 433 /* updated internal xattr rb tree */ 434 if (ci->i_xattrs.blob && ci->i_xattrs.blob->vec.iov_len > 4) { 435 p = ci->i_xattrs.blob->vec.iov_base; 436 end = p + ci->i_xattrs.blob->vec.iov_len; 437 ceph_decode_32_safe(&p, end, numattr, bad); 438 xattr_version = ci->i_xattrs.version; 439 spin_unlock(&ci->i_ceph_lock); 440 441 xattrs = kcalloc(numattr, sizeof(struct ceph_xattr *), 442 GFP_NOFS); 443 err = -ENOMEM; 444 if (!xattrs) 445 goto bad_lock; 446 memset(xattrs, 0, numattr*sizeof(struct ceph_xattr *)); 447 for (i = 0; i < numattr; i++) { 448 xattrs[i] = kmalloc(sizeof(struct ceph_inode_xattr), 449 GFP_NOFS); 450 if (!xattrs[i]) 451 goto bad_lock; 452 } 453 454 spin_lock(&ci->i_ceph_lock); 455 if (ci->i_xattrs.version != xattr_version) { 456 /* lost a race, retry */ 457 for (i = 0; i < numattr; i++) 458 kfree(xattrs[i]); 459 kfree(xattrs); 460 goto start; 461 } 462 err = -EIO; 463 while (numattr--) { 464 ceph_decode_32_safe(&p, end, len, bad); 465 namelen = len; 466 name = p; 467 p += len; 468 ceph_decode_32_safe(&p, end, len, bad); 469 val = p; 470 p += len; 471 472 err = __set_xattr(ci, name, namelen, val, len, 473 0, 0, 0, &xattrs[numattr]); 474 475 if (err < 0) 476 goto bad; 477 } 478 kfree(xattrs); 479 } 480 ci->i_xattrs.index_version = ci->i_xattrs.version; 481 ci->i_xattrs.dirty = false; 482 483 return err; 484 bad_lock: 485 spin_lock(&ci->i_ceph_lock); 486 bad: 487 if (xattrs) { 488 for (i = 0; i < numattr; i++) 489 kfree(xattrs[i]); 490 kfree(xattrs); 491 } 492 ci->i_xattrs.names_size = 0; 493 return err; 494 } 495 496 static int __get_required_blob_size(struct ceph_inode_info *ci, int name_size, 497 int val_size) 498 { 499 /* 500 * 4 bytes for the length, and additional 4 bytes per each xattr name, 501 * 4 bytes per each value 502 */ 503 int size = 4 + ci->i_xattrs.count*(4 + 4) + 504 ci->i_xattrs.names_size + 505 ci->i_xattrs.vals_size; 506 dout("__get_required_blob_size c=%d names.size=%d vals.size=%d\n", 507 ci->i_xattrs.count, ci->i_xattrs.names_size, 508 ci->i_xattrs.vals_size); 509 510 if (name_size) 511 size += 4 + 4 + name_size + val_size; 512 513 return size; 514 } 515 516 /* 517 * If there are dirty xattrs, reencode xattrs into the prealloc_blob 518 * and swap into place. 519 */ 520 void __ceph_build_xattrs_blob(struct ceph_inode_info *ci) 521 { 522 struct rb_node *p; 523 struct ceph_inode_xattr *xattr = NULL; 524 void *dest; 525 526 dout("__build_xattrs_blob %p\n", &ci->vfs_inode); 527 if (ci->i_xattrs.dirty) { 528 int need = __get_required_blob_size(ci, 0, 0); 529 530 BUG_ON(need > ci->i_xattrs.prealloc_blob->alloc_len); 531 532 p = rb_first(&ci->i_xattrs.index); 533 dest = ci->i_xattrs.prealloc_blob->vec.iov_base; 534 535 ceph_encode_32(&dest, ci->i_xattrs.count); 536 while (p) { 537 xattr = rb_entry(p, struct ceph_inode_xattr, node); 538 539 ceph_encode_32(&dest, xattr->name_len); 540 memcpy(dest, xattr->name, xattr->name_len); 541 dest += xattr->name_len; 542 ceph_encode_32(&dest, xattr->val_len); 543 memcpy(dest, xattr->val, xattr->val_len); 544 dest += xattr->val_len; 545 546 p = rb_next(p); 547 } 548 549 /* adjust buffer len; it may be larger than we need */ 550 ci->i_xattrs.prealloc_blob->vec.iov_len = 551 dest - ci->i_xattrs.prealloc_blob->vec.iov_base; 552 553 if (ci->i_xattrs.blob) 554 ceph_buffer_put(ci->i_xattrs.blob); 555 ci->i_xattrs.blob = ci->i_xattrs.prealloc_blob; 556 ci->i_xattrs.prealloc_blob = NULL; 557 ci->i_xattrs.dirty = false; 558 ci->i_xattrs.version++; 559 } 560 } 561 562 ssize_t ceph_getxattr(struct dentry *dentry, const char *name, void *value, 563 size_t size) 564 { 565 struct inode *inode = dentry->d_inode; 566 struct ceph_inode_info *ci = ceph_inode(inode); 567 int err; 568 struct ceph_inode_xattr *xattr; 569 struct ceph_vxattr *vxattr = NULL; 570 571 if (!ceph_is_valid_xattr(name)) 572 return -ENODATA; 573 574 /* let's see if a virtual xattr was requested */ 575 vxattr = ceph_match_vxattr(inode, name); 576 577 spin_lock(&ci->i_ceph_lock); 578 dout("getxattr %p ver=%lld index_ver=%lld\n", inode, 579 ci->i_xattrs.version, ci->i_xattrs.index_version); 580 581 if (__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 1) && 582 (ci->i_xattrs.index_version >= ci->i_xattrs.version)) { 583 goto get_xattr; 584 } else { 585 spin_unlock(&ci->i_ceph_lock); 586 /* get xattrs from mds (if we don't already have them) */ 587 err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR); 588 if (err) 589 return err; 590 } 591 592 spin_lock(&ci->i_ceph_lock); 593 594 if (vxattr && vxattr->readonly) { 595 err = vxattr->getxattr_cb(ci, value, size); 596 goto out; 597 } 598 599 err = __build_xattrs(inode); 600 if (err < 0) 601 goto out; 602 603 get_xattr: 604 err = -ENODATA; /* == ENOATTR */ 605 xattr = __get_xattr(ci, name); 606 if (!xattr) { 607 if (vxattr) 608 err = vxattr->getxattr_cb(ci, value, size); 609 goto out; 610 } 611 612 err = -ERANGE; 613 if (size && size < xattr->val_len) 614 goto out; 615 616 err = xattr->val_len; 617 if (size == 0) 618 goto out; 619 620 memcpy(value, xattr->val, xattr->val_len); 621 622 out: 623 spin_unlock(&ci->i_ceph_lock); 624 return err; 625 } 626 627 ssize_t ceph_listxattr(struct dentry *dentry, char *names, size_t size) 628 { 629 struct inode *inode = dentry->d_inode; 630 struct ceph_inode_info *ci = ceph_inode(inode); 631 struct ceph_vxattr *vxattrs = ceph_inode_vxattrs(inode); 632 u32 vir_namelen = 0; 633 u32 namelen; 634 int err; 635 u32 len; 636 int i; 637 638 spin_lock(&ci->i_ceph_lock); 639 dout("listxattr %p ver=%lld index_ver=%lld\n", inode, 640 ci->i_xattrs.version, ci->i_xattrs.index_version); 641 642 if (__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 1) && 643 (ci->i_xattrs.index_version >= ci->i_xattrs.version)) { 644 goto list_xattr; 645 } else { 646 spin_unlock(&ci->i_ceph_lock); 647 err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR); 648 if (err) 649 return err; 650 } 651 652 spin_lock(&ci->i_ceph_lock); 653 654 err = __build_xattrs(inode); 655 if (err < 0) 656 goto out; 657 658 list_xattr: 659 /* 660 * Start with virtual dir xattr names (if any) (including 661 * terminating '\0' characters for each). 662 */ 663 vir_namelen = ceph_vxattrs_name_size(vxattrs); 664 665 /* adding 1 byte per each variable due to the null termination */ 666 namelen = vir_namelen + ci->i_xattrs.names_size + ci->i_xattrs.count; 667 err = -ERANGE; 668 if (size && namelen > size) 669 goto out; 670 671 err = namelen; 672 if (size == 0) 673 goto out; 674 675 names = __copy_xattr_names(ci, names); 676 677 /* virtual xattr names, too */ 678 if (vxattrs) 679 for (i = 0; vxattrs[i].name; i++) { 680 len = sprintf(names, "%s", vxattrs[i].name); 681 names += len + 1; 682 } 683 684 out: 685 spin_unlock(&ci->i_ceph_lock); 686 return err; 687 } 688 689 static int ceph_sync_setxattr(struct dentry *dentry, const char *name, 690 const char *value, size_t size, int flags) 691 { 692 struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb); 693 struct inode *inode = dentry->d_inode; 694 struct ceph_inode_info *ci = ceph_inode(inode); 695 struct inode *parent_inode; 696 struct ceph_mds_request *req; 697 struct ceph_mds_client *mdsc = fsc->mdsc; 698 int err; 699 int i, nr_pages; 700 struct page **pages = NULL; 701 void *kaddr; 702 703 /* copy value into some pages */ 704 nr_pages = calc_pages_for(0, size); 705 if (nr_pages) { 706 pages = kmalloc(sizeof(pages[0])*nr_pages, GFP_NOFS); 707 if (!pages) 708 return -ENOMEM; 709 err = -ENOMEM; 710 for (i = 0; i < nr_pages; i++) { 711 pages[i] = __page_cache_alloc(GFP_NOFS); 712 if (!pages[i]) { 713 nr_pages = i; 714 goto out; 715 } 716 kaddr = kmap(pages[i]); 717 memcpy(kaddr, value + i*PAGE_CACHE_SIZE, 718 min(PAGE_CACHE_SIZE, size-i*PAGE_CACHE_SIZE)); 719 } 720 } 721 722 dout("setxattr value=%.*s\n", (int)size, value); 723 724 /* do request */ 725 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETXATTR, 726 USE_AUTH_MDS); 727 if (IS_ERR(req)) { 728 err = PTR_ERR(req); 729 goto out; 730 } 731 req->r_inode = inode; 732 ihold(inode); 733 req->r_inode_drop = CEPH_CAP_XATTR_SHARED; 734 req->r_num_caps = 1; 735 req->r_args.setxattr.flags = cpu_to_le32(flags); 736 req->r_path2 = kstrdup(name, GFP_NOFS); 737 738 req->r_pages = pages; 739 req->r_num_pages = nr_pages; 740 req->r_data_len = size; 741 742 dout("xattr.ver (before): %lld\n", ci->i_xattrs.version); 743 parent_inode = ceph_get_dentry_parent_inode(dentry); 744 err = ceph_mdsc_do_request(mdsc, parent_inode, req); 745 iput(parent_inode); 746 ceph_mdsc_put_request(req); 747 dout("xattr.ver (after): %lld\n", ci->i_xattrs.version); 748 749 out: 750 if (pages) { 751 for (i = 0; i < nr_pages; i++) 752 __free_page(pages[i]); 753 kfree(pages); 754 } 755 return err; 756 } 757 758 int ceph_setxattr(struct dentry *dentry, const char *name, 759 const void *value, size_t size, int flags) 760 { 761 struct inode *inode = dentry->d_inode; 762 struct ceph_vxattr *vxattr; 763 struct ceph_inode_info *ci = ceph_inode(inode); 764 int issued; 765 int err; 766 int dirty; 767 int name_len = strlen(name); 768 int val_len = size; 769 char *newname = NULL; 770 char *newval = NULL; 771 struct ceph_inode_xattr *xattr = NULL; 772 int required_blob_size; 773 774 if (ceph_snap(inode) != CEPH_NOSNAP) 775 return -EROFS; 776 777 if (!ceph_is_valid_xattr(name)) 778 return -EOPNOTSUPP; 779 780 vxattr = ceph_match_vxattr(inode, name); 781 if (vxattr && vxattr->readonly) 782 return -EOPNOTSUPP; 783 784 /* preallocate memory for xattr name, value, index node */ 785 err = -ENOMEM; 786 newname = kmemdup(name, name_len + 1, GFP_NOFS); 787 if (!newname) 788 goto out; 789 790 if (val_len) { 791 newval = kmemdup(value, val_len, GFP_NOFS); 792 if (!newval) 793 goto out; 794 } 795 796 xattr = kmalloc(sizeof(struct ceph_inode_xattr), GFP_NOFS); 797 if (!xattr) 798 goto out; 799 800 spin_lock(&ci->i_ceph_lock); 801 retry: 802 issued = __ceph_caps_issued(ci, NULL); 803 dout("setxattr %p issued %s\n", inode, ceph_cap_string(issued)); 804 if (!(issued & CEPH_CAP_XATTR_EXCL)) 805 goto do_sync; 806 __build_xattrs(inode); 807 808 required_blob_size = __get_required_blob_size(ci, name_len, val_len); 809 810 if (!ci->i_xattrs.prealloc_blob || 811 required_blob_size > ci->i_xattrs.prealloc_blob->alloc_len) { 812 struct ceph_buffer *blob; 813 814 spin_unlock(&ci->i_ceph_lock); 815 dout(" preaallocating new blob size=%d\n", required_blob_size); 816 blob = ceph_buffer_new(required_blob_size, GFP_NOFS); 817 if (!blob) 818 goto out; 819 spin_lock(&ci->i_ceph_lock); 820 if (ci->i_xattrs.prealloc_blob) 821 ceph_buffer_put(ci->i_xattrs.prealloc_blob); 822 ci->i_xattrs.prealloc_blob = blob; 823 goto retry; 824 } 825 826 err = __set_xattr(ci, newname, name_len, newval, 827 val_len, 1, 1, 1, &xattr); 828 829 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_XATTR_EXCL); 830 ci->i_xattrs.dirty = true; 831 inode->i_ctime = CURRENT_TIME; 832 833 spin_unlock(&ci->i_ceph_lock); 834 if (dirty) 835 __mark_inode_dirty(inode, dirty); 836 return err; 837 838 do_sync: 839 spin_unlock(&ci->i_ceph_lock); 840 err = ceph_sync_setxattr(dentry, name, value, size, flags); 841 out: 842 kfree(newname); 843 kfree(newval); 844 kfree(xattr); 845 return err; 846 } 847 848 static int ceph_send_removexattr(struct dentry *dentry, const char *name) 849 { 850 struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb); 851 struct ceph_mds_client *mdsc = fsc->mdsc; 852 struct inode *inode = dentry->d_inode; 853 struct inode *parent_inode; 854 struct ceph_mds_request *req; 855 int err; 856 857 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_RMXATTR, 858 USE_AUTH_MDS); 859 if (IS_ERR(req)) 860 return PTR_ERR(req); 861 req->r_inode = inode; 862 ihold(inode); 863 req->r_inode_drop = CEPH_CAP_XATTR_SHARED; 864 req->r_num_caps = 1; 865 req->r_path2 = kstrdup(name, GFP_NOFS); 866 867 parent_inode = ceph_get_dentry_parent_inode(dentry); 868 err = ceph_mdsc_do_request(mdsc, parent_inode, req); 869 iput(parent_inode); 870 ceph_mdsc_put_request(req); 871 return err; 872 } 873 874 int ceph_removexattr(struct dentry *dentry, const char *name) 875 { 876 struct inode *inode = dentry->d_inode; 877 struct ceph_vxattr *vxattr; 878 struct ceph_inode_info *ci = ceph_inode(inode); 879 int issued; 880 int err; 881 int required_blob_size; 882 int dirty; 883 884 if (ceph_snap(inode) != CEPH_NOSNAP) 885 return -EROFS; 886 887 if (!ceph_is_valid_xattr(name)) 888 return -EOPNOTSUPP; 889 890 vxattr = ceph_match_vxattr(inode, name); 891 if (vxattr && vxattr->readonly) 892 return -EOPNOTSUPP; 893 894 err = -ENOMEM; 895 spin_lock(&ci->i_ceph_lock); 896 retry: 897 issued = __ceph_caps_issued(ci, NULL); 898 dout("removexattr %p issued %s\n", inode, ceph_cap_string(issued)); 899 900 if (!(issued & CEPH_CAP_XATTR_EXCL)) 901 goto do_sync; 902 __build_xattrs(inode); 903 904 required_blob_size = __get_required_blob_size(ci, 0, 0); 905 906 if (!ci->i_xattrs.prealloc_blob || 907 required_blob_size > ci->i_xattrs.prealloc_blob->alloc_len) { 908 struct ceph_buffer *blob; 909 910 spin_unlock(&ci->i_ceph_lock); 911 dout(" preaallocating new blob size=%d\n", required_blob_size); 912 blob = ceph_buffer_new(required_blob_size, GFP_NOFS); 913 if (!blob) 914 goto out; 915 spin_lock(&ci->i_ceph_lock); 916 if (ci->i_xattrs.prealloc_blob) 917 ceph_buffer_put(ci->i_xattrs.prealloc_blob); 918 ci->i_xattrs.prealloc_blob = blob; 919 goto retry; 920 } 921 922 err = __remove_xattr_by_name(ceph_inode(inode), name); 923 924 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_XATTR_EXCL); 925 ci->i_xattrs.dirty = true; 926 inode->i_ctime = CURRENT_TIME; 927 spin_unlock(&ci->i_ceph_lock); 928 if (dirty) 929 __mark_inode_dirty(inode, dirty); 930 return err; 931 do_sync: 932 spin_unlock(&ci->i_ceph_lock); 933 err = ceph_send_removexattr(dentry, name); 934 out: 935 return err; 936 } 937 938