1 #include <linux/ceph/ceph_debug.h> 2 3 #include <linux/backing-dev.h> 4 #include <linux/fs.h> 5 #include <linux/mm.h> 6 #include <linux/pagemap.h> 7 #include <linux/writeback.h> /* generic_writepages */ 8 #include <linux/slab.h> 9 #include <linux/pagevec.h> 10 #include <linux/task_io_accounting_ops.h> 11 #include <linux/signal.h> 12 13 #include "super.h" 14 #include "mds_client.h" 15 #include "cache.h" 16 #include <linux/ceph/osd_client.h> 17 18 /* 19 * Ceph address space ops. 20 * 21 * There are a few funny things going on here. 22 * 23 * The page->private field is used to reference a struct 24 * ceph_snap_context for _every_ dirty page. This indicates which 25 * snapshot the page was logically dirtied in, and thus which snap 26 * context needs to be associated with the osd write during writeback. 27 * 28 * Similarly, struct ceph_inode_info maintains a set of counters to 29 * count dirty pages on the inode. In the absence of snapshots, 30 * i_wrbuffer_ref == i_wrbuffer_ref_head == the dirty page count. 31 * 32 * When a snapshot is taken (that is, when the client receives 33 * notification that a snapshot was taken), each inode with caps and 34 * with dirty pages (dirty pages implies there is a cap) gets a new 35 * ceph_cap_snap in the i_cap_snaps list (which is sorted in ascending 36 * order, new snaps go to the tail). The i_wrbuffer_ref_head count is 37 * moved to capsnap->dirty. (Unless a sync write is currently in 38 * progress. In that case, the capsnap is said to be "pending", new 39 * writes cannot start, and the capsnap isn't "finalized" until the 40 * write completes (or fails) and a final size/mtime for the inode for 41 * that snap can be settled upon.) i_wrbuffer_ref_head is reset to 0. 42 * 43 * On writeback, we must submit writes to the osd IN SNAP ORDER. So, 44 * we look for the first capsnap in i_cap_snaps and write out pages in 45 * that snap context _only_. Then we move on to the next capsnap, 46 * eventually reaching the "live" or "head" context (i.e., pages that 47 * are not yet snapped) and are writing the most recently dirtied 48 * pages. 49 * 50 * Invalidate and so forth must take care to ensure the dirty page 51 * accounting is preserved. 52 */ 53 54 #define CONGESTION_ON_THRESH(congestion_kb) (congestion_kb >> (PAGE_SHIFT-10)) 55 #define CONGESTION_OFF_THRESH(congestion_kb) \ 56 (CONGESTION_ON_THRESH(congestion_kb) - \ 57 (CONGESTION_ON_THRESH(congestion_kb) >> 2)) 58 59 static inline struct ceph_snap_context *page_snap_context(struct page *page) 60 { 61 if (PagePrivate(page)) 62 return (void *)page->private; 63 return NULL; 64 } 65 66 /* 67 * Dirty a page. Optimistically adjust accounting, on the assumption 68 * that we won't race with invalidate. If we do, readjust. 69 */ 70 static int ceph_set_page_dirty(struct page *page) 71 { 72 struct address_space *mapping = page->mapping; 73 struct inode *inode; 74 struct ceph_inode_info *ci; 75 struct ceph_snap_context *snapc; 76 int ret; 77 78 if (unlikely(!mapping)) 79 return !TestSetPageDirty(page); 80 81 if (PageDirty(page)) { 82 dout("%p set_page_dirty %p idx %lu -- already dirty\n", 83 mapping->host, page, page->index); 84 BUG_ON(!PagePrivate(page)); 85 return 0; 86 } 87 88 inode = mapping->host; 89 ci = ceph_inode(inode); 90 91 /* dirty the head */ 92 spin_lock(&ci->i_ceph_lock); 93 BUG_ON(ci->i_wr_ref == 0); // caller should hold Fw reference 94 if (__ceph_have_pending_cap_snap(ci)) { 95 struct ceph_cap_snap *capsnap = 96 list_last_entry(&ci->i_cap_snaps, 97 struct ceph_cap_snap, 98 ci_item); 99 snapc = ceph_get_snap_context(capsnap->context); 100 capsnap->dirty_pages++; 101 } else { 102 BUG_ON(!ci->i_head_snapc); 103 snapc = ceph_get_snap_context(ci->i_head_snapc); 104 ++ci->i_wrbuffer_ref_head; 105 } 106 if (ci->i_wrbuffer_ref == 0) 107 ihold(inode); 108 ++ci->i_wrbuffer_ref; 109 dout("%p set_page_dirty %p idx %lu head %d/%d -> %d/%d " 110 "snapc %p seq %lld (%d snaps)\n", 111 mapping->host, page, page->index, 112 ci->i_wrbuffer_ref-1, ci->i_wrbuffer_ref_head-1, 113 ci->i_wrbuffer_ref, ci->i_wrbuffer_ref_head, 114 snapc, snapc->seq, snapc->num_snaps); 115 spin_unlock(&ci->i_ceph_lock); 116 117 /* 118 * Reference snap context in page->private. Also set 119 * PagePrivate so that we get invalidatepage callback. 120 */ 121 BUG_ON(PagePrivate(page)); 122 page->private = (unsigned long)snapc; 123 SetPagePrivate(page); 124 125 ret = __set_page_dirty_nobuffers(page); 126 WARN_ON(!PageLocked(page)); 127 WARN_ON(!page->mapping); 128 129 return ret; 130 } 131 132 /* 133 * If we are truncating the full page (i.e. offset == 0), adjust the 134 * dirty page counters appropriately. Only called if there is private 135 * data on the page. 136 */ 137 static void ceph_invalidatepage(struct page *page, unsigned int offset, 138 unsigned int length) 139 { 140 struct inode *inode; 141 struct ceph_inode_info *ci; 142 struct ceph_snap_context *snapc = page_snap_context(page); 143 144 inode = page->mapping->host; 145 ci = ceph_inode(inode); 146 147 if (offset != 0 || length != PAGE_SIZE) { 148 dout("%p invalidatepage %p idx %lu partial dirty page %u~%u\n", 149 inode, page, page->index, offset, length); 150 return; 151 } 152 153 ceph_invalidate_fscache_page(inode, page); 154 155 WARN_ON(!PageLocked(page)); 156 if (!PagePrivate(page)) 157 return; 158 159 ClearPageChecked(page); 160 161 dout("%p invalidatepage %p idx %lu full dirty page\n", 162 inode, page, page->index); 163 164 ceph_put_wrbuffer_cap_refs(ci, 1, snapc); 165 ceph_put_snap_context(snapc); 166 page->private = 0; 167 ClearPagePrivate(page); 168 } 169 170 static int ceph_releasepage(struct page *page, gfp_t g) 171 { 172 dout("%p releasepage %p idx %lu (%sdirty)\n", page->mapping->host, 173 page, page->index, PageDirty(page) ? "" : "not "); 174 175 /* Can we release the page from the cache? */ 176 if (!ceph_release_fscache_page(page, g)) 177 return 0; 178 179 return !PagePrivate(page); 180 } 181 182 /* 183 * read a single page, without unlocking it. 184 */ 185 static int ceph_do_readpage(struct file *filp, struct page *page) 186 { 187 struct inode *inode = file_inode(filp); 188 struct ceph_inode_info *ci = ceph_inode(inode); 189 struct ceph_osd_client *osdc = 190 &ceph_inode_to_client(inode)->client->osdc; 191 int err = 0; 192 u64 off = page_offset(page); 193 u64 len = PAGE_SIZE; 194 195 if (off >= i_size_read(inode)) { 196 zero_user_segment(page, 0, PAGE_SIZE); 197 SetPageUptodate(page); 198 return 0; 199 } 200 201 if (ci->i_inline_version != CEPH_INLINE_NONE) { 202 /* 203 * Uptodate inline data should have been added 204 * into page cache while getting Fcr caps. 205 */ 206 if (off == 0) 207 return -EINVAL; 208 zero_user_segment(page, 0, PAGE_SIZE); 209 SetPageUptodate(page); 210 return 0; 211 } 212 213 err = ceph_readpage_from_fscache(inode, page); 214 if (err == 0) 215 return -EINPROGRESS; 216 217 dout("readpage inode %p file %p page %p index %lu\n", 218 inode, filp, page, page->index); 219 err = ceph_osdc_readpages(osdc, ceph_vino(inode), &ci->i_layout, 220 off, &len, 221 ci->i_truncate_seq, ci->i_truncate_size, 222 &page, 1, 0); 223 if (err == -ENOENT) 224 err = 0; 225 if (err < 0) { 226 SetPageError(page); 227 ceph_fscache_readpage_cancel(inode, page); 228 goto out; 229 } 230 if (err < PAGE_SIZE) 231 /* zero fill remainder of page */ 232 zero_user_segment(page, err, PAGE_SIZE); 233 else 234 flush_dcache_page(page); 235 236 SetPageUptodate(page); 237 ceph_readpage_to_fscache(inode, page); 238 239 out: 240 return err < 0 ? err : 0; 241 } 242 243 static int ceph_readpage(struct file *filp, struct page *page) 244 { 245 int r = ceph_do_readpage(filp, page); 246 if (r != -EINPROGRESS) 247 unlock_page(page); 248 else 249 r = 0; 250 return r; 251 } 252 253 /* 254 * Finish an async read(ahead) op. 255 */ 256 static void finish_read(struct ceph_osd_request *req) 257 { 258 struct inode *inode = req->r_inode; 259 struct ceph_osd_data *osd_data; 260 int rc = req->r_result <= 0 ? req->r_result : 0; 261 int bytes = req->r_result >= 0 ? req->r_result : 0; 262 int num_pages; 263 int i; 264 265 dout("finish_read %p req %p rc %d bytes %d\n", inode, req, rc, bytes); 266 267 /* unlock all pages, zeroing any data we didn't read */ 268 osd_data = osd_req_op_extent_osd_data(req, 0); 269 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES); 270 num_pages = calc_pages_for((u64)osd_data->alignment, 271 (u64)osd_data->length); 272 for (i = 0; i < num_pages; i++) { 273 struct page *page = osd_data->pages[i]; 274 275 if (rc < 0 && rc != -ENOENT) { 276 ceph_fscache_readpage_cancel(inode, page); 277 goto unlock; 278 } 279 if (bytes < (int)PAGE_SIZE) { 280 /* zero (remainder of) page */ 281 int s = bytes < 0 ? 0 : bytes; 282 zero_user_segment(page, s, PAGE_SIZE); 283 } 284 dout("finish_read %p uptodate %p idx %lu\n", inode, page, 285 page->index); 286 flush_dcache_page(page); 287 SetPageUptodate(page); 288 ceph_readpage_to_fscache(inode, page); 289 unlock: 290 unlock_page(page); 291 put_page(page); 292 bytes -= PAGE_SIZE; 293 } 294 kfree(osd_data->pages); 295 } 296 297 /* 298 * start an async read(ahead) operation. return nr_pages we submitted 299 * a read for on success, or negative error code. 300 */ 301 static int start_read(struct inode *inode, struct list_head *page_list, int max) 302 { 303 struct ceph_osd_client *osdc = 304 &ceph_inode_to_client(inode)->client->osdc; 305 struct ceph_inode_info *ci = ceph_inode(inode); 306 struct page *page = list_entry(page_list->prev, struct page, lru); 307 struct ceph_vino vino; 308 struct ceph_osd_request *req; 309 u64 off; 310 u64 len; 311 int i; 312 struct page **pages; 313 pgoff_t next_index; 314 int nr_pages = 0; 315 int got = 0; 316 int ret = 0; 317 318 if (!current->journal_info) { 319 /* caller of readpages does not hold buffer and read caps 320 * (fadvise, madvise and readahead cases) */ 321 int want = CEPH_CAP_FILE_CACHE; 322 ret = ceph_try_get_caps(ci, CEPH_CAP_FILE_RD, want, &got); 323 if (ret < 0) { 324 dout("start_read %p, error getting cap\n", inode); 325 } else if (!(got & want)) { 326 dout("start_read %p, no cache cap\n", inode); 327 ret = 0; 328 } 329 if (ret <= 0) { 330 if (got) 331 ceph_put_cap_refs(ci, got); 332 while (!list_empty(page_list)) { 333 page = list_entry(page_list->prev, 334 struct page, lru); 335 list_del(&page->lru); 336 put_page(page); 337 } 338 return ret; 339 } 340 } 341 342 off = (u64) page_offset(page); 343 344 /* count pages */ 345 next_index = page->index; 346 list_for_each_entry_reverse(page, page_list, lru) { 347 if (page->index != next_index) 348 break; 349 nr_pages++; 350 next_index++; 351 if (max && nr_pages == max) 352 break; 353 } 354 len = nr_pages << PAGE_SHIFT; 355 dout("start_read %p nr_pages %d is %lld~%lld\n", inode, nr_pages, 356 off, len); 357 vino = ceph_vino(inode); 358 req = ceph_osdc_new_request(osdc, &ci->i_layout, vino, off, &len, 359 0, 1, CEPH_OSD_OP_READ, 360 CEPH_OSD_FLAG_READ, NULL, 361 ci->i_truncate_seq, ci->i_truncate_size, 362 false); 363 if (IS_ERR(req)) { 364 ret = PTR_ERR(req); 365 goto out; 366 } 367 368 /* build page vector */ 369 nr_pages = calc_pages_for(0, len); 370 pages = kmalloc(sizeof(*pages) * nr_pages, GFP_KERNEL); 371 if (!pages) { 372 ret = -ENOMEM; 373 goto out_put; 374 } 375 for (i = 0; i < nr_pages; ++i) { 376 page = list_entry(page_list->prev, struct page, lru); 377 BUG_ON(PageLocked(page)); 378 list_del(&page->lru); 379 380 dout("start_read %p adding %p idx %lu\n", inode, page, 381 page->index); 382 if (add_to_page_cache_lru(page, &inode->i_data, page->index, 383 GFP_KERNEL)) { 384 ceph_fscache_uncache_page(inode, page); 385 put_page(page); 386 dout("start_read %p add_to_page_cache failed %p\n", 387 inode, page); 388 nr_pages = i; 389 if (nr_pages > 0) { 390 len = nr_pages << PAGE_SHIFT; 391 osd_req_op_extent_update(req, 0, len); 392 break; 393 } 394 goto out_pages; 395 } 396 pages[i] = page; 397 } 398 osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0, false, false); 399 req->r_callback = finish_read; 400 req->r_inode = inode; 401 402 dout("start_read %p starting %p %lld~%lld\n", inode, req, off, len); 403 ret = ceph_osdc_start_request(osdc, req, false); 404 if (ret < 0) 405 goto out_pages; 406 ceph_osdc_put_request(req); 407 408 /* After adding locked pages to page cache, the inode holds cache cap. 409 * So we can drop our cap refs. */ 410 if (got) 411 ceph_put_cap_refs(ci, got); 412 413 return nr_pages; 414 415 out_pages: 416 for (i = 0; i < nr_pages; ++i) { 417 ceph_fscache_readpage_cancel(inode, pages[i]); 418 unlock_page(pages[i]); 419 } 420 ceph_put_page_vector(pages, nr_pages, false); 421 out_put: 422 ceph_osdc_put_request(req); 423 out: 424 if (got) 425 ceph_put_cap_refs(ci, got); 426 return ret; 427 } 428 429 430 /* 431 * Read multiple pages. Leave pages we don't read + unlock in page_list; 432 * the caller (VM) cleans them up. 433 */ 434 static int ceph_readpages(struct file *file, struct address_space *mapping, 435 struct list_head *page_list, unsigned nr_pages) 436 { 437 struct inode *inode = file_inode(file); 438 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 439 int rc = 0; 440 int max = 0; 441 442 if (ceph_inode(inode)->i_inline_version != CEPH_INLINE_NONE) 443 return -EINVAL; 444 445 rc = ceph_readpages_from_fscache(mapping->host, mapping, page_list, 446 &nr_pages); 447 448 if (rc == 0) 449 goto out; 450 451 max = fsc->mount_options->rsize >> PAGE_SHIFT; 452 dout("readpages %p file %p nr_pages %d max %d\n", 453 inode, file, nr_pages, max); 454 while (!list_empty(page_list)) { 455 rc = start_read(inode, page_list, max); 456 if (rc < 0) 457 goto out; 458 } 459 out: 460 ceph_fscache_readpages_cancel(inode, page_list); 461 462 dout("readpages %p file %p ret %d\n", inode, file, rc); 463 return rc; 464 } 465 466 struct ceph_writeback_ctl 467 { 468 loff_t i_size; 469 u64 truncate_size; 470 u32 truncate_seq; 471 bool size_stable; 472 }; 473 474 /* 475 * Get ref for the oldest snapc for an inode with dirty data... that is, the 476 * only snap context we are allowed to write back. 477 */ 478 static struct ceph_snap_context * 479 get_oldest_context(struct inode *inode, struct ceph_writeback_ctl *ctl, 480 struct ceph_snap_context *page_snapc) 481 { 482 struct ceph_inode_info *ci = ceph_inode(inode); 483 struct ceph_snap_context *snapc = NULL; 484 struct ceph_cap_snap *capsnap = NULL; 485 486 spin_lock(&ci->i_ceph_lock); 487 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) { 488 dout(" cap_snap %p snapc %p has %d dirty pages\n", capsnap, 489 capsnap->context, capsnap->dirty_pages); 490 if (!capsnap->dirty_pages) 491 continue; 492 493 /* get i_size, truncate_{seq,size} for page_snapc? */ 494 if (snapc && capsnap->context != page_snapc) 495 continue; 496 497 if (ctl) { 498 if (capsnap->writing) { 499 ctl->i_size = i_size_read(inode); 500 ctl->size_stable = false; 501 } else { 502 ctl->i_size = capsnap->size; 503 ctl->size_stable = true; 504 } 505 ctl->truncate_size = capsnap->truncate_size; 506 ctl->truncate_seq = capsnap->truncate_seq; 507 } 508 509 if (snapc) 510 break; 511 512 snapc = ceph_get_snap_context(capsnap->context); 513 if (!page_snapc || 514 page_snapc == snapc || 515 page_snapc->seq > snapc->seq) 516 break; 517 } 518 if (!snapc && ci->i_wrbuffer_ref_head) { 519 snapc = ceph_get_snap_context(ci->i_head_snapc); 520 dout(" head snapc %p has %d dirty pages\n", 521 snapc, ci->i_wrbuffer_ref_head); 522 if (ctl) { 523 ctl->i_size = i_size_read(inode); 524 ctl->truncate_size = ci->i_truncate_size; 525 ctl->truncate_seq = ci->i_truncate_seq; 526 ctl->size_stable = false; 527 } 528 } 529 spin_unlock(&ci->i_ceph_lock); 530 return snapc; 531 } 532 533 static u64 get_writepages_data_length(struct inode *inode, 534 struct page *page, u64 start) 535 { 536 struct ceph_inode_info *ci = ceph_inode(inode); 537 struct ceph_snap_context *snapc = page_snap_context(page); 538 struct ceph_cap_snap *capsnap = NULL; 539 u64 end = i_size_read(inode); 540 541 if (snapc != ci->i_head_snapc) { 542 bool found = false; 543 spin_lock(&ci->i_ceph_lock); 544 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) { 545 if (capsnap->context == snapc) { 546 if (!capsnap->writing) 547 end = capsnap->size; 548 found = true; 549 break; 550 } 551 } 552 spin_unlock(&ci->i_ceph_lock); 553 WARN_ON(!found); 554 } 555 if (end > page_offset(page) + PAGE_SIZE) 556 end = page_offset(page) + PAGE_SIZE; 557 return end > start ? end - start : 0; 558 } 559 560 /* 561 * Write a single page, but leave the page locked. 562 * 563 * If we get a write error, set the page error bit, but still adjust the 564 * dirty page accounting (i.e., page is no longer dirty). 565 */ 566 static int writepage_nounlock(struct page *page, struct writeback_control *wbc) 567 { 568 struct inode *inode; 569 struct ceph_inode_info *ci; 570 struct ceph_fs_client *fsc; 571 struct ceph_snap_context *snapc, *oldest; 572 loff_t page_off = page_offset(page); 573 long writeback_stat; 574 int err, len = PAGE_SIZE; 575 struct ceph_writeback_ctl ceph_wbc; 576 577 dout("writepage %p idx %lu\n", page, page->index); 578 579 inode = page->mapping->host; 580 ci = ceph_inode(inode); 581 fsc = ceph_inode_to_client(inode); 582 583 /* verify this is a writeable snap context */ 584 snapc = page_snap_context(page); 585 if (!snapc) { 586 dout("writepage %p page %p not dirty?\n", inode, page); 587 return 0; 588 } 589 oldest = get_oldest_context(inode, &ceph_wbc, snapc); 590 if (snapc->seq > oldest->seq) { 591 dout("writepage %p page %p snapc %p not writeable - noop\n", 592 inode, page, snapc); 593 /* we should only noop if called by kswapd */ 594 WARN_ON(!(current->flags & PF_MEMALLOC)); 595 ceph_put_snap_context(oldest); 596 redirty_page_for_writepage(wbc, page); 597 return 0; 598 } 599 ceph_put_snap_context(oldest); 600 601 /* is this a partial page at end of file? */ 602 if (page_off >= ceph_wbc.i_size) { 603 dout("%p page eof %llu\n", page, ceph_wbc.i_size); 604 page->mapping->a_ops->invalidatepage(page, 0, PAGE_SIZE); 605 return 0; 606 } 607 608 if (ceph_wbc.i_size < page_off + len) 609 len = ceph_wbc.i_size - page_off; 610 611 dout("writepage %p page %p index %lu on %llu~%u snapc %p seq %lld\n", 612 inode, page, page->index, page_off, len, snapc, snapc->seq); 613 614 writeback_stat = atomic_long_inc_return(&fsc->writeback_count); 615 if (writeback_stat > 616 CONGESTION_ON_THRESH(fsc->mount_options->congestion_kb)) 617 set_bdi_congested(inode_to_bdi(inode), BLK_RW_ASYNC); 618 619 set_page_writeback(page); 620 err = ceph_osdc_writepages(&fsc->client->osdc, ceph_vino(inode), 621 &ci->i_layout, snapc, page_off, len, 622 ceph_wbc.truncate_seq, 623 ceph_wbc.truncate_size, 624 &inode->i_mtime, &page, 1); 625 if (err < 0) { 626 struct writeback_control tmp_wbc; 627 if (!wbc) 628 wbc = &tmp_wbc; 629 if (err == -ERESTARTSYS) { 630 /* killed by SIGKILL */ 631 dout("writepage interrupted page %p\n", page); 632 redirty_page_for_writepage(wbc, page); 633 end_page_writeback(page); 634 return err; 635 } 636 dout("writepage setting page/mapping error %d %p\n", 637 err, page); 638 SetPageError(page); 639 mapping_set_error(&inode->i_data, err); 640 wbc->pages_skipped++; 641 } else { 642 dout("writepage cleaned page %p\n", page); 643 err = 0; /* vfs expects us to return 0 */ 644 } 645 page->private = 0; 646 ClearPagePrivate(page); 647 end_page_writeback(page); 648 ceph_put_wrbuffer_cap_refs(ci, 1, snapc); 649 ceph_put_snap_context(snapc); /* page's reference */ 650 return err; 651 } 652 653 static int ceph_writepage(struct page *page, struct writeback_control *wbc) 654 { 655 int err; 656 struct inode *inode = page->mapping->host; 657 BUG_ON(!inode); 658 ihold(inode); 659 err = writepage_nounlock(page, wbc); 660 if (err == -ERESTARTSYS) { 661 /* direct memory reclaimer was killed by SIGKILL. return 0 662 * to prevent caller from setting mapping/page error */ 663 err = 0; 664 } 665 unlock_page(page); 666 iput(inode); 667 return err; 668 } 669 670 /* 671 * lame release_pages helper. release_pages() isn't exported to 672 * modules. 673 */ 674 static void ceph_release_pages(struct page **pages, int num) 675 { 676 struct pagevec pvec; 677 int i; 678 679 pagevec_init(&pvec, 0); 680 for (i = 0; i < num; i++) { 681 if (pagevec_add(&pvec, pages[i]) == 0) 682 pagevec_release(&pvec); 683 } 684 pagevec_release(&pvec); 685 } 686 687 /* 688 * async writeback completion handler. 689 * 690 * If we get an error, set the mapping error bit, but not the individual 691 * page error bits. 692 */ 693 static void writepages_finish(struct ceph_osd_request *req) 694 { 695 struct inode *inode = req->r_inode; 696 struct ceph_inode_info *ci = ceph_inode(inode); 697 struct ceph_osd_data *osd_data; 698 struct page *page; 699 int num_pages, total_pages = 0; 700 int i, j; 701 int rc = req->r_result; 702 struct ceph_snap_context *snapc = req->r_snapc; 703 struct address_space *mapping = inode->i_mapping; 704 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 705 bool remove_page; 706 707 dout("writepages_finish %p rc %d\n", inode, rc); 708 if (rc < 0) { 709 mapping_set_error(mapping, rc); 710 ceph_set_error_write(ci); 711 } else { 712 ceph_clear_error_write(ci); 713 } 714 715 /* 716 * We lost the cache cap, need to truncate the page before 717 * it is unlocked, otherwise we'd truncate it later in the 718 * page truncation thread, possibly losing some data that 719 * raced its way in 720 */ 721 remove_page = !(ceph_caps_issued(ci) & 722 (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)); 723 724 /* clean all pages */ 725 for (i = 0; i < req->r_num_ops; i++) { 726 if (req->r_ops[i].op != CEPH_OSD_OP_WRITE) 727 break; 728 729 osd_data = osd_req_op_extent_osd_data(req, i); 730 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES); 731 num_pages = calc_pages_for((u64)osd_data->alignment, 732 (u64)osd_data->length); 733 total_pages += num_pages; 734 for (j = 0; j < num_pages; j++) { 735 page = osd_data->pages[j]; 736 BUG_ON(!page); 737 WARN_ON(!PageUptodate(page)); 738 739 if (atomic_long_dec_return(&fsc->writeback_count) < 740 CONGESTION_OFF_THRESH( 741 fsc->mount_options->congestion_kb)) 742 clear_bdi_congested(inode_to_bdi(inode), 743 BLK_RW_ASYNC); 744 745 ceph_put_snap_context(page_snap_context(page)); 746 page->private = 0; 747 ClearPagePrivate(page); 748 dout("unlocking %p\n", page); 749 end_page_writeback(page); 750 751 if (remove_page) 752 generic_error_remove_page(inode->i_mapping, 753 page); 754 755 unlock_page(page); 756 } 757 dout("writepages_finish %p wrote %llu bytes cleaned %d pages\n", 758 inode, osd_data->length, rc >= 0 ? num_pages : 0); 759 760 ceph_release_pages(osd_data->pages, num_pages); 761 } 762 763 ceph_put_wrbuffer_cap_refs(ci, total_pages, snapc); 764 765 osd_data = osd_req_op_extent_osd_data(req, 0); 766 if (osd_data->pages_from_pool) 767 mempool_free(osd_data->pages, 768 ceph_sb_to_client(inode->i_sb)->wb_pagevec_pool); 769 else 770 kfree(osd_data->pages); 771 ceph_osdc_put_request(req); 772 } 773 774 /* 775 * initiate async writeback 776 */ 777 static int ceph_writepages_start(struct address_space *mapping, 778 struct writeback_control *wbc) 779 { 780 struct inode *inode = mapping->host; 781 struct ceph_inode_info *ci = ceph_inode(inode); 782 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 783 struct ceph_vino vino = ceph_vino(inode); 784 pgoff_t index, start, end; 785 int range_whole = 0; 786 int should_loop = 1; 787 pgoff_t max_pages = 0, max_pages_ever = 0; 788 struct ceph_snap_context *snapc = NULL, *last_snapc = NULL, *pgsnapc; 789 struct pagevec pvec; 790 int done = 0; 791 int rc = 0; 792 unsigned int wsize = i_blocksize(inode); 793 struct ceph_osd_request *req = NULL; 794 struct ceph_writeback_ctl ceph_wbc; 795 796 dout("writepages_start %p (mode=%s)\n", inode, 797 wbc->sync_mode == WB_SYNC_NONE ? "NONE" : 798 (wbc->sync_mode == WB_SYNC_ALL ? "ALL" : "HOLD")); 799 800 if (READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) { 801 if (ci->i_wrbuffer_ref > 0) { 802 pr_warn_ratelimited( 803 "writepage_start %p %lld forced umount\n", 804 inode, ceph_ino(inode)); 805 } 806 mapping_set_error(mapping, -EIO); 807 return -EIO; /* we're in a forced umount, don't write! */ 808 } 809 if (fsc->mount_options->wsize < wsize) 810 wsize = fsc->mount_options->wsize; 811 max_pages_ever = wsize >> PAGE_SHIFT; 812 813 pagevec_init(&pvec, 0); 814 815 /* where to start/end? */ 816 if (wbc->range_cyclic) { 817 start = mapping->writeback_index; /* Start from prev offset */ 818 end = -1; 819 dout(" cyclic, start at %lu\n", start); 820 } else { 821 start = wbc->range_start >> PAGE_SHIFT; 822 end = wbc->range_end >> PAGE_SHIFT; 823 if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) 824 range_whole = 1; 825 should_loop = 0; 826 dout(" not cyclic, %lu to %lu\n", start, end); 827 } 828 index = start; 829 830 retry: 831 /* find oldest snap context with dirty data */ 832 ceph_put_snap_context(snapc); 833 snapc = get_oldest_context(inode, &ceph_wbc, NULL); 834 if (!snapc) { 835 /* hmm, why does writepages get called when there 836 is no dirty data? */ 837 dout(" no snap context with dirty data?\n"); 838 goto out; 839 } 840 dout(" oldest snapc is %p seq %lld (%d snaps)\n", 841 snapc, snapc->seq, snapc->num_snaps); 842 843 if (last_snapc && snapc != last_snapc) { 844 /* if we switched to a newer snapc, restart our scan at the 845 * start of the original file range. */ 846 dout(" snapc differs from last pass, restarting at %lu\n", 847 index); 848 index = start; 849 } 850 last_snapc = snapc; 851 852 while (!done && index <= end) { 853 unsigned i; 854 int first; 855 pgoff_t strip_unit_end = 0; 856 int num_ops = 0, op_idx; 857 int pvec_pages, locked_pages = 0; 858 struct page **pages = NULL, **data_pages; 859 mempool_t *pool = NULL; /* Becomes non-null if mempool used */ 860 struct page *page; 861 int want; 862 u64 offset = 0, len = 0; 863 864 max_pages = max_pages_ever; 865 866 get_more_pages: 867 first = -1; 868 want = min(end - index, 869 min((pgoff_t)PAGEVEC_SIZE, 870 max_pages - (pgoff_t)locked_pages) - 1) 871 + 1; 872 pvec_pages = pagevec_lookup_tag(&pvec, mapping, &index, 873 PAGECACHE_TAG_DIRTY, 874 want); 875 dout("pagevec_lookup_tag got %d\n", pvec_pages); 876 if (!pvec_pages && !locked_pages) 877 break; 878 for (i = 0; i < pvec_pages && locked_pages < max_pages; i++) { 879 page = pvec.pages[i]; 880 dout("? %p idx %lu\n", page, page->index); 881 if (locked_pages == 0) 882 lock_page(page); /* first page */ 883 else if (!trylock_page(page)) 884 break; 885 886 /* only dirty pages, or our accounting breaks */ 887 if (unlikely(!PageDirty(page)) || 888 unlikely(page->mapping != mapping)) { 889 dout("!dirty or !mapping %p\n", page); 890 unlock_page(page); 891 break; 892 } 893 if (!wbc->range_cyclic && page->index > end) { 894 dout("end of range %p\n", page); 895 done = 1; 896 unlock_page(page); 897 break; 898 } 899 if (strip_unit_end && (page->index > strip_unit_end)) { 900 dout("end of strip unit %p\n", page); 901 unlock_page(page); 902 break; 903 } 904 if (wbc->sync_mode != WB_SYNC_NONE) { 905 dout("waiting on writeback %p\n", page); 906 wait_on_page_writeback(page); 907 } 908 if (page_offset(page) >= ceph_wbc.i_size) { 909 dout("%p page eof %llu\n", 910 page, ceph_wbc.i_size); 911 done = 1; 912 unlock_page(page); 913 break; 914 } 915 if (PageWriteback(page)) { 916 dout("%p under writeback\n", page); 917 unlock_page(page); 918 break; 919 } 920 921 /* only if matching snap context */ 922 pgsnapc = page_snap_context(page); 923 if (pgsnapc->seq > snapc->seq) { 924 dout("page snapc %p %lld > oldest %p %lld\n", 925 pgsnapc, pgsnapc->seq, snapc, snapc->seq); 926 unlock_page(page); 927 if (!locked_pages) 928 continue; /* keep looking for snap */ 929 break; 930 } 931 932 if (!clear_page_dirty_for_io(page)) { 933 dout("%p !clear_page_dirty_for_io\n", page); 934 unlock_page(page); 935 break; 936 } 937 938 /* 939 * We have something to write. If this is 940 * the first locked page this time through, 941 * calculate max possinle write size and 942 * allocate a page array 943 */ 944 if (locked_pages == 0) { 945 u64 objnum; 946 u64 objoff; 947 948 /* prepare async write request */ 949 offset = (u64)page_offset(page); 950 len = wsize; 951 952 rc = ceph_calc_file_object_mapping(&ci->i_layout, 953 offset, len, 954 &objnum, &objoff, 955 &len); 956 if (rc < 0) { 957 unlock_page(page); 958 break; 959 } 960 961 num_ops = 1; 962 strip_unit_end = page->index + 963 ((len - 1) >> PAGE_SHIFT); 964 965 BUG_ON(pages); 966 max_pages = calc_pages_for(0, (u64)len); 967 pages = kmalloc(max_pages * sizeof (*pages), 968 GFP_NOFS); 969 if (!pages) { 970 pool = fsc->wb_pagevec_pool; 971 pages = mempool_alloc(pool, GFP_NOFS); 972 BUG_ON(!pages); 973 } 974 975 len = 0; 976 } else if (page->index != 977 (offset + len) >> PAGE_SHIFT) { 978 if (num_ops >= (pool ? CEPH_OSD_SLAB_OPS : 979 CEPH_OSD_MAX_OPS)) { 980 redirty_page_for_writepage(wbc, page); 981 unlock_page(page); 982 break; 983 } 984 985 num_ops++; 986 offset = (u64)page_offset(page); 987 len = 0; 988 } 989 990 /* note position of first page in pvec */ 991 if (first < 0) 992 first = i; 993 dout("%p will write page %p idx %lu\n", 994 inode, page, page->index); 995 996 if (atomic_long_inc_return(&fsc->writeback_count) > 997 CONGESTION_ON_THRESH( 998 fsc->mount_options->congestion_kb)) { 999 set_bdi_congested(inode_to_bdi(inode), 1000 BLK_RW_ASYNC); 1001 } 1002 1003 pages[locked_pages] = page; 1004 locked_pages++; 1005 len += PAGE_SIZE; 1006 } 1007 1008 /* did we get anything? */ 1009 if (!locked_pages) 1010 goto release_pvec_pages; 1011 if (i) { 1012 int j; 1013 BUG_ON(!locked_pages || first < 0); 1014 1015 if (pvec_pages && i == pvec_pages && 1016 locked_pages < max_pages) { 1017 dout("reached end pvec, trying for more\n"); 1018 pagevec_reinit(&pvec); 1019 goto get_more_pages; 1020 } 1021 1022 /* shift unused pages over in the pvec... we 1023 * will need to release them below. */ 1024 for (j = i; j < pvec_pages; j++) { 1025 dout(" pvec leftover page %p\n", pvec.pages[j]); 1026 pvec.pages[j-i+first] = pvec.pages[j]; 1027 } 1028 pvec.nr -= i-first; 1029 } 1030 1031 new_request: 1032 offset = page_offset(pages[0]); 1033 len = wsize; 1034 1035 req = ceph_osdc_new_request(&fsc->client->osdc, 1036 &ci->i_layout, vino, 1037 offset, &len, 0, num_ops, 1038 CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE, 1039 snapc, ceph_wbc.truncate_seq, 1040 ceph_wbc.truncate_size, false); 1041 if (IS_ERR(req)) { 1042 req = ceph_osdc_new_request(&fsc->client->osdc, 1043 &ci->i_layout, vino, 1044 offset, &len, 0, 1045 min(num_ops, 1046 CEPH_OSD_SLAB_OPS), 1047 CEPH_OSD_OP_WRITE, 1048 CEPH_OSD_FLAG_WRITE, 1049 snapc, ceph_wbc.truncate_seq, 1050 ceph_wbc.truncate_size, true); 1051 BUG_ON(IS_ERR(req)); 1052 } 1053 BUG_ON(len < page_offset(pages[locked_pages - 1]) + 1054 PAGE_SIZE - offset); 1055 1056 req->r_callback = writepages_finish; 1057 req->r_inode = inode; 1058 1059 /* Format the osd request message and submit the write */ 1060 len = 0; 1061 data_pages = pages; 1062 op_idx = 0; 1063 for (i = 0; i < locked_pages; i++) { 1064 u64 cur_offset = page_offset(pages[i]); 1065 if (offset + len != cur_offset) { 1066 if (op_idx + 1 == req->r_num_ops) 1067 break; 1068 osd_req_op_extent_dup_last(req, op_idx, 1069 cur_offset - offset); 1070 dout("writepages got pages at %llu~%llu\n", 1071 offset, len); 1072 osd_req_op_extent_osd_data_pages(req, op_idx, 1073 data_pages, len, 0, 1074 !!pool, false); 1075 osd_req_op_extent_update(req, op_idx, len); 1076 1077 len = 0; 1078 offset = cur_offset; 1079 data_pages = pages + i; 1080 op_idx++; 1081 } 1082 1083 set_page_writeback(pages[i]); 1084 len += PAGE_SIZE; 1085 } 1086 1087 if (ceph_wbc.size_stable) { 1088 len = min(len, ceph_wbc.i_size - offset); 1089 } else if (i == locked_pages) { 1090 /* writepages_finish() clears writeback pages 1091 * according to the data length, so make sure 1092 * data length covers all locked pages */ 1093 u64 min_len = len + 1 - PAGE_SIZE; 1094 len = get_writepages_data_length(inode, pages[i - 1], 1095 offset); 1096 len = max(len, min_len); 1097 } 1098 dout("writepages got pages at %llu~%llu\n", offset, len); 1099 1100 osd_req_op_extent_osd_data_pages(req, op_idx, data_pages, len, 1101 0, !!pool, false); 1102 osd_req_op_extent_update(req, op_idx, len); 1103 1104 BUG_ON(op_idx + 1 != req->r_num_ops); 1105 1106 pool = NULL; 1107 if (i < locked_pages) { 1108 BUG_ON(num_ops <= req->r_num_ops); 1109 num_ops -= req->r_num_ops; 1110 locked_pages -= i; 1111 1112 /* allocate new pages array for next request */ 1113 data_pages = pages; 1114 pages = kmalloc(locked_pages * sizeof (*pages), 1115 GFP_NOFS); 1116 if (!pages) { 1117 pool = fsc->wb_pagevec_pool; 1118 pages = mempool_alloc(pool, GFP_NOFS); 1119 BUG_ON(!pages); 1120 } 1121 memcpy(pages, data_pages + i, 1122 locked_pages * sizeof(*pages)); 1123 memset(data_pages + i, 0, 1124 locked_pages * sizeof(*pages)); 1125 } else { 1126 BUG_ON(num_ops != req->r_num_ops); 1127 index = pages[i - 1]->index + 1; 1128 /* request message now owns the pages array */ 1129 pages = NULL; 1130 } 1131 1132 req->r_mtime = inode->i_mtime; 1133 rc = ceph_osdc_start_request(&fsc->client->osdc, req, true); 1134 BUG_ON(rc); 1135 req = NULL; 1136 1137 wbc->nr_to_write -= i; 1138 if (pages) 1139 goto new_request; 1140 1141 if (wbc->nr_to_write <= 0) 1142 done = 1; 1143 1144 release_pvec_pages: 1145 dout("pagevec_release on %d pages (%p)\n", (int)pvec.nr, 1146 pvec.nr ? pvec.pages[0] : NULL); 1147 pagevec_release(&pvec); 1148 1149 if (locked_pages && !done) 1150 goto retry; 1151 } 1152 1153 if (should_loop && !done) { 1154 /* more to do; loop back to beginning of file */ 1155 dout("writepages looping back to beginning of file\n"); 1156 should_loop = 0; 1157 index = 0; 1158 goto retry; 1159 } 1160 1161 if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) 1162 mapping->writeback_index = index; 1163 1164 out: 1165 ceph_osdc_put_request(req); 1166 ceph_put_snap_context(snapc); 1167 dout("writepages done, rc = %d\n", rc); 1168 return rc; 1169 } 1170 1171 1172 1173 /* 1174 * See if a given @snapc is either writeable, or already written. 1175 */ 1176 static int context_is_writeable_or_written(struct inode *inode, 1177 struct ceph_snap_context *snapc) 1178 { 1179 struct ceph_snap_context *oldest = get_oldest_context(inode, NULL, NULL); 1180 int ret = !oldest || snapc->seq <= oldest->seq; 1181 1182 ceph_put_snap_context(oldest); 1183 return ret; 1184 } 1185 1186 /* 1187 * We are only allowed to write into/dirty the page if the page is 1188 * clean, or already dirty within the same snap context. 1189 * 1190 * called with page locked. 1191 * return success with page locked, 1192 * or any failure (incl -EAGAIN) with page unlocked. 1193 */ 1194 static int ceph_update_writeable_page(struct file *file, 1195 loff_t pos, unsigned len, 1196 struct page *page) 1197 { 1198 struct inode *inode = file_inode(file); 1199 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 1200 struct ceph_inode_info *ci = ceph_inode(inode); 1201 loff_t page_off = pos & PAGE_MASK; 1202 int pos_in_page = pos & ~PAGE_MASK; 1203 int end_in_page = pos_in_page + len; 1204 loff_t i_size; 1205 int r; 1206 struct ceph_snap_context *snapc, *oldest; 1207 1208 if (READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) { 1209 dout(" page %p forced umount\n", page); 1210 unlock_page(page); 1211 return -EIO; 1212 } 1213 1214 retry_locked: 1215 /* writepages currently holds page lock, but if we change that later, */ 1216 wait_on_page_writeback(page); 1217 1218 snapc = page_snap_context(page); 1219 if (snapc && snapc != ci->i_head_snapc) { 1220 /* 1221 * this page is already dirty in another (older) snap 1222 * context! is it writeable now? 1223 */ 1224 oldest = get_oldest_context(inode, NULL, NULL); 1225 if (snapc->seq > oldest->seq) { 1226 ceph_put_snap_context(oldest); 1227 dout(" page %p snapc %p not current or oldest\n", 1228 page, snapc); 1229 /* 1230 * queue for writeback, and wait for snapc to 1231 * be writeable or written 1232 */ 1233 snapc = ceph_get_snap_context(snapc); 1234 unlock_page(page); 1235 ceph_queue_writeback(inode); 1236 r = wait_event_killable(ci->i_cap_wq, 1237 context_is_writeable_or_written(inode, snapc)); 1238 ceph_put_snap_context(snapc); 1239 if (r == -ERESTARTSYS) 1240 return r; 1241 return -EAGAIN; 1242 } 1243 ceph_put_snap_context(oldest); 1244 1245 /* yay, writeable, do it now (without dropping page lock) */ 1246 dout(" page %p snapc %p not current, but oldest\n", 1247 page, snapc); 1248 if (!clear_page_dirty_for_io(page)) 1249 goto retry_locked; 1250 r = writepage_nounlock(page, NULL); 1251 if (r < 0) 1252 goto fail_unlock; 1253 goto retry_locked; 1254 } 1255 1256 if (PageUptodate(page)) { 1257 dout(" page %p already uptodate\n", page); 1258 return 0; 1259 } 1260 1261 /* full page? */ 1262 if (pos_in_page == 0 && len == PAGE_SIZE) 1263 return 0; 1264 1265 /* past end of file? */ 1266 i_size = i_size_read(inode); 1267 1268 if (page_off >= i_size || 1269 (pos_in_page == 0 && (pos+len) >= i_size && 1270 end_in_page - pos_in_page != PAGE_SIZE)) { 1271 dout(" zeroing %p 0 - %d and %d - %d\n", 1272 page, pos_in_page, end_in_page, (int)PAGE_SIZE); 1273 zero_user_segments(page, 1274 0, pos_in_page, 1275 end_in_page, PAGE_SIZE); 1276 return 0; 1277 } 1278 1279 /* we need to read it. */ 1280 r = ceph_do_readpage(file, page); 1281 if (r < 0) { 1282 if (r == -EINPROGRESS) 1283 return -EAGAIN; 1284 goto fail_unlock; 1285 } 1286 goto retry_locked; 1287 fail_unlock: 1288 unlock_page(page); 1289 return r; 1290 } 1291 1292 /* 1293 * We are only allowed to write into/dirty the page if the page is 1294 * clean, or already dirty within the same snap context. 1295 */ 1296 static int ceph_write_begin(struct file *file, struct address_space *mapping, 1297 loff_t pos, unsigned len, unsigned flags, 1298 struct page **pagep, void **fsdata) 1299 { 1300 struct inode *inode = file_inode(file); 1301 struct page *page; 1302 pgoff_t index = pos >> PAGE_SHIFT; 1303 int r; 1304 1305 do { 1306 /* get a page */ 1307 page = grab_cache_page_write_begin(mapping, index, 0); 1308 if (!page) 1309 return -ENOMEM; 1310 1311 dout("write_begin file %p inode %p page %p %d~%d\n", file, 1312 inode, page, (int)pos, (int)len); 1313 1314 r = ceph_update_writeable_page(file, pos, len, page); 1315 if (r < 0) 1316 put_page(page); 1317 else 1318 *pagep = page; 1319 } while (r == -EAGAIN); 1320 1321 return r; 1322 } 1323 1324 /* 1325 * we don't do anything in here that simple_write_end doesn't do 1326 * except adjust dirty page accounting 1327 */ 1328 static int ceph_write_end(struct file *file, struct address_space *mapping, 1329 loff_t pos, unsigned len, unsigned copied, 1330 struct page *page, void *fsdata) 1331 { 1332 struct inode *inode = file_inode(file); 1333 bool check_cap = false; 1334 1335 dout("write_end file %p inode %p page %p %d~%d (%d)\n", file, 1336 inode, page, (int)pos, (int)copied, (int)len); 1337 1338 /* zero the stale part of the page if we did a short copy */ 1339 if (!PageUptodate(page)) { 1340 if (copied < len) { 1341 copied = 0; 1342 goto out; 1343 } 1344 SetPageUptodate(page); 1345 } 1346 1347 /* did file size increase? */ 1348 if (pos+copied > i_size_read(inode)) 1349 check_cap = ceph_inode_set_size(inode, pos+copied); 1350 1351 set_page_dirty(page); 1352 1353 out: 1354 unlock_page(page); 1355 put_page(page); 1356 1357 if (check_cap) 1358 ceph_check_caps(ceph_inode(inode), CHECK_CAPS_AUTHONLY, NULL); 1359 1360 return copied; 1361 } 1362 1363 /* 1364 * we set .direct_IO to indicate direct io is supported, but since we 1365 * intercept O_DIRECT reads and writes early, this function should 1366 * never get called. 1367 */ 1368 static ssize_t ceph_direct_io(struct kiocb *iocb, struct iov_iter *iter) 1369 { 1370 WARN_ON(1); 1371 return -EINVAL; 1372 } 1373 1374 const struct address_space_operations ceph_aops = { 1375 .readpage = ceph_readpage, 1376 .readpages = ceph_readpages, 1377 .writepage = ceph_writepage, 1378 .writepages = ceph_writepages_start, 1379 .write_begin = ceph_write_begin, 1380 .write_end = ceph_write_end, 1381 .set_page_dirty = ceph_set_page_dirty, 1382 .invalidatepage = ceph_invalidatepage, 1383 .releasepage = ceph_releasepage, 1384 .direct_IO = ceph_direct_io, 1385 }; 1386 1387 static void ceph_block_sigs(sigset_t *oldset) 1388 { 1389 sigset_t mask; 1390 siginitsetinv(&mask, sigmask(SIGKILL)); 1391 sigprocmask(SIG_BLOCK, &mask, oldset); 1392 } 1393 1394 static void ceph_restore_sigs(sigset_t *oldset) 1395 { 1396 sigprocmask(SIG_SETMASK, oldset, NULL); 1397 } 1398 1399 /* 1400 * vm ops 1401 */ 1402 static int ceph_filemap_fault(struct vm_fault *vmf) 1403 { 1404 struct vm_area_struct *vma = vmf->vma; 1405 struct inode *inode = file_inode(vma->vm_file); 1406 struct ceph_inode_info *ci = ceph_inode(inode); 1407 struct ceph_file_info *fi = vma->vm_file->private_data; 1408 struct page *pinned_page = NULL; 1409 loff_t off = vmf->pgoff << PAGE_SHIFT; 1410 int want, got, ret; 1411 sigset_t oldset; 1412 1413 ceph_block_sigs(&oldset); 1414 1415 dout("filemap_fault %p %llx.%llx %llu~%zd trying to get caps\n", 1416 inode, ceph_vinop(inode), off, (size_t)PAGE_SIZE); 1417 if (fi->fmode & CEPH_FILE_MODE_LAZY) 1418 want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO; 1419 else 1420 want = CEPH_CAP_FILE_CACHE; 1421 1422 got = 0; 1423 ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, -1, &got, &pinned_page); 1424 if (ret < 0) 1425 goto out_restore; 1426 1427 dout("filemap_fault %p %llu~%zd got cap refs on %s\n", 1428 inode, off, (size_t)PAGE_SIZE, ceph_cap_string(got)); 1429 1430 if ((got & (CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO)) || 1431 ci->i_inline_version == CEPH_INLINE_NONE) { 1432 current->journal_info = vma->vm_file; 1433 ret = filemap_fault(vmf); 1434 current->journal_info = NULL; 1435 } else 1436 ret = -EAGAIN; 1437 1438 dout("filemap_fault %p %llu~%zd dropping cap refs on %s ret %d\n", 1439 inode, off, (size_t)PAGE_SIZE, ceph_cap_string(got), ret); 1440 if (pinned_page) 1441 put_page(pinned_page); 1442 ceph_put_cap_refs(ci, got); 1443 1444 if (ret != -EAGAIN) 1445 goto out_restore; 1446 1447 /* read inline data */ 1448 if (off >= PAGE_SIZE) { 1449 /* does not support inline data > PAGE_SIZE */ 1450 ret = VM_FAULT_SIGBUS; 1451 } else { 1452 int ret1; 1453 struct address_space *mapping = inode->i_mapping; 1454 struct page *page = find_or_create_page(mapping, 0, 1455 mapping_gfp_constraint(mapping, 1456 ~__GFP_FS)); 1457 if (!page) { 1458 ret = VM_FAULT_OOM; 1459 goto out_inline; 1460 } 1461 ret1 = __ceph_do_getattr(inode, page, 1462 CEPH_STAT_CAP_INLINE_DATA, true); 1463 if (ret1 < 0 || off >= i_size_read(inode)) { 1464 unlock_page(page); 1465 put_page(page); 1466 if (ret1 < 0) 1467 ret = ret1; 1468 else 1469 ret = VM_FAULT_SIGBUS; 1470 goto out_inline; 1471 } 1472 if (ret1 < PAGE_SIZE) 1473 zero_user_segment(page, ret1, PAGE_SIZE); 1474 else 1475 flush_dcache_page(page); 1476 SetPageUptodate(page); 1477 vmf->page = page; 1478 ret = VM_FAULT_MAJOR | VM_FAULT_LOCKED; 1479 out_inline: 1480 dout("filemap_fault %p %llu~%zd read inline data ret %d\n", 1481 inode, off, (size_t)PAGE_SIZE, ret); 1482 } 1483 out_restore: 1484 ceph_restore_sigs(&oldset); 1485 if (ret < 0) 1486 ret = (ret == -ENOMEM) ? VM_FAULT_OOM : VM_FAULT_SIGBUS; 1487 1488 return ret; 1489 } 1490 1491 /* 1492 * Reuse write_begin here for simplicity. 1493 */ 1494 static int ceph_page_mkwrite(struct vm_fault *vmf) 1495 { 1496 struct vm_area_struct *vma = vmf->vma; 1497 struct inode *inode = file_inode(vma->vm_file); 1498 struct ceph_inode_info *ci = ceph_inode(inode); 1499 struct ceph_file_info *fi = vma->vm_file->private_data; 1500 struct ceph_cap_flush *prealloc_cf; 1501 struct page *page = vmf->page; 1502 loff_t off = page_offset(page); 1503 loff_t size = i_size_read(inode); 1504 size_t len; 1505 int want, got, ret; 1506 sigset_t oldset; 1507 1508 prealloc_cf = ceph_alloc_cap_flush(); 1509 if (!prealloc_cf) 1510 return VM_FAULT_OOM; 1511 1512 ceph_block_sigs(&oldset); 1513 1514 if (ci->i_inline_version != CEPH_INLINE_NONE) { 1515 struct page *locked_page = NULL; 1516 if (off == 0) { 1517 lock_page(page); 1518 locked_page = page; 1519 } 1520 ret = ceph_uninline_data(vma->vm_file, locked_page); 1521 if (locked_page) 1522 unlock_page(locked_page); 1523 if (ret < 0) 1524 goto out_free; 1525 } 1526 1527 if (off + PAGE_SIZE <= size) 1528 len = PAGE_SIZE; 1529 else 1530 len = size & ~PAGE_MASK; 1531 1532 dout("page_mkwrite %p %llx.%llx %llu~%zd getting caps i_size %llu\n", 1533 inode, ceph_vinop(inode), off, len, size); 1534 if (fi->fmode & CEPH_FILE_MODE_LAZY) 1535 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO; 1536 else 1537 want = CEPH_CAP_FILE_BUFFER; 1538 1539 got = 0; 1540 ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, off + len, 1541 &got, NULL); 1542 if (ret < 0) 1543 goto out_free; 1544 1545 dout("page_mkwrite %p %llu~%zd got cap refs on %s\n", 1546 inode, off, len, ceph_cap_string(got)); 1547 1548 /* Update time before taking page lock */ 1549 file_update_time(vma->vm_file); 1550 1551 do { 1552 lock_page(page); 1553 1554 if ((off > size) || (page->mapping != inode->i_mapping)) { 1555 unlock_page(page); 1556 ret = VM_FAULT_NOPAGE; 1557 break; 1558 } 1559 1560 ret = ceph_update_writeable_page(vma->vm_file, off, len, page); 1561 if (ret >= 0) { 1562 /* success. we'll keep the page locked. */ 1563 set_page_dirty(page); 1564 ret = VM_FAULT_LOCKED; 1565 } 1566 } while (ret == -EAGAIN); 1567 1568 if (ret == VM_FAULT_LOCKED || 1569 ci->i_inline_version != CEPH_INLINE_NONE) { 1570 int dirty; 1571 spin_lock(&ci->i_ceph_lock); 1572 ci->i_inline_version = CEPH_INLINE_NONE; 1573 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR, 1574 &prealloc_cf); 1575 spin_unlock(&ci->i_ceph_lock); 1576 if (dirty) 1577 __mark_inode_dirty(inode, dirty); 1578 } 1579 1580 dout("page_mkwrite %p %llu~%zd dropping cap refs on %s ret %d\n", 1581 inode, off, len, ceph_cap_string(got), ret); 1582 ceph_put_cap_refs(ci, got); 1583 out_free: 1584 ceph_restore_sigs(&oldset); 1585 ceph_free_cap_flush(prealloc_cf); 1586 if (ret < 0) 1587 ret = (ret == -ENOMEM) ? VM_FAULT_OOM : VM_FAULT_SIGBUS; 1588 return ret; 1589 } 1590 1591 void ceph_fill_inline_data(struct inode *inode, struct page *locked_page, 1592 char *data, size_t len) 1593 { 1594 struct address_space *mapping = inode->i_mapping; 1595 struct page *page; 1596 1597 if (locked_page) { 1598 page = locked_page; 1599 } else { 1600 if (i_size_read(inode) == 0) 1601 return; 1602 page = find_or_create_page(mapping, 0, 1603 mapping_gfp_constraint(mapping, 1604 ~__GFP_FS)); 1605 if (!page) 1606 return; 1607 if (PageUptodate(page)) { 1608 unlock_page(page); 1609 put_page(page); 1610 return; 1611 } 1612 } 1613 1614 dout("fill_inline_data %p %llx.%llx len %zu locked_page %p\n", 1615 inode, ceph_vinop(inode), len, locked_page); 1616 1617 if (len > 0) { 1618 void *kaddr = kmap_atomic(page); 1619 memcpy(kaddr, data, len); 1620 kunmap_atomic(kaddr); 1621 } 1622 1623 if (page != locked_page) { 1624 if (len < PAGE_SIZE) 1625 zero_user_segment(page, len, PAGE_SIZE); 1626 else 1627 flush_dcache_page(page); 1628 1629 SetPageUptodate(page); 1630 unlock_page(page); 1631 put_page(page); 1632 } 1633 } 1634 1635 int ceph_uninline_data(struct file *filp, struct page *locked_page) 1636 { 1637 struct inode *inode = file_inode(filp); 1638 struct ceph_inode_info *ci = ceph_inode(inode); 1639 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 1640 struct ceph_osd_request *req; 1641 struct page *page = NULL; 1642 u64 len, inline_version; 1643 int err = 0; 1644 bool from_pagecache = false; 1645 1646 spin_lock(&ci->i_ceph_lock); 1647 inline_version = ci->i_inline_version; 1648 spin_unlock(&ci->i_ceph_lock); 1649 1650 dout("uninline_data %p %llx.%llx inline_version %llu\n", 1651 inode, ceph_vinop(inode), inline_version); 1652 1653 if (inline_version == 1 || /* initial version, no data */ 1654 inline_version == CEPH_INLINE_NONE) 1655 goto out; 1656 1657 if (locked_page) { 1658 page = locked_page; 1659 WARN_ON(!PageUptodate(page)); 1660 } else if (ceph_caps_issued(ci) & 1661 (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) { 1662 page = find_get_page(inode->i_mapping, 0); 1663 if (page) { 1664 if (PageUptodate(page)) { 1665 from_pagecache = true; 1666 lock_page(page); 1667 } else { 1668 put_page(page); 1669 page = NULL; 1670 } 1671 } 1672 } 1673 1674 if (page) { 1675 len = i_size_read(inode); 1676 if (len > PAGE_SIZE) 1677 len = PAGE_SIZE; 1678 } else { 1679 page = __page_cache_alloc(GFP_NOFS); 1680 if (!page) { 1681 err = -ENOMEM; 1682 goto out; 1683 } 1684 err = __ceph_do_getattr(inode, page, 1685 CEPH_STAT_CAP_INLINE_DATA, true); 1686 if (err < 0) { 1687 /* no inline data */ 1688 if (err == -ENODATA) 1689 err = 0; 1690 goto out; 1691 } 1692 len = err; 1693 } 1694 1695 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, 1696 ceph_vino(inode), 0, &len, 0, 1, 1697 CEPH_OSD_OP_CREATE, CEPH_OSD_FLAG_WRITE, 1698 NULL, 0, 0, false); 1699 if (IS_ERR(req)) { 1700 err = PTR_ERR(req); 1701 goto out; 1702 } 1703 1704 req->r_mtime = inode->i_mtime; 1705 err = ceph_osdc_start_request(&fsc->client->osdc, req, false); 1706 if (!err) 1707 err = ceph_osdc_wait_request(&fsc->client->osdc, req); 1708 ceph_osdc_put_request(req); 1709 if (err < 0) 1710 goto out; 1711 1712 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, 1713 ceph_vino(inode), 0, &len, 1, 3, 1714 CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE, 1715 NULL, ci->i_truncate_seq, 1716 ci->i_truncate_size, false); 1717 if (IS_ERR(req)) { 1718 err = PTR_ERR(req); 1719 goto out; 1720 } 1721 1722 osd_req_op_extent_osd_data_pages(req, 1, &page, len, 0, false, false); 1723 1724 { 1725 __le64 xattr_buf = cpu_to_le64(inline_version); 1726 err = osd_req_op_xattr_init(req, 0, CEPH_OSD_OP_CMPXATTR, 1727 "inline_version", &xattr_buf, 1728 sizeof(xattr_buf), 1729 CEPH_OSD_CMPXATTR_OP_GT, 1730 CEPH_OSD_CMPXATTR_MODE_U64); 1731 if (err) 1732 goto out_put; 1733 } 1734 1735 { 1736 char xattr_buf[32]; 1737 int xattr_len = snprintf(xattr_buf, sizeof(xattr_buf), 1738 "%llu", inline_version); 1739 err = osd_req_op_xattr_init(req, 2, CEPH_OSD_OP_SETXATTR, 1740 "inline_version", 1741 xattr_buf, xattr_len, 0, 0); 1742 if (err) 1743 goto out_put; 1744 } 1745 1746 req->r_mtime = inode->i_mtime; 1747 err = ceph_osdc_start_request(&fsc->client->osdc, req, false); 1748 if (!err) 1749 err = ceph_osdc_wait_request(&fsc->client->osdc, req); 1750 out_put: 1751 ceph_osdc_put_request(req); 1752 if (err == -ECANCELED) 1753 err = 0; 1754 out: 1755 if (page && page != locked_page) { 1756 if (from_pagecache) { 1757 unlock_page(page); 1758 put_page(page); 1759 } else 1760 __free_pages(page, 0); 1761 } 1762 1763 dout("uninline_data %p %llx.%llx inline_version %llu = %d\n", 1764 inode, ceph_vinop(inode), inline_version, err); 1765 return err; 1766 } 1767 1768 static const struct vm_operations_struct ceph_vmops = { 1769 .fault = ceph_filemap_fault, 1770 .page_mkwrite = ceph_page_mkwrite, 1771 }; 1772 1773 int ceph_mmap(struct file *file, struct vm_area_struct *vma) 1774 { 1775 struct address_space *mapping = file->f_mapping; 1776 1777 if (!mapping->a_ops->readpage) 1778 return -ENOEXEC; 1779 file_accessed(file); 1780 vma->vm_ops = &ceph_vmops; 1781 return 0; 1782 } 1783 1784 enum { 1785 POOL_READ = 1, 1786 POOL_WRITE = 2, 1787 }; 1788 1789 static int __ceph_pool_perm_get(struct ceph_inode_info *ci, 1790 s64 pool, struct ceph_string *pool_ns) 1791 { 1792 struct ceph_fs_client *fsc = ceph_inode_to_client(&ci->vfs_inode); 1793 struct ceph_mds_client *mdsc = fsc->mdsc; 1794 struct ceph_osd_request *rd_req = NULL, *wr_req = NULL; 1795 struct rb_node **p, *parent; 1796 struct ceph_pool_perm *perm; 1797 struct page **pages; 1798 size_t pool_ns_len; 1799 int err = 0, err2 = 0, have = 0; 1800 1801 down_read(&mdsc->pool_perm_rwsem); 1802 p = &mdsc->pool_perm_tree.rb_node; 1803 while (*p) { 1804 perm = rb_entry(*p, struct ceph_pool_perm, node); 1805 if (pool < perm->pool) 1806 p = &(*p)->rb_left; 1807 else if (pool > perm->pool) 1808 p = &(*p)->rb_right; 1809 else { 1810 int ret = ceph_compare_string(pool_ns, 1811 perm->pool_ns, 1812 perm->pool_ns_len); 1813 if (ret < 0) 1814 p = &(*p)->rb_left; 1815 else if (ret > 0) 1816 p = &(*p)->rb_right; 1817 else { 1818 have = perm->perm; 1819 break; 1820 } 1821 } 1822 } 1823 up_read(&mdsc->pool_perm_rwsem); 1824 if (*p) 1825 goto out; 1826 1827 if (pool_ns) 1828 dout("__ceph_pool_perm_get pool %lld ns %.*s no perm cached\n", 1829 pool, (int)pool_ns->len, pool_ns->str); 1830 else 1831 dout("__ceph_pool_perm_get pool %lld no perm cached\n", pool); 1832 1833 down_write(&mdsc->pool_perm_rwsem); 1834 p = &mdsc->pool_perm_tree.rb_node; 1835 parent = NULL; 1836 while (*p) { 1837 parent = *p; 1838 perm = rb_entry(parent, struct ceph_pool_perm, node); 1839 if (pool < perm->pool) 1840 p = &(*p)->rb_left; 1841 else if (pool > perm->pool) 1842 p = &(*p)->rb_right; 1843 else { 1844 int ret = ceph_compare_string(pool_ns, 1845 perm->pool_ns, 1846 perm->pool_ns_len); 1847 if (ret < 0) 1848 p = &(*p)->rb_left; 1849 else if (ret > 0) 1850 p = &(*p)->rb_right; 1851 else { 1852 have = perm->perm; 1853 break; 1854 } 1855 } 1856 } 1857 if (*p) { 1858 up_write(&mdsc->pool_perm_rwsem); 1859 goto out; 1860 } 1861 1862 rd_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL, 1863 1, false, GFP_NOFS); 1864 if (!rd_req) { 1865 err = -ENOMEM; 1866 goto out_unlock; 1867 } 1868 1869 rd_req->r_flags = CEPH_OSD_FLAG_READ; 1870 osd_req_op_init(rd_req, 0, CEPH_OSD_OP_STAT, 0); 1871 rd_req->r_base_oloc.pool = pool; 1872 if (pool_ns) 1873 rd_req->r_base_oloc.pool_ns = ceph_get_string(pool_ns); 1874 ceph_oid_printf(&rd_req->r_base_oid, "%llx.00000000", ci->i_vino.ino); 1875 1876 err = ceph_osdc_alloc_messages(rd_req, GFP_NOFS); 1877 if (err) 1878 goto out_unlock; 1879 1880 wr_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL, 1881 1, false, GFP_NOFS); 1882 if (!wr_req) { 1883 err = -ENOMEM; 1884 goto out_unlock; 1885 } 1886 1887 wr_req->r_flags = CEPH_OSD_FLAG_WRITE; 1888 osd_req_op_init(wr_req, 0, CEPH_OSD_OP_CREATE, CEPH_OSD_OP_FLAG_EXCL); 1889 ceph_oloc_copy(&wr_req->r_base_oloc, &rd_req->r_base_oloc); 1890 ceph_oid_copy(&wr_req->r_base_oid, &rd_req->r_base_oid); 1891 1892 err = ceph_osdc_alloc_messages(wr_req, GFP_NOFS); 1893 if (err) 1894 goto out_unlock; 1895 1896 /* one page should be large enough for STAT data */ 1897 pages = ceph_alloc_page_vector(1, GFP_KERNEL); 1898 if (IS_ERR(pages)) { 1899 err = PTR_ERR(pages); 1900 goto out_unlock; 1901 } 1902 1903 osd_req_op_raw_data_in_pages(rd_req, 0, pages, PAGE_SIZE, 1904 0, false, true); 1905 err = ceph_osdc_start_request(&fsc->client->osdc, rd_req, false); 1906 1907 wr_req->r_mtime = ci->vfs_inode.i_mtime; 1908 wr_req->r_abort_on_full = true; 1909 err2 = ceph_osdc_start_request(&fsc->client->osdc, wr_req, false); 1910 1911 if (!err) 1912 err = ceph_osdc_wait_request(&fsc->client->osdc, rd_req); 1913 if (!err2) 1914 err2 = ceph_osdc_wait_request(&fsc->client->osdc, wr_req); 1915 1916 if (err >= 0 || err == -ENOENT) 1917 have |= POOL_READ; 1918 else if (err != -EPERM) 1919 goto out_unlock; 1920 1921 if (err2 == 0 || err2 == -EEXIST) 1922 have |= POOL_WRITE; 1923 else if (err2 != -EPERM) { 1924 err = err2; 1925 goto out_unlock; 1926 } 1927 1928 pool_ns_len = pool_ns ? pool_ns->len : 0; 1929 perm = kmalloc(sizeof(*perm) + pool_ns_len + 1, GFP_NOFS); 1930 if (!perm) { 1931 err = -ENOMEM; 1932 goto out_unlock; 1933 } 1934 1935 perm->pool = pool; 1936 perm->perm = have; 1937 perm->pool_ns_len = pool_ns_len; 1938 if (pool_ns_len > 0) 1939 memcpy(perm->pool_ns, pool_ns->str, pool_ns_len); 1940 perm->pool_ns[pool_ns_len] = 0; 1941 1942 rb_link_node(&perm->node, parent, p); 1943 rb_insert_color(&perm->node, &mdsc->pool_perm_tree); 1944 err = 0; 1945 out_unlock: 1946 up_write(&mdsc->pool_perm_rwsem); 1947 1948 ceph_osdc_put_request(rd_req); 1949 ceph_osdc_put_request(wr_req); 1950 out: 1951 if (!err) 1952 err = have; 1953 if (pool_ns) 1954 dout("__ceph_pool_perm_get pool %lld ns %.*s result = %d\n", 1955 pool, (int)pool_ns->len, pool_ns->str, err); 1956 else 1957 dout("__ceph_pool_perm_get pool %lld result = %d\n", pool, err); 1958 return err; 1959 } 1960 1961 int ceph_pool_perm_check(struct ceph_inode_info *ci, int need) 1962 { 1963 s64 pool; 1964 struct ceph_string *pool_ns; 1965 int ret, flags; 1966 1967 if (ci->i_vino.snap != CEPH_NOSNAP) { 1968 /* 1969 * Pool permission check needs to write to the first object. 1970 * But for snapshot, head of the first object may have alread 1971 * been deleted. Skip check to avoid creating orphan object. 1972 */ 1973 return 0; 1974 } 1975 1976 if (ceph_test_mount_opt(ceph_inode_to_client(&ci->vfs_inode), 1977 NOPOOLPERM)) 1978 return 0; 1979 1980 spin_lock(&ci->i_ceph_lock); 1981 flags = ci->i_ceph_flags; 1982 pool = ci->i_layout.pool_id; 1983 spin_unlock(&ci->i_ceph_lock); 1984 check: 1985 if (flags & CEPH_I_POOL_PERM) { 1986 if ((need & CEPH_CAP_FILE_RD) && !(flags & CEPH_I_POOL_RD)) { 1987 dout("ceph_pool_perm_check pool %lld no read perm\n", 1988 pool); 1989 return -EPERM; 1990 } 1991 if ((need & CEPH_CAP_FILE_WR) && !(flags & CEPH_I_POOL_WR)) { 1992 dout("ceph_pool_perm_check pool %lld no write perm\n", 1993 pool); 1994 return -EPERM; 1995 } 1996 return 0; 1997 } 1998 1999 pool_ns = ceph_try_get_string(ci->i_layout.pool_ns); 2000 ret = __ceph_pool_perm_get(ci, pool, pool_ns); 2001 ceph_put_string(pool_ns); 2002 if (ret < 0) 2003 return ret; 2004 2005 flags = CEPH_I_POOL_PERM; 2006 if (ret & POOL_READ) 2007 flags |= CEPH_I_POOL_RD; 2008 if (ret & POOL_WRITE) 2009 flags |= CEPH_I_POOL_WR; 2010 2011 spin_lock(&ci->i_ceph_lock); 2012 if (pool == ci->i_layout.pool_id && 2013 pool_ns == rcu_dereference_raw(ci->i_layout.pool_ns)) { 2014 ci->i_ceph_flags |= flags; 2015 } else { 2016 pool = ci->i_layout.pool_id; 2017 flags = ci->i_ceph_flags; 2018 } 2019 spin_unlock(&ci->i_ceph_lock); 2020 goto check; 2021 } 2022 2023 void ceph_pool_perm_destroy(struct ceph_mds_client *mdsc) 2024 { 2025 struct ceph_pool_perm *perm; 2026 struct rb_node *n; 2027 2028 while (!RB_EMPTY_ROOT(&mdsc->pool_perm_tree)) { 2029 n = rb_first(&mdsc->pool_perm_tree); 2030 perm = rb_entry(n, struct ceph_pool_perm, node); 2031 rb_erase(n, &mdsc->pool_perm_tree); 2032 kfree(perm); 2033 } 2034 } 2035