1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/ceph/ceph_debug.h> 3 4 #include <linux/backing-dev.h> 5 #include <linux/fs.h> 6 #include <linux/mm.h> 7 #include <linux/pagemap.h> 8 #include <linux/writeback.h> /* generic_writepages */ 9 #include <linux/slab.h> 10 #include <linux/pagevec.h> 11 #include <linux/task_io_accounting_ops.h> 12 #include <linux/signal.h> 13 14 #include "super.h" 15 #include "mds_client.h" 16 #include "cache.h" 17 #include <linux/ceph/osd_client.h> 18 19 /* 20 * Ceph address space ops. 21 * 22 * There are a few funny things going on here. 23 * 24 * The page->private field is used to reference a struct 25 * ceph_snap_context for _every_ dirty page. This indicates which 26 * snapshot the page was logically dirtied in, and thus which snap 27 * context needs to be associated with the osd write during writeback. 28 * 29 * Similarly, struct ceph_inode_info maintains a set of counters to 30 * count dirty pages on the inode. In the absence of snapshots, 31 * i_wrbuffer_ref == i_wrbuffer_ref_head == the dirty page count. 32 * 33 * When a snapshot is taken (that is, when the client receives 34 * notification that a snapshot was taken), each inode with caps and 35 * with dirty pages (dirty pages implies there is a cap) gets a new 36 * ceph_cap_snap in the i_cap_snaps list (which is sorted in ascending 37 * order, new snaps go to the tail). The i_wrbuffer_ref_head count is 38 * moved to capsnap->dirty. (Unless a sync write is currently in 39 * progress. In that case, the capsnap is said to be "pending", new 40 * writes cannot start, and the capsnap isn't "finalized" until the 41 * write completes (or fails) and a final size/mtime for the inode for 42 * that snap can be settled upon.) i_wrbuffer_ref_head is reset to 0. 43 * 44 * On writeback, we must submit writes to the osd IN SNAP ORDER. So, 45 * we look for the first capsnap in i_cap_snaps and write out pages in 46 * that snap context _only_. Then we move on to the next capsnap, 47 * eventually reaching the "live" or "head" context (i.e., pages that 48 * are not yet snapped) and are writing the most recently dirtied 49 * pages. 50 * 51 * Invalidate and so forth must take care to ensure the dirty page 52 * accounting is preserved. 53 */ 54 55 #define CONGESTION_ON_THRESH(congestion_kb) (congestion_kb >> (PAGE_SHIFT-10)) 56 #define CONGESTION_OFF_THRESH(congestion_kb) \ 57 (CONGESTION_ON_THRESH(congestion_kb) - \ 58 (CONGESTION_ON_THRESH(congestion_kb) >> 2)) 59 60 static inline struct ceph_snap_context *page_snap_context(struct page *page) 61 { 62 if (PagePrivate(page)) 63 return (void *)page->private; 64 return NULL; 65 } 66 67 /* 68 * Dirty a page. Optimistically adjust accounting, on the assumption 69 * that we won't race with invalidate. If we do, readjust. 70 */ 71 static int ceph_set_page_dirty(struct page *page) 72 { 73 struct address_space *mapping = page->mapping; 74 struct inode *inode; 75 struct ceph_inode_info *ci; 76 struct ceph_snap_context *snapc; 77 int ret; 78 79 if (unlikely(!mapping)) 80 return !TestSetPageDirty(page); 81 82 if (PageDirty(page)) { 83 dout("%p set_page_dirty %p idx %lu -- already dirty\n", 84 mapping->host, page, page->index); 85 BUG_ON(!PagePrivate(page)); 86 return 0; 87 } 88 89 inode = mapping->host; 90 ci = ceph_inode(inode); 91 92 /* dirty the head */ 93 spin_lock(&ci->i_ceph_lock); 94 BUG_ON(ci->i_wr_ref == 0); // caller should hold Fw reference 95 if (__ceph_have_pending_cap_snap(ci)) { 96 struct ceph_cap_snap *capsnap = 97 list_last_entry(&ci->i_cap_snaps, 98 struct ceph_cap_snap, 99 ci_item); 100 snapc = ceph_get_snap_context(capsnap->context); 101 capsnap->dirty_pages++; 102 } else { 103 BUG_ON(!ci->i_head_snapc); 104 snapc = ceph_get_snap_context(ci->i_head_snapc); 105 ++ci->i_wrbuffer_ref_head; 106 } 107 if (ci->i_wrbuffer_ref == 0) 108 ihold(inode); 109 ++ci->i_wrbuffer_ref; 110 dout("%p set_page_dirty %p idx %lu head %d/%d -> %d/%d " 111 "snapc %p seq %lld (%d snaps)\n", 112 mapping->host, page, page->index, 113 ci->i_wrbuffer_ref-1, ci->i_wrbuffer_ref_head-1, 114 ci->i_wrbuffer_ref, ci->i_wrbuffer_ref_head, 115 snapc, snapc->seq, snapc->num_snaps); 116 spin_unlock(&ci->i_ceph_lock); 117 118 /* 119 * Reference snap context in page->private. Also set 120 * PagePrivate so that we get invalidatepage callback. 121 */ 122 BUG_ON(PagePrivate(page)); 123 page->private = (unsigned long)snapc; 124 SetPagePrivate(page); 125 126 ret = __set_page_dirty_nobuffers(page); 127 WARN_ON(!PageLocked(page)); 128 WARN_ON(!page->mapping); 129 130 return ret; 131 } 132 133 /* 134 * If we are truncating the full page (i.e. offset == 0), adjust the 135 * dirty page counters appropriately. Only called if there is private 136 * data on the page. 137 */ 138 static void ceph_invalidatepage(struct page *page, unsigned int offset, 139 unsigned int length) 140 { 141 struct inode *inode; 142 struct ceph_inode_info *ci; 143 struct ceph_snap_context *snapc = page_snap_context(page); 144 145 inode = page->mapping->host; 146 ci = ceph_inode(inode); 147 148 if (offset != 0 || length != PAGE_SIZE) { 149 dout("%p invalidatepage %p idx %lu partial dirty page %u~%u\n", 150 inode, page, page->index, offset, length); 151 return; 152 } 153 154 ceph_invalidate_fscache_page(inode, page); 155 156 WARN_ON(!PageLocked(page)); 157 if (!PagePrivate(page)) 158 return; 159 160 ClearPageChecked(page); 161 162 dout("%p invalidatepage %p idx %lu full dirty page\n", 163 inode, page, page->index); 164 165 ceph_put_wrbuffer_cap_refs(ci, 1, snapc); 166 ceph_put_snap_context(snapc); 167 page->private = 0; 168 ClearPagePrivate(page); 169 } 170 171 static int ceph_releasepage(struct page *page, gfp_t g) 172 { 173 dout("%p releasepage %p idx %lu (%sdirty)\n", page->mapping->host, 174 page, page->index, PageDirty(page) ? "" : "not "); 175 176 /* Can we release the page from the cache? */ 177 if (!ceph_release_fscache_page(page, g)) 178 return 0; 179 180 return !PagePrivate(page); 181 } 182 183 /* 184 * read a single page, without unlocking it. 185 */ 186 static int ceph_do_readpage(struct file *filp, struct page *page) 187 { 188 struct inode *inode = file_inode(filp); 189 struct ceph_inode_info *ci = ceph_inode(inode); 190 struct ceph_osd_client *osdc = 191 &ceph_inode_to_client(inode)->client->osdc; 192 int err = 0; 193 u64 off = page_offset(page); 194 u64 len = PAGE_SIZE; 195 196 if (off >= i_size_read(inode)) { 197 zero_user_segment(page, 0, PAGE_SIZE); 198 SetPageUptodate(page); 199 return 0; 200 } 201 202 if (ci->i_inline_version != CEPH_INLINE_NONE) { 203 /* 204 * Uptodate inline data should have been added 205 * into page cache while getting Fcr caps. 206 */ 207 if (off == 0) 208 return -EINVAL; 209 zero_user_segment(page, 0, PAGE_SIZE); 210 SetPageUptodate(page); 211 return 0; 212 } 213 214 err = ceph_readpage_from_fscache(inode, page); 215 if (err == 0) 216 return -EINPROGRESS; 217 218 dout("readpage inode %p file %p page %p index %lu\n", 219 inode, filp, page, page->index); 220 err = ceph_osdc_readpages(osdc, ceph_vino(inode), &ci->i_layout, 221 off, &len, 222 ci->i_truncate_seq, ci->i_truncate_size, 223 &page, 1, 0); 224 if (err == -ENOENT) 225 err = 0; 226 if (err < 0) { 227 SetPageError(page); 228 ceph_fscache_readpage_cancel(inode, page); 229 goto out; 230 } 231 if (err < PAGE_SIZE) 232 /* zero fill remainder of page */ 233 zero_user_segment(page, err, PAGE_SIZE); 234 else 235 flush_dcache_page(page); 236 237 SetPageUptodate(page); 238 ceph_readpage_to_fscache(inode, page); 239 240 out: 241 return err < 0 ? err : 0; 242 } 243 244 static int ceph_readpage(struct file *filp, struct page *page) 245 { 246 int r = ceph_do_readpage(filp, page); 247 if (r != -EINPROGRESS) 248 unlock_page(page); 249 else 250 r = 0; 251 return r; 252 } 253 254 /* 255 * Finish an async read(ahead) op. 256 */ 257 static void finish_read(struct ceph_osd_request *req) 258 { 259 struct inode *inode = req->r_inode; 260 struct ceph_osd_data *osd_data; 261 int rc = req->r_result <= 0 ? req->r_result : 0; 262 int bytes = req->r_result >= 0 ? req->r_result : 0; 263 int num_pages; 264 int i; 265 266 dout("finish_read %p req %p rc %d bytes %d\n", inode, req, rc, bytes); 267 268 /* unlock all pages, zeroing any data we didn't read */ 269 osd_data = osd_req_op_extent_osd_data(req, 0); 270 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES); 271 num_pages = calc_pages_for((u64)osd_data->alignment, 272 (u64)osd_data->length); 273 for (i = 0; i < num_pages; i++) { 274 struct page *page = osd_data->pages[i]; 275 276 if (rc < 0 && rc != -ENOENT) { 277 ceph_fscache_readpage_cancel(inode, page); 278 goto unlock; 279 } 280 if (bytes < (int)PAGE_SIZE) { 281 /* zero (remainder of) page */ 282 int s = bytes < 0 ? 0 : bytes; 283 zero_user_segment(page, s, PAGE_SIZE); 284 } 285 dout("finish_read %p uptodate %p idx %lu\n", inode, page, 286 page->index); 287 flush_dcache_page(page); 288 SetPageUptodate(page); 289 ceph_readpage_to_fscache(inode, page); 290 unlock: 291 unlock_page(page); 292 put_page(page); 293 bytes -= PAGE_SIZE; 294 } 295 kfree(osd_data->pages); 296 } 297 298 /* 299 * start an async read(ahead) operation. return nr_pages we submitted 300 * a read for on success, or negative error code. 301 */ 302 static int start_read(struct inode *inode, struct list_head *page_list, int max) 303 { 304 struct ceph_osd_client *osdc = 305 &ceph_inode_to_client(inode)->client->osdc; 306 struct ceph_inode_info *ci = ceph_inode(inode); 307 struct page *page = list_entry(page_list->prev, struct page, lru); 308 struct ceph_vino vino; 309 struct ceph_osd_request *req; 310 u64 off; 311 u64 len; 312 int i; 313 struct page **pages; 314 pgoff_t next_index; 315 int nr_pages = 0; 316 int got = 0; 317 int ret = 0; 318 319 if (!current->journal_info) { 320 /* caller of readpages does not hold buffer and read caps 321 * (fadvise, madvise and readahead cases) */ 322 int want = CEPH_CAP_FILE_CACHE; 323 ret = ceph_try_get_caps(ci, CEPH_CAP_FILE_RD, want, &got); 324 if (ret < 0) { 325 dout("start_read %p, error getting cap\n", inode); 326 } else if (!(got & want)) { 327 dout("start_read %p, no cache cap\n", inode); 328 ret = 0; 329 } 330 if (ret <= 0) { 331 if (got) 332 ceph_put_cap_refs(ci, got); 333 while (!list_empty(page_list)) { 334 page = list_entry(page_list->prev, 335 struct page, lru); 336 list_del(&page->lru); 337 put_page(page); 338 } 339 return ret; 340 } 341 } 342 343 off = (u64) page_offset(page); 344 345 /* count pages */ 346 next_index = page->index; 347 list_for_each_entry_reverse(page, page_list, lru) { 348 if (page->index != next_index) 349 break; 350 nr_pages++; 351 next_index++; 352 if (max && nr_pages == max) 353 break; 354 } 355 len = nr_pages << PAGE_SHIFT; 356 dout("start_read %p nr_pages %d is %lld~%lld\n", inode, nr_pages, 357 off, len); 358 vino = ceph_vino(inode); 359 req = ceph_osdc_new_request(osdc, &ci->i_layout, vino, off, &len, 360 0, 1, CEPH_OSD_OP_READ, 361 CEPH_OSD_FLAG_READ, NULL, 362 ci->i_truncate_seq, ci->i_truncate_size, 363 false); 364 if (IS_ERR(req)) { 365 ret = PTR_ERR(req); 366 goto out; 367 } 368 369 /* build page vector */ 370 nr_pages = calc_pages_for(0, len); 371 pages = kmalloc(sizeof(*pages) * nr_pages, GFP_KERNEL); 372 if (!pages) { 373 ret = -ENOMEM; 374 goto out_put; 375 } 376 for (i = 0; i < nr_pages; ++i) { 377 page = list_entry(page_list->prev, struct page, lru); 378 BUG_ON(PageLocked(page)); 379 list_del(&page->lru); 380 381 dout("start_read %p adding %p idx %lu\n", inode, page, 382 page->index); 383 if (add_to_page_cache_lru(page, &inode->i_data, page->index, 384 GFP_KERNEL)) { 385 ceph_fscache_uncache_page(inode, page); 386 put_page(page); 387 dout("start_read %p add_to_page_cache failed %p\n", 388 inode, page); 389 nr_pages = i; 390 if (nr_pages > 0) { 391 len = nr_pages << PAGE_SHIFT; 392 osd_req_op_extent_update(req, 0, len); 393 break; 394 } 395 goto out_pages; 396 } 397 pages[i] = page; 398 } 399 osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0, false, false); 400 req->r_callback = finish_read; 401 req->r_inode = inode; 402 403 dout("start_read %p starting %p %lld~%lld\n", inode, req, off, len); 404 ret = ceph_osdc_start_request(osdc, req, false); 405 if (ret < 0) 406 goto out_pages; 407 ceph_osdc_put_request(req); 408 409 /* After adding locked pages to page cache, the inode holds cache cap. 410 * So we can drop our cap refs. */ 411 if (got) 412 ceph_put_cap_refs(ci, got); 413 414 return nr_pages; 415 416 out_pages: 417 for (i = 0; i < nr_pages; ++i) { 418 ceph_fscache_readpage_cancel(inode, pages[i]); 419 unlock_page(pages[i]); 420 } 421 ceph_put_page_vector(pages, nr_pages, false); 422 out_put: 423 ceph_osdc_put_request(req); 424 out: 425 if (got) 426 ceph_put_cap_refs(ci, got); 427 return ret; 428 } 429 430 431 /* 432 * Read multiple pages. Leave pages we don't read + unlock in page_list; 433 * the caller (VM) cleans them up. 434 */ 435 static int ceph_readpages(struct file *file, struct address_space *mapping, 436 struct list_head *page_list, unsigned nr_pages) 437 { 438 struct inode *inode = file_inode(file); 439 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 440 int rc = 0; 441 int max = 0; 442 443 if (ceph_inode(inode)->i_inline_version != CEPH_INLINE_NONE) 444 return -EINVAL; 445 446 rc = ceph_readpages_from_fscache(mapping->host, mapping, page_list, 447 &nr_pages); 448 449 if (rc == 0) 450 goto out; 451 452 max = fsc->mount_options->rsize >> PAGE_SHIFT; 453 dout("readpages %p file %p nr_pages %d max %d\n", 454 inode, file, nr_pages, max); 455 while (!list_empty(page_list)) { 456 rc = start_read(inode, page_list, max); 457 if (rc < 0) 458 goto out; 459 } 460 out: 461 ceph_fscache_readpages_cancel(inode, page_list); 462 463 dout("readpages %p file %p ret %d\n", inode, file, rc); 464 return rc; 465 } 466 467 struct ceph_writeback_ctl 468 { 469 loff_t i_size; 470 u64 truncate_size; 471 u32 truncate_seq; 472 bool size_stable; 473 bool head_snapc; 474 }; 475 476 /* 477 * Get ref for the oldest snapc for an inode with dirty data... that is, the 478 * only snap context we are allowed to write back. 479 */ 480 static struct ceph_snap_context * 481 get_oldest_context(struct inode *inode, struct ceph_writeback_ctl *ctl, 482 struct ceph_snap_context *page_snapc) 483 { 484 struct ceph_inode_info *ci = ceph_inode(inode); 485 struct ceph_snap_context *snapc = NULL; 486 struct ceph_cap_snap *capsnap = NULL; 487 488 spin_lock(&ci->i_ceph_lock); 489 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) { 490 dout(" cap_snap %p snapc %p has %d dirty pages\n", capsnap, 491 capsnap->context, capsnap->dirty_pages); 492 if (!capsnap->dirty_pages) 493 continue; 494 495 /* get i_size, truncate_{seq,size} for page_snapc? */ 496 if (snapc && capsnap->context != page_snapc) 497 continue; 498 499 if (ctl) { 500 if (capsnap->writing) { 501 ctl->i_size = i_size_read(inode); 502 ctl->size_stable = false; 503 } else { 504 ctl->i_size = capsnap->size; 505 ctl->size_stable = true; 506 } 507 ctl->truncate_size = capsnap->truncate_size; 508 ctl->truncate_seq = capsnap->truncate_seq; 509 ctl->head_snapc = false; 510 } 511 512 if (snapc) 513 break; 514 515 snapc = ceph_get_snap_context(capsnap->context); 516 if (!page_snapc || 517 page_snapc == snapc || 518 page_snapc->seq > snapc->seq) 519 break; 520 } 521 if (!snapc && ci->i_wrbuffer_ref_head) { 522 snapc = ceph_get_snap_context(ci->i_head_snapc); 523 dout(" head snapc %p has %d dirty pages\n", 524 snapc, ci->i_wrbuffer_ref_head); 525 if (ctl) { 526 ctl->i_size = i_size_read(inode); 527 ctl->truncate_size = ci->i_truncate_size; 528 ctl->truncate_seq = ci->i_truncate_seq; 529 ctl->size_stable = false; 530 ctl->head_snapc = true; 531 } 532 } 533 spin_unlock(&ci->i_ceph_lock); 534 return snapc; 535 } 536 537 static u64 get_writepages_data_length(struct inode *inode, 538 struct page *page, u64 start) 539 { 540 struct ceph_inode_info *ci = ceph_inode(inode); 541 struct ceph_snap_context *snapc = page_snap_context(page); 542 struct ceph_cap_snap *capsnap = NULL; 543 u64 end = i_size_read(inode); 544 545 if (snapc != ci->i_head_snapc) { 546 bool found = false; 547 spin_lock(&ci->i_ceph_lock); 548 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) { 549 if (capsnap->context == snapc) { 550 if (!capsnap->writing) 551 end = capsnap->size; 552 found = true; 553 break; 554 } 555 } 556 spin_unlock(&ci->i_ceph_lock); 557 WARN_ON(!found); 558 } 559 if (end > page_offset(page) + PAGE_SIZE) 560 end = page_offset(page) + PAGE_SIZE; 561 return end > start ? end - start : 0; 562 } 563 564 /* 565 * Write a single page, but leave the page locked. 566 * 567 * If we get a write error, set the page error bit, but still adjust the 568 * dirty page accounting (i.e., page is no longer dirty). 569 */ 570 static int writepage_nounlock(struct page *page, struct writeback_control *wbc) 571 { 572 struct inode *inode; 573 struct ceph_inode_info *ci; 574 struct ceph_fs_client *fsc; 575 struct ceph_snap_context *snapc, *oldest; 576 loff_t page_off = page_offset(page); 577 long writeback_stat; 578 int err, len = PAGE_SIZE; 579 struct ceph_writeback_ctl ceph_wbc; 580 581 dout("writepage %p idx %lu\n", page, page->index); 582 583 inode = page->mapping->host; 584 ci = ceph_inode(inode); 585 fsc = ceph_inode_to_client(inode); 586 587 /* verify this is a writeable snap context */ 588 snapc = page_snap_context(page); 589 if (!snapc) { 590 dout("writepage %p page %p not dirty?\n", inode, page); 591 return 0; 592 } 593 oldest = get_oldest_context(inode, &ceph_wbc, snapc); 594 if (snapc->seq > oldest->seq) { 595 dout("writepage %p page %p snapc %p not writeable - noop\n", 596 inode, page, snapc); 597 /* we should only noop if called by kswapd */ 598 WARN_ON(!(current->flags & PF_MEMALLOC)); 599 ceph_put_snap_context(oldest); 600 redirty_page_for_writepage(wbc, page); 601 return 0; 602 } 603 ceph_put_snap_context(oldest); 604 605 /* is this a partial page at end of file? */ 606 if (page_off >= ceph_wbc.i_size) { 607 dout("%p page eof %llu\n", page, ceph_wbc.i_size); 608 page->mapping->a_ops->invalidatepage(page, 0, PAGE_SIZE); 609 return 0; 610 } 611 612 if (ceph_wbc.i_size < page_off + len) 613 len = ceph_wbc.i_size - page_off; 614 615 dout("writepage %p page %p index %lu on %llu~%u snapc %p seq %lld\n", 616 inode, page, page->index, page_off, len, snapc, snapc->seq); 617 618 writeback_stat = atomic_long_inc_return(&fsc->writeback_count); 619 if (writeback_stat > 620 CONGESTION_ON_THRESH(fsc->mount_options->congestion_kb)) 621 set_bdi_congested(inode_to_bdi(inode), BLK_RW_ASYNC); 622 623 set_page_writeback(page); 624 err = ceph_osdc_writepages(&fsc->client->osdc, ceph_vino(inode), 625 &ci->i_layout, snapc, page_off, len, 626 ceph_wbc.truncate_seq, 627 ceph_wbc.truncate_size, 628 &inode->i_mtime, &page, 1); 629 if (err < 0) { 630 struct writeback_control tmp_wbc; 631 if (!wbc) 632 wbc = &tmp_wbc; 633 if (err == -ERESTARTSYS) { 634 /* killed by SIGKILL */ 635 dout("writepage interrupted page %p\n", page); 636 redirty_page_for_writepage(wbc, page); 637 end_page_writeback(page); 638 return err; 639 } 640 dout("writepage setting page/mapping error %d %p\n", 641 err, page); 642 SetPageError(page); 643 mapping_set_error(&inode->i_data, err); 644 wbc->pages_skipped++; 645 } else { 646 dout("writepage cleaned page %p\n", page); 647 err = 0; /* vfs expects us to return 0 */ 648 } 649 page->private = 0; 650 ClearPagePrivate(page); 651 end_page_writeback(page); 652 ceph_put_wrbuffer_cap_refs(ci, 1, snapc); 653 ceph_put_snap_context(snapc); /* page's reference */ 654 return err; 655 } 656 657 static int ceph_writepage(struct page *page, struct writeback_control *wbc) 658 { 659 int err; 660 struct inode *inode = page->mapping->host; 661 BUG_ON(!inode); 662 ihold(inode); 663 err = writepage_nounlock(page, wbc); 664 if (err == -ERESTARTSYS) { 665 /* direct memory reclaimer was killed by SIGKILL. return 0 666 * to prevent caller from setting mapping/page error */ 667 err = 0; 668 } 669 unlock_page(page); 670 iput(inode); 671 return err; 672 } 673 674 /* 675 * lame release_pages helper. release_pages() isn't exported to 676 * modules. 677 */ 678 static void ceph_release_pages(struct page **pages, int num) 679 { 680 struct pagevec pvec; 681 int i; 682 683 pagevec_init(&pvec, 0); 684 for (i = 0; i < num; i++) { 685 if (pagevec_add(&pvec, pages[i]) == 0) 686 pagevec_release(&pvec); 687 } 688 pagevec_release(&pvec); 689 } 690 691 /* 692 * async writeback completion handler. 693 * 694 * If we get an error, set the mapping error bit, but not the individual 695 * page error bits. 696 */ 697 static void writepages_finish(struct ceph_osd_request *req) 698 { 699 struct inode *inode = req->r_inode; 700 struct ceph_inode_info *ci = ceph_inode(inode); 701 struct ceph_osd_data *osd_data; 702 struct page *page; 703 int num_pages, total_pages = 0; 704 int i, j; 705 int rc = req->r_result; 706 struct ceph_snap_context *snapc = req->r_snapc; 707 struct address_space *mapping = inode->i_mapping; 708 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 709 bool remove_page; 710 711 dout("writepages_finish %p rc %d\n", inode, rc); 712 if (rc < 0) { 713 mapping_set_error(mapping, rc); 714 ceph_set_error_write(ci); 715 } else { 716 ceph_clear_error_write(ci); 717 } 718 719 /* 720 * We lost the cache cap, need to truncate the page before 721 * it is unlocked, otherwise we'd truncate it later in the 722 * page truncation thread, possibly losing some data that 723 * raced its way in 724 */ 725 remove_page = !(ceph_caps_issued(ci) & 726 (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)); 727 728 /* clean all pages */ 729 for (i = 0; i < req->r_num_ops; i++) { 730 if (req->r_ops[i].op != CEPH_OSD_OP_WRITE) 731 break; 732 733 osd_data = osd_req_op_extent_osd_data(req, i); 734 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES); 735 num_pages = calc_pages_for((u64)osd_data->alignment, 736 (u64)osd_data->length); 737 total_pages += num_pages; 738 for (j = 0; j < num_pages; j++) { 739 page = osd_data->pages[j]; 740 BUG_ON(!page); 741 WARN_ON(!PageUptodate(page)); 742 743 if (atomic_long_dec_return(&fsc->writeback_count) < 744 CONGESTION_OFF_THRESH( 745 fsc->mount_options->congestion_kb)) 746 clear_bdi_congested(inode_to_bdi(inode), 747 BLK_RW_ASYNC); 748 749 ceph_put_snap_context(page_snap_context(page)); 750 page->private = 0; 751 ClearPagePrivate(page); 752 dout("unlocking %p\n", page); 753 end_page_writeback(page); 754 755 if (remove_page) 756 generic_error_remove_page(inode->i_mapping, 757 page); 758 759 unlock_page(page); 760 } 761 dout("writepages_finish %p wrote %llu bytes cleaned %d pages\n", 762 inode, osd_data->length, rc >= 0 ? num_pages : 0); 763 764 ceph_release_pages(osd_data->pages, num_pages); 765 } 766 767 ceph_put_wrbuffer_cap_refs(ci, total_pages, snapc); 768 769 osd_data = osd_req_op_extent_osd_data(req, 0); 770 if (osd_data->pages_from_pool) 771 mempool_free(osd_data->pages, 772 ceph_sb_to_client(inode->i_sb)->wb_pagevec_pool); 773 else 774 kfree(osd_data->pages); 775 ceph_osdc_put_request(req); 776 } 777 778 /* 779 * initiate async writeback 780 */ 781 static int ceph_writepages_start(struct address_space *mapping, 782 struct writeback_control *wbc) 783 { 784 struct inode *inode = mapping->host; 785 struct ceph_inode_info *ci = ceph_inode(inode); 786 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 787 struct ceph_vino vino = ceph_vino(inode); 788 pgoff_t index, start_index, end = -1; 789 struct ceph_snap_context *snapc = NULL, *last_snapc = NULL, *pgsnapc; 790 struct pagevec pvec; 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 bool should_loop, range_whole = false; 796 bool stop, done = false; 797 798 dout("writepages_start %p (mode=%s)\n", inode, 799 wbc->sync_mode == WB_SYNC_NONE ? "NONE" : 800 (wbc->sync_mode == WB_SYNC_ALL ? "ALL" : "HOLD")); 801 802 if (READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) { 803 if (ci->i_wrbuffer_ref > 0) { 804 pr_warn_ratelimited( 805 "writepage_start %p %lld forced umount\n", 806 inode, ceph_ino(inode)); 807 } 808 mapping_set_error(mapping, -EIO); 809 return -EIO; /* we're in a forced umount, don't write! */ 810 } 811 if (fsc->mount_options->wsize < wsize) 812 wsize = fsc->mount_options->wsize; 813 814 pagevec_init(&pvec, 0); 815 816 start_index = wbc->range_cyclic ? mapping->writeback_index : 0; 817 index = start_index; 818 819 retry: 820 /* find oldest snap context with dirty data */ 821 snapc = get_oldest_context(inode, &ceph_wbc, NULL); 822 if (!snapc) { 823 /* hmm, why does writepages get called when there 824 is no dirty data? */ 825 dout(" no snap context with dirty data?\n"); 826 goto out; 827 } 828 dout(" oldest snapc is %p seq %lld (%d snaps)\n", 829 snapc, snapc->seq, snapc->num_snaps); 830 831 should_loop = false; 832 if (ceph_wbc.head_snapc && snapc != last_snapc) { 833 /* where to start/end? */ 834 if (wbc->range_cyclic) { 835 index = start_index; 836 end = -1; 837 if (index > 0) 838 should_loop = true; 839 dout(" cyclic, start at %lu\n", index); 840 } else { 841 index = wbc->range_start >> PAGE_SHIFT; 842 end = wbc->range_end >> PAGE_SHIFT; 843 if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) 844 range_whole = true; 845 dout(" not cyclic, %lu to %lu\n", index, end); 846 } 847 } else if (!ceph_wbc.head_snapc) { 848 /* Do not respect wbc->range_{start,end}. Dirty pages 849 * in that range can be associated with newer snapc. 850 * They are not writeable until we write all dirty pages 851 * associated with 'snapc' get written */ 852 if (index > 0 || wbc->sync_mode != WB_SYNC_NONE) 853 should_loop = true; 854 dout(" non-head snapc, range whole\n"); 855 } 856 857 ceph_put_snap_context(last_snapc); 858 last_snapc = snapc; 859 860 stop = false; 861 while (!stop && index <= end) { 862 int num_ops = 0, op_idx; 863 unsigned i, pvec_pages, max_pages, locked_pages = 0; 864 struct page **pages = NULL, **data_pages; 865 mempool_t *pool = NULL; /* Becomes non-null if mempool used */ 866 struct page *page; 867 pgoff_t strip_unit_end = 0; 868 u64 offset = 0, len = 0; 869 870 max_pages = wsize >> PAGE_SHIFT; 871 872 get_more_pages: 873 pvec_pages = min_t(unsigned, PAGEVEC_SIZE, 874 max_pages - locked_pages); 875 pvec_pages = pagevec_lookup_range_tag(&pvec, mapping, &index, 876 end, PAGECACHE_TAG_DIRTY, 877 pvec_pages); 878 dout("pagevec_lookup_range_tag got %d\n", pvec_pages); 879 if (!pvec_pages && !locked_pages) 880 break; 881 for (i = 0; i < pvec_pages && locked_pages < max_pages; i++) { 882 page = pvec.pages[i]; 883 dout("? %p idx %lu\n", page, page->index); 884 if (locked_pages == 0) 885 lock_page(page); /* first page */ 886 else if (!trylock_page(page)) 887 break; 888 889 /* only dirty pages, or our accounting breaks */ 890 if (unlikely(!PageDirty(page)) || 891 unlikely(page->mapping != mapping)) { 892 dout("!dirty or !mapping %p\n", page); 893 unlock_page(page); 894 continue; 895 } 896 if (strip_unit_end && (page->index > strip_unit_end)) { 897 dout("end of strip unit %p\n", page); 898 unlock_page(page); 899 break; 900 } 901 if (page_offset(page) >= ceph_wbc.i_size) { 902 dout("%p page eof %llu\n", 903 page, ceph_wbc.i_size); 904 /* not done if range_cyclic */ 905 stop = true; 906 unlock_page(page); 907 break; 908 } 909 if (PageWriteback(page)) { 910 if (wbc->sync_mode == WB_SYNC_NONE) { 911 dout("%p under writeback\n", page); 912 unlock_page(page); 913 continue; 914 } 915 dout("waiting on writeback %p\n", page); 916 wait_on_page_writeback(page); 917 } 918 919 /* only if matching snap context */ 920 pgsnapc = page_snap_context(page); 921 if (pgsnapc != snapc) { 922 dout("page snapc %p %lld != oldest %p %lld\n", 923 pgsnapc, pgsnapc->seq, snapc, snapc->seq); 924 unlock_page(page); 925 continue; 926 } 927 928 if (!clear_page_dirty_for_io(page)) { 929 dout("%p !clear_page_dirty_for_io\n", page); 930 unlock_page(page); 931 continue; 932 } 933 934 /* 935 * We have something to write. If this is 936 * the first locked page this time through, 937 * calculate max possinle write size and 938 * allocate a page array 939 */ 940 if (locked_pages == 0) { 941 u64 objnum; 942 u64 objoff; 943 944 /* prepare async write request */ 945 offset = (u64)page_offset(page); 946 len = wsize; 947 948 rc = ceph_calc_file_object_mapping(&ci->i_layout, 949 offset, len, 950 &objnum, &objoff, 951 &len); 952 if (rc < 0) { 953 unlock_page(page); 954 break; 955 } 956 957 num_ops = 1; 958 strip_unit_end = page->index + 959 ((len - 1) >> PAGE_SHIFT); 960 961 BUG_ON(pages); 962 max_pages = calc_pages_for(0, (u64)len); 963 pages = kmalloc(max_pages * sizeof (*pages), 964 GFP_NOFS); 965 if (!pages) { 966 pool = fsc->wb_pagevec_pool; 967 pages = mempool_alloc(pool, GFP_NOFS); 968 BUG_ON(!pages); 969 } 970 971 len = 0; 972 } else if (page->index != 973 (offset + len) >> PAGE_SHIFT) { 974 if (num_ops >= (pool ? CEPH_OSD_SLAB_OPS : 975 CEPH_OSD_MAX_OPS)) { 976 redirty_page_for_writepage(wbc, page); 977 unlock_page(page); 978 break; 979 } 980 981 num_ops++; 982 offset = (u64)page_offset(page); 983 len = 0; 984 } 985 986 /* note position of first page in pvec */ 987 dout("%p will write page %p idx %lu\n", 988 inode, page, page->index); 989 990 if (atomic_long_inc_return(&fsc->writeback_count) > 991 CONGESTION_ON_THRESH( 992 fsc->mount_options->congestion_kb)) { 993 set_bdi_congested(inode_to_bdi(inode), 994 BLK_RW_ASYNC); 995 } 996 997 998 pages[locked_pages++] = page; 999 pvec.pages[i] = NULL; 1000 1001 len += PAGE_SIZE; 1002 } 1003 1004 /* did we get anything? */ 1005 if (!locked_pages) 1006 goto release_pvec_pages; 1007 if (i) { 1008 unsigned j, n = 0; 1009 /* shift unused page to beginning of pvec */ 1010 for (j = 0; j < pvec_pages; j++) { 1011 if (!pvec.pages[j]) 1012 continue; 1013 if (n < j) 1014 pvec.pages[n] = pvec.pages[j]; 1015 n++; 1016 } 1017 pvec.nr = n; 1018 1019 if (pvec_pages && i == pvec_pages && 1020 locked_pages < max_pages) { 1021 dout("reached end pvec, trying for more\n"); 1022 pagevec_release(&pvec); 1023 goto get_more_pages; 1024 } 1025 } 1026 1027 new_request: 1028 offset = page_offset(pages[0]); 1029 len = wsize; 1030 1031 req = ceph_osdc_new_request(&fsc->client->osdc, 1032 &ci->i_layout, vino, 1033 offset, &len, 0, num_ops, 1034 CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE, 1035 snapc, ceph_wbc.truncate_seq, 1036 ceph_wbc.truncate_size, false); 1037 if (IS_ERR(req)) { 1038 req = ceph_osdc_new_request(&fsc->client->osdc, 1039 &ci->i_layout, vino, 1040 offset, &len, 0, 1041 min(num_ops, 1042 CEPH_OSD_SLAB_OPS), 1043 CEPH_OSD_OP_WRITE, 1044 CEPH_OSD_FLAG_WRITE, 1045 snapc, ceph_wbc.truncate_seq, 1046 ceph_wbc.truncate_size, true); 1047 BUG_ON(IS_ERR(req)); 1048 } 1049 BUG_ON(len < page_offset(pages[locked_pages - 1]) + 1050 PAGE_SIZE - offset); 1051 1052 req->r_callback = writepages_finish; 1053 req->r_inode = inode; 1054 1055 /* Format the osd request message and submit the write */ 1056 len = 0; 1057 data_pages = pages; 1058 op_idx = 0; 1059 for (i = 0; i < locked_pages; i++) { 1060 u64 cur_offset = page_offset(pages[i]); 1061 if (offset + len != cur_offset) { 1062 if (op_idx + 1 == req->r_num_ops) 1063 break; 1064 osd_req_op_extent_dup_last(req, op_idx, 1065 cur_offset - offset); 1066 dout("writepages got pages at %llu~%llu\n", 1067 offset, len); 1068 osd_req_op_extent_osd_data_pages(req, op_idx, 1069 data_pages, len, 0, 1070 !!pool, false); 1071 osd_req_op_extent_update(req, op_idx, len); 1072 1073 len = 0; 1074 offset = cur_offset; 1075 data_pages = pages + i; 1076 op_idx++; 1077 } 1078 1079 set_page_writeback(pages[i]); 1080 len += PAGE_SIZE; 1081 } 1082 1083 if (ceph_wbc.size_stable) { 1084 len = min(len, ceph_wbc.i_size - offset); 1085 } else if (i == locked_pages) { 1086 /* writepages_finish() clears writeback pages 1087 * according to the data length, so make sure 1088 * data length covers all locked pages */ 1089 u64 min_len = len + 1 - PAGE_SIZE; 1090 len = get_writepages_data_length(inode, pages[i - 1], 1091 offset); 1092 len = max(len, min_len); 1093 } 1094 dout("writepages got pages at %llu~%llu\n", offset, len); 1095 1096 osd_req_op_extent_osd_data_pages(req, op_idx, data_pages, len, 1097 0, !!pool, false); 1098 osd_req_op_extent_update(req, op_idx, len); 1099 1100 BUG_ON(op_idx + 1 != req->r_num_ops); 1101 1102 pool = NULL; 1103 if (i < locked_pages) { 1104 BUG_ON(num_ops <= req->r_num_ops); 1105 num_ops -= req->r_num_ops; 1106 locked_pages -= i; 1107 1108 /* allocate new pages array for next request */ 1109 data_pages = pages; 1110 pages = kmalloc(locked_pages * sizeof (*pages), 1111 GFP_NOFS); 1112 if (!pages) { 1113 pool = fsc->wb_pagevec_pool; 1114 pages = mempool_alloc(pool, GFP_NOFS); 1115 BUG_ON(!pages); 1116 } 1117 memcpy(pages, data_pages + i, 1118 locked_pages * sizeof(*pages)); 1119 memset(data_pages + i, 0, 1120 locked_pages * sizeof(*pages)); 1121 } else { 1122 BUG_ON(num_ops != req->r_num_ops); 1123 index = pages[i - 1]->index + 1; 1124 /* request message now owns the pages array */ 1125 pages = NULL; 1126 } 1127 1128 req->r_mtime = inode->i_mtime; 1129 rc = ceph_osdc_start_request(&fsc->client->osdc, req, true); 1130 BUG_ON(rc); 1131 req = NULL; 1132 1133 wbc->nr_to_write -= i; 1134 if (pages) 1135 goto new_request; 1136 1137 /* 1138 * We stop writing back only if we are not doing 1139 * integrity sync. In case of integrity sync we have to 1140 * keep going until we have written all the pages 1141 * we tagged for writeback prior to entering this loop. 1142 */ 1143 if (wbc->nr_to_write <= 0 && wbc->sync_mode == WB_SYNC_NONE) 1144 done = stop = true; 1145 1146 release_pvec_pages: 1147 dout("pagevec_release on %d pages (%p)\n", (int)pvec.nr, 1148 pvec.nr ? pvec.pages[0] : NULL); 1149 pagevec_release(&pvec); 1150 } 1151 1152 if (should_loop && !done) { 1153 /* more to do; loop back to beginning of file */ 1154 dout("writepages looping back to beginning of file\n"); 1155 end = start_index - 1; /* OK even when start_index == 0 */ 1156 1157 /* to write dirty pages associated with next snapc, 1158 * we need to wait until current writes complete */ 1159 if (wbc->sync_mode != WB_SYNC_NONE && 1160 start_index == 0 && /* all dirty pages were checked */ 1161 !ceph_wbc.head_snapc) { 1162 struct page *page; 1163 unsigned i, nr; 1164 index = 0; 1165 while ((index <= end) && 1166 (nr = pagevec_lookup_tag(&pvec, mapping, &index, 1167 PAGECACHE_TAG_WRITEBACK, 1168 PAGEVEC_SIZE))) { 1169 for (i = 0; i < nr; i++) { 1170 page = pvec.pages[i]; 1171 if (page_snap_context(page) != snapc) 1172 continue; 1173 wait_on_page_writeback(page); 1174 } 1175 pagevec_release(&pvec); 1176 cond_resched(); 1177 } 1178 } 1179 1180 start_index = 0; 1181 index = 0; 1182 goto retry; 1183 } 1184 1185 if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) 1186 mapping->writeback_index = index; 1187 1188 out: 1189 ceph_osdc_put_request(req); 1190 ceph_put_snap_context(last_snapc); 1191 dout("writepages dend - startone, rc = %d\n", rc); 1192 return rc; 1193 } 1194 1195 1196 1197 /* 1198 * See if a given @snapc is either writeable, or already written. 1199 */ 1200 static int context_is_writeable_or_written(struct inode *inode, 1201 struct ceph_snap_context *snapc) 1202 { 1203 struct ceph_snap_context *oldest = get_oldest_context(inode, NULL, NULL); 1204 int ret = !oldest || snapc->seq <= oldest->seq; 1205 1206 ceph_put_snap_context(oldest); 1207 return ret; 1208 } 1209 1210 /* 1211 * We are only allowed to write into/dirty the page if the page is 1212 * clean, or already dirty within the same snap context. 1213 * 1214 * called with page locked. 1215 * return success with page locked, 1216 * or any failure (incl -EAGAIN) with page unlocked. 1217 */ 1218 static int ceph_update_writeable_page(struct file *file, 1219 loff_t pos, unsigned len, 1220 struct page *page) 1221 { 1222 struct inode *inode = file_inode(file); 1223 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 1224 struct ceph_inode_info *ci = ceph_inode(inode); 1225 loff_t page_off = pos & PAGE_MASK; 1226 int pos_in_page = pos & ~PAGE_MASK; 1227 int end_in_page = pos_in_page + len; 1228 loff_t i_size; 1229 int r; 1230 struct ceph_snap_context *snapc, *oldest; 1231 1232 if (READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) { 1233 dout(" page %p forced umount\n", page); 1234 unlock_page(page); 1235 return -EIO; 1236 } 1237 1238 retry_locked: 1239 /* writepages currently holds page lock, but if we change that later, */ 1240 wait_on_page_writeback(page); 1241 1242 snapc = page_snap_context(page); 1243 if (snapc && snapc != ci->i_head_snapc) { 1244 /* 1245 * this page is already dirty in another (older) snap 1246 * context! is it writeable now? 1247 */ 1248 oldest = get_oldest_context(inode, NULL, NULL); 1249 if (snapc->seq > oldest->seq) { 1250 ceph_put_snap_context(oldest); 1251 dout(" page %p snapc %p not current or oldest\n", 1252 page, snapc); 1253 /* 1254 * queue for writeback, and wait for snapc to 1255 * be writeable or written 1256 */ 1257 snapc = ceph_get_snap_context(snapc); 1258 unlock_page(page); 1259 ceph_queue_writeback(inode); 1260 r = wait_event_killable(ci->i_cap_wq, 1261 context_is_writeable_or_written(inode, snapc)); 1262 ceph_put_snap_context(snapc); 1263 if (r == -ERESTARTSYS) 1264 return r; 1265 return -EAGAIN; 1266 } 1267 ceph_put_snap_context(oldest); 1268 1269 /* yay, writeable, do it now (without dropping page lock) */ 1270 dout(" page %p snapc %p not current, but oldest\n", 1271 page, snapc); 1272 if (!clear_page_dirty_for_io(page)) 1273 goto retry_locked; 1274 r = writepage_nounlock(page, NULL); 1275 if (r < 0) 1276 goto fail_unlock; 1277 goto retry_locked; 1278 } 1279 1280 if (PageUptodate(page)) { 1281 dout(" page %p already uptodate\n", page); 1282 return 0; 1283 } 1284 1285 /* full page? */ 1286 if (pos_in_page == 0 && len == PAGE_SIZE) 1287 return 0; 1288 1289 /* past end of file? */ 1290 i_size = i_size_read(inode); 1291 1292 if (page_off >= i_size || 1293 (pos_in_page == 0 && (pos+len) >= i_size && 1294 end_in_page - pos_in_page != PAGE_SIZE)) { 1295 dout(" zeroing %p 0 - %d and %d - %d\n", 1296 page, pos_in_page, end_in_page, (int)PAGE_SIZE); 1297 zero_user_segments(page, 1298 0, pos_in_page, 1299 end_in_page, PAGE_SIZE); 1300 return 0; 1301 } 1302 1303 /* we need to read it. */ 1304 r = ceph_do_readpage(file, page); 1305 if (r < 0) { 1306 if (r == -EINPROGRESS) 1307 return -EAGAIN; 1308 goto fail_unlock; 1309 } 1310 goto retry_locked; 1311 fail_unlock: 1312 unlock_page(page); 1313 return r; 1314 } 1315 1316 /* 1317 * We are only allowed to write into/dirty the page if the page is 1318 * clean, or already dirty within the same snap context. 1319 */ 1320 static int ceph_write_begin(struct file *file, struct address_space *mapping, 1321 loff_t pos, unsigned len, unsigned flags, 1322 struct page **pagep, void **fsdata) 1323 { 1324 struct inode *inode = file_inode(file); 1325 struct page *page; 1326 pgoff_t index = pos >> PAGE_SHIFT; 1327 int r; 1328 1329 do { 1330 /* get a page */ 1331 page = grab_cache_page_write_begin(mapping, index, 0); 1332 if (!page) 1333 return -ENOMEM; 1334 1335 dout("write_begin file %p inode %p page %p %d~%d\n", file, 1336 inode, page, (int)pos, (int)len); 1337 1338 r = ceph_update_writeable_page(file, pos, len, page); 1339 if (r < 0) 1340 put_page(page); 1341 else 1342 *pagep = page; 1343 } while (r == -EAGAIN); 1344 1345 return r; 1346 } 1347 1348 /* 1349 * we don't do anything in here that simple_write_end doesn't do 1350 * except adjust dirty page accounting 1351 */ 1352 static int ceph_write_end(struct file *file, struct address_space *mapping, 1353 loff_t pos, unsigned len, unsigned copied, 1354 struct page *page, void *fsdata) 1355 { 1356 struct inode *inode = file_inode(file); 1357 bool check_cap = false; 1358 1359 dout("write_end file %p inode %p page %p %d~%d (%d)\n", file, 1360 inode, page, (int)pos, (int)copied, (int)len); 1361 1362 /* zero the stale part of the page if we did a short copy */ 1363 if (!PageUptodate(page)) { 1364 if (copied < len) { 1365 copied = 0; 1366 goto out; 1367 } 1368 SetPageUptodate(page); 1369 } 1370 1371 /* did file size increase? */ 1372 if (pos+copied > i_size_read(inode)) 1373 check_cap = ceph_inode_set_size(inode, pos+copied); 1374 1375 set_page_dirty(page); 1376 1377 out: 1378 unlock_page(page); 1379 put_page(page); 1380 1381 if (check_cap) 1382 ceph_check_caps(ceph_inode(inode), CHECK_CAPS_AUTHONLY, NULL); 1383 1384 return copied; 1385 } 1386 1387 /* 1388 * we set .direct_IO to indicate direct io is supported, but since we 1389 * intercept O_DIRECT reads and writes early, this function should 1390 * never get called. 1391 */ 1392 static ssize_t ceph_direct_io(struct kiocb *iocb, struct iov_iter *iter) 1393 { 1394 WARN_ON(1); 1395 return -EINVAL; 1396 } 1397 1398 const struct address_space_operations ceph_aops = { 1399 .readpage = ceph_readpage, 1400 .readpages = ceph_readpages, 1401 .writepage = ceph_writepage, 1402 .writepages = ceph_writepages_start, 1403 .write_begin = ceph_write_begin, 1404 .write_end = ceph_write_end, 1405 .set_page_dirty = ceph_set_page_dirty, 1406 .invalidatepage = ceph_invalidatepage, 1407 .releasepage = ceph_releasepage, 1408 .direct_IO = ceph_direct_io, 1409 }; 1410 1411 static void ceph_block_sigs(sigset_t *oldset) 1412 { 1413 sigset_t mask; 1414 siginitsetinv(&mask, sigmask(SIGKILL)); 1415 sigprocmask(SIG_BLOCK, &mask, oldset); 1416 } 1417 1418 static void ceph_restore_sigs(sigset_t *oldset) 1419 { 1420 sigprocmask(SIG_SETMASK, oldset, NULL); 1421 } 1422 1423 /* 1424 * vm ops 1425 */ 1426 static int ceph_filemap_fault(struct vm_fault *vmf) 1427 { 1428 struct vm_area_struct *vma = vmf->vma; 1429 struct inode *inode = file_inode(vma->vm_file); 1430 struct ceph_inode_info *ci = ceph_inode(inode); 1431 struct ceph_file_info *fi = vma->vm_file->private_data; 1432 struct page *pinned_page = NULL; 1433 loff_t off = vmf->pgoff << PAGE_SHIFT; 1434 int want, got, ret; 1435 sigset_t oldset; 1436 1437 ceph_block_sigs(&oldset); 1438 1439 dout("filemap_fault %p %llx.%llx %llu~%zd trying to get caps\n", 1440 inode, ceph_vinop(inode), off, (size_t)PAGE_SIZE); 1441 if (fi->fmode & CEPH_FILE_MODE_LAZY) 1442 want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO; 1443 else 1444 want = CEPH_CAP_FILE_CACHE; 1445 1446 got = 0; 1447 ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, -1, &got, &pinned_page); 1448 if (ret < 0) 1449 goto out_restore; 1450 1451 dout("filemap_fault %p %llu~%zd got cap refs on %s\n", 1452 inode, off, (size_t)PAGE_SIZE, ceph_cap_string(got)); 1453 1454 if ((got & (CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO)) || 1455 ci->i_inline_version == CEPH_INLINE_NONE) { 1456 current->journal_info = vma->vm_file; 1457 ret = filemap_fault(vmf); 1458 current->journal_info = NULL; 1459 } else 1460 ret = -EAGAIN; 1461 1462 dout("filemap_fault %p %llu~%zd dropping cap refs on %s ret %d\n", 1463 inode, off, (size_t)PAGE_SIZE, ceph_cap_string(got), ret); 1464 if (pinned_page) 1465 put_page(pinned_page); 1466 ceph_put_cap_refs(ci, got); 1467 1468 if (ret != -EAGAIN) 1469 goto out_restore; 1470 1471 /* read inline data */ 1472 if (off >= PAGE_SIZE) { 1473 /* does not support inline data > PAGE_SIZE */ 1474 ret = VM_FAULT_SIGBUS; 1475 } else { 1476 int ret1; 1477 struct address_space *mapping = inode->i_mapping; 1478 struct page *page = find_or_create_page(mapping, 0, 1479 mapping_gfp_constraint(mapping, 1480 ~__GFP_FS)); 1481 if (!page) { 1482 ret = VM_FAULT_OOM; 1483 goto out_inline; 1484 } 1485 ret1 = __ceph_do_getattr(inode, page, 1486 CEPH_STAT_CAP_INLINE_DATA, true); 1487 if (ret1 < 0 || off >= i_size_read(inode)) { 1488 unlock_page(page); 1489 put_page(page); 1490 if (ret1 < 0) 1491 ret = ret1; 1492 else 1493 ret = VM_FAULT_SIGBUS; 1494 goto out_inline; 1495 } 1496 if (ret1 < PAGE_SIZE) 1497 zero_user_segment(page, ret1, PAGE_SIZE); 1498 else 1499 flush_dcache_page(page); 1500 SetPageUptodate(page); 1501 vmf->page = page; 1502 ret = VM_FAULT_MAJOR | VM_FAULT_LOCKED; 1503 out_inline: 1504 dout("filemap_fault %p %llu~%zd read inline data ret %d\n", 1505 inode, off, (size_t)PAGE_SIZE, ret); 1506 } 1507 out_restore: 1508 ceph_restore_sigs(&oldset); 1509 if (ret < 0) 1510 ret = (ret == -ENOMEM) ? VM_FAULT_OOM : VM_FAULT_SIGBUS; 1511 1512 return ret; 1513 } 1514 1515 /* 1516 * Reuse write_begin here for simplicity. 1517 */ 1518 static int ceph_page_mkwrite(struct vm_fault *vmf) 1519 { 1520 struct vm_area_struct *vma = vmf->vma; 1521 struct inode *inode = file_inode(vma->vm_file); 1522 struct ceph_inode_info *ci = ceph_inode(inode); 1523 struct ceph_file_info *fi = vma->vm_file->private_data; 1524 struct ceph_cap_flush *prealloc_cf; 1525 struct page *page = vmf->page; 1526 loff_t off = page_offset(page); 1527 loff_t size = i_size_read(inode); 1528 size_t len; 1529 int want, got, ret; 1530 sigset_t oldset; 1531 1532 prealloc_cf = ceph_alloc_cap_flush(); 1533 if (!prealloc_cf) 1534 return VM_FAULT_OOM; 1535 1536 ceph_block_sigs(&oldset); 1537 1538 if (ci->i_inline_version != CEPH_INLINE_NONE) { 1539 struct page *locked_page = NULL; 1540 if (off == 0) { 1541 lock_page(page); 1542 locked_page = page; 1543 } 1544 ret = ceph_uninline_data(vma->vm_file, locked_page); 1545 if (locked_page) 1546 unlock_page(locked_page); 1547 if (ret < 0) 1548 goto out_free; 1549 } 1550 1551 if (off + PAGE_SIZE <= size) 1552 len = PAGE_SIZE; 1553 else 1554 len = size & ~PAGE_MASK; 1555 1556 dout("page_mkwrite %p %llx.%llx %llu~%zd getting caps i_size %llu\n", 1557 inode, ceph_vinop(inode), off, len, size); 1558 if (fi->fmode & CEPH_FILE_MODE_LAZY) 1559 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO; 1560 else 1561 want = CEPH_CAP_FILE_BUFFER; 1562 1563 got = 0; 1564 ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, off + len, 1565 &got, NULL); 1566 if (ret < 0) 1567 goto out_free; 1568 1569 dout("page_mkwrite %p %llu~%zd got cap refs on %s\n", 1570 inode, off, len, ceph_cap_string(got)); 1571 1572 /* Update time before taking page lock */ 1573 file_update_time(vma->vm_file); 1574 1575 do { 1576 lock_page(page); 1577 1578 if ((off > size) || (page->mapping != inode->i_mapping)) { 1579 unlock_page(page); 1580 ret = VM_FAULT_NOPAGE; 1581 break; 1582 } 1583 1584 ret = ceph_update_writeable_page(vma->vm_file, off, len, page); 1585 if (ret >= 0) { 1586 /* success. we'll keep the page locked. */ 1587 set_page_dirty(page); 1588 ret = VM_FAULT_LOCKED; 1589 } 1590 } while (ret == -EAGAIN); 1591 1592 if (ret == VM_FAULT_LOCKED || 1593 ci->i_inline_version != CEPH_INLINE_NONE) { 1594 int dirty; 1595 spin_lock(&ci->i_ceph_lock); 1596 ci->i_inline_version = CEPH_INLINE_NONE; 1597 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR, 1598 &prealloc_cf); 1599 spin_unlock(&ci->i_ceph_lock); 1600 if (dirty) 1601 __mark_inode_dirty(inode, dirty); 1602 } 1603 1604 dout("page_mkwrite %p %llu~%zd dropping cap refs on %s ret %d\n", 1605 inode, off, len, ceph_cap_string(got), ret); 1606 ceph_put_cap_refs(ci, got); 1607 out_free: 1608 ceph_restore_sigs(&oldset); 1609 ceph_free_cap_flush(prealloc_cf); 1610 if (ret < 0) 1611 ret = (ret == -ENOMEM) ? VM_FAULT_OOM : VM_FAULT_SIGBUS; 1612 return ret; 1613 } 1614 1615 void ceph_fill_inline_data(struct inode *inode, struct page *locked_page, 1616 char *data, size_t len) 1617 { 1618 struct address_space *mapping = inode->i_mapping; 1619 struct page *page; 1620 1621 if (locked_page) { 1622 page = locked_page; 1623 } else { 1624 if (i_size_read(inode) == 0) 1625 return; 1626 page = find_or_create_page(mapping, 0, 1627 mapping_gfp_constraint(mapping, 1628 ~__GFP_FS)); 1629 if (!page) 1630 return; 1631 if (PageUptodate(page)) { 1632 unlock_page(page); 1633 put_page(page); 1634 return; 1635 } 1636 } 1637 1638 dout("fill_inline_data %p %llx.%llx len %zu locked_page %p\n", 1639 inode, ceph_vinop(inode), len, locked_page); 1640 1641 if (len > 0) { 1642 void *kaddr = kmap_atomic(page); 1643 memcpy(kaddr, data, len); 1644 kunmap_atomic(kaddr); 1645 } 1646 1647 if (page != locked_page) { 1648 if (len < PAGE_SIZE) 1649 zero_user_segment(page, len, PAGE_SIZE); 1650 else 1651 flush_dcache_page(page); 1652 1653 SetPageUptodate(page); 1654 unlock_page(page); 1655 put_page(page); 1656 } 1657 } 1658 1659 int ceph_uninline_data(struct file *filp, struct page *locked_page) 1660 { 1661 struct inode *inode = file_inode(filp); 1662 struct ceph_inode_info *ci = ceph_inode(inode); 1663 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 1664 struct ceph_osd_request *req; 1665 struct page *page = NULL; 1666 u64 len, inline_version; 1667 int err = 0; 1668 bool from_pagecache = false; 1669 1670 spin_lock(&ci->i_ceph_lock); 1671 inline_version = ci->i_inline_version; 1672 spin_unlock(&ci->i_ceph_lock); 1673 1674 dout("uninline_data %p %llx.%llx inline_version %llu\n", 1675 inode, ceph_vinop(inode), inline_version); 1676 1677 if (inline_version == 1 || /* initial version, no data */ 1678 inline_version == CEPH_INLINE_NONE) 1679 goto out; 1680 1681 if (locked_page) { 1682 page = locked_page; 1683 WARN_ON(!PageUptodate(page)); 1684 } else if (ceph_caps_issued(ci) & 1685 (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) { 1686 page = find_get_page(inode->i_mapping, 0); 1687 if (page) { 1688 if (PageUptodate(page)) { 1689 from_pagecache = true; 1690 lock_page(page); 1691 } else { 1692 put_page(page); 1693 page = NULL; 1694 } 1695 } 1696 } 1697 1698 if (page) { 1699 len = i_size_read(inode); 1700 if (len > PAGE_SIZE) 1701 len = PAGE_SIZE; 1702 } else { 1703 page = __page_cache_alloc(GFP_NOFS); 1704 if (!page) { 1705 err = -ENOMEM; 1706 goto out; 1707 } 1708 err = __ceph_do_getattr(inode, page, 1709 CEPH_STAT_CAP_INLINE_DATA, true); 1710 if (err < 0) { 1711 /* no inline data */ 1712 if (err == -ENODATA) 1713 err = 0; 1714 goto out; 1715 } 1716 len = err; 1717 } 1718 1719 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, 1720 ceph_vino(inode), 0, &len, 0, 1, 1721 CEPH_OSD_OP_CREATE, CEPH_OSD_FLAG_WRITE, 1722 NULL, 0, 0, false); 1723 if (IS_ERR(req)) { 1724 err = PTR_ERR(req); 1725 goto out; 1726 } 1727 1728 req->r_mtime = inode->i_mtime; 1729 err = ceph_osdc_start_request(&fsc->client->osdc, req, false); 1730 if (!err) 1731 err = ceph_osdc_wait_request(&fsc->client->osdc, req); 1732 ceph_osdc_put_request(req); 1733 if (err < 0) 1734 goto out; 1735 1736 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, 1737 ceph_vino(inode), 0, &len, 1, 3, 1738 CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE, 1739 NULL, ci->i_truncate_seq, 1740 ci->i_truncate_size, false); 1741 if (IS_ERR(req)) { 1742 err = PTR_ERR(req); 1743 goto out; 1744 } 1745 1746 osd_req_op_extent_osd_data_pages(req, 1, &page, len, 0, false, false); 1747 1748 { 1749 __le64 xattr_buf = cpu_to_le64(inline_version); 1750 err = osd_req_op_xattr_init(req, 0, CEPH_OSD_OP_CMPXATTR, 1751 "inline_version", &xattr_buf, 1752 sizeof(xattr_buf), 1753 CEPH_OSD_CMPXATTR_OP_GT, 1754 CEPH_OSD_CMPXATTR_MODE_U64); 1755 if (err) 1756 goto out_put; 1757 } 1758 1759 { 1760 char xattr_buf[32]; 1761 int xattr_len = snprintf(xattr_buf, sizeof(xattr_buf), 1762 "%llu", inline_version); 1763 err = osd_req_op_xattr_init(req, 2, CEPH_OSD_OP_SETXATTR, 1764 "inline_version", 1765 xattr_buf, xattr_len, 0, 0); 1766 if (err) 1767 goto out_put; 1768 } 1769 1770 req->r_mtime = inode->i_mtime; 1771 err = ceph_osdc_start_request(&fsc->client->osdc, req, false); 1772 if (!err) 1773 err = ceph_osdc_wait_request(&fsc->client->osdc, req); 1774 out_put: 1775 ceph_osdc_put_request(req); 1776 if (err == -ECANCELED) 1777 err = 0; 1778 out: 1779 if (page && page != locked_page) { 1780 if (from_pagecache) { 1781 unlock_page(page); 1782 put_page(page); 1783 } else 1784 __free_pages(page, 0); 1785 } 1786 1787 dout("uninline_data %p %llx.%llx inline_version %llu = %d\n", 1788 inode, ceph_vinop(inode), inline_version, err); 1789 return err; 1790 } 1791 1792 static const struct vm_operations_struct ceph_vmops = { 1793 .fault = ceph_filemap_fault, 1794 .page_mkwrite = ceph_page_mkwrite, 1795 }; 1796 1797 int ceph_mmap(struct file *file, struct vm_area_struct *vma) 1798 { 1799 struct address_space *mapping = file->f_mapping; 1800 1801 if (!mapping->a_ops->readpage) 1802 return -ENOEXEC; 1803 file_accessed(file); 1804 vma->vm_ops = &ceph_vmops; 1805 return 0; 1806 } 1807 1808 enum { 1809 POOL_READ = 1, 1810 POOL_WRITE = 2, 1811 }; 1812 1813 static int __ceph_pool_perm_get(struct ceph_inode_info *ci, 1814 s64 pool, struct ceph_string *pool_ns) 1815 { 1816 struct ceph_fs_client *fsc = ceph_inode_to_client(&ci->vfs_inode); 1817 struct ceph_mds_client *mdsc = fsc->mdsc; 1818 struct ceph_osd_request *rd_req = NULL, *wr_req = NULL; 1819 struct rb_node **p, *parent; 1820 struct ceph_pool_perm *perm; 1821 struct page **pages; 1822 size_t pool_ns_len; 1823 int err = 0, err2 = 0, have = 0; 1824 1825 down_read(&mdsc->pool_perm_rwsem); 1826 p = &mdsc->pool_perm_tree.rb_node; 1827 while (*p) { 1828 perm = rb_entry(*p, struct ceph_pool_perm, node); 1829 if (pool < perm->pool) 1830 p = &(*p)->rb_left; 1831 else if (pool > perm->pool) 1832 p = &(*p)->rb_right; 1833 else { 1834 int ret = ceph_compare_string(pool_ns, 1835 perm->pool_ns, 1836 perm->pool_ns_len); 1837 if (ret < 0) 1838 p = &(*p)->rb_left; 1839 else if (ret > 0) 1840 p = &(*p)->rb_right; 1841 else { 1842 have = perm->perm; 1843 break; 1844 } 1845 } 1846 } 1847 up_read(&mdsc->pool_perm_rwsem); 1848 if (*p) 1849 goto out; 1850 1851 if (pool_ns) 1852 dout("__ceph_pool_perm_get pool %lld ns %.*s no perm cached\n", 1853 pool, (int)pool_ns->len, pool_ns->str); 1854 else 1855 dout("__ceph_pool_perm_get pool %lld no perm cached\n", pool); 1856 1857 down_write(&mdsc->pool_perm_rwsem); 1858 p = &mdsc->pool_perm_tree.rb_node; 1859 parent = NULL; 1860 while (*p) { 1861 parent = *p; 1862 perm = rb_entry(parent, struct ceph_pool_perm, node); 1863 if (pool < perm->pool) 1864 p = &(*p)->rb_left; 1865 else if (pool > perm->pool) 1866 p = &(*p)->rb_right; 1867 else { 1868 int ret = ceph_compare_string(pool_ns, 1869 perm->pool_ns, 1870 perm->pool_ns_len); 1871 if (ret < 0) 1872 p = &(*p)->rb_left; 1873 else if (ret > 0) 1874 p = &(*p)->rb_right; 1875 else { 1876 have = perm->perm; 1877 break; 1878 } 1879 } 1880 } 1881 if (*p) { 1882 up_write(&mdsc->pool_perm_rwsem); 1883 goto out; 1884 } 1885 1886 rd_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL, 1887 1, false, GFP_NOFS); 1888 if (!rd_req) { 1889 err = -ENOMEM; 1890 goto out_unlock; 1891 } 1892 1893 rd_req->r_flags = CEPH_OSD_FLAG_READ; 1894 osd_req_op_init(rd_req, 0, CEPH_OSD_OP_STAT, 0); 1895 rd_req->r_base_oloc.pool = pool; 1896 if (pool_ns) 1897 rd_req->r_base_oloc.pool_ns = ceph_get_string(pool_ns); 1898 ceph_oid_printf(&rd_req->r_base_oid, "%llx.00000000", ci->i_vino.ino); 1899 1900 err = ceph_osdc_alloc_messages(rd_req, GFP_NOFS); 1901 if (err) 1902 goto out_unlock; 1903 1904 wr_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL, 1905 1, false, GFP_NOFS); 1906 if (!wr_req) { 1907 err = -ENOMEM; 1908 goto out_unlock; 1909 } 1910 1911 wr_req->r_flags = CEPH_OSD_FLAG_WRITE; 1912 osd_req_op_init(wr_req, 0, CEPH_OSD_OP_CREATE, CEPH_OSD_OP_FLAG_EXCL); 1913 ceph_oloc_copy(&wr_req->r_base_oloc, &rd_req->r_base_oloc); 1914 ceph_oid_copy(&wr_req->r_base_oid, &rd_req->r_base_oid); 1915 1916 err = ceph_osdc_alloc_messages(wr_req, GFP_NOFS); 1917 if (err) 1918 goto out_unlock; 1919 1920 /* one page should be large enough for STAT data */ 1921 pages = ceph_alloc_page_vector(1, GFP_KERNEL); 1922 if (IS_ERR(pages)) { 1923 err = PTR_ERR(pages); 1924 goto out_unlock; 1925 } 1926 1927 osd_req_op_raw_data_in_pages(rd_req, 0, pages, PAGE_SIZE, 1928 0, false, true); 1929 err = ceph_osdc_start_request(&fsc->client->osdc, rd_req, false); 1930 1931 wr_req->r_mtime = ci->vfs_inode.i_mtime; 1932 wr_req->r_abort_on_full = true; 1933 err2 = ceph_osdc_start_request(&fsc->client->osdc, wr_req, false); 1934 1935 if (!err) 1936 err = ceph_osdc_wait_request(&fsc->client->osdc, rd_req); 1937 if (!err2) 1938 err2 = ceph_osdc_wait_request(&fsc->client->osdc, wr_req); 1939 1940 if (err >= 0 || err == -ENOENT) 1941 have |= POOL_READ; 1942 else if (err != -EPERM) 1943 goto out_unlock; 1944 1945 if (err2 == 0 || err2 == -EEXIST) 1946 have |= POOL_WRITE; 1947 else if (err2 != -EPERM) { 1948 err = err2; 1949 goto out_unlock; 1950 } 1951 1952 pool_ns_len = pool_ns ? pool_ns->len : 0; 1953 perm = kmalloc(sizeof(*perm) + pool_ns_len + 1, GFP_NOFS); 1954 if (!perm) { 1955 err = -ENOMEM; 1956 goto out_unlock; 1957 } 1958 1959 perm->pool = pool; 1960 perm->perm = have; 1961 perm->pool_ns_len = pool_ns_len; 1962 if (pool_ns_len > 0) 1963 memcpy(perm->pool_ns, pool_ns->str, pool_ns_len); 1964 perm->pool_ns[pool_ns_len] = 0; 1965 1966 rb_link_node(&perm->node, parent, p); 1967 rb_insert_color(&perm->node, &mdsc->pool_perm_tree); 1968 err = 0; 1969 out_unlock: 1970 up_write(&mdsc->pool_perm_rwsem); 1971 1972 ceph_osdc_put_request(rd_req); 1973 ceph_osdc_put_request(wr_req); 1974 out: 1975 if (!err) 1976 err = have; 1977 if (pool_ns) 1978 dout("__ceph_pool_perm_get pool %lld ns %.*s result = %d\n", 1979 pool, (int)pool_ns->len, pool_ns->str, err); 1980 else 1981 dout("__ceph_pool_perm_get pool %lld result = %d\n", pool, err); 1982 return err; 1983 } 1984 1985 int ceph_pool_perm_check(struct ceph_inode_info *ci, int need) 1986 { 1987 s64 pool; 1988 struct ceph_string *pool_ns; 1989 int ret, flags; 1990 1991 if (ci->i_vino.snap != CEPH_NOSNAP) { 1992 /* 1993 * Pool permission check needs to write to the first object. 1994 * But for snapshot, head of the first object may have alread 1995 * been deleted. Skip check to avoid creating orphan object. 1996 */ 1997 return 0; 1998 } 1999 2000 if (ceph_test_mount_opt(ceph_inode_to_client(&ci->vfs_inode), 2001 NOPOOLPERM)) 2002 return 0; 2003 2004 spin_lock(&ci->i_ceph_lock); 2005 flags = ci->i_ceph_flags; 2006 pool = ci->i_layout.pool_id; 2007 spin_unlock(&ci->i_ceph_lock); 2008 check: 2009 if (flags & CEPH_I_POOL_PERM) { 2010 if ((need & CEPH_CAP_FILE_RD) && !(flags & CEPH_I_POOL_RD)) { 2011 dout("ceph_pool_perm_check pool %lld no read perm\n", 2012 pool); 2013 return -EPERM; 2014 } 2015 if ((need & CEPH_CAP_FILE_WR) && !(flags & CEPH_I_POOL_WR)) { 2016 dout("ceph_pool_perm_check pool %lld no write perm\n", 2017 pool); 2018 return -EPERM; 2019 } 2020 return 0; 2021 } 2022 2023 pool_ns = ceph_try_get_string(ci->i_layout.pool_ns); 2024 ret = __ceph_pool_perm_get(ci, pool, pool_ns); 2025 ceph_put_string(pool_ns); 2026 if (ret < 0) 2027 return ret; 2028 2029 flags = CEPH_I_POOL_PERM; 2030 if (ret & POOL_READ) 2031 flags |= CEPH_I_POOL_RD; 2032 if (ret & POOL_WRITE) 2033 flags |= CEPH_I_POOL_WR; 2034 2035 spin_lock(&ci->i_ceph_lock); 2036 if (pool == ci->i_layout.pool_id && 2037 pool_ns == rcu_dereference_raw(ci->i_layout.pool_ns)) { 2038 ci->i_ceph_flags |= flags; 2039 } else { 2040 pool = ci->i_layout.pool_id; 2041 flags = ci->i_ceph_flags; 2042 } 2043 spin_unlock(&ci->i_ceph_lock); 2044 goto check; 2045 } 2046 2047 void ceph_pool_perm_destroy(struct ceph_mds_client *mdsc) 2048 { 2049 struct ceph_pool_perm *perm; 2050 struct rb_node *n; 2051 2052 while (!RB_EMPTY_ROOT(&mdsc->pool_perm_tree)) { 2053 n = rb_first(&mdsc->pool_perm_tree); 2054 perm = rb_entry(n, struct ceph_pool_perm, node); 2055 rb_erase(n, &mdsc->pool_perm_tree); 2056 kfree(perm); 2057 } 2058 } 2059