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 if (end - index < (u64)(pvec_pages - 1)) 876 pvec_pages = (unsigned)(end - index) + 1; 877 878 pvec_pages = pagevec_lookup_tag(&pvec, mapping, &index, 879 PAGECACHE_TAG_DIRTY, 880 pvec_pages); 881 dout("pagevec_lookup_tag got %d\n", pvec_pages); 882 if (!pvec_pages && !locked_pages) 883 break; 884 for (i = 0; i < pvec_pages && locked_pages < max_pages; i++) { 885 page = pvec.pages[i]; 886 dout("? %p idx %lu\n", page, page->index); 887 if (locked_pages == 0) 888 lock_page(page); /* first page */ 889 else if (!trylock_page(page)) 890 break; 891 892 /* only dirty pages, or our accounting breaks */ 893 if (unlikely(!PageDirty(page)) || 894 unlikely(page->mapping != mapping)) { 895 dout("!dirty or !mapping %p\n", page); 896 unlock_page(page); 897 continue; 898 } 899 if (page->index > end) { 900 dout("end of range %p\n", page); 901 /* can't be range_cyclic (1st pass) because 902 * end == -1 in that case. */ 903 stop = true; 904 if (ceph_wbc.head_snapc) 905 done = true; 906 unlock_page(page); 907 break; 908 } 909 if (strip_unit_end && (page->index > strip_unit_end)) { 910 dout("end of strip unit %p\n", page); 911 unlock_page(page); 912 break; 913 } 914 if (page_offset(page) >= ceph_wbc.i_size) { 915 dout("%p page eof %llu\n", 916 page, ceph_wbc.i_size); 917 /* not done if range_cyclic */ 918 stop = true; 919 unlock_page(page); 920 break; 921 } 922 if (PageWriteback(page)) { 923 if (wbc->sync_mode == WB_SYNC_NONE) { 924 dout("%p under writeback\n", page); 925 unlock_page(page); 926 continue; 927 } 928 dout("waiting on writeback %p\n", page); 929 wait_on_page_writeback(page); 930 } 931 932 /* only if matching snap context */ 933 pgsnapc = page_snap_context(page); 934 if (pgsnapc != snapc) { 935 dout("page snapc %p %lld != oldest %p %lld\n", 936 pgsnapc, pgsnapc->seq, snapc, snapc->seq); 937 unlock_page(page); 938 continue; 939 } 940 941 if (!clear_page_dirty_for_io(page)) { 942 dout("%p !clear_page_dirty_for_io\n", page); 943 unlock_page(page); 944 continue; 945 } 946 947 /* 948 * We have something to write. If this is 949 * the first locked page this time through, 950 * calculate max possinle write size and 951 * allocate a page array 952 */ 953 if (locked_pages == 0) { 954 u64 objnum; 955 u64 objoff; 956 957 /* prepare async write request */ 958 offset = (u64)page_offset(page); 959 len = wsize; 960 961 rc = ceph_calc_file_object_mapping(&ci->i_layout, 962 offset, len, 963 &objnum, &objoff, 964 &len); 965 if (rc < 0) { 966 unlock_page(page); 967 break; 968 } 969 970 num_ops = 1; 971 strip_unit_end = page->index + 972 ((len - 1) >> PAGE_SHIFT); 973 974 BUG_ON(pages); 975 max_pages = calc_pages_for(0, (u64)len); 976 pages = kmalloc(max_pages * sizeof (*pages), 977 GFP_NOFS); 978 if (!pages) { 979 pool = fsc->wb_pagevec_pool; 980 pages = mempool_alloc(pool, GFP_NOFS); 981 BUG_ON(!pages); 982 } 983 984 len = 0; 985 } else if (page->index != 986 (offset + len) >> PAGE_SHIFT) { 987 if (num_ops >= (pool ? CEPH_OSD_SLAB_OPS : 988 CEPH_OSD_MAX_OPS)) { 989 redirty_page_for_writepage(wbc, page); 990 unlock_page(page); 991 break; 992 } 993 994 num_ops++; 995 offset = (u64)page_offset(page); 996 len = 0; 997 } 998 999 /* note position of first page in pvec */ 1000 dout("%p will write page %p idx %lu\n", 1001 inode, page, page->index); 1002 1003 if (atomic_long_inc_return(&fsc->writeback_count) > 1004 CONGESTION_ON_THRESH( 1005 fsc->mount_options->congestion_kb)) { 1006 set_bdi_congested(inode_to_bdi(inode), 1007 BLK_RW_ASYNC); 1008 } 1009 1010 1011 pages[locked_pages++] = page; 1012 pvec.pages[i] = NULL; 1013 1014 len += PAGE_SIZE; 1015 } 1016 1017 /* did we get anything? */ 1018 if (!locked_pages) 1019 goto release_pvec_pages; 1020 if (i) { 1021 unsigned j, n = 0; 1022 /* shift unused page to beginning of pvec */ 1023 for (j = 0; j < pvec_pages; j++) { 1024 if (!pvec.pages[j]) 1025 continue; 1026 if (n < j) 1027 pvec.pages[n] = pvec.pages[j]; 1028 n++; 1029 } 1030 pvec.nr = n; 1031 1032 if (pvec_pages && i == pvec_pages && 1033 locked_pages < max_pages) { 1034 dout("reached end pvec, trying for more\n"); 1035 pagevec_release(&pvec); 1036 goto get_more_pages; 1037 } 1038 } 1039 1040 new_request: 1041 offset = page_offset(pages[0]); 1042 len = wsize; 1043 1044 req = ceph_osdc_new_request(&fsc->client->osdc, 1045 &ci->i_layout, vino, 1046 offset, &len, 0, num_ops, 1047 CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE, 1048 snapc, ceph_wbc.truncate_seq, 1049 ceph_wbc.truncate_size, false); 1050 if (IS_ERR(req)) { 1051 req = ceph_osdc_new_request(&fsc->client->osdc, 1052 &ci->i_layout, vino, 1053 offset, &len, 0, 1054 min(num_ops, 1055 CEPH_OSD_SLAB_OPS), 1056 CEPH_OSD_OP_WRITE, 1057 CEPH_OSD_FLAG_WRITE, 1058 snapc, ceph_wbc.truncate_seq, 1059 ceph_wbc.truncate_size, true); 1060 BUG_ON(IS_ERR(req)); 1061 } 1062 BUG_ON(len < page_offset(pages[locked_pages - 1]) + 1063 PAGE_SIZE - offset); 1064 1065 req->r_callback = writepages_finish; 1066 req->r_inode = inode; 1067 1068 /* Format the osd request message and submit the write */ 1069 len = 0; 1070 data_pages = pages; 1071 op_idx = 0; 1072 for (i = 0; i < locked_pages; i++) { 1073 u64 cur_offset = page_offset(pages[i]); 1074 if (offset + len != cur_offset) { 1075 if (op_idx + 1 == req->r_num_ops) 1076 break; 1077 osd_req_op_extent_dup_last(req, op_idx, 1078 cur_offset - offset); 1079 dout("writepages got pages at %llu~%llu\n", 1080 offset, len); 1081 osd_req_op_extent_osd_data_pages(req, op_idx, 1082 data_pages, len, 0, 1083 !!pool, false); 1084 osd_req_op_extent_update(req, op_idx, len); 1085 1086 len = 0; 1087 offset = cur_offset; 1088 data_pages = pages + i; 1089 op_idx++; 1090 } 1091 1092 set_page_writeback(pages[i]); 1093 len += PAGE_SIZE; 1094 } 1095 1096 if (ceph_wbc.size_stable) { 1097 len = min(len, ceph_wbc.i_size - offset); 1098 } else if (i == locked_pages) { 1099 /* writepages_finish() clears writeback pages 1100 * according to the data length, so make sure 1101 * data length covers all locked pages */ 1102 u64 min_len = len + 1 - PAGE_SIZE; 1103 len = get_writepages_data_length(inode, pages[i - 1], 1104 offset); 1105 len = max(len, min_len); 1106 } 1107 dout("writepages got pages at %llu~%llu\n", offset, len); 1108 1109 osd_req_op_extent_osd_data_pages(req, op_idx, data_pages, len, 1110 0, !!pool, false); 1111 osd_req_op_extent_update(req, op_idx, len); 1112 1113 BUG_ON(op_idx + 1 != req->r_num_ops); 1114 1115 pool = NULL; 1116 if (i < locked_pages) { 1117 BUG_ON(num_ops <= req->r_num_ops); 1118 num_ops -= req->r_num_ops; 1119 locked_pages -= i; 1120 1121 /* allocate new pages array for next request */ 1122 data_pages = pages; 1123 pages = kmalloc(locked_pages * sizeof (*pages), 1124 GFP_NOFS); 1125 if (!pages) { 1126 pool = fsc->wb_pagevec_pool; 1127 pages = mempool_alloc(pool, GFP_NOFS); 1128 BUG_ON(!pages); 1129 } 1130 memcpy(pages, data_pages + i, 1131 locked_pages * sizeof(*pages)); 1132 memset(data_pages + i, 0, 1133 locked_pages * sizeof(*pages)); 1134 } else { 1135 BUG_ON(num_ops != req->r_num_ops); 1136 index = pages[i - 1]->index + 1; 1137 /* request message now owns the pages array */ 1138 pages = NULL; 1139 } 1140 1141 req->r_mtime = inode->i_mtime; 1142 rc = ceph_osdc_start_request(&fsc->client->osdc, req, true); 1143 BUG_ON(rc); 1144 req = NULL; 1145 1146 wbc->nr_to_write -= i; 1147 if (pages) 1148 goto new_request; 1149 1150 /* 1151 * We stop writing back only if we are not doing 1152 * integrity sync. In case of integrity sync we have to 1153 * keep going until we have written all the pages 1154 * we tagged for writeback prior to entering this loop. 1155 */ 1156 if (wbc->nr_to_write <= 0 && wbc->sync_mode == WB_SYNC_NONE) 1157 done = stop = true; 1158 1159 release_pvec_pages: 1160 dout("pagevec_release on %d pages (%p)\n", (int)pvec.nr, 1161 pvec.nr ? pvec.pages[0] : NULL); 1162 pagevec_release(&pvec); 1163 } 1164 1165 if (should_loop && !done) { 1166 /* more to do; loop back to beginning of file */ 1167 dout("writepages looping back to beginning of file\n"); 1168 end = start_index - 1; /* OK even when start_index == 0 */ 1169 1170 /* to write dirty pages associated with next snapc, 1171 * we need to wait until current writes complete */ 1172 if (wbc->sync_mode != WB_SYNC_NONE && 1173 start_index == 0 && /* all dirty pages were checked */ 1174 !ceph_wbc.head_snapc) { 1175 struct page *page; 1176 unsigned i, nr; 1177 index = 0; 1178 while ((index <= end) && 1179 (nr = pagevec_lookup_tag(&pvec, mapping, &index, 1180 PAGECACHE_TAG_WRITEBACK, 1181 PAGEVEC_SIZE))) { 1182 for (i = 0; i < nr; i++) { 1183 page = pvec.pages[i]; 1184 if (page_snap_context(page) != snapc) 1185 continue; 1186 wait_on_page_writeback(page); 1187 } 1188 pagevec_release(&pvec); 1189 cond_resched(); 1190 } 1191 } 1192 1193 start_index = 0; 1194 index = 0; 1195 goto retry; 1196 } 1197 1198 if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) 1199 mapping->writeback_index = index; 1200 1201 out: 1202 ceph_osdc_put_request(req); 1203 ceph_put_snap_context(last_snapc); 1204 dout("writepages dend - startone, rc = %d\n", rc); 1205 return rc; 1206 } 1207 1208 1209 1210 /* 1211 * See if a given @snapc is either writeable, or already written. 1212 */ 1213 static int context_is_writeable_or_written(struct inode *inode, 1214 struct ceph_snap_context *snapc) 1215 { 1216 struct ceph_snap_context *oldest = get_oldest_context(inode, NULL, NULL); 1217 int ret = !oldest || snapc->seq <= oldest->seq; 1218 1219 ceph_put_snap_context(oldest); 1220 return ret; 1221 } 1222 1223 /* 1224 * We are only allowed to write into/dirty the page if the page is 1225 * clean, or already dirty within the same snap context. 1226 * 1227 * called with page locked. 1228 * return success with page locked, 1229 * or any failure (incl -EAGAIN) with page unlocked. 1230 */ 1231 static int ceph_update_writeable_page(struct file *file, 1232 loff_t pos, unsigned len, 1233 struct page *page) 1234 { 1235 struct inode *inode = file_inode(file); 1236 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 1237 struct ceph_inode_info *ci = ceph_inode(inode); 1238 loff_t page_off = pos & PAGE_MASK; 1239 int pos_in_page = pos & ~PAGE_MASK; 1240 int end_in_page = pos_in_page + len; 1241 loff_t i_size; 1242 int r; 1243 struct ceph_snap_context *snapc, *oldest; 1244 1245 if (READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) { 1246 dout(" page %p forced umount\n", page); 1247 unlock_page(page); 1248 return -EIO; 1249 } 1250 1251 retry_locked: 1252 /* writepages currently holds page lock, but if we change that later, */ 1253 wait_on_page_writeback(page); 1254 1255 snapc = page_snap_context(page); 1256 if (snapc && snapc != ci->i_head_snapc) { 1257 /* 1258 * this page is already dirty in another (older) snap 1259 * context! is it writeable now? 1260 */ 1261 oldest = get_oldest_context(inode, NULL, NULL); 1262 if (snapc->seq > oldest->seq) { 1263 ceph_put_snap_context(oldest); 1264 dout(" page %p snapc %p not current or oldest\n", 1265 page, snapc); 1266 /* 1267 * queue for writeback, and wait for snapc to 1268 * be writeable or written 1269 */ 1270 snapc = ceph_get_snap_context(snapc); 1271 unlock_page(page); 1272 ceph_queue_writeback(inode); 1273 r = wait_event_killable(ci->i_cap_wq, 1274 context_is_writeable_or_written(inode, snapc)); 1275 ceph_put_snap_context(snapc); 1276 if (r == -ERESTARTSYS) 1277 return r; 1278 return -EAGAIN; 1279 } 1280 ceph_put_snap_context(oldest); 1281 1282 /* yay, writeable, do it now (without dropping page lock) */ 1283 dout(" page %p snapc %p not current, but oldest\n", 1284 page, snapc); 1285 if (!clear_page_dirty_for_io(page)) 1286 goto retry_locked; 1287 r = writepage_nounlock(page, NULL); 1288 if (r < 0) 1289 goto fail_unlock; 1290 goto retry_locked; 1291 } 1292 1293 if (PageUptodate(page)) { 1294 dout(" page %p already uptodate\n", page); 1295 return 0; 1296 } 1297 1298 /* full page? */ 1299 if (pos_in_page == 0 && len == PAGE_SIZE) 1300 return 0; 1301 1302 /* past end of file? */ 1303 i_size = i_size_read(inode); 1304 1305 if (page_off >= i_size || 1306 (pos_in_page == 0 && (pos+len) >= i_size && 1307 end_in_page - pos_in_page != PAGE_SIZE)) { 1308 dout(" zeroing %p 0 - %d and %d - %d\n", 1309 page, pos_in_page, end_in_page, (int)PAGE_SIZE); 1310 zero_user_segments(page, 1311 0, pos_in_page, 1312 end_in_page, PAGE_SIZE); 1313 return 0; 1314 } 1315 1316 /* we need to read it. */ 1317 r = ceph_do_readpage(file, page); 1318 if (r < 0) { 1319 if (r == -EINPROGRESS) 1320 return -EAGAIN; 1321 goto fail_unlock; 1322 } 1323 goto retry_locked; 1324 fail_unlock: 1325 unlock_page(page); 1326 return r; 1327 } 1328 1329 /* 1330 * We are only allowed to write into/dirty the page if the page is 1331 * clean, or already dirty within the same snap context. 1332 */ 1333 static int ceph_write_begin(struct file *file, struct address_space *mapping, 1334 loff_t pos, unsigned len, unsigned flags, 1335 struct page **pagep, void **fsdata) 1336 { 1337 struct inode *inode = file_inode(file); 1338 struct page *page; 1339 pgoff_t index = pos >> PAGE_SHIFT; 1340 int r; 1341 1342 do { 1343 /* get a page */ 1344 page = grab_cache_page_write_begin(mapping, index, 0); 1345 if (!page) 1346 return -ENOMEM; 1347 1348 dout("write_begin file %p inode %p page %p %d~%d\n", file, 1349 inode, page, (int)pos, (int)len); 1350 1351 r = ceph_update_writeable_page(file, pos, len, page); 1352 if (r < 0) 1353 put_page(page); 1354 else 1355 *pagep = page; 1356 } while (r == -EAGAIN); 1357 1358 return r; 1359 } 1360 1361 /* 1362 * we don't do anything in here that simple_write_end doesn't do 1363 * except adjust dirty page accounting 1364 */ 1365 static int ceph_write_end(struct file *file, struct address_space *mapping, 1366 loff_t pos, unsigned len, unsigned copied, 1367 struct page *page, void *fsdata) 1368 { 1369 struct inode *inode = file_inode(file); 1370 bool check_cap = false; 1371 1372 dout("write_end file %p inode %p page %p %d~%d (%d)\n", file, 1373 inode, page, (int)pos, (int)copied, (int)len); 1374 1375 /* zero the stale part of the page if we did a short copy */ 1376 if (!PageUptodate(page)) { 1377 if (copied < len) { 1378 copied = 0; 1379 goto out; 1380 } 1381 SetPageUptodate(page); 1382 } 1383 1384 /* did file size increase? */ 1385 if (pos+copied > i_size_read(inode)) 1386 check_cap = ceph_inode_set_size(inode, pos+copied); 1387 1388 set_page_dirty(page); 1389 1390 out: 1391 unlock_page(page); 1392 put_page(page); 1393 1394 if (check_cap) 1395 ceph_check_caps(ceph_inode(inode), CHECK_CAPS_AUTHONLY, NULL); 1396 1397 return copied; 1398 } 1399 1400 /* 1401 * we set .direct_IO to indicate direct io is supported, but since we 1402 * intercept O_DIRECT reads and writes early, this function should 1403 * never get called. 1404 */ 1405 static ssize_t ceph_direct_io(struct kiocb *iocb, struct iov_iter *iter) 1406 { 1407 WARN_ON(1); 1408 return -EINVAL; 1409 } 1410 1411 const struct address_space_operations ceph_aops = { 1412 .readpage = ceph_readpage, 1413 .readpages = ceph_readpages, 1414 .writepage = ceph_writepage, 1415 .writepages = ceph_writepages_start, 1416 .write_begin = ceph_write_begin, 1417 .write_end = ceph_write_end, 1418 .set_page_dirty = ceph_set_page_dirty, 1419 .invalidatepage = ceph_invalidatepage, 1420 .releasepage = ceph_releasepage, 1421 .direct_IO = ceph_direct_io, 1422 }; 1423 1424 static void ceph_block_sigs(sigset_t *oldset) 1425 { 1426 sigset_t mask; 1427 siginitsetinv(&mask, sigmask(SIGKILL)); 1428 sigprocmask(SIG_BLOCK, &mask, oldset); 1429 } 1430 1431 static void ceph_restore_sigs(sigset_t *oldset) 1432 { 1433 sigprocmask(SIG_SETMASK, oldset, NULL); 1434 } 1435 1436 /* 1437 * vm ops 1438 */ 1439 static int ceph_filemap_fault(struct vm_fault *vmf) 1440 { 1441 struct vm_area_struct *vma = vmf->vma; 1442 struct inode *inode = file_inode(vma->vm_file); 1443 struct ceph_inode_info *ci = ceph_inode(inode); 1444 struct ceph_file_info *fi = vma->vm_file->private_data; 1445 struct page *pinned_page = NULL; 1446 loff_t off = vmf->pgoff << PAGE_SHIFT; 1447 int want, got, ret; 1448 sigset_t oldset; 1449 1450 ceph_block_sigs(&oldset); 1451 1452 dout("filemap_fault %p %llx.%llx %llu~%zd trying to get caps\n", 1453 inode, ceph_vinop(inode), off, (size_t)PAGE_SIZE); 1454 if (fi->fmode & CEPH_FILE_MODE_LAZY) 1455 want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO; 1456 else 1457 want = CEPH_CAP_FILE_CACHE; 1458 1459 got = 0; 1460 ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, -1, &got, &pinned_page); 1461 if (ret < 0) 1462 goto out_restore; 1463 1464 dout("filemap_fault %p %llu~%zd got cap refs on %s\n", 1465 inode, off, (size_t)PAGE_SIZE, ceph_cap_string(got)); 1466 1467 if ((got & (CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO)) || 1468 ci->i_inline_version == CEPH_INLINE_NONE) { 1469 current->journal_info = vma->vm_file; 1470 ret = filemap_fault(vmf); 1471 current->journal_info = NULL; 1472 } else 1473 ret = -EAGAIN; 1474 1475 dout("filemap_fault %p %llu~%zd dropping cap refs on %s ret %d\n", 1476 inode, off, (size_t)PAGE_SIZE, ceph_cap_string(got), ret); 1477 if (pinned_page) 1478 put_page(pinned_page); 1479 ceph_put_cap_refs(ci, got); 1480 1481 if (ret != -EAGAIN) 1482 goto out_restore; 1483 1484 /* read inline data */ 1485 if (off >= PAGE_SIZE) { 1486 /* does not support inline data > PAGE_SIZE */ 1487 ret = VM_FAULT_SIGBUS; 1488 } else { 1489 int ret1; 1490 struct address_space *mapping = inode->i_mapping; 1491 struct page *page = find_or_create_page(mapping, 0, 1492 mapping_gfp_constraint(mapping, 1493 ~__GFP_FS)); 1494 if (!page) { 1495 ret = VM_FAULT_OOM; 1496 goto out_inline; 1497 } 1498 ret1 = __ceph_do_getattr(inode, page, 1499 CEPH_STAT_CAP_INLINE_DATA, true); 1500 if (ret1 < 0 || off >= i_size_read(inode)) { 1501 unlock_page(page); 1502 put_page(page); 1503 if (ret1 < 0) 1504 ret = ret1; 1505 else 1506 ret = VM_FAULT_SIGBUS; 1507 goto out_inline; 1508 } 1509 if (ret1 < PAGE_SIZE) 1510 zero_user_segment(page, ret1, PAGE_SIZE); 1511 else 1512 flush_dcache_page(page); 1513 SetPageUptodate(page); 1514 vmf->page = page; 1515 ret = VM_FAULT_MAJOR | VM_FAULT_LOCKED; 1516 out_inline: 1517 dout("filemap_fault %p %llu~%zd read inline data ret %d\n", 1518 inode, off, (size_t)PAGE_SIZE, ret); 1519 } 1520 out_restore: 1521 ceph_restore_sigs(&oldset); 1522 if (ret < 0) 1523 ret = (ret == -ENOMEM) ? VM_FAULT_OOM : VM_FAULT_SIGBUS; 1524 1525 return ret; 1526 } 1527 1528 /* 1529 * Reuse write_begin here for simplicity. 1530 */ 1531 static int ceph_page_mkwrite(struct vm_fault *vmf) 1532 { 1533 struct vm_area_struct *vma = vmf->vma; 1534 struct inode *inode = file_inode(vma->vm_file); 1535 struct ceph_inode_info *ci = ceph_inode(inode); 1536 struct ceph_file_info *fi = vma->vm_file->private_data; 1537 struct ceph_cap_flush *prealloc_cf; 1538 struct page *page = vmf->page; 1539 loff_t off = page_offset(page); 1540 loff_t size = i_size_read(inode); 1541 size_t len; 1542 int want, got, ret; 1543 sigset_t oldset; 1544 1545 prealloc_cf = ceph_alloc_cap_flush(); 1546 if (!prealloc_cf) 1547 return VM_FAULT_OOM; 1548 1549 ceph_block_sigs(&oldset); 1550 1551 if (ci->i_inline_version != CEPH_INLINE_NONE) { 1552 struct page *locked_page = NULL; 1553 if (off == 0) { 1554 lock_page(page); 1555 locked_page = page; 1556 } 1557 ret = ceph_uninline_data(vma->vm_file, locked_page); 1558 if (locked_page) 1559 unlock_page(locked_page); 1560 if (ret < 0) 1561 goto out_free; 1562 } 1563 1564 if (off + PAGE_SIZE <= size) 1565 len = PAGE_SIZE; 1566 else 1567 len = size & ~PAGE_MASK; 1568 1569 dout("page_mkwrite %p %llx.%llx %llu~%zd getting caps i_size %llu\n", 1570 inode, ceph_vinop(inode), off, len, size); 1571 if (fi->fmode & CEPH_FILE_MODE_LAZY) 1572 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO; 1573 else 1574 want = CEPH_CAP_FILE_BUFFER; 1575 1576 got = 0; 1577 ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, off + len, 1578 &got, NULL); 1579 if (ret < 0) 1580 goto out_free; 1581 1582 dout("page_mkwrite %p %llu~%zd got cap refs on %s\n", 1583 inode, off, len, ceph_cap_string(got)); 1584 1585 /* Update time before taking page lock */ 1586 file_update_time(vma->vm_file); 1587 1588 do { 1589 lock_page(page); 1590 1591 if ((off > size) || (page->mapping != inode->i_mapping)) { 1592 unlock_page(page); 1593 ret = VM_FAULT_NOPAGE; 1594 break; 1595 } 1596 1597 ret = ceph_update_writeable_page(vma->vm_file, off, len, page); 1598 if (ret >= 0) { 1599 /* success. we'll keep the page locked. */ 1600 set_page_dirty(page); 1601 ret = VM_FAULT_LOCKED; 1602 } 1603 } while (ret == -EAGAIN); 1604 1605 if (ret == VM_FAULT_LOCKED || 1606 ci->i_inline_version != CEPH_INLINE_NONE) { 1607 int dirty; 1608 spin_lock(&ci->i_ceph_lock); 1609 ci->i_inline_version = CEPH_INLINE_NONE; 1610 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR, 1611 &prealloc_cf); 1612 spin_unlock(&ci->i_ceph_lock); 1613 if (dirty) 1614 __mark_inode_dirty(inode, dirty); 1615 } 1616 1617 dout("page_mkwrite %p %llu~%zd dropping cap refs on %s ret %d\n", 1618 inode, off, len, ceph_cap_string(got), ret); 1619 ceph_put_cap_refs(ci, got); 1620 out_free: 1621 ceph_restore_sigs(&oldset); 1622 ceph_free_cap_flush(prealloc_cf); 1623 if (ret < 0) 1624 ret = (ret == -ENOMEM) ? VM_FAULT_OOM : VM_FAULT_SIGBUS; 1625 return ret; 1626 } 1627 1628 void ceph_fill_inline_data(struct inode *inode, struct page *locked_page, 1629 char *data, size_t len) 1630 { 1631 struct address_space *mapping = inode->i_mapping; 1632 struct page *page; 1633 1634 if (locked_page) { 1635 page = locked_page; 1636 } else { 1637 if (i_size_read(inode) == 0) 1638 return; 1639 page = find_or_create_page(mapping, 0, 1640 mapping_gfp_constraint(mapping, 1641 ~__GFP_FS)); 1642 if (!page) 1643 return; 1644 if (PageUptodate(page)) { 1645 unlock_page(page); 1646 put_page(page); 1647 return; 1648 } 1649 } 1650 1651 dout("fill_inline_data %p %llx.%llx len %zu locked_page %p\n", 1652 inode, ceph_vinop(inode), len, locked_page); 1653 1654 if (len > 0) { 1655 void *kaddr = kmap_atomic(page); 1656 memcpy(kaddr, data, len); 1657 kunmap_atomic(kaddr); 1658 } 1659 1660 if (page != locked_page) { 1661 if (len < PAGE_SIZE) 1662 zero_user_segment(page, len, PAGE_SIZE); 1663 else 1664 flush_dcache_page(page); 1665 1666 SetPageUptodate(page); 1667 unlock_page(page); 1668 put_page(page); 1669 } 1670 } 1671 1672 int ceph_uninline_data(struct file *filp, struct page *locked_page) 1673 { 1674 struct inode *inode = file_inode(filp); 1675 struct ceph_inode_info *ci = ceph_inode(inode); 1676 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 1677 struct ceph_osd_request *req; 1678 struct page *page = NULL; 1679 u64 len, inline_version; 1680 int err = 0; 1681 bool from_pagecache = false; 1682 1683 spin_lock(&ci->i_ceph_lock); 1684 inline_version = ci->i_inline_version; 1685 spin_unlock(&ci->i_ceph_lock); 1686 1687 dout("uninline_data %p %llx.%llx inline_version %llu\n", 1688 inode, ceph_vinop(inode), inline_version); 1689 1690 if (inline_version == 1 || /* initial version, no data */ 1691 inline_version == CEPH_INLINE_NONE) 1692 goto out; 1693 1694 if (locked_page) { 1695 page = locked_page; 1696 WARN_ON(!PageUptodate(page)); 1697 } else if (ceph_caps_issued(ci) & 1698 (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) { 1699 page = find_get_page(inode->i_mapping, 0); 1700 if (page) { 1701 if (PageUptodate(page)) { 1702 from_pagecache = true; 1703 lock_page(page); 1704 } else { 1705 put_page(page); 1706 page = NULL; 1707 } 1708 } 1709 } 1710 1711 if (page) { 1712 len = i_size_read(inode); 1713 if (len > PAGE_SIZE) 1714 len = PAGE_SIZE; 1715 } else { 1716 page = __page_cache_alloc(GFP_NOFS); 1717 if (!page) { 1718 err = -ENOMEM; 1719 goto out; 1720 } 1721 err = __ceph_do_getattr(inode, page, 1722 CEPH_STAT_CAP_INLINE_DATA, true); 1723 if (err < 0) { 1724 /* no inline data */ 1725 if (err == -ENODATA) 1726 err = 0; 1727 goto out; 1728 } 1729 len = err; 1730 } 1731 1732 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, 1733 ceph_vino(inode), 0, &len, 0, 1, 1734 CEPH_OSD_OP_CREATE, CEPH_OSD_FLAG_WRITE, 1735 NULL, 0, 0, false); 1736 if (IS_ERR(req)) { 1737 err = PTR_ERR(req); 1738 goto out; 1739 } 1740 1741 req->r_mtime = inode->i_mtime; 1742 err = ceph_osdc_start_request(&fsc->client->osdc, req, false); 1743 if (!err) 1744 err = ceph_osdc_wait_request(&fsc->client->osdc, req); 1745 ceph_osdc_put_request(req); 1746 if (err < 0) 1747 goto out; 1748 1749 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, 1750 ceph_vino(inode), 0, &len, 1, 3, 1751 CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE, 1752 NULL, ci->i_truncate_seq, 1753 ci->i_truncate_size, false); 1754 if (IS_ERR(req)) { 1755 err = PTR_ERR(req); 1756 goto out; 1757 } 1758 1759 osd_req_op_extent_osd_data_pages(req, 1, &page, len, 0, false, false); 1760 1761 { 1762 __le64 xattr_buf = cpu_to_le64(inline_version); 1763 err = osd_req_op_xattr_init(req, 0, CEPH_OSD_OP_CMPXATTR, 1764 "inline_version", &xattr_buf, 1765 sizeof(xattr_buf), 1766 CEPH_OSD_CMPXATTR_OP_GT, 1767 CEPH_OSD_CMPXATTR_MODE_U64); 1768 if (err) 1769 goto out_put; 1770 } 1771 1772 { 1773 char xattr_buf[32]; 1774 int xattr_len = snprintf(xattr_buf, sizeof(xattr_buf), 1775 "%llu", inline_version); 1776 err = osd_req_op_xattr_init(req, 2, CEPH_OSD_OP_SETXATTR, 1777 "inline_version", 1778 xattr_buf, xattr_len, 0, 0); 1779 if (err) 1780 goto out_put; 1781 } 1782 1783 req->r_mtime = inode->i_mtime; 1784 err = ceph_osdc_start_request(&fsc->client->osdc, req, false); 1785 if (!err) 1786 err = ceph_osdc_wait_request(&fsc->client->osdc, req); 1787 out_put: 1788 ceph_osdc_put_request(req); 1789 if (err == -ECANCELED) 1790 err = 0; 1791 out: 1792 if (page && page != locked_page) { 1793 if (from_pagecache) { 1794 unlock_page(page); 1795 put_page(page); 1796 } else 1797 __free_pages(page, 0); 1798 } 1799 1800 dout("uninline_data %p %llx.%llx inline_version %llu = %d\n", 1801 inode, ceph_vinop(inode), inline_version, err); 1802 return err; 1803 } 1804 1805 static const struct vm_operations_struct ceph_vmops = { 1806 .fault = ceph_filemap_fault, 1807 .page_mkwrite = ceph_page_mkwrite, 1808 }; 1809 1810 int ceph_mmap(struct file *file, struct vm_area_struct *vma) 1811 { 1812 struct address_space *mapping = file->f_mapping; 1813 1814 if (!mapping->a_ops->readpage) 1815 return -ENOEXEC; 1816 file_accessed(file); 1817 vma->vm_ops = &ceph_vmops; 1818 return 0; 1819 } 1820 1821 enum { 1822 POOL_READ = 1, 1823 POOL_WRITE = 2, 1824 }; 1825 1826 static int __ceph_pool_perm_get(struct ceph_inode_info *ci, 1827 s64 pool, struct ceph_string *pool_ns) 1828 { 1829 struct ceph_fs_client *fsc = ceph_inode_to_client(&ci->vfs_inode); 1830 struct ceph_mds_client *mdsc = fsc->mdsc; 1831 struct ceph_osd_request *rd_req = NULL, *wr_req = NULL; 1832 struct rb_node **p, *parent; 1833 struct ceph_pool_perm *perm; 1834 struct page **pages; 1835 size_t pool_ns_len; 1836 int err = 0, err2 = 0, have = 0; 1837 1838 down_read(&mdsc->pool_perm_rwsem); 1839 p = &mdsc->pool_perm_tree.rb_node; 1840 while (*p) { 1841 perm = rb_entry(*p, struct ceph_pool_perm, node); 1842 if (pool < perm->pool) 1843 p = &(*p)->rb_left; 1844 else if (pool > perm->pool) 1845 p = &(*p)->rb_right; 1846 else { 1847 int ret = ceph_compare_string(pool_ns, 1848 perm->pool_ns, 1849 perm->pool_ns_len); 1850 if (ret < 0) 1851 p = &(*p)->rb_left; 1852 else if (ret > 0) 1853 p = &(*p)->rb_right; 1854 else { 1855 have = perm->perm; 1856 break; 1857 } 1858 } 1859 } 1860 up_read(&mdsc->pool_perm_rwsem); 1861 if (*p) 1862 goto out; 1863 1864 if (pool_ns) 1865 dout("__ceph_pool_perm_get pool %lld ns %.*s no perm cached\n", 1866 pool, (int)pool_ns->len, pool_ns->str); 1867 else 1868 dout("__ceph_pool_perm_get pool %lld no perm cached\n", pool); 1869 1870 down_write(&mdsc->pool_perm_rwsem); 1871 p = &mdsc->pool_perm_tree.rb_node; 1872 parent = NULL; 1873 while (*p) { 1874 parent = *p; 1875 perm = rb_entry(parent, struct ceph_pool_perm, node); 1876 if (pool < perm->pool) 1877 p = &(*p)->rb_left; 1878 else if (pool > perm->pool) 1879 p = &(*p)->rb_right; 1880 else { 1881 int ret = ceph_compare_string(pool_ns, 1882 perm->pool_ns, 1883 perm->pool_ns_len); 1884 if (ret < 0) 1885 p = &(*p)->rb_left; 1886 else if (ret > 0) 1887 p = &(*p)->rb_right; 1888 else { 1889 have = perm->perm; 1890 break; 1891 } 1892 } 1893 } 1894 if (*p) { 1895 up_write(&mdsc->pool_perm_rwsem); 1896 goto out; 1897 } 1898 1899 rd_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL, 1900 1, false, GFP_NOFS); 1901 if (!rd_req) { 1902 err = -ENOMEM; 1903 goto out_unlock; 1904 } 1905 1906 rd_req->r_flags = CEPH_OSD_FLAG_READ; 1907 osd_req_op_init(rd_req, 0, CEPH_OSD_OP_STAT, 0); 1908 rd_req->r_base_oloc.pool = pool; 1909 if (pool_ns) 1910 rd_req->r_base_oloc.pool_ns = ceph_get_string(pool_ns); 1911 ceph_oid_printf(&rd_req->r_base_oid, "%llx.00000000", ci->i_vino.ino); 1912 1913 err = ceph_osdc_alloc_messages(rd_req, GFP_NOFS); 1914 if (err) 1915 goto out_unlock; 1916 1917 wr_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL, 1918 1, false, GFP_NOFS); 1919 if (!wr_req) { 1920 err = -ENOMEM; 1921 goto out_unlock; 1922 } 1923 1924 wr_req->r_flags = CEPH_OSD_FLAG_WRITE; 1925 osd_req_op_init(wr_req, 0, CEPH_OSD_OP_CREATE, CEPH_OSD_OP_FLAG_EXCL); 1926 ceph_oloc_copy(&wr_req->r_base_oloc, &rd_req->r_base_oloc); 1927 ceph_oid_copy(&wr_req->r_base_oid, &rd_req->r_base_oid); 1928 1929 err = ceph_osdc_alloc_messages(wr_req, GFP_NOFS); 1930 if (err) 1931 goto out_unlock; 1932 1933 /* one page should be large enough for STAT data */ 1934 pages = ceph_alloc_page_vector(1, GFP_KERNEL); 1935 if (IS_ERR(pages)) { 1936 err = PTR_ERR(pages); 1937 goto out_unlock; 1938 } 1939 1940 osd_req_op_raw_data_in_pages(rd_req, 0, pages, PAGE_SIZE, 1941 0, false, true); 1942 err = ceph_osdc_start_request(&fsc->client->osdc, rd_req, false); 1943 1944 wr_req->r_mtime = ci->vfs_inode.i_mtime; 1945 wr_req->r_abort_on_full = true; 1946 err2 = ceph_osdc_start_request(&fsc->client->osdc, wr_req, false); 1947 1948 if (!err) 1949 err = ceph_osdc_wait_request(&fsc->client->osdc, rd_req); 1950 if (!err2) 1951 err2 = ceph_osdc_wait_request(&fsc->client->osdc, wr_req); 1952 1953 if (err >= 0 || err == -ENOENT) 1954 have |= POOL_READ; 1955 else if (err != -EPERM) 1956 goto out_unlock; 1957 1958 if (err2 == 0 || err2 == -EEXIST) 1959 have |= POOL_WRITE; 1960 else if (err2 != -EPERM) { 1961 err = err2; 1962 goto out_unlock; 1963 } 1964 1965 pool_ns_len = pool_ns ? pool_ns->len : 0; 1966 perm = kmalloc(sizeof(*perm) + pool_ns_len + 1, GFP_NOFS); 1967 if (!perm) { 1968 err = -ENOMEM; 1969 goto out_unlock; 1970 } 1971 1972 perm->pool = pool; 1973 perm->perm = have; 1974 perm->pool_ns_len = pool_ns_len; 1975 if (pool_ns_len > 0) 1976 memcpy(perm->pool_ns, pool_ns->str, pool_ns_len); 1977 perm->pool_ns[pool_ns_len] = 0; 1978 1979 rb_link_node(&perm->node, parent, p); 1980 rb_insert_color(&perm->node, &mdsc->pool_perm_tree); 1981 err = 0; 1982 out_unlock: 1983 up_write(&mdsc->pool_perm_rwsem); 1984 1985 ceph_osdc_put_request(rd_req); 1986 ceph_osdc_put_request(wr_req); 1987 out: 1988 if (!err) 1989 err = have; 1990 if (pool_ns) 1991 dout("__ceph_pool_perm_get pool %lld ns %.*s result = %d\n", 1992 pool, (int)pool_ns->len, pool_ns->str, err); 1993 else 1994 dout("__ceph_pool_perm_get pool %lld result = %d\n", pool, err); 1995 return err; 1996 } 1997 1998 int ceph_pool_perm_check(struct ceph_inode_info *ci, int need) 1999 { 2000 s64 pool; 2001 struct ceph_string *pool_ns; 2002 int ret, flags; 2003 2004 if (ci->i_vino.snap != CEPH_NOSNAP) { 2005 /* 2006 * Pool permission check needs to write to the first object. 2007 * But for snapshot, head of the first object may have alread 2008 * been deleted. Skip check to avoid creating orphan object. 2009 */ 2010 return 0; 2011 } 2012 2013 if (ceph_test_mount_opt(ceph_inode_to_client(&ci->vfs_inode), 2014 NOPOOLPERM)) 2015 return 0; 2016 2017 spin_lock(&ci->i_ceph_lock); 2018 flags = ci->i_ceph_flags; 2019 pool = ci->i_layout.pool_id; 2020 spin_unlock(&ci->i_ceph_lock); 2021 check: 2022 if (flags & CEPH_I_POOL_PERM) { 2023 if ((need & CEPH_CAP_FILE_RD) && !(flags & CEPH_I_POOL_RD)) { 2024 dout("ceph_pool_perm_check pool %lld no read perm\n", 2025 pool); 2026 return -EPERM; 2027 } 2028 if ((need & CEPH_CAP_FILE_WR) && !(flags & CEPH_I_POOL_WR)) { 2029 dout("ceph_pool_perm_check pool %lld no write perm\n", 2030 pool); 2031 return -EPERM; 2032 } 2033 return 0; 2034 } 2035 2036 pool_ns = ceph_try_get_string(ci->i_layout.pool_ns); 2037 ret = __ceph_pool_perm_get(ci, pool, pool_ns); 2038 ceph_put_string(pool_ns); 2039 if (ret < 0) 2040 return ret; 2041 2042 flags = CEPH_I_POOL_PERM; 2043 if (ret & POOL_READ) 2044 flags |= CEPH_I_POOL_RD; 2045 if (ret & POOL_WRITE) 2046 flags |= CEPH_I_POOL_WR; 2047 2048 spin_lock(&ci->i_ceph_lock); 2049 if (pool == ci->i_layout.pool_id && 2050 pool_ns == rcu_dereference_raw(ci->i_layout.pool_ns)) { 2051 ci->i_ceph_flags |= flags; 2052 } else { 2053 pool = ci->i_layout.pool_id; 2054 flags = ci->i_ceph_flags; 2055 } 2056 spin_unlock(&ci->i_ceph_lock); 2057 goto check; 2058 } 2059 2060 void ceph_pool_perm_destroy(struct ceph_mds_client *mdsc) 2061 { 2062 struct ceph_pool_perm *perm; 2063 struct rb_node *n; 2064 2065 while (!RB_EMPTY_ROOT(&mdsc->pool_perm_tree)) { 2066 n = rb_first(&mdsc->pool_perm_tree); 2067 perm = rb_entry(n, struct ceph_pool_perm, node); 2068 rb_erase(n, &mdsc->pool_perm_tree); 2069 kfree(perm); 2070 } 2071 } 2072