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 ceph_rw_context *rw_ctx, 303 struct list_head *page_list, int max) 304 { 305 struct ceph_osd_client *osdc = 306 &ceph_inode_to_client(inode)->client->osdc; 307 struct ceph_inode_info *ci = ceph_inode(inode); 308 struct page *page = list_entry(page_list->prev, struct page, lru); 309 struct ceph_vino vino; 310 struct ceph_osd_request *req; 311 u64 off; 312 u64 len; 313 int i; 314 struct page **pages; 315 pgoff_t next_index; 316 int nr_pages = 0; 317 int got = 0; 318 int ret = 0; 319 320 if (!rw_ctx) { 321 /* caller of readpages does not hold buffer and read caps 322 * (fadvise, madvise and readahead cases) */ 323 int want = CEPH_CAP_FILE_CACHE; 324 ret = ceph_try_get_caps(ci, CEPH_CAP_FILE_RD, want, &got); 325 if (ret < 0) { 326 dout("start_read %p, error getting cap\n", inode); 327 } else if (!(got & want)) { 328 dout("start_read %p, no cache cap\n", inode); 329 ret = 0; 330 } 331 if (ret <= 0) { 332 if (got) 333 ceph_put_cap_refs(ci, got); 334 while (!list_empty(page_list)) { 335 page = list_entry(page_list->prev, 336 struct page, lru); 337 list_del(&page->lru); 338 put_page(page); 339 } 340 return ret; 341 } 342 } 343 344 off = (u64) page_offset(page); 345 346 /* count pages */ 347 next_index = page->index; 348 list_for_each_entry_reverse(page, page_list, lru) { 349 if (page->index != next_index) 350 break; 351 nr_pages++; 352 next_index++; 353 if (max && nr_pages == max) 354 break; 355 } 356 len = nr_pages << PAGE_SHIFT; 357 dout("start_read %p nr_pages %d is %lld~%lld\n", inode, nr_pages, 358 off, len); 359 vino = ceph_vino(inode); 360 req = ceph_osdc_new_request(osdc, &ci->i_layout, vino, off, &len, 361 0, 1, CEPH_OSD_OP_READ, 362 CEPH_OSD_FLAG_READ, NULL, 363 ci->i_truncate_seq, ci->i_truncate_size, 364 false); 365 if (IS_ERR(req)) { 366 ret = PTR_ERR(req); 367 goto out; 368 } 369 370 /* build page vector */ 371 nr_pages = calc_pages_for(0, len); 372 pages = kmalloc(sizeof(*pages) * nr_pages, GFP_KERNEL); 373 if (!pages) { 374 ret = -ENOMEM; 375 goto out_put; 376 } 377 for (i = 0; i < nr_pages; ++i) { 378 page = list_entry(page_list->prev, struct page, lru); 379 BUG_ON(PageLocked(page)); 380 list_del(&page->lru); 381 382 dout("start_read %p adding %p idx %lu\n", inode, page, 383 page->index); 384 if (add_to_page_cache_lru(page, &inode->i_data, page->index, 385 GFP_KERNEL)) { 386 ceph_fscache_uncache_page(inode, page); 387 put_page(page); 388 dout("start_read %p add_to_page_cache failed %p\n", 389 inode, page); 390 nr_pages = i; 391 if (nr_pages > 0) { 392 len = nr_pages << PAGE_SHIFT; 393 osd_req_op_extent_update(req, 0, len); 394 break; 395 } 396 goto out_pages; 397 } 398 pages[i] = page; 399 } 400 osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0, false, false); 401 req->r_callback = finish_read; 402 req->r_inode = inode; 403 404 dout("start_read %p starting %p %lld~%lld\n", inode, req, off, len); 405 ret = ceph_osdc_start_request(osdc, req, false); 406 if (ret < 0) 407 goto out_pages; 408 ceph_osdc_put_request(req); 409 410 /* After adding locked pages to page cache, the inode holds cache cap. 411 * So we can drop our cap refs. */ 412 if (got) 413 ceph_put_cap_refs(ci, got); 414 415 return nr_pages; 416 417 out_pages: 418 for (i = 0; i < nr_pages; ++i) { 419 ceph_fscache_readpage_cancel(inode, pages[i]); 420 unlock_page(pages[i]); 421 } 422 ceph_put_page_vector(pages, nr_pages, false); 423 out_put: 424 ceph_osdc_put_request(req); 425 out: 426 if (got) 427 ceph_put_cap_refs(ci, got); 428 return ret; 429 } 430 431 432 /* 433 * Read multiple pages. Leave pages we don't read + unlock in page_list; 434 * the caller (VM) cleans them up. 435 */ 436 static int ceph_readpages(struct file *file, struct address_space *mapping, 437 struct list_head *page_list, unsigned nr_pages) 438 { 439 struct inode *inode = file_inode(file); 440 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 441 struct ceph_file_info *ci = file->private_data; 442 struct ceph_rw_context *rw_ctx; 443 int rc = 0; 444 int max = 0; 445 446 if (ceph_inode(inode)->i_inline_version != CEPH_INLINE_NONE) 447 return -EINVAL; 448 449 rc = ceph_readpages_from_fscache(mapping->host, mapping, page_list, 450 &nr_pages); 451 452 if (rc == 0) 453 goto out; 454 455 rw_ctx = ceph_find_rw_context(ci); 456 max = fsc->mount_options->rsize >> PAGE_SHIFT; 457 dout("readpages %p file %p ctx %p nr_pages %d max %d\n", 458 inode, file, rw_ctx, nr_pages, max); 459 while (!list_empty(page_list)) { 460 rc = start_read(inode, rw_ctx, page_list, max); 461 if (rc < 0) 462 goto out; 463 } 464 out: 465 ceph_fscache_readpages_cancel(inode, page_list); 466 467 dout("readpages %p file %p ret %d\n", inode, file, rc); 468 return rc; 469 } 470 471 struct ceph_writeback_ctl 472 { 473 loff_t i_size; 474 u64 truncate_size; 475 u32 truncate_seq; 476 bool size_stable; 477 bool head_snapc; 478 }; 479 480 /* 481 * Get ref for the oldest snapc for an inode with dirty data... that is, the 482 * only snap context we are allowed to write back. 483 */ 484 static struct ceph_snap_context * 485 get_oldest_context(struct inode *inode, struct ceph_writeback_ctl *ctl, 486 struct ceph_snap_context *page_snapc) 487 { 488 struct ceph_inode_info *ci = ceph_inode(inode); 489 struct ceph_snap_context *snapc = NULL; 490 struct ceph_cap_snap *capsnap = NULL; 491 492 spin_lock(&ci->i_ceph_lock); 493 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) { 494 dout(" cap_snap %p snapc %p has %d dirty pages\n", capsnap, 495 capsnap->context, capsnap->dirty_pages); 496 if (!capsnap->dirty_pages) 497 continue; 498 499 /* get i_size, truncate_{seq,size} for page_snapc? */ 500 if (snapc && capsnap->context != page_snapc) 501 continue; 502 503 if (ctl) { 504 if (capsnap->writing) { 505 ctl->i_size = i_size_read(inode); 506 ctl->size_stable = false; 507 } else { 508 ctl->i_size = capsnap->size; 509 ctl->size_stable = true; 510 } 511 ctl->truncate_size = capsnap->truncate_size; 512 ctl->truncate_seq = capsnap->truncate_seq; 513 ctl->head_snapc = false; 514 } 515 516 if (snapc) 517 break; 518 519 snapc = ceph_get_snap_context(capsnap->context); 520 if (!page_snapc || 521 page_snapc == snapc || 522 page_snapc->seq > snapc->seq) 523 break; 524 } 525 if (!snapc && ci->i_wrbuffer_ref_head) { 526 snapc = ceph_get_snap_context(ci->i_head_snapc); 527 dout(" head snapc %p has %d dirty pages\n", 528 snapc, ci->i_wrbuffer_ref_head); 529 if (ctl) { 530 ctl->i_size = i_size_read(inode); 531 ctl->truncate_size = ci->i_truncate_size; 532 ctl->truncate_seq = ci->i_truncate_seq; 533 ctl->size_stable = false; 534 ctl->head_snapc = true; 535 } 536 } 537 spin_unlock(&ci->i_ceph_lock); 538 return snapc; 539 } 540 541 static u64 get_writepages_data_length(struct inode *inode, 542 struct page *page, u64 start) 543 { 544 struct ceph_inode_info *ci = ceph_inode(inode); 545 struct ceph_snap_context *snapc = page_snap_context(page); 546 struct ceph_cap_snap *capsnap = NULL; 547 u64 end = i_size_read(inode); 548 549 if (snapc != ci->i_head_snapc) { 550 bool found = false; 551 spin_lock(&ci->i_ceph_lock); 552 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) { 553 if (capsnap->context == snapc) { 554 if (!capsnap->writing) 555 end = capsnap->size; 556 found = true; 557 break; 558 } 559 } 560 spin_unlock(&ci->i_ceph_lock); 561 WARN_ON(!found); 562 } 563 if (end > page_offset(page) + PAGE_SIZE) 564 end = page_offset(page) + PAGE_SIZE; 565 return end > start ? end - start : 0; 566 } 567 568 /* 569 * Write a single page, but leave the page locked. 570 * 571 * If we get a write error, set the page error bit, but still adjust the 572 * dirty page accounting (i.e., page is no longer dirty). 573 */ 574 static int writepage_nounlock(struct page *page, struct writeback_control *wbc) 575 { 576 struct inode *inode; 577 struct ceph_inode_info *ci; 578 struct ceph_fs_client *fsc; 579 struct ceph_snap_context *snapc, *oldest; 580 loff_t page_off = page_offset(page); 581 long writeback_stat; 582 int err, len = PAGE_SIZE; 583 struct ceph_writeback_ctl ceph_wbc; 584 585 dout("writepage %p idx %lu\n", page, page->index); 586 587 inode = page->mapping->host; 588 ci = ceph_inode(inode); 589 fsc = ceph_inode_to_client(inode); 590 591 /* verify this is a writeable snap context */ 592 snapc = page_snap_context(page); 593 if (!snapc) { 594 dout("writepage %p page %p not dirty?\n", inode, page); 595 return 0; 596 } 597 oldest = get_oldest_context(inode, &ceph_wbc, snapc); 598 if (snapc->seq > oldest->seq) { 599 dout("writepage %p page %p snapc %p not writeable - noop\n", 600 inode, page, snapc); 601 /* we should only noop if called by kswapd */ 602 WARN_ON(!(current->flags & PF_MEMALLOC)); 603 ceph_put_snap_context(oldest); 604 redirty_page_for_writepage(wbc, page); 605 return 0; 606 } 607 ceph_put_snap_context(oldest); 608 609 /* is this a partial page at end of file? */ 610 if (page_off >= ceph_wbc.i_size) { 611 dout("%p page eof %llu\n", page, ceph_wbc.i_size); 612 page->mapping->a_ops->invalidatepage(page, 0, PAGE_SIZE); 613 return 0; 614 } 615 616 if (ceph_wbc.i_size < page_off + len) 617 len = ceph_wbc.i_size - page_off; 618 619 dout("writepage %p page %p index %lu on %llu~%u snapc %p seq %lld\n", 620 inode, page, page->index, page_off, len, snapc, snapc->seq); 621 622 writeback_stat = atomic_long_inc_return(&fsc->writeback_count); 623 if (writeback_stat > 624 CONGESTION_ON_THRESH(fsc->mount_options->congestion_kb)) 625 set_bdi_congested(inode_to_bdi(inode), BLK_RW_ASYNC); 626 627 set_page_writeback(page); 628 err = ceph_osdc_writepages(&fsc->client->osdc, ceph_vino(inode), 629 &ci->i_layout, snapc, page_off, len, 630 ceph_wbc.truncate_seq, 631 ceph_wbc.truncate_size, 632 &inode->i_mtime, &page, 1); 633 if (err < 0) { 634 struct writeback_control tmp_wbc; 635 if (!wbc) 636 wbc = &tmp_wbc; 637 if (err == -ERESTARTSYS) { 638 /* killed by SIGKILL */ 639 dout("writepage interrupted page %p\n", page); 640 redirty_page_for_writepage(wbc, page); 641 end_page_writeback(page); 642 return err; 643 } 644 dout("writepage setting page/mapping error %d %p\n", 645 err, page); 646 SetPageError(page); 647 mapping_set_error(&inode->i_data, err); 648 wbc->pages_skipped++; 649 } else { 650 dout("writepage cleaned page %p\n", page); 651 err = 0; /* vfs expects us to return 0 */ 652 } 653 page->private = 0; 654 ClearPagePrivate(page); 655 end_page_writeback(page); 656 ceph_put_wrbuffer_cap_refs(ci, 1, snapc); 657 ceph_put_snap_context(snapc); /* page's reference */ 658 return err; 659 } 660 661 static int ceph_writepage(struct page *page, struct writeback_control *wbc) 662 { 663 int err; 664 struct inode *inode = page->mapping->host; 665 BUG_ON(!inode); 666 ihold(inode); 667 err = writepage_nounlock(page, wbc); 668 if (err == -ERESTARTSYS) { 669 /* direct memory reclaimer was killed by SIGKILL. return 0 670 * to prevent caller from setting mapping/page error */ 671 err = 0; 672 } 673 unlock_page(page); 674 iput(inode); 675 return err; 676 } 677 678 /* 679 * lame release_pages helper. release_pages() isn't exported to 680 * modules. 681 */ 682 static void ceph_release_pages(struct page **pages, int num) 683 { 684 struct pagevec pvec; 685 int i; 686 687 pagevec_init(&pvec); 688 for (i = 0; i < num; i++) { 689 if (pagevec_add(&pvec, pages[i]) == 0) 690 pagevec_release(&pvec); 691 } 692 pagevec_release(&pvec); 693 } 694 695 /* 696 * async writeback completion handler. 697 * 698 * If we get an error, set the mapping error bit, but not the individual 699 * page error bits. 700 */ 701 static void writepages_finish(struct ceph_osd_request *req) 702 { 703 struct inode *inode = req->r_inode; 704 struct ceph_inode_info *ci = ceph_inode(inode); 705 struct ceph_osd_data *osd_data; 706 struct page *page; 707 int num_pages, total_pages = 0; 708 int i, j; 709 int rc = req->r_result; 710 struct ceph_snap_context *snapc = req->r_snapc; 711 struct address_space *mapping = inode->i_mapping; 712 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 713 bool remove_page; 714 715 dout("writepages_finish %p rc %d\n", inode, rc); 716 if (rc < 0) { 717 mapping_set_error(mapping, rc); 718 ceph_set_error_write(ci); 719 } else { 720 ceph_clear_error_write(ci); 721 } 722 723 /* 724 * We lost the cache cap, need to truncate the page before 725 * it is unlocked, otherwise we'd truncate it later in the 726 * page truncation thread, possibly losing some data that 727 * raced its way in 728 */ 729 remove_page = !(ceph_caps_issued(ci) & 730 (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)); 731 732 /* clean all pages */ 733 for (i = 0; i < req->r_num_ops; i++) { 734 if (req->r_ops[i].op != CEPH_OSD_OP_WRITE) 735 break; 736 737 osd_data = osd_req_op_extent_osd_data(req, i); 738 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES); 739 num_pages = calc_pages_for((u64)osd_data->alignment, 740 (u64)osd_data->length); 741 total_pages += num_pages; 742 for (j = 0; j < num_pages; j++) { 743 page = osd_data->pages[j]; 744 BUG_ON(!page); 745 WARN_ON(!PageUptodate(page)); 746 747 if (atomic_long_dec_return(&fsc->writeback_count) < 748 CONGESTION_OFF_THRESH( 749 fsc->mount_options->congestion_kb)) 750 clear_bdi_congested(inode_to_bdi(inode), 751 BLK_RW_ASYNC); 752 753 ceph_put_snap_context(page_snap_context(page)); 754 page->private = 0; 755 ClearPagePrivate(page); 756 dout("unlocking %p\n", page); 757 end_page_writeback(page); 758 759 if (remove_page) 760 generic_error_remove_page(inode->i_mapping, 761 page); 762 763 unlock_page(page); 764 } 765 dout("writepages_finish %p wrote %llu bytes cleaned %d pages\n", 766 inode, osd_data->length, rc >= 0 ? num_pages : 0); 767 768 ceph_release_pages(osd_data->pages, num_pages); 769 } 770 771 ceph_put_wrbuffer_cap_refs(ci, total_pages, snapc); 772 773 osd_data = osd_req_op_extent_osd_data(req, 0); 774 if (osd_data->pages_from_pool) 775 mempool_free(osd_data->pages, 776 ceph_sb_to_client(inode->i_sb)->wb_pagevec_pool); 777 else 778 kfree(osd_data->pages); 779 ceph_osdc_put_request(req); 780 } 781 782 /* 783 * initiate async writeback 784 */ 785 static int ceph_writepages_start(struct address_space *mapping, 786 struct writeback_control *wbc) 787 { 788 struct inode *inode = mapping->host; 789 struct ceph_inode_info *ci = ceph_inode(inode); 790 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 791 struct ceph_vino vino = ceph_vino(inode); 792 pgoff_t index, start_index, end = -1; 793 struct ceph_snap_context *snapc = NULL, *last_snapc = NULL, *pgsnapc; 794 struct pagevec pvec; 795 int rc = 0; 796 unsigned int wsize = i_blocksize(inode); 797 struct ceph_osd_request *req = NULL; 798 struct ceph_writeback_ctl ceph_wbc; 799 bool should_loop, range_whole = false; 800 bool stop, done = false; 801 802 dout("writepages_start %p (mode=%s)\n", inode, 803 wbc->sync_mode == WB_SYNC_NONE ? "NONE" : 804 (wbc->sync_mode == WB_SYNC_ALL ? "ALL" : "HOLD")); 805 806 if (READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) { 807 if (ci->i_wrbuffer_ref > 0) { 808 pr_warn_ratelimited( 809 "writepage_start %p %lld forced umount\n", 810 inode, ceph_ino(inode)); 811 } 812 mapping_set_error(mapping, -EIO); 813 return -EIO; /* we're in a forced umount, don't write! */ 814 } 815 if (fsc->mount_options->wsize < wsize) 816 wsize = fsc->mount_options->wsize; 817 818 pagevec_init(&pvec); 819 820 start_index = wbc->range_cyclic ? mapping->writeback_index : 0; 821 index = start_index; 822 823 retry: 824 /* find oldest snap context with dirty data */ 825 snapc = get_oldest_context(inode, &ceph_wbc, NULL); 826 if (!snapc) { 827 /* hmm, why does writepages get called when there 828 is no dirty data? */ 829 dout(" no snap context with dirty data?\n"); 830 goto out; 831 } 832 dout(" oldest snapc is %p seq %lld (%d snaps)\n", 833 snapc, snapc->seq, snapc->num_snaps); 834 835 should_loop = false; 836 if (ceph_wbc.head_snapc && snapc != last_snapc) { 837 /* where to start/end? */ 838 if (wbc->range_cyclic) { 839 index = start_index; 840 end = -1; 841 if (index > 0) 842 should_loop = true; 843 dout(" cyclic, start at %lu\n", index); 844 } else { 845 index = wbc->range_start >> PAGE_SHIFT; 846 end = wbc->range_end >> PAGE_SHIFT; 847 if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) 848 range_whole = true; 849 dout(" not cyclic, %lu to %lu\n", index, end); 850 } 851 } else if (!ceph_wbc.head_snapc) { 852 /* Do not respect wbc->range_{start,end}. Dirty pages 853 * in that range can be associated with newer snapc. 854 * They are not writeable until we write all dirty pages 855 * associated with 'snapc' get written */ 856 if (index > 0 || wbc->sync_mode != WB_SYNC_NONE) 857 should_loop = true; 858 dout(" non-head snapc, range whole\n"); 859 } 860 861 ceph_put_snap_context(last_snapc); 862 last_snapc = snapc; 863 864 stop = false; 865 while (!stop && index <= end) { 866 int num_ops = 0, op_idx; 867 unsigned i, pvec_pages, max_pages, locked_pages = 0; 868 struct page **pages = NULL, **data_pages; 869 mempool_t *pool = NULL; /* Becomes non-null if mempool used */ 870 struct page *page; 871 pgoff_t strip_unit_end = 0; 872 u64 offset = 0, len = 0; 873 874 max_pages = wsize >> PAGE_SHIFT; 875 876 get_more_pages: 877 pvec_pages = pagevec_lookup_range_nr_tag(&pvec, mapping, &index, 878 end, PAGECACHE_TAG_DIRTY, 879 max_pages - locked_pages); 880 dout("pagevec_lookup_range_tag got %d\n", pvec_pages); 881 if (!pvec_pages && !locked_pages) 882 break; 883 for (i = 0; i < pvec_pages && locked_pages < max_pages; i++) { 884 page = pvec.pages[i]; 885 dout("? %p idx %lu\n", page, page->index); 886 if (locked_pages == 0) 887 lock_page(page); /* first page */ 888 else if (!trylock_page(page)) 889 break; 890 891 /* only dirty pages, or our accounting breaks */ 892 if (unlikely(!PageDirty(page)) || 893 unlikely(page->mapping != mapping)) { 894 dout("!dirty or !mapping %p\n", page); 895 unlock_page(page); 896 continue; 897 } 898 if (strip_unit_end && (page->index > strip_unit_end)) { 899 dout("end of strip unit %p\n", page); 900 unlock_page(page); 901 break; 902 } 903 if (page_offset(page) >= ceph_wbc.i_size) { 904 dout("%p page eof %llu\n", 905 page, ceph_wbc.i_size); 906 /* not done if range_cyclic */ 907 stop = true; 908 unlock_page(page); 909 break; 910 } 911 if (PageWriteback(page)) { 912 if (wbc->sync_mode == WB_SYNC_NONE) { 913 dout("%p under writeback\n", page); 914 unlock_page(page); 915 continue; 916 } 917 dout("waiting on writeback %p\n", page); 918 wait_on_page_writeback(page); 919 } 920 921 /* only if matching snap context */ 922 pgsnapc = page_snap_context(page); 923 if (pgsnapc != snapc) { 924 dout("page snapc %p %lld != oldest %p %lld\n", 925 pgsnapc, pgsnapc->seq, snapc, snapc->seq); 926 unlock_page(page); 927 continue; 928 } 929 930 if (!clear_page_dirty_for_io(page)) { 931 dout("%p !clear_page_dirty_for_io\n", page); 932 unlock_page(page); 933 continue; 934 } 935 936 /* 937 * We have something to write. If this is 938 * the first locked page this time through, 939 * calculate max possinle write size and 940 * allocate a page array 941 */ 942 if (locked_pages == 0) { 943 u64 objnum; 944 u64 objoff; 945 946 /* prepare async write request */ 947 offset = (u64)page_offset(page); 948 len = wsize; 949 950 rc = ceph_calc_file_object_mapping(&ci->i_layout, 951 offset, len, 952 &objnum, &objoff, 953 &len); 954 if (rc < 0) { 955 unlock_page(page); 956 break; 957 } 958 959 num_ops = 1; 960 strip_unit_end = page->index + 961 ((len - 1) >> PAGE_SHIFT); 962 963 BUG_ON(pages); 964 max_pages = calc_pages_for(0, (u64)len); 965 pages = kmalloc(max_pages * sizeof (*pages), 966 GFP_NOFS); 967 if (!pages) { 968 pool = fsc->wb_pagevec_pool; 969 pages = mempool_alloc(pool, GFP_NOFS); 970 BUG_ON(!pages); 971 } 972 973 len = 0; 974 } else if (page->index != 975 (offset + len) >> PAGE_SHIFT) { 976 if (num_ops >= (pool ? CEPH_OSD_SLAB_OPS : 977 CEPH_OSD_MAX_OPS)) { 978 redirty_page_for_writepage(wbc, page); 979 unlock_page(page); 980 break; 981 } 982 983 num_ops++; 984 offset = (u64)page_offset(page); 985 len = 0; 986 } 987 988 /* note position of first page in pvec */ 989 dout("%p will write page %p idx %lu\n", 990 inode, page, page->index); 991 992 if (atomic_long_inc_return(&fsc->writeback_count) > 993 CONGESTION_ON_THRESH( 994 fsc->mount_options->congestion_kb)) { 995 set_bdi_congested(inode_to_bdi(inode), 996 BLK_RW_ASYNC); 997 } 998 999 1000 pages[locked_pages++] = page; 1001 pvec.pages[i] = NULL; 1002 1003 len += PAGE_SIZE; 1004 } 1005 1006 /* did we get anything? */ 1007 if (!locked_pages) 1008 goto release_pvec_pages; 1009 if (i) { 1010 unsigned j, n = 0; 1011 /* shift unused page to beginning of pvec */ 1012 for (j = 0; j < pvec_pages; j++) { 1013 if (!pvec.pages[j]) 1014 continue; 1015 if (n < j) 1016 pvec.pages[n] = pvec.pages[j]; 1017 n++; 1018 } 1019 pvec.nr = n; 1020 1021 if (pvec_pages && i == pvec_pages && 1022 locked_pages < max_pages) { 1023 dout("reached end pvec, trying for more\n"); 1024 pagevec_release(&pvec); 1025 goto get_more_pages; 1026 } 1027 } 1028 1029 new_request: 1030 offset = page_offset(pages[0]); 1031 len = wsize; 1032 1033 req = ceph_osdc_new_request(&fsc->client->osdc, 1034 &ci->i_layout, vino, 1035 offset, &len, 0, num_ops, 1036 CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE, 1037 snapc, ceph_wbc.truncate_seq, 1038 ceph_wbc.truncate_size, false); 1039 if (IS_ERR(req)) { 1040 req = ceph_osdc_new_request(&fsc->client->osdc, 1041 &ci->i_layout, vino, 1042 offset, &len, 0, 1043 min(num_ops, 1044 CEPH_OSD_SLAB_OPS), 1045 CEPH_OSD_OP_WRITE, 1046 CEPH_OSD_FLAG_WRITE, 1047 snapc, ceph_wbc.truncate_seq, 1048 ceph_wbc.truncate_size, true); 1049 BUG_ON(IS_ERR(req)); 1050 } 1051 BUG_ON(len < page_offset(pages[locked_pages - 1]) + 1052 PAGE_SIZE - offset); 1053 1054 req->r_callback = writepages_finish; 1055 req->r_inode = inode; 1056 1057 /* Format the osd request message and submit the write */ 1058 len = 0; 1059 data_pages = pages; 1060 op_idx = 0; 1061 for (i = 0; i < locked_pages; i++) { 1062 u64 cur_offset = page_offset(pages[i]); 1063 if (offset + len != cur_offset) { 1064 if (op_idx + 1 == req->r_num_ops) 1065 break; 1066 osd_req_op_extent_dup_last(req, op_idx, 1067 cur_offset - offset); 1068 dout("writepages got pages at %llu~%llu\n", 1069 offset, len); 1070 osd_req_op_extent_osd_data_pages(req, op_idx, 1071 data_pages, len, 0, 1072 !!pool, false); 1073 osd_req_op_extent_update(req, op_idx, len); 1074 1075 len = 0; 1076 offset = cur_offset; 1077 data_pages = pages + i; 1078 op_idx++; 1079 } 1080 1081 set_page_writeback(pages[i]); 1082 len += PAGE_SIZE; 1083 } 1084 1085 if (ceph_wbc.size_stable) { 1086 len = min(len, ceph_wbc.i_size - offset); 1087 } else if (i == locked_pages) { 1088 /* writepages_finish() clears writeback pages 1089 * according to the data length, so make sure 1090 * data length covers all locked pages */ 1091 u64 min_len = len + 1 - PAGE_SIZE; 1092 len = get_writepages_data_length(inode, pages[i - 1], 1093 offset); 1094 len = max(len, min_len); 1095 } 1096 dout("writepages got pages at %llu~%llu\n", offset, len); 1097 1098 osd_req_op_extent_osd_data_pages(req, op_idx, data_pages, len, 1099 0, !!pool, false); 1100 osd_req_op_extent_update(req, op_idx, len); 1101 1102 BUG_ON(op_idx + 1 != req->r_num_ops); 1103 1104 pool = NULL; 1105 if (i < locked_pages) { 1106 BUG_ON(num_ops <= req->r_num_ops); 1107 num_ops -= req->r_num_ops; 1108 locked_pages -= i; 1109 1110 /* allocate new pages array for next request */ 1111 data_pages = pages; 1112 pages = kmalloc(locked_pages * sizeof (*pages), 1113 GFP_NOFS); 1114 if (!pages) { 1115 pool = fsc->wb_pagevec_pool; 1116 pages = mempool_alloc(pool, GFP_NOFS); 1117 BUG_ON(!pages); 1118 } 1119 memcpy(pages, data_pages + i, 1120 locked_pages * sizeof(*pages)); 1121 memset(data_pages + i, 0, 1122 locked_pages * sizeof(*pages)); 1123 } else { 1124 BUG_ON(num_ops != req->r_num_ops); 1125 index = pages[i - 1]->index + 1; 1126 /* request message now owns the pages array */ 1127 pages = NULL; 1128 } 1129 1130 req->r_mtime = inode->i_mtime; 1131 rc = ceph_osdc_start_request(&fsc->client->osdc, req, true); 1132 BUG_ON(rc); 1133 req = NULL; 1134 1135 wbc->nr_to_write -= i; 1136 if (pages) 1137 goto new_request; 1138 1139 /* 1140 * We stop writing back only if we are not doing 1141 * integrity sync. In case of integrity sync we have to 1142 * keep going until we have written all the pages 1143 * we tagged for writeback prior to entering this loop. 1144 */ 1145 if (wbc->nr_to_write <= 0 && wbc->sync_mode == WB_SYNC_NONE) 1146 done = stop = true; 1147 1148 release_pvec_pages: 1149 dout("pagevec_release on %d pages (%p)\n", (int)pvec.nr, 1150 pvec.nr ? pvec.pages[0] : NULL); 1151 pagevec_release(&pvec); 1152 } 1153 1154 if (should_loop && !done) { 1155 /* more to do; loop back to beginning of file */ 1156 dout("writepages looping back to beginning of file\n"); 1157 end = start_index - 1; /* OK even when start_index == 0 */ 1158 1159 /* to write dirty pages associated with next snapc, 1160 * we need to wait until current writes complete */ 1161 if (wbc->sync_mode != WB_SYNC_NONE && 1162 start_index == 0 && /* all dirty pages were checked */ 1163 !ceph_wbc.head_snapc) { 1164 struct page *page; 1165 unsigned i, nr; 1166 index = 0; 1167 while ((index <= end) && 1168 (nr = pagevec_lookup_tag(&pvec, mapping, &index, 1169 PAGECACHE_TAG_WRITEBACK))) { 1170 for (i = 0; i < nr; i++) { 1171 page = pvec.pages[i]; 1172 if (page_snap_context(page) != snapc) 1173 continue; 1174 wait_on_page_writeback(page); 1175 } 1176 pagevec_release(&pvec); 1177 cond_resched(); 1178 } 1179 } 1180 1181 start_index = 0; 1182 index = 0; 1183 goto retry; 1184 } 1185 1186 if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) 1187 mapping->writeback_index = index; 1188 1189 out: 1190 ceph_osdc_put_request(req); 1191 ceph_put_snap_context(last_snapc); 1192 dout("writepages dend - startone, rc = %d\n", rc); 1193 return rc; 1194 } 1195 1196 1197 1198 /* 1199 * See if a given @snapc is either writeable, or already written. 1200 */ 1201 static int context_is_writeable_or_written(struct inode *inode, 1202 struct ceph_snap_context *snapc) 1203 { 1204 struct ceph_snap_context *oldest = get_oldest_context(inode, NULL, NULL); 1205 int ret = !oldest || snapc->seq <= oldest->seq; 1206 1207 ceph_put_snap_context(oldest); 1208 return ret; 1209 } 1210 1211 /* 1212 * We are only allowed to write into/dirty the page if the page is 1213 * clean, or already dirty within the same snap context. 1214 * 1215 * called with page locked. 1216 * return success with page locked, 1217 * or any failure (incl -EAGAIN) with page unlocked. 1218 */ 1219 static int ceph_update_writeable_page(struct file *file, 1220 loff_t pos, unsigned len, 1221 struct page *page) 1222 { 1223 struct inode *inode = file_inode(file); 1224 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 1225 struct ceph_inode_info *ci = ceph_inode(inode); 1226 loff_t page_off = pos & PAGE_MASK; 1227 int pos_in_page = pos & ~PAGE_MASK; 1228 int end_in_page = pos_in_page + len; 1229 loff_t i_size; 1230 int r; 1231 struct ceph_snap_context *snapc, *oldest; 1232 1233 if (READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) { 1234 dout(" page %p forced umount\n", page); 1235 unlock_page(page); 1236 return -EIO; 1237 } 1238 1239 retry_locked: 1240 /* writepages currently holds page lock, but if we change that later, */ 1241 wait_on_page_writeback(page); 1242 1243 snapc = page_snap_context(page); 1244 if (snapc && snapc != ci->i_head_snapc) { 1245 /* 1246 * this page is already dirty in another (older) snap 1247 * context! is it writeable now? 1248 */ 1249 oldest = get_oldest_context(inode, NULL, NULL); 1250 if (snapc->seq > oldest->seq) { 1251 ceph_put_snap_context(oldest); 1252 dout(" page %p snapc %p not current or oldest\n", 1253 page, snapc); 1254 /* 1255 * queue for writeback, and wait for snapc to 1256 * be writeable or written 1257 */ 1258 snapc = ceph_get_snap_context(snapc); 1259 unlock_page(page); 1260 ceph_queue_writeback(inode); 1261 r = wait_event_killable(ci->i_cap_wq, 1262 context_is_writeable_or_written(inode, snapc)); 1263 ceph_put_snap_context(snapc); 1264 if (r == -ERESTARTSYS) 1265 return r; 1266 return -EAGAIN; 1267 } 1268 ceph_put_snap_context(oldest); 1269 1270 /* yay, writeable, do it now (without dropping page lock) */ 1271 dout(" page %p snapc %p not current, but oldest\n", 1272 page, snapc); 1273 if (!clear_page_dirty_for_io(page)) 1274 goto retry_locked; 1275 r = writepage_nounlock(page, NULL); 1276 if (r < 0) 1277 goto fail_unlock; 1278 goto retry_locked; 1279 } 1280 1281 if (PageUptodate(page)) { 1282 dout(" page %p already uptodate\n", page); 1283 return 0; 1284 } 1285 1286 /* full page? */ 1287 if (pos_in_page == 0 && len == PAGE_SIZE) 1288 return 0; 1289 1290 /* past end of file? */ 1291 i_size = i_size_read(inode); 1292 1293 if (page_off >= i_size || 1294 (pos_in_page == 0 && (pos+len) >= i_size && 1295 end_in_page - pos_in_page != PAGE_SIZE)) { 1296 dout(" zeroing %p 0 - %d and %d - %d\n", 1297 page, pos_in_page, end_in_page, (int)PAGE_SIZE); 1298 zero_user_segments(page, 1299 0, pos_in_page, 1300 end_in_page, PAGE_SIZE); 1301 return 0; 1302 } 1303 1304 /* we need to read it. */ 1305 r = ceph_do_readpage(file, page); 1306 if (r < 0) { 1307 if (r == -EINPROGRESS) 1308 return -EAGAIN; 1309 goto fail_unlock; 1310 } 1311 goto retry_locked; 1312 fail_unlock: 1313 unlock_page(page); 1314 return r; 1315 } 1316 1317 /* 1318 * We are only allowed to write into/dirty the page if the page is 1319 * clean, or already dirty within the same snap context. 1320 */ 1321 static int ceph_write_begin(struct file *file, struct address_space *mapping, 1322 loff_t pos, unsigned len, unsigned flags, 1323 struct page **pagep, void **fsdata) 1324 { 1325 struct inode *inode = file_inode(file); 1326 struct page *page; 1327 pgoff_t index = pos >> PAGE_SHIFT; 1328 int r; 1329 1330 do { 1331 /* get a page */ 1332 page = grab_cache_page_write_begin(mapping, index, 0); 1333 if (!page) 1334 return -ENOMEM; 1335 1336 dout("write_begin file %p inode %p page %p %d~%d\n", file, 1337 inode, page, (int)pos, (int)len); 1338 1339 r = ceph_update_writeable_page(file, pos, len, page); 1340 if (r < 0) 1341 put_page(page); 1342 else 1343 *pagep = page; 1344 } while (r == -EAGAIN); 1345 1346 return r; 1347 } 1348 1349 /* 1350 * we don't do anything in here that simple_write_end doesn't do 1351 * except adjust dirty page accounting 1352 */ 1353 static int ceph_write_end(struct file *file, struct address_space *mapping, 1354 loff_t pos, unsigned len, unsigned copied, 1355 struct page *page, void *fsdata) 1356 { 1357 struct inode *inode = file_inode(file); 1358 bool check_cap = false; 1359 1360 dout("write_end file %p inode %p page %p %d~%d (%d)\n", file, 1361 inode, page, (int)pos, (int)copied, (int)len); 1362 1363 /* zero the stale part of the page if we did a short copy */ 1364 if (!PageUptodate(page)) { 1365 if (copied < len) { 1366 copied = 0; 1367 goto out; 1368 } 1369 SetPageUptodate(page); 1370 } 1371 1372 /* did file size increase? */ 1373 if (pos+copied > i_size_read(inode)) 1374 check_cap = ceph_inode_set_size(inode, pos+copied); 1375 1376 set_page_dirty(page); 1377 1378 out: 1379 unlock_page(page); 1380 put_page(page); 1381 1382 if (check_cap) 1383 ceph_check_caps(ceph_inode(inode), CHECK_CAPS_AUTHONLY, NULL); 1384 1385 return copied; 1386 } 1387 1388 /* 1389 * we set .direct_IO to indicate direct io is supported, but since we 1390 * intercept O_DIRECT reads and writes early, this function should 1391 * never get called. 1392 */ 1393 static ssize_t ceph_direct_io(struct kiocb *iocb, struct iov_iter *iter) 1394 { 1395 WARN_ON(1); 1396 return -EINVAL; 1397 } 1398 1399 const struct address_space_operations ceph_aops = { 1400 .readpage = ceph_readpage, 1401 .readpages = ceph_readpages, 1402 .writepage = ceph_writepage, 1403 .writepages = ceph_writepages_start, 1404 .write_begin = ceph_write_begin, 1405 .write_end = ceph_write_end, 1406 .set_page_dirty = ceph_set_page_dirty, 1407 .invalidatepage = ceph_invalidatepage, 1408 .releasepage = ceph_releasepage, 1409 .direct_IO = ceph_direct_io, 1410 }; 1411 1412 static void ceph_block_sigs(sigset_t *oldset) 1413 { 1414 sigset_t mask; 1415 siginitsetinv(&mask, sigmask(SIGKILL)); 1416 sigprocmask(SIG_BLOCK, &mask, oldset); 1417 } 1418 1419 static void ceph_restore_sigs(sigset_t *oldset) 1420 { 1421 sigprocmask(SIG_SETMASK, oldset, NULL); 1422 } 1423 1424 /* 1425 * vm ops 1426 */ 1427 static int ceph_filemap_fault(struct vm_fault *vmf) 1428 { 1429 struct vm_area_struct *vma = vmf->vma; 1430 struct inode *inode = file_inode(vma->vm_file); 1431 struct ceph_inode_info *ci = ceph_inode(inode); 1432 struct ceph_file_info *fi = vma->vm_file->private_data; 1433 struct page *pinned_page = NULL; 1434 loff_t off = vmf->pgoff << PAGE_SHIFT; 1435 int want, got, ret; 1436 sigset_t oldset; 1437 1438 ceph_block_sigs(&oldset); 1439 1440 dout("filemap_fault %p %llx.%llx %llu~%zd trying to get caps\n", 1441 inode, ceph_vinop(inode), off, (size_t)PAGE_SIZE); 1442 if (fi->fmode & CEPH_FILE_MODE_LAZY) 1443 want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO; 1444 else 1445 want = CEPH_CAP_FILE_CACHE; 1446 1447 got = 0; 1448 ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, -1, &got, &pinned_page); 1449 if (ret < 0) 1450 goto out_restore; 1451 1452 dout("filemap_fault %p %llu~%zd got cap refs on %s\n", 1453 inode, off, (size_t)PAGE_SIZE, ceph_cap_string(got)); 1454 1455 if ((got & (CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO)) || 1456 ci->i_inline_version == CEPH_INLINE_NONE) { 1457 CEPH_DEFINE_RW_CONTEXT(rw_ctx, got); 1458 ceph_add_rw_context(fi, &rw_ctx); 1459 ret = filemap_fault(vmf); 1460 ceph_del_rw_context(fi, &rw_ctx); 1461 } else 1462 ret = -EAGAIN; 1463 1464 dout("filemap_fault %p %llu~%zd dropping cap refs on %s ret %d\n", 1465 inode, off, (size_t)PAGE_SIZE, ceph_cap_string(got), ret); 1466 if (pinned_page) 1467 put_page(pinned_page); 1468 ceph_put_cap_refs(ci, got); 1469 1470 if (ret != -EAGAIN) 1471 goto out_restore; 1472 1473 /* read inline data */ 1474 if (off >= PAGE_SIZE) { 1475 /* does not support inline data > PAGE_SIZE */ 1476 ret = VM_FAULT_SIGBUS; 1477 } else { 1478 int ret1; 1479 struct address_space *mapping = inode->i_mapping; 1480 struct page *page = find_or_create_page(mapping, 0, 1481 mapping_gfp_constraint(mapping, 1482 ~__GFP_FS)); 1483 if (!page) { 1484 ret = VM_FAULT_OOM; 1485 goto out_inline; 1486 } 1487 ret1 = __ceph_do_getattr(inode, page, 1488 CEPH_STAT_CAP_INLINE_DATA, true); 1489 if (ret1 < 0 || off >= i_size_read(inode)) { 1490 unlock_page(page); 1491 put_page(page); 1492 if (ret1 < 0) 1493 ret = ret1; 1494 else 1495 ret = VM_FAULT_SIGBUS; 1496 goto out_inline; 1497 } 1498 if (ret1 < PAGE_SIZE) 1499 zero_user_segment(page, ret1, PAGE_SIZE); 1500 else 1501 flush_dcache_page(page); 1502 SetPageUptodate(page); 1503 vmf->page = page; 1504 ret = VM_FAULT_MAJOR | VM_FAULT_LOCKED; 1505 out_inline: 1506 dout("filemap_fault %p %llu~%zd read inline data ret %d\n", 1507 inode, off, (size_t)PAGE_SIZE, ret); 1508 } 1509 out_restore: 1510 ceph_restore_sigs(&oldset); 1511 if (ret < 0) 1512 ret = (ret == -ENOMEM) ? VM_FAULT_OOM : VM_FAULT_SIGBUS; 1513 1514 return ret; 1515 } 1516 1517 /* 1518 * Reuse write_begin here for simplicity. 1519 */ 1520 static int ceph_page_mkwrite(struct vm_fault *vmf) 1521 { 1522 struct vm_area_struct *vma = vmf->vma; 1523 struct inode *inode = file_inode(vma->vm_file); 1524 struct ceph_inode_info *ci = ceph_inode(inode); 1525 struct ceph_file_info *fi = vma->vm_file->private_data; 1526 struct ceph_cap_flush *prealloc_cf; 1527 struct page *page = vmf->page; 1528 loff_t off = page_offset(page); 1529 loff_t size = i_size_read(inode); 1530 size_t len; 1531 int want, got, ret; 1532 sigset_t oldset; 1533 1534 prealloc_cf = ceph_alloc_cap_flush(); 1535 if (!prealloc_cf) 1536 return VM_FAULT_OOM; 1537 1538 ceph_block_sigs(&oldset); 1539 1540 if (ci->i_inline_version != CEPH_INLINE_NONE) { 1541 struct page *locked_page = NULL; 1542 if (off == 0) { 1543 lock_page(page); 1544 locked_page = page; 1545 } 1546 ret = ceph_uninline_data(vma->vm_file, locked_page); 1547 if (locked_page) 1548 unlock_page(locked_page); 1549 if (ret < 0) 1550 goto out_free; 1551 } 1552 1553 if (off + PAGE_SIZE <= size) 1554 len = PAGE_SIZE; 1555 else 1556 len = size & ~PAGE_MASK; 1557 1558 dout("page_mkwrite %p %llx.%llx %llu~%zd getting caps i_size %llu\n", 1559 inode, ceph_vinop(inode), off, len, size); 1560 if (fi->fmode & CEPH_FILE_MODE_LAZY) 1561 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO; 1562 else 1563 want = CEPH_CAP_FILE_BUFFER; 1564 1565 got = 0; 1566 ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, off + len, 1567 &got, NULL); 1568 if (ret < 0) 1569 goto out_free; 1570 1571 dout("page_mkwrite %p %llu~%zd got cap refs on %s\n", 1572 inode, off, len, ceph_cap_string(got)); 1573 1574 /* Update time before taking page lock */ 1575 file_update_time(vma->vm_file); 1576 1577 do { 1578 lock_page(page); 1579 1580 if ((off > size) || (page->mapping != inode->i_mapping)) { 1581 unlock_page(page); 1582 ret = VM_FAULT_NOPAGE; 1583 break; 1584 } 1585 1586 ret = ceph_update_writeable_page(vma->vm_file, off, len, page); 1587 if (ret >= 0) { 1588 /* success. we'll keep the page locked. */ 1589 set_page_dirty(page); 1590 ret = VM_FAULT_LOCKED; 1591 } 1592 } while (ret == -EAGAIN); 1593 1594 if (ret == VM_FAULT_LOCKED || 1595 ci->i_inline_version != CEPH_INLINE_NONE) { 1596 int dirty; 1597 spin_lock(&ci->i_ceph_lock); 1598 ci->i_inline_version = CEPH_INLINE_NONE; 1599 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR, 1600 &prealloc_cf); 1601 spin_unlock(&ci->i_ceph_lock); 1602 if (dirty) 1603 __mark_inode_dirty(inode, dirty); 1604 } 1605 1606 dout("page_mkwrite %p %llu~%zd dropping cap refs on %s ret %d\n", 1607 inode, off, len, ceph_cap_string(got), ret); 1608 ceph_put_cap_refs(ci, got); 1609 out_free: 1610 ceph_restore_sigs(&oldset); 1611 ceph_free_cap_flush(prealloc_cf); 1612 if (ret < 0) 1613 ret = (ret == -ENOMEM) ? VM_FAULT_OOM : VM_FAULT_SIGBUS; 1614 return ret; 1615 } 1616 1617 void ceph_fill_inline_data(struct inode *inode, struct page *locked_page, 1618 char *data, size_t len) 1619 { 1620 struct address_space *mapping = inode->i_mapping; 1621 struct page *page; 1622 1623 if (locked_page) { 1624 page = locked_page; 1625 } else { 1626 if (i_size_read(inode) == 0) 1627 return; 1628 page = find_or_create_page(mapping, 0, 1629 mapping_gfp_constraint(mapping, 1630 ~__GFP_FS)); 1631 if (!page) 1632 return; 1633 if (PageUptodate(page)) { 1634 unlock_page(page); 1635 put_page(page); 1636 return; 1637 } 1638 } 1639 1640 dout("fill_inline_data %p %llx.%llx len %zu locked_page %p\n", 1641 inode, ceph_vinop(inode), len, locked_page); 1642 1643 if (len > 0) { 1644 void *kaddr = kmap_atomic(page); 1645 memcpy(kaddr, data, len); 1646 kunmap_atomic(kaddr); 1647 } 1648 1649 if (page != locked_page) { 1650 if (len < PAGE_SIZE) 1651 zero_user_segment(page, len, PAGE_SIZE); 1652 else 1653 flush_dcache_page(page); 1654 1655 SetPageUptodate(page); 1656 unlock_page(page); 1657 put_page(page); 1658 } 1659 } 1660 1661 int ceph_uninline_data(struct file *filp, struct page *locked_page) 1662 { 1663 struct inode *inode = file_inode(filp); 1664 struct ceph_inode_info *ci = ceph_inode(inode); 1665 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 1666 struct ceph_osd_request *req; 1667 struct page *page = NULL; 1668 u64 len, inline_version; 1669 int err = 0; 1670 bool from_pagecache = false; 1671 1672 spin_lock(&ci->i_ceph_lock); 1673 inline_version = ci->i_inline_version; 1674 spin_unlock(&ci->i_ceph_lock); 1675 1676 dout("uninline_data %p %llx.%llx inline_version %llu\n", 1677 inode, ceph_vinop(inode), inline_version); 1678 1679 if (inline_version == 1 || /* initial version, no data */ 1680 inline_version == CEPH_INLINE_NONE) 1681 goto out; 1682 1683 if (locked_page) { 1684 page = locked_page; 1685 WARN_ON(!PageUptodate(page)); 1686 } else if (ceph_caps_issued(ci) & 1687 (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) { 1688 page = find_get_page(inode->i_mapping, 0); 1689 if (page) { 1690 if (PageUptodate(page)) { 1691 from_pagecache = true; 1692 lock_page(page); 1693 } else { 1694 put_page(page); 1695 page = NULL; 1696 } 1697 } 1698 } 1699 1700 if (page) { 1701 len = i_size_read(inode); 1702 if (len > PAGE_SIZE) 1703 len = PAGE_SIZE; 1704 } else { 1705 page = __page_cache_alloc(GFP_NOFS); 1706 if (!page) { 1707 err = -ENOMEM; 1708 goto out; 1709 } 1710 err = __ceph_do_getattr(inode, page, 1711 CEPH_STAT_CAP_INLINE_DATA, true); 1712 if (err < 0) { 1713 /* no inline data */ 1714 if (err == -ENODATA) 1715 err = 0; 1716 goto out; 1717 } 1718 len = err; 1719 } 1720 1721 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, 1722 ceph_vino(inode), 0, &len, 0, 1, 1723 CEPH_OSD_OP_CREATE, CEPH_OSD_FLAG_WRITE, 1724 NULL, 0, 0, false); 1725 if (IS_ERR(req)) { 1726 err = PTR_ERR(req); 1727 goto out; 1728 } 1729 1730 req->r_mtime = inode->i_mtime; 1731 err = ceph_osdc_start_request(&fsc->client->osdc, req, false); 1732 if (!err) 1733 err = ceph_osdc_wait_request(&fsc->client->osdc, req); 1734 ceph_osdc_put_request(req); 1735 if (err < 0) 1736 goto out; 1737 1738 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, 1739 ceph_vino(inode), 0, &len, 1, 3, 1740 CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE, 1741 NULL, ci->i_truncate_seq, 1742 ci->i_truncate_size, false); 1743 if (IS_ERR(req)) { 1744 err = PTR_ERR(req); 1745 goto out; 1746 } 1747 1748 osd_req_op_extent_osd_data_pages(req, 1, &page, len, 0, false, false); 1749 1750 { 1751 __le64 xattr_buf = cpu_to_le64(inline_version); 1752 err = osd_req_op_xattr_init(req, 0, CEPH_OSD_OP_CMPXATTR, 1753 "inline_version", &xattr_buf, 1754 sizeof(xattr_buf), 1755 CEPH_OSD_CMPXATTR_OP_GT, 1756 CEPH_OSD_CMPXATTR_MODE_U64); 1757 if (err) 1758 goto out_put; 1759 } 1760 1761 { 1762 char xattr_buf[32]; 1763 int xattr_len = snprintf(xattr_buf, sizeof(xattr_buf), 1764 "%llu", inline_version); 1765 err = osd_req_op_xattr_init(req, 2, CEPH_OSD_OP_SETXATTR, 1766 "inline_version", 1767 xattr_buf, xattr_len, 0, 0); 1768 if (err) 1769 goto out_put; 1770 } 1771 1772 req->r_mtime = inode->i_mtime; 1773 err = ceph_osdc_start_request(&fsc->client->osdc, req, false); 1774 if (!err) 1775 err = ceph_osdc_wait_request(&fsc->client->osdc, req); 1776 out_put: 1777 ceph_osdc_put_request(req); 1778 if (err == -ECANCELED) 1779 err = 0; 1780 out: 1781 if (page && page != locked_page) { 1782 if (from_pagecache) { 1783 unlock_page(page); 1784 put_page(page); 1785 } else 1786 __free_pages(page, 0); 1787 } 1788 1789 dout("uninline_data %p %llx.%llx inline_version %llu = %d\n", 1790 inode, ceph_vinop(inode), inline_version, err); 1791 return err; 1792 } 1793 1794 static const struct vm_operations_struct ceph_vmops = { 1795 .fault = ceph_filemap_fault, 1796 .page_mkwrite = ceph_page_mkwrite, 1797 }; 1798 1799 int ceph_mmap(struct file *file, struct vm_area_struct *vma) 1800 { 1801 struct address_space *mapping = file->f_mapping; 1802 1803 if (!mapping->a_ops->readpage) 1804 return -ENOEXEC; 1805 file_accessed(file); 1806 vma->vm_ops = &ceph_vmops; 1807 return 0; 1808 } 1809 1810 enum { 1811 POOL_READ = 1, 1812 POOL_WRITE = 2, 1813 }; 1814 1815 static int __ceph_pool_perm_get(struct ceph_inode_info *ci, 1816 s64 pool, struct ceph_string *pool_ns) 1817 { 1818 struct ceph_fs_client *fsc = ceph_inode_to_client(&ci->vfs_inode); 1819 struct ceph_mds_client *mdsc = fsc->mdsc; 1820 struct ceph_osd_request *rd_req = NULL, *wr_req = NULL; 1821 struct rb_node **p, *parent; 1822 struct ceph_pool_perm *perm; 1823 struct page **pages; 1824 size_t pool_ns_len; 1825 int err = 0, err2 = 0, have = 0; 1826 1827 down_read(&mdsc->pool_perm_rwsem); 1828 p = &mdsc->pool_perm_tree.rb_node; 1829 while (*p) { 1830 perm = rb_entry(*p, struct ceph_pool_perm, node); 1831 if (pool < perm->pool) 1832 p = &(*p)->rb_left; 1833 else if (pool > perm->pool) 1834 p = &(*p)->rb_right; 1835 else { 1836 int ret = ceph_compare_string(pool_ns, 1837 perm->pool_ns, 1838 perm->pool_ns_len); 1839 if (ret < 0) 1840 p = &(*p)->rb_left; 1841 else if (ret > 0) 1842 p = &(*p)->rb_right; 1843 else { 1844 have = perm->perm; 1845 break; 1846 } 1847 } 1848 } 1849 up_read(&mdsc->pool_perm_rwsem); 1850 if (*p) 1851 goto out; 1852 1853 if (pool_ns) 1854 dout("__ceph_pool_perm_get pool %lld ns %.*s no perm cached\n", 1855 pool, (int)pool_ns->len, pool_ns->str); 1856 else 1857 dout("__ceph_pool_perm_get pool %lld no perm cached\n", pool); 1858 1859 down_write(&mdsc->pool_perm_rwsem); 1860 p = &mdsc->pool_perm_tree.rb_node; 1861 parent = NULL; 1862 while (*p) { 1863 parent = *p; 1864 perm = rb_entry(parent, struct ceph_pool_perm, node); 1865 if (pool < perm->pool) 1866 p = &(*p)->rb_left; 1867 else if (pool > perm->pool) 1868 p = &(*p)->rb_right; 1869 else { 1870 int ret = ceph_compare_string(pool_ns, 1871 perm->pool_ns, 1872 perm->pool_ns_len); 1873 if (ret < 0) 1874 p = &(*p)->rb_left; 1875 else if (ret > 0) 1876 p = &(*p)->rb_right; 1877 else { 1878 have = perm->perm; 1879 break; 1880 } 1881 } 1882 } 1883 if (*p) { 1884 up_write(&mdsc->pool_perm_rwsem); 1885 goto out; 1886 } 1887 1888 rd_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL, 1889 1, false, GFP_NOFS); 1890 if (!rd_req) { 1891 err = -ENOMEM; 1892 goto out_unlock; 1893 } 1894 1895 rd_req->r_flags = CEPH_OSD_FLAG_READ; 1896 osd_req_op_init(rd_req, 0, CEPH_OSD_OP_STAT, 0); 1897 rd_req->r_base_oloc.pool = pool; 1898 if (pool_ns) 1899 rd_req->r_base_oloc.pool_ns = ceph_get_string(pool_ns); 1900 ceph_oid_printf(&rd_req->r_base_oid, "%llx.00000000", ci->i_vino.ino); 1901 1902 err = ceph_osdc_alloc_messages(rd_req, GFP_NOFS); 1903 if (err) 1904 goto out_unlock; 1905 1906 wr_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL, 1907 1, false, GFP_NOFS); 1908 if (!wr_req) { 1909 err = -ENOMEM; 1910 goto out_unlock; 1911 } 1912 1913 wr_req->r_flags = CEPH_OSD_FLAG_WRITE; 1914 osd_req_op_init(wr_req, 0, CEPH_OSD_OP_CREATE, CEPH_OSD_OP_FLAG_EXCL); 1915 ceph_oloc_copy(&wr_req->r_base_oloc, &rd_req->r_base_oloc); 1916 ceph_oid_copy(&wr_req->r_base_oid, &rd_req->r_base_oid); 1917 1918 err = ceph_osdc_alloc_messages(wr_req, GFP_NOFS); 1919 if (err) 1920 goto out_unlock; 1921 1922 /* one page should be large enough for STAT data */ 1923 pages = ceph_alloc_page_vector(1, GFP_KERNEL); 1924 if (IS_ERR(pages)) { 1925 err = PTR_ERR(pages); 1926 goto out_unlock; 1927 } 1928 1929 osd_req_op_raw_data_in_pages(rd_req, 0, pages, PAGE_SIZE, 1930 0, false, true); 1931 err = ceph_osdc_start_request(&fsc->client->osdc, rd_req, false); 1932 1933 wr_req->r_mtime = ci->vfs_inode.i_mtime; 1934 wr_req->r_abort_on_full = true; 1935 err2 = ceph_osdc_start_request(&fsc->client->osdc, wr_req, false); 1936 1937 if (!err) 1938 err = ceph_osdc_wait_request(&fsc->client->osdc, rd_req); 1939 if (!err2) 1940 err2 = ceph_osdc_wait_request(&fsc->client->osdc, wr_req); 1941 1942 if (err >= 0 || err == -ENOENT) 1943 have |= POOL_READ; 1944 else if (err != -EPERM) 1945 goto out_unlock; 1946 1947 if (err2 == 0 || err2 == -EEXIST) 1948 have |= POOL_WRITE; 1949 else if (err2 != -EPERM) { 1950 err = err2; 1951 goto out_unlock; 1952 } 1953 1954 pool_ns_len = pool_ns ? pool_ns->len : 0; 1955 perm = kmalloc(sizeof(*perm) + pool_ns_len + 1, GFP_NOFS); 1956 if (!perm) { 1957 err = -ENOMEM; 1958 goto out_unlock; 1959 } 1960 1961 perm->pool = pool; 1962 perm->perm = have; 1963 perm->pool_ns_len = pool_ns_len; 1964 if (pool_ns_len > 0) 1965 memcpy(perm->pool_ns, pool_ns->str, pool_ns_len); 1966 perm->pool_ns[pool_ns_len] = 0; 1967 1968 rb_link_node(&perm->node, parent, p); 1969 rb_insert_color(&perm->node, &mdsc->pool_perm_tree); 1970 err = 0; 1971 out_unlock: 1972 up_write(&mdsc->pool_perm_rwsem); 1973 1974 ceph_osdc_put_request(rd_req); 1975 ceph_osdc_put_request(wr_req); 1976 out: 1977 if (!err) 1978 err = have; 1979 if (pool_ns) 1980 dout("__ceph_pool_perm_get pool %lld ns %.*s result = %d\n", 1981 pool, (int)pool_ns->len, pool_ns->str, err); 1982 else 1983 dout("__ceph_pool_perm_get pool %lld result = %d\n", pool, err); 1984 return err; 1985 } 1986 1987 int ceph_pool_perm_check(struct ceph_inode_info *ci, int need) 1988 { 1989 s64 pool; 1990 struct ceph_string *pool_ns; 1991 int ret, flags; 1992 1993 if (ci->i_vino.snap != CEPH_NOSNAP) { 1994 /* 1995 * Pool permission check needs to write to the first object. 1996 * But for snapshot, head of the first object may have alread 1997 * been deleted. Skip check to avoid creating orphan object. 1998 */ 1999 return 0; 2000 } 2001 2002 if (ceph_test_mount_opt(ceph_inode_to_client(&ci->vfs_inode), 2003 NOPOOLPERM)) 2004 return 0; 2005 2006 spin_lock(&ci->i_ceph_lock); 2007 flags = ci->i_ceph_flags; 2008 pool = ci->i_layout.pool_id; 2009 spin_unlock(&ci->i_ceph_lock); 2010 check: 2011 if (flags & CEPH_I_POOL_PERM) { 2012 if ((need & CEPH_CAP_FILE_RD) && !(flags & CEPH_I_POOL_RD)) { 2013 dout("ceph_pool_perm_check pool %lld no read perm\n", 2014 pool); 2015 return -EPERM; 2016 } 2017 if ((need & CEPH_CAP_FILE_WR) && !(flags & CEPH_I_POOL_WR)) { 2018 dout("ceph_pool_perm_check pool %lld no write perm\n", 2019 pool); 2020 return -EPERM; 2021 } 2022 return 0; 2023 } 2024 2025 pool_ns = ceph_try_get_string(ci->i_layout.pool_ns); 2026 ret = __ceph_pool_perm_get(ci, pool, pool_ns); 2027 ceph_put_string(pool_ns); 2028 if (ret < 0) 2029 return ret; 2030 2031 flags = CEPH_I_POOL_PERM; 2032 if (ret & POOL_READ) 2033 flags |= CEPH_I_POOL_RD; 2034 if (ret & POOL_WRITE) 2035 flags |= CEPH_I_POOL_WR; 2036 2037 spin_lock(&ci->i_ceph_lock); 2038 if (pool == ci->i_layout.pool_id && 2039 pool_ns == rcu_dereference_raw(ci->i_layout.pool_ns)) { 2040 ci->i_ceph_flags |= flags; 2041 } else { 2042 pool = ci->i_layout.pool_id; 2043 flags = ci->i_ceph_flags; 2044 } 2045 spin_unlock(&ci->i_ceph_lock); 2046 goto check; 2047 } 2048 2049 void ceph_pool_perm_destroy(struct ceph_mds_client *mdsc) 2050 { 2051 struct ceph_pool_perm *perm; 2052 struct rb_node *n; 2053 2054 while (!RB_EMPTY_ROOT(&mdsc->pool_perm_tree)) { 2055 n = rb_first(&mdsc->pool_perm_tree); 2056 perm = rb_entry(n, struct ceph_pool_perm, node); 2057 rb_erase(n, &mdsc->pool_perm_tree); 2058 kfree(perm); 2059 } 2060 } 2061