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