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 #include <linux/ceph/striper.h> 19 20 /* 21 * Ceph address space ops. 22 * 23 * There are a few funny things going on here. 24 * 25 * The page->private field is used to reference a struct 26 * ceph_snap_context for _every_ dirty page. This indicates which 27 * snapshot the page was logically dirtied in, and thus which snap 28 * context needs to be associated with the osd write during writeback. 29 * 30 * Similarly, struct ceph_inode_info maintains a set of counters to 31 * count dirty pages on the inode. In the absence of snapshots, 32 * i_wrbuffer_ref == i_wrbuffer_ref_head == the dirty page count. 33 * 34 * When a snapshot is taken (that is, when the client receives 35 * notification that a snapshot was taken), each inode with caps and 36 * with dirty pages (dirty pages implies there is a cap) gets a new 37 * ceph_cap_snap in the i_cap_snaps list (which is sorted in ascending 38 * order, new snaps go to the tail). The i_wrbuffer_ref_head count is 39 * moved to capsnap->dirty. (Unless a sync write is currently in 40 * progress. In that case, the capsnap is said to be "pending", new 41 * writes cannot start, and the capsnap isn't "finalized" until the 42 * write completes (or fails) and a final size/mtime for the inode for 43 * that snap can be settled upon.) i_wrbuffer_ref_head is reset to 0. 44 * 45 * On writeback, we must submit writes to the osd IN SNAP ORDER. So, 46 * we look for the first capsnap in i_cap_snaps and write out pages in 47 * that snap context _only_. Then we move on to the next capsnap, 48 * eventually reaching the "live" or "head" context (i.e., pages that 49 * are not yet snapped) and are writing the most recently dirtied 50 * pages. 51 * 52 * Invalidate and so forth must take care to ensure the dirty page 53 * accounting is preserved. 54 */ 55 56 #define CONGESTION_ON_THRESH(congestion_kb) (congestion_kb >> (PAGE_SHIFT-10)) 57 #define CONGESTION_OFF_THRESH(congestion_kb) \ 58 (CONGESTION_ON_THRESH(congestion_kb) - \ 59 (CONGESTION_ON_THRESH(congestion_kb) >> 2)) 60 61 static inline struct ceph_snap_context *page_snap_context(struct page *page) 62 { 63 if (PagePrivate(page)) 64 return (void *)page->private; 65 return NULL; 66 } 67 68 /* 69 * Dirty a page. Optimistically adjust accounting, on the assumption 70 * that we won't race with invalidate. If we do, readjust. 71 */ 72 static int ceph_set_page_dirty(struct page *page) 73 { 74 struct address_space *mapping = page->mapping; 75 struct inode *inode; 76 struct ceph_inode_info *ci; 77 struct ceph_snap_context *snapc; 78 int ret; 79 80 if (unlikely(!mapping)) 81 return !TestSetPageDirty(page); 82 83 if (PageDirty(page)) { 84 dout("%p set_page_dirty %p idx %lu -- already dirty\n", 85 mapping->host, page, page->index); 86 BUG_ON(!PagePrivate(page)); 87 return 0; 88 } 89 90 inode = mapping->host; 91 ci = ceph_inode(inode); 92 93 /* dirty the head */ 94 spin_lock(&ci->i_ceph_lock); 95 BUG_ON(ci->i_wr_ref == 0); // caller should hold Fw reference 96 if (__ceph_have_pending_cap_snap(ci)) { 97 struct ceph_cap_snap *capsnap = 98 list_last_entry(&ci->i_cap_snaps, 99 struct ceph_cap_snap, 100 ci_item); 101 snapc = ceph_get_snap_context(capsnap->context); 102 capsnap->dirty_pages++; 103 } else { 104 BUG_ON(!ci->i_head_snapc); 105 snapc = ceph_get_snap_context(ci->i_head_snapc); 106 ++ci->i_wrbuffer_ref_head; 107 } 108 if (ci->i_wrbuffer_ref == 0) 109 ihold(inode); 110 ++ci->i_wrbuffer_ref; 111 dout("%p set_page_dirty %p idx %lu head %d/%d -> %d/%d " 112 "snapc %p seq %lld (%d snaps)\n", 113 mapping->host, page, page->index, 114 ci->i_wrbuffer_ref-1, ci->i_wrbuffer_ref_head-1, 115 ci->i_wrbuffer_ref, ci->i_wrbuffer_ref_head, 116 snapc, snapc->seq, snapc->num_snaps); 117 spin_unlock(&ci->i_ceph_lock); 118 119 /* 120 * Reference snap context in page->private. Also set 121 * PagePrivate so that we get invalidatepage callback. 122 */ 123 BUG_ON(PagePrivate(page)); 124 page->private = (unsigned long)snapc; 125 SetPagePrivate(page); 126 127 ret = __set_page_dirty_nobuffers(page); 128 WARN_ON(!PageLocked(page)); 129 WARN_ON(!page->mapping); 130 131 return ret; 132 } 133 134 /* 135 * If we are truncating the full page (i.e. offset == 0), adjust the 136 * dirty page counters appropriately. Only called if there is private 137 * data on the page. 138 */ 139 static void ceph_invalidatepage(struct page *page, unsigned int offset, 140 unsigned int length) 141 { 142 struct inode *inode; 143 struct ceph_inode_info *ci; 144 struct ceph_snap_context *snapc = page_snap_context(page); 145 146 inode = page->mapping->host; 147 ci = ceph_inode(inode); 148 149 if (offset != 0 || length != PAGE_SIZE) { 150 dout("%p invalidatepage %p idx %lu partial dirty page %u~%u\n", 151 inode, page, page->index, offset, length); 152 return; 153 } 154 155 ceph_invalidate_fscache_page(inode, page); 156 157 WARN_ON(!PageLocked(page)); 158 if (!PagePrivate(page)) 159 return; 160 161 ClearPageChecked(page); 162 163 dout("%p invalidatepage %p idx %lu full dirty page\n", 164 inode, page, page->index); 165 166 ceph_put_wrbuffer_cap_refs(ci, 1, snapc); 167 ceph_put_snap_context(snapc); 168 page->private = 0; 169 ClearPagePrivate(page); 170 } 171 172 static int ceph_releasepage(struct page *page, gfp_t g) 173 { 174 dout("%p releasepage %p idx %lu (%sdirty)\n", page->mapping->host, 175 page, page->index, PageDirty(page) ? "" : "not "); 176 177 /* Can we release the page from the cache? */ 178 if (!ceph_release_fscache_page(page, g)) 179 return 0; 180 181 return !PagePrivate(page); 182 } 183 184 /* 185 * read a single page, without unlocking it. 186 */ 187 static int ceph_do_readpage(struct file *filp, struct page *page) 188 { 189 struct inode *inode = file_inode(filp); 190 struct ceph_inode_info *ci = ceph_inode(inode); 191 struct ceph_osd_client *osdc = 192 &ceph_inode_to_client(inode)->client->osdc; 193 int err = 0; 194 u64 off = page_offset(page); 195 u64 len = PAGE_SIZE; 196 197 if (off >= i_size_read(inode)) { 198 zero_user_segment(page, 0, PAGE_SIZE); 199 SetPageUptodate(page); 200 return 0; 201 } 202 203 if (ci->i_inline_version != CEPH_INLINE_NONE) { 204 /* 205 * Uptodate inline data should have been added 206 * into page cache while getting Fcr caps. 207 */ 208 if (off == 0) 209 return -EINVAL; 210 zero_user_segment(page, 0, PAGE_SIZE); 211 SetPageUptodate(page); 212 return 0; 213 } 214 215 err = ceph_readpage_from_fscache(inode, page); 216 if (err == 0) 217 return -EINPROGRESS; 218 219 dout("readpage inode %p file %p page %p index %lu\n", 220 inode, filp, page, page->index); 221 err = ceph_osdc_readpages(osdc, ceph_vino(inode), &ci->i_layout, 222 off, &len, 223 ci->i_truncate_seq, ci->i_truncate_size, 224 &page, 1, 0); 225 if (err == -ENOENT) 226 err = 0; 227 if (err < 0) { 228 SetPageError(page); 229 ceph_fscache_readpage_cancel(inode, page); 230 goto out; 231 } 232 if (err < PAGE_SIZE) 233 /* zero fill remainder of page */ 234 zero_user_segment(page, err, PAGE_SIZE); 235 else 236 flush_dcache_page(page); 237 238 SetPageUptodate(page); 239 ceph_readpage_to_fscache(inode, page); 240 241 out: 242 return err < 0 ? err : 0; 243 } 244 245 static int ceph_readpage(struct file *filp, struct page *page) 246 { 247 int r = ceph_do_readpage(filp, page); 248 if (r != -EINPROGRESS) 249 unlock_page(page); 250 else 251 r = 0; 252 return r; 253 } 254 255 /* 256 * Finish an async read(ahead) op. 257 */ 258 static void finish_read(struct ceph_osd_request *req) 259 { 260 struct inode *inode = req->r_inode; 261 struct ceph_osd_data *osd_data; 262 int rc = req->r_result <= 0 ? req->r_result : 0; 263 int bytes = req->r_result >= 0 ? req->r_result : 0; 264 int num_pages; 265 int i; 266 267 dout("finish_read %p req %p rc %d bytes %d\n", inode, req, rc, bytes); 268 269 /* unlock all pages, zeroing any data we didn't read */ 270 osd_data = osd_req_op_extent_osd_data(req, 0); 271 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES); 272 num_pages = calc_pages_for((u64)osd_data->alignment, 273 (u64)osd_data->length); 274 for (i = 0; i < num_pages; i++) { 275 struct page *page = osd_data->pages[i]; 276 277 if (rc < 0 && rc != -ENOENT) { 278 ceph_fscache_readpage_cancel(inode, page); 279 goto unlock; 280 } 281 if (bytes < (int)PAGE_SIZE) { 282 /* zero (remainder of) page */ 283 int s = bytes < 0 ? 0 : bytes; 284 zero_user_segment(page, s, PAGE_SIZE); 285 } 286 dout("finish_read %p uptodate %p idx %lu\n", inode, page, 287 page->index); 288 flush_dcache_page(page); 289 SetPageUptodate(page); 290 ceph_readpage_to_fscache(inode, page); 291 unlock: 292 unlock_page(page); 293 put_page(page); 294 bytes -= PAGE_SIZE; 295 } 296 kfree(osd_data->pages); 297 } 298 299 /* 300 * start an async read(ahead) operation. return nr_pages we submitted 301 * a read for on success, or negative error code. 302 */ 303 static int start_read(struct inode *inode, struct ceph_rw_context *rw_ctx, 304 struct list_head *page_list, int max) 305 { 306 struct ceph_osd_client *osdc = 307 &ceph_inode_to_client(inode)->client->osdc; 308 struct ceph_inode_info *ci = ceph_inode(inode); 309 struct page *page = lru_to_page(page_list); 310 struct ceph_vino vino; 311 struct ceph_osd_request *req; 312 u64 off; 313 u64 len; 314 int i; 315 struct page **pages; 316 pgoff_t next_index; 317 int nr_pages = 0; 318 int got = 0; 319 int ret = 0; 320 321 if (!rw_ctx) { 322 /* caller of readpages does not hold buffer and read caps 323 * (fadvise, madvise and readahead cases) */ 324 int want = CEPH_CAP_FILE_CACHE; 325 ret = ceph_try_get_caps(ci, CEPH_CAP_FILE_RD, want, true, &got); 326 if (ret < 0) { 327 dout("start_read %p, error getting cap\n", inode); 328 } else if (!(got & want)) { 329 dout("start_read %p, no cache cap\n", inode); 330 ret = 0; 331 } 332 if (ret <= 0) { 333 if (got) 334 ceph_put_cap_refs(ci, got); 335 while (!list_empty(page_list)) { 336 page = lru_to_page(page_list); 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_array(nr_pages, sizeof(*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 *fi = 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(fi); 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 int err, len = PAGE_SIZE; 582 struct ceph_writeback_ctl ceph_wbc; 583 584 dout("writepage %p idx %lu\n", page, page->index); 585 586 inode = page->mapping->host; 587 ci = ceph_inode(inode); 588 fsc = ceph_inode_to_client(inode); 589 590 /* verify this is a writeable snap context */ 591 snapc = page_snap_context(page); 592 if (!snapc) { 593 dout("writepage %p page %p not dirty?\n", inode, page); 594 return 0; 595 } 596 oldest = get_oldest_context(inode, &ceph_wbc, snapc); 597 if (snapc->seq > oldest->seq) { 598 dout("writepage %p page %p snapc %p not writeable - noop\n", 599 inode, page, snapc); 600 /* we should only noop if called by kswapd */ 601 WARN_ON(!(current->flags & PF_MEMALLOC)); 602 ceph_put_snap_context(oldest); 603 redirty_page_for_writepage(wbc, page); 604 return 0; 605 } 606 ceph_put_snap_context(oldest); 607 608 /* is this a partial page at end of file? */ 609 if (page_off >= ceph_wbc.i_size) { 610 dout("%p page eof %llu\n", page, ceph_wbc.i_size); 611 page->mapping->a_ops->invalidatepage(page, 0, PAGE_SIZE); 612 return 0; 613 } 614 615 if (ceph_wbc.i_size < page_off + len) 616 len = ceph_wbc.i_size - page_off; 617 618 dout("writepage %p page %p index %lu on %llu~%u snapc %p seq %lld\n", 619 inode, page, page->index, page_off, len, snapc, snapc->seq); 620 621 if (atomic_long_inc_return(&fsc->writeback_count) > 622 CONGESTION_ON_THRESH(fsc->mount_options->congestion_kb)) 623 set_bdi_congested(inode_to_bdi(inode), BLK_RW_ASYNC); 624 625 set_page_writeback(page); 626 err = ceph_osdc_writepages(&fsc->client->osdc, ceph_vino(inode), 627 &ci->i_layout, snapc, page_off, len, 628 ceph_wbc.truncate_seq, 629 ceph_wbc.truncate_size, 630 &inode->i_mtime, &page, 1); 631 if (err < 0) { 632 struct writeback_control tmp_wbc; 633 if (!wbc) 634 wbc = &tmp_wbc; 635 if (err == -ERESTARTSYS) { 636 /* killed by SIGKILL */ 637 dout("writepage interrupted page %p\n", page); 638 redirty_page_for_writepage(wbc, page); 639 end_page_writeback(page); 640 return err; 641 } 642 dout("writepage setting page/mapping error %d %p\n", 643 err, page); 644 SetPageError(page); 645 mapping_set_error(&inode->i_data, err); 646 wbc->pages_skipped++; 647 } else { 648 dout("writepage cleaned page %p\n", page); 649 err = 0; /* vfs expects us to return 0 */ 650 } 651 page->private = 0; 652 ClearPagePrivate(page); 653 end_page_writeback(page); 654 ceph_put_wrbuffer_cap_refs(ci, 1, snapc); 655 ceph_put_snap_context(snapc); /* page's reference */ 656 657 if (atomic_long_dec_return(&fsc->writeback_count) < 658 CONGESTION_OFF_THRESH(fsc->mount_options->congestion_kb)) 659 clear_bdi_congested(inode_to_bdi(inode), BLK_RW_ASYNC); 660 661 return err; 662 } 663 664 static int ceph_writepage(struct page *page, struct writeback_control *wbc) 665 { 666 int err; 667 struct inode *inode = page->mapping->host; 668 BUG_ON(!inode); 669 ihold(inode); 670 err = writepage_nounlock(page, wbc); 671 if (err == -ERESTARTSYS) { 672 /* direct memory reclaimer was killed by SIGKILL. return 0 673 * to prevent caller from setting mapping/page error */ 674 err = 0; 675 } 676 unlock_page(page); 677 iput(inode); 678 return err; 679 } 680 681 /* 682 * lame release_pages helper. release_pages() isn't exported to 683 * modules. 684 */ 685 static void ceph_release_pages(struct page **pages, int num) 686 { 687 struct pagevec pvec; 688 int i; 689 690 pagevec_init(&pvec); 691 for (i = 0; i < num; i++) { 692 if (pagevec_add(&pvec, pages[i]) == 0) 693 pagevec_release(&pvec); 694 } 695 pagevec_release(&pvec); 696 } 697 698 /* 699 * async writeback completion handler. 700 * 701 * If we get an error, set the mapping error bit, but not the individual 702 * page error bits. 703 */ 704 static void writepages_finish(struct ceph_osd_request *req) 705 { 706 struct inode *inode = req->r_inode; 707 struct ceph_inode_info *ci = ceph_inode(inode); 708 struct ceph_osd_data *osd_data; 709 struct page *page; 710 int num_pages, total_pages = 0; 711 int i, j; 712 int rc = req->r_result; 713 struct ceph_snap_context *snapc = req->r_snapc; 714 struct address_space *mapping = inode->i_mapping; 715 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 716 bool remove_page; 717 718 dout("writepages_finish %p rc %d\n", inode, rc); 719 if (rc < 0) { 720 mapping_set_error(mapping, rc); 721 ceph_set_error_write(ci); 722 } else { 723 ceph_clear_error_write(ci); 724 } 725 726 /* 727 * We lost the cache cap, need to truncate the page before 728 * it is unlocked, otherwise we'd truncate it later in the 729 * page truncation thread, possibly losing some data that 730 * raced its way in 731 */ 732 remove_page = !(ceph_caps_issued(ci) & 733 (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)); 734 735 /* clean all pages */ 736 for (i = 0; i < req->r_num_ops; i++) { 737 if (req->r_ops[i].op != CEPH_OSD_OP_WRITE) 738 break; 739 740 osd_data = osd_req_op_extent_osd_data(req, i); 741 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES); 742 num_pages = calc_pages_for((u64)osd_data->alignment, 743 (u64)osd_data->length); 744 total_pages += num_pages; 745 for (j = 0; j < num_pages; j++) { 746 page = osd_data->pages[j]; 747 BUG_ON(!page); 748 WARN_ON(!PageUptodate(page)); 749 750 if (atomic_long_dec_return(&fsc->writeback_count) < 751 CONGESTION_OFF_THRESH( 752 fsc->mount_options->congestion_kb)) 753 clear_bdi_congested(inode_to_bdi(inode), 754 BLK_RW_ASYNC); 755 756 ceph_put_snap_context(page_snap_context(page)); 757 page->private = 0; 758 ClearPagePrivate(page); 759 dout("unlocking %p\n", page); 760 end_page_writeback(page); 761 762 if (remove_page) 763 generic_error_remove_page(inode->i_mapping, 764 page); 765 766 unlock_page(page); 767 } 768 dout("writepages_finish %p wrote %llu bytes cleaned %d pages\n", 769 inode, osd_data->length, rc >= 0 ? num_pages : 0); 770 771 ceph_release_pages(osd_data->pages, num_pages); 772 } 773 774 ceph_put_wrbuffer_cap_refs(ci, total_pages, snapc); 775 776 osd_data = osd_req_op_extent_osd_data(req, 0); 777 if (osd_data->pages_from_pool) 778 mempool_free(osd_data->pages, 779 ceph_sb_to_client(inode->i_sb)->wb_pagevec_pool); 780 else 781 kfree(osd_data->pages); 782 ceph_osdc_put_request(req); 783 } 784 785 /* 786 * initiate async writeback 787 */ 788 static int ceph_writepages_start(struct address_space *mapping, 789 struct writeback_control *wbc) 790 { 791 struct inode *inode = mapping->host; 792 struct ceph_inode_info *ci = ceph_inode(inode); 793 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 794 struct ceph_vino vino = ceph_vino(inode); 795 pgoff_t index, start_index, end = -1; 796 struct ceph_snap_context *snapc = NULL, *last_snapc = NULL, *pgsnapc; 797 struct pagevec pvec; 798 int rc = 0; 799 unsigned int wsize = i_blocksize(inode); 800 struct ceph_osd_request *req = NULL; 801 struct ceph_writeback_ctl ceph_wbc; 802 bool should_loop, range_whole = false; 803 bool done = false; 804 805 dout("writepages_start %p (mode=%s)\n", inode, 806 wbc->sync_mode == WB_SYNC_NONE ? "NONE" : 807 (wbc->sync_mode == WB_SYNC_ALL ? "ALL" : "HOLD")); 808 809 if (READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) { 810 if (ci->i_wrbuffer_ref > 0) { 811 pr_warn_ratelimited( 812 "writepage_start %p %lld forced umount\n", 813 inode, ceph_ino(inode)); 814 } 815 mapping_set_error(mapping, -EIO); 816 return -EIO; /* we're in a forced umount, don't write! */ 817 } 818 if (fsc->mount_options->wsize < wsize) 819 wsize = fsc->mount_options->wsize; 820 821 pagevec_init(&pvec); 822 823 start_index = wbc->range_cyclic ? mapping->writeback_index : 0; 824 index = start_index; 825 826 retry: 827 /* find oldest snap context with dirty data */ 828 snapc = get_oldest_context(inode, &ceph_wbc, NULL); 829 if (!snapc) { 830 /* hmm, why does writepages get called when there 831 is no dirty data? */ 832 dout(" no snap context with dirty data?\n"); 833 goto out; 834 } 835 dout(" oldest snapc is %p seq %lld (%d snaps)\n", 836 snapc, snapc->seq, snapc->num_snaps); 837 838 should_loop = false; 839 if (ceph_wbc.head_snapc && snapc != last_snapc) { 840 /* where to start/end? */ 841 if (wbc->range_cyclic) { 842 index = start_index; 843 end = -1; 844 if (index > 0) 845 should_loop = true; 846 dout(" cyclic, start at %lu\n", index); 847 } else { 848 index = wbc->range_start >> PAGE_SHIFT; 849 end = wbc->range_end >> PAGE_SHIFT; 850 if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) 851 range_whole = true; 852 dout(" not cyclic, %lu to %lu\n", index, end); 853 } 854 } else if (!ceph_wbc.head_snapc) { 855 /* Do not respect wbc->range_{start,end}. Dirty pages 856 * in that range can be associated with newer snapc. 857 * They are not writeable until we write all dirty pages 858 * associated with 'snapc' get written */ 859 if (index > 0) 860 should_loop = true; 861 dout(" non-head snapc, range whole\n"); 862 } 863 864 ceph_put_snap_context(last_snapc); 865 last_snapc = snapc; 866 867 while (!done && index <= end) { 868 int num_ops = 0, op_idx; 869 unsigned i, pvec_pages, max_pages, locked_pages = 0; 870 struct page **pages = NULL, **data_pages; 871 mempool_t *pool = NULL; /* Becomes non-null if mempool used */ 872 struct page *page; 873 pgoff_t strip_unit_end = 0; 874 u64 offset = 0, len = 0; 875 876 max_pages = wsize >> PAGE_SHIFT; 877 878 get_more_pages: 879 pvec_pages = pagevec_lookup_range_nr_tag(&pvec, mapping, &index, 880 end, PAGECACHE_TAG_DIRTY, 881 max_pages - locked_pages); 882 dout("pagevec_lookup_range_tag got %d\n", pvec_pages); 883 if (!pvec_pages && !locked_pages) 884 break; 885 for (i = 0; i < pvec_pages && locked_pages < max_pages; i++) { 886 page = pvec.pages[i]; 887 dout("? %p idx %lu\n", page, page->index); 888 if (locked_pages == 0) 889 lock_page(page); /* first page */ 890 else if (!trylock_page(page)) 891 break; 892 893 /* only dirty pages, or our accounting breaks */ 894 if (unlikely(!PageDirty(page)) || 895 unlikely(page->mapping != mapping)) { 896 dout("!dirty or !mapping %p\n", page); 897 unlock_page(page); 898 continue; 899 } 900 /* only if matching snap context */ 901 pgsnapc = page_snap_context(page); 902 if (pgsnapc != snapc) { 903 dout("page snapc %p %lld != oldest %p %lld\n", 904 pgsnapc, pgsnapc->seq, snapc, snapc->seq); 905 if (!should_loop && 906 !ceph_wbc.head_snapc && 907 wbc->sync_mode != WB_SYNC_NONE) 908 should_loop = true; 909 unlock_page(page); 910 continue; 911 } 912 if (page_offset(page) >= ceph_wbc.i_size) { 913 dout("%p page eof %llu\n", 914 page, ceph_wbc.i_size); 915 if (ceph_wbc.size_stable || 916 page_offset(page) >= i_size_read(inode)) 917 mapping->a_ops->invalidatepage(page, 918 0, PAGE_SIZE); 919 unlock_page(page); 920 continue; 921 } 922 if (strip_unit_end && (page->index > strip_unit_end)) { 923 dout("end of strip unit %p\n", page); 924 unlock_page(page); 925 break; 926 } 927 if (PageWriteback(page)) { 928 if (wbc->sync_mode == WB_SYNC_NONE) { 929 dout("%p under writeback\n", page); 930 unlock_page(page); 931 continue; 932 } 933 dout("waiting on writeback %p\n", page); 934 wait_on_page_writeback(page); 935 } 936 937 if (!clear_page_dirty_for_io(page)) { 938 dout("%p !clear_page_dirty_for_io\n", page); 939 unlock_page(page); 940 continue; 941 } 942 943 /* 944 * We have something to write. If this is 945 * the first locked page this time through, 946 * calculate max possinle write size and 947 * allocate a page array 948 */ 949 if (locked_pages == 0) { 950 u64 objnum; 951 u64 objoff; 952 u32 xlen; 953 954 /* prepare async write request */ 955 offset = (u64)page_offset(page); 956 ceph_calc_file_object_mapping(&ci->i_layout, 957 offset, wsize, 958 &objnum, &objoff, 959 &xlen); 960 len = xlen; 961 962 num_ops = 1; 963 strip_unit_end = page->index + 964 ((len - 1) >> PAGE_SHIFT); 965 966 BUG_ON(pages); 967 max_pages = calc_pages_for(0, (u64)len); 968 pages = kmalloc_array(max_pages, 969 sizeof(*pages), 970 GFP_NOFS); 971 if (!pages) { 972 pool = fsc->wb_pagevec_pool; 973 pages = mempool_alloc(pool, GFP_NOFS); 974 BUG_ON(!pages); 975 } 976 977 len = 0; 978 } else if (page->index != 979 (offset + len) >> PAGE_SHIFT) { 980 if (num_ops >= (pool ? CEPH_OSD_SLAB_OPS : 981 CEPH_OSD_MAX_OPS)) { 982 redirty_page_for_writepage(wbc, page); 983 unlock_page(page); 984 break; 985 } 986 987 num_ops++; 988 offset = (u64)page_offset(page); 989 len = 0; 990 } 991 992 /* note position of first page in pvec */ 993 dout("%p will write page %p idx %lu\n", 994 inode, page, page->index); 995 996 if (atomic_long_inc_return(&fsc->writeback_count) > 997 CONGESTION_ON_THRESH( 998 fsc->mount_options->congestion_kb)) { 999 set_bdi_congested(inode_to_bdi(inode), 1000 BLK_RW_ASYNC); 1001 } 1002 1003 1004 pages[locked_pages++] = page; 1005 pvec.pages[i] = NULL; 1006 1007 len += PAGE_SIZE; 1008 } 1009 1010 /* did we get anything? */ 1011 if (!locked_pages) 1012 goto release_pvec_pages; 1013 if (i) { 1014 unsigned j, n = 0; 1015 /* shift unused page to beginning of pvec */ 1016 for (j = 0; j < pvec_pages; j++) { 1017 if (!pvec.pages[j]) 1018 continue; 1019 if (n < j) 1020 pvec.pages[n] = pvec.pages[j]; 1021 n++; 1022 } 1023 pvec.nr = n; 1024 1025 if (pvec_pages && i == pvec_pages && 1026 locked_pages < max_pages) { 1027 dout("reached end pvec, trying for more\n"); 1028 pagevec_release(&pvec); 1029 goto get_more_pages; 1030 } 1031 } 1032 1033 new_request: 1034 offset = page_offset(pages[0]); 1035 len = wsize; 1036 1037 req = ceph_osdc_new_request(&fsc->client->osdc, 1038 &ci->i_layout, vino, 1039 offset, &len, 0, num_ops, 1040 CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE, 1041 snapc, ceph_wbc.truncate_seq, 1042 ceph_wbc.truncate_size, false); 1043 if (IS_ERR(req)) { 1044 req = ceph_osdc_new_request(&fsc->client->osdc, 1045 &ci->i_layout, vino, 1046 offset, &len, 0, 1047 min(num_ops, 1048 CEPH_OSD_SLAB_OPS), 1049 CEPH_OSD_OP_WRITE, 1050 CEPH_OSD_FLAG_WRITE, 1051 snapc, ceph_wbc.truncate_seq, 1052 ceph_wbc.truncate_size, true); 1053 BUG_ON(IS_ERR(req)); 1054 } 1055 BUG_ON(len < page_offset(pages[locked_pages - 1]) + 1056 PAGE_SIZE - offset); 1057 1058 req->r_callback = writepages_finish; 1059 req->r_inode = inode; 1060 1061 /* Format the osd request message and submit the write */ 1062 len = 0; 1063 data_pages = pages; 1064 op_idx = 0; 1065 for (i = 0; i < locked_pages; i++) { 1066 u64 cur_offset = page_offset(pages[i]); 1067 if (offset + len != cur_offset) { 1068 if (op_idx + 1 == req->r_num_ops) 1069 break; 1070 osd_req_op_extent_dup_last(req, op_idx, 1071 cur_offset - offset); 1072 dout("writepages got pages at %llu~%llu\n", 1073 offset, len); 1074 osd_req_op_extent_osd_data_pages(req, op_idx, 1075 data_pages, len, 0, 1076 !!pool, false); 1077 osd_req_op_extent_update(req, op_idx, len); 1078 1079 len = 0; 1080 offset = cur_offset; 1081 data_pages = pages + i; 1082 op_idx++; 1083 } 1084 1085 set_page_writeback(pages[i]); 1086 len += PAGE_SIZE; 1087 } 1088 1089 if (ceph_wbc.size_stable) { 1090 len = min(len, ceph_wbc.i_size - offset); 1091 } else if (i == locked_pages) { 1092 /* writepages_finish() clears writeback pages 1093 * according to the data length, so make sure 1094 * data length covers all locked pages */ 1095 u64 min_len = len + 1 - PAGE_SIZE; 1096 len = get_writepages_data_length(inode, pages[i - 1], 1097 offset); 1098 len = max(len, min_len); 1099 } 1100 dout("writepages got pages at %llu~%llu\n", offset, len); 1101 1102 osd_req_op_extent_osd_data_pages(req, op_idx, data_pages, len, 1103 0, !!pool, false); 1104 osd_req_op_extent_update(req, op_idx, len); 1105 1106 BUG_ON(op_idx + 1 != req->r_num_ops); 1107 1108 pool = NULL; 1109 if (i < locked_pages) { 1110 BUG_ON(num_ops <= req->r_num_ops); 1111 num_ops -= req->r_num_ops; 1112 locked_pages -= i; 1113 1114 /* allocate new pages array for next request */ 1115 data_pages = pages; 1116 pages = kmalloc_array(locked_pages, sizeof(*pages), 1117 GFP_NOFS); 1118 if (!pages) { 1119 pool = fsc->wb_pagevec_pool; 1120 pages = mempool_alloc(pool, GFP_NOFS); 1121 BUG_ON(!pages); 1122 } 1123 memcpy(pages, data_pages + i, 1124 locked_pages * sizeof(*pages)); 1125 memset(data_pages + i, 0, 1126 locked_pages * sizeof(*pages)); 1127 } else { 1128 BUG_ON(num_ops != req->r_num_ops); 1129 index = pages[i - 1]->index + 1; 1130 /* request message now owns the pages array */ 1131 pages = NULL; 1132 } 1133 1134 req->r_mtime = inode->i_mtime; 1135 rc = ceph_osdc_start_request(&fsc->client->osdc, req, true); 1136 BUG_ON(rc); 1137 req = NULL; 1138 1139 wbc->nr_to_write -= i; 1140 if (pages) 1141 goto new_request; 1142 1143 /* 1144 * We stop writing back only if we are not doing 1145 * integrity sync. In case of integrity sync we have to 1146 * keep going until we have written all the pages 1147 * we tagged for writeback prior to entering this loop. 1148 */ 1149 if (wbc->nr_to_write <= 0 && wbc->sync_mode == WB_SYNC_NONE) 1150 done = true; 1151 1152 release_pvec_pages: 1153 dout("pagevec_release on %d pages (%p)\n", (int)pvec.nr, 1154 pvec.nr ? pvec.pages[0] : NULL); 1155 pagevec_release(&pvec); 1156 } 1157 1158 if (should_loop && !done) { 1159 /* more to do; loop back to beginning of file */ 1160 dout("writepages looping back to beginning of file\n"); 1161 end = start_index - 1; /* OK even when start_index == 0 */ 1162 1163 /* to write dirty pages associated with next snapc, 1164 * we need to wait until current writes complete */ 1165 if (wbc->sync_mode != WB_SYNC_NONE && 1166 start_index == 0 && /* all dirty pages were checked */ 1167 !ceph_wbc.head_snapc) { 1168 struct page *page; 1169 unsigned i, nr; 1170 index = 0; 1171 while ((index <= end) && 1172 (nr = pagevec_lookup_tag(&pvec, mapping, &index, 1173 PAGECACHE_TAG_WRITEBACK))) { 1174 for (i = 0; i < nr; i++) { 1175 page = pvec.pages[i]; 1176 if (page_snap_context(page) != snapc) 1177 continue; 1178 wait_on_page_writeback(page); 1179 } 1180 pagevec_release(&pvec); 1181 cond_resched(); 1182 } 1183 } 1184 1185 start_index = 0; 1186 index = 0; 1187 goto retry; 1188 } 1189 1190 if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) 1191 mapping->writeback_index = index; 1192 1193 out: 1194 ceph_osdc_put_request(req); 1195 ceph_put_snap_context(last_snapc); 1196 dout("writepages dend - startone, rc = %d\n", rc); 1197 return rc; 1198 } 1199 1200 1201 1202 /* 1203 * See if a given @snapc is either writeable, or already written. 1204 */ 1205 static int context_is_writeable_or_written(struct inode *inode, 1206 struct ceph_snap_context *snapc) 1207 { 1208 struct ceph_snap_context *oldest = get_oldest_context(inode, NULL, NULL); 1209 int ret = !oldest || snapc->seq <= oldest->seq; 1210 1211 ceph_put_snap_context(oldest); 1212 return ret; 1213 } 1214 1215 /* 1216 * We are only allowed to write into/dirty the page if the page is 1217 * clean, or already dirty within the same snap context. 1218 * 1219 * called with page locked. 1220 * return success with page locked, 1221 * or any failure (incl -EAGAIN) with page unlocked. 1222 */ 1223 static int ceph_update_writeable_page(struct file *file, 1224 loff_t pos, unsigned len, 1225 struct page *page) 1226 { 1227 struct inode *inode = file_inode(file); 1228 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 1229 struct ceph_inode_info *ci = ceph_inode(inode); 1230 loff_t page_off = pos & PAGE_MASK; 1231 int pos_in_page = pos & ~PAGE_MASK; 1232 int end_in_page = pos_in_page + len; 1233 loff_t i_size; 1234 int r; 1235 struct ceph_snap_context *snapc, *oldest; 1236 1237 if (READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) { 1238 dout(" page %p forced umount\n", page); 1239 unlock_page(page); 1240 return -EIO; 1241 } 1242 1243 retry_locked: 1244 /* writepages currently holds page lock, but if we change that later, */ 1245 wait_on_page_writeback(page); 1246 1247 snapc = page_snap_context(page); 1248 if (snapc && snapc != ci->i_head_snapc) { 1249 /* 1250 * this page is already dirty in another (older) snap 1251 * context! is it writeable now? 1252 */ 1253 oldest = get_oldest_context(inode, NULL, NULL); 1254 if (snapc->seq > oldest->seq) { 1255 ceph_put_snap_context(oldest); 1256 dout(" page %p snapc %p not current or oldest\n", 1257 page, snapc); 1258 /* 1259 * queue for writeback, and wait for snapc to 1260 * be writeable or written 1261 */ 1262 snapc = ceph_get_snap_context(snapc); 1263 unlock_page(page); 1264 ceph_queue_writeback(inode); 1265 r = wait_event_killable(ci->i_cap_wq, 1266 context_is_writeable_or_written(inode, snapc)); 1267 ceph_put_snap_context(snapc); 1268 if (r == -ERESTARTSYS) 1269 return r; 1270 return -EAGAIN; 1271 } 1272 ceph_put_snap_context(oldest); 1273 1274 /* yay, writeable, do it now (without dropping page lock) */ 1275 dout(" page %p snapc %p not current, but oldest\n", 1276 page, snapc); 1277 if (!clear_page_dirty_for_io(page)) 1278 goto retry_locked; 1279 r = writepage_nounlock(page, NULL); 1280 if (r < 0) 1281 goto fail_unlock; 1282 goto retry_locked; 1283 } 1284 1285 if (PageUptodate(page)) { 1286 dout(" page %p already uptodate\n", page); 1287 return 0; 1288 } 1289 1290 /* full page? */ 1291 if (pos_in_page == 0 && len == PAGE_SIZE) 1292 return 0; 1293 1294 /* past end of file? */ 1295 i_size = i_size_read(inode); 1296 1297 if (page_off >= i_size || 1298 (pos_in_page == 0 && (pos+len) >= i_size && 1299 end_in_page - pos_in_page != PAGE_SIZE)) { 1300 dout(" zeroing %p 0 - %d and %d - %d\n", 1301 page, pos_in_page, end_in_page, (int)PAGE_SIZE); 1302 zero_user_segments(page, 1303 0, pos_in_page, 1304 end_in_page, PAGE_SIZE); 1305 return 0; 1306 } 1307 1308 /* we need to read it. */ 1309 r = ceph_do_readpage(file, page); 1310 if (r < 0) { 1311 if (r == -EINPROGRESS) 1312 return -EAGAIN; 1313 goto fail_unlock; 1314 } 1315 goto retry_locked; 1316 fail_unlock: 1317 unlock_page(page); 1318 return r; 1319 } 1320 1321 /* 1322 * We are only allowed to write into/dirty the page if the page is 1323 * clean, or already dirty within the same snap context. 1324 */ 1325 static int ceph_write_begin(struct file *file, struct address_space *mapping, 1326 loff_t pos, unsigned len, unsigned flags, 1327 struct page **pagep, void **fsdata) 1328 { 1329 struct inode *inode = file_inode(file); 1330 struct page *page; 1331 pgoff_t index = pos >> PAGE_SHIFT; 1332 int r; 1333 1334 do { 1335 /* get a page */ 1336 page = grab_cache_page_write_begin(mapping, index, 0); 1337 if (!page) 1338 return -ENOMEM; 1339 1340 dout("write_begin file %p inode %p page %p %d~%d\n", file, 1341 inode, page, (int)pos, (int)len); 1342 1343 r = ceph_update_writeable_page(file, pos, len, page); 1344 if (r < 0) 1345 put_page(page); 1346 else 1347 *pagep = page; 1348 } while (r == -EAGAIN); 1349 1350 return r; 1351 } 1352 1353 /* 1354 * we don't do anything in here that simple_write_end doesn't do 1355 * except adjust dirty page accounting 1356 */ 1357 static int ceph_write_end(struct file *file, struct address_space *mapping, 1358 loff_t pos, unsigned len, unsigned copied, 1359 struct page *page, void *fsdata) 1360 { 1361 struct inode *inode = file_inode(file); 1362 bool check_cap = false; 1363 1364 dout("write_end file %p inode %p page %p %d~%d (%d)\n", file, 1365 inode, page, (int)pos, (int)copied, (int)len); 1366 1367 /* zero the stale part of the page if we did a short copy */ 1368 if (!PageUptodate(page)) { 1369 if (copied < len) { 1370 copied = 0; 1371 goto out; 1372 } 1373 SetPageUptodate(page); 1374 } 1375 1376 /* did file size increase? */ 1377 if (pos+copied > i_size_read(inode)) 1378 check_cap = ceph_inode_set_size(inode, pos+copied); 1379 1380 set_page_dirty(page); 1381 1382 out: 1383 unlock_page(page); 1384 put_page(page); 1385 1386 if (check_cap) 1387 ceph_check_caps(ceph_inode(inode), CHECK_CAPS_AUTHONLY, NULL); 1388 1389 return copied; 1390 } 1391 1392 /* 1393 * we set .direct_IO to indicate direct io is supported, but since we 1394 * intercept O_DIRECT reads and writes early, this function should 1395 * never get called. 1396 */ 1397 static ssize_t ceph_direct_io(struct kiocb *iocb, struct iov_iter *iter) 1398 { 1399 WARN_ON(1); 1400 return -EINVAL; 1401 } 1402 1403 const struct address_space_operations ceph_aops = { 1404 .readpage = ceph_readpage, 1405 .readpages = ceph_readpages, 1406 .writepage = ceph_writepage, 1407 .writepages = ceph_writepages_start, 1408 .write_begin = ceph_write_begin, 1409 .write_end = ceph_write_end, 1410 .set_page_dirty = ceph_set_page_dirty, 1411 .invalidatepage = ceph_invalidatepage, 1412 .releasepage = ceph_releasepage, 1413 .direct_IO = ceph_direct_io, 1414 }; 1415 1416 static void ceph_block_sigs(sigset_t *oldset) 1417 { 1418 sigset_t mask; 1419 siginitsetinv(&mask, sigmask(SIGKILL)); 1420 sigprocmask(SIG_BLOCK, &mask, oldset); 1421 } 1422 1423 static void ceph_restore_sigs(sigset_t *oldset) 1424 { 1425 sigprocmask(SIG_SETMASK, oldset, NULL); 1426 } 1427 1428 /* 1429 * vm ops 1430 */ 1431 static vm_fault_t ceph_filemap_fault(struct vm_fault *vmf) 1432 { 1433 struct vm_area_struct *vma = vmf->vma; 1434 struct inode *inode = file_inode(vma->vm_file); 1435 struct ceph_inode_info *ci = ceph_inode(inode); 1436 struct ceph_file_info *fi = vma->vm_file->private_data; 1437 struct page *pinned_page = NULL; 1438 loff_t off = vmf->pgoff << PAGE_SHIFT; 1439 int want, got, err; 1440 sigset_t oldset; 1441 vm_fault_t ret = VM_FAULT_SIGBUS; 1442 1443 ceph_block_sigs(&oldset); 1444 1445 dout("filemap_fault %p %llx.%llx %llu~%zd trying to get caps\n", 1446 inode, ceph_vinop(inode), off, (size_t)PAGE_SIZE); 1447 if (fi->fmode & CEPH_FILE_MODE_LAZY) 1448 want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO; 1449 else 1450 want = CEPH_CAP_FILE_CACHE; 1451 1452 got = 0; 1453 err = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, -1, &got, &pinned_page); 1454 if (err < 0) 1455 goto out_restore; 1456 1457 dout("filemap_fault %p %llu~%zd got cap refs on %s\n", 1458 inode, off, (size_t)PAGE_SIZE, ceph_cap_string(got)); 1459 1460 if ((got & (CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO)) || 1461 ci->i_inline_version == CEPH_INLINE_NONE) { 1462 CEPH_DEFINE_RW_CONTEXT(rw_ctx, got); 1463 ceph_add_rw_context(fi, &rw_ctx); 1464 ret = filemap_fault(vmf); 1465 ceph_del_rw_context(fi, &rw_ctx); 1466 dout("filemap_fault %p %llu~%zd drop cap refs %s ret %x\n", 1467 inode, off, (size_t)PAGE_SIZE, 1468 ceph_cap_string(got), ret); 1469 } else 1470 err = -EAGAIN; 1471 1472 if (pinned_page) 1473 put_page(pinned_page); 1474 ceph_put_cap_refs(ci, got); 1475 1476 if (err != -EAGAIN) 1477 goto out_restore; 1478 1479 /* read inline data */ 1480 if (off >= PAGE_SIZE) { 1481 /* does not support inline data > PAGE_SIZE */ 1482 ret = VM_FAULT_SIGBUS; 1483 } else { 1484 struct address_space *mapping = inode->i_mapping; 1485 struct page *page = find_or_create_page(mapping, 0, 1486 mapping_gfp_constraint(mapping, 1487 ~__GFP_FS)); 1488 if (!page) { 1489 ret = VM_FAULT_OOM; 1490 goto out_inline; 1491 } 1492 err = __ceph_do_getattr(inode, page, 1493 CEPH_STAT_CAP_INLINE_DATA, true); 1494 if (err < 0 || off >= i_size_read(inode)) { 1495 unlock_page(page); 1496 put_page(page); 1497 if (err == -ENOMEM) 1498 ret = VM_FAULT_OOM; 1499 else 1500 ret = VM_FAULT_SIGBUS; 1501 goto out_inline; 1502 } 1503 if (err < PAGE_SIZE) 1504 zero_user_segment(page, err, PAGE_SIZE); 1505 else 1506 flush_dcache_page(page); 1507 SetPageUptodate(page); 1508 vmf->page = page; 1509 ret = VM_FAULT_MAJOR | VM_FAULT_LOCKED; 1510 out_inline: 1511 dout("filemap_fault %p %llu~%zd read inline data ret %x\n", 1512 inode, off, (size_t)PAGE_SIZE, ret); 1513 } 1514 out_restore: 1515 ceph_restore_sigs(&oldset); 1516 if (err < 0) 1517 ret = vmf_error(err); 1518 1519 return ret; 1520 } 1521 1522 /* 1523 * Reuse write_begin here for simplicity. 1524 */ 1525 static vm_fault_t ceph_page_mkwrite(struct vm_fault *vmf) 1526 { 1527 struct vm_area_struct *vma = vmf->vma; 1528 struct inode *inode = file_inode(vma->vm_file); 1529 struct ceph_inode_info *ci = ceph_inode(inode); 1530 struct ceph_file_info *fi = vma->vm_file->private_data; 1531 struct ceph_cap_flush *prealloc_cf; 1532 struct page *page = vmf->page; 1533 loff_t off = page_offset(page); 1534 loff_t size = i_size_read(inode); 1535 size_t len; 1536 int want, got, err; 1537 sigset_t oldset; 1538 vm_fault_t ret = VM_FAULT_SIGBUS; 1539 1540 prealloc_cf = ceph_alloc_cap_flush(); 1541 if (!prealloc_cf) 1542 return VM_FAULT_OOM; 1543 1544 ceph_block_sigs(&oldset); 1545 1546 if (ci->i_inline_version != CEPH_INLINE_NONE) { 1547 struct page *locked_page = NULL; 1548 if (off == 0) { 1549 lock_page(page); 1550 locked_page = page; 1551 } 1552 err = ceph_uninline_data(vma->vm_file, locked_page); 1553 if (locked_page) 1554 unlock_page(locked_page); 1555 if (err < 0) 1556 goto out_free; 1557 } 1558 1559 if (off + PAGE_SIZE <= size) 1560 len = PAGE_SIZE; 1561 else 1562 len = size & ~PAGE_MASK; 1563 1564 dout("page_mkwrite %p %llx.%llx %llu~%zd getting caps i_size %llu\n", 1565 inode, ceph_vinop(inode), off, len, size); 1566 if (fi->fmode & CEPH_FILE_MODE_LAZY) 1567 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO; 1568 else 1569 want = CEPH_CAP_FILE_BUFFER; 1570 1571 got = 0; 1572 err = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, off + len, 1573 &got, NULL); 1574 if (err < 0) 1575 goto out_free; 1576 1577 dout("page_mkwrite %p %llu~%zd got cap refs on %s\n", 1578 inode, off, len, ceph_cap_string(got)); 1579 1580 /* Update time before taking page lock */ 1581 file_update_time(vma->vm_file); 1582 1583 do { 1584 lock_page(page); 1585 1586 if ((off > size) || (page->mapping != inode->i_mapping)) { 1587 unlock_page(page); 1588 ret = VM_FAULT_NOPAGE; 1589 break; 1590 } 1591 1592 err = ceph_update_writeable_page(vma->vm_file, off, len, page); 1593 if (err >= 0) { 1594 /* success. we'll keep the page locked. */ 1595 set_page_dirty(page); 1596 ret = VM_FAULT_LOCKED; 1597 } 1598 } while (err == -EAGAIN); 1599 1600 if (ret == VM_FAULT_LOCKED || 1601 ci->i_inline_version != CEPH_INLINE_NONE) { 1602 int dirty; 1603 spin_lock(&ci->i_ceph_lock); 1604 ci->i_inline_version = CEPH_INLINE_NONE; 1605 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR, 1606 &prealloc_cf); 1607 spin_unlock(&ci->i_ceph_lock); 1608 if (dirty) 1609 __mark_inode_dirty(inode, dirty); 1610 } 1611 1612 dout("page_mkwrite %p %llu~%zd dropping cap refs on %s ret %x\n", 1613 inode, off, len, ceph_cap_string(got), ret); 1614 ceph_put_cap_refs(ci, got); 1615 out_free: 1616 ceph_restore_sigs(&oldset); 1617 ceph_free_cap_flush(prealloc_cf); 1618 if (err < 0) 1619 ret = vmf_error(err); 1620 return ret; 1621 } 1622 1623 void ceph_fill_inline_data(struct inode *inode, struct page *locked_page, 1624 char *data, size_t len) 1625 { 1626 struct address_space *mapping = inode->i_mapping; 1627 struct page *page; 1628 1629 if (locked_page) { 1630 page = locked_page; 1631 } else { 1632 if (i_size_read(inode) == 0) 1633 return; 1634 page = find_or_create_page(mapping, 0, 1635 mapping_gfp_constraint(mapping, 1636 ~__GFP_FS)); 1637 if (!page) 1638 return; 1639 if (PageUptodate(page)) { 1640 unlock_page(page); 1641 put_page(page); 1642 return; 1643 } 1644 } 1645 1646 dout("fill_inline_data %p %llx.%llx len %zu locked_page %p\n", 1647 inode, ceph_vinop(inode), len, locked_page); 1648 1649 if (len > 0) { 1650 void *kaddr = kmap_atomic(page); 1651 memcpy(kaddr, data, len); 1652 kunmap_atomic(kaddr); 1653 } 1654 1655 if (page != locked_page) { 1656 if (len < PAGE_SIZE) 1657 zero_user_segment(page, len, PAGE_SIZE); 1658 else 1659 flush_dcache_page(page); 1660 1661 SetPageUptodate(page); 1662 unlock_page(page); 1663 put_page(page); 1664 } 1665 } 1666 1667 int ceph_uninline_data(struct file *filp, struct page *locked_page) 1668 { 1669 struct inode *inode = file_inode(filp); 1670 struct ceph_inode_info *ci = ceph_inode(inode); 1671 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 1672 struct ceph_osd_request *req; 1673 struct page *page = NULL; 1674 u64 len, inline_version; 1675 int err = 0; 1676 bool from_pagecache = false; 1677 1678 spin_lock(&ci->i_ceph_lock); 1679 inline_version = ci->i_inline_version; 1680 spin_unlock(&ci->i_ceph_lock); 1681 1682 dout("uninline_data %p %llx.%llx inline_version %llu\n", 1683 inode, ceph_vinop(inode), inline_version); 1684 1685 if (inline_version == 1 || /* initial version, no data */ 1686 inline_version == CEPH_INLINE_NONE) 1687 goto out; 1688 1689 if (locked_page) { 1690 page = locked_page; 1691 WARN_ON(!PageUptodate(page)); 1692 } else if (ceph_caps_issued(ci) & 1693 (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) { 1694 page = find_get_page(inode->i_mapping, 0); 1695 if (page) { 1696 if (PageUptodate(page)) { 1697 from_pagecache = true; 1698 lock_page(page); 1699 } else { 1700 put_page(page); 1701 page = NULL; 1702 } 1703 } 1704 } 1705 1706 if (page) { 1707 len = i_size_read(inode); 1708 if (len > PAGE_SIZE) 1709 len = PAGE_SIZE; 1710 } else { 1711 page = __page_cache_alloc(GFP_NOFS); 1712 if (!page) { 1713 err = -ENOMEM; 1714 goto out; 1715 } 1716 err = __ceph_do_getattr(inode, page, 1717 CEPH_STAT_CAP_INLINE_DATA, true); 1718 if (err < 0) { 1719 /* no inline data */ 1720 if (err == -ENODATA) 1721 err = 0; 1722 goto out; 1723 } 1724 len = err; 1725 } 1726 1727 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, 1728 ceph_vino(inode), 0, &len, 0, 1, 1729 CEPH_OSD_OP_CREATE, CEPH_OSD_FLAG_WRITE, 1730 NULL, 0, 0, false); 1731 if (IS_ERR(req)) { 1732 err = PTR_ERR(req); 1733 goto out; 1734 } 1735 1736 req->r_mtime = inode->i_mtime; 1737 err = ceph_osdc_start_request(&fsc->client->osdc, req, false); 1738 if (!err) 1739 err = ceph_osdc_wait_request(&fsc->client->osdc, req); 1740 ceph_osdc_put_request(req); 1741 if (err < 0) 1742 goto out; 1743 1744 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, 1745 ceph_vino(inode), 0, &len, 1, 3, 1746 CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE, 1747 NULL, ci->i_truncate_seq, 1748 ci->i_truncate_size, false); 1749 if (IS_ERR(req)) { 1750 err = PTR_ERR(req); 1751 goto out; 1752 } 1753 1754 osd_req_op_extent_osd_data_pages(req, 1, &page, len, 0, false, false); 1755 1756 { 1757 __le64 xattr_buf = cpu_to_le64(inline_version); 1758 err = osd_req_op_xattr_init(req, 0, CEPH_OSD_OP_CMPXATTR, 1759 "inline_version", &xattr_buf, 1760 sizeof(xattr_buf), 1761 CEPH_OSD_CMPXATTR_OP_GT, 1762 CEPH_OSD_CMPXATTR_MODE_U64); 1763 if (err) 1764 goto out_put; 1765 } 1766 1767 { 1768 char xattr_buf[32]; 1769 int xattr_len = snprintf(xattr_buf, sizeof(xattr_buf), 1770 "%llu", inline_version); 1771 err = osd_req_op_xattr_init(req, 2, CEPH_OSD_OP_SETXATTR, 1772 "inline_version", 1773 xattr_buf, xattr_len, 0, 0); 1774 if (err) 1775 goto out_put; 1776 } 1777 1778 req->r_mtime = inode->i_mtime; 1779 err = ceph_osdc_start_request(&fsc->client->osdc, req, false); 1780 if (!err) 1781 err = ceph_osdc_wait_request(&fsc->client->osdc, req); 1782 out_put: 1783 ceph_osdc_put_request(req); 1784 if (err == -ECANCELED) 1785 err = 0; 1786 out: 1787 if (page && page != locked_page) { 1788 if (from_pagecache) { 1789 unlock_page(page); 1790 put_page(page); 1791 } else 1792 __free_pages(page, 0); 1793 } 1794 1795 dout("uninline_data %p %llx.%llx inline_version %llu = %d\n", 1796 inode, ceph_vinop(inode), inline_version, err); 1797 return err; 1798 } 1799 1800 static const struct vm_operations_struct ceph_vmops = { 1801 .fault = ceph_filemap_fault, 1802 .page_mkwrite = ceph_page_mkwrite, 1803 }; 1804 1805 int ceph_mmap(struct file *file, struct vm_area_struct *vma) 1806 { 1807 struct address_space *mapping = file->f_mapping; 1808 1809 if (!mapping->a_ops->readpage) 1810 return -ENOEXEC; 1811 file_accessed(file); 1812 vma->vm_ops = &ceph_vmops; 1813 return 0; 1814 } 1815 1816 enum { 1817 POOL_READ = 1, 1818 POOL_WRITE = 2, 1819 }; 1820 1821 static int __ceph_pool_perm_get(struct ceph_inode_info *ci, 1822 s64 pool, struct ceph_string *pool_ns) 1823 { 1824 struct ceph_fs_client *fsc = ceph_inode_to_client(&ci->vfs_inode); 1825 struct ceph_mds_client *mdsc = fsc->mdsc; 1826 struct ceph_osd_request *rd_req = NULL, *wr_req = NULL; 1827 struct rb_node **p, *parent; 1828 struct ceph_pool_perm *perm; 1829 struct page **pages; 1830 size_t pool_ns_len; 1831 int err = 0, err2 = 0, have = 0; 1832 1833 down_read(&mdsc->pool_perm_rwsem); 1834 p = &mdsc->pool_perm_tree.rb_node; 1835 while (*p) { 1836 perm = rb_entry(*p, struct ceph_pool_perm, node); 1837 if (pool < perm->pool) 1838 p = &(*p)->rb_left; 1839 else if (pool > perm->pool) 1840 p = &(*p)->rb_right; 1841 else { 1842 int ret = ceph_compare_string(pool_ns, 1843 perm->pool_ns, 1844 perm->pool_ns_len); 1845 if (ret < 0) 1846 p = &(*p)->rb_left; 1847 else if (ret > 0) 1848 p = &(*p)->rb_right; 1849 else { 1850 have = perm->perm; 1851 break; 1852 } 1853 } 1854 } 1855 up_read(&mdsc->pool_perm_rwsem); 1856 if (*p) 1857 goto out; 1858 1859 if (pool_ns) 1860 dout("__ceph_pool_perm_get pool %lld ns %.*s no perm cached\n", 1861 pool, (int)pool_ns->len, pool_ns->str); 1862 else 1863 dout("__ceph_pool_perm_get pool %lld no perm cached\n", pool); 1864 1865 down_write(&mdsc->pool_perm_rwsem); 1866 p = &mdsc->pool_perm_tree.rb_node; 1867 parent = NULL; 1868 while (*p) { 1869 parent = *p; 1870 perm = rb_entry(parent, struct ceph_pool_perm, node); 1871 if (pool < perm->pool) 1872 p = &(*p)->rb_left; 1873 else if (pool > perm->pool) 1874 p = &(*p)->rb_right; 1875 else { 1876 int ret = ceph_compare_string(pool_ns, 1877 perm->pool_ns, 1878 perm->pool_ns_len); 1879 if (ret < 0) 1880 p = &(*p)->rb_left; 1881 else if (ret > 0) 1882 p = &(*p)->rb_right; 1883 else { 1884 have = perm->perm; 1885 break; 1886 } 1887 } 1888 } 1889 if (*p) { 1890 up_write(&mdsc->pool_perm_rwsem); 1891 goto out; 1892 } 1893 1894 rd_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL, 1895 1, false, GFP_NOFS); 1896 if (!rd_req) { 1897 err = -ENOMEM; 1898 goto out_unlock; 1899 } 1900 1901 rd_req->r_flags = CEPH_OSD_FLAG_READ; 1902 osd_req_op_init(rd_req, 0, CEPH_OSD_OP_STAT, 0); 1903 rd_req->r_base_oloc.pool = pool; 1904 if (pool_ns) 1905 rd_req->r_base_oloc.pool_ns = ceph_get_string(pool_ns); 1906 ceph_oid_printf(&rd_req->r_base_oid, "%llx.00000000", ci->i_vino.ino); 1907 1908 err = ceph_osdc_alloc_messages(rd_req, GFP_NOFS); 1909 if (err) 1910 goto out_unlock; 1911 1912 wr_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL, 1913 1, false, GFP_NOFS); 1914 if (!wr_req) { 1915 err = -ENOMEM; 1916 goto out_unlock; 1917 } 1918 1919 wr_req->r_flags = CEPH_OSD_FLAG_WRITE; 1920 osd_req_op_init(wr_req, 0, CEPH_OSD_OP_CREATE, CEPH_OSD_OP_FLAG_EXCL); 1921 ceph_oloc_copy(&wr_req->r_base_oloc, &rd_req->r_base_oloc); 1922 ceph_oid_copy(&wr_req->r_base_oid, &rd_req->r_base_oid); 1923 1924 err = ceph_osdc_alloc_messages(wr_req, GFP_NOFS); 1925 if (err) 1926 goto out_unlock; 1927 1928 /* one page should be large enough for STAT data */ 1929 pages = ceph_alloc_page_vector(1, GFP_KERNEL); 1930 if (IS_ERR(pages)) { 1931 err = PTR_ERR(pages); 1932 goto out_unlock; 1933 } 1934 1935 osd_req_op_raw_data_in_pages(rd_req, 0, pages, PAGE_SIZE, 1936 0, false, true); 1937 err = ceph_osdc_start_request(&fsc->client->osdc, rd_req, false); 1938 1939 wr_req->r_mtime = ci->vfs_inode.i_mtime; 1940 err2 = ceph_osdc_start_request(&fsc->client->osdc, wr_req, false); 1941 1942 if (!err) 1943 err = ceph_osdc_wait_request(&fsc->client->osdc, rd_req); 1944 if (!err2) 1945 err2 = ceph_osdc_wait_request(&fsc->client->osdc, wr_req); 1946 1947 if (err >= 0 || err == -ENOENT) 1948 have |= POOL_READ; 1949 else if (err != -EPERM) 1950 goto out_unlock; 1951 1952 if (err2 == 0 || err2 == -EEXIST) 1953 have |= POOL_WRITE; 1954 else if (err2 != -EPERM) { 1955 err = err2; 1956 goto out_unlock; 1957 } 1958 1959 pool_ns_len = pool_ns ? pool_ns->len : 0; 1960 perm = kmalloc(sizeof(*perm) + pool_ns_len + 1, GFP_NOFS); 1961 if (!perm) { 1962 err = -ENOMEM; 1963 goto out_unlock; 1964 } 1965 1966 perm->pool = pool; 1967 perm->perm = have; 1968 perm->pool_ns_len = pool_ns_len; 1969 if (pool_ns_len > 0) 1970 memcpy(perm->pool_ns, pool_ns->str, pool_ns_len); 1971 perm->pool_ns[pool_ns_len] = 0; 1972 1973 rb_link_node(&perm->node, parent, p); 1974 rb_insert_color(&perm->node, &mdsc->pool_perm_tree); 1975 err = 0; 1976 out_unlock: 1977 up_write(&mdsc->pool_perm_rwsem); 1978 1979 ceph_osdc_put_request(rd_req); 1980 ceph_osdc_put_request(wr_req); 1981 out: 1982 if (!err) 1983 err = have; 1984 if (pool_ns) 1985 dout("__ceph_pool_perm_get pool %lld ns %.*s result = %d\n", 1986 pool, (int)pool_ns->len, pool_ns->str, err); 1987 else 1988 dout("__ceph_pool_perm_get pool %lld result = %d\n", pool, err); 1989 return err; 1990 } 1991 1992 int ceph_pool_perm_check(struct ceph_inode_info *ci, int need) 1993 { 1994 s64 pool; 1995 struct ceph_string *pool_ns; 1996 int ret, flags; 1997 1998 if (ci->i_vino.snap != CEPH_NOSNAP) { 1999 /* 2000 * Pool permission check needs to write to the first object. 2001 * But for snapshot, head of the first object may have alread 2002 * been deleted. Skip check to avoid creating orphan object. 2003 */ 2004 return 0; 2005 } 2006 2007 if (ceph_test_mount_opt(ceph_inode_to_client(&ci->vfs_inode), 2008 NOPOOLPERM)) 2009 return 0; 2010 2011 spin_lock(&ci->i_ceph_lock); 2012 flags = ci->i_ceph_flags; 2013 pool = ci->i_layout.pool_id; 2014 spin_unlock(&ci->i_ceph_lock); 2015 check: 2016 if (flags & CEPH_I_POOL_PERM) { 2017 if ((need & CEPH_CAP_FILE_RD) && !(flags & CEPH_I_POOL_RD)) { 2018 dout("ceph_pool_perm_check pool %lld no read perm\n", 2019 pool); 2020 return -EPERM; 2021 } 2022 if ((need & CEPH_CAP_FILE_WR) && !(flags & CEPH_I_POOL_WR)) { 2023 dout("ceph_pool_perm_check pool %lld no write perm\n", 2024 pool); 2025 return -EPERM; 2026 } 2027 return 0; 2028 } 2029 2030 pool_ns = ceph_try_get_string(ci->i_layout.pool_ns); 2031 ret = __ceph_pool_perm_get(ci, pool, pool_ns); 2032 ceph_put_string(pool_ns); 2033 if (ret < 0) 2034 return ret; 2035 2036 flags = CEPH_I_POOL_PERM; 2037 if (ret & POOL_READ) 2038 flags |= CEPH_I_POOL_RD; 2039 if (ret & POOL_WRITE) 2040 flags |= CEPH_I_POOL_WR; 2041 2042 spin_lock(&ci->i_ceph_lock); 2043 if (pool == ci->i_layout.pool_id && 2044 pool_ns == rcu_dereference_raw(ci->i_layout.pool_ns)) { 2045 ci->i_ceph_flags |= flags; 2046 } else { 2047 pool = ci->i_layout.pool_id; 2048 flags = ci->i_ceph_flags; 2049 } 2050 spin_unlock(&ci->i_ceph_lock); 2051 goto check; 2052 } 2053 2054 void ceph_pool_perm_destroy(struct ceph_mds_client *mdsc) 2055 { 2056 struct ceph_pool_perm *perm; 2057 struct rb_node *n; 2058 2059 while (!RB_EMPTY_ROOT(&mdsc->pool_perm_tree)) { 2060 n = rb_first(&mdsc->pool_perm_tree); 2061 perm = rb_entry(n, struct ceph_pool_perm, node); 2062 rb_erase(n, &mdsc->pool_perm_tree); 2063 kfree(perm); 2064 } 2065 } 2066