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 #include <linux/iversion.h> 14 15 #include "super.h" 16 #include "mds_client.h" 17 #include "cache.h" 18 #include <linux/ceph/osd_client.h> 19 #include <linux/ceph/striper.h> 20 21 /* 22 * Ceph address space ops. 23 * 24 * There are a few funny things going on here. 25 * 26 * The page->private field is used to reference a struct 27 * ceph_snap_context for _every_ dirty page. This indicates which 28 * snapshot the page was logically dirtied in, and thus which snap 29 * context needs to be associated with the osd write during writeback. 30 * 31 * Similarly, struct ceph_inode_info maintains a set of counters to 32 * count dirty pages on the inode. In the absence of snapshots, 33 * i_wrbuffer_ref == i_wrbuffer_ref_head == the dirty page count. 34 * 35 * When a snapshot is taken (that is, when the client receives 36 * notification that a snapshot was taken), each inode with caps and 37 * with dirty pages (dirty pages implies there is a cap) gets a new 38 * ceph_cap_snap in the i_cap_snaps list (which is sorted in ascending 39 * order, new snaps go to the tail). The i_wrbuffer_ref_head count is 40 * moved to capsnap->dirty. (Unless a sync write is currently in 41 * progress. In that case, the capsnap is said to be "pending", new 42 * writes cannot start, and the capsnap isn't "finalized" until the 43 * write completes (or fails) and a final size/mtime for the inode for 44 * that snap can be settled upon.) i_wrbuffer_ref_head is reset to 0. 45 * 46 * On writeback, we must submit writes to the osd IN SNAP ORDER. So, 47 * we look for the first capsnap in i_cap_snaps and write out pages in 48 * that snap context _only_. Then we move on to the next capsnap, 49 * eventually reaching the "live" or "head" context (i.e., pages that 50 * are not yet snapped) and are writing the most recently dirtied 51 * pages. 52 * 53 * Invalidate and so forth must take care to ensure the dirty page 54 * accounting is preserved. 55 */ 56 57 #define CONGESTION_ON_THRESH(congestion_kb) (congestion_kb >> (PAGE_SHIFT-10)) 58 #define CONGESTION_OFF_THRESH(congestion_kb) \ 59 (CONGESTION_ON_THRESH(congestion_kb) - \ 60 (CONGESTION_ON_THRESH(congestion_kb) >> 2)) 61 62 static inline struct ceph_snap_context *page_snap_context(struct page *page) 63 { 64 if (PagePrivate(page)) 65 return (void *)page->private; 66 return NULL; 67 } 68 69 /* 70 * Dirty a page. Optimistically adjust accounting, on the assumption 71 * that we won't race with invalidate. If we do, readjust. 72 */ 73 static int ceph_set_page_dirty(struct page *page) 74 { 75 struct address_space *mapping = page->mapping; 76 struct inode *inode; 77 struct ceph_inode_info *ci; 78 struct ceph_snap_context *snapc; 79 int ret; 80 81 if (unlikely(!mapping)) 82 return !TestSetPageDirty(page); 83 84 if (PageDirty(page)) { 85 dout("%p set_page_dirty %p idx %lu -- already dirty\n", 86 mapping->host, page, page->index); 87 BUG_ON(!PagePrivate(page)); 88 return 0; 89 } 90 91 inode = mapping->host; 92 ci = ceph_inode(inode); 93 94 /* dirty the head */ 95 spin_lock(&ci->i_ceph_lock); 96 BUG_ON(ci->i_wr_ref == 0); // caller should hold Fw reference 97 if (__ceph_have_pending_cap_snap(ci)) { 98 struct ceph_cap_snap *capsnap = 99 list_last_entry(&ci->i_cap_snaps, 100 struct ceph_cap_snap, 101 ci_item); 102 snapc = ceph_get_snap_context(capsnap->context); 103 capsnap->dirty_pages++; 104 } else { 105 BUG_ON(!ci->i_head_snapc); 106 snapc = ceph_get_snap_context(ci->i_head_snapc); 107 ++ci->i_wrbuffer_ref_head; 108 } 109 if (ci->i_wrbuffer_ref == 0) 110 ihold(inode); 111 ++ci->i_wrbuffer_ref; 112 dout("%p set_page_dirty %p idx %lu head %d/%d -> %d/%d " 113 "snapc %p seq %lld (%d snaps)\n", 114 mapping->host, page, page->index, 115 ci->i_wrbuffer_ref-1, ci->i_wrbuffer_ref_head-1, 116 ci->i_wrbuffer_ref, ci->i_wrbuffer_ref_head, 117 snapc, snapc->seq, snapc->num_snaps); 118 spin_unlock(&ci->i_ceph_lock); 119 120 /* 121 * Reference snap context in page->private. Also set 122 * PagePrivate so that we get invalidatepage callback. 123 */ 124 BUG_ON(PagePrivate(page)); 125 page->private = (unsigned long)snapc; 126 SetPagePrivate(page); 127 128 ret = __set_page_dirty_nobuffers(page); 129 WARN_ON(!PageLocked(page)); 130 WARN_ON(!page->mapping); 131 132 return ret; 133 } 134 135 /* 136 * If we are truncating the full page (i.e. offset == 0), adjust the 137 * dirty page counters appropriately. Only called if there is private 138 * data on the page. 139 */ 140 static void ceph_invalidatepage(struct page *page, unsigned int offset, 141 unsigned int length) 142 { 143 struct inode *inode; 144 struct ceph_inode_info *ci; 145 struct ceph_snap_context *snapc = page_snap_context(page); 146 147 inode = page->mapping->host; 148 ci = ceph_inode(inode); 149 150 if (offset != 0 || length != PAGE_SIZE) { 151 dout("%p invalidatepage %p idx %lu partial dirty page %u~%u\n", 152 inode, page, page->index, offset, length); 153 return; 154 } 155 156 ceph_invalidate_fscache_page(inode, page); 157 158 WARN_ON(!PageLocked(page)); 159 if (!PagePrivate(page)) 160 return; 161 162 dout("%p invalidatepage %p idx %lu full dirty page\n", 163 inode, page, page->index); 164 165 ceph_put_wrbuffer_cap_refs(ci, 1, snapc); 166 ceph_put_snap_context(snapc); 167 page->private = 0; 168 ClearPagePrivate(page); 169 } 170 171 static int ceph_releasepage(struct page *page, gfp_t g) 172 { 173 dout("%p releasepage %p idx %lu (%sdirty)\n", page->mapping->host, 174 page, page->index, PageDirty(page) ? "" : "not "); 175 176 /* Can we release the page from the cache? */ 177 if (!ceph_release_fscache_page(page, g)) 178 return 0; 179 180 return !PagePrivate(page); 181 } 182 183 /* 184 * read a single page, without unlocking it. 185 */ 186 static int ceph_do_readpage(struct file *filp, struct page *page) 187 { 188 struct inode *inode = file_inode(filp); 189 struct ceph_inode_info *ci = ceph_inode(inode); 190 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 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(&fsc->client->osdc, ceph_vino(inode), 220 &ci->i_layout, 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 if (err == -EBLACKLISTED) 229 fsc->blacklisted = true; 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 if (rc == -EBLACKLISTED) 269 ceph_inode_to_client(inode)->blacklisted = true; 270 271 /* unlock all pages, zeroing any data we didn't read */ 272 osd_data = osd_req_op_extent_osd_data(req, 0); 273 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES); 274 num_pages = calc_pages_for((u64)osd_data->alignment, 275 (u64)osd_data->length); 276 for (i = 0; i < num_pages; i++) { 277 struct page *page = osd_data->pages[i]; 278 279 if (rc < 0 && rc != -ENOENT) { 280 ceph_fscache_readpage_cancel(inode, page); 281 goto unlock; 282 } 283 if (bytes < (int)PAGE_SIZE) { 284 /* zero (remainder of) page */ 285 int s = bytes < 0 ? 0 : bytes; 286 zero_user_segment(page, s, PAGE_SIZE); 287 } 288 dout("finish_read %p uptodate %p idx %lu\n", inode, page, 289 page->index); 290 flush_dcache_page(page); 291 SetPageUptodate(page); 292 ceph_readpage_to_fscache(inode, page); 293 unlock: 294 unlock_page(page); 295 put_page(page); 296 bytes -= PAGE_SIZE; 297 } 298 kfree(osd_data->pages); 299 } 300 301 /* 302 * start an async read(ahead) operation. return nr_pages we submitted 303 * a read for on success, or negative error code. 304 */ 305 static int start_read(struct inode *inode, struct ceph_rw_context *rw_ctx, 306 struct list_head *page_list, int max) 307 { 308 struct ceph_osd_client *osdc = 309 &ceph_inode_to_client(inode)->client->osdc; 310 struct ceph_inode_info *ci = ceph_inode(inode); 311 struct page *page = lru_to_page(page_list); 312 struct ceph_vino vino; 313 struct ceph_osd_request *req; 314 u64 off; 315 u64 len; 316 int i; 317 struct page **pages; 318 pgoff_t next_index; 319 int nr_pages = 0; 320 int got = 0; 321 int ret = 0; 322 323 if (!rw_ctx) { 324 /* caller of readpages does not hold buffer and read caps 325 * (fadvise, madvise and readahead cases) */ 326 int want = CEPH_CAP_FILE_CACHE; 327 ret = ceph_try_get_caps(inode, CEPH_CAP_FILE_RD, want, 328 true, &got); 329 if (ret < 0) { 330 dout("start_read %p, error getting cap\n", inode); 331 } else if (!(got & want)) { 332 dout("start_read %p, no cache cap\n", inode); 333 ret = 0; 334 } 335 if (ret <= 0) { 336 if (got) 337 ceph_put_cap_refs(ci, got); 338 while (!list_empty(page_list)) { 339 page = lru_to_page(page_list); 340 list_del(&page->lru); 341 put_page(page); 342 } 343 return ret; 344 } 345 } 346 347 off = (u64) page_offset(page); 348 349 /* count pages */ 350 next_index = page->index; 351 list_for_each_entry_reverse(page, page_list, lru) { 352 if (page->index != next_index) 353 break; 354 nr_pages++; 355 next_index++; 356 if (max && nr_pages == max) 357 break; 358 } 359 len = nr_pages << PAGE_SHIFT; 360 dout("start_read %p nr_pages %d is %lld~%lld\n", inode, nr_pages, 361 off, len); 362 vino = ceph_vino(inode); 363 req = ceph_osdc_new_request(osdc, &ci->i_layout, vino, off, &len, 364 0, 1, CEPH_OSD_OP_READ, 365 CEPH_OSD_FLAG_READ, NULL, 366 ci->i_truncate_seq, ci->i_truncate_size, 367 false); 368 if (IS_ERR(req)) { 369 ret = PTR_ERR(req); 370 goto out; 371 } 372 373 /* build page vector */ 374 nr_pages = calc_pages_for(0, len); 375 pages = kmalloc_array(nr_pages, sizeof(*pages), GFP_KERNEL); 376 if (!pages) { 377 ret = -ENOMEM; 378 goto out_put; 379 } 380 for (i = 0; i < nr_pages; ++i) { 381 page = list_entry(page_list->prev, struct page, lru); 382 BUG_ON(PageLocked(page)); 383 list_del(&page->lru); 384 385 dout("start_read %p adding %p idx %lu\n", inode, page, 386 page->index); 387 if (add_to_page_cache_lru(page, &inode->i_data, page->index, 388 GFP_KERNEL)) { 389 ceph_fscache_uncache_page(inode, page); 390 put_page(page); 391 dout("start_read %p add_to_page_cache failed %p\n", 392 inode, page); 393 nr_pages = i; 394 if (nr_pages > 0) { 395 len = nr_pages << PAGE_SHIFT; 396 osd_req_op_extent_update(req, 0, len); 397 break; 398 } 399 goto out_pages; 400 } 401 pages[i] = page; 402 } 403 osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0, false, false); 404 req->r_callback = finish_read; 405 req->r_inode = inode; 406 407 dout("start_read %p starting %p %lld~%lld\n", inode, req, off, len); 408 ret = ceph_osdc_start_request(osdc, req, false); 409 if (ret < 0) 410 goto out_pages; 411 ceph_osdc_put_request(req); 412 413 /* After adding locked pages to page cache, the inode holds cache cap. 414 * So we can drop our cap refs. */ 415 if (got) 416 ceph_put_cap_refs(ci, got); 417 418 return nr_pages; 419 420 out_pages: 421 for (i = 0; i < nr_pages; ++i) { 422 ceph_fscache_readpage_cancel(inode, pages[i]); 423 unlock_page(pages[i]); 424 } 425 ceph_put_page_vector(pages, nr_pages, false); 426 out_put: 427 ceph_osdc_put_request(req); 428 out: 429 if (got) 430 ceph_put_cap_refs(ci, got); 431 return ret; 432 } 433 434 435 /* 436 * Read multiple pages. Leave pages we don't read + unlock in page_list; 437 * the caller (VM) cleans them up. 438 */ 439 static int ceph_readpages(struct file *file, struct address_space *mapping, 440 struct list_head *page_list, unsigned nr_pages) 441 { 442 struct inode *inode = file_inode(file); 443 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 444 struct ceph_file_info *fi = file->private_data; 445 struct ceph_rw_context *rw_ctx; 446 int rc = 0; 447 int max = 0; 448 449 if (ceph_inode(inode)->i_inline_version != CEPH_INLINE_NONE) 450 return -EINVAL; 451 452 rc = ceph_readpages_from_fscache(mapping->host, mapping, page_list, 453 &nr_pages); 454 455 if (rc == 0) 456 goto out; 457 458 rw_ctx = ceph_find_rw_context(fi); 459 max = fsc->mount_options->rsize >> PAGE_SHIFT; 460 dout("readpages %p file %p ctx %p nr_pages %d max %d\n", 461 inode, file, rw_ctx, nr_pages, max); 462 while (!list_empty(page_list)) { 463 rc = start_read(inode, rw_ctx, page_list, max); 464 if (rc < 0) 465 goto out; 466 } 467 out: 468 ceph_fscache_readpages_cancel(inode, page_list); 469 470 dout("readpages %p file %p ret %d\n", inode, file, rc); 471 return rc; 472 } 473 474 struct ceph_writeback_ctl 475 { 476 loff_t i_size; 477 u64 truncate_size; 478 u32 truncate_seq; 479 bool size_stable; 480 bool head_snapc; 481 }; 482 483 /* 484 * Get ref for the oldest snapc for an inode with dirty data... that is, the 485 * only snap context we are allowed to write back. 486 */ 487 static struct ceph_snap_context * 488 get_oldest_context(struct inode *inode, struct ceph_writeback_ctl *ctl, 489 struct ceph_snap_context *page_snapc) 490 { 491 struct ceph_inode_info *ci = ceph_inode(inode); 492 struct ceph_snap_context *snapc = NULL; 493 struct ceph_cap_snap *capsnap = NULL; 494 495 spin_lock(&ci->i_ceph_lock); 496 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) { 497 dout(" cap_snap %p snapc %p has %d dirty pages\n", capsnap, 498 capsnap->context, capsnap->dirty_pages); 499 if (!capsnap->dirty_pages) 500 continue; 501 502 /* get i_size, truncate_{seq,size} for page_snapc? */ 503 if (snapc && capsnap->context != page_snapc) 504 continue; 505 506 if (ctl) { 507 if (capsnap->writing) { 508 ctl->i_size = i_size_read(inode); 509 ctl->size_stable = false; 510 } else { 511 ctl->i_size = capsnap->size; 512 ctl->size_stable = true; 513 } 514 ctl->truncate_size = capsnap->truncate_size; 515 ctl->truncate_seq = capsnap->truncate_seq; 516 ctl->head_snapc = false; 517 } 518 519 if (snapc) 520 break; 521 522 snapc = ceph_get_snap_context(capsnap->context); 523 if (!page_snapc || 524 page_snapc == snapc || 525 page_snapc->seq > snapc->seq) 526 break; 527 } 528 if (!snapc && ci->i_wrbuffer_ref_head) { 529 snapc = ceph_get_snap_context(ci->i_head_snapc); 530 dout(" head snapc %p has %d dirty pages\n", 531 snapc, ci->i_wrbuffer_ref_head); 532 if (ctl) { 533 ctl->i_size = i_size_read(inode); 534 ctl->truncate_size = ci->i_truncate_size; 535 ctl->truncate_seq = ci->i_truncate_seq; 536 ctl->size_stable = false; 537 ctl->head_snapc = true; 538 } 539 } 540 spin_unlock(&ci->i_ceph_lock); 541 return snapc; 542 } 543 544 static u64 get_writepages_data_length(struct inode *inode, 545 struct page *page, u64 start) 546 { 547 struct ceph_inode_info *ci = ceph_inode(inode); 548 struct ceph_snap_context *snapc = page_snap_context(page); 549 struct ceph_cap_snap *capsnap = NULL; 550 u64 end = i_size_read(inode); 551 552 if (snapc != ci->i_head_snapc) { 553 bool found = false; 554 spin_lock(&ci->i_ceph_lock); 555 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) { 556 if (capsnap->context == snapc) { 557 if (!capsnap->writing) 558 end = capsnap->size; 559 found = true; 560 break; 561 } 562 } 563 spin_unlock(&ci->i_ceph_lock); 564 WARN_ON(!found); 565 } 566 if (end > page_offset(page) + PAGE_SIZE) 567 end = page_offset(page) + PAGE_SIZE; 568 return end > start ? end - start : 0; 569 } 570 571 /* 572 * Write a single page, but leave the page locked. 573 * 574 * If we get a write error, mark the mapping for error, but still adjust the 575 * dirty page accounting (i.e., page is no longer dirty). 576 */ 577 static int writepage_nounlock(struct page *page, struct writeback_control *wbc) 578 { 579 struct inode *inode; 580 struct ceph_inode_info *ci; 581 struct ceph_fs_client *fsc; 582 struct ceph_snap_context *snapc, *oldest; 583 loff_t page_off = page_offset(page); 584 int err, len = PAGE_SIZE; 585 struct ceph_writeback_ctl ceph_wbc; 586 587 dout("writepage %p idx %lu\n", page, page->index); 588 589 inode = page->mapping->host; 590 ci = ceph_inode(inode); 591 fsc = ceph_inode_to_client(inode); 592 593 /* verify this is a writeable snap context */ 594 snapc = page_snap_context(page); 595 if (!snapc) { 596 dout("writepage %p page %p not dirty?\n", inode, page); 597 return 0; 598 } 599 oldest = get_oldest_context(inode, &ceph_wbc, snapc); 600 if (snapc->seq > oldest->seq) { 601 dout("writepage %p page %p snapc %p not writeable - noop\n", 602 inode, page, snapc); 603 /* we should only noop if called by kswapd */ 604 WARN_ON(!(current->flags & PF_MEMALLOC)); 605 ceph_put_snap_context(oldest); 606 redirty_page_for_writepage(wbc, page); 607 return 0; 608 } 609 ceph_put_snap_context(oldest); 610 611 /* is this a partial page at end of file? */ 612 if (page_off >= ceph_wbc.i_size) { 613 dout("%p page eof %llu\n", page, ceph_wbc.i_size); 614 page->mapping->a_ops->invalidatepage(page, 0, PAGE_SIZE); 615 return 0; 616 } 617 618 if (ceph_wbc.i_size < page_off + len) 619 len = ceph_wbc.i_size - page_off; 620 621 dout("writepage %p page %p index %lu on %llu~%u snapc %p seq %lld\n", 622 inode, page, page->index, page_off, len, snapc, snapc->seq); 623 624 if (atomic_long_inc_return(&fsc->writeback_count) > 625 CONGESTION_ON_THRESH(fsc->mount_options->congestion_kb)) 626 set_bdi_congested(inode_to_bdi(inode), BLK_RW_ASYNC); 627 628 set_page_writeback(page); 629 err = ceph_osdc_writepages(&fsc->client->osdc, ceph_vino(inode), 630 &ci->i_layout, snapc, page_off, len, 631 ceph_wbc.truncate_seq, 632 ceph_wbc.truncate_size, 633 &inode->i_mtime, &page, 1); 634 if (err < 0) { 635 struct writeback_control tmp_wbc; 636 if (!wbc) 637 wbc = &tmp_wbc; 638 if (err == -ERESTARTSYS) { 639 /* killed by SIGKILL */ 640 dout("writepage interrupted page %p\n", page); 641 redirty_page_for_writepage(wbc, page); 642 end_page_writeback(page); 643 return err; 644 } 645 if (err == -EBLACKLISTED) 646 fsc->blacklisted = true; 647 dout("writepage setting page/mapping error %d %p\n", 648 err, page); 649 mapping_set_error(&inode->i_data, err); 650 wbc->pages_skipped++; 651 } else { 652 dout("writepage cleaned page %p\n", page); 653 err = 0; /* vfs expects us to return 0 */ 654 } 655 page->private = 0; 656 ClearPagePrivate(page); 657 end_page_writeback(page); 658 ceph_put_wrbuffer_cap_refs(ci, 1, snapc); 659 ceph_put_snap_context(snapc); /* page's reference */ 660 661 if (atomic_long_dec_return(&fsc->writeback_count) < 662 CONGESTION_OFF_THRESH(fsc->mount_options->congestion_kb)) 663 clear_bdi_congested(inode_to_bdi(inode), BLK_RW_ASYNC); 664 665 return err; 666 } 667 668 static int ceph_writepage(struct page *page, struct writeback_control *wbc) 669 { 670 int err; 671 struct inode *inode = page->mapping->host; 672 BUG_ON(!inode); 673 ihold(inode); 674 err = writepage_nounlock(page, wbc); 675 if (err == -ERESTARTSYS) { 676 /* direct memory reclaimer was killed by SIGKILL. return 0 677 * to prevent caller from setting mapping/page error */ 678 err = 0; 679 } 680 unlock_page(page); 681 iput(inode); 682 return err; 683 } 684 685 /* 686 * async writeback completion handler. 687 * 688 * If we get an error, set the mapping error bit, but not the individual 689 * page error bits. 690 */ 691 static void writepages_finish(struct ceph_osd_request *req) 692 { 693 struct inode *inode = req->r_inode; 694 struct ceph_inode_info *ci = ceph_inode(inode); 695 struct ceph_osd_data *osd_data; 696 struct page *page; 697 int num_pages, total_pages = 0; 698 int i, j; 699 int rc = req->r_result; 700 struct ceph_snap_context *snapc = req->r_snapc; 701 struct address_space *mapping = inode->i_mapping; 702 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 703 bool remove_page; 704 705 dout("writepages_finish %p rc %d\n", inode, rc); 706 if (rc < 0) { 707 mapping_set_error(mapping, rc); 708 ceph_set_error_write(ci); 709 if (rc == -EBLACKLISTED) 710 fsc->blacklisted = true; 711 } else { 712 ceph_clear_error_write(ci); 713 } 714 715 /* 716 * We lost the cache cap, need to truncate the page before 717 * it is unlocked, otherwise we'd truncate it later in the 718 * page truncation thread, possibly losing some data that 719 * raced its way in 720 */ 721 remove_page = !(ceph_caps_issued(ci) & 722 (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)); 723 724 /* clean all pages */ 725 for (i = 0; i < req->r_num_ops; i++) { 726 if (req->r_ops[i].op != CEPH_OSD_OP_WRITE) 727 break; 728 729 osd_data = osd_req_op_extent_osd_data(req, i); 730 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES); 731 num_pages = calc_pages_for((u64)osd_data->alignment, 732 (u64)osd_data->length); 733 total_pages += num_pages; 734 for (j = 0; j < num_pages; j++) { 735 page = osd_data->pages[j]; 736 BUG_ON(!page); 737 WARN_ON(!PageUptodate(page)); 738 739 if (atomic_long_dec_return(&fsc->writeback_count) < 740 CONGESTION_OFF_THRESH( 741 fsc->mount_options->congestion_kb)) 742 clear_bdi_congested(inode_to_bdi(inode), 743 BLK_RW_ASYNC); 744 745 ceph_put_snap_context(page_snap_context(page)); 746 page->private = 0; 747 ClearPagePrivate(page); 748 dout("unlocking %p\n", page); 749 end_page_writeback(page); 750 751 if (remove_page) 752 generic_error_remove_page(inode->i_mapping, 753 page); 754 755 unlock_page(page); 756 } 757 dout("writepages_finish %p wrote %llu bytes cleaned %d pages\n", 758 inode, osd_data->length, rc >= 0 ? num_pages : 0); 759 760 release_pages(osd_data->pages, num_pages); 761 } 762 763 ceph_put_wrbuffer_cap_refs(ci, total_pages, snapc); 764 765 osd_data = osd_req_op_extent_osd_data(req, 0); 766 if (osd_data->pages_from_pool) 767 mempool_free(osd_data->pages, 768 ceph_sb_to_client(inode->i_sb)->wb_pagevec_pool); 769 else 770 kfree(osd_data->pages); 771 ceph_osdc_put_request(req); 772 } 773 774 /* 775 * initiate async writeback 776 */ 777 static int ceph_writepages_start(struct address_space *mapping, 778 struct writeback_control *wbc) 779 { 780 struct inode *inode = mapping->host; 781 struct ceph_inode_info *ci = ceph_inode(inode); 782 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 783 struct ceph_vino vino = ceph_vino(inode); 784 pgoff_t index, start_index, end = -1; 785 struct ceph_snap_context *snapc = NULL, *last_snapc = NULL, *pgsnapc; 786 struct pagevec pvec; 787 int rc = 0; 788 unsigned int wsize = i_blocksize(inode); 789 struct ceph_osd_request *req = NULL; 790 struct ceph_writeback_ctl ceph_wbc; 791 bool should_loop, range_whole = false; 792 bool done = false; 793 794 dout("writepages_start %p (mode=%s)\n", inode, 795 wbc->sync_mode == WB_SYNC_NONE ? "NONE" : 796 (wbc->sync_mode == WB_SYNC_ALL ? "ALL" : "HOLD")); 797 798 if (READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) { 799 if (ci->i_wrbuffer_ref > 0) { 800 pr_warn_ratelimited( 801 "writepage_start %p %lld forced umount\n", 802 inode, ceph_ino(inode)); 803 } 804 mapping_set_error(mapping, -EIO); 805 return -EIO; /* we're in a forced umount, don't write! */ 806 } 807 if (fsc->mount_options->wsize < wsize) 808 wsize = fsc->mount_options->wsize; 809 810 pagevec_init(&pvec); 811 812 start_index = wbc->range_cyclic ? mapping->writeback_index : 0; 813 index = start_index; 814 815 retry: 816 /* find oldest snap context with dirty data */ 817 snapc = get_oldest_context(inode, &ceph_wbc, NULL); 818 if (!snapc) { 819 /* hmm, why does writepages get called when there 820 is no dirty data? */ 821 dout(" no snap context with dirty data?\n"); 822 goto out; 823 } 824 dout(" oldest snapc is %p seq %lld (%d snaps)\n", 825 snapc, snapc->seq, snapc->num_snaps); 826 827 should_loop = false; 828 if (ceph_wbc.head_snapc && snapc != last_snapc) { 829 /* where to start/end? */ 830 if (wbc->range_cyclic) { 831 index = start_index; 832 end = -1; 833 if (index > 0) 834 should_loop = true; 835 dout(" cyclic, start at %lu\n", index); 836 } else { 837 index = wbc->range_start >> PAGE_SHIFT; 838 end = wbc->range_end >> PAGE_SHIFT; 839 if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) 840 range_whole = true; 841 dout(" not cyclic, %lu to %lu\n", index, end); 842 } 843 } else if (!ceph_wbc.head_snapc) { 844 /* Do not respect wbc->range_{start,end}. Dirty pages 845 * in that range can be associated with newer snapc. 846 * They are not writeable until we write all dirty pages 847 * associated with 'snapc' get written */ 848 if (index > 0) 849 should_loop = true; 850 dout(" non-head snapc, range whole\n"); 851 } 852 853 ceph_put_snap_context(last_snapc); 854 last_snapc = snapc; 855 856 while (!done && index <= end) { 857 int num_ops = 0, op_idx; 858 unsigned i, pvec_pages, max_pages, locked_pages = 0; 859 struct page **pages = NULL, **data_pages; 860 mempool_t *pool = NULL; /* Becomes non-null if mempool used */ 861 struct page *page; 862 pgoff_t strip_unit_end = 0; 863 u64 offset = 0, len = 0; 864 865 max_pages = wsize >> PAGE_SHIFT; 866 867 get_more_pages: 868 pvec_pages = pagevec_lookup_range_nr_tag(&pvec, mapping, &index, 869 end, PAGECACHE_TAG_DIRTY, 870 max_pages - locked_pages); 871 dout("pagevec_lookup_range_tag got %d\n", pvec_pages); 872 if (!pvec_pages && !locked_pages) 873 break; 874 for (i = 0; i < pvec_pages && locked_pages < max_pages; i++) { 875 page = pvec.pages[i]; 876 dout("? %p idx %lu\n", page, page->index); 877 if (locked_pages == 0) 878 lock_page(page); /* first page */ 879 else if (!trylock_page(page)) 880 break; 881 882 /* only dirty pages, or our accounting breaks */ 883 if (unlikely(!PageDirty(page)) || 884 unlikely(page->mapping != mapping)) { 885 dout("!dirty or !mapping %p\n", page); 886 unlock_page(page); 887 continue; 888 } 889 /* only if matching snap context */ 890 pgsnapc = page_snap_context(page); 891 if (pgsnapc != snapc) { 892 dout("page snapc %p %lld != oldest %p %lld\n", 893 pgsnapc, pgsnapc->seq, snapc, snapc->seq); 894 if (!should_loop && 895 !ceph_wbc.head_snapc && 896 wbc->sync_mode != WB_SYNC_NONE) 897 should_loop = true; 898 unlock_page(page); 899 continue; 900 } 901 if (page_offset(page) >= ceph_wbc.i_size) { 902 dout("%p page eof %llu\n", 903 page, ceph_wbc.i_size); 904 if ((ceph_wbc.size_stable || 905 page_offset(page) >= i_size_read(inode)) && 906 clear_page_dirty_for_io(page)) 907 mapping->a_ops->invalidatepage(page, 908 0, PAGE_SIZE); 909 unlock_page(page); 910 continue; 911 } 912 if (strip_unit_end && (page->index > strip_unit_end)) { 913 dout("end of strip unit %p\n", page); 914 unlock_page(page); 915 break; 916 } 917 if (PageWriteback(page)) { 918 if (wbc->sync_mode == WB_SYNC_NONE) { 919 dout("%p under writeback\n", page); 920 unlock_page(page); 921 continue; 922 } 923 dout("waiting on writeback %p\n", page); 924 wait_on_page_writeback(page); 925 } 926 927 if (!clear_page_dirty_for_io(page)) { 928 dout("%p !clear_page_dirty_for_io\n", page); 929 unlock_page(page); 930 continue; 931 } 932 933 /* 934 * We have something to write. If this is 935 * the first locked page this time through, 936 * calculate max possinle write size and 937 * allocate a page array 938 */ 939 if (locked_pages == 0) { 940 u64 objnum; 941 u64 objoff; 942 u32 xlen; 943 944 /* prepare async write request */ 945 offset = (u64)page_offset(page); 946 ceph_calc_file_object_mapping(&ci->i_layout, 947 offset, wsize, 948 &objnum, &objoff, 949 &xlen); 950 len = xlen; 951 952 num_ops = 1; 953 strip_unit_end = page->index + 954 ((len - 1) >> PAGE_SHIFT); 955 956 BUG_ON(pages); 957 max_pages = calc_pages_for(0, (u64)len); 958 pages = kmalloc_array(max_pages, 959 sizeof(*pages), 960 GFP_NOFS); 961 if (!pages) { 962 pool = fsc->wb_pagevec_pool; 963 pages = mempool_alloc(pool, GFP_NOFS); 964 BUG_ON(!pages); 965 } 966 967 len = 0; 968 } else if (page->index != 969 (offset + len) >> PAGE_SHIFT) { 970 if (num_ops >= (pool ? CEPH_OSD_SLAB_OPS : 971 CEPH_OSD_MAX_OPS)) { 972 redirty_page_for_writepage(wbc, page); 973 unlock_page(page); 974 break; 975 } 976 977 num_ops++; 978 offset = (u64)page_offset(page); 979 len = 0; 980 } 981 982 /* note position of first page in pvec */ 983 dout("%p will write page %p idx %lu\n", 984 inode, page, page->index); 985 986 if (atomic_long_inc_return(&fsc->writeback_count) > 987 CONGESTION_ON_THRESH( 988 fsc->mount_options->congestion_kb)) { 989 set_bdi_congested(inode_to_bdi(inode), 990 BLK_RW_ASYNC); 991 } 992 993 994 pages[locked_pages++] = page; 995 pvec.pages[i] = NULL; 996 997 len += PAGE_SIZE; 998 } 999 1000 /* did we get anything? */ 1001 if (!locked_pages) 1002 goto release_pvec_pages; 1003 if (i) { 1004 unsigned j, n = 0; 1005 /* shift unused page to beginning of pvec */ 1006 for (j = 0; j < pvec_pages; j++) { 1007 if (!pvec.pages[j]) 1008 continue; 1009 if (n < j) 1010 pvec.pages[n] = pvec.pages[j]; 1011 n++; 1012 } 1013 pvec.nr = n; 1014 1015 if (pvec_pages && i == pvec_pages && 1016 locked_pages < max_pages) { 1017 dout("reached end pvec, trying for more\n"); 1018 pagevec_release(&pvec); 1019 goto get_more_pages; 1020 } 1021 } 1022 1023 new_request: 1024 offset = page_offset(pages[0]); 1025 len = wsize; 1026 1027 req = ceph_osdc_new_request(&fsc->client->osdc, 1028 &ci->i_layout, vino, 1029 offset, &len, 0, num_ops, 1030 CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE, 1031 snapc, ceph_wbc.truncate_seq, 1032 ceph_wbc.truncate_size, false); 1033 if (IS_ERR(req)) { 1034 req = ceph_osdc_new_request(&fsc->client->osdc, 1035 &ci->i_layout, vino, 1036 offset, &len, 0, 1037 min(num_ops, 1038 CEPH_OSD_SLAB_OPS), 1039 CEPH_OSD_OP_WRITE, 1040 CEPH_OSD_FLAG_WRITE, 1041 snapc, ceph_wbc.truncate_seq, 1042 ceph_wbc.truncate_size, true); 1043 BUG_ON(IS_ERR(req)); 1044 } 1045 BUG_ON(len < page_offset(pages[locked_pages - 1]) + 1046 PAGE_SIZE - offset); 1047 1048 req->r_callback = writepages_finish; 1049 req->r_inode = inode; 1050 1051 /* Format the osd request message and submit the write */ 1052 len = 0; 1053 data_pages = pages; 1054 op_idx = 0; 1055 for (i = 0; i < locked_pages; i++) { 1056 u64 cur_offset = page_offset(pages[i]); 1057 if (offset + len != cur_offset) { 1058 if (op_idx + 1 == req->r_num_ops) 1059 break; 1060 osd_req_op_extent_dup_last(req, op_idx, 1061 cur_offset - offset); 1062 dout("writepages got pages at %llu~%llu\n", 1063 offset, len); 1064 osd_req_op_extent_osd_data_pages(req, op_idx, 1065 data_pages, len, 0, 1066 !!pool, false); 1067 osd_req_op_extent_update(req, op_idx, len); 1068 1069 len = 0; 1070 offset = cur_offset; 1071 data_pages = pages + i; 1072 op_idx++; 1073 } 1074 1075 set_page_writeback(pages[i]); 1076 len += PAGE_SIZE; 1077 } 1078 1079 if (ceph_wbc.size_stable) { 1080 len = min(len, ceph_wbc.i_size - offset); 1081 } else if (i == locked_pages) { 1082 /* writepages_finish() clears writeback pages 1083 * according to the data length, so make sure 1084 * data length covers all locked pages */ 1085 u64 min_len = len + 1 - PAGE_SIZE; 1086 len = get_writepages_data_length(inode, pages[i - 1], 1087 offset); 1088 len = max(len, min_len); 1089 } 1090 dout("writepages got pages at %llu~%llu\n", offset, len); 1091 1092 osd_req_op_extent_osd_data_pages(req, op_idx, data_pages, len, 1093 0, !!pool, false); 1094 osd_req_op_extent_update(req, op_idx, len); 1095 1096 BUG_ON(op_idx + 1 != req->r_num_ops); 1097 1098 pool = NULL; 1099 if (i < locked_pages) { 1100 BUG_ON(num_ops <= req->r_num_ops); 1101 num_ops -= req->r_num_ops; 1102 locked_pages -= i; 1103 1104 /* allocate new pages array for next request */ 1105 data_pages = pages; 1106 pages = kmalloc_array(locked_pages, sizeof(*pages), 1107 GFP_NOFS); 1108 if (!pages) { 1109 pool = fsc->wb_pagevec_pool; 1110 pages = mempool_alloc(pool, GFP_NOFS); 1111 BUG_ON(!pages); 1112 } 1113 memcpy(pages, data_pages + i, 1114 locked_pages * sizeof(*pages)); 1115 memset(data_pages + i, 0, 1116 locked_pages * sizeof(*pages)); 1117 } else { 1118 BUG_ON(num_ops != req->r_num_ops); 1119 index = pages[i - 1]->index + 1; 1120 /* request message now owns the pages array */ 1121 pages = NULL; 1122 } 1123 1124 req->r_mtime = inode->i_mtime; 1125 rc = ceph_osdc_start_request(&fsc->client->osdc, req, true); 1126 BUG_ON(rc); 1127 req = NULL; 1128 1129 wbc->nr_to_write -= i; 1130 if (pages) 1131 goto new_request; 1132 1133 /* 1134 * We stop writing back only if we are not doing 1135 * integrity sync. In case of integrity sync we have to 1136 * keep going until we have written all the pages 1137 * we tagged for writeback prior to entering this loop. 1138 */ 1139 if (wbc->nr_to_write <= 0 && wbc->sync_mode == WB_SYNC_NONE) 1140 done = true; 1141 1142 release_pvec_pages: 1143 dout("pagevec_release on %d pages (%p)\n", (int)pvec.nr, 1144 pvec.nr ? pvec.pages[0] : NULL); 1145 pagevec_release(&pvec); 1146 } 1147 1148 if (should_loop && !done) { 1149 /* more to do; loop back to beginning of file */ 1150 dout("writepages looping back to beginning of file\n"); 1151 end = start_index - 1; /* OK even when start_index == 0 */ 1152 1153 /* to write dirty pages associated with next snapc, 1154 * we need to wait until current writes complete */ 1155 if (wbc->sync_mode != WB_SYNC_NONE && 1156 start_index == 0 && /* all dirty pages were checked */ 1157 !ceph_wbc.head_snapc) { 1158 struct page *page; 1159 unsigned i, nr; 1160 index = 0; 1161 while ((index <= end) && 1162 (nr = pagevec_lookup_tag(&pvec, mapping, &index, 1163 PAGECACHE_TAG_WRITEBACK))) { 1164 for (i = 0; i < nr; i++) { 1165 page = pvec.pages[i]; 1166 if (page_snap_context(page) != snapc) 1167 continue; 1168 wait_on_page_writeback(page); 1169 } 1170 pagevec_release(&pvec); 1171 cond_resched(); 1172 } 1173 } 1174 1175 start_index = 0; 1176 index = 0; 1177 goto retry; 1178 } 1179 1180 if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) 1181 mapping->writeback_index = index; 1182 1183 out: 1184 ceph_osdc_put_request(req); 1185 ceph_put_snap_context(last_snapc); 1186 dout("writepages dend - startone, rc = %d\n", rc); 1187 return rc; 1188 } 1189 1190 1191 1192 /* 1193 * See if a given @snapc is either writeable, or already written. 1194 */ 1195 static int context_is_writeable_or_written(struct inode *inode, 1196 struct ceph_snap_context *snapc) 1197 { 1198 struct ceph_snap_context *oldest = get_oldest_context(inode, NULL, NULL); 1199 int ret = !oldest || snapc->seq <= oldest->seq; 1200 1201 ceph_put_snap_context(oldest); 1202 return ret; 1203 } 1204 1205 /* 1206 * We are only allowed to write into/dirty the page if the page is 1207 * clean, or already dirty within the same snap context. 1208 * 1209 * called with page locked. 1210 * return success with page locked, 1211 * or any failure (incl -EAGAIN) with page unlocked. 1212 */ 1213 static int ceph_update_writeable_page(struct file *file, 1214 loff_t pos, unsigned len, 1215 struct page *page) 1216 { 1217 struct inode *inode = file_inode(file); 1218 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 1219 struct ceph_inode_info *ci = ceph_inode(inode); 1220 loff_t page_off = pos & PAGE_MASK; 1221 int pos_in_page = pos & ~PAGE_MASK; 1222 int end_in_page = pos_in_page + len; 1223 loff_t i_size; 1224 int r; 1225 struct ceph_snap_context *snapc, *oldest; 1226 1227 if (READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) { 1228 dout(" page %p forced umount\n", page); 1229 unlock_page(page); 1230 return -EIO; 1231 } 1232 1233 retry_locked: 1234 /* writepages currently holds page lock, but if we change that later, */ 1235 wait_on_page_writeback(page); 1236 1237 snapc = page_snap_context(page); 1238 if (snapc && snapc != ci->i_head_snapc) { 1239 /* 1240 * this page is already dirty in another (older) snap 1241 * context! is it writeable now? 1242 */ 1243 oldest = get_oldest_context(inode, NULL, NULL); 1244 if (snapc->seq > oldest->seq) { 1245 ceph_put_snap_context(oldest); 1246 dout(" page %p snapc %p not current or oldest\n", 1247 page, snapc); 1248 /* 1249 * queue for writeback, and wait for snapc to 1250 * be writeable or written 1251 */ 1252 snapc = ceph_get_snap_context(snapc); 1253 unlock_page(page); 1254 ceph_queue_writeback(inode); 1255 r = wait_event_killable(ci->i_cap_wq, 1256 context_is_writeable_or_written(inode, snapc)); 1257 ceph_put_snap_context(snapc); 1258 if (r == -ERESTARTSYS) 1259 return r; 1260 return -EAGAIN; 1261 } 1262 ceph_put_snap_context(oldest); 1263 1264 /* yay, writeable, do it now (without dropping page lock) */ 1265 dout(" page %p snapc %p not current, but oldest\n", 1266 page, snapc); 1267 if (!clear_page_dirty_for_io(page)) 1268 goto retry_locked; 1269 r = writepage_nounlock(page, NULL); 1270 if (r < 0) 1271 goto fail_unlock; 1272 goto retry_locked; 1273 } 1274 1275 if (PageUptodate(page)) { 1276 dout(" page %p already uptodate\n", page); 1277 return 0; 1278 } 1279 1280 /* full page? */ 1281 if (pos_in_page == 0 && len == PAGE_SIZE) 1282 return 0; 1283 1284 /* past end of file? */ 1285 i_size = i_size_read(inode); 1286 1287 if (page_off >= i_size || 1288 (pos_in_page == 0 && (pos+len) >= i_size && 1289 end_in_page - pos_in_page != PAGE_SIZE)) { 1290 dout(" zeroing %p 0 - %d and %d - %d\n", 1291 page, pos_in_page, end_in_page, (int)PAGE_SIZE); 1292 zero_user_segments(page, 1293 0, pos_in_page, 1294 end_in_page, PAGE_SIZE); 1295 return 0; 1296 } 1297 1298 /* we need to read it. */ 1299 r = ceph_do_readpage(file, page); 1300 if (r < 0) { 1301 if (r == -EINPROGRESS) 1302 return -EAGAIN; 1303 goto fail_unlock; 1304 } 1305 goto retry_locked; 1306 fail_unlock: 1307 unlock_page(page); 1308 return r; 1309 } 1310 1311 /* 1312 * We are only allowed to write into/dirty the page if the page is 1313 * clean, or already dirty within the same snap context. 1314 */ 1315 static int ceph_write_begin(struct file *file, struct address_space *mapping, 1316 loff_t pos, unsigned len, unsigned flags, 1317 struct page **pagep, void **fsdata) 1318 { 1319 struct inode *inode = file_inode(file); 1320 struct page *page; 1321 pgoff_t index = pos >> PAGE_SHIFT; 1322 int r; 1323 1324 do { 1325 /* get a page */ 1326 page = grab_cache_page_write_begin(mapping, index, 0); 1327 if (!page) 1328 return -ENOMEM; 1329 1330 dout("write_begin file %p inode %p page %p %d~%d\n", file, 1331 inode, page, (int)pos, (int)len); 1332 1333 r = ceph_update_writeable_page(file, pos, len, page); 1334 if (r < 0) 1335 put_page(page); 1336 else 1337 *pagep = page; 1338 } while (r == -EAGAIN); 1339 1340 return r; 1341 } 1342 1343 /* 1344 * we don't do anything in here that simple_write_end doesn't do 1345 * except adjust dirty page accounting 1346 */ 1347 static int ceph_write_end(struct file *file, struct address_space *mapping, 1348 loff_t pos, unsigned len, unsigned copied, 1349 struct page *page, void *fsdata) 1350 { 1351 struct inode *inode = file_inode(file); 1352 bool check_cap = false; 1353 1354 dout("write_end file %p inode %p page %p %d~%d (%d)\n", file, 1355 inode, page, (int)pos, (int)copied, (int)len); 1356 1357 /* zero the stale part of the page if we did a short copy */ 1358 if (!PageUptodate(page)) { 1359 if (copied < len) { 1360 copied = 0; 1361 goto out; 1362 } 1363 SetPageUptodate(page); 1364 } 1365 1366 /* did file size increase? */ 1367 if (pos+copied > i_size_read(inode)) 1368 check_cap = ceph_inode_set_size(inode, pos+copied); 1369 1370 set_page_dirty(page); 1371 1372 out: 1373 unlock_page(page); 1374 put_page(page); 1375 1376 if (check_cap) 1377 ceph_check_caps(ceph_inode(inode), CHECK_CAPS_AUTHONLY, NULL); 1378 1379 return copied; 1380 } 1381 1382 /* 1383 * we set .direct_IO to indicate direct io is supported, but since we 1384 * intercept O_DIRECT reads and writes early, this function should 1385 * never get called. 1386 */ 1387 static ssize_t ceph_direct_io(struct kiocb *iocb, struct iov_iter *iter) 1388 { 1389 WARN_ON(1); 1390 return -EINVAL; 1391 } 1392 1393 const struct address_space_operations ceph_aops = { 1394 .readpage = ceph_readpage, 1395 .readpages = ceph_readpages, 1396 .writepage = ceph_writepage, 1397 .writepages = ceph_writepages_start, 1398 .write_begin = ceph_write_begin, 1399 .write_end = ceph_write_end, 1400 .set_page_dirty = ceph_set_page_dirty, 1401 .invalidatepage = ceph_invalidatepage, 1402 .releasepage = ceph_releasepage, 1403 .direct_IO = ceph_direct_io, 1404 }; 1405 1406 static void ceph_block_sigs(sigset_t *oldset) 1407 { 1408 sigset_t mask; 1409 siginitsetinv(&mask, sigmask(SIGKILL)); 1410 sigprocmask(SIG_BLOCK, &mask, oldset); 1411 } 1412 1413 static void ceph_restore_sigs(sigset_t *oldset) 1414 { 1415 sigprocmask(SIG_SETMASK, oldset, NULL); 1416 } 1417 1418 /* 1419 * vm ops 1420 */ 1421 static vm_fault_t ceph_filemap_fault(struct vm_fault *vmf) 1422 { 1423 struct vm_area_struct *vma = vmf->vma; 1424 struct inode *inode = file_inode(vma->vm_file); 1425 struct ceph_inode_info *ci = ceph_inode(inode); 1426 struct ceph_file_info *fi = vma->vm_file->private_data; 1427 struct page *pinned_page = NULL; 1428 loff_t off = vmf->pgoff << PAGE_SHIFT; 1429 int want, got, err; 1430 sigset_t oldset; 1431 vm_fault_t ret = VM_FAULT_SIGBUS; 1432 1433 ceph_block_sigs(&oldset); 1434 1435 dout("filemap_fault %p %llx.%llx %llu~%zd trying to get caps\n", 1436 inode, ceph_vinop(inode), off, (size_t)PAGE_SIZE); 1437 if (fi->fmode & CEPH_FILE_MODE_LAZY) 1438 want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO; 1439 else 1440 want = CEPH_CAP_FILE_CACHE; 1441 1442 got = 0; 1443 err = ceph_get_caps(vma->vm_file, CEPH_CAP_FILE_RD, want, -1, 1444 &got, &pinned_page); 1445 if (err < 0) 1446 goto out_restore; 1447 1448 dout("filemap_fault %p %llu~%zd got cap refs on %s\n", 1449 inode, off, (size_t)PAGE_SIZE, ceph_cap_string(got)); 1450 1451 if ((got & (CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO)) || 1452 ci->i_inline_version == CEPH_INLINE_NONE) { 1453 CEPH_DEFINE_RW_CONTEXT(rw_ctx, got); 1454 ceph_add_rw_context(fi, &rw_ctx); 1455 ret = filemap_fault(vmf); 1456 ceph_del_rw_context(fi, &rw_ctx); 1457 dout("filemap_fault %p %llu~%zd drop cap refs %s ret %x\n", 1458 inode, off, (size_t)PAGE_SIZE, 1459 ceph_cap_string(got), ret); 1460 } else 1461 err = -EAGAIN; 1462 1463 if (pinned_page) 1464 put_page(pinned_page); 1465 ceph_put_cap_refs(ci, got); 1466 1467 if (err != -EAGAIN) 1468 goto out_restore; 1469 1470 /* read inline data */ 1471 if (off >= PAGE_SIZE) { 1472 /* does not support inline data > PAGE_SIZE */ 1473 ret = VM_FAULT_SIGBUS; 1474 } else { 1475 struct address_space *mapping = inode->i_mapping; 1476 struct page *page = find_or_create_page(mapping, 0, 1477 mapping_gfp_constraint(mapping, 1478 ~__GFP_FS)); 1479 if (!page) { 1480 ret = VM_FAULT_OOM; 1481 goto out_inline; 1482 } 1483 err = __ceph_do_getattr(inode, page, 1484 CEPH_STAT_CAP_INLINE_DATA, true); 1485 if (err < 0 || off >= i_size_read(inode)) { 1486 unlock_page(page); 1487 put_page(page); 1488 ret = vmf_error(err); 1489 goto out_inline; 1490 } 1491 if (err < PAGE_SIZE) 1492 zero_user_segment(page, err, PAGE_SIZE); 1493 else 1494 flush_dcache_page(page); 1495 SetPageUptodate(page); 1496 vmf->page = page; 1497 ret = VM_FAULT_MAJOR | VM_FAULT_LOCKED; 1498 out_inline: 1499 dout("filemap_fault %p %llu~%zd read inline data ret %x\n", 1500 inode, off, (size_t)PAGE_SIZE, ret); 1501 } 1502 out_restore: 1503 ceph_restore_sigs(&oldset); 1504 if (err < 0) 1505 ret = vmf_error(err); 1506 1507 return ret; 1508 } 1509 1510 /* 1511 * Reuse write_begin here for simplicity. 1512 */ 1513 static vm_fault_t ceph_page_mkwrite(struct vm_fault *vmf) 1514 { 1515 struct vm_area_struct *vma = vmf->vma; 1516 struct inode *inode = file_inode(vma->vm_file); 1517 struct ceph_inode_info *ci = ceph_inode(inode); 1518 struct ceph_file_info *fi = vma->vm_file->private_data; 1519 struct ceph_cap_flush *prealloc_cf; 1520 struct page *page = vmf->page; 1521 loff_t off = page_offset(page); 1522 loff_t size = i_size_read(inode); 1523 size_t len; 1524 int want, got, err; 1525 sigset_t oldset; 1526 vm_fault_t ret = VM_FAULT_SIGBUS; 1527 1528 prealloc_cf = ceph_alloc_cap_flush(); 1529 if (!prealloc_cf) 1530 return VM_FAULT_OOM; 1531 1532 sb_start_pagefault(inode->i_sb); 1533 ceph_block_sigs(&oldset); 1534 1535 if (ci->i_inline_version != CEPH_INLINE_NONE) { 1536 struct page *locked_page = NULL; 1537 if (off == 0) { 1538 lock_page(page); 1539 locked_page = page; 1540 } 1541 err = ceph_uninline_data(vma->vm_file, locked_page); 1542 if (locked_page) 1543 unlock_page(locked_page); 1544 if (err < 0) 1545 goto out_free; 1546 } 1547 1548 if (off + PAGE_SIZE <= size) 1549 len = PAGE_SIZE; 1550 else 1551 len = size & ~PAGE_MASK; 1552 1553 dout("page_mkwrite %p %llx.%llx %llu~%zd getting caps i_size %llu\n", 1554 inode, ceph_vinop(inode), off, len, size); 1555 if (fi->fmode & CEPH_FILE_MODE_LAZY) 1556 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO; 1557 else 1558 want = CEPH_CAP_FILE_BUFFER; 1559 1560 got = 0; 1561 err = ceph_get_caps(vma->vm_file, CEPH_CAP_FILE_WR, want, off + len, 1562 &got, NULL); 1563 if (err < 0) 1564 goto out_free; 1565 1566 dout("page_mkwrite %p %llu~%zd got cap refs on %s\n", 1567 inode, off, len, ceph_cap_string(got)); 1568 1569 /* Update time before taking page lock */ 1570 file_update_time(vma->vm_file); 1571 inode_inc_iversion_raw(inode); 1572 1573 do { 1574 lock_page(page); 1575 1576 if ((off > size) || (page->mapping != inode->i_mapping)) { 1577 unlock_page(page); 1578 ret = VM_FAULT_NOPAGE; 1579 break; 1580 } 1581 1582 err = ceph_update_writeable_page(vma->vm_file, off, len, page); 1583 if (err >= 0) { 1584 /* success. we'll keep the page locked. */ 1585 set_page_dirty(page); 1586 ret = VM_FAULT_LOCKED; 1587 } 1588 } while (err == -EAGAIN); 1589 1590 if (ret == VM_FAULT_LOCKED || 1591 ci->i_inline_version != CEPH_INLINE_NONE) { 1592 int dirty; 1593 spin_lock(&ci->i_ceph_lock); 1594 ci->i_inline_version = CEPH_INLINE_NONE; 1595 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR, 1596 &prealloc_cf); 1597 spin_unlock(&ci->i_ceph_lock); 1598 if (dirty) 1599 __mark_inode_dirty(inode, dirty); 1600 } 1601 1602 dout("page_mkwrite %p %llu~%zd dropping cap refs on %s ret %x\n", 1603 inode, off, len, ceph_cap_string(got), ret); 1604 ceph_put_cap_refs(ci, got); 1605 out_free: 1606 ceph_restore_sigs(&oldset); 1607 sb_end_pagefault(inode->i_sb); 1608 ceph_free_cap_flush(prealloc_cf); 1609 if (err < 0) 1610 ret = vmf_error(err); 1611 return ret; 1612 } 1613 1614 void ceph_fill_inline_data(struct inode *inode, struct page *locked_page, 1615 char *data, size_t len) 1616 { 1617 struct address_space *mapping = inode->i_mapping; 1618 struct page *page; 1619 1620 if (locked_page) { 1621 page = locked_page; 1622 } else { 1623 if (i_size_read(inode) == 0) 1624 return; 1625 page = find_or_create_page(mapping, 0, 1626 mapping_gfp_constraint(mapping, 1627 ~__GFP_FS)); 1628 if (!page) 1629 return; 1630 if (PageUptodate(page)) { 1631 unlock_page(page); 1632 put_page(page); 1633 return; 1634 } 1635 } 1636 1637 dout("fill_inline_data %p %llx.%llx len %zu locked_page %p\n", 1638 inode, ceph_vinop(inode), len, locked_page); 1639 1640 if (len > 0) { 1641 void *kaddr = kmap_atomic(page); 1642 memcpy(kaddr, data, len); 1643 kunmap_atomic(kaddr); 1644 } 1645 1646 if (page != locked_page) { 1647 if (len < PAGE_SIZE) 1648 zero_user_segment(page, len, PAGE_SIZE); 1649 else 1650 flush_dcache_page(page); 1651 1652 SetPageUptodate(page); 1653 unlock_page(page); 1654 put_page(page); 1655 } 1656 } 1657 1658 int ceph_uninline_data(struct file *filp, struct page *locked_page) 1659 { 1660 struct inode *inode = file_inode(filp); 1661 struct ceph_inode_info *ci = ceph_inode(inode); 1662 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 1663 struct ceph_osd_request *req; 1664 struct page *page = NULL; 1665 u64 len, inline_version; 1666 int err = 0; 1667 bool from_pagecache = false; 1668 1669 spin_lock(&ci->i_ceph_lock); 1670 inline_version = ci->i_inline_version; 1671 spin_unlock(&ci->i_ceph_lock); 1672 1673 dout("uninline_data %p %llx.%llx inline_version %llu\n", 1674 inode, ceph_vinop(inode), inline_version); 1675 1676 if (inline_version == 1 || /* initial version, no data */ 1677 inline_version == CEPH_INLINE_NONE) 1678 goto out; 1679 1680 if (locked_page) { 1681 page = locked_page; 1682 WARN_ON(!PageUptodate(page)); 1683 } else if (ceph_caps_issued(ci) & 1684 (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) { 1685 page = find_get_page(inode->i_mapping, 0); 1686 if (page) { 1687 if (PageUptodate(page)) { 1688 from_pagecache = true; 1689 lock_page(page); 1690 } else { 1691 put_page(page); 1692 page = NULL; 1693 } 1694 } 1695 } 1696 1697 if (page) { 1698 len = i_size_read(inode); 1699 if (len > PAGE_SIZE) 1700 len = PAGE_SIZE; 1701 } else { 1702 page = __page_cache_alloc(GFP_NOFS); 1703 if (!page) { 1704 err = -ENOMEM; 1705 goto out; 1706 } 1707 err = __ceph_do_getattr(inode, page, 1708 CEPH_STAT_CAP_INLINE_DATA, true); 1709 if (err < 0) { 1710 /* no inline data */ 1711 if (err == -ENODATA) 1712 err = 0; 1713 goto out; 1714 } 1715 len = err; 1716 } 1717 1718 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, 1719 ceph_vino(inode), 0, &len, 0, 1, 1720 CEPH_OSD_OP_CREATE, CEPH_OSD_FLAG_WRITE, 1721 NULL, 0, 0, false); 1722 if (IS_ERR(req)) { 1723 err = PTR_ERR(req); 1724 goto out; 1725 } 1726 1727 req->r_mtime = inode->i_mtime; 1728 err = ceph_osdc_start_request(&fsc->client->osdc, req, false); 1729 if (!err) 1730 err = ceph_osdc_wait_request(&fsc->client->osdc, req); 1731 ceph_osdc_put_request(req); 1732 if (err < 0) 1733 goto out; 1734 1735 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, 1736 ceph_vino(inode), 0, &len, 1, 3, 1737 CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE, 1738 NULL, ci->i_truncate_seq, 1739 ci->i_truncate_size, false); 1740 if (IS_ERR(req)) { 1741 err = PTR_ERR(req); 1742 goto out; 1743 } 1744 1745 osd_req_op_extent_osd_data_pages(req, 1, &page, len, 0, false, false); 1746 1747 { 1748 __le64 xattr_buf = cpu_to_le64(inline_version); 1749 err = osd_req_op_xattr_init(req, 0, CEPH_OSD_OP_CMPXATTR, 1750 "inline_version", &xattr_buf, 1751 sizeof(xattr_buf), 1752 CEPH_OSD_CMPXATTR_OP_GT, 1753 CEPH_OSD_CMPXATTR_MODE_U64); 1754 if (err) 1755 goto out_put; 1756 } 1757 1758 { 1759 char xattr_buf[32]; 1760 int xattr_len = snprintf(xattr_buf, sizeof(xattr_buf), 1761 "%llu", inline_version); 1762 err = osd_req_op_xattr_init(req, 2, CEPH_OSD_OP_SETXATTR, 1763 "inline_version", 1764 xattr_buf, xattr_len, 0, 0); 1765 if (err) 1766 goto out_put; 1767 } 1768 1769 req->r_mtime = inode->i_mtime; 1770 err = ceph_osdc_start_request(&fsc->client->osdc, req, false); 1771 if (!err) 1772 err = ceph_osdc_wait_request(&fsc->client->osdc, req); 1773 out_put: 1774 ceph_osdc_put_request(req); 1775 if (err == -ECANCELED) 1776 err = 0; 1777 out: 1778 if (page && page != locked_page) { 1779 if (from_pagecache) { 1780 unlock_page(page); 1781 put_page(page); 1782 } else 1783 __free_pages(page, 0); 1784 } 1785 1786 dout("uninline_data %p %llx.%llx inline_version %llu = %d\n", 1787 inode, ceph_vinop(inode), inline_version, err); 1788 return err; 1789 } 1790 1791 static const struct vm_operations_struct ceph_vmops = { 1792 .fault = ceph_filemap_fault, 1793 .page_mkwrite = ceph_page_mkwrite, 1794 }; 1795 1796 int ceph_mmap(struct file *file, struct vm_area_struct *vma) 1797 { 1798 struct address_space *mapping = file->f_mapping; 1799 1800 if (!mapping->a_ops->readpage) 1801 return -ENOEXEC; 1802 file_accessed(file); 1803 vma->vm_ops = &ceph_vmops; 1804 return 0; 1805 } 1806 1807 enum { 1808 POOL_READ = 1, 1809 POOL_WRITE = 2, 1810 }; 1811 1812 static int __ceph_pool_perm_get(struct ceph_inode_info *ci, 1813 s64 pool, struct ceph_string *pool_ns) 1814 { 1815 struct ceph_fs_client *fsc = ceph_inode_to_client(&ci->vfs_inode); 1816 struct ceph_mds_client *mdsc = fsc->mdsc; 1817 struct ceph_osd_request *rd_req = NULL, *wr_req = NULL; 1818 struct rb_node **p, *parent; 1819 struct ceph_pool_perm *perm; 1820 struct page **pages; 1821 size_t pool_ns_len; 1822 int err = 0, err2 = 0, have = 0; 1823 1824 down_read(&mdsc->pool_perm_rwsem); 1825 p = &mdsc->pool_perm_tree.rb_node; 1826 while (*p) { 1827 perm = rb_entry(*p, struct ceph_pool_perm, node); 1828 if (pool < perm->pool) 1829 p = &(*p)->rb_left; 1830 else if (pool > perm->pool) 1831 p = &(*p)->rb_right; 1832 else { 1833 int ret = ceph_compare_string(pool_ns, 1834 perm->pool_ns, 1835 perm->pool_ns_len); 1836 if (ret < 0) 1837 p = &(*p)->rb_left; 1838 else if (ret > 0) 1839 p = &(*p)->rb_right; 1840 else { 1841 have = perm->perm; 1842 break; 1843 } 1844 } 1845 } 1846 up_read(&mdsc->pool_perm_rwsem); 1847 if (*p) 1848 goto out; 1849 1850 if (pool_ns) 1851 dout("__ceph_pool_perm_get pool %lld ns %.*s no perm cached\n", 1852 pool, (int)pool_ns->len, pool_ns->str); 1853 else 1854 dout("__ceph_pool_perm_get pool %lld no perm cached\n", pool); 1855 1856 down_write(&mdsc->pool_perm_rwsem); 1857 p = &mdsc->pool_perm_tree.rb_node; 1858 parent = NULL; 1859 while (*p) { 1860 parent = *p; 1861 perm = rb_entry(parent, struct ceph_pool_perm, node); 1862 if (pool < perm->pool) 1863 p = &(*p)->rb_left; 1864 else if (pool > perm->pool) 1865 p = &(*p)->rb_right; 1866 else { 1867 int ret = ceph_compare_string(pool_ns, 1868 perm->pool_ns, 1869 perm->pool_ns_len); 1870 if (ret < 0) 1871 p = &(*p)->rb_left; 1872 else if (ret > 0) 1873 p = &(*p)->rb_right; 1874 else { 1875 have = perm->perm; 1876 break; 1877 } 1878 } 1879 } 1880 if (*p) { 1881 up_write(&mdsc->pool_perm_rwsem); 1882 goto out; 1883 } 1884 1885 rd_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL, 1886 1, false, GFP_NOFS); 1887 if (!rd_req) { 1888 err = -ENOMEM; 1889 goto out_unlock; 1890 } 1891 1892 rd_req->r_flags = CEPH_OSD_FLAG_READ; 1893 osd_req_op_init(rd_req, 0, CEPH_OSD_OP_STAT, 0); 1894 rd_req->r_base_oloc.pool = pool; 1895 if (pool_ns) 1896 rd_req->r_base_oloc.pool_ns = ceph_get_string(pool_ns); 1897 ceph_oid_printf(&rd_req->r_base_oid, "%llx.00000000", ci->i_vino.ino); 1898 1899 err = ceph_osdc_alloc_messages(rd_req, GFP_NOFS); 1900 if (err) 1901 goto out_unlock; 1902 1903 wr_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL, 1904 1, false, GFP_NOFS); 1905 if (!wr_req) { 1906 err = -ENOMEM; 1907 goto out_unlock; 1908 } 1909 1910 wr_req->r_flags = CEPH_OSD_FLAG_WRITE; 1911 osd_req_op_init(wr_req, 0, CEPH_OSD_OP_CREATE, CEPH_OSD_OP_FLAG_EXCL); 1912 ceph_oloc_copy(&wr_req->r_base_oloc, &rd_req->r_base_oloc); 1913 ceph_oid_copy(&wr_req->r_base_oid, &rd_req->r_base_oid); 1914 1915 err = ceph_osdc_alloc_messages(wr_req, GFP_NOFS); 1916 if (err) 1917 goto out_unlock; 1918 1919 /* one page should be large enough for STAT data */ 1920 pages = ceph_alloc_page_vector(1, GFP_KERNEL); 1921 if (IS_ERR(pages)) { 1922 err = PTR_ERR(pages); 1923 goto out_unlock; 1924 } 1925 1926 osd_req_op_raw_data_in_pages(rd_req, 0, pages, PAGE_SIZE, 1927 0, false, true); 1928 err = ceph_osdc_start_request(&fsc->client->osdc, rd_req, false); 1929 1930 wr_req->r_mtime = ci->vfs_inode.i_mtime; 1931 err2 = ceph_osdc_start_request(&fsc->client->osdc, wr_req, false); 1932 1933 if (!err) 1934 err = ceph_osdc_wait_request(&fsc->client->osdc, rd_req); 1935 if (!err2) 1936 err2 = ceph_osdc_wait_request(&fsc->client->osdc, wr_req); 1937 1938 if (err >= 0 || err == -ENOENT) 1939 have |= POOL_READ; 1940 else if (err != -EPERM) { 1941 if (err == -EBLACKLISTED) 1942 fsc->blacklisted = true; 1943 goto out_unlock; 1944 } 1945 1946 if (err2 == 0 || err2 == -EEXIST) 1947 have |= POOL_WRITE; 1948 else if (err2 != -EPERM) { 1949 if (err2 == -EBLACKLISTED) 1950 fsc->blacklisted = true; 1951 err = err2; 1952 goto out_unlock; 1953 } 1954 1955 pool_ns_len = pool_ns ? pool_ns->len : 0; 1956 perm = kmalloc(sizeof(*perm) + pool_ns_len + 1, GFP_NOFS); 1957 if (!perm) { 1958 err = -ENOMEM; 1959 goto out_unlock; 1960 } 1961 1962 perm->pool = pool; 1963 perm->perm = have; 1964 perm->pool_ns_len = pool_ns_len; 1965 if (pool_ns_len > 0) 1966 memcpy(perm->pool_ns, pool_ns->str, pool_ns_len); 1967 perm->pool_ns[pool_ns_len] = 0; 1968 1969 rb_link_node(&perm->node, parent, p); 1970 rb_insert_color(&perm->node, &mdsc->pool_perm_tree); 1971 err = 0; 1972 out_unlock: 1973 up_write(&mdsc->pool_perm_rwsem); 1974 1975 ceph_osdc_put_request(rd_req); 1976 ceph_osdc_put_request(wr_req); 1977 out: 1978 if (!err) 1979 err = have; 1980 if (pool_ns) 1981 dout("__ceph_pool_perm_get pool %lld ns %.*s result = %d\n", 1982 pool, (int)pool_ns->len, pool_ns->str, err); 1983 else 1984 dout("__ceph_pool_perm_get pool %lld result = %d\n", pool, err); 1985 return err; 1986 } 1987 1988 int ceph_pool_perm_check(struct inode *inode, int need) 1989 { 1990 struct ceph_inode_info *ci = ceph_inode(inode); 1991 struct ceph_string *pool_ns; 1992 s64 pool; 1993 int ret, flags; 1994 1995 if (ci->i_vino.snap != CEPH_NOSNAP) { 1996 /* 1997 * Pool permission check needs to write to the first object. 1998 * But for snapshot, head of the first object may have alread 1999 * been deleted. Skip check to avoid creating orphan object. 2000 */ 2001 return 0; 2002 } 2003 2004 if (ceph_test_mount_opt(ceph_inode_to_client(inode), 2005 NOPOOLPERM)) 2006 return 0; 2007 2008 spin_lock(&ci->i_ceph_lock); 2009 flags = ci->i_ceph_flags; 2010 pool = ci->i_layout.pool_id; 2011 spin_unlock(&ci->i_ceph_lock); 2012 check: 2013 if (flags & CEPH_I_POOL_PERM) { 2014 if ((need & CEPH_CAP_FILE_RD) && !(flags & CEPH_I_POOL_RD)) { 2015 dout("ceph_pool_perm_check pool %lld no read perm\n", 2016 pool); 2017 return -EPERM; 2018 } 2019 if ((need & CEPH_CAP_FILE_WR) && !(flags & CEPH_I_POOL_WR)) { 2020 dout("ceph_pool_perm_check pool %lld no write perm\n", 2021 pool); 2022 return -EPERM; 2023 } 2024 return 0; 2025 } 2026 2027 pool_ns = ceph_try_get_string(ci->i_layout.pool_ns); 2028 ret = __ceph_pool_perm_get(ci, pool, pool_ns); 2029 ceph_put_string(pool_ns); 2030 if (ret < 0) 2031 return ret; 2032 2033 flags = CEPH_I_POOL_PERM; 2034 if (ret & POOL_READ) 2035 flags |= CEPH_I_POOL_RD; 2036 if (ret & POOL_WRITE) 2037 flags |= CEPH_I_POOL_WR; 2038 2039 spin_lock(&ci->i_ceph_lock); 2040 if (pool == ci->i_layout.pool_id && 2041 pool_ns == rcu_dereference_raw(ci->i_layout.pool_ns)) { 2042 ci->i_ceph_flags |= flags; 2043 } else { 2044 pool = ci->i_layout.pool_id; 2045 flags = ci->i_ceph_flags; 2046 } 2047 spin_unlock(&ci->i_ceph_lock); 2048 goto check; 2049 } 2050 2051 void ceph_pool_perm_destroy(struct ceph_mds_client *mdsc) 2052 { 2053 struct ceph_pool_perm *perm; 2054 struct rb_node *n; 2055 2056 while (!RB_EMPTY_ROOT(&mdsc->pool_perm_tree)) { 2057 n = rb_first(&mdsc->pool_perm_tree); 2058 perm = rb_entry(n, struct ceph_pool_perm, node); 2059 rb_erase(n, &mdsc->pool_perm_tree); 2060 kfree(perm); 2061 } 2062 } 2063