1 /* 2 * linux/fs/nfs/blocklayout/blocklayout.c 3 * 4 * Module for the NFSv4.1 pNFS block layout driver. 5 * 6 * Copyright (c) 2006 The Regents of the University of Michigan. 7 * All rights reserved. 8 * 9 * Andy Adamson <andros@citi.umich.edu> 10 * Fred Isaman <iisaman@umich.edu> 11 * 12 * permission is granted to use, copy, create derivative works and 13 * redistribute this software and such derivative works for any purpose, 14 * so long as the name of the university of michigan is not used in 15 * any advertising or publicity pertaining to the use or distribution 16 * of this software without specific, written prior authorization. if 17 * the above copyright notice or any other identification of the 18 * university of michigan is included in any copy of any portion of 19 * this software, then the disclaimer below must also be included. 20 * 21 * this software is provided as is, without representation from the 22 * university of michigan as to its fitness for any purpose, and without 23 * warranty by the university of michigan of any kind, either express 24 * or implied, including without limitation the implied warranties of 25 * merchantability and fitness for a particular purpose. the regents 26 * of the university of michigan shall not be liable for any damages, 27 * including special, indirect, incidental, or consequential damages, 28 * with respect to any claim arising out or in connection with the use 29 * of the software, even if it has been or is hereafter advised of the 30 * possibility of such damages. 31 */ 32 33 #include <linux/module.h> 34 #include <linux/init.h> 35 #include <linux/mount.h> 36 #include <linux/namei.h> 37 #include <linux/bio.h> /* struct bio */ 38 #include <linux/buffer_head.h> /* various write calls */ 39 #include <linux/prefetch.h> 40 #include <linux/pagevec.h> 41 42 #include "../pnfs.h" 43 #include "../nfs4session.h" 44 #include "../internal.h" 45 #include "blocklayout.h" 46 47 #define NFSDBG_FACILITY NFSDBG_PNFS_LD 48 49 MODULE_LICENSE("GPL"); 50 MODULE_AUTHOR("Andy Adamson <andros@citi.umich.edu>"); 51 MODULE_DESCRIPTION("The NFSv4.1 pNFS Block layout driver"); 52 53 static void print_page(struct page *page) 54 { 55 dprintk("PRINTPAGE page %p\n", page); 56 dprintk(" PagePrivate %d\n", PagePrivate(page)); 57 dprintk(" PageUptodate %d\n", PageUptodate(page)); 58 dprintk(" PageError %d\n", PageError(page)); 59 dprintk(" PageDirty %d\n", PageDirty(page)); 60 dprintk(" PageReferenced %d\n", PageReferenced(page)); 61 dprintk(" PageLocked %d\n", PageLocked(page)); 62 dprintk(" PageWriteback %d\n", PageWriteback(page)); 63 dprintk(" PageMappedToDisk %d\n", PageMappedToDisk(page)); 64 dprintk("\n"); 65 } 66 67 /* Given the be associated with isect, determine if page data needs to be 68 * initialized. 69 */ 70 static int is_hole(struct pnfs_block_extent *be, sector_t isect) 71 { 72 if (be->be_state == PNFS_BLOCK_NONE_DATA) 73 return 1; 74 else if (be->be_state != PNFS_BLOCK_INVALID_DATA) 75 return 0; 76 else 77 return !bl_is_sector_init(be->be_inval, isect); 78 } 79 80 /* Given the be associated with isect, determine if page data can be 81 * written to disk. 82 */ 83 static int is_writable(struct pnfs_block_extent *be, sector_t isect) 84 { 85 return (be->be_state == PNFS_BLOCK_READWRITE_DATA || 86 be->be_state == PNFS_BLOCK_INVALID_DATA); 87 } 88 89 /* The data we are handed might be spread across several bios. We need 90 * to track when the last one is finished. 91 */ 92 struct parallel_io { 93 struct kref refcnt; 94 void (*pnfs_callback) (void *data, int num_se); 95 void *data; 96 int bse_count; 97 }; 98 99 static inline struct parallel_io *alloc_parallel(void *data) 100 { 101 struct parallel_io *rv; 102 103 rv = kmalloc(sizeof(*rv), GFP_NOFS); 104 if (rv) { 105 rv->data = data; 106 kref_init(&rv->refcnt); 107 rv->bse_count = 0; 108 } 109 return rv; 110 } 111 112 static inline void get_parallel(struct parallel_io *p) 113 { 114 kref_get(&p->refcnt); 115 } 116 117 static void destroy_parallel(struct kref *kref) 118 { 119 struct parallel_io *p = container_of(kref, struct parallel_io, refcnt); 120 121 dprintk("%s enter\n", __func__); 122 p->pnfs_callback(p->data, p->bse_count); 123 kfree(p); 124 } 125 126 static inline void put_parallel(struct parallel_io *p) 127 { 128 kref_put(&p->refcnt, destroy_parallel); 129 } 130 131 static struct bio * 132 bl_submit_bio(int rw, struct bio *bio) 133 { 134 if (bio) { 135 get_parallel(bio->bi_private); 136 dprintk("%s submitting %s bio %u@%llu\n", __func__, 137 rw == READ ? "read" : "write", bio->bi_iter.bi_size, 138 (unsigned long long)bio->bi_iter.bi_sector); 139 submit_bio(rw, bio); 140 } 141 return NULL; 142 } 143 144 static struct bio *bl_alloc_init_bio(int npg, sector_t isect, 145 struct pnfs_block_extent *be, 146 void (*end_io)(struct bio *, int err), 147 struct parallel_io *par) 148 { 149 struct bio *bio; 150 151 npg = min(npg, BIO_MAX_PAGES); 152 bio = bio_alloc(GFP_NOIO, npg); 153 if (!bio && (current->flags & PF_MEMALLOC)) { 154 while (!bio && (npg /= 2)) 155 bio = bio_alloc(GFP_NOIO, npg); 156 } 157 158 if (bio) { 159 bio->bi_iter.bi_sector = isect - be->be_f_offset + 160 be->be_v_offset; 161 bio->bi_bdev = be->be_mdev; 162 bio->bi_end_io = end_io; 163 bio->bi_private = par; 164 } 165 return bio; 166 } 167 168 static struct bio *do_add_page_to_bio(struct bio *bio, int npg, int rw, 169 sector_t isect, struct page *page, 170 struct pnfs_block_extent *be, 171 void (*end_io)(struct bio *, int err), 172 struct parallel_io *par, 173 unsigned int offset, int len) 174 { 175 isect = isect + (offset >> SECTOR_SHIFT); 176 dprintk("%s: npg %d rw %d isect %llu offset %u len %d\n", __func__, 177 npg, rw, (unsigned long long)isect, offset, len); 178 retry: 179 if (!bio) { 180 bio = bl_alloc_init_bio(npg, isect, be, end_io, par); 181 if (!bio) 182 return ERR_PTR(-ENOMEM); 183 } 184 if (bio_add_page(bio, page, len, offset) < len) { 185 bio = bl_submit_bio(rw, bio); 186 goto retry; 187 } 188 return bio; 189 } 190 191 static struct bio *bl_add_page_to_bio(struct bio *bio, int npg, int rw, 192 sector_t isect, struct page *page, 193 struct pnfs_block_extent *be, 194 void (*end_io)(struct bio *, int err), 195 struct parallel_io *par) 196 { 197 return do_add_page_to_bio(bio, npg, rw, isect, page, be, 198 end_io, par, 0, PAGE_CACHE_SIZE); 199 } 200 201 /* This is basically copied from mpage_end_io_read */ 202 static void bl_end_io_read(struct bio *bio, int err) 203 { 204 struct parallel_io *par = bio->bi_private; 205 struct bio_vec *bvec; 206 int i; 207 208 if (!err) 209 bio_for_each_segment_all(bvec, bio, i) 210 SetPageUptodate(bvec->bv_page); 211 212 if (err) { 213 struct nfs_pgio_header *header = par->data; 214 215 if (!header->pnfs_error) 216 header->pnfs_error = -EIO; 217 pnfs_set_lo_fail(header->lseg); 218 } 219 bio_put(bio); 220 put_parallel(par); 221 } 222 223 static void bl_read_cleanup(struct work_struct *work) 224 { 225 struct rpc_task *task; 226 struct nfs_pgio_header *hdr; 227 dprintk("%s enter\n", __func__); 228 task = container_of(work, struct rpc_task, u.tk_work); 229 hdr = container_of(task, struct nfs_pgio_header, task); 230 pnfs_ld_read_done(hdr); 231 } 232 233 static void 234 bl_end_par_io_read(void *data, int unused) 235 { 236 struct nfs_pgio_header *hdr = data; 237 238 hdr->task.tk_status = hdr->pnfs_error; 239 INIT_WORK(&hdr->task.u.tk_work, bl_read_cleanup); 240 schedule_work(&hdr->task.u.tk_work); 241 } 242 243 static enum pnfs_try_status 244 bl_read_pagelist(struct nfs_pgio_header *hdr) 245 { 246 struct nfs_pgio_header *header = hdr; 247 int i, hole; 248 struct bio *bio = NULL; 249 struct pnfs_block_extent *be = NULL, *cow_read = NULL; 250 sector_t isect, extent_length = 0; 251 struct parallel_io *par; 252 loff_t f_offset = hdr->args.offset; 253 size_t bytes_left = hdr->args.count; 254 unsigned int pg_offset, pg_len; 255 struct page **pages = hdr->args.pages; 256 int pg_index = hdr->args.pgbase >> PAGE_CACHE_SHIFT; 257 const bool is_dio = (header->dreq != NULL); 258 259 dprintk("%s enter nr_pages %u offset %lld count %u\n", __func__, 260 hdr->page_array.npages, f_offset, 261 (unsigned int)hdr->args.count); 262 263 par = alloc_parallel(hdr); 264 if (!par) 265 goto use_mds; 266 par->pnfs_callback = bl_end_par_io_read; 267 /* At this point, we can no longer jump to use_mds */ 268 269 isect = (sector_t) (f_offset >> SECTOR_SHIFT); 270 /* Code assumes extents are page-aligned */ 271 for (i = pg_index; i < hdr->page_array.npages; i++) { 272 if (!extent_length) { 273 /* We've used up the previous extent */ 274 bl_put_extent(be); 275 bl_put_extent(cow_read); 276 bio = bl_submit_bio(READ, bio); 277 /* Get the next one */ 278 be = bl_find_get_extent(BLK_LSEG2EXT(header->lseg), 279 isect, &cow_read); 280 if (!be) { 281 header->pnfs_error = -EIO; 282 goto out; 283 } 284 extent_length = be->be_length - 285 (isect - be->be_f_offset); 286 if (cow_read) { 287 sector_t cow_length = cow_read->be_length - 288 (isect - cow_read->be_f_offset); 289 extent_length = min(extent_length, cow_length); 290 } 291 } 292 293 if (is_dio) { 294 pg_offset = f_offset & ~PAGE_CACHE_MASK; 295 if (pg_offset + bytes_left > PAGE_CACHE_SIZE) 296 pg_len = PAGE_CACHE_SIZE - pg_offset; 297 else 298 pg_len = bytes_left; 299 300 f_offset += pg_len; 301 bytes_left -= pg_len; 302 isect += (pg_offset >> SECTOR_SHIFT); 303 } else { 304 pg_offset = 0; 305 pg_len = PAGE_CACHE_SIZE; 306 } 307 308 hole = is_hole(be, isect); 309 if (hole && !cow_read) { 310 bio = bl_submit_bio(READ, bio); 311 /* Fill hole w/ zeroes w/o accessing device */ 312 dprintk("%s Zeroing page for hole\n", __func__); 313 zero_user_segment(pages[i], pg_offset, pg_len); 314 print_page(pages[i]); 315 SetPageUptodate(pages[i]); 316 } else { 317 struct pnfs_block_extent *be_read; 318 319 be_read = (hole && cow_read) ? cow_read : be; 320 bio = do_add_page_to_bio(bio, 321 hdr->page_array.npages - i, 322 READ, 323 isect, pages[i], be_read, 324 bl_end_io_read, par, 325 pg_offset, pg_len); 326 if (IS_ERR(bio)) { 327 header->pnfs_error = PTR_ERR(bio); 328 bio = NULL; 329 goto out; 330 } 331 } 332 isect += (pg_len >> SECTOR_SHIFT); 333 extent_length -= PAGE_CACHE_SECTORS; 334 } 335 if ((isect << SECTOR_SHIFT) >= header->inode->i_size) { 336 hdr->res.eof = 1; 337 hdr->res.count = header->inode->i_size - hdr->args.offset; 338 } else { 339 hdr->res.count = (isect << SECTOR_SHIFT) - hdr->args.offset; 340 } 341 out: 342 bl_put_extent(be); 343 bl_put_extent(cow_read); 344 bl_submit_bio(READ, bio); 345 put_parallel(par); 346 return PNFS_ATTEMPTED; 347 348 use_mds: 349 dprintk("Giving up and using normal NFS\n"); 350 return PNFS_NOT_ATTEMPTED; 351 } 352 353 static void mark_extents_written(struct pnfs_block_layout *bl, 354 __u64 offset, __u32 count) 355 { 356 sector_t isect, end; 357 struct pnfs_block_extent *be; 358 struct pnfs_block_short_extent *se; 359 360 dprintk("%s(%llu, %u)\n", __func__, offset, count); 361 if (count == 0) 362 return; 363 isect = (offset & (long)(PAGE_CACHE_MASK)) >> SECTOR_SHIFT; 364 end = (offset + count + PAGE_CACHE_SIZE - 1) & (long)(PAGE_CACHE_MASK); 365 end >>= SECTOR_SHIFT; 366 while (isect < end) { 367 sector_t len; 368 be = bl_find_get_extent(bl, isect, NULL); 369 BUG_ON(!be); /* FIXME */ 370 len = min(end, be->be_f_offset + be->be_length) - isect; 371 if (be->be_state == PNFS_BLOCK_INVALID_DATA) { 372 se = bl_pop_one_short_extent(be->be_inval); 373 BUG_ON(!se); 374 bl_mark_for_commit(be, isect, len, se); 375 } 376 isect += len; 377 bl_put_extent(be); 378 } 379 } 380 381 static void bl_end_io_write_zero(struct bio *bio, int err) 382 { 383 struct parallel_io *par = bio->bi_private; 384 struct bio_vec *bvec; 385 int i; 386 387 bio_for_each_segment_all(bvec, bio, i) { 388 /* This is the zeroing page we added */ 389 end_page_writeback(bvec->bv_page); 390 page_cache_release(bvec->bv_page); 391 } 392 393 if (unlikely(err)) { 394 struct nfs_pgio_header *header = par->data; 395 396 if (!header->pnfs_error) 397 header->pnfs_error = -EIO; 398 pnfs_set_lo_fail(header->lseg); 399 } 400 bio_put(bio); 401 put_parallel(par); 402 } 403 404 static void bl_end_io_write(struct bio *bio, int err) 405 { 406 struct parallel_io *par = bio->bi_private; 407 const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); 408 struct nfs_pgio_header *header = par->data; 409 410 if (!uptodate) { 411 if (!header->pnfs_error) 412 header->pnfs_error = -EIO; 413 pnfs_set_lo_fail(header->lseg); 414 } 415 bio_put(bio); 416 put_parallel(par); 417 } 418 419 /* Function scheduled for call during bl_end_par_io_write, 420 * it marks sectors as written and extends the commitlist. 421 */ 422 static void bl_write_cleanup(struct work_struct *work) 423 { 424 struct rpc_task *task; 425 struct nfs_pgio_header *hdr; 426 dprintk("%s enter\n", __func__); 427 task = container_of(work, struct rpc_task, u.tk_work); 428 hdr = container_of(task, struct nfs_pgio_header, task); 429 if (likely(!hdr->pnfs_error)) { 430 /* Marks for LAYOUTCOMMIT */ 431 mark_extents_written(BLK_LSEG2EXT(hdr->lseg), 432 hdr->args.offset, hdr->args.count); 433 } 434 pnfs_ld_write_done(hdr); 435 } 436 437 /* Called when last of bios associated with a bl_write_pagelist call finishes */ 438 static void bl_end_par_io_write(void *data, int num_se) 439 { 440 struct nfs_pgio_header *hdr = data; 441 442 if (unlikely(hdr->pnfs_error)) { 443 bl_free_short_extents(&BLK_LSEG2EXT(hdr->lseg)->bl_inval, 444 num_se); 445 } 446 447 hdr->task.tk_status = hdr->pnfs_error; 448 hdr->verf.committed = NFS_FILE_SYNC; 449 INIT_WORK(&hdr->task.u.tk_work, bl_write_cleanup); 450 schedule_work(&hdr->task.u.tk_work); 451 } 452 453 /* FIXME STUB - mark intersection of layout and page as bad, so is not 454 * used again. 455 */ 456 static void mark_bad_read(void) 457 { 458 return; 459 } 460 461 /* 462 * map_block: map a requested I/0 block (isect) into an offset in the LVM 463 * block_device 464 */ 465 static void 466 map_block(struct buffer_head *bh, sector_t isect, struct pnfs_block_extent *be) 467 { 468 dprintk("%s enter be=%p\n", __func__, be); 469 470 set_buffer_mapped(bh); 471 bh->b_bdev = be->be_mdev; 472 bh->b_blocknr = (isect - be->be_f_offset + be->be_v_offset) >> 473 (be->be_mdev->bd_inode->i_blkbits - SECTOR_SHIFT); 474 475 dprintk("%s isect %llu, bh->b_blocknr %ld, using bsize %Zd\n", 476 __func__, (unsigned long long)isect, (long)bh->b_blocknr, 477 bh->b_size); 478 return; 479 } 480 481 static void 482 bl_read_single_end_io(struct bio *bio, int error) 483 { 484 struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1; 485 struct page *page = bvec->bv_page; 486 487 /* Only one page in bvec */ 488 unlock_page(page); 489 } 490 491 static int 492 bl_do_readpage_sync(struct page *page, struct pnfs_block_extent *be, 493 unsigned int offset, unsigned int len) 494 { 495 struct bio *bio; 496 struct page *shadow_page; 497 sector_t isect; 498 char *kaddr, *kshadow_addr; 499 int ret = 0; 500 501 dprintk("%s: offset %u len %u\n", __func__, offset, len); 502 503 shadow_page = alloc_page(GFP_NOFS | __GFP_HIGHMEM); 504 if (shadow_page == NULL) 505 return -ENOMEM; 506 507 bio = bio_alloc(GFP_NOIO, 1); 508 if (bio == NULL) 509 return -ENOMEM; 510 511 isect = (page->index << PAGE_CACHE_SECTOR_SHIFT) + 512 (offset / SECTOR_SIZE); 513 514 bio->bi_iter.bi_sector = isect - be->be_f_offset + be->be_v_offset; 515 bio->bi_bdev = be->be_mdev; 516 bio->bi_end_io = bl_read_single_end_io; 517 518 lock_page(shadow_page); 519 if (bio_add_page(bio, shadow_page, 520 SECTOR_SIZE, round_down(offset, SECTOR_SIZE)) == 0) { 521 unlock_page(shadow_page); 522 bio_put(bio); 523 return -EIO; 524 } 525 526 submit_bio(READ, bio); 527 wait_on_page_locked(shadow_page); 528 if (unlikely(!test_bit(BIO_UPTODATE, &bio->bi_flags))) { 529 ret = -EIO; 530 } else { 531 kaddr = kmap_atomic(page); 532 kshadow_addr = kmap_atomic(shadow_page); 533 memcpy(kaddr + offset, kshadow_addr + offset, len); 534 kunmap_atomic(kshadow_addr); 535 kunmap_atomic(kaddr); 536 } 537 __free_page(shadow_page); 538 bio_put(bio); 539 540 return ret; 541 } 542 543 static int 544 bl_read_partial_page_sync(struct page *page, struct pnfs_block_extent *be, 545 unsigned int dirty_offset, unsigned int dirty_len, 546 bool full_page) 547 { 548 int ret = 0; 549 unsigned int start, end; 550 551 if (full_page) { 552 start = 0; 553 end = PAGE_CACHE_SIZE; 554 } else { 555 start = round_down(dirty_offset, SECTOR_SIZE); 556 end = round_up(dirty_offset + dirty_len, SECTOR_SIZE); 557 } 558 559 dprintk("%s: offset %u len %d\n", __func__, dirty_offset, dirty_len); 560 if (!be) { 561 zero_user_segments(page, start, dirty_offset, 562 dirty_offset + dirty_len, end); 563 if (start == 0 && end == PAGE_CACHE_SIZE && 564 trylock_page(page)) { 565 SetPageUptodate(page); 566 unlock_page(page); 567 } 568 return ret; 569 } 570 571 if (start != dirty_offset) 572 ret = bl_do_readpage_sync(page, be, start, dirty_offset - start); 573 574 if (!ret && (dirty_offset + dirty_len < end)) 575 ret = bl_do_readpage_sync(page, be, dirty_offset + dirty_len, 576 end - dirty_offset - dirty_len); 577 578 return ret; 579 } 580 581 /* Given an unmapped page, zero it or read in page for COW, page is locked 582 * by caller. 583 */ 584 static int 585 init_page_for_write(struct page *page, struct pnfs_block_extent *cow_read) 586 { 587 struct buffer_head *bh = NULL; 588 int ret = 0; 589 sector_t isect; 590 591 dprintk("%s enter, %p\n", __func__, page); 592 BUG_ON(PageUptodate(page)); 593 if (!cow_read) { 594 zero_user_segment(page, 0, PAGE_SIZE); 595 SetPageUptodate(page); 596 goto cleanup; 597 } 598 599 bh = alloc_page_buffers(page, PAGE_CACHE_SIZE, 0); 600 if (!bh) { 601 ret = -ENOMEM; 602 goto cleanup; 603 } 604 605 isect = (sector_t) page->index << PAGE_CACHE_SECTOR_SHIFT; 606 map_block(bh, isect, cow_read); 607 if (!bh_uptodate_or_lock(bh)) 608 ret = bh_submit_read(bh); 609 if (ret) 610 goto cleanup; 611 SetPageUptodate(page); 612 613 cleanup: 614 if (bh) 615 free_buffer_head(bh); 616 if (ret) { 617 /* Need to mark layout with bad read...should now 618 * just use nfs4 for reads and writes. 619 */ 620 mark_bad_read(); 621 } 622 return ret; 623 } 624 625 /* Find or create a zeroing page marked being writeback. 626 * Return ERR_PTR on error, NULL to indicate skip this page and page itself 627 * to indicate write out. 628 */ 629 static struct page * 630 bl_find_get_zeroing_page(struct inode *inode, pgoff_t index, 631 struct pnfs_block_extent *cow_read) 632 { 633 struct page *page; 634 int locked = 0; 635 page = find_get_page(inode->i_mapping, index); 636 if (page) 637 goto check_page; 638 639 page = find_or_create_page(inode->i_mapping, index, GFP_NOFS); 640 if (unlikely(!page)) { 641 dprintk("%s oom\n", __func__); 642 return ERR_PTR(-ENOMEM); 643 } 644 locked = 1; 645 646 check_page: 647 /* PageDirty: Other will write this out 648 * PageWriteback: Other is writing this out 649 * PageUptodate: It was read before 650 */ 651 if (PageDirty(page) || PageWriteback(page)) { 652 print_page(page); 653 if (locked) 654 unlock_page(page); 655 page_cache_release(page); 656 return NULL; 657 } 658 659 if (!locked) { 660 lock_page(page); 661 locked = 1; 662 goto check_page; 663 } 664 if (!PageUptodate(page)) { 665 /* New page, readin or zero it */ 666 init_page_for_write(page, cow_read); 667 } 668 set_page_writeback(page); 669 unlock_page(page); 670 671 return page; 672 } 673 674 static enum pnfs_try_status 675 bl_write_pagelist(struct nfs_pgio_header *header, int sync) 676 { 677 int i, ret, npg_zero, pg_index, last = 0; 678 struct bio *bio = NULL; 679 struct pnfs_block_extent *be = NULL, *cow_read = NULL; 680 sector_t isect, last_isect = 0, extent_length = 0; 681 struct parallel_io *par = NULL; 682 loff_t offset = header->args.offset; 683 size_t count = header->args.count; 684 unsigned int pg_offset, pg_len, saved_len; 685 struct page **pages = header->args.pages; 686 struct page *page; 687 pgoff_t index; 688 u64 temp; 689 int npg_per_block = 690 NFS_SERVER(header->inode)->pnfs_blksize >> PAGE_CACHE_SHIFT; 691 692 dprintk("%s enter, %Zu@%lld\n", __func__, count, offset); 693 694 if (header->dreq != NULL && 695 (!IS_ALIGNED(offset, NFS_SERVER(header->inode)->pnfs_blksize) || 696 !IS_ALIGNED(count, NFS_SERVER(header->inode)->pnfs_blksize))) { 697 dprintk("pnfsblock nonblock aligned DIO writes. Resend MDS\n"); 698 goto out_mds; 699 } 700 /* At this point, header->page_aray is a (sequential) list of nfs_pages. 701 * We want to write each, and if there is an error set pnfs_error 702 * to have it redone using nfs. 703 */ 704 par = alloc_parallel(header); 705 if (!par) 706 goto out_mds; 707 par->pnfs_callback = bl_end_par_io_write; 708 /* At this point, have to be more careful with error handling */ 709 710 isect = (sector_t) ((offset & (long)PAGE_CACHE_MASK) >> SECTOR_SHIFT); 711 be = bl_find_get_extent(BLK_LSEG2EXT(header->lseg), isect, &cow_read); 712 if (!be || !is_writable(be, isect)) { 713 dprintk("%s no matching extents!\n", __func__); 714 goto out_mds; 715 } 716 717 /* First page inside INVALID extent */ 718 if (be->be_state == PNFS_BLOCK_INVALID_DATA) { 719 if (likely(!bl_push_one_short_extent(be->be_inval))) 720 par->bse_count++; 721 else 722 goto out_mds; 723 temp = offset >> PAGE_CACHE_SHIFT; 724 npg_zero = do_div(temp, npg_per_block); 725 isect = (sector_t) (((offset - npg_zero * PAGE_CACHE_SIZE) & 726 (long)PAGE_CACHE_MASK) >> SECTOR_SHIFT); 727 extent_length = be->be_length - (isect - be->be_f_offset); 728 729 fill_invalid_ext: 730 dprintk("%s need to zero %d pages\n", __func__, npg_zero); 731 for (;npg_zero > 0; npg_zero--) { 732 if (bl_is_sector_init(be->be_inval, isect)) { 733 dprintk("isect %llu already init\n", 734 (unsigned long long)isect); 735 goto next_page; 736 } 737 /* page ref released in bl_end_io_write_zero */ 738 index = isect >> PAGE_CACHE_SECTOR_SHIFT; 739 dprintk("%s zero %dth page: index %lu isect %llu\n", 740 __func__, npg_zero, index, 741 (unsigned long long)isect); 742 page = bl_find_get_zeroing_page(header->inode, index, 743 cow_read); 744 if (unlikely(IS_ERR(page))) { 745 header->pnfs_error = PTR_ERR(page); 746 goto out; 747 } else if (page == NULL) 748 goto next_page; 749 750 ret = bl_mark_sectors_init(be->be_inval, isect, 751 PAGE_CACHE_SECTORS); 752 if (unlikely(ret)) { 753 dprintk("%s bl_mark_sectors_init fail %d\n", 754 __func__, ret); 755 end_page_writeback(page); 756 page_cache_release(page); 757 header->pnfs_error = ret; 758 goto out; 759 } 760 if (likely(!bl_push_one_short_extent(be->be_inval))) 761 par->bse_count++; 762 else { 763 end_page_writeback(page); 764 page_cache_release(page); 765 header->pnfs_error = -ENOMEM; 766 goto out; 767 } 768 /* FIXME: This should be done in bi_end_io */ 769 mark_extents_written(BLK_LSEG2EXT(header->lseg), 770 page->index << PAGE_CACHE_SHIFT, 771 PAGE_CACHE_SIZE); 772 773 bio = bl_add_page_to_bio(bio, npg_zero, WRITE, 774 isect, page, be, 775 bl_end_io_write_zero, par); 776 if (IS_ERR(bio)) { 777 header->pnfs_error = PTR_ERR(bio); 778 bio = NULL; 779 goto out; 780 } 781 next_page: 782 isect += PAGE_CACHE_SECTORS; 783 extent_length -= PAGE_CACHE_SECTORS; 784 } 785 if (last) 786 goto write_done; 787 } 788 bio = bl_submit_bio(WRITE, bio); 789 790 /* Middle pages */ 791 pg_index = header->args.pgbase >> PAGE_CACHE_SHIFT; 792 for (i = pg_index; i < header->page_array.npages; i++) { 793 if (!extent_length) { 794 /* We've used up the previous extent */ 795 bl_put_extent(be); 796 bl_put_extent(cow_read); 797 bio = bl_submit_bio(WRITE, bio); 798 /* Get the next one */ 799 be = bl_find_get_extent(BLK_LSEG2EXT(header->lseg), 800 isect, &cow_read); 801 if (!be || !is_writable(be, isect)) { 802 header->pnfs_error = -EINVAL; 803 goto out; 804 } 805 if (be->be_state == PNFS_BLOCK_INVALID_DATA) { 806 if (likely(!bl_push_one_short_extent( 807 be->be_inval))) 808 par->bse_count++; 809 else { 810 header->pnfs_error = -ENOMEM; 811 goto out; 812 } 813 } 814 extent_length = be->be_length - 815 (isect - be->be_f_offset); 816 } 817 818 dprintk("%s offset %lld count %Zu\n", __func__, offset, count); 819 pg_offset = offset & ~PAGE_CACHE_MASK; 820 if (pg_offset + count > PAGE_CACHE_SIZE) 821 pg_len = PAGE_CACHE_SIZE - pg_offset; 822 else 823 pg_len = count; 824 825 saved_len = pg_len; 826 if (be->be_state == PNFS_BLOCK_INVALID_DATA && 827 !bl_is_sector_init(be->be_inval, isect)) { 828 ret = bl_read_partial_page_sync(pages[i], cow_read, 829 pg_offset, pg_len, true); 830 if (ret) { 831 dprintk("%s bl_read_partial_page_sync fail %d\n", 832 __func__, ret); 833 header->pnfs_error = ret; 834 goto out; 835 } 836 837 ret = bl_mark_sectors_init(be->be_inval, isect, 838 PAGE_CACHE_SECTORS); 839 if (unlikely(ret)) { 840 dprintk("%s bl_mark_sectors_init fail %d\n", 841 __func__, ret); 842 header->pnfs_error = ret; 843 goto out; 844 } 845 846 /* Expand to full page write */ 847 pg_offset = 0; 848 pg_len = PAGE_CACHE_SIZE; 849 } else if ((pg_offset & (SECTOR_SIZE - 1)) || 850 (pg_len & (SECTOR_SIZE - 1))){ 851 /* ahh, nasty case. We have to do sync full sector 852 * read-modify-write cycles. 853 */ 854 unsigned int saved_offset = pg_offset; 855 ret = bl_read_partial_page_sync(pages[i], be, pg_offset, 856 pg_len, false); 857 pg_offset = round_down(pg_offset, SECTOR_SIZE); 858 pg_len = round_up(saved_offset + pg_len, SECTOR_SIZE) 859 - pg_offset; 860 } 861 862 863 bio = do_add_page_to_bio(bio, header->page_array.npages - i, 864 WRITE, 865 isect, pages[i], be, 866 bl_end_io_write, par, 867 pg_offset, pg_len); 868 if (IS_ERR(bio)) { 869 header->pnfs_error = PTR_ERR(bio); 870 bio = NULL; 871 goto out; 872 } 873 offset += saved_len; 874 count -= saved_len; 875 isect += PAGE_CACHE_SECTORS; 876 last_isect = isect; 877 extent_length -= PAGE_CACHE_SECTORS; 878 } 879 880 /* Last page inside INVALID extent */ 881 if (be->be_state == PNFS_BLOCK_INVALID_DATA) { 882 bio = bl_submit_bio(WRITE, bio); 883 temp = last_isect >> PAGE_CACHE_SECTOR_SHIFT; 884 npg_zero = npg_per_block - do_div(temp, npg_per_block); 885 if (npg_zero < npg_per_block) { 886 last = 1; 887 goto fill_invalid_ext; 888 } 889 } 890 891 write_done: 892 header->res.count = header->args.count; 893 out: 894 bl_put_extent(be); 895 bl_put_extent(cow_read); 896 bl_submit_bio(WRITE, bio); 897 put_parallel(par); 898 return PNFS_ATTEMPTED; 899 out_mds: 900 bl_put_extent(be); 901 bl_put_extent(cow_read); 902 kfree(par); 903 return PNFS_NOT_ATTEMPTED; 904 } 905 906 /* FIXME - range ignored */ 907 static void 908 release_extents(struct pnfs_block_layout *bl, struct pnfs_layout_range *range) 909 { 910 int i; 911 struct pnfs_block_extent *be; 912 913 spin_lock(&bl->bl_ext_lock); 914 for (i = 0; i < EXTENT_LISTS; i++) { 915 while (!list_empty(&bl->bl_extents[i])) { 916 be = list_first_entry(&bl->bl_extents[i], 917 struct pnfs_block_extent, 918 be_node); 919 list_del(&be->be_node); 920 bl_put_extent(be); 921 } 922 } 923 spin_unlock(&bl->bl_ext_lock); 924 } 925 926 static void 927 release_inval_marks(struct pnfs_inval_markings *marks) 928 { 929 struct pnfs_inval_tracking *pos, *temp; 930 struct pnfs_block_short_extent *se, *stemp; 931 932 list_for_each_entry_safe(pos, temp, &marks->im_tree.mtt_stub, it_link) { 933 list_del(&pos->it_link); 934 kfree(pos); 935 } 936 937 list_for_each_entry_safe(se, stemp, &marks->im_extents, bse_node) { 938 list_del(&se->bse_node); 939 kfree(se); 940 } 941 return; 942 } 943 944 static void bl_free_layout_hdr(struct pnfs_layout_hdr *lo) 945 { 946 struct pnfs_block_layout *bl = BLK_LO2EXT(lo); 947 948 dprintk("%s enter\n", __func__); 949 release_extents(bl, NULL); 950 release_inval_marks(&bl->bl_inval); 951 kfree(bl); 952 } 953 954 static struct pnfs_layout_hdr *bl_alloc_layout_hdr(struct inode *inode, 955 gfp_t gfp_flags) 956 { 957 struct pnfs_block_layout *bl; 958 959 dprintk("%s enter\n", __func__); 960 bl = kzalloc(sizeof(*bl), gfp_flags); 961 if (!bl) 962 return NULL; 963 spin_lock_init(&bl->bl_ext_lock); 964 INIT_LIST_HEAD(&bl->bl_extents[0]); 965 INIT_LIST_HEAD(&bl->bl_extents[1]); 966 INIT_LIST_HEAD(&bl->bl_commit); 967 INIT_LIST_HEAD(&bl->bl_committing); 968 bl->bl_count = 0; 969 bl->bl_blocksize = NFS_SERVER(inode)->pnfs_blksize >> SECTOR_SHIFT; 970 BL_INIT_INVAL_MARKS(&bl->bl_inval, bl->bl_blocksize); 971 return &bl->bl_layout; 972 } 973 974 static void bl_free_lseg(struct pnfs_layout_segment *lseg) 975 { 976 dprintk("%s enter\n", __func__); 977 kfree(lseg); 978 } 979 980 /* We pretty much ignore lseg, and store all data layout wide, so we 981 * can correctly merge. 982 */ 983 static struct pnfs_layout_segment *bl_alloc_lseg(struct pnfs_layout_hdr *lo, 984 struct nfs4_layoutget_res *lgr, 985 gfp_t gfp_flags) 986 { 987 struct pnfs_layout_segment *lseg; 988 int status; 989 990 dprintk("%s enter\n", __func__); 991 lseg = kzalloc(sizeof(*lseg), gfp_flags); 992 if (!lseg) 993 return ERR_PTR(-ENOMEM); 994 status = nfs4_blk_process_layoutget(lo, lgr, gfp_flags); 995 if (status) { 996 /* We don't want to call the full-blown bl_free_lseg, 997 * since on error extents were not touched. 998 */ 999 kfree(lseg); 1000 return ERR_PTR(status); 1001 } 1002 return lseg; 1003 } 1004 1005 static void 1006 bl_encode_layoutcommit(struct pnfs_layout_hdr *lo, struct xdr_stream *xdr, 1007 const struct nfs4_layoutcommit_args *arg) 1008 { 1009 dprintk("%s enter\n", __func__); 1010 encode_pnfs_block_layoutupdate(BLK_LO2EXT(lo), xdr, arg); 1011 } 1012 1013 static void 1014 bl_cleanup_layoutcommit(struct nfs4_layoutcommit_data *lcdata) 1015 { 1016 struct pnfs_layout_hdr *lo = NFS_I(lcdata->args.inode)->layout; 1017 1018 dprintk("%s enter\n", __func__); 1019 clean_pnfs_block_layoutupdate(BLK_LO2EXT(lo), &lcdata->args, lcdata->res.status); 1020 } 1021 1022 static void free_blk_mountid(struct block_mount_id *mid) 1023 { 1024 if (mid) { 1025 struct pnfs_block_dev *dev, *tmp; 1026 1027 /* No need to take bm_lock as we are last user freeing bm_devlist */ 1028 list_for_each_entry_safe(dev, tmp, &mid->bm_devlist, bm_node) { 1029 list_del(&dev->bm_node); 1030 bl_free_block_dev(dev); 1031 } 1032 kfree(mid); 1033 } 1034 } 1035 1036 /* This is mostly copied from the filelayout_get_device_info function. 1037 * It seems much of this should be at the generic pnfs level. 1038 */ 1039 static struct pnfs_block_dev * 1040 nfs4_blk_get_deviceinfo(struct nfs_server *server, const struct nfs_fh *fh, 1041 struct nfs4_deviceid *d_id) 1042 { 1043 struct pnfs_device *dev; 1044 struct pnfs_block_dev *rv; 1045 u32 max_resp_sz; 1046 int max_pages; 1047 struct page **pages = NULL; 1048 int i, rc; 1049 1050 /* 1051 * Use the session max response size as the basis for setting 1052 * GETDEVICEINFO's maxcount 1053 */ 1054 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz; 1055 max_pages = nfs_page_array_len(0, max_resp_sz); 1056 dprintk("%s max_resp_sz %u max_pages %d\n", 1057 __func__, max_resp_sz, max_pages); 1058 1059 dev = kmalloc(sizeof(*dev), GFP_NOFS); 1060 if (!dev) { 1061 dprintk("%s kmalloc failed\n", __func__); 1062 return ERR_PTR(-ENOMEM); 1063 } 1064 1065 pages = kcalloc(max_pages, sizeof(struct page *), GFP_NOFS); 1066 if (pages == NULL) { 1067 kfree(dev); 1068 return ERR_PTR(-ENOMEM); 1069 } 1070 for (i = 0; i < max_pages; i++) { 1071 pages[i] = alloc_page(GFP_NOFS); 1072 if (!pages[i]) { 1073 rv = ERR_PTR(-ENOMEM); 1074 goto out_free; 1075 } 1076 } 1077 1078 memcpy(&dev->dev_id, d_id, sizeof(*d_id)); 1079 dev->layout_type = LAYOUT_BLOCK_VOLUME; 1080 dev->pages = pages; 1081 dev->pgbase = 0; 1082 dev->pglen = PAGE_SIZE * max_pages; 1083 dev->mincount = 0; 1084 dev->maxcount = max_resp_sz - nfs41_maxgetdevinfo_overhead; 1085 1086 dprintk("%s: dev_id: %s\n", __func__, dev->dev_id.data); 1087 rc = nfs4_proc_getdeviceinfo(server, dev, NULL); 1088 dprintk("%s getdevice info returns %d\n", __func__, rc); 1089 if (rc) { 1090 rv = ERR_PTR(rc); 1091 goto out_free; 1092 } 1093 1094 rv = nfs4_blk_decode_device(server, dev); 1095 out_free: 1096 for (i = 0; i < max_pages; i++) 1097 __free_page(pages[i]); 1098 kfree(pages); 1099 kfree(dev); 1100 return rv; 1101 } 1102 1103 static int 1104 bl_set_layoutdriver(struct nfs_server *server, const struct nfs_fh *fh) 1105 { 1106 struct block_mount_id *b_mt_id = NULL; 1107 struct pnfs_devicelist *dlist = NULL; 1108 struct pnfs_block_dev *bdev; 1109 LIST_HEAD(block_disklist); 1110 int status, i; 1111 1112 dprintk("%s enter\n", __func__); 1113 1114 if (server->pnfs_blksize == 0) { 1115 dprintk("%s Server did not return blksize\n", __func__); 1116 return -EINVAL; 1117 } 1118 b_mt_id = kzalloc(sizeof(struct block_mount_id), GFP_NOFS); 1119 if (!b_mt_id) { 1120 status = -ENOMEM; 1121 goto out_error; 1122 } 1123 /* Initialize nfs4 block layout mount id */ 1124 spin_lock_init(&b_mt_id->bm_lock); 1125 INIT_LIST_HEAD(&b_mt_id->bm_devlist); 1126 1127 dlist = kmalloc(sizeof(struct pnfs_devicelist), GFP_NOFS); 1128 if (!dlist) { 1129 status = -ENOMEM; 1130 goto out_error; 1131 } 1132 dlist->eof = 0; 1133 while (!dlist->eof) { 1134 status = nfs4_proc_getdevicelist(server, fh, dlist); 1135 if (status) 1136 goto out_error; 1137 dprintk("%s GETDEVICELIST numdevs=%i, eof=%i\n", 1138 __func__, dlist->num_devs, dlist->eof); 1139 for (i = 0; i < dlist->num_devs; i++) { 1140 bdev = nfs4_blk_get_deviceinfo(server, fh, 1141 &dlist->dev_id[i]); 1142 if (IS_ERR(bdev)) { 1143 status = PTR_ERR(bdev); 1144 goto out_error; 1145 } 1146 spin_lock(&b_mt_id->bm_lock); 1147 list_add(&bdev->bm_node, &b_mt_id->bm_devlist); 1148 spin_unlock(&b_mt_id->bm_lock); 1149 } 1150 } 1151 dprintk("%s SUCCESS\n", __func__); 1152 server->pnfs_ld_data = b_mt_id; 1153 1154 out_return: 1155 kfree(dlist); 1156 return status; 1157 1158 out_error: 1159 free_blk_mountid(b_mt_id); 1160 goto out_return; 1161 } 1162 1163 static int 1164 bl_clear_layoutdriver(struct nfs_server *server) 1165 { 1166 struct block_mount_id *b_mt_id = server->pnfs_ld_data; 1167 1168 dprintk("%s enter\n", __func__); 1169 free_blk_mountid(b_mt_id); 1170 dprintk("%s RETURNS\n", __func__); 1171 return 0; 1172 } 1173 1174 static bool 1175 is_aligned_req(struct nfs_page *req, unsigned int alignment) 1176 { 1177 return IS_ALIGNED(req->wb_offset, alignment) && 1178 IS_ALIGNED(req->wb_bytes, alignment); 1179 } 1180 1181 static void 1182 bl_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req) 1183 { 1184 if (pgio->pg_dreq != NULL && 1185 !is_aligned_req(req, SECTOR_SIZE)) 1186 nfs_pageio_reset_read_mds(pgio); 1187 else 1188 pnfs_generic_pg_init_read(pgio, req); 1189 } 1190 1191 /* 1192 * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number 1193 * of bytes (maximum @req->wb_bytes) that can be coalesced. 1194 */ 1195 static size_t 1196 bl_pg_test_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev, 1197 struct nfs_page *req) 1198 { 1199 if (pgio->pg_dreq != NULL && 1200 !is_aligned_req(req, SECTOR_SIZE)) 1201 return 0; 1202 1203 return pnfs_generic_pg_test(pgio, prev, req); 1204 } 1205 1206 /* 1207 * Return the number of contiguous bytes for a given inode 1208 * starting at page frame idx. 1209 */ 1210 static u64 pnfs_num_cont_bytes(struct inode *inode, pgoff_t idx) 1211 { 1212 struct address_space *mapping = inode->i_mapping; 1213 pgoff_t end; 1214 1215 /* Optimize common case that writes from 0 to end of file */ 1216 end = DIV_ROUND_UP(i_size_read(inode), PAGE_CACHE_SIZE); 1217 if (end != NFS_I(inode)->npages) { 1218 rcu_read_lock(); 1219 end = page_cache_next_hole(mapping, idx + 1, ULONG_MAX); 1220 rcu_read_unlock(); 1221 } 1222 1223 if (!end) 1224 return i_size_read(inode) - (idx << PAGE_CACHE_SHIFT); 1225 else 1226 return (end - idx) << PAGE_CACHE_SHIFT; 1227 } 1228 1229 static void 1230 bl_pg_init_write(struct nfs_pageio_descriptor *pgio, struct nfs_page *req) 1231 { 1232 if (pgio->pg_dreq != NULL && 1233 !is_aligned_req(req, PAGE_CACHE_SIZE)) { 1234 nfs_pageio_reset_write_mds(pgio); 1235 } else { 1236 u64 wb_size; 1237 if (pgio->pg_dreq == NULL) 1238 wb_size = pnfs_num_cont_bytes(pgio->pg_inode, 1239 req->wb_index); 1240 else 1241 wb_size = nfs_dreq_bytes_left(pgio->pg_dreq); 1242 1243 pnfs_generic_pg_init_write(pgio, req, wb_size); 1244 } 1245 } 1246 1247 /* 1248 * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number 1249 * of bytes (maximum @req->wb_bytes) that can be coalesced. 1250 */ 1251 static size_t 1252 bl_pg_test_write(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev, 1253 struct nfs_page *req) 1254 { 1255 if (pgio->pg_dreq != NULL && 1256 !is_aligned_req(req, PAGE_CACHE_SIZE)) 1257 return 0; 1258 1259 return pnfs_generic_pg_test(pgio, prev, req); 1260 } 1261 1262 static const struct nfs_pageio_ops bl_pg_read_ops = { 1263 .pg_init = bl_pg_init_read, 1264 .pg_test = bl_pg_test_read, 1265 .pg_doio = pnfs_generic_pg_readpages, 1266 }; 1267 1268 static const struct nfs_pageio_ops bl_pg_write_ops = { 1269 .pg_init = bl_pg_init_write, 1270 .pg_test = bl_pg_test_write, 1271 .pg_doio = pnfs_generic_pg_writepages, 1272 }; 1273 1274 static struct pnfs_layoutdriver_type blocklayout_type = { 1275 .id = LAYOUT_BLOCK_VOLUME, 1276 .name = "LAYOUT_BLOCK_VOLUME", 1277 .owner = THIS_MODULE, 1278 .read_pagelist = bl_read_pagelist, 1279 .write_pagelist = bl_write_pagelist, 1280 .alloc_layout_hdr = bl_alloc_layout_hdr, 1281 .free_layout_hdr = bl_free_layout_hdr, 1282 .alloc_lseg = bl_alloc_lseg, 1283 .free_lseg = bl_free_lseg, 1284 .encode_layoutcommit = bl_encode_layoutcommit, 1285 .cleanup_layoutcommit = bl_cleanup_layoutcommit, 1286 .set_layoutdriver = bl_set_layoutdriver, 1287 .clear_layoutdriver = bl_clear_layoutdriver, 1288 .pg_read_ops = &bl_pg_read_ops, 1289 .pg_write_ops = &bl_pg_write_ops, 1290 }; 1291 1292 static const struct rpc_pipe_ops bl_upcall_ops = { 1293 .upcall = rpc_pipe_generic_upcall, 1294 .downcall = bl_pipe_downcall, 1295 .destroy_msg = bl_pipe_destroy_msg, 1296 }; 1297 1298 static struct dentry *nfs4blocklayout_register_sb(struct super_block *sb, 1299 struct rpc_pipe *pipe) 1300 { 1301 struct dentry *dir, *dentry; 1302 1303 dir = rpc_d_lookup_sb(sb, NFS_PIPE_DIRNAME); 1304 if (dir == NULL) 1305 return ERR_PTR(-ENOENT); 1306 dentry = rpc_mkpipe_dentry(dir, "blocklayout", NULL, pipe); 1307 dput(dir); 1308 return dentry; 1309 } 1310 1311 static void nfs4blocklayout_unregister_sb(struct super_block *sb, 1312 struct rpc_pipe *pipe) 1313 { 1314 if (pipe->dentry) 1315 rpc_unlink(pipe->dentry); 1316 } 1317 1318 static int rpc_pipefs_event(struct notifier_block *nb, unsigned long event, 1319 void *ptr) 1320 { 1321 struct super_block *sb = ptr; 1322 struct net *net = sb->s_fs_info; 1323 struct nfs_net *nn = net_generic(net, nfs_net_id); 1324 struct dentry *dentry; 1325 int ret = 0; 1326 1327 if (!try_module_get(THIS_MODULE)) 1328 return 0; 1329 1330 if (nn->bl_device_pipe == NULL) { 1331 module_put(THIS_MODULE); 1332 return 0; 1333 } 1334 1335 switch (event) { 1336 case RPC_PIPEFS_MOUNT: 1337 dentry = nfs4blocklayout_register_sb(sb, nn->bl_device_pipe); 1338 if (IS_ERR(dentry)) { 1339 ret = PTR_ERR(dentry); 1340 break; 1341 } 1342 nn->bl_device_pipe->dentry = dentry; 1343 break; 1344 case RPC_PIPEFS_UMOUNT: 1345 if (nn->bl_device_pipe->dentry) 1346 nfs4blocklayout_unregister_sb(sb, nn->bl_device_pipe); 1347 break; 1348 default: 1349 ret = -ENOTSUPP; 1350 break; 1351 } 1352 module_put(THIS_MODULE); 1353 return ret; 1354 } 1355 1356 static struct notifier_block nfs4blocklayout_block = { 1357 .notifier_call = rpc_pipefs_event, 1358 }; 1359 1360 static struct dentry *nfs4blocklayout_register_net(struct net *net, 1361 struct rpc_pipe *pipe) 1362 { 1363 struct super_block *pipefs_sb; 1364 struct dentry *dentry; 1365 1366 pipefs_sb = rpc_get_sb_net(net); 1367 if (!pipefs_sb) 1368 return NULL; 1369 dentry = nfs4blocklayout_register_sb(pipefs_sb, pipe); 1370 rpc_put_sb_net(net); 1371 return dentry; 1372 } 1373 1374 static void nfs4blocklayout_unregister_net(struct net *net, 1375 struct rpc_pipe *pipe) 1376 { 1377 struct super_block *pipefs_sb; 1378 1379 pipefs_sb = rpc_get_sb_net(net); 1380 if (pipefs_sb) { 1381 nfs4blocklayout_unregister_sb(pipefs_sb, pipe); 1382 rpc_put_sb_net(net); 1383 } 1384 } 1385 1386 static int nfs4blocklayout_net_init(struct net *net) 1387 { 1388 struct nfs_net *nn = net_generic(net, nfs_net_id); 1389 struct dentry *dentry; 1390 1391 init_waitqueue_head(&nn->bl_wq); 1392 nn->bl_device_pipe = rpc_mkpipe_data(&bl_upcall_ops, 0); 1393 if (IS_ERR(nn->bl_device_pipe)) 1394 return PTR_ERR(nn->bl_device_pipe); 1395 dentry = nfs4blocklayout_register_net(net, nn->bl_device_pipe); 1396 if (IS_ERR(dentry)) { 1397 rpc_destroy_pipe_data(nn->bl_device_pipe); 1398 return PTR_ERR(dentry); 1399 } 1400 nn->bl_device_pipe->dentry = dentry; 1401 return 0; 1402 } 1403 1404 static void nfs4blocklayout_net_exit(struct net *net) 1405 { 1406 struct nfs_net *nn = net_generic(net, nfs_net_id); 1407 1408 nfs4blocklayout_unregister_net(net, nn->bl_device_pipe); 1409 rpc_destroy_pipe_data(nn->bl_device_pipe); 1410 nn->bl_device_pipe = NULL; 1411 } 1412 1413 static struct pernet_operations nfs4blocklayout_net_ops = { 1414 .init = nfs4blocklayout_net_init, 1415 .exit = nfs4blocklayout_net_exit, 1416 }; 1417 1418 static int __init nfs4blocklayout_init(void) 1419 { 1420 int ret; 1421 1422 dprintk("%s: NFSv4 Block Layout Driver Registering...\n", __func__); 1423 1424 ret = pnfs_register_layoutdriver(&blocklayout_type); 1425 if (ret) 1426 goto out; 1427 1428 ret = rpc_pipefs_notifier_register(&nfs4blocklayout_block); 1429 if (ret) 1430 goto out_remove; 1431 ret = register_pernet_subsys(&nfs4blocklayout_net_ops); 1432 if (ret) 1433 goto out_notifier; 1434 out: 1435 return ret; 1436 1437 out_notifier: 1438 rpc_pipefs_notifier_unregister(&nfs4blocklayout_block); 1439 out_remove: 1440 pnfs_unregister_layoutdriver(&blocklayout_type); 1441 return ret; 1442 } 1443 1444 static void __exit nfs4blocklayout_exit(void) 1445 { 1446 dprintk("%s: NFSv4 Block Layout Driver Unregistering...\n", 1447 __func__); 1448 1449 rpc_pipefs_notifier_unregister(&nfs4blocklayout_block); 1450 unregister_pernet_subsys(&nfs4blocklayout_net_ops); 1451 pnfs_unregister_layoutdriver(&blocklayout_type); 1452 } 1453 1454 MODULE_ALIAS("nfs-layouttype4-3"); 1455 1456 module_init(nfs4blocklayout_init); 1457 module_exit(nfs4blocklayout_exit); 1458