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