1/* -*- mode: c; c-basic-offset: 8; -*- 2 * vim: noexpandtab sw=8 ts=8 sts=0: 3 * 4 * file.c 5 * 6 * File open, close, extend, truncate 7 * 8 * Copyright (C) 2002, 2004 Oracle. All rights reserved. 9 * 10 * This program is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU General Public 12 * License as published by the Free Software Foundation; either 13 * version 2 of the License, or (at your option) any later version. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 18 * General Public License for more details. 19 * 20 * You should have received a copy of the GNU General Public 21 * License along with this program; if not, write to the 22 * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 23 * Boston, MA 021110-1307, USA. 24 */ 25 26#include <linux/capability.h> 27#include <linux/fs.h> 28#include <linux/types.h> 29#include <linux/slab.h> 30#include <linux/highmem.h> 31#include <linux/pagemap.h> 32#include <linux/uio.h> 33#include <linux/sched.h> 34#include <linux/pipe_fs_i.h> 35#include <linux/mount.h> 36#include <linux/writeback.h> 37 38#define MLOG_MASK_PREFIX ML_INODE 39#include <cluster/masklog.h> 40 41#include "ocfs2.h" 42 43#include "alloc.h" 44#include "aops.h" 45#include "dir.h" 46#include "dlmglue.h" 47#include "extent_map.h" 48#include "file.h" 49#include "sysfile.h" 50#include "inode.h" 51#include "ioctl.h" 52#include "journal.h" 53#include "mmap.h" 54#include "suballoc.h" 55#include "super.h" 56 57#include "buffer_head_io.h" 58 59static int ocfs2_sync_inode(struct inode *inode) 60{ 61 filemap_fdatawrite(inode->i_mapping); 62 return sync_mapping_buffers(inode->i_mapping); 63} 64 65static int ocfs2_file_open(struct inode *inode, struct file *file) 66{ 67 int status; 68 int mode = file->f_flags; 69 struct ocfs2_inode_info *oi = OCFS2_I(inode); 70 71 mlog_entry("(0x%p, 0x%p, '%.*s')\n", inode, file, 72 file->f_path.dentry->d_name.len, file->f_path.dentry->d_name.name); 73 74 spin_lock(&oi->ip_lock); 75 76 /* Check that the inode hasn't been wiped from disk by another 77 * node. If it hasn't then we're safe as long as we hold the 78 * spin lock until our increment of open count. */ 79 if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_DELETED) { 80 spin_unlock(&oi->ip_lock); 81 82 status = -ENOENT; 83 goto leave; 84 } 85 86 if (mode & O_DIRECT) 87 oi->ip_flags |= OCFS2_INODE_OPEN_DIRECT; 88 89 oi->ip_open_count++; 90 spin_unlock(&oi->ip_lock); 91 status = 0; 92leave: 93 mlog_exit(status); 94 return status; 95} 96 97static int ocfs2_file_release(struct inode *inode, struct file *file) 98{ 99 struct ocfs2_inode_info *oi = OCFS2_I(inode); 100 101 mlog_entry("(0x%p, 0x%p, '%.*s')\n", inode, file, 102 file->f_path.dentry->d_name.len, 103 file->f_path.dentry->d_name.name); 104 105 spin_lock(&oi->ip_lock); 106 if (!--oi->ip_open_count) 107 oi->ip_flags &= ~OCFS2_INODE_OPEN_DIRECT; 108 spin_unlock(&oi->ip_lock); 109 110 mlog_exit(0); 111 112 return 0; 113} 114 115static int ocfs2_sync_file(struct file *file, 116 struct dentry *dentry, 117 int datasync) 118{ 119 int err = 0; 120 journal_t *journal; 121 struct inode *inode = dentry->d_inode; 122 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 123 124 mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", file, dentry, datasync, 125 dentry->d_name.len, dentry->d_name.name); 126 127 err = ocfs2_sync_inode(dentry->d_inode); 128 if (err) 129 goto bail; 130 131 journal = osb->journal->j_journal; 132 err = journal_force_commit(journal); 133 134bail: 135 mlog_exit(err); 136 137 return (err < 0) ? -EIO : 0; 138} 139 140int ocfs2_should_update_atime(struct inode *inode, 141 struct vfsmount *vfsmnt) 142{ 143 struct timespec now; 144 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 145 146 if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb)) 147 return 0; 148 149 if ((inode->i_flags & S_NOATIME) || 150 ((inode->i_sb->s_flags & MS_NODIRATIME) && S_ISDIR(inode->i_mode))) 151 return 0; 152 153 /* 154 * We can be called with no vfsmnt structure - NFSD will 155 * sometimes do this. 156 * 157 * Note that our action here is different than touch_atime() - 158 * if we can't tell whether this is a noatime mount, then we 159 * don't know whether to trust the value of s_atime_quantum. 160 */ 161 if (vfsmnt == NULL) 162 return 0; 163 164 if ((vfsmnt->mnt_flags & MNT_NOATIME) || 165 ((vfsmnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode))) 166 return 0; 167 168 if (vfsmnt->mnt_flags & MNT_RELATIME) { 169 if ((timespec_compare(&inode->i_atime, &inode->i_mtime) <= 0) || 170 (timespec_compare(&inode->i_atime, &inode->i_ctime) <= 0)) 171 return 1; 172 173 return 0; 174 } 175 176 now = CURRENT_TIME; 177 if ((now.tv_sec - inode->i_atime.tv_sec <= osb->s_atime_quantum)) 178 return 0; 179 else 180 return 1; 181} 182 183int ocfs2_update_inode_atime(struct inode *inode, 184 struct buffer_head *bh) 185{ 186 int ret; 187 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 188 handle_t *handle; 189 190 mlog_entry_void(); 191 192 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS); 193 if (handle == NULL) { 194 ret = -ENOMEM; 195 mlog_errno(ret); 196 goto out; 197 } 198 199 inode->i_atime = CURRENT_TIME; 200 ret = ocfs2_mark_inode_dirty(handle, inode, bh); 201 if (ret < 0) 202 mlog_errno(ret); 203 204 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle); 205out: 206 mlog_exit(ret); 207 return ret; 208} 209 210static int ocfs2_set_inode_size(handle_t *handle, 211 struct inode *inode, 212 struct buffer_head *fe_bh, 213 u64 new_i_size) 214{ 215 int status; 216 217 mlog_entry_void(); 218 i_size_write(inode, new_i_size); 219 inode->i_blocks = ocfs2_inode_sector_count(inode); 220 inode->i_ctime = inode->i_mtime = CURRENT_TIME; 221 222 status = ocfs2_mark_inode_dirty(handle, inode, fe_bh); 223 if (status < 0) { 224 mlog_errno(status); 225 goto bail; 226 } 227 228bail: 229 mlog_exit(status); 230 return status; 231} 232 233static int ocfs2_simple_size_update(struct inode *inode, 234 struct buffer_head *di_bh, 235 u64 new_i_size) 236{ 237 int ret; 238 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 239 handle_t *handle = NULL; 240 241 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS); 242 if (handle == NULL) { 243 ret = -ENOMEM; 244 mlog_errno(ret); 245 goto out; 246 } 247 248 ret = ocfs2_set_inode_size(handle, inode, di_bh, 249 new_i_size); 250 if (ret < 0) 251 mlog_errno(ret); 252 253 ocfs2_commit_trans(osb, handle); 254out: 255 return ret; 256} 257 258static int ocfs2_orphan_for_truncate(struct ocfs2_super *osb, 259 struct inode *inode, 260 struct buffer_head *fe_bh, 261 u64 new_i_size) 262{ 263 int status; 264 handle_t *handle; 265 struct ocfs2_dinode *di; 266 267 mlog_entry_void(); 268 269 /* TODO: This needs to actually orphan the inode in this 270 * transaction. */ 271 272 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS); 273 if (IS_ERR(handle)) { 274 status = PTR_ERR(handle); 275 mlog_errno(status); 276 goto out; 277 } 278 279 status = ocfs2_journal_access(handle, inode, fe_bh, 280 OCFS2_JOURNAL_ACCESS_WRITE); 281 if (status < 0) { 282 mlog_errno(status); 283 goto out_commit; 284 } 285 286 /* 287 * Do this before setting i_size. 288 */ 289 status = ocfs2_zero_tail_for_truncate(inode, handle, new_i_size); 290 if (status) { 291 mlog_errno(status); 292 goto out_commit; 293 } 294 295 i_size_write(inode, new_i_size); 296 inode->i_blocks = ocfs2_align_bytes_to_sectors(new_i_size); 297 inode->i_ctime = inode->i_mtime = CURRENT_TIME; 298 299 di = (struct ocfs2_dinode *) fe_bh->b_data; 300 di->i_size = cpu_to_le64(new_i_size); 301 di->i_ctime = di->i_mtime = cpu_to_le64(inode->i_ctime.tv_sec); 302 di->i_ctime_nsec = di->i_mtime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec); 303 304 status = ocfs2_journal_dirty(handle, fe_bh); 305 if (status < 0) 306 mlog_errno(status); 307 308out_commit: 309 ocfs2_commit_trans(osb, handle); 310out: 311 312 mlog_exit(status); 313 return status; 314} 315 316static int ocfs2_truncate_file(struct inode *inode, 317 struct buffer_head *di_bh, 318 u64 new_i_size) 319{ 320 int status = 0; 321 struct ocfs2_dinode *fe = NULL; 322 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 323 struct ocfs2_truncate_context *tc = NULL; 324 325 mlog_entry("(inode = %llu, new_i_size = %llu\n", 326 (unsigned long long)OCFS2_I(inode)->ip_blkno, 327 (unsigned long long)new_i_size); 328 329 unmap_mapping_range(inode->i_mapping, new_i_size + PAGE_SIZE - 1, 0, 1); 330 truncate_inode_pages(inode->i_mapping, new_i_size); 331 332 fe = (struct ocfs2_dinode *) di_bh->b_data; 333 if (!OCFS2_IS_VALID_DINODE(fe)) { 334 OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, fe); 335 status = -EIO; 336 goto bail; 337 } 338 339 mlog_bug_on_msg(le64_to_cpu(fe->i_size) != i_size_read(inode), 340 "Inode %llu, inode i_size = %lld != di " 341 "i_size = %llu, i_flags = 0x%x\n", 342 (unsigned long long)OCFS2_I(inode)->ip_blkno, 343 i_size_read(inode), 344 (unsigned long long)le64_to_cpu(fe->i_size), 345 le32_to_cpu(fe->i_flags)); 346 347 if (new_i_size > le64_to_cpu(fe->i_size)) { 348 mlog(0, "asked to truncate file with size (%llu) to size (%llu)!\n", 349 (unsigned long long)le64_to_cpu(fe->i_size), 350 (unsigned long long)new_i_size); 351 status = -EINVAL; 352 mlog_errno(status); 353 goto bail; 354 } 355 356 mlog(0, "inode %llu, i_size = %llu, new_i_size = %llu\n", 357 (unsigned long long)le64_to_cpu(fe->i_blkno), 358 (unsigned long long)le64_to_cpu(fe->i_size), 359 (unsigned long long)new_i_size); 360 361 /* lets handle the simple truncate cases before doing any more 362 * cluster locking. */ 363 if (new_i_size == le64_to_cpu(fe->i_size)) 364 goto bail; 365 366 /* This forces other nodes to sync and drop their pages. Do 367 * this even if we have a truncate without allocation change - 368 * ocfs2 cluster sizes can be much greater than page size, so 369 * we have to truncate them anyway. */ 370 status = ocfs2_data_lock(inode, 1); 371 if (status < 0) { 372 mlog_errno(status); 373 goto bail; 374 } 375 376 /* alright, we're going to need to do a full blown alloc size 377 * change. Orphan the inode so that recovery can complete the 378 * truncate if necessary. This does the task of marking 379 * i_size. */ 380 status = ocfs2_orphan_for_truncate(osb, inode, di_bh, new_i_size); 381 if (status < 0) { 382 mlog_errno(status); 383 goto bail_unlock_data; 384 } 385 386 status = ocfs2_prepare_truncate(osb, inode, di_bh, &tc); 387 if (status < 0) { 388 mlog_errno(status); 389 goto bail_unlock_data; 390 } 391 392 status = ocfs2_commit_truncate(osb, inode, di_bh, tc); 393 if (status < 0) { 394 mlog_errno(status); 395 goto bail_unlock_data; 396 } 397 398 /* TODO: orphan dir cleanup here. */ 399bail_unlock_data: 400 ocfs2_data_unlock(inode, 1); 401 402bail: 403 404 mlog_exit(status); 405 return status; 406} 407 408/* 409 * extend allocation only here. 410 * we'll update all the disk stuff, and oip->alloc_size 411 * 412 * expect stuff to be locked, a transaction started and enough data / 413 * metadata reservations in the contexts. 414 * 415 * Will return -EAGAIN, and a reason if a restart is needed. 416 * If passed in, *reason will always be set, even in error. 417 */ 418int ocfs2_do_extend_allocation(struct ocfs2_super *osb, 419 struct inode *inode, 420 u32 *logical_offset, 421 u32 clusters_to_add, 422 struct buffer_head *fe_bh, 423 handle_t *handle, 424 struct ocfs2_alloc_context *data_ac, 425 struct ocfs2_alloc_context *meta_ac, 426 enum ocfs2_alloc_restarted *reason_ret) 427{ 428 int status = 0; 429 int free_extents; 430 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) fe_bh->b_data; 431 enum ocfs2_alloc_restarted reason = RESTART_NONE; 432 u32 bit_off, num_bits; 433 u64 block; 434 435 BUG_ON(!clusters_to_add); 436 437 free_extents = ocfs2_num_free_extents(osb, inode, fe); 438 if (free_extents < 0) { 439 status = free_extents; 440 mlog_errno(status); 441 goto leave; 442 } 443 444 /* there are two cases which could cause us to EAGAIN in the 445 * we-need-more-metadata case: 446 * 1) we haven't reserved *any* 447 * 2) we are so fragmented, we've needed to add metadata too 448 * many times. */ 449 if (!free_extents && !meta_ac) { 450 mlog(0, "we haven't reserved any metadata!\n"); 451 status = -EAGAIN; 452 reason = RESTART_META; 453 goto leave; 454 } else if ((!free_extents) 455 && (ocfs2_alloc_context_bits_left(meta_ac) 456 < ocfs2_extend_meta_needed(fe))) { 457 mlog(0, "filesystem is really fragmented...\n"); 458 status = -EAGAIN; 459 reason = RESTART_META; 460 goto leave; 461 } 462 463 status = ocfs2_claim_clusters(osb, handle, data_ac, 1, 464 &bit_off, &num_bits); 465 if (status < 0) { 466 if (status != -ENOSPC) 467 mlog_errno(status); 468 goto leave; 469 } 470 471 BUG_ON(num_bits > clusters_to_add); 472 473 /* reserve our write early -- insert_extent may update the inode */ 474 status = ocfs2_journal_access(handle, inode, fe_bh, 475 OCFS2_JOURNAL_ACCESS_WRITE); 476 if (status < 0) { 477 mlog_errno(status); 478 goto leave; 479 } 480 481 block = ocfs2_clusters_to_blocks(osb->sb, bit_off); 482 mlog(0, "Allocating %u clusters at block %u for inode %llu\n", 483 num_bits, bit_off, (unsigned long long)OCFS2_I(inode)->ip_blkno); 484 status = ocfs2_insert_extent(osb, handle, inode, fe_bh, 485 *logical_offset, block, num_bits, 486 meta_ac); 487 if (status < 0) { 488 mlog_errno(status); 489 goto leave; 490 } 491 492 status = ocfs2_journal_dirty(handle, fe_bh); 493 if (status < 0) { 494 mlog_errno(status); 495 goto leave; 496 } 497 498 clusters_to_add -= num_bits; 499 *logical_offset += num_bits; 500 501 if (clusters_to_add) { 502 mlog(0, "need to alloc once more, clusters = %u, wanted = " 503 "%u\n", fe->i_clusters, clusters_to_add); 504 status = -EAGAIN; 505 reason = RESTART_TRANS; 506 } 507 508leave: 509 mlog_exit(status); 510 if (reason_ret) 511 *reason_ret = reason; 512 return status; 513} 514 515/* 516 * For a given allocation, determine which allocators will need to be 517 * accessed, and lock them, reserving the appropriate number of bits. 518 * 519 * Called from ocfs2_extend_allocation() for file systems which don't 520 * support holes, and from ocfs2_write() for file systems which 521 * understand sparse inodes. 522 */ 523int ocfs2_lock_allocators(struct inode *inode, struct ocfs2_dinode *di, 524 u32 clusters_to_add, 525 struct ocfs2_alloc_context **data_ac, 526 struct ocfs2_alloc_context **meta_ac) 527{ 528 int ret, num_free_extents; 529 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 530 531 *meta_ac = NULL; 532 *data_ac = NULL; 533 534 mlog(0, "extend inode %llu, i_size = %lld, di->i_clusters = %u, " 535 "clusters_to_add = %u\n", 536 (unsigned long long)OCFS2_I(inode)->ip_blkno, i_size_read(inode), 537 le32_to_cpu(di->i_clusters), clusters_to_add); 538 539 num_free_extents = ocfs2_num_free_extents(osb, inode, di); 540 if (num_free_extents < 0) { 541 ret = num_free_extents; 542 mlog_errno(ret); 543 goto out; 544 } 545 546 /* 547 * Sparse allocation file systems need to be more conservative 548 * with reserving room for expansion - the actual allocation 549 * happens while we've got a journal handle open so re-taking 550 * a cluster lock (because we ran out of room for another 551 * extent) will violate ordering rules. 552 * 553 * Most of the time we'll only be seeing this 1 cluster at a time 554 * anyway. 555 */ 556 if (!num_free_extents || 557 (ocfs2_sparse_alloc(osb) && num_free_extents < clusters_to_add)) { 558 ret = ocfs2_reserve_new_metadata(osb, di, meta_ac); 559 if (ret < 0) { 560 if (ret != -ENOSPC) 561 mlog_errno(ret); 562 goto out; 563 } 564 } 565 566 ret = ocfs2_reserve_clusters(osb, clusters_to_add, data_ac); 567 if (ret < 0) { 568 if (ret != -ENOSPC) 569 mlog_errno(ret); 570 goto out; 571 } 572 573out: 574 if (ret) { 575 if (*meta_ac) { 576 ocfs2_free_alloc_context(*meta_ac); 577 *meta_ac = NULL; 578 } 579 580 /* 581 * We cannot have an error and a non null *data_ac. 582 */ 583 } 584 585 return ret; 586} 587 588static int ocfs2_extend_allocation(struct inode *inode, 589 u32 clusters_to_add) 590{ 591 int status = 0; 592 int restart_func = 0; 593 int drop_alloc_sem = 0; 594 int credits; 595 u32 prev_clusters, logical_start; 596 struct buffer_head *bh = NULL; 597 struct ocfs2_dinode *fe = NULL; 598 handle_t *handle = NULL; 599 struct ocfs2_alloc_context *data_ac = NULL; 600 struct ocfs2_alloc_context *meta_ac = NULL; 601 enum ocfs2_alloc_restarted why; 602 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 603 604 mlog_entry("(clusters_to_add = %u)\n", clusters_to_add); 605 606 /* 607 * This function only exists for file systems which don't 608 * support holes. 609 */ 610 BUG_ON(ocfs2_sparse_alloc(osb)); 611 612 status = ocfs2_read_block(osb, OCFS2_I(inode)->ip_blkno, &bh, 613 OCFS2_BH_CACHED, inode); 614 if (status < 0) { 615 mlog_errno(status); 616 goto leave; 617 } 618 619 fe = (struct ocfs2_dinode *) bh->b_data; 620 if (!OCFS2_IS_VALID_DINODE(fe)) { 621 OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, fe); 622 status = -EIO; 623 goto leave; 624 } 625 626 logical_start = OCFS2_I(inode)->ip_clusters; 627 628restart_all: 629 BUG_ON(le32_to_cpu(fe->i_clusters) != OCFS2_I(inode)->ip_clusters); 630 631 /* blocks peope in read/write from reading our allocation 632 * until we're done changing it. We depend on i_mutex to block 633 * other extend/truncate calls while we're here. Ordering wrt 634 * start_trans is important here -- always do it before! */ 635 down_write(&OCFS2_I(inode)->ip_alloc_sem); 636 drop_alloc_sem = 1; 637 638 status = ocfs2_lock_allocators(inode, fe, clusters_to_add, &data_ac, 639 &meta_ac); 640 if (status) { 641 mlog_errno(status); 642 goto leave; 643 } 644 645 credits = ocfs2_calc_extend_credits(osb->sb, fe, clusters_to_add); 646 handle = ocfs2_start_trans(osb, credits); 647 if (IS_ERR(handle)) { 648 status = PTR_ERR(handle); 649 handle = NULL; 650 mlog_errno(status); 651 goto leave; 652 } 653 654restarted_transaction: 655 /* reserve a write to the file entry early on - that we if we 656 * run out of credits in the allocation path, we can still 657 * update i_size. */ 658 status = ocfs2_journal_access(handle, inode, bh, 659 OCFS2_JOURNAL_ACCESS_WRITE); 660 if (status < 0) { 661 mlog_errno(status); 662 goto leave; 663 } 664 665 prev_clusters = OCFS2_I(inode)->ip_clusters; 666 667 status = ocfs2_do_extend_allocation(osb, 668 inode, 669 &logical_start, 670 clusters_to_add, 671 bh, 672 handle, 673 data_ac, 674 meta_ac, 675 &why); 676 if ((status < 0) && (status != -EAGAIN)) { 677 if (status != -ENOSPC) 678 mlog_errno(status); 679 goto leave; 680 } 681 682 status = ocfs2_journal_dirty(handle, bh); 683 if (status < 0) { 684 mlog_errno(status); 685 goto leave; 686 } 687 688 spin_lock(&OCFS2_I(inode)->ip_lock); 689 clusters_to_add -= (OCFS2_I(inode)->ip_clusters - prev_clusters); 690 spin_unlock(&OCFS2_I(inode)->ip_lock); 691 692 if (why != RESTART_NONE && clusters_to_add) { 693 if (why == RESTART_META) { 694 mlog(0, "restarting function.\n"); 695 restart_func = 1; 696 } else { 697 BUG_ON(why != RESTART_TRANS); 698 699 mlog(0, "restarting transaction.\n"); 700 /* TODO: This can be more intelligent. */ 701 credits = ocfs2_calc_extend_credits(osb->sb, 702 fe, 703 clusters_to_add); 704 status = ocfs2_extend_trans(handle, credits); 705 if (status < 0) { 706 /* handle still has to be committed at 707 * this point. */ 708 status = -ENOMEM; 709 mlog_errno(status); 710 goto leave; 711 } 712 goto restarted_transaction; 713 } 714 } 715 716 mlog(0, "fe: i_clusters = %u, i_size=%llu\n", 717 le32_to_cpu(fe->i_clusters), 718 (unsigned long long)le64_to_cpu(fe->i_size)); 719 mlog(0, "inode: ip_clusters=%u, i_size=%lld\n", 720 OCFS2_I(inode)->ip_clusters, i_size_read(inode)); 721 722leave: 723 if (drop_alloc_sem) { 724 up_write(&OCFS2_I(inode)->ip_alloc_sem); 725 drop_alloc_sem = 0; 726 } 727 if (handle) { 728 ocfs2_commit_trans(osb, handle); 729 handle = NULL; 730 } 731 if (data_ac) { 732 ocfs2_free_alloc_context(data_ac); 733 data_ac = NULL; 734 } 735 if (meta_ac) { 736 ocfs2_free_alloc_context(meta_ac); 737 meta_ac = NULL; 738 } 739 if ((!status) && restart_func) { 740 restart_func = 0; 741 goto restart_all; 742 } 743 if (bh) { 744 brelse(bh); 745 bh = NULL; 746 } 747 748 mlog_exit(status); 749 return status; 750} 751 752/* Some parts of this taken from generic_cont_expand, which turned out 753 * to be too fragile to do exactly what we need without us having to 754 * worry about recursive locking in ->prepare_write() and 755 * ->commit_write(). */ 756static int ocfs2_write_zero_page(struct inode *inode, 757 u64 size) 758{ 759 struct address_space *mapping = inode->i_mapping; 760 struct page *page; 761 unsigned long index; 762 unsigned int offset; 763 handle_t *handle = NULL; 764 int ret; 765 766 offset = (size & (PAGE_CACHE_SIZE-1)); /* Within page */ 767 /* ugh. in prepare/commit_write, if from==to==start of block, we 768 ** skip the prepare. make sure we never send an offset for the start 769 ** of a block 770 */ 771 if ((offset & (inode->i_sb->s_blocksize - 1)) == 0) { 772 offset++; 773 } 774 index = size >> PAGE_CACHE_SHIFT; 775 776 page = grab_cache_page(mapping, index); 777 if (!page) { 778 ret = -ENOMEM; 779 mlog_errno(ret); 780 goto out; 781 } 782 783 ret = ocfs2_prepare_write_nolock(inode, page, offset, offset); 784 if (ret < 0) { 785 mlog_errno(ret); 786 goto out_unlock; 787 } 788 789 if (ocfs2_should_order_data(inode)) { 790 handle = ocfs2_start_walk_page_trans(inode, page, offset, 791 offset); 792 if (IS_ERR(handle)) { 793 ret = PTR_ERR(handle); 794 handle = NULL; 795 goto out_unlock; 796 } 797 } 798 799 /* must not update i_size! */ 800 ret = block_commit_write(page, offset, offset); 801 if (ret < 0) 802 mlog_errno(ret); 803 else 804 ret = 0; 805 806 if (handle) 807 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle); 808out_unlock: 809 unlock_page(page); 810 page_cache_release(page); 811out: 812 return ret; 813} 814 815static int ocfs2_zero_extend(struct inode *inode, 816 u64 zero_to_size) 817{ 818 int ret = 0; 819 u64 start_off; 820 struct super_block *sb = inode->i_sb; 821 822 start_off = ocfs2_align_bytes_to_blocks(sb, i_size_read(inode)); 823 while (start_off < zero_to_size) { 824 ret = ocfs2_write_zero_page(inode, start_off); 825 if (ret < 0) { 826 mlog_errno(ret); 827 goto out; 828 } 829 830 start_off += sb->s_blocksize; 831 832 /* 833 * Very large extends have the potential to lock up 834 * the cpu for extended periods of time. 835 */ 836 cond_resched(); 837 } 838 839out: 840 return ret; 841} 842 843/* 844 * A tail_to_skip value > 0 indicates that we're being called from 845 * ocfs2_file_aio_write(). This has the following implications: 846 * 847 * - we don't want to update i_size 848 * - di_bh will be NULL, which is fine because it's only used in the 849 * case where we want to update i_size. 850 * - ocfs2_zero_extend() will then only be filling the hole created 851 * between i_size and the start of the write. 852 */ 853static int ocfs2_extend_file(struct inode *inode, 854 struct buffer_head *di_bh, 855 u64 new_i_size, 856 size_t tail_to_skip) 857{ 858 int ret = 0; 859 u32 clusters_to_add = 0; 860 861 BUG_ON(!tail_to_skip && !di_bh); 862 863 /* setattr sometimes calls us like this. */ 864 if (new_i_size == 0) 865 goto out; 866 867 if (i_size_read(inode) == new_i_size) 868 goto out; 869 BUG_ON(new_i_size < i_size_read(inode)); 870 871 if (ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb))) { 872 BUG_ON(tail_to_skip != 0); 873 goto out_update_size; 874 } 875 876 clusters_to_add = ocfs2_clusters_for_bytes(inode->i_sb, new_i_size) - 877 OCFS2_I(inode)->ip_clusters; 878 879 /* 880 * protect the pages that ocfs2_zero_extend is going to be 881 * pulling into the page cache.. we do this before the 882 * metadata extend so that we don't get into the situation 883 * where we've extended the metadata but can't get the data 884 * lock to zero. 885 */ 886 ret = ocfs2_data_lock(inode, 1); 887 if (ret < 0) { 888 mlog_errno(ret); 889 goto out; 890 } 891 892 if (clusters_to_add) { 893 ret = ocfs2_extend_allocation(inode, clusters_to_add); 894 if (ret < 0) { 895 mlog_errno(ret); 896 goto out_unlock; 897 } 898 } 899 900 /* 901 * Call this even if we don't add any clusters to the tree. We 902 * still need to zero the area between the old i_size and the 903 * new i_size. 904 */ 905 ret = ocfs2_zero_extend(inode, (u64)new_i_size - tail_to_skip); 906 if (ret < 0) { 907 mlog_errno(ret); 908 goto out_unlock; 909 } 910 911out_update_size: 912 if (!tail_to_skip) { 913 /* We're being called from ocfs2_setattr() which wants 914 * us to update i_size */ 915 ret = ocfs2_simple_size_update(inode, di_bh, new_i_size); 916 if (ret < 0) 917 mlog_errno(ret); 918 } 919 920out_unlock: 921 if (!ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb))) 922 ocfs2_data_unlock(inode, 1); 923 924out: 925 return ret; 926} 927 928int ocfs2_setattr(struct dentry *dentry, struct iattr *attr) 929{ 930 int status = 0, size_change; 931 struct inode *inode = dentry->d_inode; 932 struct super_block *sb = inode->i_sb; 933 struct ocfs2_super *osb = OCFS2_SB(sb); 934 struct buffer_head *bh = NULL; 935 handle_t *handle = NULL; 936 937 mlog_entry("(0x%p, '%.*s')\n", dentry, 938 dentry->d_name.len, dentry->d_name.name); 939 940 if (attr->ia_valid & ATTR_MODE) 941 mlog(0, "mode change: %d\n", attr->ia_mode); 942 if (attr->ia_valid & ATTR_UID) 943 mlog(0, "uid change: %d\n", attr->ia_uid); 944 if (attr->ia_valid & ATTR_GID) 945 mlog(0, "gid change: %d\n", attr->ia_gid); 946 if (attr->ia_valid & ATTR_SIZE) 947 mlog(0, "size change...\n"); 948 if (attr->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_CTIME)) 949 mlog(0, "time change...\n"); 950 951#define OCFS2_VALID_ATTRS (ATTR_ATIME | ATTR_MTIME | ATTR_CTIME | ATTR_SIZE \ 952 | ATTR_GID | ATTR_UID | ATTR_MODE) 953 if (!(attr->ia_valid & OCFS2_VALID_ATTRS)) { 954 mlog(0, "can't handle attrs: 0x%x\n", attr->ia_valid); 955 return 0; 956 } 957 958 status = inode_change_ok(inode, attr); 959 if (status) 960 return status; 961 962 size_change = S_ISREG(inode->i_mode) && attr->ia_valid & ATTR_SIZE; 963 if (size_change) { 964 status = ocfs2_rw_lock(inode, 1); 965 if (status < 0) { 966 mlog_errno(status); 967 goto bail; 968 } 969 } 970 971 status = ocfs2_meta_lock(inode, &bh, 1); 972 if (status < 0) { 973 if (status != -ENOENT) 974 mlog_errno(status); 975 goto bail_unlock_rw; 976 } 977 978 if (size_change && attr->ia_size != i_size_read(inode)) { 979 if (i_size_read(inode) > attr->ia_size) 980 status = ocfs2_truncate_file(inode, bh, attr->ia_size); 981 else 982 status = ocfs2_extend_file(inode, bh, attr->ia_size, 0); 983 if (status < 0) { 984 if (status != -ENOSPC) 985 mlog_errno(status); 986 status = -ENOSPC; 987 goto bail_unlock; 988 } 989 } 990 991 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS); 992 if (IS_ERR(handle)) { 993 status = PTR_ERR(handle); 994 mlog_errno(status); 995 goto bail_unlock; 996 } 997 998 status = inode_setattr(inode, attr); 999 if (status < 0) { 1000 mlog_errno(status); 1001 goto bail_commit; 1002 } 1003 1004 status = ocfs2_mark_inode_dirty(handle, inode, bh); 1005 if (status < 0) 1006 mlog_errno(status); 1007 1008bail_commit: 1009 ocfs2_commit_trans(osb, handle); 1010bail_unlock: 1011 ocfs2_meta_unlock(inode, 1); 1012bail_unlock_rw: 1013 if (size_change) 1014 ocfs2_rw_unlock(inode, 1); 1015bail: 1016 if (bh) 1017 brelse(bh); 1018 1019 mlog_exit(status); 1020 return status; 1021} 1022 1023int ocfs2_getattr(struct vfsmount *mnt, 1024 struct dentry *dentry, 1025 struct kstat *stat) 1026{ 1027 struct inode *inode = dentry->d_inode; 1028 struct super_block *sb = dentry->d_inode->i_sb; 1029 struct ocfs2_super *osb = sb->s_fs_info; 1030 int err; 1031 1032 mlog_entry_void(); 1033 1034 err = ocfs2_inode_revalidate(dentry); 1035 if (err) { 1036 if (err != -ENOENT) 1037 mlog_errno(err); 1038 goto bail; 1039 } 1040 1041 generic_fillattr(inode, stat); 1042 1043 /* We set the blksize from the cluster size for performance */ 1044 stat->blksize = osb->s_clustersize; 1045 1046bail: 1047 mlog_exit(err); 1048 1049 return err; 1050} 1051 1052int ocfs2_permission(struct inode *inode, int mask, struct nameidata *nd) 1053{ 1054 int ret; 1055 1056 mlog_entry_void(); 1057 1058 ret = ocfs2_meta_lock(inode, NULL, 0); 1059 if (ret) { 1060 if (ret != -ENOENT) 1061 mlog_errno(ret); 1062 goto out; 1063 } 1064 1065 ret = generic_permission(inode, mask, NULL); 1066 1067 ocfs2_meta_unlock(inode, 0); 1068out: 1069 mlog_exit(ret); 1070 return ret; 1071} 1072 1073static int ocfs2_write_remove_suid(struct inode *inode) 1074{ 1075 int ret; 1076 struct buffer_head *bh = NULL; 1077 struct ocfs2_inode_info *oi = OCFS2_I(inode); 1078 handle_t *handle; 1079 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 1080 struct ocfs2_dinode *di; 1081 1082 mlog_entry("(Inode %llu, mode 0%o)\n", 1083 (unsigned long long)oi->ip_blkno, inode->i_mode); 1084 1085 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS); 1086 if (handle == NULL) { 1087 ret = -ENOMEM; 1088 mlog_errno(ret); 1089 goto out; 1090 } 1091 1092 ret = ocfs2_read_block(osb, oi->ip_blkno, &bh, OCFS2_BH_CACHED, inode); 1093 if (ret < 0) { 1094 mlog_errno(ret); 1095 goto out_trans; 1096 } 1097 1098 ret = ocfs2_journal_access(handle, inode, bh, 1099 OCFS2_JOURNAL_ACCESS_WRITE); 1100 if (ret < 0) { 1101 mlog_errno(ret); 1102 goto out_bh; 1103 } 1104 1105 inode->i_mode &= ~S_ISUID; 1106 if ((inode->i_mode & S_ISGID) && (inode->i_mode & S_IXGRP)) 1107 inode->i_mode &= ~S_ISGID; 1108 1109 di = (struct ocfs2_dinode *) bh->b_data; 1110 di->i_mode = cpu_to_le16(inode->i_mode); 1111 1112 ret = ocfs2_journal_dirty(handle, bh); 1113 if (ret < 0) 1114 mlog_errno(ret); 1115out_bh: 1116 brelse(bh); 1117out_trans: 1118 ocfs2_commit_trans(osb, handle); 1119out: 1120 mlog_exit(ret); 1121 return ret; 1122} 1123 1124/* 1125 * Will look for holes and unwritten extents in the range starting at 1126 * pos for count bytes (inclusive). 1127 */ 1128static int ocfs2_check_range_for_holes(struct inode *inode, loff_t pos, 1129 size_t count) 1130{ 1131 int ret = 0; 1132 unsigned int extent_flags; 1133 u32 cpos, clusters, extent_len, phys_cpos; 1134 struct super_block *sb = inode->i_sb; 1135 1136 cpos = pos >> OCFS2_SB(sb)->s_clustersize_bits; 1137 clusters = ocfs2_clusters_for_bytes(sb, pos + count) - cpos; 1138 1139 while (clusters) { 1140 ret = ocfs2_get_clusters(inode, cpos, &phys_cpos, &extent_len, 1141 &extent_flags); 1142 if (ret < 0) { 1143 mlog_errno(ret); 1144 goto out; 1145 } 1146 1147 if (phys_cpos == 0 || (extent_flags & OCFS2_EXT_UNWRITTEN)) { 1148 ret = 1; 1149 break; 1150 } 1151 1152 if (extent_len > clusters) 1153 extent_len = clusters; 1154 1155 clusters -= extent_len; 1156 cpos += extent_len; 1157 } 1158out: 1159 return ret; 1160} 1161 1162static int ocfs2_prepare_inode_for_write(struct dentry *dentry, 1163 loff_t *ppos, 1164 size_t count, 1165 int appending, 1166 int *direct_io) 1167{ 1168 int ret = 0, meta_level = appending; 1169 struct inode *inode = dentry->d_inode; 1170 u32 clusters; 1171 loff_t newsize, saved_pos; 1172 1173 /* 1174 * We sample i_size under a read level meta lock to see if our write 1175 * is extending the file, if it is we back off and get a write level 1176 * meta lock. 1177 */ 1178 for(;;) { 1179 ret = ocfs2_meta_lock(inode, NULL, meta_level); 1180 if (ret < 0) { 1181 meta_level = -1; 1182 mlog_errno(ret); 1183 goto out; 1184 } 1185 1186 /* Clear suid / sgid if necessary. We do this here 1187 * instead of later in the write path because 1188 * remove_suid() calls ->setattr without any hint that 1189 * we may have already done our cluster locking. Since 1190 * ocfs2_setattr() *must* take cluster locks to 1191 * proceeed, this will lead us to recursively lock the 1192 * inode. There's also the dinode i_size state which 1193 * can be lost via setattr during extending writes (we 1194 * set inode->i_size at the end of a write. */ 1195 if (should_remove_suid(dentry)) { 1196 if (meta_level == 0) { 1197 ocfs2_meta_unlock(inode, meta_level); 1198 meta_level = 1; 1199 continue; 1200 } 1201 1202 ret = ocfs2_write_remove_suid(inode); 1203 if (ret < 0) { 1204 mlog_errno(ret); 1205 goto out_unlock; 1206 } 1207 } 1208 1209 /* work on a copy of ppos until we're sure that we won't have 1210 * to recalculate it due to relocking. */ 1211 if (appending) { 1212 saved_pos = i_size_read(inode); 1213 mlog(0, "O_APPEND: inode->i_size=%llu\n", saved_pos); 1214 } else { 1215 saved_pos = *ppos; 1216 } 1217 1218 if (ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb))) { 1219 loff_t end = saved_pos + count; 1220 1221 /* 1222 * Skip the O_DIRECT checks if we don't need 1223 * them. 1224 */ 1225 if (!direct_io || !(*direct_io)) 1226 break; 1227 1228 /* 1229 * Allowing concurrent direct writes means 1230 * i_size changes wouldn't be synchronized, so 1231 * one node could wind up truncating another 1232 * nodes writes. 1233 */ 1234 if (end > i_size_read(inode)) { 1235 *direct_io = 0; 1236 break; 1237 } 1238 1239 /* 1240 * We don't fill holes during direct io, so 1241 * check for them here. If any are found, the 1242 * caller will have to retake some cluster 1243 * locks and initiate the io as buffered. 1244 */ 1245 ret = ocfs2_check_range_for_holes(inode, saved_pos, 1246 count); 1247 if (ret == 1) { 1248 *direct_io = 0; 1249 ret = 0; 1250 } else if (ret < 0) 1251 mlog_errno(ret); 1252 break; 1253 } 1254 1255 /* 1256 * The rest of this loop is concerned with legacy file 1257 * systems which don't support sparse files. 1258 */ 1259 1260 newsize = count + saved_pos; 1261 1262 mlog(0, "pos=%lld newsize=%lld cursize=%lld\n", 1263 (long long) saved_pos, (long long) newsize, 1264 (long long) i_size_read(inode)); 1265 1266 /* No need for a higher level metadata lock if we're 1267 * never going past i_size. */ 1268 if (newsize <= i_size_read(inode)) 1269 break; 1270 1271 if (meta_level == 0) { 1272 ocfs2_meta_unlock(inode, meta_level); 1273 meta_level = 1; 1274 continue; 1275 } 1276 1277 spin_lock(&OCFS2_I(inode)->ip_lock); 1278 clusters = ocfs2_clusters_for_bytes(inode->i_sb, newsize) - 1279 OCFS2_I(inode)->ip_clusters; 1280 spin_unlock(&OCFS2_I(inode)->ip_lock); 1281 1282 mlog(0, "Writing at EOF, may need more allocation: " 1283 "i_size = %lld, newsize = %lld, need %u clusters\n", 1284 (long long) i_size_read(inode), (long long) newsize, 1285 clusters); 1286 1287 /* We only want to continue the rest of this loop if 1288 * our extend will actually require more 1289 * allocation. */ 1290 if (!clusters) 1291 break; 1292 1293 ret = ocfs2_extend_file(inode, NULL, newsize, count); 1294 if (ret < 0) { 1295 if (ret != -ENOSPC) 1296 mlog_errno(ret); 1297 goto out_unlock; 1298 } 1299 break; 1300 } 1301 1302 if (appending) 1303 *ppos = saved_pos; 1304 1305out_unlock: 1306 ocfs2_meta_unlock(inode, meta_level); 1307 1308out: 1309 return ret; 1310} 1311 1312static inline void 1313ocfs2_set_next_iovec(const struct iovec **iovp, size_t *basep, size_t bytes) 1314{ 1315 const struct iovec *iov = *iovp; 1316 size_t base = *basep; 1317 1318 do { 1319 int copy = min(bytes, iov->iov_len - base); 1320 1321 bytes -= copy; 1322 base += copy; 1323 if (iov->iov_len == base) { 1324 iov++; 1325 base = 0; 1326 } 1327 } while (bytes); 1328 *iovp = iov; 1329 *basep = base; 1330} 1331 1332static struct page * ocfs2_get_write_source(struct ocfs2_buffered_write_priv *bp, 1333 const struct iovec *cur_iov, 1334 size_t iov_offset) 1335{ 1336 int ret; 1337 char *buf; 1338 struct page *src_page = NULL; 1339 1340 buf = cur_iov->iov_base + iov_offset; 1341 1342 if (!segment_eq(get_fs(), KERNEL_DS)) { 1343 /* 1344 * Pull in the user page. We want to do this outside 1345 * of the meta data locks in order to preserve locking 1346 * order in case of page fault. 1347 */ 1348 ret = get_user_pages(current, current->mm, 1349 (unsigned long)buf & PAGE_CACHE_MASK, 1, 1350 0, 0, &src_page, NULL); 1351 if (ret == 1) 1352 bp->b_src_buf = kmap(src_page); 1353 else 1354 src_page = ERR_PTR(-EFAULT); 1355 } else { 1356 bp->b_src_buf = buf; 1357 } 1358 1359 return src_page; 1360} 1361 1362static void ocfs2_put_write_source(struct ocfs2_buffered_write_priv *bp, 1363 struct page *page) 1364{ 1365 if (page) { 1366 kunmap(page); 1367 page_cache_release(page); 1368 } 1369} 1370 1371static ssize_t ocfs2_file_buffered_write(struct file *file, loff_t *ppos, 1372 const struct iovec *iov, 1373 unsigned long nr_segs, 1374 size_t count, 1375 ssize_t o_direct_written) 1376{ 1377 int ret = 0; 1378 ssize_t copied, total = 0; 1379 size_t iov_offset = 0; 1380 const struct iovec *cur_iov = iov; 1381 struct ocfs2_buffered_write_priv bp; 1382 struct page *page; 1383 1384 /* 1385 * handle partial DIO write. Adjust cur_iov if needed. 1386 */ 1387 ocfs2_set_next_iovec(&cur_iov, &iov_offset, o_direct_written); 1388 1389 do { 1390 bp.b_cur_off = iov_offset; 1391 bp.b_cur_iov = cur_iov; 1392 1393 page = ocfs2_get_write_source(&bp, cur_iov, iov_offset); 1394 if (IS_ERR(page)) { 1395 ret = PTR_ERR(page); 1396 goto out; 1397 } 1398 1399 copied = ocfs2_buffered_write_cluster(file, *ppos, count, 1400 ocfs2_map_and_write_user_data, 1401 &bp); 1402 1403 ocfs2_put_write_source(&bp, page); 1404 1405 if (copied < 0) { 1406 mlog_errno(copied); 1407 ret = copied; 1408 goto out; 1409 } 1410 1411 total += copied; 1412 *ppos = *ppos + copied; 1413 count -= copied; 1414 1415 ocfs2_set_next_iovec(&cur_iov, &iov_offset, copied); 1416 } while(count); 1417 1418out: 1419 return total ? total : ret; 1420} 1421 1422static ssize_t ocfs2_file_aio_write(struct kiocb *iocb, 1423 const struct iovec *iov, 1424 unsigned long nr_segs, 1425 loff_t pos) 1426{ 1427 int ret, direct_io, appending, rw_level, have_alloc_sem = 0; 1428 int can_do_direct, sync = 0; 1429 ssize_t written = 0; 1430 size_t ocount; /* original count */ 1431 size_t count; /* after file limit checks */ 1432 loff_t *ppos = &iocb->ki_pos; 1433 struct file *file = iocb->ki_filp; 1434 struct inode *inode = file->f_path.dentry->d_inode; 1435 1436 mlog_entry("(0x%p, %u, '%.*s')\n", file, 1437 (unsigned int)nr_segs, 1438 file->f_path.dentry->d_name.len, 1439 file->f_path.dentry->d_name.name); 1440 1441 if (iocb->ki_left == 0) 1442 return 0; 1443 1444 ret = generic_segment_checks(iov, &nr_segs, &ocount, VERIFY_READ); 1445 if (ret) 1446 return ret; 1447 1448 count = ocount; 1449 1450 vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE); 1451 1452 appending = file->f_flags & O_APPEND ? 1 : 0; 1453 direct_io = file->f_flags & O_DIRECT ? 1 : 0; 1454 1455 mutex_lock(&inode->i_mutex); 1456 1457relock: 1458 /* to match setattr's i_mutex -> i_alloc_sem -> rw_lock ordering */ 1459 if (direct_io) { 1460 down_read(&inode->i_alloc_sem); 1461 have_alloc_sem = 1; 1462 } 1463 1464 /* concurrent O_DIRECT writes are allowed */ 1465 rw_level = !direct_io; 1466 ret = ocfs2_rw_lock(inode, rw_level); 1467 if (ret < 0) { 1468 mlog_errno(ret); 1469 goto out_sems; 1470 } 1471 1472 can_do_direct = direct_io; 1473 ret = ocfs2_prepare_inode_for_write(file->f_path.dentry, ppos, 1474 iocb->ki_left, appending, 1475 &can_do_direct); 1476 if (ret < 0) { 1477 mlog_errno(ret); 1478 goto out; 1479 } 1480 1481 /* 1482 * We can't complete the direct I/O as requested, fall back to 1483 * buffered I/O. 1484 */ 1485 if (direct_io && !can_do_direct) { 1486 ocfs2_rw_unlock(inode, rw_level); 1487 up_read(&inode->i_alloc_sem); 1488 1489 have_alloc_sem = 0; 1490 rw_level = -1; 1491 1492 direct_io = 0; 1493 sync = 1; 1494 goto relock; 1495 } 1496 1497 if (!sync && ((file->f_flags & O_SYNC) || IS_SYNC(inode))) 1498 sync = 1; 1499 1500 ret = generic_write_checks(file, ppos, &count, S_ISBLK(inode->i_mode)); 1501 if (ret) 1502 goto out; 1503 1504 /* 1505 * Set pos so that sync_page_range_nolock() below understands 1506 * where to start from. We might've moved it around via the 1507 * calls above. The range we want to actually sync starts from 1508 * *ppos here. 1509 * 1510 */ 1511 pos = *ppos; 1512 1513 /* communicate with ocfs2_dio_end_io */ 1514 ocfs2_iocb_set_rw_locked(iocb, rw_level); 1515 1516 if (direct_io) { 1517 written = generic_file_direct_write(iocb, iov, &nr_segs, *ppos, 1518 ppos, count, ocount); 1519 if (written < 0) { 1520 ret = written; 1521 goto out_dio; 1522 } 1523 } else { 1524 written = ocfs2_file_buffered_write(file, ppos, iov, nr_segs, 1525 count, written); 1526 if (written < 0) { 1527 ret = written; 1528 if (ret != -EFAULT || ret != -ENOSPC) 1529 mlog_errno(ret); 1530 goto out; 1531 } 1532 } 1533 1534out_dio: 1535 /* buffered aio wouldn't have proper lock coverage today */ 1536 BUG_ON(ret == -EIOCBQUEUED && !(file->f_flags & O_DIRECT)); 1537 1538 /* 1539 * deep in g_f_a_w_n()->ocfs2_direct_IO we pass in a ocfs2_dio_end_io 1540 * function pointer which is called when o_direct io completes so that 1541 * it can unlock our rw lock. (it's the clustered equivalent of 1542 * i_alloc_sem; protects truncate from racing with pending ios). 1543 * Unfortunately there are error cases which call end_io and others 1544 * that don't. so we don't have to unlock the rw_lock if either an 1545 * async dio is going to do it in the future or an end_io after an 1546 * error has already done it. 1547 */ 1548 if (ret == -EIOCBQUEUED || !ocfs2_iocb_is_rw_locked(iocb)) { 1549 rw_level = -1; 1550 have_alloc_sem = 0; 1551 } 1552 1553out: 1554 if (rw_level != -1) 1555 ocfs2_rw_unlock(inode, rw_level); 1556 1557out_sems: 1558 if (have_alloc_sem) 1559 up_read(&inode->i_alloc_sem); 1560 1561 if (written > 0 && sync) { 1562 ssize_t err; 1563 1564 err = sync_page_range_nolock(inode, file->f_mapping, pos, count); 1565 if (err < 0) 1566 written = err; 1567 } 1568 1569 mutex_unlock(&inode->i_mutex); 1570 1571 mlog_exit(ret); 1572 return written ? written : ret; 1573} 1574 1575static int ocfs2_splice_write_actor(struct pipe_inode_info *pipe, 1576 struct pipe_buffer *buf, 1577 struct splice_desc *sd) 1578{ 1579 int ret, count, total = 0; 1580 ssize_t copied = 0; 1581 struct ocfs2_splice_write_priv sp; 1582 1583 ret = buf->ops->pin(pipe, buf); 1584 if (ret) 1585 goto out; 1586 1587 sp.s_sd = sd; 1588 sp.s_buf = buf; 1589 sp.s_pipe = pipe; 1590 sp.s_offset = sd->pos & ~PAGE_CACHE_MASK; 1591 sp.s_buf_offset = buf->offset; 1592 1593 count = sd->len; 1594 if (count + sp.s_offset > PAGE_CACHE_SIZE) 1595 count = PAGE_CACHE_SIZE - sp.s_offset; 1596 1597 do { 1598 /* 1599 * splice wants us to copy up to one page at a 1600 * time. For pagesize > cluster size, this means we 1601 * might enter ocfs2_buffered_write_cluster() more 1602 * than once, so keep track of our progress here. 1603 */ 1604 copied = ocfs2_buffered_write_cluster(sd->file, 1605 (loff_t)sd->pos + total, 1606 count, 1607 ocfs2_map_and_write_splice_data, 1608 &sp); 1609 if (copied < 0) { 1610 mlog_errno(copied); 1611 ret = copied; 1612 goto out; 1613 } 1614 1615 count -= copied; 1616 sp.s_offset += copied; 1617 sp.s_buf_offset += copied; 1618 total += copied; 1619 } while (count); 1620 1621 ret = 0; 1622out: 1623 1624 return total ? total : ret; 1625} 1626 1627static ssize_t __ocfs2_file_splice_write(struct pipe_inode_info *pipe, 1628 struct file *out, 1629 loff_t *ppos, 1630 size_t len, 1631 unsigned int flags) 1632{ 1633 int ret, err; 1634 struct address_space *mapping = out->f_mapping; 1635 struct inode *inode = mapping->host; 1636 1637 ret = __splice_from_pipe(pipe, out, ppos, len, flags, 1638 ocfs2_splice_write_actor); 1639 if (ret > 0) { 1640 *ppos += ret; 1641 1642 if (unlikely((out->f_flags & O_SYNC) || IS_SYNC(inode))) { 1643 err = generic_osync_inode(inode, mapping, 1644 OSYNC_METADATA|OSYNC_DATA); 1645 if (err) 1646 ret = err; 1647 } 1648 } 1649 1650 return ret; 1651} 1652 1653static ssize_t ocfs2_file_splice_write(struct pipe_inode_info *pipe, 1654 struct file *out, 1655 loff_t *ppos, 1656 size_t len, 1657 unsigned int flags) 1658{ 1659 int ret; 1660 struct inode *inode = out->f_path.dentry->d_inode; 1661 1662 mlog_entry("(0x%p, 0x%p, %u, '%.*s')\n", out, pipe, 1663 (unsigned int)len, 1664 out->f_path.dentry->d_name.len, 1665 out->f_path.dentry->d_name.name); 1666 1667 inode_double_lock(inode, pipe->inode); 1668 1669 ret = ocfs2_rw_lock(inode, 1); 1670 if (ret < 0) { 1671 mlog_errno(ret); 1672 goto out; 1673 } 1674 1675 ret = ocfs2_prepare_inode_for_write(out->f_path.dentry, ppos, len, 0, 1676 NULL); 1677 if (ret < 0) { 1678 mlog_errno(ret); 1679 goto out_unlock; 1680 } 1681 1682 /* ok, we're done with i_size and alloc work */ 1683 ret = __ocfs2_file_splice_write(pipe, out, ppos, len, flags); 1684 1685out_unlock: 1686 ocfs2_rw_unlock(inode, 1); 1687out: 1688 inode_double_unlock(inode, pipe->inode); 1689 1690 mlog_exit(ret); 1691 return ret; 1692} 1693 1694static ssize_t ocfs2_file_splice_read(struct file *in, 1695 loff_t *ppos, 1696 struct pipe_inode_info *pipe, 1697 size_t len, 1698 unsigned int flags) 1699{ 1700 int ret = 0; 1701 struct inode *inode = in->f_path.dentry->d_inode; 1702 1703 mlog_entry("(0x%p, 0x%p, %u, '%.*s')\n", in, pipe, 1704 (unsigned int)len, 1705 in->f_path.dentry->d_name.len, 1706 in->f_path.dentry->d_name.name); 1707 1708 /* 1709 * See the comment in ocfs2_file_aio_read() 1710 */ 1711 ret = ocfs2_meta_lock(inode, NULL, 0); 1712 if (ret < 0) { 1713 mlog_errno(ret); 1714 goto bail; 1715 } 1716 ocfs2_meta_unlock(inode, 0); 1717 1718 ret = generic_file_splice_read(in, ppos, pipe, len, flags); 1719 1720bail: 1721 mlog_exit(ret); 1722 return ret; 1723} 1724 1725static ssize_t ocfs2_file_aio_read(struct kiocb *iocb, 1726 const struct iovec *iov, 1727 unsigned long nr_segs, 1728 loff_t pos) 1729{ 1730 int ret = 0, rw_level = -1, have_alloc_sem = 0, lock_level = 0; 1731 struct file *filp = iocb->ki_filp; 1732 struct inode *inode = filp->f_path.dentry->d_inode; 1733 1734 mlog_entry("(0x%p, %u, '%.*s')\n", filp, 1735 (unsigned int)nr_segs, 1736 filp->f_path.dentry->d_name.len, 1737 filp->f_path.dentry->d_name.name); 1738 1739 if (!inode) { 1740 ret = -EINVAL; 1741 mlog_errno(ret); 1742 goto bail; 1743 } 1744 1745 /* 1746 * buffered reads protect themselves in ->readpage(). O_DIRECT reads 1747 * need locks to protect pending reads from racing with truncate. 1748 */ 1749 if (filp->f_flags & O_DIRECT) { 1750 down_read(&inode->i_alloc_sem); 1751 have_alloc_sem = 1; 1752 1753 ret = ocfs2_rw_lock(inode, 0); 1754 if (ret < 0) { 1755 mlog_errno(ret); 1756 goto bail; 1757 } 1758 rw_level = 0; 1759 /* communicate with ocfs2_dio_end_io */ 1760 ocfs2_iocb_set_rw_locked(iocb, rw_level); 1761 } 1762 1763 /* 1764 * We're fine letting folks race truncates and extending 1765 * writes with read across the cluster, just like they can 1766 * locally. Hence no rw_lock during read. 1767 * 1768 * Take and drop the meta data lock to update inode fields 1769 * like i_size. This allows the checks down below 1770 * generic_file_aio_read() a chance of actually working. 1771 */ 1772 ret = ocfs2_meta_lock_atime(inode, filp->f_vfsmnt, &lock_level); 1773 if (ret < 0) { 1774 mlog_errno(ret); 1775 goto bail; 1776 } 1777 ocfs2_meta_unlock(inode, lock_level); 1778 1779 ret = generic_file_aio_read(iocb, iov, nr_segs, iocb->ki_pos); 1780 if (ret == -EINVAL) 1781 mlog(ML_ERROR, "generic_file_aio_read returned -EINVAL\n"); 1782 1783 /* buffered aio wouldn't have proper lock coverage today */ 1784 BUG_ON(ret == -EIOCBQUEUED && !(filp->f_flags & O_DIRECT)); 1785 1786 /* see ocfs2_file_aio_write */ 1787 if (ret == -EIOCBQUEUED || !ocfs2_iocb_is_rw_locked(iocb)) { 1788 rw_level = -1; 1789 have_alloc_sem = 0; 1790 } 1791 1792bail: 1793 if (have_alloc_sem) 1794 up_read(&inode->i_alloc_sem); 1795 if (rw_level != -1) 1796 ocfs2_rw_unlock(inode, rw_level); 1797 mlog_exit(ret); 1798 1799 return ret; 1800} 1801 1802const struct inode_operations ocfs2_file_iops = { 1803 .setattr = ocfs2_setattr, 1804 .getattr = ocfs2_getattr, 1805 .permission = ocfs2_permission, 1806}; 1807 1808const struct inode_operations ocfs2_special_file_iops = { 1809 .setattr = ocfs2_setattr, 1810 .getattr = ocfs2_getattr, 1811 .permission = ocfs2_permission, 1812}; 1813 1814const struct file_operations ocfs2_fops = { 1815 .read = do_sync_read, 1816 .write = do_sync_write, 1817 .sendfile = generic_file_sendfile, 1818 .mmap = ocfs2_mmap, 1819 .fsync = ocfs2_sync_file, 1820 .release = ocfs2_file_release, 1821 .open = ocfs2_file_open, 1822 .aio_read = ocfs2_file_aio_read, 1823 .aio_write = ocfs2_file_aio_write, 1824 .ioctl = ocfs2_ioctl, 1825#ifdef CONFIG_COMPAT 1826 .compat_ioctl = ocfs2_compat_ioctl, 1827#endif 1828 .splice_read = ocfs2_file_splice_read, 1829 .splice_write = ocfs2_file_splice_write, 1830}; 1831 1832const struct file_operations ocfs2_dops = { 1833 .read = generic_read_dir, 1834 .readdir = ocfs2_readdir, 1835 .fsync = ocfs2_sync_file, 1836 .ioctl = ocfs2_ioctl, 1837#ifdef CONFIG_COMPAT 1838 .compat_ioctl = ocfs2_compat_ioctl, 1839#endif 1840}; 1841