1 /* 2 * inode.c - NILFS inode operations. 3 * 4 * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation. 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * Written by Ryusuke Konishi. 17 * 18 */ 19 20 #include <linux/buffer_head.h> 21 #include <linux/gfp.h> 22 #include <linux/mpage.h> 23 #include <linux/pagemap.h> 24 #include <linux/writeback.h> 25 #include <linux/uio.h> 26 #include "nilfs.h" 27 #include "btnode.h" 28 #include "segment.h" 29 #include "page.h" 30 #include "mdt.h" 31 #include "cpfile.h" 32 #include "ifile.h" 33 34 /** 35 * struct nilfs_iget_args - arguments used during comparison between inodes 36 * @ino: inode number 37 * @cno: checkpoint number 38 * @root: pointer on NILFS root object (mounted checkpoint) 39 * @for_gc: inode for GC flag 40 */ 41 struct nilfs_iget_args { 42 u64 ino; 43 __u64 cno; 44 struct nilfs_root *root; 45 int for_gc; 46 }; 47 48 static int nilfs_iget_test(struct inode *inode, void *opaque); 49 50 void nilfs_inode_add_blocks(struct inode *inode, int n) 51 { 52 struct nilfs_root *root = NILFS_I(inode)->i_root; 53 54 inode_add_bytes(inode, (1 << inode->i_blkbits) * n); 55 if (root) 56 atomic64_add(n, &root->blocks_count); 57 } 58 59 void nilfs_inode_sub_blocks(struct inode *inode, int n) 60 { 61 struct nilfs_root *root = NILFS_I(inode)->i_root; 62 63 inode_sub_bytes(inode, (1 << inode->i_blkbits) * n); 64 if (root) 65 atomic64_sub(n, &root->blocks_count); 66 } 67 68 /** 69 * nilfs_get_block() - get a file block on the filesystem (callback function) 70 * @inode - inode struct of the target file 71 * @blkoff - file block number 72 * @bh_result - buffer head to be mapped on 73 * @create - indicate whether allocating the block or not when it has not 74 * been allocated yet. 75 * 76 * This function does not issue actual read request of the specified data 77 * block. It is done by VFS. 78 */ 79 int nilfs_get_block(struct inode *inode, sector_t blkoff, 80 struct buffer_head *bh_result, int create) 81 { 82 struct nilfs_inode_info *ii = NILFS_I(inode); 83 struct the_nilfs *nilfs = inode->i_sb->s_fs_info; 84 __u64 blknum = 0; 85 int err = 0, ret; 86 unsigned maxblocks = bh_result->b_size >> inode->i_blkbits; 87 88 down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem); 89 ret = nilfs_bmap_lookup_contig(ii->i_bmap, blkoff, &blknum, maxblocks); 90 up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem); 91 if (ret >= 0) { /* found */ 92 map_bh(bh_result, inode->i_sb, blknum); 93 if (ret > 0) 94 bh_result->b_size = (ret << inode->i_blkbits); 95 goto out; 96 } 97 /* data block was not found */ 98 if (ret == -ENOENT && create) { 99 struct nilfs_transaction_info ti; 100 101 bh_result->b_blocknr = 0; 102 err = nilfs_transaction_begin(inode->i_sb, &ti, 1); 103 if (unlikely(err)) 104 goto out; 105 err = nilfs_bmap_insert(ii->i_bmap, blkoff, 106 (unsigned long)bh_result); 107 if (unlikely(err != 0)) { 108 if (err == -EEXIST) { 109 /* 110 * The get_block() function could be called 111 * from multiple callers for an inode. 112 * However, the page having this block must 113 * be locked in this case. 114 */ 115 printk(KERN_WARNING 116 "nilfs_get_block: a race condition " 117 "while inserting a data block. " 118 "(inode number=%lu, file block " 119 "offset=%llu)\n", 120 inode->i_ino, 121 (unsigned long long)blkoff); 122 err = 0; 123 } 124 nilfs_transaction_abort(inode->i_sb); 125 goto out; 126 } 127 nilfs_mark_inode_dirty_sync(inode); 128 nilfs_transaction_commit(inode->i_sb); /* never fails */ 129 /* Error handling should be detailed */ 130 set_buffer_new(bh_result); 131 set_buffer_delay(bh_result); 132 map_bh(bh_result, inode->i_sb, 0); /* dbn must be changed 133 to proper value */ 134 } else if (ret == -ENOENT) { 135 /* not found is not error (e.g. hole); must return without 136 the mapped state flag. */ 137 ; 138 } else { 139 err = ret; 140 } 141 142 out: 143 return err; 144 } 145 146 /** 147 * nilfs_readpage() - implement readpage() method of nilfs_aops {} 148 * address_space_operations. 149 * @file - file struct of the file to be read 150 * @page - the page to be read 151 */ 152 static int nilfs_readpage(struct file *file, struct page *page) 153 { 154 return mpage_readpage(page, nilfs_get_block); 155 } 156 157 /** 158 * nilfs_readpages() - implement readpages() method of nilfs_aops {} 159 * address_space_operations. 160 * @file - file struct of the file to be read 161 * @mapping - address_space struct used for reading multiple pages 162 * @pages - the pages to be read 163 * @nr_pages - number of pages to be read 164 */ 165 static int nilfs_readpages(struct file *file, struct address_space *mapping, 166 struct list_head *pages, unsigned nr_pages) 167 { 168 return mpage_readpages(mapping, pages, nr_pages, nilfs_get_block); 169 } 170 171 static int nilfs_writepages(struct address_space *mapping, 172 struct writeback_control *wbc) 173 { 174 struct inode *inode = mapping->host; 175 int err = 0; 176 177 if (inode->i_sb->s_flags & MS_RDONLY) { 178 nilfs_clear_dirty_pages(mapping, false); 179 return -EROFS; 180 } 181 182 if (wbc->sync_mode == WB_SYNC_ALL) 183 err = nilfs_construct_dsync_segment(inode->i_sb, inode, 184 wbc->range_start, 185 wbc->range_end); 186 return err; 187 } 188 189 static int nilfs_writepage(struct page *page, struct writeback_control *wbc) 190 { 191 struct inode *inode = page->mapping->host; 192 int err; 193 194 if (inode->i_sb->s_flags & MS_RDONLY) { 195 /* 196 * It means that filesystem was remounted in read-only 197 * mode because of error or metadata corruption. But we 198 * have dirty pages that try to be flushed in background. 199 * So, here we simply discard this dirty page. 200 */ 201 nilfs_clear_dirty_page(page, false); 202 unlock_page(page); 203 return -EROFS; 204 } 205 206 redirty_page_for_writepage(wbc, page); 207 unlock_page(page); 208 209 if (wbc->sync_mode == WB_SYNC_ALL) { 210 err = nilfs_construct_segment(inode->i_sb); 211 if (unlikely(err)) 212 return err; 213 } else if (wbc->for_reclaim) 214 nilfs_flush_segment(inode->i_sb, inode->i_ino); 215 216 return 0; 217 } 218 219 static int nilfs_set_page_dirty(struct page *page) 220 { 221 struct inode *inode = page->mapping->host; 222 int ret = __set_page_dirty_nobuffers(page); 223 224 if (page_has_buffers(page)) { 225 unsigned nr_dirty = 0; 226 struct buffer_head *bh, *head; 227 228 /* 229 * This page is locked by callers, and no other thread 230 * concurrently marks its buffers dirty since they are 231 * only dirtied through routines in fs/buffer.c in 232 * which call sites of mark_buffer_dirty are protected 233 * by page lock. 234 */ 235 bh = head = page_buffers(page); 236 do { 237 /* Do not mark hole blocks dirty */ 238 if (buffer_dirty(bh) || !buffer_mapped(bh)) 239 continue; 240 241 set_buffer_dirty(bh); 242 nr_dirty++; 243 } while (bh = bh->b_this_page, bh != head); 244 245 if (nr_dirty) 246 nilfs_set_file_dirty(inode, nr_dirty); 247 } else if (ret) { 248 unsigned nr_dirty = 1 << (PAGE_SHIFT - inode->i_blkbits); 249 250 nilfs_set_file_dirty(inode, nr_dirty); 251 } 252 return ret; 253 } 254 255 void nilfs_write_failed(struct address_space *mapping, loff_t to) 256 { 257 struct inode *inode = mapping->host; 258 259 if (to > inode->i_size) { 260 truncate_pagecache(inode, inode->i_size); 261 nilfs_truncate(inode); 262 } 263 } 264 265 static int nilfs_write_begin(struct file *file, struct address_space *mapping, 266 loff_t pos, unsigned len, unsigned flags, 267 struct page **pagep, void **fsdata) 268 269 { 270 struct inode *inode = mapping->host; 271 int err = nilfs_transaction_begin(inode->i_sb, NULL, 1); 272 273 if (unlikely(err)) 274 return err; 275 276 err = block_write_begin(mapping, pos, len, flags, pagep, 277 nilfs_get_block); 278 if (unlikely(err)) { 279 nilfs_write_failed(mapping, pos + len); 280 nilfs_transaction_abort(inode->i_sb); 281 } 282 return err; 283 } 284 285 static int nilfs_write_end(struct file *file, struct address_space *mapping, 286 loff_t pos, unsigned len, unsigned copied, 287 struct page *page, void *fsdata) 288 { 289 struct inode *inode = mapping->host; 290 unsigned start = pos & (PAGE_SIZE - 1); 291 unsigned nr_dirty; 292 int err; 293 294 nr_dirty = nilfs_page_count_clean_buffers(page, start, 295 start + copied); 296 copied = generic_write_end(file, mapping, pos, len, copied, page, 297 fsdata); 298 nilfs_set_file_dirty(inode, nr_dirty); 299 err = nilfs_transaction_commit(inode->i_sb); 300 return err ? : copied; 301 } 302 303 static ssize_t 304 nilfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter) 305 { 306 struct inode *inode = file_inode(iocb->ki_filp); 307 308 if (iov_iter_rw(iter) == WRITE) 309 return 0; 310 311 /* Needs synchronization with the cleaner */ 312 return blockdev_direct_IO(iocb, inode, iter, nilfs_get_block); 313 } 314 315 const struct address_space_operations nilfs_aops = { 316 .writepage = nilfs_writepage, 317 .readpage = nilfs_readpage, 318 .writepages = nilfs_writepages, 319 .set_page_dirty = nilfs_set_page_dirty, 320 .readpages = nilfs_readpages, 321 .write_begin = nilfs_write_begin, 322 .write_end = nilfs_write_end, 323 /* .releasepage = nilfs_releasepage, */ 324 .invalidatepage = block_invalidatepage, 325 .direct_IO = nilfs_direct_IO, 326 .is_partially_uptodate = block_is_partially_uptodate, 327 }; 328 329 static int nilfs_insert_inode_locked(struct inode *inode, 330 struct nilfs_root *root, 331 unsigned long ino) 332 { 333 struct nilfs_iget_args args = { 334 .ino = ino, .root = root, .cno = 0, .for_gc = 0 335 }; 336 337 return insert_inode_locked4(inode, ino, nilfs_iget_test, &args); 338 } 339 340 struct inode *nilfs_new_inode(struct inode *dir, umode_t mode) 341 { 342 struct super_block *sb = dir->i_sb; 343 struct the_nilfs *nilfs = sb->s_fs_info; 344 struct inode *inode; 345 struct nilfs_inode_info *ii; 346 struct nilfs_root *root; 347 int err = -ENOMEM; 348 ino_t ino; 349 350 inode = new_inode(sb); 351 if (unlikely(!inode)) 352 goto failed; 353 354 mapping_set_gfp_mask(inode->i_mapping, 355 mapping_gfp_constraint(inode->i_mapping, ~__GFP_FS)); 356 357 root = NILFS_I(dir)->i_root; 358 ii = NILFS_I(inode); 359 ii->i_state = 1 << NILFS_I_NEW; 360 ii->i_root = root; 361 362 err = nilfs_ifile_create_inode(root->ifile, &ino, &ii->i_bh); 363 if (unlikely(err)) 364 goto failed_ifile_create_inode; 365 /* reference count of i_bh inherits from nilfs_mdt_read_block() */ 366 367 atomic64_inc(&root->inodes_count); 368 inode_init_owner(inode, dir, mode); 369 inode->i_ino = ino; 370 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; 371 372 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) { 373 err = nilfs_bmap_read(ii->i_bmap, NULL); 374 if (err < 0) 375 goto failed_after_creation; 376 377 set_bit(NILFS_I_BMAP, &ii->i_state); 378 /* No lock is needed; iget() ensures it. */ 379 } 380 381 ii->i_flags = nilfs_mask_flags( 382 mode, NILFS_I(dir)->i_flags & NILFS_FL_INHERITED); 383 384 /* ii->i_file_acl = 0; */ 385 /* ii->i_dir_acl = 0; */ 386 ii->i_dir_start_lookup = 0; 387 nilfs_set_inode_flags(inode); 388 spin_lock(&nilfs->ns_next_gen_lock); 389 inode->i_generation = nilfs->ns_next_generation++; 390 spin_unlock(&nilfs->ns_next_gen_lock); 391 if (nilfs_insert_inode_locked(inode, root, ino) < 0) { 392 err = -EIO; 393 goto failed_after_creation; 394 } 395 396 err = nilfs_init_acl(inode, dir); 397 if (unlikely(err)) 398 goto failed_after_creation; /* never occur. When supporting 399 nilfs_init_acl(), proper cancellation of 400 above jobs should be considered */ 401 402 return inode; 403 404 failed_after_creation: 405 clear_nlink(inode); 406 unlock_new_inode(inode); 407 iput(inode); /* raw_inode will be deleted through 408 nilfs_evict_inode() */ 409 goto failed; 410 411 failed_ifile_create_inode: 412 make_bad_inode(inode); 413 iput(inode); /* if i_nlink == 1, generic_forget_inode() will be 414 called */ 415 failed: 416 return ERR_PTR(err); 417 } 418 419 void nilfs_set_inode_flags(struct inode *inode) 420 { 421 unsigned int flags = NILFS_I(inode)->i_flags; 422 unsigned int new_fl = 0; 423 424 if (flags & FS_SYNC_FL) 425 new_fl |= S_SYNC; 426 if (flags & FS_APPEND_FL) 427 new_fl |= S_APPEND; 428 if (flags & FS_IMMUTABLE_FL) 429 new_fl |= S_IMMUTABLE; 430 if (flags & FS_NOATIME_FL) 431 new_fl |= S_NOATIME; 432 if (flags & FS_DIRSYNC_FL) 433 new_fl |= S_DIRSYNC; 434 inode_set_flags(inode, new_fl, S_SYNC | S_APPEND | S_IMMUTABLE | 435 S_NOATIME | S_DIRSYNC); 436 } 437 438 int nilfs_read_inode_common(struct inode *inode, 439 struct nilfs_inode *raw_inode) 440 { 441 struct nilfs_inode_info *ii = NILFS_I(inode); 442 int err; 443 444 inode->i_mode = le16_to_cpu(raw_inode->i_mode); 445 i_uid_write(inode, le32_to_cpu(raw_inode->i_uid)); 446 i_gid_write(inode, le32_to_cpu(raw_inode->i_gid)); 447 set_nlink(inode, le16_to_cpu(raw_inode->i_links_count)); 448 inode->i_size = le64_to_cpu(raw_inode->i_size); 449 inode->i_atime.tv_sec = le64_to_cpu(raw_inode->i_mtime); 450 inode->i_ctime.tv_sec = le64_to_cpu(raw_inode->i_ctime); 451 inode->i_mtime.tv_sec = le64_to_cpu(raw_inode->i_mtime); 452 inode->i_atime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec); 453 inode->i_ctime.tv_nsec = le32_to_cpu(raw_inode->i_ctime_nsec); 454 inode->i_mtime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec); 455 if (inode->i_nlink == 0) 456 return -ESTALE; /* this inode is deleted */ 457 458 inode->i_blocks = le64_to_cpu(raw_inode->i_blocks); 459 ii->i_flags = le32_to_cpu(raw_inode->i_flags); 460 #if 0 461 ii->i_file_acl = le32_to_cpu(raw_inode->i_file_acl); 462 ii->i_dir_acl = S_ISREG(inode->i_mode) ? 463 0 : le32_to_cpu(raw_inode->i_dir_acl); 464 #endif 465 ii->i_dir_start_lookup = 0; 466 inode->i_generation = le32_to_cpu(raw_inode->i_generation); 467 468 if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || 469 S_ISLNK(inode->i_mode)) { 470 err = nilfs_bmap_read(ii->i_bmap, raw_inode); 471 if (err < 0) 472 return err; 473 set_bit(NILFS_I_BMAP, &ii->i_state); 474 /* No lock is needed; iget() ensures it. */ 475 } 476 return 0; 477 } 478 479 static int __nilfs_read_inode(struct super_block *sb, 480 struct nilfs_root *root, unsigned long ino, 481 struct inode *inode) 482 { 483 struct the_nilfs *nilfs = sb->s_fs_info; 484 struct buffer_head *bh; 485 struct nilfs_inode *raw_inode; 486 int err; 487 488 down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem); 489 err = nilfs_ifile_get_inode_block(root->ifile, ino, &bh); 490 if (unlikely(err)) 491 goto bad_inode; 492 493 raw_inode = nilfs_ifile_map_inode(root->ifile, ino, bh); 494 495 err = nilfs_read_inode_common(inode, raw_inode); 496 if (err) 497 goto failed_unmap; 498 499 if (S_ISREG(inode->i_mode)) { 500 inode->i_op = &nilfs_file_inode_operations; 501 inode->i_fop = &nilfs_file_operations; 502 inode->i_mapping->a_ops = &nilfs_aops; 503 } else if (S_ISDIR(inode->i_mode)) { 504 inode->i_op = &nilfs_dir_inode_operations; 505 inode->i_fop = &nilfs_dir_operations; 506 inode->i_mapping->a_ops = &nilfs_aops; 507 } else if (S_ISLNK(inode->i_mode)) { 508 inode->i_op = &nilfs_symlink_inode_operations; 509 inode_nohighmem(inode); 510 inode->i_mapping->a_ops = &nilfs_aops; 511 } else { 512 inode->i_op = &nilfs_special_inode_operations; 513 init_special_inode( 514 inode, inode->i_mode, 515 huge_decode_dev(le64_to_cpu(raw_inode->i_device_code))); 516 } 517 nilfs_ifile_unmap_inode(root->ifile, ino, bh); 518 brelse(bh); 519 up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem); 520 nilfs_set_inode_flags(inode); 521 mapping_set_gfp_mask(inode->i_mapping, 522 mapping_gfp_constraint(inode->i_mapping, ~__GFP_FS)); 523 return 0; 524 525 failed_unmap: 526 nilfs_ifile_unmap_inode(root->ifile, ino, bh); 527 brelse(bh); 528 529 bad_inode: 530 up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem); 531 return err; 532 } 533 534 static int nilfs_iget_test(struct inode *inode, void *opaque) 535 { 536 struct nilfs_iget_args *args = opaque; 537 struct nilfs_inode_info *ii; 538 539 if (args->ino != inode->i_ino || args->root != NILFS_I(inode)->i_root) 540 return 0; 541 542 ii = NILFS_I(inode); 543 if (!test_bit(NILFS_I_GCINODE, &ii->i_state)) 544 return !args->for_gc; 545 546 return args->for_gc && args->cno == ii->i_cno; 547 } 548 549 static int nilfs_iget_set(struct inode *inode, void *opaque) 550 { 551 struct nilfs_iget_args *args = opaque; 552 553 inode->i_ino = args->ino; 554 if (args->for_gc) { 555 NILFS_I(inode)->i_state = 1 << NILFS_I_GCINODE; 556 NILFS_I(inode)->i_cno = args->cno; 557 NILFS_I(inode)->i_root = NULL; 558 } else { 559 if (args->root && args->ino == NILFS_ROOT_INO) 560 nilfs_get_root(args->root); 561 NILFS_I(inode)->i_root = args->root; 562 } 563 return 0; 564 } 565 566 struct inode *nilfs_ilookup(struct super_block *sb, struct nilfs_root *root, 567 unsigned long ino) 568 { 569 struct nilfs_iget_args args = { 570 .ino = ino, .root = root, .cno = 0, .for_gc = 0 571 }; 572 573 return ilookup5(sb, ino, nilfs_iget_test, &args); 574 } 575 576 struct inode *nilfs_iget_locked(struct super_block *sb, struct nilfs_root *root, 577 unsigned long ino) 578 { 579 struct nilfs_iget_args args = { 580 .ino = ino, .root = root, .cno = 0, .for_gc = 0 581 }; 582 583 return iget5_locked(sb, ino, nilfs_iget_test, nilfs_iget_set, &args); 584 } 585 586 struct inode *nilfs_iget(struct super_block *sb, struct nilfs_root *root, 587 unsigned long ino) 588 { 589 struct inode *inode; 590 int err; 591 592 inode = nilfs_iget_locked(sb, root, ino); 593 if (unlikely(!inode)) 594 return ERR_PTR(-ENOMEM); 595 if (!(inode->i_state & I_NEW)) 596 return inode; 597 598 err = __nilfs_read_inode(sb, root, ino, inode); 599 if (unlikely(err)) { 600 iget_failed(inode); 601 return ERR_PTR(err); 602 } 603 unlock_new_inode(inode); 604 return inode; 605 } 606 607 struct inode *nilfs_iget_for_gc(struct super_block *sb, unsigned long ino, 608 __u64 cno) 609 { 610 struct nilfs_iget_args args = { 611 .ino = ino, .root = NULL, .cno = cno, .for_gc = 1 612 }; 613 struct inode *inode; 614 int err; 615 616 inode = iget5_locked(sb, ino, nilfs_iget_test, nilfs_iget_set, &args); 617 if (unlikely(!inode)) 618 return ERR_PTR(-ENOMEM); 619 if (!(inode->i_state & I_NEW)) 620 return inode; 621 622 err = nilfs_init_gcinode(inode); 623 if (unlikely(err)) { 624 iget_failed(inode); 625 return ERR_PTR(err); 626 } 627 unlock_new_inode(inode); 628 return inode; 629 } 630 631 void nilfs_write_inode_common(struct inode *inode, 632 struct nilfs_inode *raw_inode, int has_bmap) 633 { 634 struct nilfs_inode_info *ii = NILFS_I(inode); 635 636 raw_inode->i_mode = cpu_to_le16(inode->i_mode); 637 raw_inode->i_uid = cpu_to_le32(i_uid_read(inode)); 638 raw_inode->i_gid = cpu_to_le32(i_gid_read(inode)); 639 raw_inode->i_links_count = cpu_to_le16(inode->i_nlink); 640 raw_inode->i_size = cpu_to_le64(inode->i_size); 641 raw_inode->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec); 642 raw_inode->i_mtime = cpu_to_le64(inode->i_mtime.tv_sec); 643 raw_inode->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec); 644 raw_inode->i_mtime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec); 645 raw_inode->i_blocks = cpu_to_le64(inode->i_blocks); 646 647 raw_inode->i_flags = cpu_to_le32(ii->i_flags); 648 raw_inode->i_generation = cpu_to_le32(inode->i_generation); 649 650 if (NILFS_ROOT_METADATA_FILE(inode->i_ino)) { 651 struct the_nilfs *nilfs = inode->i_sb->s_fs_info; 652 653 /* zero-fill unused portion in the case of super root block */ 654 raw_inode->i_xattr = 0; 655 raw_inode->i_pad = 0; 656 memset((void *)raw_inode + sizeof(*raw_inode), 0, 657 nilfs->ns_inode_size - sizeof(*raw_inode)); 658 } 659 660 if (has_bmap) 661 nilfs_bmap_write(ii->i_bmap, raw_inode); 662 else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) 663 raw_inode->i_device_code = 664 cpu_to_le64(huge_encode_dev(inode->i_rdev)); 665 /* When extending inode, nilfs->ns_inode_size should be checked 666 for substitutions of appended fields */ 667 } 668 669 void nilfs_update_inode(struct inode *inode, struct buffer_head *ibh, int flags) 670 { 671 ino_t ino = inode->i_ino; 672 struct nilfs_inode_info *ii = NILFS_I(inode); 673 struct inode *ifile = ii->i_root->ifile; 674 struct nilfs_inode *raw_inode; 675 676 raw_inode = nilfs_ifile_map_inode(ifile, ino, ibh); 677 678 if (test_and_clear_bit(NILFS_I_NEW, &ii->i_state)) 679 memset(raw_inode, 0, NILFS_MDT(ifile)->mi_entry_size); 680 if (flags & I_DIRTY_DATASYNC) 681 set_bit(NILFS_I_INODE_SYNC, &ii->i_state); 682 683 nilfs_write_inode_common(inode, raw_inode, 0); 684 /* XXX: call with has_bmap = 0 is a workaround to avoid 685 deadlock of bmap. This delays update of i_bmap to just 686 before writing */ 687 nilfs_ifile_unmap_inode(ifile, ino, ibh); 688 } 689 690 #define NILFS_MAX_TRUNCATE_BLOCKS 16384 /* 64MB for 4KB block */ 691 692 static void nilfs_truncate_bmap(struct nilfs_inode_info *ii, 693 unsigned long from) 694 { 695 __u64 b; 696 int ret; 697 698 if (!test_bit(NILFS_I_BMAP, &ii->i_state)) 699 return; 700 repeat: 701 ret = nilfs_bmap_last_key(ii->i_bmap, &b); 702 if (ret == -ENOENT) 703 return; 704 else if (ret < 0) 705 goto failed; 706 707 if (b < from) 708 return; 709 710 b -= min_t(__u64, NILFS_MAX_TRUNCATE_BLOCKS, b - from); 711 ret = nilfs_bmap_truncate(ii->i_bmap, b); 712 nilfs_relax_pressure_in_lock(ii->vfs_inode.i_sb); 713 if (!ret || (ret == -ENOMEM && 714 nilfs_bmap_truncate(ii->i_bmap, b) == 0)) 715 goto repeat; 716 717 failed: 718 nilfs_warning(ii->vfs_inode.i_sb, __func__, 719 "failed to truncate bmap (ino=%lu, err=%d)", 720 ii->vfs_inode.i_ino, ret); 721 } 722 723 void nilfs_truncate(struct inode *inode) 724 { 725 unsigned long blkoff; 726 unsigned int blocksize; 727 struct nilfs_transaction_info ti; 728 struct super_block *sb = inode->i_sb; 729 struct nilfs_inode_info *ii = NILFS_I(inode); 730 731 if (!test_bit(NILFS_I_BMAP, &ii->i_state)) 732 return; 733 if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) 734 return; 735 736 blocksize = sb->s_blocksize; 737 blkoff = (inode->i_size + blocksize - 1) >> sb->s_blocksize_bits; 738 nilfs_transaction_begin(sb, &ti, 0); /* never fails */ 739 740 block_truncate_page(inode->i_mapping, inode->i_size, nilfs_get_block); 741 742 nilfs_truncate_bmap(ii, blkoff); 743 744 inode->i_mtime = inode->i_ctime = CURRENT_TIME; 745 if (IS_SYNC(inode)) 746 nilfs_set_transaction_flag(NILFS_TI_SYNC); 747 748 nilfs_mark_inode_dirty(inode); 749 nilfs_set_file_dirty(inode, 0); 750 nilfs_transaction_commit(sb); 751 /* May construct a logical segment and may fail in sync mode. 752 But truncate has no return value. */ 753 } 754 755 static void nilfs_clear_inode(struct inode *inode) 756 { 757 struct nilfs_inode_info *ii = NILFS_I(inode); 758 759 /* 760 * Free resources allocated in nilfs_read_inode(), here. 761 */ 762 BUG_ON(!list_empty(&ii->i_dirty)); 763 brelse(ii->i_bh); 764 ii->i_bh = NULL; 765 766 if (nilfs_is_metadata_file_inode(inode)) 767 nilfs_mdt_clear(inode); 768 769 if (test_bit(NILFS_I_BMAP, &ii->i_state)) 770 nilfs_bmap_clear(ii->i_bmap); 771 772 nilfs_btnode_cache_clear(&ii->i_btnode_cache); 773 774 if (ii->i_root && inode->i_ino == NILFS_ROOT_INO) 775 nilfs_put_root(ii->i_root); 776 } 777 778 void nilfs_evict_inode(struct inode *inode) 779 { 780 struct nilfs_transaction_info ti; 781 struct super_block *sb = inode->i_sb; 782 struct nilfs_inode_info *ii = NILFS_I(inode); 783 int ret; 784 785 if (inode->i_nlink || !ii->i_root || unlikely(is_bad_inode(inode))) { 786 truncate_inode_pages_final(&inode->i_data); 787 clear_inode(inode); 788 nilfs_clear_inode(inode); 789 return; 790 } 791 nilfs_transaction_begin(sb, &ti, 0); /* never fails */ 792 793 truncate_inode_pages_final(&inode->i_data); 794 795 /* TODO: some of the following operations may fail. */ 796 nilfs_truncate_bmap(ii, 0); 797 nilfs_mark_inode_dirty(inode); 798 clear_inode(inode); 799 800 ret = nilfs_ifile_delete_inode(ii->i_root->ifile, inode->i_ino); 801 if (!ret) 802 atomic64_dec(&ii->i_root->inodes_count); 803 804 nilfs_clear_inode(inode); 805 806 if (IS_SYNC(inode)) 807 nilfs_set_transaction_flag(NILFS_TI_SYNC); 808 nilfs_transaction_commit(sb); 809 /* May construct a logical segment and may fail in sync mode. 810 But delete_inode has no return value. */ 811 } 812 813 int nilfs_setattr(struct dentry *dentry, struct iattr *iattr) 814 { 815 struct nilfs_transaction_info ti; 816 struct inode *inode = d_inode(dentry); 817 struct super_block *sb = inode->i_sb; 818 int err; 819 820 err = inode_change_ok(inode, iattr); 821 if (err) 822 return err; 823 824 err = nilfs_transaction_begin(sb, &ti, 0); 825 if (unlikely(err)) 826 return err; 827 828 if ((iattr->ia_valid & ATTR_SIZE) && 829 iattr->ia_size != i_size_read(inode)) { 830 inode_dio_wait(inode); 831 truncate_setsize(inode, iattr->ia_size); 832 nilfs_truncate(inode); 833 } 834 835 setattr_copy(inode, iattr); 836 mark_inode_dirty(inode); 837 838 if (iattr->ia_valid & ATTR_MODE) { 839 err = nilfs_acl_chmod(inode); 840 if (unlikely(err)) 841 goto out_err; 842 } 843 844 return nilfs_transaction_commit(sb); 845 846 out_err: 847 nilfs_transaction_abort(sb); 848 return err; 849 } 850 851 int nilfs_permission(struct inode *inode, int mask) 852 { 853 struct nilfs_root *root = NILFS_I(inode)->i_root; 854 if ((mask & MAY_WRITE) && root && 855 root->cno != NILFS_CPTREE_CURRENT_CNO) 856 return -EROFS; /* snapshot is not writable */ 857 858 return generic_permission(inode, mask); 859 } 860 861 int nilfs_load_inode_block(struct inode *inode, struct buffer_head **pbh) 862 { 863 struct the_nilfs *nilfs = inode->i_sb->s_fs_info; 864 struct nilfs_inode_info *ii = NILFS_I(inode); 865 int err; 866 867 spin_lock(&nilfs->ns_inode_lock); 868 if (ii->i_bh == NULL) { 869 spin_unlock(&nilfs->ns_inode_lock); 870 err = nilfs_ifile_get_inode_block(ii->i_root->ifile, 871 inode->i_ino, pbh); 872 if (unlikely(err)) 873 return err; 874 spin_lock(&nilfs->ns_inode_lock); 875 if (ii->i_bh == NULL) 876 ii->i_bh = *pbh; 877 else { 878 brelse(*pbh); 879 *pbh = ii->i_bh; 880 } 881 } else 882 *pbh = ii->i_bh; 883 884 get_bh(*pbh); 885 spin_unlock(&nilfs->ns_inode_lock); 886 return 0; 887 } 888 889 int nilfs_inode_dirty(struct inode *inode) 890 { 891 struct nilfs_inode_info *ii = NILFS_I(inode); 892 struct the_nilfs *nilfs = inode->i_sb->s_fs_info; 893 int ret = 0; 894 895 if (!list_empty(&ii->i_dirty)) { 896 spin_lock(&nilfs->ns_inode_lock); 897 ret = test_bit(NILFS_I_DIRTY, &ii->i_state) || 898 test_bit(NILFS_I_BUSY, &ii->i_state); 899 spin_unlock(&nilfs->ns_inode_lock); 900 } 901 return ret; 902 } 903 904 int nilfs_set_file_dirty(struct inode *inode, unsigned nr_dirty) 905 { 906 struct nilfs_inode_info *ii = NILFS_I(inode); 907 struct the_nilfs *nilfs = inode->i_sb->s_fs_info; 908 909 atomic_add(nr_dirty, &nilfs->ns_ndirtyblks); 910 911 if (test_and_set_bit(NILFS_I_DIRTY, &ii->i_state)) 912 return 0; 913 914 spin_lock(&nilfs->ns_inode_lock); 915 if (!test_bit(NILFS_I_QUEUED, &ii->i_state) && 916 !test_bit(NILFS_I_BUSY, &ii->i_state)) { 917 /* Because this routine may race with nilfs_dispose_list(), 918 we have to check NILFS_I_QUEUED here, too. */ 919 if (list_empty(&ii->i_dirty) && igrab(inode) == NULL) { 920 /* This will happen when somebody is freeing 921 this inode. */ 922 nilfs_warning(inode->i_sb, __func__, 923 "cannot get inode (ino=%lu)\n", 924 inode->i_ino); 925 spin_unlock(&nilfs->ns_inode_lock); 926 return -EINVAL; /* NILFS_I_DIRTY may remain for 927 freeing inode */ 928 } 929 list_move_tail(&ii->i_dirty, &nilfs->ns_dirty_files); 930 set_bit(NILFS_I_QUEUED, &ii->i_state); 931 } 932 spin_unlock(&nilfs->ns_inode_lock); 933 return 0; 934 } 935 936 int __nilfs_mark_inode_dirty(struct inode *inode, int flags) 937 { 938 struct buffer_head *ibh; 939 int err; 940 941 err = nilfs_load_inode_block(inode, &ibh); 942 if (unlikely(err)) { 943 nilfs_warning(inode->i_sb, __func__, 944 "failed to reget inode block.\n"); 945 return err; 946 } 947 nilfs_update_inode(inode, ibh, flags); 948 mark_buffer_dirty(ibh); 949 nilfs_mdt_mark_dirty(NILFS_I(inode)->i_root->ifile); 950 brelse(ibh); 951 return 0; 952 } 953 954 /** 955 * nilfs_dirty_inode - reflect changes on given inode to an inode block. 956 * @inode: inode of the file to be registered. 957 * 958 * nilfs_dirty_inode() loads a inode block containing the specified 959 * @inode and copies data from a nilfs_inode to a corresponding inode 960 * entry in the inode block. This operation is excluded from the segment 961 * construction. This function can be called both as a single operation 962 * and as a part of indivisible file operations. 963 */ 964 void nilfs_dirty_inode(struct inode *inode, int flags) 965 { 966 struct nilfs_transaction_info ti; 967 struct nilfs_mdt_info *mdi = NILFS_MDT(inode); 968 969 if (is_bad_inode(inode)) { 970 nilfs_warning(inode->i_sb, __func__, 971 "tried to mark bad_inode dirty. ignored.\n"); 972 dump_stack(); 973 return; 974 } 975 if (mdi) { 976 nilfs_mdt_mark_dirty(inode); 977 return; 978 } 979 nilfs_transaction_begin(inode->i_sb, &ti, 0); 980 __nilfs_mark_inode_dirty(inode, flags); 981 nilfs_transaction_commit(inode->i_sb); /* never fails */ 982 } 983 984 int nilfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 985 __u64 start, __u64 len) 986 { 987 struct the_nilfs *nilfs = inode->i_sb->s_fs_info; 988 __u64 logical = 0, phys = 0, size = 0; 989 __u32 flags = 0; 990 loff_t isize; 991 sector_t blkoff, end_blkoff; 992 sector_t delalloc_blkoff; 993 unsigned long delalloc_blklen; 994 unsigned int blkbits = inode->i_blkbits; 995 int ret, n; 996 997 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC); 998 if (ret) 999 return ret; 1000 1001 inode_lock(inode); 1002 1003 isize = i_size_read(inode); 1004 1005 blkoff = start >> blkbits; 1006 end_blkoff = (start + len - 1) >> blkbits; 1007 1008 delalloc_blklen = nilfs_find_uncommitted_extent(inode, blkoff, 1009 &delalloc_blkoff); 1010 1011 do { 1012 __u64 blkphy; 1013 unsigned int maxblocks; 1014 1015 if (delalloc_blklen && blkoff == delalloc_blkoff) { 1016 if (size) { 1017 /* End of the current extent */ 1018 ret = fiemap_fill_next_extent( 1019 fieinfo, logical, phys, size, flags); 1020 if (ret) 1021 break; 1022 } 1023 if (blkoff > end_blkoff) 1024 break; 1025 1026 flags = FIEMAP_EXTENT_MERGED | FIEMAP_EXTENT_DELALLOC; 1027 logical = blkoff << blkbits; 1028 phys = 0; 1029 size = delalloc_blklen << blkbits; 1030 1031 blkoff = delalloc_blkoff + delalloc_blklen; 1032 delalloc_blklen = nilfs_find_uncommitted_extent( 1033 inode, blkoff, &delalloc_blkoff); 1034 continue; 1035 } 1036 1037 /* 1038 * Limit the number of blocks that we look up so as 1039 * not to get into the next delayed allocation extent. 1040 */ 1041 maxblocks = INT_MAX; 1042 if (delalloc_blklen) 1043 maxblocks = min_t(sector_t, delalloc_blkoff - blkoff, 1044 maxblocks); 1045 blkphy = 0; 1046 1047 down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem); 1048 n = nilfs_bmap_lookup_contig( 1049 NILFS_I(inode)->i_bmap, blkoff, &blkphy, maxblocks); 1050 up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem); 1051 1052 if (n < 0) { 1053 int past_eof; 1054 1055 if (unlikely(n != -ENOENT)) 1056 break; /* error */ 1057 1058 /* HOLE */ 1059 blkoff++; 1060 past_eof = ((blkoff << blkbits) >= isize); 1061 1062 if (size) { 1063 /* End of the current extent */ 1064 1065 if (past_eof) 1066 flags |= FIEMAP_EXTENT_LAST; 1067 1068 ret = fiemap_fill_next_extent( 1069 fieinfo, logical, phys, size, flags); 1070 if (ret) 1071 break; 1072 size = 0; 1073 } 1074 if (blkoff > end_blkoff || past_eof) 1075 break; 1076 } else { 1077 if (size) { 1078 if (phys && blkphy << blkbits == phys + size) { 1079 /* The current extent goes on */ 1080 size += n << blkbits; 1081 } else { 1082 /* Terminate the current extent */ 1083 ret = fiemap_fill_next_extent( 1084 fieinfo, logical, phys, size, 1085 flags); 1086 if (ret || blkoff > end_blkoff) 1087 break; 1088 1089 /* Start another extent */ 1090 flags = FIEMAP_EXTENT_MERGED; 1091 logical = blkoff << blkbits; 1092 phys = blkphy << blkbits; 1093 size = n << blkbits; 1094 } 1095 } else { 1096 /* Start a new extent */ 1097 flags = FIEMAP_EXTENT_MERGED; 1098 logical = blkoff << blkbits; 1099 phys = blkphy << blkbits; 1100 size = n << blkbits; 1101 } 1102 blkoff += n; 1103 } 1104 cond_resched(); 1105 } while (true); 1106 1107 /* If ret is 1 then we just hit the end of the extent array */ 1108 if (ret == 1) 1109 ret = 0; 1110 1111 inode_unlock(inode); 1112 return ret; 1113 } 1114