fs/nilfs2/inode.c

   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  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  19  *
  20  * Written by Ryusuke Konishi <ryusuke@osrg.net>
  21  *
  22  */
  23
  24 #include <linux/buffer_head.h>
  25 #include <linux/gfp.h>
  26 #include <linux/mpage.h>
  27 #include <linux/writeback.h>
  28 #include <linux/uio.h>
  29 #include "nilfs.h"
  30 #include "segment.h"
  31 #include "page.h"
  32 #include "mdt.h"
  33 #include "cpfile.h"
  34 #include "ifile.h"
  35
  36
  37 /**
  38  * nilfs_get_block() - get a file block on the filesystem (callback function)
  39  * @inode - inode struct of the target file
  40  * @blkoff - file block number
  41  * @bh_result - buffer head to be mapped on
  42  * @create - indicate whether allocating the block or not when it has not
  43  *      been allocated yet.
  44  *
  45  * This function does not issue actual read request of the specified data
  46  * block. It is done by VFS.
  47  */
  48 int nilfs_get_block(struct inode *inode, sector_t blkoff,
  49                     struct buffer_head *bh_result, int create)
  50 {
  51         struct nilfs_inode_info *ii = NILFS_I(inode);
  52         __u64 blknum = 0;
  53         int err = 0, ret;
  54         struct inode *dat = nilfs_dat_inode(NILFS_I_NILFS(inode));
  55         unsigned maxblocks = bh_result->b_size >> inode->i_blkbits;
  56
  57         down_read(&NILFS_MDT(dat)->mi_sem);
  58         ret = nilfs_bmap_lookup_contig(ii->i_bmap, blkoff, &blknum, maxblocks);
  59         up_read(&NILFS_MDT(dat)->mi_sem);
  60         if (ret >= 0) { /* found */
  61                 map_bh(bh_result, inode->i_sb, blknum);
  62                 if (ret > 0)
  63                         bh_result->b_size = (ret << inode->i_blkbits);
  64                 goto out;
  65         }
  66         /* data block was not found */
  67         if (ret == -ENOENT && create) {
  68                 struct nilfs_transaction_info ti;
  69
  70                 bh_result->b_blocknr = 0;
  71                 err = nilfs_transaction_begin(inode->i_sb, &ti, 1);
  72                 if (unlikely(err))
  73                         goto out;
  74                 err = nilfs_bmap_insert(ii->i_bmap, (unsigned long)blkoff,
  75                                         (unsigned long)bh_result);
  76                 if (unlikely(err != 0)) {
  77                         if (err == -EEXIST) {
  78                                 /*
  79                                  * The get_block() function could be called
  80                                  * from multiple callers for an inode.
  81                                  * However, the page having this block must
  82                                  * be locked in this case.
  83                                  */
  84                                 printk(KERN_WARNING
  85                                        "nilfs_get_block: a race condition "
  86                                        "while inserting a data block. "
  87                                        "(inode number=%lu, file block "
  88                                        "offset=%llu)\n",
  89                                        inode->i_ino,
  90                                        (unsigned long long)blkoff);
  91                                 err = 0;
  92                         } else if (err == -EINVAL) {
  93                                 nilfs_error(inode->i_sb, __func__,
  94                                             "broken bmap (inode=%lu)\n",
  95                                             inode->i_ino);
  96                                 err = -EIO;
  97                         }
  98                         nilfs_transaction_abort(inode->i_sb);
  99                         goto out;
 100                 }
 101                 nilfs_mark_inode_dirty(inode);
 102                 nilfs_transaction_commit(inode->i_sb); /* never fails */
 103                 /* Error handling should be detailed */
 104                 set_buffer_new(bh_result);
 105                 map_bh(bh_result, inode->i_sb, 0); /* dbn must be changed
 106                                                       to proper value */
 107         } else if (ret == -ENOENT) {
 108                 /* not found is not error (e.g. hole); must return without
 109                    the mapped state flag. */
 110                 ;
 111         } else {
 112                 err = ret;
 113         }
 114
 115  out:
 116         return err;
 117 }
 118
 119 /**
 120  * nilfs_readpage() - implement readpage() method of nilfs_aops {}
 121  * address_space_operations.
 122  * @file - file struct of the file to be read
 123  * @page - the page to be read
 124  */
 125 static int nilfs_readpage(struct file *file, struct page *page)
 126 {
 127         return mpage_readpage(page, nilfs_get_block);
 128 }
 129
 130 /**
 131  * nilfs_readpages() - implement readpages() method of nilfs_aops {}
 132  * address_space_operations.
 133  * @file - file struct of the file to be read
 134  * @mapping - address_space struct used for reading multiple pages
 135  * @pages - the pages to be read
 136  * @nr_pages - number of pages to be read
 137  */
 138 static int nilfs_readpages(struct file *file, struct address_space *mapping,
 139                            struct list_head *pages, unsigned nr_pages)
 140 {
 141         return mpage_readpages(mapping, pages, nr_pages, nilfs_get_block);
 142 }
 143
 144 static int nilfs_writepages(struct address_space *mapping,
 145                             struct writeback_control *wbc)
 146 {
 147         struct inode *inode = mapping->host;
 148         int err = 0;
 149
 150         if (wbc->sync_mode == WB_SYNC_ALL)
 151                 err = nilfs_construct_dsync_segment(inode->i_sb, inode,
 152                                                     wbc->range_start,
 153                                                     wbc->range_end);
 154         return err;
 155 }
 156
 157 static int nilfs_writepage(struct page *page, struct writeback_control *wbc)
 158 {
 159         struct inode *inode = page->mapping->host;
 160         int err;
 161
 162         redirty_page_for_writepage(wbc, page);
 163         unlock_page(page);
 164
 165         if (wbc->sync_mode == WB_SYNC_ALL) {
 166                 err = nilfs_construct_segment(inode->i_sb);
 167                 if (unlikely(err))
 168                         return err;
 169         } else if (wbc->for_reclaim)
 170                 nilfs_flush_segment(inode->i_sb, inode->i_ino);
 171
 172         return 0;
 173 }
 174
 175 static int nilfs_set_page_dirty(struct page *page)
 176 {
 177         int ret = __set_page_dirty_buffers(page);
 178
 179         if (ret) {
 180                 struct inode *inode = page->mapping->host;
 181                 struct nilfs_sb_info *sbi = NILFS_SB(inode->i_sb);
 182                 unsigned nr_dirty = 1 << (PAGE_SHIFT - inode->i_blkbits);
 183
 184                 nilfs_set_file_dirty(sbi, inode, nr_dirty);
 185         }
 186         return ret;
 187 }
 188
 189 static int nilfs_write_begin(struct file *file, struct address_space *mapping,
 190                              loff_t pos, unsigned len, unsigned flags,
 191                              struct page **pagep, void **fsdata)
 192
 193 {
 194         struct inode *inode = mapping->host;
 195         int err = nilfs_transaction_begin(inode->i_sb, NULL, 1);
 196
 197         if (unlikely(err))
 198                 return err;
 199
 200         *pagep = NULL;
 201         err = block_write_begin(file, mapping, pos, len, flags, pagep,
 202                                 fsdata, nilfs_get_block);
 203         if (unlikely(err))
 204                 nilfs_transaction_abort(inode->i_sb);
 205         return err;
 206 }
 207
 208 static int nilfs_write_end(struct file *file, struct address_space *mapping,
 209                            loff_t pos, unsigned len, unsigned copied,
 210                            struct page *page, void *fsdata)
 211 {
 212         struct inode *inode = mapping->host;
 213         unsigned start = pos & (PAGE_CACHE_SIZE - 1);
 214         unsigned nr_dirty;
 215         int err;
 216
 217         nr_dirty = nilfs_page_count_clean_buffers(page, start,
 218                                                   start + copied);
 219         copied = generic_write_end(file, mapping, pos, len, copied, page,
 220                                    fsdata);
 221         nilfs_set_file_dirty(NILFS_SB(inode->i_sb), inode, nr_dirty);
 222         err = nilfs_transaction_commit(inode->i_sb);
 223         return err ? : copied;
 224 }
 225
 226 static ssize_t
 227 nilfs_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
 228                 loff_t offset, unsigned long nr_segs)
 229 {
 230         struct file *file = iocb->ki_filp;
 231         struct inode *inode = file->f_mapping->host;
 232         ssize_t size;
 233
 234         if (rw == WRITE)
 235                 return 0;
 236
 237         /* Needs synchronization with the cleaner */
 238         size = blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
 239                                   offset, nr_segs, nilfs_get_block, NULL);
 240         return size;
 241 }
 242
 243 const struct address_space_operations nilfs_aops = {
 244         .writepage              = nilfs_writepage,
 245         .readpage               = nilfs_readpage,
 246         .sync_page              = block_sync_page,
 247         .writepages             = nilfs_writepages,
 248         .set_page_dirty         = nilfs_set_page_dirty,
 249         .readpages              = nilfs_readpages,
 250         .write_begin            = nilfs_write_begin,
 251         .write_end              = nilfs_write_end,
 252         /* .releasepage         = nilfs_releasepage, */
 253         .invalidatepage         = block_invalidatepage,
 254         .direct_IO              = nilfs_direct_IO,
 255         .is_partially_uptodate  = block_is_partially_uptodate,
 256 };
 257
 258 struct inode *nilfs_new_inode(struct inode *dir, int mode)
 259 {
 260         struct super_block *sb = dir->i_sb;
 261         struct nilfs_sb_info *sbi = NILFS_SB(sb);
 262         struct inode *inode;
 263         struct nilfs_inode_info *ii;
 264         int err = -ENOMEM;
 265         ino_t ino;
 266
 267         inode = new_inode(sb);
 268         if (unlikely(!inode))
 269                 goto failed;
 270
 271         mapping_set_gfp_mask(inode->i_mapping,
 272                              mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS);
 273
 274         ii = NILFS_I(inode);
 275         ii->i_state = 1 << NILFS_I_NEW;
 276
 277         err = nilfs_ifile_create_inode(sbi->s_ifile, &ino, &ii->i_bh);
 278         if (unlikely(err))
 279                 goto failed_ifile_create_inode;
 280         /* reference count of i_bh inherits from nilfs_mdt_read_block() */
 281
 282         atomic_inc(&sbi->s_inodes_count);
 283
 284         inode->i_uid = current_fsuid();
 285         if (dir->i_mode & S_ISGID) {
 286                 inode->i_gid = dir->i_gid;
 287                 if (S_ISDIR(mode))
 288                         mode |= S_ISGID;
 289         } else
 290                 inode->i_gid = current_fsgid();
 291
 292         inode->i_mode = mode;
 293         inode->i_ino = ino;
 294         inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
 295
 296         if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) {
 297                 err = nilfs_bmap_read(ii->i_bmap, NULL);
 298                 if (err < 0)
 299                         goto failed_bmap;
 300
 301                 set_bit(NILFS_I_BMAP, &ii->i_state);
 302                 /* No lock is needed; iget() ensures it. */
 303         }
 304
 305         ii->i_flags = NILFS_I(dir)->i_flags;
 306         if (S_ISLNK(mode))
 307                 ii->i_flags &= ~(NILFS_IMMUTABLE_FL | NILFS_APPEND_FL);
 308         if (!S_ISDIR(mode))
 309                 ii->i_flags &= ~NILFS_DIRSYNC_FL;
 310
 311         /* ii->i_file_acl = 0; */
 312         /* ii->i_dir_acl = 0; */
 313         ii->i_dir_start_lookup = 0;
 314         ii->i_cno = 0;
 315         nilfs_set_inode_flags(inode);
 316         spin_lock(&sbi->s_next_gen_lock);
 317         inode->i_generation = sbi->s_next_generation++;
 318         spin_unlock(&sbi->s_next_gen_lock);
 319         insert_inode_hash(inode);
 320
 321         err = nilfs_init_acl(inode, dir);
 322         if (unlikely(err))
 323                 goto failed_acl; /* never occur. When supporting
 324                                     nilfs_init_acl(), proper cancellation of
 325                                     above jobs should be considered */
 326
 327         return inode;
 328
 329  failed_acl:
 330  failed_bmap:
 331         inode->i_nlink = 0;
 332         iput(inode);  /* raw_inode will be deleted through
 333                          generic_delete_inode() */
 334         goto failed;
 335
 336  failed_ifile_create_inode:
 337         make_bad_inode(inode);
 338         iput(inode);  /* if i_nlink == 1, generic_forget_inode() will be
 339                          called */
 340  failed:
 341         return ERR_PTR(err);
 342 }
 343
 344 void nilfs_free_inode(struct inode *inode)
 345 {
 346         struct super_block *sb = inode->i_sb;
 347         struct nilfs_sb_info *sbi = NILFS_SB(sb);
 348
 349         clear_inode(inode);
 350         /* XXX: check error code? Is there any thing I can do? */
 351         (void) nilfs_ifile_delete_inode(sbi->s_ifile, inode->i_ino);
 352         atomic_dec(&sbi->s_inodes_count);
 353 }
 354
 355 void nilfs_set_inode_flags(struct inode *inode)
 356 {
 357         unsigned int flags = NILFS_I(inode)->i_flags;
 358
 359         inode->i_flags &= ~(S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME |
 360                             S_DIRSYNC);
 361         if (flags & NILFS_SYNC_FL)
 362                 inode->i_flags |= S_SYNC;
 363         if (flags & NILFS_APPEND_FL)
 364                 inode->i_flags |= S_APPEND;
 365         if (flags & NILFS_IMMUTABLE_FL)
 366                 inode->i_flags |= S_IMMUTABLE;
 367 #ifndef NILFS_ATIME_DISABLE
 368         if (flags & NILFS_NOATIME_FL)
 369 #endif
 370                 inode->i_flags |= S_NOATIME;
 371         if (flags & NILFS_DIRSYNC_FL)
 372                 inode->i_flags |= S_DIRSYNC;
 373         mapping_set_gfp_mask(inode->i_mapping,
 374                              mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS);
 375 }
 376
 377 int nilfs_read_inode_common(struct inode *inode,
 378                             struct nilfs_inode *raw_inode)
 379 {
 380         struct nilfs_inode_info *ii = NILFS_I(inode);
 381         int err;
 382
 383         inode->i_mode = le16_to_cpu(raw_inode->i_mode);
 384         inode->i_uid = (uid_t)le32_to_cpu(raw_inode->i_uid);
 385         inode->i_gid = (gid_t)le32_to_cpu(raw_inode->i_gid);
 386         inode->i_nlink = le16_to_cpu(raw_inode->i_links_count);
 387         inode->i_size = le64_to_cpu(raw_inode->i_size);
 388         inode->i_atime.tv_sec = le64_to_cpu(raw_inode->i_mtime);
 389         inode->i_ctime.tv_sec = le64_to_cpu(raw_inode->i_ctime);
 390         inode->i_mtime.tv_sec = le64_to_cpu(raw_inode->i_mtime);
 391         inode->i_atime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec);
 392         inode->i_ctime.tv_nsec = le32_to_cpu(raw_inode->i_ctime_nsec);
 393         inode->i_mtime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec);
 394         if (inode->i_nlink == 0 && inode->i_mode == 0)
 395                 return -EINVAL; /* this inode is deleted */
 396
 397         inode->i_blocks = le64_to_cpu(raw_inode->i_blocks);
 398         ii->i_flags = le32_to_cpu(raw_inode->i_flags);
 399 #if 0
 400         ii->i_file_acl = le32_to_cpu(raw_inode->i_file_acl);
 401         ii->i_dir_acl = S_ISREG(inode->i_mode) ?
 402                 0 : le32_to_cpu(raw_inode->i_dir_acl);
 403 #endif
 404         ii->i_dir_start_lookup = 0;
 405         ii->i_cno = 0;
 406         inode->i_generation = le32_to_cpu(raw_inode->i_generation);
 407
 408         if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
 409             S_ISLNK(inode->i_mode)) {
 410                 err = nilfs_bmap_read(ii->i_bmap, raw_inode);
 411                 if (err < 0)
 412                         return err;
 413                 set_bit(NILFS_I_BMAP, &ii->i_state);
 414                 /* No lock is needed; iget() ensures it. */
 415         }
 416         return 0;
 417 }
 418
 419 static int __nilfs_read_inode(struct super_block *sb, unsigned long ino,
 420                               struct inode *inode)
 421 {
 422         struct nilfs_sb_info *sbi = NILFS_SB(sb);
 423         struct inode *dat = nilfs_dat_inode(sbi->s_nilfs);
 424         struct buffer_head *bh;
 425         struct nilfs_inode *raw_inode;
 426         int err;
 427
 428         down_read(&NILFS_MDT(dat)->mi_sem);     /* XXX */
 429         err = nilfs_ifile_get_inode_block(sbi->s_ifile, ino, &bh);
 430         if (unlikely(err))
 431                 goto bad_inode;
 432
 433         raw_inode = nilfs_ifile_map_inode(sbi->s_ifile, ino, bh);
 434
 435         err = nilfs_read_inode_common(inode, raw_inode);
 436         if (err)
 437                 goto failed_unmap;
 438
 439         if (S_ISREG(inode->i_mode)) {
 440                 inode->i_op = &nilfs_file_inode_operations;
 441                 inode->i_fop = &nilfs_file_operations;
 442                 inode->i_mapping->a_ops = &nilfs_aops;
 443         } else if (S_ISDIR(inode->i_mode)) {
 444                 inode->i_op = &nilfs_dir_inode_operations;
 445                 inode->i_fop = &nilfs_dir_operations;
 446                 inode->i_mapping->a_ops = &nilfs_aops;
 447         } else if (S_ISLNK(inode->i_mode)) {
 448                 inode->i_op = &nilfs_symlink_inode_operations;
 449                 inode->i_mapping->a_ops = &nilfs_aops;
 450         } else {
 451                 inode->i_op = &nilfs_special_inode_operations;
 452                 init_special_inode(
 453                         inode, inode->i_mode,
 454                         huge_decode_dev(le64_to_cpu(raw_inode->i_device_code)));
 455         }
 456         nilfs_ifile_unmap_inode(sbi->s_ifile, ino, bh);
 457         brelse(bh);
 458         up_read(&NILFS_MDT(dat)->mi_sem);       /* XXX */
 459         nilfs_set_inode_flags(inode);
 460         return 0;
 461
 462  failed_unmap:
 463         nilfs_ifile_unmap_inode(sbi->s_ifile, ino, bh);
 464         brelse(bh);
 465
 466  bad_inode:
 467         up_read(&NILFS_MDT(dat)->mi_sem);       /* XXX */
 468         return err;
 469 }
 470
 471 struct inode *nilfs_iget(struct super_block *sb, unsigned long ino)
 472 {
 473         struct inode *inode;
 474         int err;
 475
 476         inode = iget_locked(sb, ino);
 477         if (unlikely(!inode))
 478                 return ERR_PTR(-ENOMEM);
 479         if (!(inode->i_state & I_NEW))
 480                 return inode;
 481
 482         err = __nilfs_read_inode(sb, ino, inode);
 483         if (unlikely(err)) {
 484                 iget_failed(inode);
 485                 return ERR_PTR(err);
 486         }
 487         unlock_new_inode(inode);
 488         return inode;
 489 }
 490
 491 void nilfs_write_inode_common(struct inode *inode,
 492                               struct nilfs_inode *raw_inode, int has_bmap)
 493 {
 494         struct nilfs_inode_info *ii = NILFS_I(inode);
 495
 496         raw_inode->i_mode = cpu_to_le16(inode->i_mode);
 497         raw_inode->i_uid = cpu_to_le32(inode->i_uid);
 498         raw_inode->i_gid = cpu_to_le32(inode->i_gid);
 499         raw_inode->i_links_count = cpu_to_le16(inode->i_nlink);
 500         raw_inode->i_size = cpu_to_le64(inode->i_size);
 501         raw_inode->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
 502         raw_inode->i_mtime = cpu_to_le64(inode->i_mtime.tv_sec);
 503         raw_inode->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
 504         raw_inode->i_mtime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
 505         raw_inode->i_blocks = cpu_to_le64(inode->i_blocks);
 506
 507         raw_inode->i_flags = cpu_to_le32(ii->i_flags);
 508         raw_inode->i_generation = cpu_to_le32(inode->i_generation);
 509
 510         if (has_bmap)
 511                 nilfs_bmap_write(ii->i_bmap, raw_inode);
 512         else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
 513                 raw_inode->i_device_code =
 514                         cpu_to_le64(huge_encode_dev(inode->i_rdev));
 515         /* When extending inode, nilfs->ns_inode_size should be checked
 516            for substitutions of appended fields */
 517 }
 518
 519 void nilfs_update_inode(struct inode *inode, struct buffer_head *ibh)
 520 {
 521         ino_t ino = inode->i_ino;
 522         struct nilfs_inode_info *ii = NILFS_I(inode);
 523         struct super_block *sb = inode->i_sb;
 524         struct nilfs_sb_info *sbi = NILFS_SB(sb);
 525         struct nilfs_inode *raw_inode;
 526
 527         raw_inode = nilfs_ifile_map_inode(sbi->s_ifile, ino, ibh);
 528
 529         if (test_and_clear_bit(NILFS_I_NEW, &ii->i_state))
 530                 memset(raw_inode, 0, NILFS_MDT(sbi->s_ifile)->mi_entry_size);
 531         set_bit(NILFS_I_INODE_DIRTY, &ii->i_state);
 532
 533         nilfs_write_inode_common(inode, raw_inode, 0);
 534                 /* XXX: call with has_bmap = 0 is a workaround to avoid
 535                    deadlock of bmap. This delays update of i_bmap to just
 536                    before writing */
 537         nilfs_ifile_unmap_inode(sbi->s_ifile, ino, ibh);
 538 }
 539
 540 #define NILFS_MAX_TRUNCATE_BLOCKS       16384  /* 64MB for 4KB block */
 541
 542 static void nilfs_truncate_bmap(struct nilfs_inode_info *ii,
 543                                 unsigned long from)
 544 {
 545         unsigned long b;
 546         int ret;
 547
 548         if (!test_bit(NILFS_I_BMAP, &ii->i_state))
 549                 return;
 550  repeat:
 551         ret = nilfs_bmap_last_key(ii->i_bmap, &b);
 552         if (ret == -ENOENT)
 553                 return;
 554         else if (ret < 0)
 555                 goto failed;
 556
 557         if (b < from)
 558                 return;
 559
 560         b -= min_t(unsigned long, NILFS_MAX_TRUNCATE_BLOCKS, b - from);
 561         ret = nilfs_bmap_truncate(ii->i_bmap, b);
 562         nilfs_relax_pressure_in_lock(ii->vfs_inode.i_sb);
 563         if (!ret || (ret == -ENOMEM &&
 564                      nilfs_bmap_truncate(ii->i_bmap, b) == 0))
 565                 goto repeat;
 566
 567  failed:
 568         if (ret == -EINVAL)
 569                 nilfs_error(ii->vfs_inode.i_sb, __func__,
 570                             "bmap is broken (ino=%lu)", ii->vfs_inode.i_ino);
 571         else
 572                 nilfs_warning(ii->vfs_inode.i_sb, __func__,
 573                               "failed to truncate bmap (ino=%lu, err=%d)",
 574                               ii->vfs_inode.i_ino, ret);
 575 }
 576
 577 void nilfs_truncate(struct inode *inode)
 578 {
 579         unsigned long blkoff;
 580         unsigned int blocksize;
 581         struct nilfs_transaction_info ti;
 582         struct super_block *sb = inode->i_sb;
 583         struct nilfs_inode_info *ii = NILFS_I(inode);
 584
 585         if (!test_bit(NILFS_I_BMAP, &ii->i_state))
 586                 return;
 587         if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
 588                 return;
 589
 590         blocksize = sb->s_blocksize;
 591         blkoff = (inode->i_size + blocksize - 1) >> sb->s_blocksize_bits;
 592         nilfs_transaction_begin(sb, &ti, 0); /* never fails */
 593
 594         block_truncate_page(inode->i_mapping, inode->i_size, nilfs_get_block);
 595
 596         nilfs_truncate_bmap(ii, blkoff);
 597
 598         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
 599         if (IS_SYNC(inode))
 600                 nilfs_set_transaction_flag(NILFS_TI_SYNC);
 601
 602         nilfs_mark_inode_dirty(inode);
 603         nilfs_set_file_dirty(NILFS_SB(sb), inode, 0);
 604         nilfs_transaction_commit(sb);
 605         /* May construct a logical segment and may fail in sync mode.
 606            But truncate has no return value. */
 607 }
 608
 609 void nilfs_delete_inode(struct inode *inode)
 610 {
 611         struct nilfs_transaction_info ti;
 612         struct super_block *sb = inode->i_sb;
 613         struct nilfs_inode_info *ii = NILFS_I(inode);
 614
 615         if (unlikely(is_bad_inode(inode))) {
 616                 if (inode->i_data.nrpages)
 617                         truncate_inode_pages(&inode->i_data, 0);
 618                 clear_inode(inode);
 619                 return;
 620         }
 621         nilfs_transaction_begin(sb, &ti, 0); /* never fails */
 622
 623         if (inode->i_data.nrpages)
 624                 truncate_inode_pages(&inode->i_data, 0);
 625
 626         nilfs_truncate_bmap(ii, 0);
 627         nilfs_mark_inode_dirty(inode);
 628         nilfs_free_inode(inode);
 629         /* nilfs_free_inode() marks inode buffer dirty */
 630         if (IS_SYNC(inode))
 631                 nilfs_set_transaction_flag(NILFS_TI_SYNC);
 632         nilfs_transaction_commit(sb);
 633         /* May construct a logical segment and may fail in sync mode.
 634            But delete_inode has no return value. */
 635 }
 636
 637 int nilfs_setattr(struct dentry *dentry, struct iattr *iattr)
 638 {
 639         struct nilfs_transaction_info ti;
 640         struct inode *inode = dentry->d_inode;
 641         struct super_block *sb = inode->i_sb;
 642         int err;
 643
 644         err = inode_change_ok(inode, iattr);
 645         if (err)
 646                 return err;
 647
 648         err = nilfs_transaction_begin(sb, &ti, 0);
 649         if (unlikely(err))
 650                 return err;
 651         err = inode_setattr(inode, iattr);
 652         if (!err && (iattr->ia_valid & ATTR_MODE))
 653                 err = nilfs_acl_chmod(inode);
 654         if (likely(!err))
 655                 err = nilfs_transaction_commit(sb);
 656         else
 657                 nilfs_transaction_abort(sb);
 658
 659         return err;
 660 }
 661
 662 int nilfs_load_inode_block(struct nilfs_sb_info *sbi, struct inode *inode,
 663                            struct buffer_head **pbh)
 664 {
 665         struct nilfs_inode_info *ii = NILFS_I(inode);
 666         int err;
 667
 668         spin_lock(&sbi->s_inode_lock);
 669         if (ii->i_bh == NULL) {
 670                 spin_unlock(&sbi->s_inode_lock);
 671                 err = nilfs_ifile_get_inode_block(sbi->s_ifile, inode->i_ino,
 672                                                   pbh);
 673                 if (unlikely(err))
 674                         return err;
 675                 spin_lock(&sbi->s_inode_lock);
 676                 if (ii->i_bh == NULL)
 677                         ii->i_bh = *pbh;
 678                 else {
 679                         brelse(*pbh);
 680                         *pbh = ii->i_bh;
 681                 }
 682         } else
 683                 *pbh = ii->i_bh;
 684
 685         get_bh(*pbh);
 686         spin_unlock(&sbi->s_inode_lock);
 687         return 0;
 688 }
 689
 690 int nilfs_inode_dirty(struct inode *inode)
 691 {
 692         struct nilfs_inode_info *ii = NILFS_I(inode);
 693         struct nilfs_sb_info *sbi = NILFS_SB(inode->i_sb);
 694         int ret = 0;
 695
 696         if (!list_empty(&ii->i_dirty)) {
 697                 spin_lock(&sbi->s_inode_lock);
 698                 ret = test_bit(NILFS_I_DIRTY, &ii->i_state) ||
 699                         test_bit(NILFS_I_BUSY, &ii->i_state);
 700                 spin_unlock(&sbi->s_inode_lock);
 701         }
 702         return ret;
 703 }
 704
 705 int nilfs_set_file_dirty(struct nilfs_sb_info *sbi, struct inode *inode,
 706                          unsigned nr_dirty)
 707 {
 708         struct nilfs_inode_info *ii = NILFS_I(inode);
 709
 710         atomic_add(nr_dirty, &sbi->s_nilfs->ns_ndirtyblks);
 711
 712         if (test_and_set_bit(NILFS_I_DIRTY, &ii->i_state))
 713                 return 0;
 714
 715         spin_lock(&sbi->s_inode_lock);
 716         if (!test_bit(NILFS_I_QUEUED, &ii->i_state) &&
 717             !test_bit(NILFS_I_BUSY, &ii->i_state)) {
 718                 /* Because this routine may race with nilfs_dispose_list(),
 719                    we have to check NILFS_I_QUEUED here, too. */
 720                 if (list_empty(&ii->i_dirty) && igrab(inode) == NULL) {
 721                         /* This will happen when somebody is freeing
 722                            this inode. */
 723                         nilfs_warning(sbi->s_super, __func__,
 724                                       "cannot get inode (ino=%lu)\n",
 725                                       inode->i_ino);
 726                         spin_unlock(&sbi->s_inode_lock);
 727                         return -EINVAL; /* NILFS_I_DIRTY may remain for
 728                                            freeing inode */
 729                 }
 730                 list_del(&ii->i_dirty);
 731                 list_add_tail(&ii->i_dirty, &sbi->s_dirty_files);
 732                 set_bit(NILFS_I_QUEUED, &ii->i_state);
 733         }
 734         spin_unlock(&sbi->s_inode_lock);
 735         return 0;
 736 }
 737
 738 int nilfs_mark_inode_dirty(struct inode *inode)
 739 {
 740         struct nilfs_sb_info *sbi = NILFS_SB(inode->i_sb);
 741         struct buffer_head *ibh;
 742         int err;
 743
 744         err = nilfs_load_inode_block(sbi, inode, &ibh);
 745         if (unlikely(err)) {
 746                 nilfs_warning(inode->i_sb, __func__,
 747                               "failed to reget inode block.\n");
 748                 return err;
 749         }
 750         nilfs_update_inode(inode, ibh);
 751         nilfs_mdt_mark_buffer_dirty(ibh);
 752         nilfs_mdt_mark_dirty(sbi->s_ifile);
 753         brelse(ibh);
 754         return 0;
 755 }
 756
 757 /**
 758  * nilfs_dirty_inode - reflect changes on given inode to an inode block.
 759  * @inode: inode of the file to be registered.
 760  *
 761  * nilfs_dirty_inode() loads a inode block containing the specified
 762  * @inode and copies data from a nilfs_inode to a corresponding inode
 763  * entry in the inode block. This operation is excluded from the segment
 764  * construction. This function can be called both as a single operation
 765  * and as a part of indivisible file operations.
 766  */
 767 void nilfs_dirty_inode(struct inode *inode)
 768 {
 769         struct nilfs_transaction_info ti;
 770
 771         if (is_bad_inode(inode)) {
 772                 nilfs_warning(inode->i_sb, __func__,
 773                               "tried to mark bad_inode dirty. ignored.\n");
 774                 dump_stack();
 775                 return;
 776         }
 777         nilfs_transaction_begin(inode->i_sb, &ti, 0);
 778         nilfs_mark_inode_dirty(inode);
 779         nilfs_transaction_commit(inode->i_sb); /* never fails */
 780 }