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