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   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_mark_inode_dirty(inode);
 101                 nilfs_transaction_commit(inode->i_sb); /* never fails */
 102                 /* Error handling should be detailed */
 103                 set_buffer_new(bh_result);
 104                 map_bh(bh_result, inode->i_sb, 0); /* dbn must be changed
 105                                                       to proper value */
 106         } else if (ret == -ENOENT) {
 107                 /* not found is not error (e.g. hole); must return without
 108                    the mapped state flag. */
 109                 ;
 110         } else {
 111                 err = ret;
 112         }
 113
 114  out:
 115         return err;
 116 }
 117
 118 /**
 119  * nilfs_readpage() - implement readpage() method of nilfs_aops {}
 120  * address_space_operations.
 121  * @file - file struct of the file to be read
 122  * @page - the page to be read
 123  */
 124 static int nilfs_readpage(struct file *file, struct page *page)
 125 {
 126         return mpage_readpage(page, nilfs_get_block);
 127 }
 128
 129 /**
 130  * nilfs_readpages() - implement readpages() method of nilfs_aops {}
 131  * address_space_operations.
 132  * @file - file struct of the file to be read
 133  * @mapping - address_space struct used for reading multiple pages
 134  * @pages - the pages to be read
 135  * @nr_pages - number of pages to be read
 136  */
 137 static int nilfs_readpages(struct file *file, struct address_space *mapping,
 138                            struct list_head *pages, unsigned nr_pages)
 139 {
 140         return mpage_readpages(mapping, pages, nr_pages, nilfs_get_block);
 141 }
 142
 143 static int nilfs_writepages(struct address_space *mapping,
 144                             struct writeback_control *wbc)
 145 {
 146         struct inode *inode = mapping->host;
 147         int err = 0;
 148
 149         if (wbc->sync_mode == WB_SYNC_ALL)
 150                 err = nilfs_construct_dsync_segment(inode->i_sb, inode,
 151                                                     wbc->range_start,
 152                                                     wbc->range_end);
 153         return err;
 154 }
 155
 156 static int nilfs_writepage(struct page *page, struct writeback_control *wbc)
 157 {
 158         struct inode *inode = page->mapping->host;
 159         int err;
 160
 161         redirty_page_for_writepage(wbc, page);
 162         unlock_page(page);
 163
 164         if (wbc->sync_mode == WB_SYNC_ALL) {
 165                 err = nilfs_construct_segment(inode->i_sb);
 166                 if (unlikely(err))
 167                         return err;
 168         } else if (wbc->for_reclaim)
 169                 nilfs_flush_segment(inode->i_sb, inode->i_ino);
 170
 171         return 0;
 172 }
 173
 174 static int nilfs_set_page_dirty(struct page *page)
 175 {
 176         int ret = __set_page_dirty_buffers(page);
 177
 178         if (ret) {
 179                 struct inode *inode = page->mapping->host;
 180                 struct nilfs_sb_info *sbi = NILFS_SB(inode->i_sb);
 181                 unsigned nr_dirty = 1 << (PAGE_SHIFT - inode->i_blkbits);
 182
 183                 nilfs_set_file_dirty(sbi, inode, nr_dirty);
 184         }
 185         return ret;
 186 }
 187
 188 static int nilfs_write_begin(struct file *file, struct address_space *mapping,
 189                              loff_t pos, unsigned len, unsigned flags,
 190                              struct page **pagep, void **fsdata)
 191
 192 {
 193         struct inode *inode = mapping->host;
 194         int err = nilfs_transaction_begin(inode->i_sb, NULL, 1);
 195
 196         if (unlikely(err))
 197                 return err;
 198
 199         *pagep = NULL;
 200         err = block_write_begin(file, mapping, pos, len, flags, pagep,
 201                                 fsdata, nilfs_get_block);
 202         if (unlikely(err))
 203                 nilfs_transaction_abort(inode->i_sb);
 204         return err;
 205 }
 206
 207 static int nilfs_write_end(struct file *file, struct address_space *mapping,
 208                            loff_t pos, unsigned len, unsigned copied,
 209                            struct page *page, void *fsdata)
 210 {
 211         struct inode *inode = mapping->host;
 212         unsigned start = pos & (PAGE_CACHE_SIZE - 1);
 213         unsigned nr_dirty;
 214         int err;
 215
 216         nr_dirty = nilfs_page_count_clean_buffers(page, start,
 217                                                   start + copied);
 218         copied = generic_write_end(file, mapping, pos, len, copied, page,
 219                                    fsdata);
 220         nilfs_set_file_dirty(NILFS_SB(inode->i_sb), inode, nr_dirty);
 221         err = nilfs_transaction_commit(inode->i_sb);
 222         return err ? : copied;
 223 }
 224
 225 static ssize_t
 226 nilfs_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
 227                 loff_t offset, unsigned long nr_segs)
 228 {
 229         struct file *file = iocb->ki_filp;
 230         struct inode *inode = file->f_mapping->host;
 231         ssize_t size;
 232
 233         if (rw == WRITE)
 234                 return 0;
 235
 236         /* Needs synchronization with the cleaner */
 237         size = blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
 238                                   offset, nr_segs, nilfs_get_block, NULL);
 239         return size;
 240 }
 241
 242 const struct address_space_operations nilfs_aops = {
 243         .writepage              = nilfs_writepage,
 244         .readpage               = nilfs_readpage,
 245         .sync_page              = block_sync_page,
 246         .writepages             = nilfs_writepages,
 247         .set_page_dirty         = nilfs_set_page_dirty,
 248         .readpages              = nilfs_readpages,
 249         .write_begin            = nilfs_write_begin,
 250         .write_end              = nilfs_write_end,
 251         /* .releasepage         = nilfs_releasepage, */
 252         .invalidatepage         = block_invalidatepage,
 253         .direct_IO              = nilfs_direct_IO,
 254         .is_partially_uptodate  = block_is_partially_uptodate,
 255 };
 256
 257 struct inode *nilfs_new_inode(struct inode *dir, int mode)
 258 {
 259         struct super_block *sb = dir->i_sb;
 260         struct nilfs_sb_info *sbi = NILFS_SB(sb);
 261         struct inode *inode;
 262         struct nilfs_inode_info *ii;
 263         int err = -ENOMEM;
 264         ino_t ino;
 265
 266         inode = new_inode(sb);
 267         if (unlikely(!inode))
 268                 goto failed;
 269
 270         mapping_set_gfp_mask(inode->i_mapping,
 271                              mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS);
 272
 273         ii = NILFS_I(inode);
 274         ii->i_state = 1 << NILFS_I_NEW;
 275
 276         err = nilfs_ifile_create_inode(sbi->s_ifile, &ino, &ii->i_bh);
 277         if (unlikely(err))
 278                 goto failed_ifile_create_inode;
 279         /* reference count of i_bh inherits from nilfs_mdt_read_block() */
 280
 281         atomic_inc(&sbi->s_inodes_count);
 282
 283         inode->i_uid = current_fsuid();
 284         if (dir->i_mode & S_ISGID) {
 285                 inode->i_gid = dir->i_gid;
 286                 if (S_ISDIR(mode))
 287                         mode |= S_ISGID;
 288         } else
 289                 inode->i_gid = current_fsgid();
 290
 291         inode->i_mode = mode;
 292         inode->i_ino = ino;
 293         inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
 294
 295         if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) {
 296                 err = nilfs_bmap_read(ii->i_bmap, NULL);
 297                 if (err < 0)
 298                         goto failed_bmap;
 299
 300                 set_bit(NILFS_I_BMAP, &ii->i_state);
 301                 /* No lock is needed; iget() ensures it. */
 302         }
 303
 304         ii->i_flags = NILFS_I(dir)->i_flags;
 305         if (S_ISLNK(mode))
 306                 ii->i_flags &= ~(NILFS_IMMUTABLE_FL | NILFS_APPEND_FL);
 307         if (!S_ISDIR(mode))
 308                 ii->i_flags &= ~NILFS_DIRSYNC_FL;
 309
 310         /* ii->i_file_acl = 0; */
 311         /* ii->i_dir_acl = 0; */
 312         ii->i_dir_start_lookup = 0;
 313         ii->i_cno = 0;
 314         nilfs_set_inode_flags(inode);
 315         spin_lock(&sbi->s_next_gen_lock);
 316         inode->i_generation = sbi->s_next_generation++;
 317         spin_unlock(&sbi->s_next_gen_lock);
 318         insert_inode_hash(inode);
 319
 320         err = nilfs_init_acl(inode, dir);
 321         if (unlikely(err))
 322                 goto failed_acl; /* never occur. When supporting
 323                                     nilfs_init_acl(), proper cancellation of
 324                                     above jobs should be considered */
 325
 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         if (test_and_clear_bit(NILFS_I_NEW, &ii->i_state))
 529                 memset(raw_inode, 0, NILFS_MDT(sbi->s_ifile)->mi_entry_size);
 530         set_bit(NILFS_I_INODE_DIRTY, &ii->i_state);
 531
 532         nilfs_write_inode_common(inode, raw_inode, 0);
 533                 /* XXX: call with has_bmap = 0 is a workaround to avoid
 534                    deadlock of bmap. This delays update of i_bmap to just
 535                    before writing */
 536         nilfs_ifile_unmap_inode(sbi->s_ifile, ino, ibh);
 537 }
 538
 539 #define NILFS_MAX_TRUNCATE_BLOCKS       16384  /* 64MB for 4KB block */
 540
 541 static void nilfs_truncate_bmap(struct nilfs_inode_info *ii,
 542                                 unsigned long from)
 543 {
 544         unsigned long b;
 545         int ret;
 546
 547         if (!test_bit(NILFS_I_BMAP, &ii->i_state))
 548                 return;
 549  repeat:
 550         ret = nilfs_bmap_last_key(ii->i_bmap, &b);
 551         if (ret == -ENOENT)
 552                 return;
 553         else if (ret < 0)
 554                 goto failed;
 555
 556         if (b < from)
 557                 return;
 558
 559         b -= min_t(unsigned long, NILFS_MAX_TRUNCATE_BLOCKS, b - from);
 560         ret = nilfs_bmap_truncate(ii->i_bmap, b);
 561         nilfs_relax_pressure_in_lock(ii->vfs_inode.i_sb);
 562         if (!ret || (ret == -ENOMEM &&
 563                      nilfs_bmap_truncate(ii->i_bmap, b) == 0))
 564                 goto repeat;
 565
 566  failed:
 567         if (ret == -EINVAL)
 568                 nilfs_error(ii->vfs_inode.i_sb, __func__,
 569                             "bmap is broken (ino=%lu)", ii->vfs_inode.i_ino);
 570         else
 571                 nilfs_warning(ii->vfs_inode.i_sb, __func__,
 572                               "failed to truncate bmap (ino=%lu, err=%d)",
 573                               ii->vfs_inode.i_ino, ret);
 574 }
 575
 576 void nilfs_truncate(struct inode *inode)
 577 {
 578         unsigned long blkoff;
 579         unsigned int blocksize;
 580         struct nilfs_transaction_info ti;
 581         struct super_block *sb = inode->i_sb;
 582         struct nilfs_inode_info *ii = NILFS_I(inode);
 583
 584         if (!test_bit(NILFS_I_BMAP, &ii->i_state))
 585                 return;
 586         if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
 587                 return;
 588
 589         blocksize = sb->s_blocksize;
 590         blkoff = (inode->i_size + blocksize - 1) >> sb->s_blocksize_bits;
 591         nilfs_transaction_begin(sb, &ti, 0); /* never fails */
 592
 593         block_truncate_page(inode->i_mapping, inode->i_size, nilfs_get_block);
 594
 595         nilfs_truncate_bmap(ii, blkoff);
 596
 597         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
 598         if (IS_SYNC(inode))
 599                 nilfs_set_transaction_flag(NILFS_TI_SYNC);
 600
 601         nilfs_mark_inode_dirty(inode);
 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_mark_inode_dirty(inode);
 627         nilfs_free_inode(inode);
 628         /* nilfs_free_inode() marks inode buffer dirty */
 629         if (IS_SYNC(inode))
 630                 nilfs_set_transaction_flag(NILFS_TI_SYNC);
 631         nilfs_transaction_commit(sb);
 632         /* May construct a logical segment and may fail in sync mode.
 633            But delete_inode has no return value. */
 634 }
 635
 636 int nilfs_setattr(struct dentry *dentry, struct iattr *iattr)
 637 {
 638         struct nilfs_transaction_info ti;
 639         struct inode *inode = dentry->d_inode;
 640         struct super_block *sb = inode->i_sb;
 641         int err;
 642
 643         err = inode_change_ok(inode, iattr);
 644         if (err)
 645                 return err;
 646
 647         err = nilfs_transaction_begin(sb, &ti, 0);
 648         if (unlikely(err))
 649                 return err;
 650         err = inode_setattr(inode, iattr);
 651         if (!err && (iattr->ia_valid & ATTR_MODE))
 652                 err = nilfs_acl_chmod(inode);
 653         if (likely(!err))
 654                 err = nilfs_transaction_commit(sb);
 655         else
 656                 nilfs_transaction_abort(sb);
 657
 658         return err;
 659 }
 660
 661 int nilfs_load_inode_block(struct nilfs_sb_info *sbi, struct inode *inode,
 662                            struct buffer_head **pbh)
 663 {
 664         struct nilfs_inode_info *ii = NILFS_I(inode);
 665         int err;
 666
 667         spin_lock(&sbi->s_inode_lock);
 668         if (ii->i_bh == NULL) {
 669                 spin_unlock(&sbi->s_inode_lock);
 670                 err = nilfs_ifile_get_inode_block(sbi->s_ifile, inode->i_ino,
 671                                                   pbh);
 672                 if (unlikely(err))
 673                         return err;
 674                 spin_lock(&sbi->s_inode_lock);
 675                 if (ii->i_bh == NULL)
 676                         ii->i_bh = *pbh;
 677                 else {
 678                         brelse(*pbh);
 679                         *pbh = ii->i_bh;
 680                 }
 681         } else
 682                 *pbh = ii->i_bh;
 683
 684         get_bh(*pbh);
 685         spin_unlock(&sbi->s_inode_lock);
 686         return 0;
 687 }
 688
 689 int nilfs_inode_dirty(struct inode *inode)
 690 {
 691         struct nilfs_inode_info *ii = NILFS_I(inode);
 692         struct nilfs_sb_info *sbi = NILFS_SB(inode->i_sb);
 693         int ret = 0;
 694
 695         if (!list_empty(&ii->i_dirty)) {
 696                 spin_lock(&sbi->s_inode_lock);
 697                 ret = test_bit(NILFS_I_DIRTY, &ii->i_state) ||
 698                         test_bit(NILFS_I_BUSY, &ii->i_state);
 699                 spin_unlock(&sbi->s_inode_lock);
 700         }
 701         return ret;
 702 }
 703
 704 int nilfs_set_file_dirty(struct nilfs_sb_info *sbi, struct inode *inode,
 705                          unsigned nr_dirty)
 706 {
 707         struct nilfs_inode_info *ii = NILFS_I(inode);
 708
 709         atomic_add(nr_dirty, &sbi->s_nilfs->ns_ndirtyblks);
 710
 711         if (test_and_set_bit(NILFS_I_DIRTY, &ii->i_state))
 712                 return 0;
 713
 714         spin_lock(&sbi->s_inode_lock);
 715         if (!test_bit(NILFS_I_QUEUED, &ii->i_state) &&
 716             !test_bit(NILFS_I_BUSY, &ii->i_state)) {
 717                 /* Because this routine may race with nilfs_dispose_list(),
 718                    we have to check NILFS_I_QUEUED here, too. */
 719                 if (list_empty(&ii->i_dirty) && igrab(inode) == NULL) {
 720                         /* This will happen when somebody is freeing
 721                            this inode. */
 722                         nilfs_warning(sbi->s_super, __func__,
 723                                       "cannot get inode (ino=%lu)\n",
 724                                       inode->i_ino);
 725                         spin_unlock(&sbi->s_inode_lock);
 726                         return -EINVAL; /* NILFS_I_DIRTY may remain for
 727                                            freeing inode */
 728                 }
 729                 list_del(&ii->i_dirty);
 730                 list_add_tail(&ii->i_dirty, &sbi->s_dirty_files);
 731                 set_bit(NILFS_I_QUEUED, &ii->i_state);
 732         }
 733         spin_unlock(&sbi->s_inode_lock);
 734         return 0;
 735 }
 736
 737 int nilfs_mark_inode_dirty(struct inode *inode)
 738 {
 739         struct nilfs_sb_info *sbi = NILFS_SB(inode->i_sb);
 740         struct buffer_head *ibh;
 741         int err;
 742
 743         err = nilfs_load_inode_block(sbi, inode, &ibh);
 744         if (unlikely(err)) {
 745                 nilfs_warning(inode->i_sb, __func__,
 746                               "failed to reget inode block.\n");
 747                 return err;
 748         }
 749         nilfs_update_inode(inode, ibh);
 750         nilfs_mdt_mark_buffer_dirty(ibh);
 751         nilfs_mdt_mark_dirty(sbi->s_ifile);
 752         brelse(ibh);
 753         return 0;
 754 }
 755
 756 /**
 757  * nilfs_dirty_inode - reflect changes on given inode to an inode block.
 758  * @inode: inode of the file to be registered.
 759  *
 760  * nilfs_dirty_inode() loads a inode block containing the specified
 761  * @inode and copies data from a nilfs_inode to a corresponding inode
 762  * entry in the inode block. This operation is excluded from the segment
 763  * construction. This function can be called both as a single operation
 764  * and as a part of indivisible file operations.
 765  */
 766 void nilfs_dirty_inode(struct inode *inode)
 767 {
 768         struct nilfs_transaction_info ti;
 769
 770         if (is_bad_inode(inode)) {
 771                 nilfs_warning(inode->i_sb, __func__,
 772                               "tried to mark bad_inode dirty. ignored.\n");
 773                 dump_stack();
 774                 return;
 775         }
 776         nilfs_transaction_begin(inode->i_sb, &ti, 0);
 777         nilfs_mark_inode_dirty(inode);
 778         nilfs_transaction_commit(inode->i_sb); /* never fails */
 779 }