fs/ocfs2/file.c

   1 /* -*- mode: c; c-basic-offset: 8; -*-
   2  * vim: noexpandtab sw=8 ts=8 sts=0:
   3  *
   4  * file.c
   5  *
   6  * File open, close, extend, truncate
   7  *
   8  * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public
  12  * License as published by the Free Software Foundation; either
  13  * version 2 of the License, or (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public
  21  * License along with this program; if not, write to the
  22  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  23  * Boston, MA 021110-1307, USA.
  24  */
  25
  26 #include <linux/capability.h>
  27 #include <linux/fs.h>
  28 #include <linux/types.h>
  29 #include <linux/slab.h>
  30 #include <linux/highmem.h>
  31 #include <linux/pagemap.h>
  32 #include <linux/uio.h>
  33 #include <linux/sched.h>
  34 #include <linux/splice.h>
  35 #include <linux/mount.h>
  36 #include <linux/writeback.h>
  37 #include <linux/falloc.h>
  38 #include <linux/quotaops.h>
  39
  40 #define MLOG_MASK_PREFIX ML_INODE
  41 #include <cluster/masklog.h>
  42
  43 #include "ocfs2.h"
  44
  45 #include "alloc.h"
  46 #include "aops.h"
  47 #include "dir.h"
  48 #include "dlmglue.h"
  49 #include "extent_map.h"
  50 #include "file.h"
  51 #include "sysfile.h"
  52 #include "inode.h"
  53 #include "ioctl.h"
  54 #include "journal.h"
  55 #include "locks.h"
  56 #include "mmap.h"
  57 #include "suballoc.h"
  58 #include "super.h"
  59 #include "xattr.h"
  60 #include "acl.h"
  61 #include "quota.h"
  62 #include "refcounttree.h"
  63
  64 #include "buffer_head_io.h"
  65
  66 static int ocfs2_sync_inode(struct inode *inode)
  67 {
  68         filemap_fdatawrite(inode->i_mapping);
  69         return sync_mapping_buffers(inode->i_mapping);
  70 }
  71
  72 static int ocfs2_init_file_private(struct inode *inode, struct file *file)
  73 {
  74         struct ocfs2_file_private *fp;
  75
  76         fp = kzalloc(sizeof(struct ocfs2_file_private), GFP_KERNEL);
  77         if (!fp)
  78                 return -ENOMEM;
  79
  80         fp->fp_file = file;
  81         mutex_init(&fp->fp_mutex);
  82         ocfs2_file_lock_res_init(&fp->fp_flock, fp);
  83         file->private_data = fp;
  84
  85         return 0;
  86 }
  87
  88 static void ocfs2_free_file_private(struct inode *inode, struct file *file)
  89 {
  90         struct ocfs2_file_private *fp = file->private_data;
  91         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
  92
  93         if (fp) {
  94                 ocfs2_simple_drop_lockres(osb, &fp->fp_flock);
  95                 ocfs2_lock_res_free(&fp->fp_flock);
  96                 kfree(fp);
  97                 file->private_data = NULL;
  98         }
  99 }
 100
 101 static int ocfs2_file_open(struct inode *inode, struct file *file)
 102 {
 103         int status;
 104         int mode = file->f_flags;
 105         struct ocfs2_inode_info *oi = OCFS2_I(inode);
 106
 107         mlog_entry("(0x%p, 0x%p, '%.*s')\n", inode, file,
 108                    file->f_path.dentry->d_name.len, file->f_path.dentry->d_name.name);
 109
 110         if (file->f_mode & FMODE_WRITE)
 111                 dquot_initialize(inode);
 112
 113         spin_lock(&oi->ip_lock);
 114
 115         /* Check that the inode hasn't been wiped from disk by another
 116          * node. If it hasn't then we're safe as long as we hold the
 117          * spin lock until our increment of open count. */
 118         if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_DELETED) {
 119                 spin_unlock(&oi->ip_lock);
 120
 121                 status = -ENOENT;
 122                 goto leave;
 123         }
 124
 125         if (mode & O_DIRECT)
 126                 oi->ip_flags |= OCFS2_INODE_OPEN_DIRECT;
 127
 128         oi->ip_open_count++;
 129         spin_unlock(&oi->ip_lock);
 130
 131         status = ocfs2_init_file_private(inode, file);
 132         if (status) {
 133                 /*
 134                  * We want to set open count back if we're failing the
 135                  * open.
 136                  */
 137                 spin_lock(&oi->ip_lock);
 138                 oi->ip_open_count--;
 139                 spin_unlock(&oi->ip_lock);
 140         }
 141
 142 leave:
 143         mlog_exit(status);
 144         return status;
 145 }
 146
 147 static int ocfs2_file_release(struct inode *inode, struct file *file)
 148 {
 149         struct ocfs2_inode_info *oi = OCFS2_I(inode);
 150
 151         mlog_entry("(0x%p, 0x%p, '%.*s')\n", inode, file,
 152                        file->f_path.dentry->d_name.len,
 153                        file->f_path.dentry->d_name.name);
 154
 155         spin_lock(&oi->ip_lock);
 156         if (!--oi->ip_open_count)
 157                 oi->ip_flags &= ~OCFS2_INODE_OPEN_DIRECT;
 158         spin_unlock(&oi->ip_lock);
 159
 160         ocfs2_free_file_private(inode, file);
 161
 162         mlog_exit(0);
 163
 164         return 0;
 165 }
 166
 167 static int ocfs2_dir_open(struct inode *inode, struct file *file)
 168 {
 169         return ocfs2_init_file_private(inode, file);
 170 }
 171
 172 static int ocfs2_dir_release(struct inode *inode, struct file *file)
 173 {
 174         ocfs2_free_file_private(inode, file);
 175         return 0;
 176 }
 177
 178 static int ocfs2_sync_file(struct file *file,
 179                            struct dentry *dentry,
 180                            int datasync)
 181 {
 182         int err = 0;
 183         journal_t *journal;
 184         struct inode *inode = dentry->d_inode;
 185         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 186
 187         mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", file, dentry, datasync,
 188                    dentry->d_name.len, dentry->d_name.name);
 189
 190         err = ocfs2_sync_inode(dentry->d_inode);
 191         if (err)
 192                 goto bail;
 193
 194         if (datasync && !(inode->i_state & I_DIRTY_DATASYNC))
 195                 goto bail;
 196
 197         journal = osb->journal->j_journal;
 198         err = jbd2_journal_force_commit(journal);
 199
 200 bail:
 201         mlog_exit(err);
 202
 203         return (err < 0) ? -EIO : 0;
 204 }
 205
 206 int ocfs2_should_update_atime(struct inode *inode,
 207                               struct vfsmount *vfsmnt)
 208 {
 209         struct timespec now;
 210         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 211
 212         if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
 213                 return 0;
 214
 215         if ((inode->i_flags & S_NOATIME) ||
 216             ((inode->i_sb->s_flags & MS_NODIRATIME) && S_ISDIR(inode->i_mode)))
 217                 return 0;
 218
 219         /*
 220          * We can be called with no vfsmnt structure - NFSD will
 221          * sometimes do this.
 222          *
 223          * Note that our action here is different than touch_atime() -
 224          * if we can't tell whether this is a noatime mount, then we
 225          * don't know whether to trust the value of s_atime_quantum.
 226          */
 227         if (vfsmnt == NULL)
 228                 return 0;
 229
 230         if ((vfsmnt->mnt_flags & MNT_NOATIME) ||
 231             ((vfsmnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
 232                 return 0;
 233
 234         if (vfsmnt->mnt_flags & MNT_RELATIME) {
 235                 if ((timespec_compare(&inode->i_atime, &inode->i_mtime) <= 0) ||
 236                     (timespec_compare(&inode->i_atime, &inode->i_ctime) <= 0))
 237                         return 1;
 238
 239                 return 0;
 240         }
 241
 242         now = CURRENT_TIME;
 243         if ((now.tv_sec - inode->i_atime.tv_sec <= osb->s_atime_quantum))
 244                 return 0;
 245         else
 246                 return 1;
 247 }
 248
 249 int ocfs2_update_inode_atime(struct inode *inode,
 250                              struct buffer_head *bh)
 251 {
 252         int ret;
 253         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 254         handle_t *handle;
 255         struct ocfs2_dinode *di = (struct ocfs2_dinode *) bh->b_data;
 256
 257         mlog_entry_void();
 258
 259         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
 260         if (IS_ERR(handle)) {
 261                 ret = PTR_ERR(handle);
 262                 mlog_errno(ret);
 263                 goto out;
 264         }
 265
 266         ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), bh,
 267                                       OCFS2_JOURNAL_ACCESS_WRITE);
 268         if (ret) {
 269                 mlog_errno(ret);
 270                 goto out_commit;
 271         }
 272
 273         /*
 274          * Don't use ocfs2_mark_inode_dirty() here as we don't always
 275          * have i_mutex to guard against concurrent changes to other
 276          * inode fields.
 277          */
 278         inode->i_atime = CURRENT_TIME;
 279         di->i_atime = cpu_to_le64(inode->i_atime.tv_sec);
 280         di->i_atime_nsec = cpu_to_le32(inode->i_atime.tv_nsec);
 281
 282         ret = ocfs2_journal_dirty(handle, bh);
 283         if (ret < 0)
 284                 mlog_errno(ret);
 285
 286 out_commit:
 287         ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
 288 out:
 289         mlog_exit(ret);
 290         return ret;
 291 }
 292
 293 static int ocfs2_set_inode_size(handle_t *handle,
 294                                 struct inode *inode,
 295                                 struct buffer_head *fe_bh,
 296                                 u64 new_i_size)
 297 {
 298         int status;
 299
 300         mlog_entry_void();
 301         i_size_write(inode, new_i_size);
 302         inode->i_blocks = ocfs2_inode_sector_count(inode);
 303         inode->i_ctime = inode->i_mtime = CURRENT_TIME;
 304
 305         status = ocfs2_mark_inode_dirty(handle, inode, fe_bh);
 306         if (status < 0) {
 307                 mlog_errno(status);
 308                 goto bail;
 309         }
 310
 311 bail:
 312         mlog_exit(status);
 313         return status;
 314 }
 315
 316 int ocfs2_simple_size_update(struct inode *inode,
 317                              struct buffer_head *di_bh,
 318                              u64 new_i_size)
 319 {
 320         int ret;
 321         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 322         handle_t *handle = NULL;
 323
 324         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
 325         if (IS_ERR(handle)) {
 326                 ret = PTR_ERR(handle);
 327                 mlog_errno(ret);
 328                 goto out;
 329         }
 330
 331         ret = ocfs2_set_inode_size(handle, inode, di_bh,
 332                                    new_i_size);
 333         if (ret < 0)
 334                 mlog_errno(ret);
 335
 336         ocfs2_commit_trans(osb, handle);
 337 out:
 338         return ret;
 339 }
 340
 341 static int ocfs2_cow_file_pos(struct inode *inode,
 342                               struct buffer_head *fe_bh,
 343                               u64 offset)
 344 {
 345         int status;
 346         u32 phys, cpos = offset >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
 347         unsigned int num_clusters = 0;
 348         unsigned int ext_flags = 0;
 349
 350         /*
 351          * If the new offset is aligned to the range of the cluster, there is
 352          * no space for ocfs2_zero_range_for_truncate to fill, so no need to
 353          * CoW either.
 354          */
 355         if ((offset & (OCFS2_SB(inode->i_sb)->s_clustersize - 1)) == 0)
 356                 return 0;
 357
 358         status = ocfs2_get_clusters(inode, cpos, &phys,
 359                                     &num_clusters, &ext_flags);
 360         if (status) {
 361                 mlog_errno(status);
 362                 goto out;
 363         }
 364
 365         if (!(ext_flags & OCFS2_EXT_REFCOUNTED))
 366                 goto out;
 367
 368         return ocfs2_refcount_cow(inode, fe_bh, cpos, 1, cpos+1);
 369
 370 out:
 371         return status;
 372 }
 373
 374 static int ocfs2_orphan_for_truncate(struct ocfs2_super *osb,
 375                                      struct inode *inode,
 376                                      struct buffer_head *fe_bh,
 377                                      u64 new_i_size)
 378 {
 379         int status;
 380         handle_t *handle;
 381         struct ocfs2_dinode *di;
 382         u64 cluster_bytes;
 383
 384         mlog_entry_void();
 385
 386         /*
 387          * We need to CoW the cluster contains the offset if it is reflinked
 388          * since we will call ocfs2_zero_range_for_truncate later which will
 389          * write "0" from offset to the end of the cluster.
 390          */
 391         status = ocfs2_cow_file_pos(inode, fe_bh, new_i_size);
 392         if (status) {
 393                 mlog_errno(status);
 394                 return status;
 395         }
 396
 397         /* TODO: This needs to actually orphan the inode in this
 398          * transaction. */
 399
 400         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
 401         if (IS_ERR(handle)) {
 402                 status = PTR_ERR(handle);
 403                 mlog_errno(status);
 404                 goto out;
 405         }
 406
 407         status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), fe_bh,
 408                                          OCFS2_JOURNAL_ACCESS_WRITE);
 409         if (status < 0) {
 410                 mlog_errno(status);
 411                 goto out_commit;
 412         }
 413
 414         /*
 415          * Do this before setting i_size.
 416          */
 417         cluster_bytes = ocfs2_align_bytes_to_clusters(inode->i_sb, new_i_size);
 418         status = ocfs2_zero_range_for_truncate(inode, handle, new_i_size,
 419                                                cluster_bytes);
 420         if (status) {
 421                 mlog_errno(status);
 422                 goto out_commit;
 423         }
 424
 425         i_size_write(inode, new_i_size);
 426         inode->i_ctime = inode->i_mtime = CURRENT_TIME;
 427
 428         di = (struct ocfs2_dinode *) fe_bh->b_data;
 429         di->i_size = cpu_to_le64(new_i_size);
 430         di->i_ctime = di->i_mtime = cpu_to_le64(inode->i_ctime.tv_sec);
 431         di->i_ctime_nsec = di->i_mtime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
 432
 433         status = ocfs2_journal_dirty(handle, fe_bh);
 434         if (status < 0)
 435                 mlog_errno(status);
 436
 437 out_commit:
 438         ocfs2_commit_trans(osb, handle);
 439 out:
 440
 441         mlog_exit(status);
 442         return status;
 443 }
 444
 445 static int ocfs2_truncate_file(struct inode *inode,
 446                                struct buffer_head *di_bh,
 447                                u64 new_i_size)
 448 {
 449         int status = 0;
 450         struct ocfs2_dinode *fe = NULL;
 451         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 452         struct ocfs2_truncate_context *tc = NULL;
 453
 454         mlog_entry("(inode = %llu, new_i_size = %llu\n",
 455                    (unsigned long long)OCFS2_I(inode)->ip_blkno,
 456                    (unsigned long long)new_i_size);
 457
 458         /* We trust di_bh because it comes from ocfs2_inode_lock(), which
 459          * already validated it */
 460         fe = (struct ocfs2_dinode *) di_bh->b_data;
 461
 462         mlog_bug_on_msg(le64_to_cpu(fe->i_size) != i_size_read(inode),
 463                         "Inode %llu, inode i_size = %lld != di "
 464                         "i_size = %llu, i_flags = 0x%x\n",
 465                         (unsigned long long)OCFS2_I(inode)->ip_blkno,
 466                         i_size_read(inode),
 467                         (unsigned long long)le64_to_cpu(fe->i_size),
 468                         le32_to_cpu(fe->i_flags));
 469
 470         if (new_i_size > le64_to_cpu(fe->i_size)) {
 471                 mlog(0, "asked to truncate file with size (%llu) to size (%llu)!\n",
 472                      (unsigned long long)le64_to_cpu(fe->i_size),
 473                      (unsigned long long)new_i_size);
 474                 status = -EINVAL;
 475                 mlog_errno(status);
 476                 goto bail;
 477         }
 478
 479         mlog(0, "inode %llu, i_size = %llu, new_i_size = %llu\n",
 480              (unsigned long long)le64_to_cpu(fe->i_blkno),
 481              (unsigned long long)le64_to_cpu(fe->i_size),
 482              (unsigned long long)new_i_size);
 483
 484         /* lets handle the simple truncate cases before doing any more
 485          * cluster locking. */
 486         if (new_i_size == le64_to_cpu(fe->i_size))
 487                 goto bail;
 488
 489         down_write(&OCFS2_I(inode)->ip_alloc_sem);
 490
 491         /*
 492          * The inode lock forced other nodes to sync and drop their
 493          * pages, which (correctly) happens even if we have a truncate
 494          * without allocation change - ocfs2 cluster sizes can be much
 495          * greater than page size, so we have to truncate them
 496          * anyway.
 497          */
 498         unmap_mapping_range(inode->i_mapping, new_i_size + PAGE_SIZE - 1, 0, 1);
 499         truncate_inode_pages(inode->i_mapping, new_i_size);
 500
 501         if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
 502                 status = ocfs2_truncate_inline(inode, di_bh, new_i_size,
 503                                                i_size_read(inode), 1);
 504                 if (status)
 505                         mlog_errno(status);
 506
 507                 goto bail_unlock_sem;
 508         }
 509
 510         /* alright, we're going to need to do a full blown alloc size
 511          * change. Orphan the inode so that recovery can complete the
 512          * truncate if necessary. This does the task of marking
 513          * i_size. */
 514         status = ocfs2_orphan_for_truncate(osb, inode, di_bh, new_i_size);
 515         if (status < 0) {
 516                 mlog_errno(status);
 517                 goto bail_unlock_sem;
 518         }
 519
 520         status = ocfs2_prepare_truncate(osb, inode, di_bh, &tc);
 521         if (status < 0) {
 522                 mlog_errno(status);
 523                 goto bail_unlock_sem;
 524         }
 525
 526         status = ocfs2_commit_truncate(osb, inode, di_bh, tc);
 527         if (status < 0) {
 528                 mlog_errno(status);
 529                 goto bail_unlock_sem;
 530         }
 531
 532         /* TODO: orphan dir cleanup here. */
 533 bail_unlock_sem:
 534         up_write(&OCFS2_I(inode)->ip_alloc_sem);
 535
 536 bail:
 537         if (!status && OCFS2_I(inode)->ip_clusters == 0)
 538                 status = ocfs2_try_remove_refcount_tree(inode, di_bh);
 539
 540         mlog_exit(status);
 541         return status;
 542 }
 543
 544 /*
 545  * extend file allocation only here.
 546  * we'll update all the disk stuff, and oip->alloc_size
 547  *
 548  * expect stuff to be locked, a transaction started and enough data /
 549  * metadata reservations in the contexts.
 550  *
 551  * Will return -EAGAIN, and a reason if a restart is needed.
 552  * If passed in, *reason will always be set, even in error.
 553  */
 554 int ocfs2_add_inode_data(struct ocfs2_super *osb,
 555                          struct inode *inode,
 556                          u32 *logical_offset,
 557                          u32 clusters_to_add,
 558                          int mark_unwritten,
 559                          struct buffer_head *fe_bh,
 560                          handle_t *handle,
 561                          struct ocfs2_alloc_context *data_ac,
 562                          struct ocfs2_alloc_context *meta_ac,
 563                          enum ocfs2_alloc_restarted *reason_ret)
 564 {
 565         int ret;
 566         struct ocfs2_extent_tree et;
 567
 568         ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), fe_bh);
 569         ret = ocfs2_add_clusters_in_btree(handle, &et, logical_offset,
 570                                           clusters_to_add, mark_unwritten,
 571                                           data_ac, meta_ac, reason_ret);
 572
 573         return ret;
 574 }
 575
 576 static int __ocfs2_extend_allocation(struct inode *inode, u32 logical_start,
 577                                      u32 clusters_to_add, int mark_unwritten)
 578 {
 579         int status = 0;
 580         int restart_func = 0;
 581         int credits;
 582         u32 prev_clusters;
 583         struct buffer_head *bh = NULL;
 584         struct ocfs2_dinode *fe = NULL;
 585         handle_t *handle = NULL;
 586         struct ocfs2_alloc_context *data_ac = NULL;
 587         struct ocfs2_alloc_context *meta_ac = NULL;
 588         enum ocfs2_alloc_restarted why;
 589         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 590         struct ocfs2_extent_tree et;
 591         int did_quota = 0;
 592
 593         mlog_entry("(clusters_to_add = %u)\n", clusters_to_add);
 594
 595         /*
 596          * This function only exists for file systems which don't
 597          * support holes.
 598          */
 599         BUG_ON(mark_unwritten && !ocfs2_sparse_alloc(osb));
 600
 601         status = ocfs2_read_inode_block(inode, &bh);
 602         if (status < 0) {
 603                 mlog_errno(status);
 604                 goto leave;
 605         }
 606         fe = (struct ocfs2_dinode *) bh->b_data;
 607
 608 restart_all:
 609         BUG_ON(le32_to_cpu(fe->i_clusters) != OCFS2_I(inode)->ip_clusters);
 610
 611         mlog(0, "extend inode %llu, i_size = %lld, di->i_clusters = %u, "
 612              "clusters_to_add = %u\n",
 613              (unsigned long long)OCFS2_I(inode)->ip_blkno,
 614              (long long)i_size_read(inode), le32_to_cpu(fe->i_clusters),
 615              clusters_to_add);
 616         ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), bh);
 617         status = ocfs2_lock_allocators(inode, &et, clusters_to_add, 0,
 618                                        &data_ac, &meta_ac);
 619         if (status) {
 620                 mlog_errno(status);
 621                 goto leave;
 622         }
 623
 624         credits = ocfs2_calc_extend_credits(osb->sb, &fe->id2.i_list,
 625                                             clusters_to_add);
 626         handle = ocfs2_start_trans(osb, credits);
 627         if (IS_ERR(handle)) {
 628                 status = PTR_ERR(handle);
 629                 handle = NULL;
 630                 mlog_errno(status);
 631                 goto leave;
 632         }
 633
 634 restarted_transaction:
 635         status = dquot_alloc_space_nodirty(inode,
 636                         ocfs2_clusters_to_bytes(osb->sb, clusters_to_add));
 637         if (status)
 638                 goto leave;
 639         did_quota = 1;
 640
 641         /* reserve a write to the file entry early on - that we if we
 642          * run out of credits in the allocation path, we can still
 643          * update i_size. */
 644         status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), bh,
 645                                          OCFS2_JOURNAL_ACCESS_WRITE);
 646         if (status < 0) {
 647                 mlog_errno(status);
 648                 goto leave;
 649         }
 650
 651         prev_clusters = OCFS2_I(inode)->ip_clusters;
 652
 653         status = ocfs2_add_inode_data(osb,
 654                                       inode,
 655                                       &logical_start,
 656                                       clusters_to_add,
 657                                       mark_unwritten,
 658                                       bh,
 659                                       handle,
 660                                       data_ac,
 661                                       meta_ac,
 662                                       &why);
 663         if ((status < 0) && (status != -EAGAIN)) {
 664                 if (status != -ENOSPC)
 665                         mlog_errno(status);
 666                 goto leave;
 667         }
 668
 669         status = ocfs2_journal_dirty(handle, bh);
 670         if (status < 0) {
 671                 mlog_errno(status);
 672                 goto leave;
 673         }
 674
 675         spin_lock(&OCFS2_I(inode)->ip_lock);
 676         clusters_to_add -= (OCFS2_I(inode)->ip_clusters - prev_clusters);
 677         spin_unlock(&OCFS2_I(inode)->ip_lock);
 678         /* Release unused quota reservation */
 679         dquot_free_space(inode,
 680                         ocfs2_clusters_to_bytes(osb->sb, clusters_to_add));
 681         did_quota = 0;
 682
 683         if (why != RESTART_NONE && clusters_to_add) {
 684                 if (why == RESTART_META) {
 685                         mlog(0, "restarting function.\n");
 686                         restart_func = 1;
 687                 } else {
 688                         BUG_ON(why != RESTART_TRANS);
 689
 690                         mlog(0, "restarting transaction.\n");
 691                         /* TODO: This can be more intelligent. */
 692                         credits = ocfs2_calc_extend_credits(osb->sb,
 693                                                             &fe->id2.i_list,
 694                                                             clusters_to_add);
 695                         status = ocfs2_extend_trans(handle, credits);
 696                         if (status < 0) {
 697                                 /* handle still has to be committed at
 698                                  * this point. */
 699                                 status = -ENOMEM;
 700                                 mlog_errno(status);
 701                                 goto leave;
 702                         }
 703                         goto restarted_transaction;
 704                 }
 705         }
 706
 707         mlog(0, "fe: i_clusters = %u, i_size=%llu\n",
 708              le32_to_cpu(fe->i_clusters),
 709              (unsigned long long)le64_to_cpu(fe->i_size));
 710         mlog(0, "inode: ip_clusters=%u, i_size=%lld\n",
 711              OCFS2_I(inode)->ip_clusters, (long long)i_size_read(inode));
 712
 713 leave:
 714         if (status < 0 && did_quota)
 715                 dquot_free_space(inode,
 716                         ocfs2_clusters_to_bytes(osb->sb, clusters_to_add));
 717         if (handle) {
 718                 ocfs2_commit_trans(osb, handle);
 719                 handle = NULL;
 720         }
 721         if (data_ac) {
 722                 ocfs2_free_alloc_context(data_ac);
 723                 data_ac = NULL;
 724         }
 725         if (meta_ac) {
 726                 ocfs2_free_alloc_context(meta_ac);
 727                 meta_ac = NULL;
 728         }
 729         if ((!status) && restart_func) {
 730                 restart_func = 0;
 731                 goto restart_all;
 732         }
 733         brelse(bh);
 734         bh = NULL;
 735
 736         mlog_exit(status);
 737         return status;
 738 }
 739
 740 /* Some parts of this taken from generic_cont_expand, which turned out
 741  * to be too fragile to do exactly what we need without us having to
 742  * worry about recursive locking in ->write_begin() and ->write_end(). */
 743 static int ocfs2_write_zero_page(struct inode *inode,
 744                                  u64 size)
 745 {
 746         struct address_space *mapping = inode->i_mapping;
 747         struct page *page;
 748         unsigned long index;
 749         unsigned int offset;
 750         handle_t *handle = NULL;
 751         int ret;
 752
 753         offset = (size & (PAGE_CACHE_SIZE-1)); /* Within page */
 754         /* ugh.  in prepare/commit_write, if from==to==start of block, we
 755         ** skip the prepare.  make sure we never send an offset for the start
 756         ** of a block
 757         */
 758         if ((offset & (inode->i_sb->s_blocksize - 1)) == 0) {
 759                 offset++;
 760         }
 761         index = size >> PAGE_CACHE_SHIFT;
 762
 763         page = grab_cache_page(mapping, index);
 764         if (!page) {
 765                 ret = -ENOMEM;
 766                 mlog_errno(ret);
 767                 goto out;
 768         }
 769
 770         ret = ocfs2_prepare_write_nolock(inode, page, offset, offset);
 771         if (ret < 0) {
 772                 mlog_errno(ret);
 773                 goto out_unlock;
 774         }
 775
 776         if (ocfs2_should_order_data(inode)) {
 777                 handle = ocfs2_start_walk_page_trans(inode, page, offset,
 778                                                      offset);
 779                 if (IS_ERR(handle)) {
 780                         ret = PTR_ERR(handle);
 781                         handle = NULL;
 782                         goto out_unlock;
 783                 }
 784         }
 785
 786         /* must not update i_size! */
 787         ret = block_commit_write(page, offset, offset);
 788         if (ret < 0)
 789                 mlog_errno(ret);
 790         else
 791                 ret = 0;
 792
 793         if (handle)
 794                 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
 795 out_unlock:
 796         unlock_page(page);
 797         page_cache_release(page);
 798 out:
 799         return ret;
 800 }
 801
 802 static int ocfs2_zero_extend(struct inode *inode,
 803                              u64 zero_to_size)
 804 {
 805         int ret = 0;
 806         u64 start_off;
 807         struct super_block *sb = inode->i_sb;
 808
 809         start_off = ocfs2_align_bytes_to_blocks(sb, i_size_read(inode));
 810         while (start_off < zero_to_size) {
 811                 ret = ocfs2_write_zero_page(inode, start_off);
 812                 if (ret < 0) {
 813                         mlog_errno(ret);
 814                         goto out;
 815                 }
 816
 817                 start_off += sb->s_blocksize;
 818
 819                 /*
 820                  * Very large extends have the potential to lock up
 821                  * the cpu for extended periods of time.
 822                  */
 823                 cond_resched();
 824         }
 825
 826 out:
 827         return ret;
 828 }
 829
 830 int ocfs2_extend_no_holes(struct inode *inode, u64 new_i_size, u64 zero_to)
 831 {
 832         int ret;
 833         u32 clusters_to_add;
 834         struct ocfs2_inode_info *oi = OCFS2_I(inode);
 835
 836         clusters_to_add = ocfs2_clusters_for_bytes(inode->i_sb, new_i_size);
 837         if (clusters_to_add < oi->ip_clusters)
 838                 clusters_to_add = 0;
 839         else
 840                 clusters_to_add -= oi->ip_clusters;
 841
 842         if (clusters_to_add) {
 843                 ret = __ocfs2_extend_allocation(inode, oi->ip_clusters,
 844                                                 clusters_to_add, 0);
 845                 if (ret) {
 846                         mlog_errno(ret);
 847                         goto out;
 848                 }
 849         }
 850
 851         /*
 852          * Call this even if we don't add any clusters to the tree. We
 853          * still need to zero the area between the old i_size and the
 854          * new i_size.
 855          */
 856         ret = ocfs2_zero_extend(inode, zero_to);
 857         if (ret < 0)
 858                 mlog_errno(ret);
 859
 860 out:
 861         return ret;
 862 }
 863
 864 static int ocfs2_extend_file(struct inode *inode,
 865                              struct buffer_head *di_bh,
 866                              u64 new_i_size)
 867 {
 868         int ret = 0;
 869         struct ocfs2_inode_info *oi = OCFS2_I(inode);
 870
 871         BUG_ON(!di_bh);
 872
 873         /* setattr sometimes calls us like this. */
 874         if (new_i_size == 0)
 875                 goto out;
 876
 877         if (i_size_read(inode) == new_i_size)
 878                 goto out;
 879         BUG_ON(new_i_size < i_size_read(inode));
 880
 881         /*
 882          * Fall through for converting inline data, even if the fs
 883          * supports sparse files.
 884          *
 885          * The check for inline data here is legal - nobody can add
 886          * the feature since we have i_mutex. We must check it again
 887          * after acquiring ip_alloc_sem though, as paths like mmap
 888          * might have raced us to converting the inode to extents.
 889          */
 890         if (!(oi->ip_dyn_features & OCFS2_INLINE_DATA_FL)
 891             && ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)))
 892                 goto out_update_size;
 893
 894         /*
 895          * The alloc sem blocks people in read/write from reading our
 896          * allocation until we're done changing it. We depend on
 897          * i_mutex to block other extend/truncate calls while we're
 898          * here.
 899          */
 900         down_write(&oi->ip_alloc_sem);
 901
 902         if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
 903                 /*
 904                  * We can optimize small extends by keeping the inodes
 905                  * inline data.
 906                  */
 907                 if (ocfs2_size_fits_inline_data(di_bh, new_i_size)) {
 908                         up_write(&oi->ip_alloc_sem);
 909                         goto out_update_size;
 910                 }
 911
 912                 ret = ocfs2_convert_inline_data_to_extents(inode, di_bh);
 913                 if (ret) {
 914                         up_write(&oi->ip_alloc_sem);
 915
 916                         mlog_errno(ret);
 917                         goto out;
 918                 }
 919         }
 920
 921         if (!ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)))
 922                 ret = ocfs2_extend_no_holes(inode, new_i_size, new_i_size);
 923
 924         up_write(&oi->ip_alloc_sem);
 925
 926         if (ret < 0) {
 927                 mlog_errno(ret);
 928                 goto out;
 929         }
 930
 931 out_update_size:
 932         ret = ocfs2_simple_size_update(inode, di_bh, new_i_size);
 933         if (ret < 0)
 934                 mlog_errno(ret);
 935
 936 out:
 937         return ret;
 938 }
 939
 940 int ocfs2_setattr(struct dentry *dentry, struct iattr *attr)
 941 {
 942         int status = 0, size_change;
 943         struct inode *inode = dentry->d_inode;
 944         struct super_block *sb = inode->i_sb;
 945         struct ocfs2_super *osb = OCFS2_SB(sb);
 946         struct buffer_head *bh = NULL;
 947         handle_t *handle = NULL;
 948         int qtype;
 949         struct dquot *transfer_from[MAXQUOTAS] = { };
 950         struct dquot *transfer_to[MAXQUOTAS] = { };
 951
 952         mlog_entry("(0x%p, '%.*s')\n", dentry,
 953                    dentry->d_name.len, dentry->d_name.name);
 954
 955         /* ensuring we don't even attempt to truncate a symlink */
 956         if (S_ISLNK(inode->i_mode))
 957                 attr->ia_valid &= ~ATTR_SIZE;
 958
 959         if (attr->ia_valid & ATTR_MODE)
 960                 mlog(0, "mode change: %d\n", attr->ia_mode);
 961         if (attr->ia_valid & ATTR_UID)
 962                 mlog(0, "uid change: %d\n", attr->ia_uid);
 963         if (attr->ia_valid & ATTR_GID)
 964                 mlog(0, "gid change: %d\n", attr->ia_gid);
 965         if (attr->ia_valid & ATTR_SIZE)
 966                 mlog(0, "size change...\n");
 967         if (attr->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_CTIME))
 968                 mlog(0, "time change...\n");
 969
 970 #define OCFS2_VALID_ATTRS (ATTR_ATIME | ATTR_MTIME | ATTR_CTIME | ATTR_SIZE \
 971                            | ATTR_GID | ATTR_UID | ATTR_MODE)
 972         if (!(attr->ia_valid & OCFS2_VALID_ATTRS)) {
 973                 mlog(0, "can't handle attrs: 0x%x\n", attr->ia_valid);
 974                 return 0;
 975         }
 976
 977         status = inode_change_ok(inode, attr);
 978         if (status)
 979                 return status;
 980
 981         size_change = S_ISREG(inode->i_mode) && attr->ia_valid & ATTR_SIZE;
 982         if (size_change) {
 983                 dquot_initialize(inode);
 984
 985                 status = ocfs2_rw_lock(inode, 1);
 986                 if (status < 0) {
 987                         mlog_errno(status);
 988                         goto bail;
 989                 }
 990         }
 991
 992         status = ocfs2_inode_lock(inode, &bh, 1);
 993         if (status < 0) {
 994                 if (status != -ENOENT)
 995                         mlog_errno(status);
 996                 goto bail_unlock_rw;
 997         }
 998
 999         if (size_change && attr->ia_size != i_size_read(inode)) {
1000                 status = inode_newsize_ok(inode, attr->ia_size);
1001                 if (status)
1002                         goto bail_unlock;
1003
1004                 if (i_size_read(inode) > attr->ia_size) {
1005                         if (ocfs2_should_order_data(inode)) {
1006                                 status = ocfs2_begin_ordered_truncate(inode,
1007                                                                       attr->ia_size);
1008                                 if (status)
1009                                         goto bail_unlock;
1010                         }
1011                         status = ocfs2_truncate_file(inode, bh, attr->ia_size);
1012                 } else
1013                         status = ocfs2_extend_file(inode, bh, attr->ia_size);
1014                 if (status < 0) {
1015                         if (status != -ENOSPC)
1016                                 mlog_errno(status);
1017                         status = -ENOSPC;
1018                         goto bail_unlock;
1019                 }
1020         }
1021
1022         if ((attr->ia_valid & ATTR_UID && attr->ia_uid != inode->i_uid) ||
1023             (attr->ia_valid & ATTR_GID && attr->ia_gid != inode->i_gid)) {
1024                 /*
1025                  * Gather pointers to quota structures so that allocation /
1026                  * freeing of quota structures happens here and not inside
1027                  * dquot_transfer() where we have problems with lock ordering
1028                  */
1029                 if (attr->ia_valid & ATTR_UID && attr->ia_uid != inode->i_uid
1030                     && OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1031                     OCFS2_FEATURE_RO_COMPAT_USRQUOTA)) {
1032                         transfer_to[USRQUOTA] = dqget(sb, attr->ia_uid,
1033                                                       USRQUOTA);
1034                         transfer_from[USRQUOTA] = dqget(sb, inode->i_uid,
1035                                                         USRQUOTA);
1036                         if (!transfer_to[USRQUOTA] || !transfer_from[USRQUOTA]) {
1037                                 status = -ESRCH;
1038                                 goto bail_unlock;
1039                         }
1040                 }
1041                 if (attr->ia_valid & ATTR_GID && attr->ia_gid != inode->i_gid
1042                     && OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1043                     OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)) {
1044                         transfer_to[GRPQUOTA] = dqget(sb, attr->ia_gid,
1045                                                       GRPQUOTA);
1046                         transfer_from[GRPQUOTA] = dqget(sb, inode->i_gid,
1047                                                         GRPQUOTA);
1048                         if (!transfer_to[GRPQUOTA] || !transfer_from[GRPQUOTA]) {
1049                                 status = -ESRCH;
1050                                 goto bail_unlock;
1051                         }
1052                 }
1053                 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS +
1054                                            2 * ocfs2_quota_trans_credits(sb));
1055                 if (IS_ERR(handle)) {
1056                         status = PTR_ERR(handle);
1057                         mlog_errno(status);
1058                         goto bail_unlock;
1059                 }
1060                 status = dquot_transfer(inode, attr);
1061                 if (status < 0)
1062                         goto bail_commit;
1063         } else {
1064                 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1065                 if (IS_ERR(handle)) {
1066                         status = PTR_ERR(handle);
1067                         mlog_errno(status);
1068                         goto bail_unlock;
1069                 }
1070         }
1071
1072         /*
1073          * This will intentionally not wind up calling vmtruncate(),
1074          * since all the work for a size change has been done above.
1075          * Otherwise, we could get into problems with truncate as
1076          * ip_alloc_sem is used there to protect against i_size
1077          * changes.
1078          */
1079         status = inode_setattr(inode, attr);
1080         if (status < 0) {
1081                 mlog_errno(status);
1082                 goto bail_commit;
1083         }
1084
1085         status = ocfs2_mark_inode_dirty(handle, inode, bh);
1086         if (status < 0)
1087                 mlog_errno(status);
1088
1089 bail_commit:
1090         ocfs2_commit_trans(osb, handle);
1091 bail_unlock:
1092         ocfs2_inode_unlock(inode, 1);
1093 bail_unlock_rw:
1094         if (size_change)
1095                 ocfs2_rw_unlock(inode, 1);
1096 bail:
1097         brelse(bh);
1098
1099         /* Release quota pointers in case we acquired them */
1100         for (qtype = 0; qtype < MAXQUOTAS; qtype++) {
1101                 dqput(transfer_to[qtype]);
1102                 dqput(transfer_from[qtype]);
1103         }
1104
1105         if (!status && attr->ia_valid & ATTR_MODE) {
1106                 status = ocfs2_acl_chmod(inode);
1107                 if (status < 0)
1108                         mlog_errno(status);
1109         }
1110
1111         mlog_exit(status);
1112         return status;
1113 }
1114
1115 int ocfs2_getattr(struct vfsmount *mnt,
1116                   struct dentry *dentry,
1117                   struct kstat *stat)
1118 {
1119         struct inode *inode = dentry->d_inode;
1120         struct super_block *sb = dentry->d_inode->i_sb;
1121         struct ocfs2_super *osb = sb->s_fs_info;
1122         int err;
1123
1124         mlog_entry_void();
1125
1126         err = ocfs2_inode_revalidate(dentry);
1127         if (err) {
1128                 if (err != -ENOENT)
1129                         mlog_errno(err);
1130                 goto bail;
1131         }
1132
1133         generic_fillattr(inode, stat);
1134
1135         /* We set the blksize from the cluster size for performance */
1136         stat->blksize = osb->s_clustersize;
1137
1138 bail:
1139         mlog_exit(err);
1140
1141         return err;
1142 }
1143
1144 int ocfs2_permission(struct inode *inode, int mask)
1145 {
1146         int ret;
1147
1148         mlog_entry_void();
1149
1150         ret = ocfs2_inode_lock(inode, NULL, 0);
1151         if (ret) {
1152                 if (ret != -ENOENT)
1153                         mlog_errno(ret);
1154                 goto out;
1155         }
1156
1157         ret = generic_permission(inode, mask, ocfs2_check_acl);
1158
1159         ocfs2_inode_unlock(inode, 0);
1160 out:
1161         mlog_exit(ret);
1162         return ret;
1163 }
1164
1165 static int __ocfs2_write_remove_suid(struct inode *inode,
1166                                      struct buffer_head *bh)
1167 {
1168         int ret;
1169         handle_t *handle;
1170         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1171         struct ocfs2_dinode *di;
1172
1173         mlog_entry("(Inode %llu, mode 0%o)\n",
1174                    (unsigned long long)OCFS2_I(inode)->ip_blkno, inode->i_mode);
1175
1176         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1177         if (IS_ERR(handle)) {
1178                 ret = PTR_ERR(handle);
1179                 mlog_errno(ret);
1180                 goto out;
1181         }
1182
1183         ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), bh,
1184                                       OCFS2_JOURNAL_ACCESS_WRITE);
1185         if (ret < 0) {
1186                 mlog_errno(ret);
1187                 goto out_trans;
1188         }
1189
1190         inode->i_mode &= ~S_ISUID;
1191         if ((inode->i_mode & S_ISGID) && (inode->i_mode & S_IXGRP))
1192                 inode->i_mode &= ~S_ISGID;
1193
1194         di = (struct ocfs2_dinode *) bh->b_data;
1195         di->i_mode = cpu_to_le16(inode->i_mode);
1196
1197         ret = ocfs2_journal_dirty(handle, bh);
1198         if (ret < 0)
1199                 mlog_errno(ret);
1200
1201 out_trans:
1202         ocfs2_commit_trans(osb, handle);
1203 out:
1204         mlog_exit(ret);
1205         return ret;
1206 }
1207
1208 /*
1209  * Will look for holes and unwritten extents in the range starting at
1210  * pos for count bytes (inclusive).
1211  */
1212 static int ocfs2_check_range_for_holes(struct inode *inode, loff_t pos,
1213                                        size_t count)
1214 {
1215         int ret = 0;
1216         unsigned int extent_flags;
1217         u32 cpos, clusters, extent_len, phys_cpos;
1218         struct super_block *sb = inode->i_sb;
1219
1220         cpos = pos >> OCFS2_SB(sb)->s_clustersize_bits;
1221         clusters = ocfs2_clusters_for_bytes(sb, pos + count) - cpos;
1222
1223         while (clusters) {
1224                 ret = ocfs2_get_clusters(inode, cpos, &phys_cpos, &extent_len,
1225                                          &extent_flags);
1226                 if (ret < 0) {
1227                         mlog_errno(ret);
1228                         goto out;
1229                 }
1230
1231                 if (phys_cpos == 0 || (extent_flags & OCFS2_EXT_UNWRITTEN)) {
1232                         ret = 1;
1233                         break;
1234                 }
1235
1236                 if (extent_len > clusters)
1237                         extent_len = clusters;
1238
1239                 clusters -= extent_len;
1240                 cpos += extent_len;
1241         }
1242 out:
1243         return ret;
1244 }
1245
1246 static int ocfs2_write_remove_suid(struct inode *inode)
1247 {
1248         int ret;
1249         struct buffer_head *bh = NULL;
1250
1251         ret = ocfs2_read_inode_block(inode, &bh);
1252         if (ret < 0) {
1253                 mlog_errno(ret);
1254                 goto out;
1255         }
1256
1257         ret =  __ocfs2_write_remove_suid(inode, bh);
1258 out:
1259         brelse(bh);
1260         return ret;
1261 }
1262
1263 /*
1264  * Allocate enough extents to cover the region starting at byte offset
1265  * start for len bytes. Existing extents are skipped, any extents
1266  * added are marked as "unwritten".
1267  */
1268 static int ocfs2_allocate_unwritten_extents(struct inode *inode,
1269                                             u64 start, u64 len)
1270 {
1271         int ret;
1272         u32 cpos, phys_cpos, clusters, alloc_size;
1273         u64 end = start + len;
1274         struct buffer_head *di_bh = NULL;
1275
1276         if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1277                 ret = ocfs2_read_inode_block(inode, &di_bh);
1278                 if (ret) {
1279                         mlog_errno(ret);
1280                         goto out;
1281                 }
1282
1283                 /*
1284                  * Nothing to do if the requested reservation range
1285                  * fits within the inode.
1286                  */
1287                 if (ocfs2_size_fits_inline_data(di_bh, end))
1288                         goto out;
1289
1290                 ret = ocfs2_convert_inline_data_to_extents(inode, di_bh);
1291                 if (ret) {
1292                         mlog_errno(ret);
1293                         goto out;
1294                 }
1295         }
1296
1297         /*
1298          * We consider both start and len to be inclusive.
1299          */
1300         cpos = start >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
1301         clusters = ocfs2_clusters_for_bytes(inode->i_sb, start + len);
1302         clusters -= cpos;
1303
1304         while (clusters) {
1305                 ret = ocfs2_get_clusters(inode, cpos, &phys_cpos,
1306                                          &alloc_size, NULL);
1307                 if (ret) {
1308                         mlog_errno(ret);
1309                         goto out;
1310                 }
1311
1312                 /*
1313                  * Hole or existing extent len can be arbitrary, so
1314                  * cap it to our own allocation request.
1315                  */
1316                 if (alloc_size > clusters)
1317                         alloc_size = clusters;
1318
1319                 if (phys_cpos) {
1320                         /*
1321                          * We already have an allocation at this
1322                          * region so we can safely skip it.
1323                          */
1324                         goto next;
1325                 }
1326
1327                 ret = __ocfs2_extend_allocation(inode, cpos, alloc_size, 1);
1328                 if (ret) {
1329                         if (ret != -ENOSPC)
1330                                 mlog_errno(ret);
1331                         goto out;
1332                 }
1333
1334 next:
1335                 cpos += alloc_size;
1336                 clusters -= alloc_size;
1337         }
1338
1339         ret = 0;
1340 out:
1341
1342         brelse(di_bh);
1343         return ret;
1344 }
1345
1346 /*
1347  * Truncate a byte range, avoiding pages within partial clusters. This
1348  * preserves those pages for the zeroing code to write to.
1349  */
1350 static void ocfs2_truncate_cluster_pages(struct inode *inode, u64 byte_start,
1351                                          u64 byte_len)
1352 {
1353         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1354         loff_t start, end;
1355         struct address_space *mapping = inode->i_mapping;
1356
1357         start = (loff_t)ocfs2_align_bytes_to_clusters(inode->i_sb, byte_start);
1358         end = byte_start + byte_len;
1359         end = end & ~(osb->s_clustersize - 1);
1360
1361         if (start < end) {
1362                 unmap_mapping_range(mapping, start, end - start, 0);
1363                 truncate_inode_pages_range(mapping, start, end - 1);
1364         }
1365 }
1366
1367 static int ocfs2_zero_partial_clusters(struct inode *inode,
1368                                        u64 start, u64 len)
1369 {
1370         int ret = 0;
1371         u64 tmpend, end = start + len;
1372         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1373         unsigned int csize = osb->s_clustersize;
1374         handle_t *handle;
1375
1376         /*
1377          * The "start" and "end" values are NOT necessarily part of
1378          * the range whose allocation is being deleted. Rather, this
1379          * is what the user passed in with the request. We must zero
1380          * partial clusters here. There's no need to worry about
1381          * physical allocation - the zeroing code knows to skip holes.
1382          */
1383         mlog(0, "byte start: %llu, end: %llu\n",
1384              (unsigned long long)start, (unsigned long long)end);
1385
1386         /*
1387          * If both edges are on a cluster boundary then there's no
1388          * zeroing required as the region is part of the allocation to
1389          * be truncated.
1390          */
1391         if ((start & (csize - 1)) == 0 && (end & (csize - 1)) == 0)
1392                 goto out;
1393
1394         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1395         if (IS_ERR(handle)) {
1396                 ret = PTR_ERR(handle);
1397                 mlog_errno(ret);
1398                 goto out;
1399         }
1400
1401         /*
1402          * We want to get the byte offset of the end of the 1st cluster.
1403          */
1404         tmpend = (u64)osb->s_clustersize + (start & ~(osb->s_clustersize - 1));
1405         if (tmpend > end)
1406                 tmpend = end;
1407
1408         mlog(0, "1st range: start: %llu, tmpend: %llu\n",
1409              (unsigned long long)start, (unsigned long long)tmpend);
1410
1411         ret = ocfs2_zero_range_for_truncate(inode, handle, start, tmpend);
1412         if (ret)
1413                 mlog_errno(ret);
1414
1415         if (tmpend < end) {
1416                 /*
1417                  * This may make start and end equal, but the zeroing
1418                  * code will skip any work in that case so there's no
1419                  * need to catch it up here.
1420                  */
1421                 start = end & ~(osb->s_clustersize - 1);
1422
1423                 mlog(0, "2nd range: start: %llu, end: %llu\n",
1424                      (unsigned long long)start, (unsigned long long)end);
1425
1426                 ret = ocfs2_zero_range_for_truncate(inode, handle, start, end);
1427                 if (ret)
1428                         mlog_errno(ret);
1429         }
1430
1431         ocfs2_commit_trans(osb, handle);
1432 out:
1433         return ret;
1434 }
1435
1436 static int ocfs2_remove_inode_range(struct inode *inode,
1437                                     struct buffer_head *di_bh, u64 byte_start,
1438                                     u64 byte_len)
1439 {
1440         int ret = 0;
1441         u32 trunc_start, trunc_len, cpos, phys_cpos, alloc_size;
1442         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1443         struct ocfs2_cached_dealloc_ctxt dealloc;
1444         struct address_space *mapping = inode->i_mapping;
1445         struct ocfs2_extent_tree et;
1446
1447         ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), di_bh);
1448         ocfs2_init_dealloc_ctxt(&dealloc);
1449
1450         if (byte_len == 0)
1451                 return 0;
1452
1453         if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1454                 ret = ocfs2_truncate_inline(inode, di_bh, byte_start,
1455                                             byte_start + byte_len, 0);
1456                 if (ret) {
1457                         mlog_errno(ret);
1458                         goto out;
1459                 }
1460                 /*
1461                  * There's no need to get fancy with the page cache
1462                  * truncate of an inline-data inode. We're talking
1463                  * about less than a page here, which will be cached
1464                  * in the dinode buffer anyway.
1465                  */
1466                 unmap_mapping_range(mapping, 0, 0, 0);
1467                 truncate_inode_pages(mapping, 0);
1468                 goto out;
1469         }
1470
1471         trunc_start = ocfs2_clusters_for_bytes(osb->sb, byte_start);
1472         trunc_len = (byte_start + byte_len) >> osb->s_clustersize_bits;
1473         if (trunc_len >= trunc_start)
1474                 trunc_len -= trunc_start;
1475         else
1476                 trunc_len = 0;
1477
1478         mlog(0, "Inode: %llu, start: %llu, len: %llu, cstart: %u, clen: %u\n",
1479              (unsigned long long)OCFS2_I(inode)->ip_blkno,
1480              (unsigned long long)byte_start,
1481              (unsigned long long)byte_len, trunc_start, trunc_len);
1482
1483         ret = ocfs2_zero_partial_clusters(inode, byte_start, byte_len);
1484         if (ret) {
1485                 mlog_errno(ret);
1486                 goto out;
1487         }
1488
1489         cpos = trunc_start;
1490         while (trunc_len) {
1491                 ret = ocfs2_get_clusters(inode, cpos, &phys_cpos,
1492                                          &alloc_size, NULL);
1493                 if (ret) {
1494                         mlog_errno(ret);
1495                         goto out;
1496                 }
1497
1498                 if (alloc_size > trunc_len)
1499                         alloc_size = trunc_len;
1500
1501                 /* Only do work for non-holes */
1502                 if (phys_cpos != 0) {
1503                         ret = ocfs2_remove_btree_range(inode, &et, cpos,
1504                                                        phys_cpos, alloc_size,
1505                                                        &dealloc);
1506                         if (ret) {
1507                                 mlog_errno(ret);
1508                                 goto out;
1509                         }
1510                 }
1511
1512                 cpos += alloc_size;
1513                 trunc_len -= alloc_size;
1514         }
1515
1516         ocfs2_truncate_cluster_pages(inode, byte_start, byte_len);
1517
1518 out:
1519         ocfs2_schedule_truncate_log_flush(osb, 1);
1520         ocfs2_run_deallocs(osb, &dealloc);
1521
1522         return ret;
1523 }
1524
1525 /*
1526  * Parts of this function taken from xfs_change_file_space()
1527  */
1528 static int __ocfs2_change_file_space(struct file *file, struct inode *inode,
1529                                      loff_t f_pos, unsigned int cmd,
1530                                      struct ocfs2_space_resv *sr,
1531                                      int change_size)
1532 {
1533         int ret;
1534         s64 llen;
1535         loff_t size;
1536         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1537         struct buffer_head *di_bh = NULL;
1538         handle_t *handle;
1539         unsigned long long max_off = inode->i_sb->s_maxbytes;
1540
1541         if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
1542                 return -EROFS;
1543
1544         mutex_lock(&inode->i_mutex);
1545
1546         /*
1547          * This prevents concurrent writes on other nodes
1548          */
1549         ret = ocfs2_rw_lock(inode, 1);
1550         if (ret) {
1551                 mlog_errno(ret);
1552                 goto out;
1553         }
1554
1555         ret = ocfs2_inode_lock(inode, &di_bh, 1);
1556         if (ret) {
1557                 mlog_errno(ret);
1558                 goto out_rw_unlock;
1559         }
1560
1561         if (inode->i_flags & (S_IMMUTABLE|S_APPEND)) {
1562                 ret = -EPERM;
1563                 goto out_inode_unlock;
1564         }
1565
1566         switch (sr->l_whence) {
1567         case 0: /*SEEK_SET*/
1568                 break;
1569         case 1: /*SEEK_CUR*/
1570                 sr->l_start += f_pos;
1571                 break;
1572         case 2: /*SEEK_END*/
1573                 sr->l_start += i_size_read(inode);
1574                 break;
1575         default:
1576                 ret = -EINVAL;
1577                 goto out_inode_unlock;
1578         }
1579         sr->l_whence = 0;
1580
1581         llen = sr->l_len > 0 ? sr->l_len - 1 : sr->l_len;
1582
1583         if (sr->l_start < 0
1584             || sr->l_start > max_off
1585             || (sr->l_start + llen) < 0
1586             || (sr->l_start + llen) > max_off) {
1587                 ret = -EINVAL;
1588                 goto out_inode_unlock;
1589         }
1590         size = sr->l_start + sr->l_len;
1591
1592         if (cmd == OCFS2_IOC_RESVSP || cmd == OCFS2_IOC_RESVSP64) {
1593                 if (sr->l_len <= 0) {
1594                         ret = -EINVAL;
1595                         goto out_inode_unlock;
1596                 }
1597         }
1598
1599         if (file && should_remove_suid(file->f_path.dentry)) {
1600                 ret = __ocfs2_write_remove_suid(inode, di_bh);
1601                 if (ret) {
1602                         mlog_errno(ret);
1603                         goto out_inode_unlock;
1604                 }
1605         }
1606
1607         down_write(&OCFS2_I(inode)->ip_alloc_sem);
1608         switch (cmd) {
1609         case OCFS2_IOC_RESVSP:
1610         case OCFS2_IOC_RESVSP64:
1611                 /*
1612                  * This takes unsigned offsets, but the signed ones we
1613                  * pass have been checked against overflow above.
1614                  */
1615                 ret = ocfs2_allocate_unwritten_extents(inode, sr->l_start,
1616                                                        sr->l_len);
1617                 break;
1618         case OCFS2_IOC_UNRESVSP:
1619         case OCFS2_IOC_UNRESVSP64:
1620                 ret = ocfs2_remove_inode_range(inode, di_bh, sr->l_start,
1621                                                sr->l_len);
1622                 break;
1623         default:
1624                 ret = -EINVAL;
1625         }
1626         up_write(&OCFS2_I(inode)->ip_alloc_sem);
1627         if (ret) {
1628                 mlog_errno(ret);
1629                 goto out_inode_unlock;
1630         }
1631
1632         /*
1633          * We update c/mtime for these changes
1634          */
1635         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1636         if (IS_ERR(handle)) {
1637                 ret = PTR_ERR(handle);
1638                 mlog_errno(ret);
1639                 goto out_inode_unlock;
1640         }
1641
1642         if (change_size && i_size_read(inode) < size)
1643                 i_size_write(inode, size);
1644
1645         inode->i_ctime = inode->i_mtime = CURRENT_TIME;
1646         ret = ocfs2_mark_inode_dirty(handle, inode, di_bh);
1647         if (ret < 0)
1648                 mlog_errno(ret);
1649
1650         ocfs2_commit_trans(osb, handle);
1651
1652 out_inode_unlock:
1653         brelse(di_bh);
1654         ocfs2_inode_unlock(inode, 1);
1655 out_rw_unlock:
1656         ocfs2_rw_unlock(inode, 1);
1657
1658 out:
1659         mutex_unlock(&inode->i_mutex);
1660         return ret;
1661 }
1662
1663 int ocfs2_change_file_space(struct file *file, unsigned int cmd,
1664                             struct ocfs2_space_resv *sr)
1665 {
1666         struct inode *inode = file->f_path.dentry->d_inode;
1667         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1668
1669         if ((cmd == OCFS2_IOC_RESVSP || cmd == OCFS2_IOC_RESVSP64) &&
1670             !ocfs2_writes_unwritten_extents(osb))
1671                 return -ENOTTY;
1672         else if ((cmd == OCFS2_IOC_UNRESVSP || cmd == OCFS2_IOC_UNRESVSP64) &&
1673                  !ocfs2_sparse_alloc(osb))
1674                 return -ENOTTY;
1675
1676         if (!S_ISREG(inode->i_mode))
1677                 return -EINVAL;
1678
1679         if (!(file->f_mode & FMODE_WRITE))
1680                 return -EBADF;
1681
1682         return __ocfs2_change_file_space(file, inode, file->f_pos, cmd, sr, 0);
1683 }
1684
1685 static long ocfs2_fallocate(struct inode *inode, int mode, loff_t offset,
1686                             loff_t len)
1687 {
1688         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1689         struct ocfs2_space_resv sr;
1690         int change_size = 1;
1691
1692         if (!ocfs2_writes_unwritten_extents(osb))
1693                 return -EOPNOTSUPP;
1694
1695         if (S_ISDIR(inode->i_mode))
1696                 return -ENODEV;
1697
1698         if (mode & FALLOC_FL_KEEP_SIZE)
1699                 change_size = 0;
1700
1701         sr.l_whence = 0;
1702         sr.l_start = (s64)offset;
1703         sr.l_len = (s64)len;
1704
1705         return __ocfs2_change_file_space(NULL, inode, offset,
1706                                          OCFS2_IOC_RESVSP64, &sr, change_size);
1707 }
1708
1709 int ocfs2_check_range_for_refcount(struct inode *inode, loff_t pos,
1710                                    size_t count)
1711 {
1712         int ret = 0;
1713         unsigned int extent_flags;
1714         u32 cpos, clusters, extent_len, phys_cpos;
1715         struct super_block *sb = inode->i_sb;
1716
1717         if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb)) ||
1718             !(OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL) ||
1719             OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
1720                 return 0;
1721
1722         cpos = pos >> OCFS2_SB(sb)->s_clustersize_bits;
1723         clusters = ocfs2_clusters_for_bytes(sb, pos + count) - cpos;
1724
1725         while (clusters) {
1726                 ret = ocfs2_get_clusters(inode, cpos, &phys_cpos, &extent_len,
1727                                          &extent_flags);
1728                 if (ret < 0) {
1729                         mlog_errno(ret);
1730                         goto out;
1731                 }
1732
1733                 if (phys_cpos && (extent_flags & OCFS2_EXT_REFCOUNTED)) {
1734                         ret = 1;
1735                         break;
1736                 }
1737
1738                 if (extent_len > clusters)
1739                         extent_len = clusters;
1740
1741                 clusters -= extent_len;
1742                 cpos += extent_len;
1743         }
1744 out:
1745         return ret;
1746 }
1747
1748 static int ocfs2_prepare_inode_for_refcount(struct inode *inode,
1749                                             loff_t pos, size_t count,
1750                                             int *meta_level)
1751 {
1752         int ret;
1753         struct buffer_head *di_bh = NULL;
1754         u32 cpos = pos >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
1755         u32 clusters =
1756                 ocfs2_clusters_for_bytes(inode->i_sb, pos + count) - cpos;
1757
1758         ret = ocfs2_inode_lock(inode, &di_bh, 1);
1759         if (ret) {
1760                 mlog_errno(ret);
1761                 goto out;
1762         }
1763
1764         *meta_level = 1;
1765
1766         ret = ocfs2_refcount_cow(inode, di_bh, cpos, clusters, UINT_MAX);
1767         if (ret)
1768                 mlog_errno(ret);
1769 out:
1770         brelse(di_bh);
1771         return ret;
1772 }
1773
1774 static int ocfs2_prepare_inode_for_write(struct dentry *dentry,
1775                                          loff_t *ppos,
1776                                          size_t count,
1777                                          int appending,
1778                                          int *direct_io,
1779                                          int *has_refcount)
1780 {
1781         int ret = 0, meta_level = 0;
1782         struct inode *inode = dentry->d_inode;
1783         loff_t saved_pos, end;
1784
1785         /*
1786          * We start with a read level meta lock and only jump to an ex
1787          * if we need to make modifications here.
1788          */
1789         for(;;) {
1790                 ret = ocfs2_inode_lock(inode, NULL, meta_level);
1791                 if (ret < 0) {
1792                         meta_level = -1;
1793                         mlog_errno(ret);
1794                         goto out;
1795                 }
1796
1797                 /* Clear suid / sgid if necessary. We do this here
1798                  * instead of later in the write path because
1799                  * remove_suid() calls ->setattr without any hint that
1800                  * we may have already done our cluster locking. Since
1801                  * ocfs2_setattr() *must* take cluster locks to
1802                  * proceeed, this will lead us to recursively lock the
1803                  * inode. There's also the dinode i_size state which
1804                  * can be lost via setattr during extending writes (we
1805                  * set inode->i_size at the end of a write. */
1806                 if (should_remove_suid(dentry)) {
1807                         if (meta_level == 0) {
1808                                 ocfs2_inode_unlock(inode, meta_level);
1809                                 meta_level = 1;
1810                                 continue;
1811                         }
1812
1813                         ret = ocfs2_write_remove_suid(inode);
1814                         if (ret < 0) {
1815                                 mlog_errno(ret);
1816                                 goto out_unlock;
1817                         }
1818                 }
1819
1820                 /* work on a copy of ppos until we're sure that we won't have
1821                  * to recalculate it due to relocking. */
1822                 if (appending) {
1823                         saved_pos = i_size_read(inode);
1824                         mlog(0, "O_APPEND: inode->i_size=%llu\n", saved_pos);
1825                 } else {
1826                         saved_pos = *ppos;
1827                 }
1828
1829                 end = saved_pos + count;
1830
1831                 ret = ocfs2_check_range_for_refcount(inode, saved_pos, count);
1832                 if (ret == 1) {
1833                         ocfs2_inode_unlock(inode, meta_level);
1834                         meta_level = -1;
1835
1836                         ret = ocfs2_prepare_inode_for_refcount(inode,
1837                                                                saved_pos,
1838                                                                count,
1839                                                                &meta_level);
1840                         if (has_refcount)
1841                                 *has_refcount = 1;
1842                         if (direct_io)
1843                                 *direct_io = 0;
1844                 }
1845
1846                 if (ret < 0) {
1847                         mlog_errno(ret);
1848                         goto out_unlock;
1849                 }
1850
1851                 /*
1852                  * Skip the O_DIRECT checks if we don't need
1853                  * them.
1854                  */
1855                 if (!direct_io || !(*direct_io))
1856                         break;
1857
1858                 /*
1859                  * There's no sane way to do direct writes to an inode
1860                  * with inline data.
1861                  */
1862                 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1863                         *direct_io = 0;
1864                         break;
1865                 }
1866
1867                 /*
1868                  * Allowing concurrent direct writes means
1869                  * i_size changes wouldn't be synchronized, so
1870                  * one node could wind up truncating another
1871                  * nodes writes.
1872                  */
1873                 if (end > i_size_read(inode)) {
1874                         *direct_io = 0;
1875                         break;
1876                 }
1877
1878                 /*
1879                  * We don't fill holes during direct io, so
1880                  * check for them here. If any are found, the
1881                  * caller will have to retake some cluster
1882                  * locks and initiate the io as buffered.
1883                  */
1884                 ret = ocfs2_check_range_for_holes(inode, saved_pos, count);
1885                 if (ret == 1) {
1886                         *direct_io = 0;
1887                         ret = 0;
1888                 } else if (ret < 0)
1889                         mlog_errno(ret);
1890                 break;
1891         }
1892
1893         if (appending)
1894                 *ppos = saved_pos;
1895
1896 out_unlock:
1897         if (meta_level >= 0)
1898                 ocfs2_inode_unlock(inode, meta_level);
1899
1900 out:
1901         return ret;
1902 }
1903
1904 static ssize_t ocfs2_file_aio_write(struct kiocb *iocb,
1905                                     const struct iovec *iov,
1906                                     unsigned long nr_segs,
1907                                     loff_t pos)
1908 {
1909         int ret, direct_io, appending, rw_level, have_alloc_sem  = 0;
1910         int can_do_direct, has_refcount = 0;
1911         ssize_t written = 0;
1912         size_t ocount;          /* original count */
1913         size_t count;           /* after file limit checks */
1914         loff_t old_size, *ppos = &iocb->ki_pos;
1915         u32 old_clusters;
1916         struct file *file = iocb->ki_filp;
1917         struct inode *inode = file->f_path.dentry->d_inode;
1918         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1919
1920         mlog_entry("(0x%p, %u, '%.*s')\n", file,
1921                    (unsigned int)nr_segs,
1922                    file->f_path.dentry->d_name.len,
1923                    file->f_path.dentry->d_name.name);
1924
1925         if (iocb->ki_left == 0)
1926                 return 0;
1927
1928         vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE);
1929
1930         appending = file->f_flags & O_APPEND ? 1 : 0;
1931         direct_io = file->f_flags & O_DIRECT ? 1 : 0;
1932
1933         mutex_lock(&inode->i_mutex);
1934
1935 relock:
1936         /* to match setattr's i_mutex -> i_alloc_sem -> rw_lock ordering */
1937         if (direct_io) {
1938                 down_read(&inode->i_alloc_sem);
1939                 have_alloc_sem = 1;
1940         }
1941
1942         /* concurrent O_DIRECT writes are allowed */
1943         rw_level = !direct_io;
1944         ret = ocfs2_rw_lock(inode, rw_level);
1945         if (ret < 0) {
1946                 mlog_errno(ret);
1947                 goto out_sems;
1948         }
1949
1950         can_do_direct = direct_io;
1951         ret = ocfs2_prepare_inode_for_write(file->f_path.dentry, ppos,
1952                                             iocb->ki_left, appending,
1953                                             &can_do_direct, &has_refcount);
1954         if (ret < 0) {
1955                 mlog_errno(ret);
1956                 goto out;
1957         }
1958
1959         /*
1960          * We can't complete the direct I/O as requested, fall back to
1961          * buffered I/O.
1962          */
1963         if (direct_io && !can_do_direct) {
1964                 ocfs2_rw_unlock(inode, rw_level);
1965                 up_read(&inode->i_alloc_sem);
1966
1967                 have_alloc_sem = 0;
1968                 rw_level = -1;
1969
1970                 direct_io = 0;
1971                 goto relock;
1972         }
1973
1974         /*
1975          * To later detect whether a journal commit for sync writes is
1976          * necessary, we sample i_size, and cluster count here.
1977          */
1978         old_size = i_size_read(inode);
1979         old_clusters = OCFS2_I(inode)->ip_clusters;
1980
1981         /* communicate with ocfs2_dio_end_io */
1982         ocfs2_iocb_set_rw_locked(iocb, rw_level);
1983
1984         if (direct_io) {
1985                 ret = generic_segment_checks(iov, &nr_segs, &ocount,
1986                                              VERIFY_READ);
1987                 if (ret)
1988                         goto out_dio;
1989
1990                 count = ocount;
1991                 ret = generic_write_checks(file, ppos, &count,
1992                                            S_ISBLK(inode->i_mode));
1993                 if (ret)
1994                         goto out_dio;
1995
1996                 written = generic_file_direct_write(iocb, iov, &nr_segs, *ppos,
1997                                                     ppos, count, ocount);
1998                 if (written < 0) {
1999                         /*
2000                          * direct write may have instantiated a few
2001                          * blocks outside i_size. Trim these off again.
2002                          * Don't need i_size_read because we hold i_mutex.
2003                          */
2004                         if (*ppos + count > inode->i_size)
2005                                 vmtruncate(inode, inode->i_size);
2006                         ret = written;
2007                         goto out_dio;
2008                 }
2009         } else {
2010                 written = __generic_file_aio_write(iocb, iov, nr_segs, ppos);
2011         }
2012
2013 out_dio:
2014         /* buffered aio wouldn't have proper lock coverage today */
2015         BUG_ON(ret == -EIOCBQUEUED && !(file->f_flags & O_DIRECT));
2016
2017         if (((file->f_flags & O_DSYNC) && !direct_io) || IS_SYNC(inode) ||
2018             ((file->f_flags & O_DIRECT) && has_refcount)) {
2019                 ret = filemap_fdatawrite_range(file->f_mapping, pos,
2020                                                pos + count - 1);
2021                 if (ret < 0)
2022                         written = ret;
2023
2024                 if (!ret && (old_size != i_size_read(inode) ||
2025                     old_clusters != OCFS2_I(inode)->ip_clusters ||
2026                     has_refcount)) {
2027                         ret = jbd2_journal_force_commit(osb->journal->j_journal);
2028                         if (ret < 0)
2029                                 written = ret;
2030                 }
2031
2032                 if (!ret)
2033                         ret = filemap_fdatawait_range(file->f_mapping, pos,
2034                                                       pos + count - 1);
2035         }
2036
2037         /*
2038          * deep in g_f_a_w_n()->ocfs2_direct_IO we pass in a ocfs2_dio_end_io
2039          * function pointer which is called when o_direct io completes so that
2040          * it can unlock our rw lock.  (it's the clustered equivalent of
2041          * i_alloc_sem; protects truncate from racing with pending ios).
2042          * Unfortunately there are error cases which call end_io and others
2043          * that don't.  so we don't have to unlock the rw_lock if either an
2044          * async dio is going to do it in the future or an end_io after an
2045          * error has already done it.
2046          */
2047         if ((ret == -EIOCBQUEUED) || (!ocfs2_iocb_is_rw_locked(iocb))) {
2048                 rw_level = -1;
2049                 have_alloc_sem = 0;
2050         }
2051
2052 out:
2053         if (rw_level != -1)
2054                 ocfs2_rw_unlock(inode, rw_level);
2055
2056 out_sems:
2057         if (have_alloc_sem)
2058                 up_read(&inode->i_alloc_sem);
2059
2060         mutex_unlock(&inode->i_mutex);
2061
2062         if (written)
2063                 ret = written;
2064         mlog_exit(ret);
2065         return ret;
2066 }
2067
2068 static int ocfs2_splice_to_file(struct pipe_inode_info *pipe,
2069                                 struct file *out,
2070                                 struct splice_desc *sd)
2071 {
2072         int ret;
2073
2074         ret = ocfs2_prepare_inode_for_write(out->f_path.dentry, &sd->pos,
2075                                             sd->total_len, 0, NULL, NULL);
2076         if (ret < 0) {
2077                 mlog_errno(ret);
2078                 return ret;
2079         }
2080
2081         return splice_from_pipe_feed(pipe, sd, pipe_to_file);
2082 }
2083
2084 static ssize_t ocfs2_file_splice_write(struct pipe_inode_info *pipe,
2085                                        struct file *out,
2086                                        loff_t *ppos,
2087                                        size_t len,
2088                                        unsigned int flags)
2089 {
2090         int ret;
2091         struct address_space *mapping = out->f_mapping;
2092         struct inode *inode = mapping->host;
2093         struct splice_desc sd = {
2094                 .total_len = len,
2095                 .flags = flags,
2096                 .pos = *ppos,
2097                 .u.file = out,
2098         };
2099
2100         mlog_entry("(0x%p, 0x%p, %u, '%.*s')\n", out, pipe,
2101                    (unsigned int)len,
2102                    out->f_path.dentry->d_name.len,
2103                    out->f_path.dentry->d_name.name);
2104
2105         if (pipe->inode)
2106                 mutex_lock_nested(&pipe->inode->i_mutex, I_MUTEX_PARENT);
2107
2108         splice_from_pipe_begin(&sd);
2109         do {
2110                 ret = splice_from_pipe_next(pipe, &sd);
2111                 if (ret <= 0)
2112                         break;
2113
2114                 mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD);
2115                 ret = ocfs2_rw_lock(inode, 1);
2116                 if (ret < 0)
2117                         mlog_errno(ret);
2118                 else {
2119                         ret = ocfs2_splice_to_file(pipe, out, &sd);
2120                         ocfs2_rw_unlock(inode, 1);
2121                 }
2122                 mutex_unlock(&inode->i_mutex);
2123         } while (ret > 0);
2124         splice_from_pipe_end(pipe, &sd);
2125
2126         if (pipe->inode)
2127                 mutex_unlock(&pipe->inode->i_mutex);
2128
2129         if (sd.num_spliced)
2130                 ret = sd.num_spliced;
2131
2132         if (ret > 0) {
2133                 unsigned long nr_pages;
2134                 int err;
2135
2136                 nr_pages = (ret + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
2137
2138                 err = generic_write_sync(out, *ppos, ret);
2139                 if (err)
2140                         ret = err;
2141                 else
2142                         *ppos += ret;
2143
2144                 balance_dirty_pages_ratelimited_nr(mapping, nr_pages);
2145         }
2146
2147         mlog_exit(ret);
2148         return ret;
2149 }
2150
2151 static ssize_t ocfs2_file_splice_read(struct file *in,
2152                                       loff_t *ppos,
2153                                       struct pipe_inode_info *pipe,
2154                                       size_t len,
2155                                       unsigned int flags)
2156 {
2157         int ret = 0, lock_level = 0;
2158         struct inode *inode = in->f_path.dentry->d_inode;
2159
2160         mlog_entry("(0x%p, 0x%p, %u, '%.*s')\n", in, pipe,
2161                    (unsigned int)len,
2162                    in->f_path.dentry->d_name.len,
2163                    in->f_path.dentry->d_name.name);
2164
2165         /*
2166          * See the comment in ocfs2_file_aio_read()
2167          */
2168         ret = ocfs2_inode_lock_atime(inode, in->f_vfsmnt, &lock_level);
2169         if (ret < 0) {
2170                 mlog_errno(ret);
2171                 goto bail;
2172         }
2173         ocfs2_inode_unlock(inode, lock_level);
2174
2175         ret = generic_file_splice_read(in, ppos, pipe, len, flags);
2176
2177 bail:
2178         mlog_exit(ret);
2179         return ret;
2180 }
2181
2182 static ssize_t ocfs2_file_aio_read(struct kiocb *iocb,
2183                                    const struct iovec *iov,
2184                                    unsigned long nr_segs,
2185                                    loff_t pos)
2186 {
2187         int ret = 0, rw_level = -1, have_alloc_sem = 0, lock_level = 0;
2188         struct file *filp = iocb->ki_filp;
2189         struct inode *inode = filp->f_path.dentry->d_inode;
2190
2191         mlog_entry("(0x%p, %u, '%.*s')\n", filp,
2192                    (unsigned int)nr_segs,
2193                    filp->f_path.dentry->d_name.len,
2194                    filp->f_path.dentry->d_name.name);
2195
2196         if (!inode) {
2197                 ret = -EINVAL;
2198                 mlog_errno(ret);
2199                 goto bail;
2200         }
2201
2202         /*
2203          * buffered reads protect themselves in ->readpage().  O_DIRECT reads
2204          * need locks to protect pending reads from racing with truncate.
2205          */
2206         if (filp->f_flags & O_DIRECT) {
2207                 down_read(&inode->i_alloc_sem);
2208                 have_alloc_sem = 1;
2209
2210                 ret = ocfs2_rw_lock(inode, 0);
2211                 if (ret < 0) {
2212                         mlog_errno(ret);
2213                         goto bail;
2214                 }
2215                 rw_level = 0;
2216                 /* communicate with ocfs2_dio_end_io */
2217                 ocfs2_iocb_set_rw_locked(iocb, rw_level);
2218         }
2219
2220         /*
2221          * We're fine letting folks race truncates and extending
2222          * writes with read across the cluster, just like they can
2223          * locally. Hence no rw_lock during read.
2224          *
2225          * Take and drop the meta data lock to update inode fields
2226          * like i_size. This allows the checks down below
2227          * generic_file_aio_read() a chance of actually working.
2228          */
2229         ret = ocfs2_inode_lock_atime(inode, filp->f_vfsmnt, &lock_level);
2230         if (ret < 0) {
2231                 mlog_errno(ret);
2232                 goto bail;
2233         }
2234         ocfs2_inode_unlock(inode, lock_level);
2235
2236         ret = generic_file_aio_read(iocb, iov, nr_segs, iocb->ki_pos);
2237         if (ret == -EINVAL)
2238                 mlog(0, "generic_file_aio_read returned -EINVAL\n");
2239
2240         /* buffered aio wouldn't have proper lock coverage today */
2241         BUG_ON(ret == -EIOCBQUEUED && !(filp->f_flags & O_DIRECT));
2242
2243         /* see ocfs2_file_aio_write */
2244         if (ret == -EIOCBQUEUED || !ocfs2_iocb_is_rw_locked(iocb)) {
2245                 rw_level = -1;
2246                 have_alloc_sem = 0;
2247         }
2248
2249 bail:
2250         if (have_alloc_sem)
2251                 up_read(&inode->i_alloc_sem);
2252         if (rw_level != -1)
2253                 ocfs2_rw_unlock(inode, rw_level);
2254         mlog_exit(ret);
2255
2256         return ret;
2257 }
2258
2259 const struct inode_operations ocfs2_file_iops = {
2260         .setattr        = ocfs2_setattr,
2261         .getattr        = ocfs2_getattr,
2262         .permission     = ocfs2_permission,
2263         .setxattr       = generic_setxattr,
2264         .getxattr       = generic_getxattr,
2265         .listxattr      = ocfs2_listxattr,
2266         .removexattr    = generic_removexattr,
2267         .fallocate      = ocfs2_fallocate,
2268         .fiemap         = ocfs2_fiemap,
2269 };
2270
2271 const struct inode_operations ocfs2_special_file_iops = {
2272         .setattr        = ocfs2_setattr,
2273         .getattr        = ocfs2_getattr,
2274         .permission     = ocfs2_permission,
2275 };
2276
2277 /*
2278  * Other than ->lock, keep ocfs2_fops and ocfs2_dops in sync with
2279  * ocfs2_fops_no_plocks and ocfs2_dops_no_plocks!
2280  */
2281 const struct file_operations ocfs2_fops = {
2282         .llseek         = generic_file_llseek,
2283         .read           = do_sync_read,
2284         .write          = do_sync_write,
2285         .mmap           = ocfs2_mmap,
2286         .fsync          = ocfs2_sync_file,
2287         .release        = ocfs2_file_release,
2288         .open           = ocfs2_file_open,
2289         .aio_read       = ocfs2_file_aio_read,
2290         .aio_write      = ocfs2_file_aio_write,
2291         .unlocked_ioctl = ocfs2_ioctl,
2292 #ifdef CONFIG_COMPAT
2293         .compat_ioctl   = ocfs2_compat_ioctl,
2294 #endif
2295         .lock           = ocfs2_lock,
2296         .flock          = ocfs2_flock,
2297         .splice_read    = ocfs2_file_splice_read,
2298         .splice_write   = ocfs2_file_splice_write,
2299 };
2300
2301 const struct file_operations ocfs2_dops = {
2302         .llseek         = generic_file_llseek,
2303         .read           = generic_read_dir,
2304         .readdir        = ocfs2_readdir,
2305         .fsync          = ocfs2_sync_file,
2306         .release        = ocfs2_dir_release,
2307         .open           = ocfs2_dir_open,
2308         .unlocked_ioctl = ocfs2_ioctl,
2309 #ifdef CONFIG_COMPAT
2310         .compat_ioctl   = ocfs2_compat_ioctl,
2311 #endif
2312         .lock           = ocfs2_lock,
2313         .flock          = ocfs2_flock,
2314 };
2315
2316 /*
2317  * POSIX-lockless variants of our file_operations.
2318  *
2319  * These will be used if the underlying cluster stack does not support
2320  * posix file locking, if the user passes the "localflocks" mount
2321  * option, or if we have a local-only fs.
2322  *
2323  * ocfs2_flock is in here because all stacks handle UNIX file locks,
2324  * so we still want it in the case of no stack support for
2325  * plocks. Internally, it will do the right thing when asked to ignore
2326  * the cluster.
2327  */
2328 const struct file_operations ocfs2_fops_no_plocks = {
2329         .llseek         = generic_file_llseek,
2330         .read           = do_sync_read,
2331         .write          = do_sync_write,
2332         .mmap           = ocfs2_mmap,
2333         .fsync          = ocfs2_sync_file,
2334         .release        = ocfs2_file_release,
2335         .open           = ocfs2_file_open,
2336         .aio_read       = ocfs2_file_aio_read,
2337         .aio_write      = ocfs2_file_aio_write,
2338         .unlocked_ioctl = ocfs2_ioctl,
2339 #ifdef CONFIG_COMPAT
2340         .compat_ioctl   = ocfs2_compat_ioctl,
2341 #endif
2342         .flock          = ocfs2_flock,
2343         .splice_read    = ocfs2_file_splice_read,
2344         .splice_write   = ocfs2_file_splice_write,
2345 };
2346
2347 const struct file_operations ocfs2_dops_no_plocks = {
2348         .llseek         = generic_file_llseek,
2349         .read           = generic_read_dir,
2350         .readdir        = ocfs2_readdir,
2351         .fsync          = ocfs2_sync_file,
2352         .release        = ocfs2_dir_release,
2353         .open           = ocfs2_dir_open,
2354         .unlocked_ioctl = ocfs2_ioctl,
2355 #ifdef CONFIG_COMPAT
2356         .compat_ioctl   = ocfs2_compat_ioctl,
2357 #endif
2358         .flock          = ocfs2_flock,
2359 };