linux/fs/ocfs2/file.c
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   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#include <linux/blkdev.h>
  40
  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#include "ocfs2_trace.h"
  64
  65#include "buffer_head_io.h"
  66
  67static int ocfs2_init_file_private(struct inode *inode, struct file *file)
  68{
  69        struct ocfs2_file_private *fp;
  70
  71        fp = kzalloc(sizeof(struct ocfs2_file_private), GFP_KERNEL);
  72        if (!fp)
  73                return -ENOMEM;
  74
  75        fp->fp_file = file;
  76        mutex_init(&fp->fp_mutex);
  77        ocfs2_file_lock_res_init(&fp->fp_flock, fp);
  78        file->private_data = fp;
  79
  80        return 0;
  81}
  82
  83static void ocfs2_free_file_private(struct inode *inode, struct file *file)
  84{
  85        struct ocfs2_file_private *fp = file->private_data;
  86        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
  87
  88        if (fp) {
  89                ocfs2_simple_drop_lockres(osb, &fp->fp_flock);
  90                ocfs2_lock_res_free(&fp->fp_flock);
  91                kfree(fp);
  92                file->private_data = NULL;
  93        }
  94}
  95
  96static int ocfs2_file_open(struct inode *inode, struct file *file)
  97{
  98        int status;
  99        int mode = file->f_flags;
 100        struct ocfs2_inode_info *oi = OCFS2_I(inode);
 101
 102        trace_ocfs2_file_open(inode, file, file->f_path.dentry,
 103                              (unsigned long long)OCFS2_I(inode)->ip_blkno,
 104                              file->f_path.dentry->d_name.len,
 105                              file->f_path.dentry->d_name.name, mode);
 106
 107        if (file->f_mode & FMODE_WRITE)
 108                dquot_initialize(inode);
 109
 110        spin_lock(&oi->ip_lock);
 111
 112        /* Check that the inode hasn't been wiped from disk by another
 113         * node. If it hasn't then we're safe as long as we hold the
 114         * spin lock until our increment of open count. */
 115        if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_DELETED) {
 116                spin_unlock(&oi->ip_lock);
 117
 118                status = -ENOENT;
 119                goto leave;
 120        }
 121
 122        if (mode & O_DIRECT)
 123                oi->ip_flags |= OCFS2_INODE_OPEN_DIRECT;
 124
 125        oi->ip_open_count++;
 126        spin_unlock(&oi->ip_lock);
 127
 128        status = ocfs2_init_file_private(inode, file);
 129        if (status) {
 130                /*
 131                 * We want to set open count back if we're failing the
 132                 * open.
 133                 */
 134                spin_lock(&oi->ip_lock);
 135                oi->ip_open_count--;
 136                spin_unlock(&oi->ip_lock);
 137        }
 138
 139leave:
 140        return status;
 141}
 142
 143static int ocfs2_file_release(struct inode *inode, struct file *file)
 144{
 145        struct ocfs2_inode_info *oi = OCFS2_I(inode);
 146
 147        spin_lock(&oi->ip_lock);
 148        if (!--oi->ip_open_count)
 149                oi->ip_flags &= ~OCFS2_INODE_OPEN_DIRECT;
 150
 151        trace_ocfs2_file_release(inode, file, file->f_path.dentry,
 152                                 oi->ip_blkno,
 153                                 file->f_path.dentry->d_name.len,
 154                                 file->f_path.dentry->d_name.name,
 155                                 oi->ip_open_count);
 156        spin_unlock(&oi->ip_lock);
 157
 158        ocfs2_free_file_private(inode, file);
 159
 160        return 0;
 161}
 162
 163static int ocfs2_dir_open(struct inode *inode, struct file *file)
 164{
 165        return ocfs2_init_file_private(inode, file);
 166}
 167
 168static int ocfs2_dir_release(struct inode *inode, struct file *file)
 169{
 170        ocfs2_free_file_private(inode, file);
 171        return 0;
 172}
 173
 174static int ocfs2_sync_file(struct file *file, loff_t start, loff_t end,
 175                           int datasync)
 176{
 177        int err = 0;
 178        journal_t *journal;
 179        struct inode *inode = file->f_mapping->host;
 180        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 181
 182        trace_ocfs2_sync_file(inode, file, file->f_path.dentry,
 183                              OCFS2_I(inode)->ip_blkno,
 184                              file->f_path.dentry->d_name.len,
 185                              file->f_path.dentry->d_name.name,
 186                              (unsigned long long)datasync);
 187
 188        err = filemap_write_and_wait_range(inode->i_mapping, start, end);
 189        if (err)
 190                return err;
 191
 192        /*
 193         * Probably don't need the i_mutex at all in here, just putting it here
 194         * to be consistent with how fsync used to be called, someone more
 195         * familiar with the fs could possibly remove it.
 196         */
 197        mutex_lock(&inode->i_mutex);
 198        if (datasync && !(inode->i_state & I_DIRTY_DATASYNC)) {
 199                /*
 200                 * We still have to flush drive's caches to get data to the
 201                 * platter
 202                 */
 203                if (osb->s_mount_opt & OCFS2_MOUNT_BARRIER)
 204                        blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, NULL);
 205                goto bail;
 206        }
 207
 208        journal = osb->journal->j_journal;
 209        err = jbd2_journal_force_commit(journal);
 210
 211bail:
 212        if (err)
 213                mlog_errno(err);
 214        mutex_unlock(&inode->i_mutex);
 215
 216        return (err < 0) ? -EIO : 0;
 217}
 218
 219int ocfs2_should_update_atime(struct inode *inode,
 220                              struct vfsmount *vfsmnt)
 221{
 222        struct timespec now;
 223        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 224
 225        if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
 226                return 0;
 227
 228        if ((inode->i_flags & S_NOATIME) ||
 229            ((inode->i_sb->s_flags & MS_NODIRATIME) && S_ISDIR(inode->i_mode)))
 230                return 0;
 231
 232        /*
 233         * We can be called with no vfsmnt structure - NFSD will
 234         * sometimes do this.
 235         *
 236         * Note that our action here is different than touch_atime() -
 237         * if we can't tell whether this is a noatime mount, then we
 238         * don't know whether to trust the value of s_atime_quantum.
 239         */
 240        if (vfsmnt == NULL)
 241                return 0;
 242
 243        if ((vfsmnt->mnt_flags & MNT_NOATIME) ||
 244            ((vfsmnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
 245                return 0;
 246
 247        if (vfsmnt->mnt_flags & MNT_RELATIME) {
 248                if ((timespec_compare(&inode->i_atime, &inode->i_mtime) <= 0) ||
 249                    (timespec_compare(&inode->i_atime, &inode->i_ctime) <= 0))
 250                        return 1;
 251
 252                return 0;
 253        }
 254
 255        now = CURRENT_TIME;
 256        if ((now.tv_sec - inode->i_atime.tv_sec <= osb->s_atime_quantum))
 257                return 0;
 258        else
 259                return 1;
 260}
 261
 262int ocfs2_update_inode_atime(struct inode *inode,
 263                             struct buffer_head *bh)
 264{
 265        int ret;
 266        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 267        handle_t *handle;
 268        struct ocfs2_dinode *di = (struct ocfs2_dinode *) bh->b_data;
 269
 270        handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
 271        if (IS_ERR(handle)) {
 272                ret = PTR_ERR(handle);
 273                mlog_errno(ret);
 274                goto out;
 275        }
 276
 277        ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), bh,
 278                                      OCFS2_JOURNAL_ACCESS_WRITE);
 279        if (ret) {
 280                mlog_errno(ret);
 281                goto out_commit;
 282        }
 283
 284        /*
 285         * Don't use ocfs2_mark_inode_dirty() here as we don't always
 286         * have i_mutex to guard against concurrent changes to other
 287         * inode fields.
 288         */
 289        inode->i_atime = CURRENT_TIME;
 290        di->i_atime = cpu_to_le64(inode->i_atime.tv_sec);
 291        di->i_atime_nsec = cpu_to_le32(inode->i_atime.tv_nsec);
 292        ocfs2_journal_dirty(handle, bh);
 293
 294out_commit:
 295        ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
 296out:
 297        return ret;
 298}
 299
 300static int ocfs2_set_inode_size(handle_t *handle,
 301                                struct inode *inode,
 302                                struct buffer_head *fe_bh,
 303                                u64 new_i_size)
 304{
 305        int status;
 306
 307        i_size_write(inode, new_i_size);
 308        inode->i_blocks = ocfs2_inode_sector_count(inode);
 309        inode->i_ctime = inode->i_mtime = CURRENT_TIME;
 310
 311        status = ocfs2_mark_inode_dirty(handle, inode, fe_bh);
 312        if (status < 0) {
 313                mlog_errno(status);
 314                goto bail;
 315        }
 316
 317bail:
 318        return status;
 319}
 320
 321int ocfs2_simple_size_update(struct inode *inode,
 322                             struct buffer_head *di_bh,
 323                             u64 new_i_size)
 324{
 325        int ret;
 326        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 327        handle_t *handle = NULL;
 328
 329        handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
 330        if (IS_ERR(handle)) {
 331                ret = PTR_ERR(handle);
 332                mlog_errno(ret);
 333                goto out;
 334        }
 335
 336        ret = ocfs2_set_inode_size(handle, inode, di_bh,
 337                                   new_i_size);
 338        if (ret < 0)
 339                mlog_errno(ret);
 340
 341        ocfs2_commit_trans(osb, handle);
 342out:
 343        return ret;
 344}
 345
 346static int ocfs2_cow_file_pos(struct inode *inode,
 347                              struct buffer_head *fe_bh,
 348                              u64 offset)
 349{
 350        int status;
 351        u32 phys, cpos = offset >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
 352        unsigned int num_clusters = 0;
 353        unsigned int ext_flags = 0;
 354
 355        /*
 356         * If the new offset is aligned to the range of the cluster, there is
 357         * no space for ocfs2_zero_range_for_truncate to fill, so no need to
 358         * CoW either.
 359         */
 360        if ((offset & (OCFS2_SB(inode->i_sb)->s_clustersize - 1)) == 0)
 361                return 0;
 362
 363        status = ocfs2_get_clusters(inode, cpos, &phys,
 364                                    &num_clusters, &ext_flags);
 365        if (status) {
 366                mlog_errno(status);
 367                goto out;
 368        }
 369
 370        if (!(ext_flags & OCFS2_EXT_REFCOUNTED))
 371                goto out;
 372
 373        return ocfs2_refcount_cow(inode, NULL, fe_bh, cpos, 1, cpos+1);
 374
 375out:
 376        return status;
 377}
 378
 379static int ocfs2_orphan_for_truncate(struct ocfs2_super *osb,
 380                                     struct inode *inode,
 381                                     struct buffer_head *fe_bh,
 382                                     u64 new_i_size)
 383{
 384        int status;
 385        handle_t *handle;
 386        struct ocfs2_dinode *di;
 387        u64 cluster_bytes;
 388
 389        /*
 390         * We need to CoW the cluster contains the offset if it is reflinked
 391         * since we will call ocfs2_zero_range_for_truncate later which will
 392         * write "0" from offset to the end of the cluster.
 393         */
 394        status = ocfs2_cow_file_pos(inode, fe_bh, new_i_size);
 395        if (status) {
 396                mlog_errno(status);
 397                return status;
 398        }
 399
 400        /* TODO: This needs to actually orphan the inode in this
 401         * transaction. */
 402
 403        handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
 404        if (IS_ERR(handle)) {
 405                status = PTR_ERR(handle);
 406                mlog_errno(status);
 407                goto out;
 408        }
 409
 410        status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), fe_bh,
 411                                         OCFS2_JOURNAL_ACCESS_WRITE);
 412        if (status < 0) {
 413                mlog_errno(status);
 414                goto out_commit;
 415        }
 416
 417        /*
 418         * Do this before setting i_size.
 419         */
 420        cluster_bytes = ocfs2_align_bytes_to_clusters(inode->i_sb, new_i_size);
 421        status = ocfs2_zero_range_for_truncate(inode, handle, new_i_size,
 422                                               cluster_bytes);
 423        if (status) {
 424                mlog_errno(status);
 425                goto out_commit;
 426        }
 427
 428        i_size_write(inode, new_i_size);
 429        inode->i_ctime = inode->i_mtime = CURRENT_TIME;
 430
 431        di = (struct ocfs2_dinode *) fe_bh->b_data;
 432        di->i_size = cpu_to_le64(new_i_size);
 433        di->i_ctime = di->i_mtime = cpu_to_le64(inode->i_ctime.tv_sec);
 434        di->i_ctime_nsec = di->i_mtime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
 435
 436        ocfs2_journal_dirty(handle, fe_bh);
 437
 438out_commit:
 439        ocfs2_commit_trans(osb, handle);
 440out:
 441        return status;
 442}
 443
 444static int ocfs2_truncate_file(struct inode *inode,
 445                               struct buffer_head *di_bh,
 446                               u64 new_i_size)
 447{
 448        int status = 0;
 449        struct ocfs2_dinode *fe = NULL;
 450        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 451
 452        /* We trust di_bh because it comes from ocfs2_inode_lock(), which
 453         * already validated it */
 454        fe = (struct ocfs2_dinode *) di_bh->b_data;
 455
 456        trace_ocfs2_truncate_file((unsigned long long)OCFS2_I(inode)->ip_blkno,
 457                                  (unsigned long long)le64_to_cpu(fe->i_size),
 458                                  (unsigned long long)new_i_size);
 459
 460        mlog_bug_on_msg(le64_to_cpu(fe->i_size) != i_size_read(inode),
 461                        "Inode %llu, inode i_size = %lld != di "
 462                        "i_size = %llu, i_flags = 0x%x\n",
 463                        (unsigned long long)OCFS2_I(inode)->ip_blkno,
 464                        i_size_read(inode),
 465                        (unsigned long long)le64_to_cpu(fe->i_size),
 466                        le32_to_cpu(fe->i_flags));
 467
 468        if (new_i_size > le64_to_cpu(fe->i_size)) {
 469                trace_ocfs2_truncate_file_error(
 470                        (unsigned long long)le64_to_cpu(fe->i_size),
 471                        (unsigned long long)new_i_size);
 472                status = -EINVAL;
 473                mlog_errno(status);
 474                goto bail;
 475        }
 476
 477        /* lets handle the simple truncate cases before doing any more
 478         * cluster locking. */
 479        if (new_i_size == le64_to_cpu(fe->i_size))
 480                goto bail;
 481
 482        down_write(&OCFS2_I(inode)->ip_alloc_sem);
 483
 484        ocfs2_resv_discard(&osb->osb_la_resmap,
 485                           &OCFS2_I(inode)->ip_la_data_resv);
 486
 487        /*
 488         * The inode lock forced other nodes to sync and drop their
 489         * pages, which (correctly) happens even if we have a truncate
 490         * without allocation change - ocfs2 cluster sizes can be much
 491         * greater than page size, so we have to truncate them
 492         * anyway.
 493         */
 494        unmap_mapping_range(inode->i_mapping, new_i_size + PAGE_SIZE - 1, 0, 1);
 495        truncate_inode_pages(inode->i_mapping, new_i_size);
 496
 497        if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
 498                status = ocfs2_truncate_inline(inode, di_bh, new_i_size,
 499                                               i_size_read(inode), 1);
 500                if (status)
 501                        mlog_errno(status);
 502
 503                goto bail_unlock_sem;
 504        }
 505
 506        /* alright, we're going to need to do a full blown alloc size
 507         * change. Orphan the inode so that recovery can complete the
 508         * truncate if necessary. This does the task of marking
 509         * i_size. */
 510        status = ocfs2_orphan_for_truncate(osb, inode, di_bh, new_i_size);
 511        if (status < 0) {
 512                mlog_errno(status);
 513                goto bail_unlock_sem;
 514        }
 515
 516        status = ocfs2_commit_truncate(osb, inode, di_bh);
 517        if (status < 0) {
 518                mlog_errno(status);
 519                goto bail_unlock_sem;
 520        }
 521
 522        /* TODO: orphan dir cleanup here. */
 523bail_unlock_sem:
 524        up_write(&OCFS2_I(inode)->ip_alloc_sem);
 525
 526bail:
 527        if (!status && OCFS2_I(inode)->ip_clusters == 0)
 528                status = ocfs2_try_remove_refcount_tree(inode, di_bh);
 529
 530        return status;
 531}
 532
 533/*
 534 * extend file allocation only here.
 535 * we'll update all the disk stuff, and oip->alloc_size
 536 *
 537 * expect stuff to be locked, a transaction started and enough data /
 538 * metadata reservations in the contexts.
 539 *
 540 * Will return -EAGAIN, and a reason if a restart is needed.
 541 * If passed in, *reason will always be set, even in error.
 542 */
 543int ocfs2_add_inode_data(struct ocfs2_super *osb,
 544                         struct inode *inode,
 545                         u32 *logical_offset,
 546                         u32 clusters_to_add,
 547                         int mark_unwritten,
 548                         struct buffer_head *fe_bh,
 549                         handle_t *handle,
 550                         struct ocfs2_alloc_context *data_ac,
 551                         struct ocfs2_alloc_context *meta_ac,
 552                         enum ocfs2_alloc_restarted *reason_ret)
 553{
 554        int ret;
 555        struct ocfs2_extent_tree et;
 556
 557        ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), fe_bh);
 558        ret = ocfs2_add_clusters_in_btree(handle, &et, logical_offset,
 559                                          clusters_to_add, mark_unwritten,
 560                                          data_ac, meta_ac, reason_ret);
 561
 562        return ret;
 563}
 564
 565static int __ocfs2_extend_allocation(struct inode *inode, u32 logical_start,
 566                                     u32 clusters_to_add, int mark_unwritten)
 567{
 568        int status = 0;
 569        int restart_func = 0;
 570        int credits;
 571        u32 prev_clusters;
 572        struct buffer_head *bh = NULL;
 573        struct ocfs2_dinode *fe = NULL;
 574        handle_t *handle = NULL;
 575        struct ocfs2_alloc_context *data_ac = NULL;
 576        struct ocfs2_alloc_context *meta_ac = NULL;
 577        enum ocfs2_alloc_restarted why;
 578        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 579        struct ocfs2_extent_tree et;
 580        int did_quota = 0;
 581
 582        /*
 583         * This function only exists for file systems which don't
 584         * support holes.
 585         */
 586        BUG_ON(mark_unwritten && !ocfs2_sparse_alloc(osb));
 587
 588        status = ocfs2_read_inode_block(inode, &bh);
 589        if (status < 0) {
 590                mlog_errno(status);
 591                goto leave;
 592        }
 593        fe = (struct ocfs2_dinode *) bh->b_data;
 594
 595restart_all:
 596        BUG_ON(le32_to_cpu(fe->i_clusters) != OCFS2_I(inode)->ip_clusters);
 597
 598        ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), bh);
 599        status = ocfs2_lock_allocators(inode, &et, clusters_to_add, 0,
 600                                       &data_ac, &meta_ac);
 601        if (status) {
 602                mlog_errno(status);
 603                goto leave;
 604        }
 605
 606        credits = ocfs2_calc_extend_credits(osb->sb, &fe->id2.i_list,
 607                                            clusters_to_add);
 608        handle = ocfs2_start_trans(osb, credits);
 609        if (IS_ERR(handle)) {
 610                status = PTR_ERR(handle);
 611                handle = NULL;
 612                mlog_errno(status);
 613                goto leave;
 614        }
 615
 616restarted_transaction:
 617        trace_ocfs2_extend_allocation(
 618                (unsigned long long)OCFS2_I(inode)->ip_blkno,
 619                (unsigned long long)i_size_read(inode),
 620                le32_to_cpu(fe->i_clusters), clusters_to_add,
 621                why, restart_func);
 622
 623        status = dquot_alloc_space_nodirty(inode,
 624                        ocfs2_clusters_to_bytes(osb->sb, clusters_to_add));
 625        if (status)
 626                goto leave;
 627        did_quota = 1;
 628
 629        /* reserve a write to the file entry early on - that we if we
 630         * run out of credits in the allocation path, we can still
 631         * update i_size. */
 632        status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), bh,
 633                                         OCFS2_JOURNAL_ACCESS_WRITE);
 634        if (status < 0) {
 635                mlog_errno(status);
 636                goto leave;
 637        }
 638
 639        prev_clusters = OCFS2_I(inode)->ip_clusters;
 640
 641        status = ocfs2_add_inode_data(osb,
 642                                      inode,
 643                                      &logical_start,
 644                                      clusters_to_add,
 645                                      mark_unwritten,
 646                                      bh,
 647                                      handle,
 648                                      data_ac,
 649                                      meta_ac,
 650                                      &why);
 651        if ((status < 0) && (status != -EAGAIN)) {
 652                if (status != -ENOSPC)
 653                        mlog_errno(status);
 654                goto leave;
 655        }
 656
 657        ocfs2_journal_dirty(handle, bh);
 658
 659        spin_lock(&OCFS2_I(inode)->ip_lock);
 660        clusters_to_add -= (OCFS2_I(inode)->ip_clusters - prev_clusters);
 661        spin_unlock(&OCFS2_I(inode)->ip_lock);
 662        /* Release unused quota reservation */
 663        dquot_free_space(inode,
 664                        ocfs2_clusters_to_bytes(osb->sb, clusters_to_add));
 665        did_quota = 0;
 666
 667        if (why != RESTART_NONE && clusters_to_add) {
 668                if (why == RESTART_META) {
 669                        restart_func = 1;
 670                        status = 0;
 671                } else {
 672                        BUG_ON(why != RESTART_TRANS);
 673
 674                        /* TODO: This can be more intelligent. */
 675                        credits = ocfs2_calc_extend_credits(osb->sb,
 676                                                            &fe->id2.i_list,
 677                                                            clusters_to_add);
 678                        status = ocfs2_extend_trans(handle, credits);
 679                        if (status < 0) {
 680                                /* handle still has to be committed at
 681                                 * this point. */
 682                                status = -ENOMEM;
 683                                mlog_errno(status);
 684                                goto leave;
 685                        }
 686                        goto restarted_transaction;
 687                }
 688        }
 689
 690        trace_ocfs2_extend_allocation_end(OCFS2_I(inode)->ip_blkno,
 691             le32_to_cpu(fe->i_clusters),
 692             (unsigned long long)le64_to_cpu(fe->i_size),
 693             OCFS2_I(inode)->ip_clusters,
 694             (unsigned long long)i_size_read(inode));
 695
 696leave:
 697        if (status < 0 && did_quota)
 698                dquot_free_space(inode,
 699                        ocfs2_clusters_to_bytes(osb->sb, clusters_to_add));
 700        if (handle) {
 701                ocfs2_commit_trans(osb, handle);
 702                handle = NULL;
 703        }
 704        if (data_ac) {
 705                ocfs2_free_alloc_context(data_ac);
 706                data_ac = NULL;
 707        }
 708        if (meta_ac) {
 709                ocfs2_free_alloc_context(meta_ac);
 710                meta_ac = NULL;
 711        }
 712        if ((!status) && restart_func) {
 713                restart_func = 0;
 714                goto restart_all;
 715        }
 716        brelse(bh);
 717        bh = NULL;
 718
 719        return status;
 720}
 721
 722/*
 723 * While a write will already be ordering the data, a truncate will not.
 724 * Thus, we need to explicitly order the zeroed pages.
 725 */
 726static handle_t *ocfs2_zero_start_ordered_transaction(struct inode *inode)
 727{
 728        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 729        handle_t *handle = NULL;
 730        int ret = 0;
 731
 732        if (!ocfs2_should_order_data(inode))
 733                goto out;
 734
 735        handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
 736        if (IS_ERR(handle)) {
 737                ret = -ENOMEM;
 738                mlog_errno(ret);
 739                goto out;
 740        }
 741
 742        ret = ocfs2_jbd2_file_inode(handle, inode);
 743        if (ret < 0)
 744                mlog_errno(ret);
 745
 746out:
 747        if (ret) {
 748                if (!IS_ERR(handle))
 749                        ocfs2_commit_trans(osb, handle);
 750                handle = ERR_PTR(ret);
 751        }
 752        return handle;
 753}
 754
 755/* Some parts of this taken from generic_cont_expand, which turned out
 756 * to be too fragile to do exactly what we need without us having to
 757 * worry about recursive locking in ->write_begin() and ->write_end(). */
 758static int ocfs2_write_zero_page(struct inode *inode, u64 abs_from,
 759                                 u64 abs_to)
 760{
 761        struct address_space *mapping = inode->i_mapping;
 762        struct page *page;
 763        unsigned long index = abs_from >> PAGE_CACHE_SHIFT;
 764        handle_t *handle = NULL;
 765        int ret = 0;
 766        unsigned zero_from, zero_to, block_start, block_end;
 767
 768        BUG_ON(abs_from >= abs_to);
 769        BUG_ON(abs_to > (((u64)index + 1) << PAGE_CACHE_SHIFT));
 770        BUG_ON(abs_from & (inode->i_blkbits - 1));
 771
 772        page = find_or_create_page(mapping, index, GFP_NOFS);
 773        if (!page) {
 774                ret = -ENOMEM;
 775                mlog_errno(ret);
 776                goto out;
 777        }
 778
 779        /* Get the offsets within the page that we want to zero */
 780        zero_from = abs_from & (PAGE_CACHE_SIZE - 1);
 781        zero_to = abs_to & (PAGE_CACHE_SIZE - 1);
 782        if (!zero_to)
 783                zero_to = PAGE_CACHE_SIZE;
 784
 785        trace_ocfs2_write_zero_page(
 786                        (unsigned long long)OCFS2_I(inode)->ip_blkno,
 787                        (unsigned long long)abs_from,
 788                        (unsigned long long)abs_to,
 789                        index, zero_from, zero_to);
 790
 791        /* We know that zero_from is block aligned */
 792        for (block_start = zero_from; block_start < zero_to;
 793             block_start = block_end) {
 794                block_end = block_start + (1 << inode->i_blkbits);
 795
 796                /*
 797                 * block_start is block-aligned.  Bump it by one to force
 798                 * __block_write_begin and block_commit_write to zero the
 799                 * whole block.
 800                 */
 801                ret = __block_write_begin(page, block_start + 1, 0,
 802                                          ocfs2_get_block);
 803                if (ret < 0) {
 804                        mlog_errno(ret);
 805                        goto out_unlock;
 806                }
 807
 808                if (!handle) {
 809                        handle = ocfs2_zero_start_ordered_transaction(inode);
 810                        if (IS_ERR(handle)) {
 811                                ret = PTR_ERR(handle);
 812                                handle = NULL;
 813                                break;
 814                        }
 815                }
 816
 817                /* must not update i_size! */
 818                ret = block_commit_write(page, block_start + 1,
 819                                         block_start + 1);
 820                if (ret < 0)
 821                        mlog_errno(ret);
 822                else
 823                        ret = 0;
 824        }
 825
 826        if (handle)
 827                ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
 828
 829out_unlock:
 830        unlock_page(page);
 831        page_cache_release(page);
 832out:
 833        return ret;
 834}
 835
 836/*
 837 * Find the next range to zero.  We do this in terms of bytes because
 838 * that's what ocfs2_zero_extend() wants, and it is dealing with the
 839 * pagecache.  We may return multiple extents.
 840 *
 841 * zero_start and zero_end are ocfs2_zero_extend()s current idea of what
 842 * needs to be zeroed.  range_start and range_end return the next zeroing
 843 * range.  A subsequent call should pass the previous range_end as its
 844 * zero_start.  If range_end is 0, there's nothing to do.
 845 *
 846 * Unwritten extents are skipped over.  Refcounted extents are CoWd.
 847 */
 848static int ocfs2_zero_extend_get_range(struct inode *inode,
 849                                       struct buffer_head *di_bh,
 850                                       u64 zero_start, u64 zero_end,
 851                                       u64 *range_start, u64 *range_end)
 852{
 853        int rc = 0, needs_cow = 0;
 854        u32 p_cpos, zero_clusters = 0;
 855        u32 zero_cpos =
 856                zero_start >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
 857        u32 last_cpos = ocfs2_clusters_for_bytes(inode->i_sb, zero_end);
 858        unsigned int num_clusters = 0;
 859        unsigned int ext_flags = 0;
 860
 861        while (zero_cpos < last_cpos) {
 862                rc = ocfs2_get_clusters(inode, zero_cpos, &p_cpos,
 863                                        &num_clusters, &ext_flags);
 864                if (rc) {
 865                        mlog_errno(rc);
 866                        goto out;
 867                }
 868
 869                if (p_cpos && !(ext_flags & OCFS2_EXT_UNWRITTEN)) {
 870                        zero_clusters = num_clusters;
 871                        if (ext_flags & OCFS2_EXT_REFCOUNTED)
 872                                needs_cow = 1;
 873                        break;
 874                }
 875
 876                zero_cpos += num_clusters;
 877        }
 878        if (!zero_clusters) {
 879                *range_end = 0;
 880                goto out;
 881        }
 882
 883        while ((zero_cpos + zero_clusters) < last_cpos) {
 884                rc = ocfs2_get_clusters(inode, zero_cpos + zero_clusters,
 885                                        &p_cpos, &num_clusters,
 886                                        &ext_flags);
 887                if (rc) {
 888                        mlog_errno(rc);
 889                        goto out;
 890                }
 891
 892                if (!p_cpos || (ext_flags & OCFS2_EXT_UNWRITTEN))
 893                        break;
 894                if (ext_flags & OCFS2_EXT_REFCOUNTED)
 895                        needs_cow = 1;
 896                zero_clusters += num_clusters;
 897        }
 898        if ((zero_cpos + zero_clusters) > last_cpos)
 899                zero_clusters = last_cpos - zero_cpos;
 900
 901        if (needs_cow) {
 902                rc = ocfs2_refcount_cow(inode, NULL, di_bh, zero_cpos,
 903                                        zero_clusters, UINT_MAX);
 904                if (rc) {
 905                        mlog_errno(rc);
 906                        goto out;
 907                }
 908        }
 909
 910        *range_start = ocfs2_clusters_to_bytes(inode->i_sb, zero_cpos);
 911        *range_end = ocfs2_clusters_to_bytes(inode->i_sb,
 912                                             zero_cpos + zero_clusters);
 913
 914out:
 915        return rc;
 916}
 917
 918/*
 919 * Zero one range returned from ocfs2_zero_extend_get_range().  The caller
 920 * has made sure that the entire range needs zeroing.
 921 */
 922static int ocfs2_zero_extend_range(struct inode *inode, u64 range_start,
 923                                   u64 range_end)
 924{
 925        int rc = 0;
 926        u64 next_pos;
 927        u64 zero_pos = range_start;
 928
 929        trace_ocfs2_zero_extend_range(
 930                        (unsigned long long)OCFS2_I(inode)->ip_blkno,
 931                        (unsigned long long)range_start,
 932                        (unsigned long long)range_end);
 933        BUG_ON(range_start >= range_end);
 934
 935        while (zero_pos < range_end) {
 936                next_pos = (zero_pos & PAGE_CACHE_MASK) + PAGE_CACHE_SIZE;
 937                if (next_pos > range_end)
 938                        next_pos = range_end;
 939                rc = ocfs2_write_zero_page(inode, zero_pos, next_pos);
 940                if (rc < 0) {
 941                        mlog_errno(rc);
 942                        break;
 943                }
 944                zero_pos = next_pos;
 945
 946                /*
 947                 * Very large extends have the potential to lock up
 948                 * the cpu for extended periods of time.
 949                 */
 950                cond_resched();
 951        }
 952
 953        return rc;
 954}
 955
 956int ocfs2_zero_extend(struct inode *inode, struct buffer_head *di_bh,
 957                      loff_t zero_to_size)
 958{
 959        int ret = 0;
 960        u64 zero_start, range_start = 0, range_end = 0;
 961        struct super_block *sb = inode->i_sb;
 962
 963        zero_start = ocfs2_align_bytes_to_blocks(sb, i_size_read(inode));
 964        trace_ocfs2_zero_extend((unsigned long long)OCFS2_I(inode)->ip_blkno,
 965                                (unsigned long long)zero_start,
 966                                (unsigned long long)i_size_read(inode));
 967        while (zero_start < zero_to_size) {
 968                ret = ocfs2_zero_extend_get_range(inode, di_bh, zero_start,
 969                                                  zero_to_size,
 970                                                  &range_start,
 971                                                  &range_end);
 972                if (ret) {
 973                        mlog_errno(ret);
 974                        break;
 975                }
 976                if (!range_end)
 977                        break;
 978                /* Trim the ends */
 979                if (range_start < zero_start)
 980                        range_start = zero_start;
 981                if (range_end > zero_to_size)
 982                        range_end = zero_to_size;
 983
 984                ret = ocfs2_zero_extend_range(inode, range_start,
 985                                              range_end);
 986                if (ret) {
 987                        mlog_errno(ret);
 988                        break;
 989                }
 990                zero_start = range_end;
 991        }
 992
 993        return ret;
 994}
 995
 996int ocfs2_extend_no_holes(struct inode *inode, struct buffer_head *di_bh,
 997                          u64 new_i_size, u64 zero_to)
 998{
 999        int ret;
1000        u32 clusters_to_add;
1001        struct ocfs2_inode_info *oi = OCFS2_I(inode);
1002
1003        /*
1004         * Only quota files call this without a bh, and they can't be
1005         * refcounted.
1006         */
1007        BUG_ON(!di_bh && (oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL));
1008        BUG_ON(!di_bh && !(oi->ip_flags & OCFS2_INODE_SYSTEM_FILE));
1009
1010        clusters_to_add = ocfs2_clusters_for_bytes(inode->i_sb, new_i_size);
1011        if (clusters_to_add < oi->ip_clusters)
1012                clusters_to_add = 0;
1013        else
1014                clusters_to_add -= oi->ip_clusters;
1015
1016        if (clusters_to_add) {
1017                ret = __ocfs2_extend_allocation(inode, oi->ip_clusters,
1018                                                clusters_to_add, 0);
1019                if (ret) {
1020                        mlog_errno(ret);
1021                        goto out;
1022                }
1023        }
1024
1025        /*
1026         * Call this even if we don't add any clusters to the tree. We
1027         * still need to zero the area between the old i_size and the
1028         * new i_size.
1029         */
1030        ret = ocfs2_zero_extend(inode, di_bh, zero_to);
1031        if (ret < 0)
1032                mlog_errno(ret);
1033
1034out:
1035        return ret;
1036}
1037
1038static int ocfs2_extend_file(struct inode *inode,
1039                             struct buffer_head *di_bh,
1040                             u64 new_i_size)
1041{
1042        int ret = 0;
1043        struct ocfs2_inode_info *oi = OCFS2_I(inode);
1044
1045        BUG_ON(!di_bh);
1046
1047        /* setattr sometimes calls us like this. */
1048        if (new_i_size == 0)
1049                goto out;
1050
1051        if (i_size_read(inode) == new_i_size)
1052                goto out;
1053        BUG_ON(new_i_size < i_size_read(inode));
1054
1055        /*
1056         * The alloc sem blocks people in read/write from reading our
1057         * allocation until we're done changing it. We depend on
1058         * i_mutex to block other extend/truncate calls while we're
1059         * here.  We even have to hold it for sparse files because there
1060         * might be some tail zeroing.
1061         */
1062        down_write(&oi->ip_alloc_sem);
1063
1064        if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1065                /*
1066                 * We can optimize small extends by keeping the inodes
1067                 * inline data.
1068                 */
1069                if (ocfs2_size_fits_inline_data(di_bh, new_i_size)) {
1070                        up_write(&oi->ip_alloc_sem);
1071                        goto out_update_size;
1072                }
1073
1074                ret = ocfs2_convert_inline_data_to_extents(inode, di_bh);
1075                if (ret) {
1076                        up_write(&oi->ip_alloc_sem);
1077                        mlog_errno(ret);
1078                        goto out;
1079                }
1080        }
1081
1082        if (ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)))
1083                ret = ocfs2_zero_extend(inode, di_bh, new_i_size);
1084        else
1085                ret = ocfs2_extend_no_holes(inode, di_bh, new_i_size,
1086                                            new_i_size);
1087
1088        up_write(&oi->ip_alloc_sem);
1089
1090        if (ret < 0) {
1091                mlog_errno(ret);
1092                goto out;
1093        }
1094
1095out_update_size:
1096        ret = ocfs2_simple_size_update(inode, di_bh, new_i_size);
1097        if (ret < 0)
1098                mlog_errno(ret);
1099
1100out:
1101        return ret;
1102}
1103
1104int ocfs2_setattr(struct dentry *dentry, struct iattr *attr)
1105{
1106        int status = 0, size_change;
1107        struct inode *inode = dentry->d_inode;
1108        struct super_block *sb = inode->i_sb;
1109        struct ocfs2_super *osb = OCFS2_SB(sb);
1110        struct buffer_head *bh = NULL;
1111        handle_t *handle = NULL;
1112        struct dquot *transfer_to[MAXQUOTAS] = { };
1113        int qtype;
1114
1115        trace_ocfs2_setattr(inode, dentry,
1116                            (unsigned long long)OCFS2_I(inode)->ip_blkno,
1117                            dentry->d_name.len, dentry->d_name.name,
1118                            attr->ia_valid, attr->ia_mode,
1119                            attr->ia_uid, attr->ia_gid);
1120
1121        /* ensuring we don't even attempt to truncate a symlink */
1122        if (S_ISLNK(inode->i_mode))
1123                attr->ia_valid &= ~ATTR_SIZE;
1124
1125#define OCFS2_VALID_ATTRS (ATTR_ATIME | ATTR_MTIME | ATTR_CTIME | ATTR_SIZE \
1126                           | ATTR_GID | ATTR_UID | ATTR_MODE)
1127        if (!(attr->ia_valid & OCFS2_VALID_ATTRS))
1128                return 0;
1129
1130        status = inode_change_ok(inode, attr);
1131        if (status)
1132                return status;
1133
1134        if (is_quota_modification(inode, attr))
1135                dquot_initialize(inode);
1136        size_change = S_ISREG(inode->i_mode) && attr->ia_valid & ATTR_SIZE;
1137        if (size_change) {
1138                status = ocfs2_rw_lock(inode, 1);
1139                if (status < 0) {
1140                        mlog_errno(status);
1141                        goto bail;
1142                }
1143        }
1144
1145        status = ocfs2_inode_lock(inode, &bh, 1);
1146        if (status < 0) {
1147                if (status != -ENOENT)
1148                        mlog_errno(status);
1149                goto bail_unlock_rw;
1150        }
1151
1152        if (size_change && attr->ia_size != i_size_read(inode)) {
1153                status = inode_newsize_ok(inode, attr->ia_size);
1154                if (status)
1155                        goto bail_unlock;
1156
1157                inode_dio_wait(inode);
1158
1159                if (i_size_read(inode) > attr->ia_size) {
1160                        if (ocfs2_should_order_data(inode)) {
1161                                status = ocfs2_begin_ordered_truncate(inode,
1162                                                                      attr->ia_size);
1163                                if (status)
1164                                        goto bail_unlock;
1165                        }
1166                        status = ocfs2_truncate_file(inode, bh, attr->ia_size);
1167                } else
1168                        status = ocfs2_extend_file(inode, bh, attr->ia_size);
1169                if (status < 0) {
1170                        if (status != -ENOSPC)
1171                                mlog_errno(status);
1172                        status = -ENOSPC;
1173                        goto bail_unlock;
1174                }
1175        }
1176
1177        if ((attr->ia_valid & ATTR_UID && attr->ia_uid != inode->i_uid) ||
1178            (attr->ia_valid & ATTR_GID && attr->ia_gid != inode->i_gid)) {
1179                /*
1180                 * Gather pointers to quota structures so that allocation /
1181                 * freeing of quota structures happens here and not inside
1182                 * dquot_transfer() where we have problems with lock ordering
1183                 */
1184                if (attr->ia_valid & ATTR_UID && attr->ia_uid != inode->i_uid
1185                    && OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1186                    OCFS2_FEATURE_RO_COMPAT_USRQUOTA)) {
1187                        transfer_to[USRQUOTA] = dqget(sb, attr->ia_uid,
1188                                                      USRQUOTA);
1189                        if (!transfer_to[USRQUOTA]) {
1190                                status = -ESRCH;
1191                                goto bail_unlock;
1192                        }
1193                }
1194                if (attr->ia_valid & ATTR_GID && attr->ia_gid != inode->i_gid
1195                    && OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1196                    OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)) {
1197                        transfer_to[GRPQUOTA] = dqget(sb, attr->ia_gid,
1198                                                      GRPQUOTA);
1199                        if (!transfer_to[GRPQUOTA]) {
1200                                status = -ESRCH;
1201                                goto bail_unlock;
1202                        }
1203                }
1204                handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS +
1205                                           2 * ocfs2_quota_trans_credits(sb));
1206                if (IS_ERR(handle)) {
1207                        status = PTR_ERR(handle);
1208                        mlog_errno(status);
1209                        goto bail_unlock;
1210                }
1211                status = __dquot_transfer(inode, transfer_to);
1212                if (status < 0)
1213                        goto bail_commit;
1214        } else {
1215                handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1216                if (IS_ERR(handle)) {
1217                        status = PTR_ERR(handle);
1218                        mlog_errno(status);
1219                        goto bail_unlock;
1220                }
1221        }
1222
1223        /*
1224         * This will intentionally not wind up calling truncate_setsize(),
1225         * since all the work for a size change has been done above.
1226         * Otherwise, we could get into problems with truncate as
1227         * ip_alloc_sem is used there to protect against i_size
1228         * changes.
1229         *
1230         * XXX: this means the conditional below can probably be removed.
1231         */
1232        if ((attr->ia_valid & ATTR_SIZE) &&
1233            attr->ia_size != i_size_read(inode)) {
1234                status = vmtruncate(inode, attr->ia_size);
1235                if (status) {
1236                        mlog_errno(status);
1237                        goto bail_commit;
1238                }
1239        }
1240
1241        setattr_copy(inode, attr);
1242        mark_inode_dirty(inode);
1243
1244        status = ocfs2_mark_inode_dirty(handle, inode, bh);
1245        if (status < 0)
1246                mlog_errno(status);
1247
1248bail_commit:
1249        ocfs2_commit_trans(osb, handle);
1250bail_unlock:
1251        ocfs2_inode_unlock(inode, 1);
1252bail_unlock_rw:
1253        if (size_change)
1254                ocfs2_rw_unlock(inode, 1);
1255bail:
1256        brelse(bh);
1257
1258        /* Release quota pointers in case we acquired them */
1259        for (qtype = 0; qtype < MAXQUOTAS; qtype++)
1260                dqput(transfer_to[qtype]);
1261
1262        if (!status && attr->ia_valid & ATTR_MODE) {
1263                status = ocfs2_acl_chmod(inode);
1264                if (status < 0)
1265                        mlog_errno(status);
1266        }
1267
1268        return status;
1269}
1270
1271int ocfs2_getattr(struct vfsmount *mnt,
1272                  struct dentry *dentry,
1273                  struct kstat *stat)
1274{
1275        struct inode *inode = dentry->d_inode;
1276        struct super_block *sb = dentry->d_inode->i_sb;
1277        struct ocfs2_super *osb = sb->s_fs_info;
1278        int err;
1279
1280        err = ocfs2_inode_revalidate(dentry);
1281        if (err) {
1282                if (err != -ENOENT)
1283                        mlog_errno(err);
1284                goto bail;
1285        }
1286
1287        generic_fillattr(inode, stat);
1288
1289        /* We set the blksize from the cluster size for performance */
1290        stat->blksize = osb->s_clustersize;
1291
1292bail:
1293        return err;
1294}
1295
1296int ocfs2_permission(struct inode *inode, int mask)
1297{
1298        int ret;
1299
1300        if (mask & MAY_NOT_BLOCK)
1301                return -ECHILD;
1302
1303        ret = ocfs2_inode_lock(inode, NULL, 0);
1304        if (ret) {
1305                if (ret != -ENOENT)
1306                        mlog_errno(ret);
1307                goto out;
1308        }
1309
1310        ret = generic_permission(inode, mask);
1311
1312        ocfs2_inode_unlock(inode, 0);
1313out:
1314        return ret;
1315}
1316
1317static int __ocfs2_write_remove_suid(struct inode *inode,
1318                                     struct buffer_head *bh)
1319{
1320        int ret;
1321        handle_t *handle;
1322        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1323        struct ocfs2_dinode *di;
1324
1325        trace_ocfs2_write_remove_suid(
1326                        (unsigned long long)OCFS2_I(inode)->ip_blkno,
1327                        inode->i_mode);
1328
1329        handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1330        if (IS_ERR(handle)) {
1331                ret = PTR_ERR(handle);
1332                mlog_errno(ret);
1333                goto out;
1334        }
1335
1336        ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), bh,
1337                                      OCFS2_JOURNAL_ACCESS_WRITE);
1338        if (ret < 0) {
1339                mlog_errno(ret);
1340                goto out_trans;
1341        }
1342
1343        inode->i_mode &= ~S_ISUID;
1344        if ((inode->i_mode & S_ISGID) && (inode->i_mode & S_IXGRP))
1345                inode->i_mode &= ~S_ISGID;
1346
1347        di = (struct ocfs2_dinode *) bh->b_data;
1348        di->i_mode = cpu_to_le16(inode->i_mode);
1349
1350        ocfs2_journal_dirty(handle, bh);
1351
1352out_trans:
1353        ocfs2_commit_trans(osb, handle);
1354out:
1355        return ret;
1356}
1357
1358/*
1359 * Will look for holes and unwritten extents in the range starting at
1360 * pos for count bytes (inclusive).
1361 */
1362static int ocfs2_check_range_for_holes(struct inode *inode, loff_t pos,
1363                                       size_t count)
1364{
1365        int ret = 0;
1366        unsigned int extent_flags;
1367        u32 cpos, clusters, extent_len, phys_cpos;
1368        struct super_block *sb = inode->i_sb;
1369
1370        cpos = pos >> OCFS2_SB(sb)->s_clustersize_bits;
1371        clusters = ocfs2_clusters_for_bytes(sb, pos + count) - cpos;
1372
1373        while (clusters) {
1374                ret = ocfs2_get_clusters(inode, cpos, &phys_cpos, &extent_len,
1375                                         &extent_flags);
1376                if (ret < 0) {
1377                        mlog_errno(ret);
1378                        goto out;
1379                }
1380
1381                if (phys_cpos == 0 || (extent_flags & OCFS2_EXT_UNWRITTEN)) {
1382                        ret = 1;
1383                        break;
1384                }
1385
1386                if (extent_len > clusters)
1387                        extent_len = clusters;
1388
1389                clusters -= extent_len;
1390                cpos += extent_len;
1391        }
1392out:
1393        return ret;
1394}
1395
1396static int ocfs2_write_remove_suid(struct inode *inode)
1397{
1398        int ret;
1399        struct buffer_head *bh = NULL;
1400
1401        ret = ocfs2_read_inode_block(inode, &bh);
1402        if (ret < 0) {
1403                mlog_errno(ret);
1404                goto out;
1405        }
1406
1407        ret =  __ocfs2_write_remove_suid(inode, bh);
1408out:
1409        brelse(bh);
1410        return ret;
1411}
1412
1413/*
1414 * Allocate enough extents to cover the region starting at byte offset
1415 * start for len bytes. Existing extents are skipped, any extents
1416 * added are marked as "unwritten".
1417 */
1418static int ocfs2_allocate_unwritten_extents(struct inode *inode,
1419                                            u64 start, u64 len)
1420{
1421        int ret;
1422        u32 cpos, phys_cpos, clusters, alloc_size;
1423        u64 end = start + len;
1424        struct buffer_head *di_bh = NULL;
1425
1426        if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1427                ret = ocfs2_read_inode_block(inode, &di_bh);
1428                if (ret) {
1429                        mlog_errno(ret);
1430                        goto out;
1431                }
1432
1433                /*
1434                 * Nothing to do if the requested reservation range
1435                 * fits within the inode.
1436                 */
1437                if (ocfs2_size_fits_inline_data(di_bh, end))
1438                        goto out;
1439
1440                ret = ocfs2_convert_inline_data_to_extents(inode, di_bh);
1441                if (ret) {
1442                        mlog_errno(ret);
1443                        goto out;
1444                }
1445        }
1446
1447        /*
1448         * We consider both start and len to be inclusive.
1449         */
1450        cpos = start >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
1451        clusters = ocfs2_clusters_for_bytes(inode->i_sb, start + len);
1452        clusters -= cpos;
1453
1454        while (clusters) {
1455                ret = ocfs2_get_clusters(inode, cpos, &phys_cpos,
1456                                         &alloc_size, NULL);
1457                if (ret) {
1458                        mlog_errno(ret);
1459                        goto out;
1460                }
1461
1462                /*
1463                 * Hole or existing extent len can be arbitrary, so
1464                 * cap it to our own allocation request.
1465                 */
1466                if (alloc_size > clusters)
1467                        alloc_size = clusters;
1468
1469                if (phys_cpos) {
1470                        /*
1471                         * We already have an allocation at this
1472                         * region so we can safely skip it.
1473                         */
1474                        goto next;
1475                }
1476
1477                ret = __ocfs2_extend_allocation(inode, cpos, alloc_size, 1);
1478                if (ret) {
1479                        if (ret != -ENOSPC)
1480                                mlog_errno(ret);
1481                        goto out;
1482                }
1483
1484next:
1485                cpos += alloc_size;
1486                clusters -= alloc_size;
1487        }
1488
1489        ret = 0;
1490out:
1491
1492        brelse(di_bh);
1493        return ret;
1494}
1495
1496/*
1497 * Truncate a byte range, avoiding pages within partial clusters. This
1498 * preserves those pages for the zeroing code to write to.
1499 */
1500static void ocfs2_truncate_cluster_pages(struct inode *inode, u64 byte_start,
1501                                         u64 byte_len)
1502{
1503        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1504        loff_t start, end;
1505        struct address_space *mapping = inode->i_mapping;
1506
1507        start = (loff_t)ocfs2_align_bytes_to_clusters(inode->i_sb, byte_start);
1508        end = byte_start + byte_len;
1509        end = end & ~(osb->s_clustersize - 1);
1510
1511        if (start < end) {
1512                unmap_mapping_range(mapping, start, end - start, 0);
1513                truncate_inode_pages_range(mapping, start, end - 1);
1514        }
1515}
1516
1517static int ocfs2_zero_partial_clusters(struct inode *inode,
1518                                       u64 start, u64 len)
1519{
1520        int ret = 0;
1521        u64 tmpend, end = start + len;
1522        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1523        unsigned int csize = osb->s_clustersize;
1524        handle_t *handle;
1525
1526        /*
1527         * The "start" and "end" values are NOT necessarily part of
1528         * the range whose allocation is being deleted. Rather, this
1529         * is what the user passed in with the request. We must zero
1530         * partial clusters here. There's no need to worry about
1531         * physical allocation - the zeroing code knows to skip holes.
1532         */
1533        trace_ocfs2_zero_partial_clusters(
1534                (unsigned long long)OCFS2_I(inode)->ip_blkno,
1535                (unsigned long long)start, (unsigned long long)end);
1536
1537        /*
1538         * If both edges are on a cluster boundary then there's no
1539         * zeroing required as the region is part of the allocation to
1540         * be truncated.
1541         */
1542        if ((start & (csize - 1)) == 0 && (end & (csize - 1)) == 0)
1543                goto out;
1544
1545        handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1546        if (IS_ERR(handle)) {
1547                ret = PTR_ERR(handle);
1548                mlog_errno(ret);
1549                goto out;
1550        }
1551
1552        /*
1553         * We want to get the byte offset of the end of the 1st cluster.
1554         */
1555        tmpend = (u64)osb->s_clustersize + (start & ~(osb->s_clustersize - 1));
1556        if (tmpend > end)
1557                tmpend = end;
1558
1559        trace_ocfs2_zero_partial_clusters_range1((unsigned long long)start,
1560                                                 (unsigned long long)tmpend);
1561
1562        ret = ocfs2_zero_range_for_truncate(inode, handle, start, tmpend);
1563        if (ret)
1564                mlog_errno(ret);
1565
1566        if (tmpend < end) {
1567                /*
1568                 * This may make start and end equal, but the zeroing
1569                 * code will skip any work in that case so there's no
1570                 * need to catch it up here.
1571                 */
1572                start = end & ~(osb->s_clustersize - 1);
1573
1574                trace_ocfs2_zero_partial_clusters_range2(
1575                        (unsigned long long)start, (unsigned long long)end);
1576
1577                ret = ocfs2_zero_range_for_truncate(inode, handle, start, end);
1578                if (ret)
1579                        mlog_errno(ret);
1580        }
1581
1582        ocfs2_commit_trans(osb, handle);
1583out:
1584        return ret;
1585}
1586
1587static int ocfs2_find_rec(struct ocfs2_extent_list *el, u32 pos)
1588{
1589        int i;
1590        struct ocfs2_extent_rec *rec = NULL;
1591
1592        for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) {
1593
1594                rec = &el->l_recs[i];
1595
1596                if (le32_to_cpu(rec->e_cpos) < pos)
1597                        break;
1598        }
1599
1600        return i;
1601}
1602
1603/*
1604 * Helper to calculate the punching pos and length in one run, we handle the
1605 * following three cases in order:
1606 *
1607 * - remove the entire record
1608 * - remove a partial record
1609 * - no record needs to be removed (hole-punching completed)
1610*/
1611static void ocfs2_calc_trunc_pos(struct inode *inode,
1612                                 struct ocfs2_extent_list *el,
1613                                 struct ocfs2_extent_rec *rec,
1614                                 u32 trunc_start, u32 *trunc_cpos,
1615                                 u32 *trunc_len, u32 *trunc_end,
1616                                 u64 *blkno, int *done)
1617{
1618        int ret = 0;
1619        u32 coff, range;
1620
1621        range = le32_to_cpu(rec->e_cpos) + ocfs2_rec_clusters(el, rec);
1622
1623        if (le32_to_cpu(rec->e_cpos) >= trunc_start) {
1624                /*
1625                 * remove an entire extent record.
1626                 */
1627                *trunc_cpos = le32_to_cpu(rec->e_cpos);
1628                /*
1629                 * Skip holes if any.
1630                 */
1631                if (range < *trunc_end)
1632                        *trunc_end = range;
1633                *trunc_len = *trunc_end - le32_to_cpu(rec->e_cpos);
1634                *blkno = le64_to_cpu(rec->e_blkno);
1635                *trunc_end = le32_to_cpu(rec->e_cpos);
1636        } else if (range > trunc_start) {
1637                /*
1638                 * remove a partial extent record, which means we're
1639                 * removing the last extent record.
1640                 */
1641                *trunc_cpos = trunc_start;
1642                /*
1643                 * skip hole if any.
1644                 */
1645                if (range < *trunc_end)
1646                        *trunc_end = range;
1647                *trunc_len = *trunc_end - trunc_start;
1648                coff = trunc_start - le32_to_cpu(rec->e_cpos);
1649                *blkno = le64_to_cpu(rec->e_blkno) +
1650                                ocfs2_clusters_to_blocks(inode->i_sb, coff);
1651                *trunc_end = trunc_start;
1652        } else {
1653                /*
1654                 * It may have two following possibilities:
1655                 *
1656                 * - last record has been removed
1657                 * - trunc_start was within a hole
1658                 *
1659                 * both two cases mean the completion of hole punching.
1660                 */
1661                ret = 1;
1662        }
1663
1664        *done = ret;
1665}
1666
1667static int ocfs2_remove_inode_range(struct inode *inode,
1668                                    struct buffer_head *di_bh, u64 byte_start,
1669                                    u64 byte_len)
1670{
1671        int ret = 0, flags = 0, done = 0, i;
1672        u32 trunc_start, trunc_len, trunc_end, trunc_cpos, phys_cpos;
1673        u32 cluster_in_el;
1674        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1675        struct ocfs2_cached_dealloc_ctxt dealloc;
1676        struct address_space *mapping = inode->i_mapping;
1677        struct ocfs2_extent_tree et;
1678        struct ocfs2_path *path = NULL;
1679        struct ocfs2_extent_list *el = NULL;
1680        struct ocfs2_extent_rec *rec = NULL;
1681        struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
1682        u64 blkno, refcount_loc = le64_to_cpu(di->i_refcount_loc);
1683
1684        ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), di_bh);
1685        ocfs2_init_dealloc_ctxt(&dealloc);
1686
1687        trace_ocfs2_remove_inode_range(
1688                        (unsigned long long)OCFS2_I(inode)->ip_blkno,
1689                        (unsigned long long)byte_start,
1690                        (unsigned long long)byte_len);
1691
1692        if (byte_len == 0)
1693                return 0;
1694
1695        if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1696                ret = ocfs2_truncate_inline(inode, di_bh, byte_start,
1697                                            byte_start + byte_len, 0);
1698                if (ret) {
1699                        mlog_errno(ret);
1700                        goto out;
1701                }
1702                /*
1703                 * There's no need to get fancy with the page cache
1704                 * truncate of an inline-data inode. We're talking
1705                 * about less than a page here, which will be cached
1706                 * in the dinode buffer anyway.
1707                 */
1708                unmap_mapping_range(mapping, 0, 0, 0);
1709                truncate_inode_pages(mapping, 0);
1710                goto out;
1711        }
1712
1713        /*
1714         * For reflinks, we may need to CoW 2 clusters which might be
1715         * partially zero'd later, if hole's start and end offset were
1716         * within one cluster(means is not exactly aligned to clustersize).
1717         */
1718
1719        if (OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL) {
1720
1721                ret = ocfs2_cow_file_pos(inode, di_bh, byte_start);
1722                if (ret) {
1723                        mlog_errno(ret);
1724                        goto out;
1725                }
1726
1727                ret = ocfs2_cow_file_pos(inode, di_bh, byte_start + byte_len);
1728                if (ret) {
1729                        mlog_errno(ret);
1730                        goto out;
1731                }
1732        }
1733
1734        trunc_start = ocfs2_clusters_for_bytes(osb->sb, byte_start);
1735        trunc_end = (byte_start + byte_len) >> osb->s_clustersize_bits;
1736        cluster_in_el = trunc_end;
1737
1738        ret = ocfs2_zero_partial_clusters(inode, byte_start, byte_len);
1739        if (ret) {
1740                mlog_errno(ret);
1741                goto out;
1742        }
1743
1744        path = ocfs2_new_path_from_et(&et);
1745        if (!path) {
1746                ret = -ENOMEM;
1747                mlog_errno(ret);
1748                goto out;
1749        }
1750
1751        while (trunc_end > trunc_start) {
1752
1753                ret = ocfs2_find_path(INODE_CACHE(inode), path,
1754                                      cluster_in_el);
1755                if (ret) {
1756                        mlog_errno(ret);
1757                        goto out;
1758                }
1759
1760                el = path_leaf_el(path);
1761
1762                i = ocfs2_find_rec(el, trunc_end);
1763                /*
1764                 * Need to go to previous extent block.
1765                 */
1766                if (i < 0) {
1767                        if (path->p_tree_depth == 0)
1768                                break;
1769
1770                        ret = ocfs2_find_cpos_for_left_leaf(inode->i_sb,
1771                                                            path,
1772                                                            &cluster_in_el);
1773                        if (ret) {
1774                                mlog_errno(ret);
1775                                goto out;
1776                        }
1777
1778                        /*
1779                         * We've reached the leftmost extent block,
1780                         * it's safe to leave.
1781                         */
1782                        if (cluster_in_el == 0)
1783                                break;
1784
1785                        /*
1786                         * The 'pos' searched for previous extent block is
1787                         * always one cluster less than actual trunc_end.
1788                         */
1789                        trunc_end = cluster_in_el + 1;
1790
1791                        ocfs2_reinit_path(path, 1);
1792
1793                        continue;
1794
1795                } else
1796                        rec = &el->l_recs[i];
1797
1798                ocfs2_calc_trunc_pos(inode, el, rec, trunc_start, &trunc_cpos,
1799                                     &trunc_len, &trunc_end, &blkno, &done);
1800                if (done)
1801                        break;
1802
1803                flags = rec->e_flags;
1804                phys_cpos = ocfs2_blocks_to_clusters(inode->i_sb, blkno);
1805
1806                ret = ocfs2_remove_btree_range(inode, &et, trunc_cpos,
1807                                               phys_cpos, trunc_len, flags,
1808                                               &dealloc, refcount_loc);
1809                if (ret < 0) {
1810                        mlog_errno(ret);
1811                        goto out;
1812                }
1813
1814                cluster_in_el = trunc_end;
1815
1816                ocfs2_reinit_path(path, 1);
1817        }
1818
1819        ocfs2_truncate_cluster_pages(inode, byte_start, byte_len);
1820
1821out:
1822        ocfs2_schedule_truncate_log_flush(osb, 1);
1823        ocfs2_run_deallocs(osb, &dealloc);
1824
1825        return ret;
1826}
1827
1828/*
1829 * Parts of this function taken from xfs_change_file_space()
1830 */
1831static int __ocfs2_change_file_space(struct file *file, struct inode *inode,
1832                                     loff_t f_pos, unsigned int cmd,
1833                                     struct ocfs2_space_resv *sr,
1834                                     int change_size)
1835{
1836        int ret;
1837        s64 llen;
1838        loff_t size;
1839        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1840        struct buffer_head *di_bh = NULL;
1841        handle_t *handle;
1842        unsigned long long max_off = inode->i_sb->s_maxbytes;
1843
1844        if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
1845                return -EROFS;
1846
1847        mutex_lock(&inode->i_mutex);
1848
1849        /*
1850         * This prevents concurrent writes on other nodes
1851         */
1852        ret = ocfs2_rw_lock(inode, 1);
1853        if (ret) {
1854                mlog_errno(ret);
1855                goto out;
1856        }
1857
1858        ret = ocfs2_inode_lock(inode, &di_bh, 1);
1859        if (ret) {
1860                mlog_errno(ret);
1861                goto out_rw_unlock;
1862        }
1863
1864        if (inode->i_flags & (S_IMMUTABLE|S_APPEND)) {
1865                ret = -EPERM;
1866                goto out_inode_unlock;
1867        }
1868
1869        switch (sr->l_whence) {
1870        case 0: /*SEEK_SET*/
1871                break;
1872        case 1: /*SEEK_CUR*/
1873                sr->l_start += f_pos;
1874                break;
1875        case 2: /*SEEK_END*/
1876                sr->l_start += i_size_read(inode);
1877                break;
1878        default:
1879                ret = -EINVAL;
1880                goto out_inode_unlock;
1881        }
1882        sr->l_whence = 0;
1883
1884        llen = sr->l_len > 0 ? sr->l_len - 1 : sr->l_len;
1885
1886        if (sr->l_start < 0
1887            || sr->l_start > max_off
1888            || (sr->l_start + llen) < 0
1889            || (sr->l_start + llen) > max_off) {
1890                ret = -EINVAL;
1891                goto out_inode_unlock;
1892        }
1893        size = sr->l_start + sr->l_len;
1894
1895        if (cmd == OCFS2_IOC_RESVSP || cmd == OCFS2_IOC_RESVSP64) {
1896                if (sr->l_len <= 0) {
1897                        ret = -EINVAL;
1898                        goto out_inode_unlock;
1899                }
1900        }
1901
1902        if (file && should_remove_suid(file->f_path.dentry)) {
1903                ret = __ocfs2_write_remove_suid(inode, di_bh);
1904                if (ret) {
1905                        mlog_errno(ret);
1906                        goto out_inode_unlock;
1907                }
1908        }
1909
1910        down_write(&OCFS2_I(inode)->ip_alloc_sem);
1911        switch (cmd) {
1912        case OCFS2_IOC_RESVSP:
1913        case OCFS2_IOC_RESVSP64:
1914                /*
1915                 * This takes unsigned offsets, but the signed ones we
1916                 * pass have been checked against overflow above.
1917                 */
1918                ret = ocfs2_allocate_unwritten_extents(inode, sr->l_start,
1919                                                       sr->l_len);
1920                break;
1921        case OCFS2_IOC_UNRESVSP:
1922        case OCFS2_IOC_UNRESVSP64:
1923                ret = ocfs2_remove_inode_range(inode, di_bh, sr->l_start,
1924                                               sr->l_len);
1925                break;
1926        default:
1927                ret = -EINVAL;
1928        }
1929        up_write(&OCFS2_I(inode)->ip_alloc_sem);
1930        if (ret) {
1931                mlog_errno(ret);
1932                goto out_inode_unlock;
1933        }
1934
1935        /*
1936         * We update c/mtime for these changes
1937         */
1938        handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1939        if (IS_ERR(handle)) {
1940                ret = PTR_ERR(handle);
1941                mlog_errno(ret);
1942                goto out_inode_unlock;
1943        }
1944
1945        if (change_size && i_size_read(inode) < size)
1946                i_size_write(inode, size);
1947
1948        inode->i_ctime = inode->i_mtime = CURRENT_TIME;
1949        ret = ocfs2_mark_inode_dirty(handle, inode, di_bh);
1950        if (ret < 0)
1951                mlog_errno(ret);
1952
1953        if (file && (file->f_flags & O_SYNC))
1954                handle->h_sync = 1;
1955
1956        ocfs2_commit_trans(osb, handle);
1957
1958out_inode_unlock:
1959        brelse(di_bh);
1960        ocfs2_inode_unlock(inode, 1);
1961out_rw_unlock:
1962        ocfs2_rw_unlock(inode, 1);
1963
1964out:
1965        mutex_unlock(&inode->i_mutex);
1966        return ret;
1967}
1968
1969int ocfs2_change_file_space(struct file *file, unsigned int cmd,
1970                            struct ocfs2_space_resv *sr)
1971{
1972        struct inode *inode = file->f_path.dentry->d_inode;
1973        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1974        int ret;
1975
1976        if ((cmd == OCFS2_IOC_RESVSP || cmd == OCFS2_IOC_RESVSP64) &&
1977            !ocfs2_writes_unwritten_extents(osb))
1978                return -ENOTTY;
1979        else if ((cmd == OCFS2_IOC_UNRESVSP || cmd == OCFS2_IOC_UNRESVSP64) &&
1980                 !ocfs2_sparse_alloc(osb))
1981                return -ENOTTY;
1982
1983        if (!S_ISREG(inode->i_mode))
1984                return -EINVAL;
1985
1986        if (!(file->f_mode & FMODE_WRITE))
1987                return -EBADF;
1988
1989        ret = mnt_want_write_file(file);
1990        if (ret)
1991                return ret;
1992        ret = __ocfs2_change_file_space(file, inode, file->f_pos, cmd, sr, 0);
1993        mnt_drop_write_file(file);
1994        return ret;
1995}
1996
1997static long ocfs2_fallocate(struct file *file, int mode, loff_t offset,
1998                            loff_t len)
1999{
2000        struct inode *inode = file->f_path.dentry->d_inode;
2001        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2002        struct ocfs2_space_resv sr;
2003        int change_size = 1;
2004        int cmd = OCFS2_IOC_RESVSP64;
2005
2006        if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
2007                return -EOPNOTSUPP;
2008        if (!ocfs2_writes_unwritten_extents(osb))
2009                return -EOPNOTSUPP;
2010
2011        if (mode & FALLOC_FL_KEEP_SIZE)
2012                change_size = 0;
2013
2014        if (mode & FALLOC_FL_PUNCH_HOLE)
2015                cmd = OCFS2_IOC_UNRESVSP64;
2016
2017        sr.l_whence = 0;
2018        sr.l_start = (s64)offset;
2019        sr.l_len = (s64)len;
2020
2021        return __ocfs2_change_file_space(NULL, inode, offset, cmd, &sr,
2022                                         change_size);
2023}
2024
2025int ocfs2_check_range_for_refcount(struct inode *inode, loff_t pos,
2026                                   size_t count)
2027{
2028        int ret = 0;
2029        unsigned int extent_flags;
2030        u32 cpos, clusters, extent_len, phys_cpos;
2031        struct super_block *sb = inode->i_sb;
2032
2033        if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb)) ||
2034            !(OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL) ||
2035            OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
2036                return 0;
2037
2038        cpos = pos >> OCFS2_SB(sb)->s_clustersize_bits;
2039        clusters = ocfs2_clusters_for_bytes(sb, pos + count) - cpos;
2040
2041        while (clusters) {
2042                ret = ocfs2_get_clusters(inode, cpos, &phys_cpos, &extent_len,
2043                                         &extent_flags);
2044                if (ret < 0) {
2045                        mlog_errno(ret);
2046                        goto out;
2047                }
2048
2049                if (phys_cpos && (extent_flags & OCFS2_EXT_REFCOUNTED)) {
2050                        ret = 1;
2051                        break;
2052                }
2053
2054                if (extent_len > clusters)
2055                        extent_len = clusters;
2056
2057                clusters -= extent_len;
2058                cpos += extent_len;
2059        }
2060out:
2061        return ret;
2062}
2063
2064static void ocfs2_aiodio_wait(struct inode *inode)
2065{
2066        wait_queue_head_t *wq = ocfs2_ioend_wq(inode);
2067
2068        wait_event(*wq, (atomic_read(&OCFS2_I(inode)->ip_unaligned_aio) == 0));
2069}
2070
2071static int ocfs2_is_io_unaligned(struct inode *inode, size_t count, loff_t pos)
2072{
2073        int blockmask = inode->i_sb->s_blocksize - 1;
2074        loff_t final_size = pos + count;
2075
2076        if ((pos & blockmask) || (final_size & blockmask))
2077                return 1;
2078        return 0;
2079}
2080
2081static int ocfs2_prepare_inode_for_refcount(struct inode *inode,
2082                                            struct file *file,
2083                                            loff_t pos, size_t count,
2084                                            int *meta_level)
2085{
2086        int ret;
2087        struct buffer_head *di_bh = NULL;
2088        u32 cpos = pos >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
2089        u32 clusters =
2090                ocfs2_clusters_for_bytes(inode->i_sb, pos + count) - cpos;
2091
2092        ret = ocfs2_inode_lock(inode, &di_bh, 1);
2093        if (ret) {
2094                mlog_errno(ret);
2095                goto out;
2096        }
2097
2098        *meta_level = 1;
2099
2100        ret = ocfs2_refcount_cow(inode, file, di_bh, cpos, clusters, UINT_MAX);
2101        if (ret)
2102                mlog_errno(ret);
2103out:
2104        brelse(di_bh);
2105        return ret;
2106}
2107
2108static int ocfs2_prepare_inode_for_write(struct file *file,
2109                                         loff_t *ppos,
2110                                         size_t count,
2111                                         int appending,
2112                                         int *direct_io,
2113                                         int *has_refcount)
2114{
2115        int ret = 0, meta_level = 0;
2116        struct dentry *dentry = file->f_path.dentry;
2117        struct inode *inode = dentry->d_inode;
2118        loff_t saved_pos = 0, end;
2119
2120        /*
2121         * We start with a read level meta lock and only jump to an ex
2122         * if we need to make modifications here.
2123         */
2124        for(;;) {
2125                ret = ocfs2_inode_lock(inode, NULL, meta_level);
2126                if (ret < 0) {
2127                        meta_level = -1;
2128                        mlog_errno(ret);
2129                        goto out;
2130                }
2131
2132                /* Clear suid / sgid if necessary. We do this here
2133                 * instead of later in the write path because
2134                 * remove_suid() calls ->setattr without any hint that
2135                 * we may have already done our cluster locking. Since
2136                 * ocfs2_setattr() *must* take cluster locks to
2137                 * proceed, this will lead us to recursively lock the
2138                 * inode. There's also the dinode i_size state which
2139                 * can be lost via setattr during extending writes (we
2140                 * set inode->i_size at the end of a write. */
2141                if (should_remove_suid(dentry)) {
2142                        if (meta_level == 0) {
2143                                ocfs2_inode_unlock(inode, meta_level);
2144                                meta_level = 1;
2145                                continue;
2146                        }
2147
2148                        ret = ocfs2_write_remove_suid(inode);
2149                        if (ret < 0) {
2150                                mlog_errno(ret);
2151                                goto out_unlock;
2152                        }
2153                }
2154
2155                /* work on a copy of ppos until we're sure that we won't have
2156                 * to recalculate it due to relocking. */
2157                if (appending)
2158                        saved_pos = i_size_read(inode);
2159                else
2160                        saved_pos = *ppos;
2161
2162                end = saved_pos + count;
2163
2164                ret = ocfs2_check_range_for_refcount(inode, saved_pos, count);
2165                if (ret == 1) {
2166                        ocfs2_inode_unlock(inode, meta_level);
2167                        meta_level = -1;
2168
2169                        ret = ocfs2_prepare_inode_for_refcount(inode,
2170                                                               file,
2171                                                               saved_pos,
2172                                                               count,
2173                                                               &meta_level);
2174                        if (has_refcount)
2175                                *has_refcount = 1;
2176                        if (direct_io)
2177                                *direct_io = 0;
2178                }
2179
2180                if (ret < 0) {
2181                        mlog_errno(ret);
2182                        goto out_unlock;
2183                }
2184
2185                /*
2186                 * Skip the O_DIRECT checks if we don't need
2187                 * them.
2188                 */
2189                if (!direct_io || !(*direct_io))
2190                        break;
2191
2192                /*
2193                 * There's no sane way to do direct writes to an inode
2194                 * with inline data.
2195                 */
2196                if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
2197                        *direct_io = 0;
2198                        break;
2199                }
2200
2201                /*
2202                 * Allowing concurrent direct writes means
2203                 * i_size changes wouldn't be synchronized, so
2204                 * one node could wind up truncating another
2205                 * nodes writes.
2206                 */
2207                if (end > i_size_read(inode)) {
2208                        *direct_io = 0;
2209                        break;
2210                }
2211
2212                /*
2213                 * We don't fill holes during direct io, so
2214                 * check for them here. If any are found, the
2215                 * caller will have to retake some cluster
2216                 * locks and initiate the io as buffered.
2217                 */
2218                ret = ocfs2_check_range_for_holes(inode, saved_pos, count);
2219                if (ret == 1) {
2220                        *direct_io = 0;
2221                        ret = 0;
2222                } else if (ret < 0)
2223                        mlog_errno(ret);
2224                break;
2225        }
2226
2227        if (appending)
2228                *ppos = saved_pos;
2229
2230out_unlock:
2231        trace_ocfs2_prepare_inode_for_write(OCFS2_I(inode)->ip_blkno,
2232                                            saved_pos, appending, count,
2233                                            direct_io, has_refcount);
2234
2235        if (meta_level >= 0)
2236                ocfs2_inode_unlock(inode, meta_level);
2237
2238out:
2239        return ret;
2240}
2241
2242static ssize_t ocfs2_file_aio_write(struct kiocb *iocb,
2243                                    const struct iovec *iov,
2244                                    unsigned long nr_segs,
2245                                    loff_t pos)
2246{
2247        int ret, direct_io, appending, rw_level, have_alloc_sem  = 0;
2248        int can_do_direct, has_refcount = 0;
2249        ssize_t written = 0;
2250        size_t ocount;          /* original count */
2251        size_t count;           /* after file limit checks */
2252        loff_t old_size, *ppos = &iocb->ki_pos;
2253        u32 old_clusters;
2254        struct file *file = iocb->ki_filp;
2255        struct inode *inode = file->f_path.dentry->d_inode;
2256        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2257        int full_coherency = !(osb->s_mount_opt &
2258                               OCFS2_MOUNT_COHERENCY_BUFFERED);
2259        int unaligned_dio = 0;
2260
2261        trace_ocfs2_file_aio_write(inode, file, file->f_path.dentry,
2262                (unsigned long long)OCFS2_I(inode)->ip_blkno,
2263                file->f_path.dentry->d_name.len,
2264                file->f_path.dentry->d_name.name,
2265                (unsigned int)nr_segs);
2266
2267        if (iocb->ki_left == 0)
2268                return 0;
2269
2270        sb_start_write(inode->i_sb);
2271
2272        appending = file->f_flags & O_APPEND ? 1 : 0;
2273        direct_io = file->f_flags & O_DIRECT ? 1 : 0;
2274
2275        mutex_lock(&inode->i_mutex);
2276
2277        ocfs2_iocb_clear_sem_locked(iocb);
2278
2279relock:
2280        /* to match setattr's i_mutex -> rw_lock ordering */
2281        if (direct_io) {
2282                have_alloc_sem = 1;
2283                /* communicate with ocfs2_dio_end_io */
2284                ocfs2_iocb_set_sem_locked(iocb);
2285        }
2286
2287        /*
2288         * Concurrent O_DIRECT writes are allowed with
2289         * mount_option "coherency=buffered".
2290         */
2291        rw_level = (!direct_io || full_coherency);
2292
2293        ret = ocfs2_rw_lock(inode, rw_level);
2294        if (ret < 0) {
2295                mlog_errno(ret);
2296                goto out_sems;
2297        }
2298
2299        /*
2300         * O_DIRECT writes with "coherency=full" need to take EX cluster
2301         * inode_lock to guarantee coherency.
2302         */
2303        if (direct_io && full_coherency) {
2304                /*
2305                 * We need to take and drop the inode lock to force
2306                 * other nodes to drop their caches.  Buffered I/O
2307                 * already does this in write_begin().
2308                 */
2309                ret = ocfs2_inode_lock(inode, NULL, 1);
2310                if (ret < 0) {
2311                        mlog_errno(ret);
2312                        goto out_sems;
2313                }
2314
2315                ocfs2_inode_unlock(inode, 1);
2316        }
2317
2318        can_do_direct = direct_io;
2319        ret = ocfs2_prepare_inode_for_write(file, ppos,
2320                                            iocb->ki_left, appending,
2321                                            &can_do_direct, &has_refcount);
2322        if (ret < 0) {
2323                mlog_errno(ret);
2324                goto out;
2325        }
2326
2327        if (direct_io && !is_sync_kiocb(iocb))
2328                unaligned_dio = ocfs2_is_io_unaligned(inode, iocb->ki_left,
2329                                                      *ppos);
2330
2331        /*
2332         * We can't complete the direct I/O as requested, fall back to
2333         * buffered I/O.
2334         */
2335        if (direct_io && !can_do_direct) {
2336                ocfs2_rw_unlock(inode, rw_level);
2337
2338                have_alloc_sem = 0;
2339                rw_level = -1;
2340
2341                direct_io = 0;
2342                goto relock;
2343        }
2344
2345        if (unaligned_dio) {
2346                /*
2347                 * Wait on previous unaligned aio to complete before
2348                 * proceeding.
2349                 */
2350                ocfs2_aiodio_wait(inode);
2351
2352                /* Mark the iocb as needing a decrement in ocfs2_dio_end_io */
2353                atomic_inc(&OCFS2_I(inode)->ip_unaligned_aio);
2354                ocfs2_iocb_set_unaligned_aio(iocb);
2355        }
2356
2357        /*
2358         * To later detect whether a journal commit for sync writes is
2359         * necessary, we sample i_size, and cluster count here.
2360         */
2361        old_size = i_size_read(inode);
2362        old_clusters = OCFS2_I(inode)->ip_clusters;
2363
2364        /* communicate with ocfs2_dio_end_io */
2365        ocfs2_iocb_set_rw_locked(iocb, rw_level);
2366
2367        ret = generic_segment_checks(iov, &nr_segs, &ocount,
2368                                     VERIFY_READ);
2369        if (ret)
2370                goto out_dio;
2371
2372        count = ocount;
2373        ret = generic_write_checks(file, ppos, &count,
2374                                   S_ISBLK(inode->i_mode));
2375        if (ret)
2376                goto out_dio;
2377
2378        if (direct_io) {
2379                written = generic_file_direct_write(iocb, iov, &nr_segs, *ppos,
2380                                                    ppos, count, ocount);
2381                if (written < 0) {
2382                        ret = written;
2383                        goto out_dio;
2384                }
2385        } else {
2386                current->backing_dev_info = file->f_mapping->backing_dev_info;
2387                written = generic_file_buffered_write(iocb, iov, nr_segs, *ppos,
2388                                                      ppos, count, 0);
2389                current->backing_dev_info = NULL;
2390        }
2391
2392out_dio:
2393        /* buffered aio wouldn't have proper lock coverage today */
2394        BUG_ON(ret == -EIOCBQUEUED && !(file->f_flags & O_DIRECT));
2395
2396        if (((file->f_flags & O_DSYNC) && !direct_io) || IS_SYNC(inode) ||
2397            ((file->f_flags & O_DIRECT) && !direct_io)) {
2398                ret = filemap_fdatawrite_range(file->f_mapping, pos,
2399                                               pos + count - 1);
2400                if (ret < 0)
2401                        written = ret;
2402
2403                if (!ret && ((old_size != i_size_read(inode)) ||
2404                             (old_clusters != OCFS2_I(inode)->ip_clusters) ||
2405                             has_refcount)) {
2406                        ret = jbd2_journal_force_commit(osb->journal->j_journal);
2407                        if (ret < 0)
2408                                written = ret;
2409                }
2410
2411                if (!ret)
2412                        ret = filemap_fdatawait_range(file->f_mapping, pos,
2413                                                      pos + count - 1);
2414        }
2415
2416        /*
2417         * deep in g_f_a_w_n()->ocfs2_direct_IO we pass in a ocfs2_dio_end_io
2418         * function pointer which is called when o_direct io completes so that
2419         * it can unlock our rw lock.
2420         * Unfortunately there are error cases which call end_io and others
2421         * that don't.  so we don't have to unlock the rw_lock if either an
2422         * async dio is going to do it in the future or an end_io after an
2423         * error has already done it.
2424         */
2425        if ((ret == -EIOCBQUEUED) || (!ocfs2_iocb_is_rw_locked(iocb))) {
2426                rw_level = -1;
2427                have_alloc_sem = 0;
2428                unaligned_dio = 0;
2429        }
2430
2431        if (unaligned_dio) {
2432                ocfs2_iocb_clear_unaligned_aio(iocb);
2433                atomic_dec(&OCFS2_I(inode)->ip_unaligned_aio);
2434        }
2435
2436out:
2437        if (rw_level != -1)
2438                ocfs2_rw_unlock(inode, rw_level);
2439
2440out_sems:
2441        if (have_alloc_sem)
2442                ocfs2_iocb_clear_sem_locked(iocb);
2443
2444        mutex_unlock(&inode->i_mutex);
2445        sb_end_write(inode->i_sb);
2446
2447        if (written)
2448                ret = written;
2449        return ret;
2450}
2451
2452static int ocfs2_splice_to_file(struct pipe_inode_info *pipe,
2453                                struct file *out,
2454                                struct splice_desc *sd)
2455{
2456        int ret;
2457
2458        ret = ocfs2_prepare_inode_for_write(out, &sd->pos,
2459                                            sd->total_len, 0, NULL, NULL);
2460        if (ret < 0) {
2461                mlog_errno(ret);
2462                return ret;
2463        }
2464
2465        return splice_from_pipe_feed(pipe, sd, pipe_to_file);
2466}
2467
2468static ssize_t ocfs2_file_splice_write(struct pipe_inode_info *pipe,
2469                                       struct file *out,
2470                                       loff_t *ppos,
2471                                       size_t len,
2472                                       unsigned int flags)
2473{
2474        int ret;
2475        struct address_space *mapping = out->f_mapping;
2476        struct inode *inode = mapping->host;
2477        struct splice_desc sd = {
2478                .total_len = len,
2479                .flags = flags,
2480                .pos = *ppos,
2481                .u.file = out,
2482        };
2483
2484
2485        trace_ocfs2_file_splice_write(inode, out, out->f_path.dentry,
2486                        (unsigned long long)OCFS2_I(inode)->ip_blkno,
2487                        out->f_path.dentry->d_name.len,
2488                        out->f_path.dentry->d_name.name, len);
2489
2490        if (pipe->inode)
2491                mutex_lock_nested(&pipe->inode->i_mutex, I_MUTEX_PARENT);
2492
2493        splice_from_pipe_begin(&sd);
2494        do {
2495                ret = splice_from_pipe_next(pipe, &sd);
2496                if (ret <= 0)
2497                        break;
2498
2499                mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD);
2500                ret = ocfs2_rw_lock(inode, 1);
2501                if (ret < 0)
2502                        mlog_errno(ret);
2503                else {
2504                        ret = ocfs2_splice_to_file(pipe, out, &sd);
2505                        ocfs2_rw_unlock(inode, 1);
2506                }
2507                mutex_unlock(&inode->i_mutex);
2508        } while (ret > 0);
2509        splice_from_pipe_end(pipe, &sd);
2510
2511        if (pipe->inode)
2512                mutex_unlock(&pipe->inode->i_mutex);
2513
2514        if (sd.num_spliced)
2515                ret = sd.num_spliced;
2516
2517        if (ret > 0) {
2518                unsigned long nr_pages;
2519                int err;
2520
2521                nr_pages = (ret + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
2522
2523                err = generic_write_sync(out, *ppos, ret);
2524                if (err)
2525                        ret = err;
2526                else
2527                        *ppos += ret;
2528
2529                balance_dirty_pages_ratelimited_nr(mapping, nr_pages);
2530        }
2531
2532        return ret;
2533}
2534
2535static ssize_t ocfs2_file_splice_read(struct file *in,
2536                                      loff_t *ppos,
2537                                      struct pipe_inode_info *pipe,
2538                                      size_t len,
2539                                      unsigned int flags)
2540{
2541        int ret = 0, lock_level = 0;
2542        struct inode *inode = in->f_path.dentry->d_inode;
2543
2544        trace_ocfs2_file_splice_read(inode, in, in->f_path.dentry,
2545                        (unsigned long long)OCFS2_I(inode)->ip_blkno,
2546                        in->f_path.dentry->d_name.len,
2547                        in->f_path.dentry->d_name.name, len);
2548
2549        /*
2550         * See the comment in ocfs2_file_aio_read()
2551         */
2552        ret = ocfs2_inode_lock_atime(inode, in->f_vfsmnt, &lock_level);
2553        if (ret < 0) {
2554                mlog_errno(ret);
2555                goto bail;
2556        }
2557        ocfs2_inode_unlock(inode, lock_level);
2558
2559        ret = generic_file_splice_read(in, ppos, pipe, len, flags);
2560
2561bail:
2562        return ret;
2563}
2564
2565static ssize_t ocfs2_file_aio_read(struct kiocb *iocb,
2566                                   const struct iovec *iov,
2567                                   unsigned long nr_segs,
2568                                   loff_t pos)
2569{
2570        int ret = 0, rw_level = -1, have_alloc_sem = 0, lock_level = 0;
2571        struct file *filp = iocb->ki_filp;
2572        struct inode *inode = filp->f_path.dentry->d_inode;
2573
2574        trace_ocfs2_file_aio_read(inode, filp, filp->f_path.dentry,
2575                        (unsigned long long)OCFS2_I(inode)->ip_blkno,
2576                        filp->f_path.dentry->d_name.len,
2577                        filp->f_path.dentry->d_name.name, nr_segs);
2578
2579
2580        if (!inode) {
2581                ret = -EINVAL;
2582                mlog_errno(ret);
2583                goto bail;
2584        }
2585
2586        ocfs2_iocb_clear_sem_locked(iocb);
2587
2588        /*
2589         * buffered reads protect themselves in ->readpage().  O_DIRECT reads
2590         * need locks to protect pending reads from racing with truncate.
2591         */
2592        if (filp->f_flags & O_DIRECT) {
2593                have_alloc_sem = 1;
2594                ocfs2_iocb_set_sem_locked(iocb);
2595
2596                ret = ocfs2_rw_lock(inode, 0);
2597                if (ret < 0) {
2598                        mlog_errno(ret);
2599                        goto bail;
2600                }
2601                rw_level = 0;
2602                /* communicate with ocfs2_dio_end_io */
2603                ocfs2_iocb_set_rw_locked(iocb, rw_level);
2604        }
2605
2606        /*
2607         * We're fine letting folks race truncates and extending
2608         * writes with read across the cluster, just like they can
2609         * locally. Hence no rw_lock during read.
2610         *
2611         * Take and drop the meta data lock to update inode fields
2612         * like i_size. This allows the checks down below
2613         * generic_file_aio_read() a chance of actually working.
2614         */
2615        ret = ocfs2_inode_lock_atime(inode, filp->f_vfsmnt, &lock_level);
2616        if (ret < 0) {
2617                mlog_errno(ret);
2618                goto bail;
2619        }
2620        ocfs2_inode_unlock(inode, lock_level);
2621
2622        ret = generic_file_aio_read(iocb, iov, nr_segs, iocb->ki_pos);
2623        trace_generic_file_aio_read_ret(ret);
2624
2625        /* buffered aio wouldn't have proper lock coverage today */
2626        BUG_ON(ret == -EIOCBQUEUED && !(filp->f_flags & O_DIRECT));
2627
2628        /* see ocfs2_file_aio_write */
2629        if (ret == -EIOCBQUEUED || !ocfs2_iocb_is_rw_locked(iocb)) {
2630                rw_level = -1;
2631                have_alloc_sem = 0;
2632        }
2633
2634bail:
2635        if (have_alloc_sem)
2636                ocfs2_iocb_clear_sem_locked(iocb);
2637
2638        if (rw_level != -1)
2639                ocfs2_rw_unlock(inode, rw_level);
2640
2641        return ret;
2642}
2643
2644/* Refer generic_file_llseek_unlocked() */
2645static loff_t ocfs2_file_llseek(struct file *file, loff_t offset, int origin)
2646{
2647        struct inode *inode = file->f_mapping->host;
2648        int ret = 0;
2649
2650        mutex_lock(&inode->i_mutex);
2651
2652        switch (origin) {
2653        case SEEK_SET:
2654                break;
2655        case SEEK_END:
2656                offset += inode->i_size;
2657                break;
2658        case SEEK_CUR:
2659                if (offset == 0) {
2660                        offset = file->f_pos;
2661                        goto out;
2662                }
2663                offset += file->f_pos;
2664                break;
2665        case SEEK_DATA:
2666        case SEEK_HOLE:
2667                ret = ocfs2_seek_data_hole_offset(file, &offset, origin);
2668                if (ret)
2669                        goto out;
2670                break;
2671        default:
2672                ret = -EINVAL;
2673                goto out;
2674        }
2675
2676        if (offset < 0 && !(file->f_mode & FMODE_UNSIGNED_OFFSET))
2677                ret = -EINVAL;
2678        if (!ret && offset > inode->i_sb->s_maxbytes)
2679                ret = -EINVAL;
2680        if (ret)
2681                goto out;
2682
2683        if (offset != file->f_pos) {
2684                file->f_pos = offset;
2685                file->f_version = 0;
2686        }
2687
2688out:
2689        mutex_unlock(&inode->i_mutex);
2690        if (ret)
2691                return ret;
2692        return offset;
2693}
2694
2695const struct inode_operations ocfs2_file_iops = {
2696        .setattr        = ocfs2_setattr,
2697        .getattr        = ocfs2_getattr,
2698        .permission     = ocfs2_permission,
2699        .setxattr       = generic_setxattr,
2700        .getxattr       = generic_getxattr,
2701        .listxattr      = ocfs2_listxattr,
2702        .removexattr    = generic_removexattr,
2703        .fiemap         = ocfs2_fiemap,
2704        .get_acl        = ocfs2_iop_get_acl,
2705};
2706
2707const struct inode_operations ocfs2_special_file_iops = {
2708        .setattr        = ocfs2_setattr,
2709        .getattr        = ocfs2_getattr,
2710        .permission     = ocfs2_permission,
2711        .get_acl        = ocfs2_iop_get_acl,
2712};
2713
2714/*
2715 * Other than ->lock, keep ocfs2_fops and ocfs2_dops in sync with
2716 * ocfs2_fops_no_plocks and ocfs2_dops_no_plocks!
2717 */
2718const struct file_operations ocfs2_fops = {
2719        .llseek         = ocfs2_file_llseek,
2720        .read           = do_sync_read,
2721        .write          = do_sync_write,
2722        .mmap           = ocfs2_mmap,
2723        .fsync          = ocfs2_sync_file,
2724        .release        = ocfs2_file_release,
2725        .open           = ocfs2_file_open,
2726        .aio_read       = ocfs2_file_aio_read,
2727        .aio_write      = ocfs2_file_aio_write,
2728        .unlocked_ioctl = ocfs2_ioctl,
2729#ifdef CONFIG_COMPAT
2730        .compat_ioctl   = ocfs2_compat_ioctl,
2731#endif
2732        .lock           = ocfs2_lock,
2733        .flock          = ocfs2_flock,
2734        .splice_read    = ocfs2_file_splice_read,
2735        .splice_write   = ocfs2_file_splice_write,
2736        .fallocate      = ocfs2_fallocate,
2737};
2738
2739const struct file_operations ocfs2_dops = {
2740        .llseek         = generic_file_llseek,
2741        .read           = generic_read_dir,
2742        .readdir        = ocfs2_readdir,
2743        .fsync          = ocfs2_sync_file,
2744        .release        = ocfs2_dir_release,
2745        .open           = ocfs2_dir_open,
2746        .unlocked_ioctl = ocfs2_ioctl,
2747#ifdef CONFIG_COMPAT
2748        .compat_ioctl   = ocfs2_compat_ioctl,
2749#endif
2750        .lock           = ocfs2_lock,
2751        .flock          = ocfs2_flock,
2752};
2753
2754/*
2755 * POSIX-lockless variants of our file_operations.
2756 *
2757 * These will be used if the underlying cluster stack does not support
2758 * posix file locking, if the user passes the "localflocks" mount
2759 * option, or if we have a local-only fs.
2760 *
2761 * ocfs2_flock is in here because all stacks handle UNIX file locks,
2762 * so we still want it in the case of no stack support for
2763 * plocks. Internally, it will do the right thing when asked to ignore
2764 * the cluster.
2765 */
2766const struct file_operations ocfs2_fops_no_plocks = {
2767        .llseek         = ocfs2_file_llseek,
2768        .read           = do_sync_read,
2769        .write          = do_sync_write,
2770        .mmap           = ocfs2_mmap,
2771        .fsync          = ocfs2_sync_file,
2772        .release        = ocfs2_file_release,
2773        .open           = ocfs2_file_open,
2774        .aio_read       = ocfs2_file_aio_read,
2775        .aio_write      = ocfs2_file_aio_write,
2776        .unlocked_ioctl = ocfs2_ioctl,
2777#ifdef CONFIG_COMPAT
2778        .compat_ioctl   = ocfs2_compat_ioctl,
2779#endif
2780        .flock          = ocfs2_flock,
2781        .splice_read    = ocfs2_file_splice_read,
2782        .splice_write   = ocfs2_file_splice_write,
2783        .fallocate      = ocfs2_fallocate,
2784};
2785
2786const struct file_operations ocfs2_dops_no_plocks = {
2787        .llseek         = generic_file_llseek,
2788        .read           = generic_read_dir,
2789        .readdir        = ocfs2_readdir,
2790        .fsync          = ocfs2_sync_file,
2791        .release        = ocfs2_dir_release,
2792        .open           = ocfs2_dir_open,
2793        .unlocked_ioctl = ocfs2_ioctl,
2794#ifdef CONFIG_COMPAT
2795        .compat_ioctl   = ocfs2_compat_ioctl,
2796#endif
2797        .flock          = ocfs2_flock,
2798};
2799
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