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, 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, 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                            from_kuid(&init_user_ns, attr->ia_uid),
1120                            from_kgid(&init_user_ns, attr->ia_gid));
1121
1122        /* ensuring we don't even attempt to truncate a symlink */
1123        if (S_ISLNK(inode->i_mode))
1124                attr->ia_valid &= ~ATTR_SIZE;
1125
1126#define OCFS2_VALID_ATTRS (ATTR_ATIME | ATTR_MTIME | ATTR_CTIME | ATTR_SIZE \
1127                           | ATTR_GID | ATTR_UID | ATTR_MODE)
1128        if (!(attr->ia_valid & OCFS2_VALID_ATTRS))
1129                return 0;
1130
1131        status = inode_change_ok(inode, attr);
1132        if (status)
1133                return status;
1134
1135        if (is_quota_modification(inode, attr))
1136                dquot_initialize(inode);
1137        size_change = S_ISREG(inode->i_mode) && attr->ia_valid & ATTR_SIZE;
1138        if (size_change) {
1139                status = ocfs2_rw_lock(inode, 1);
1140                if (status < 0) {
1141                        mlog_errno(status);
1142                        goto bail;
1143                }
1144        }
1145
1146        status = ocfs2_inode_lock(inode, &bh, 1);
1147        if (status < 0) {
1148                if (status != -ENOENT)
1149                        mlog_errno(status);
1150                goto bail_unlock_rw;
1151        }
1152
1153        if (size_change && attr->ia_size != i_size_read(inode)) {
1154                status = inode_newsize_ok(inode, attr->ia_size);
1155                if (status)
1156                        goto bail_unlock;
1157
1158                inode_dio_wait(inode);
1159
1160                if (i_size_read(inode) > attr->ia_size) {
1161                        if (ocfs2_should_order_data(inode)) {
1162                                status = ocfs2_begin_ordered_truncate(inode,
1163                                                                      attr->ia_size);
1164                                if (status)
1165                                        goto bail_unlock;
1166                        }
1167                        status = ocfs2_truncate_file(inode, bh, attr->ia_size);
1168                } else
1169                        status = ocfs2_extend_file(inode, bh, attr->ia_size);
1170                if (status < 0) {
1171                        if (status != -ENOSPC)
1172                                mlog_errno(status);
1173                        status = -ENOSPC;
1174                        goto bail_unlock;
1175                }
1176        }
1177
1178        if ((attr->ia_valid & ATTR_UID && !uid_eq(attr->ia_uid, inode->i_uid)) ||
1179            (attr->ia_valid & ATTR_GID && !gid_eq(attr->ia_gid, inode->i_gid))) {
1180                /*
1181                 * Gather pointers to quota structures so that allocation /
1182                 * freeing of quota structures happens here and not inside
1183                 * dquot_transfer() where we have problems with lock ordering
1184                 */
1185                if (attr->ia_valid & ATTR_UID && !uid_eq(attr->ia_uid, inode->i_uid)
1186                    && OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1187                    OCFS2_FEATURE_RO_COMPAT_USRQUOTA)) {
1188                        transfer_to[USRQUOTA] = dqget(sb, make_kqid_uid(attr->ia_uid));
1189                        if (!transfer_to[USRQUOTA]) {
1190                                status = -ESRCH;
1191                                goto bail_unlock;
1192                        }
1193                }
1194                if (attr->ia_valid & ATTR_GID && !gid_eq(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, make_kqid_gid(attr->ia_gid));
1198                        if (!transfer_to[GRPQUOTA]) {
1199                                status = -ESRCH;
1200                                goto bail_unlock;
1201                        }
1202                }
1203                handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS +
1204                                           2 * ocfs2_quota_trans_credits(sb));
1205                if (IS_ERR(handle)) {
1206                        status = PTR_ERR(handle);
1207                        mlog_errno(status);
1208                        goto bail_unlock;
1209                }
1210                status = __dquot_transfer(inode, transfer_to);
1211                if (status < 0)
1212                        goto bail_commit;
1213        } else {
1214                handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1215                if (IS_ERR(handle)) {
1216                        status = PTR_ERR(handle);
1217                        mlog_errno(status);
1218                        goto bail_unlock;
1219                }
1220        }
1221
1222        setattr_copy(inode, attr);
1223        mark_inode_dirty(inode);
1224
1225        status = ocfs2_mark_inode_dirty(handle, inode, bh);
1226        if (status < 0)
1227                mlog_errno(status);
1228
1229bail_commit:
1230        ocfs2_commit_trans(osb, handle);
1231bail_unlock:
1232        ocfs2_inode_unlock(inode, 1);
1233bail_unlock_rw:
1234        if (size_change)
1235                ocfs2_rw_unlock(inode, 1);
1236bail:
1237        brelse(bh);
1238
1239        /* Release quota pointers in case we acquired them */
1240        for (qtype = 0; qtype < MAXQUOTAS; qtype++)
1241                dqput(transfer_to[qtype]);
1242
1243        if (!status && attr->ia_valid & ATTR_MODE) {
1244                status = ocfs2_acl_chmod(inode);
1245                if (status < 0)
1246                        mlog_errno(status);
1247        }
1248
1249        return status;
1250}
1251
1252int ocfs2_getattr(struct vfsmount *mnt,
1253                  struct dentry *dentry,
1254                  struct kstat *stat)
1255{
1256        struct inode *inode = dentry->d_inode;
1257        struct super_block *sb = dentry->d_inode->i_sb;
1258        struct ocfs2_super *osb = sb->s_fs_info;
1259        int err;
1260
1261        err = ocfs2_inode_revalidate(dentry);
1262        if (err) {
1263                if (err != -ENOENT)
1264                        mlog_errno(err);
1265                goto bail;
1266        }
1267
1268        generic_fillattr(inode, stat);
1269
1270        /* We set the blksize from the cluster size for performance */
1271        stat->blksize = osb->s_clustersize;
1272
1273bail:
1274        return err;
1275}
1276
1277int ocfs2_permission(struct inode *inode, int mask)
1278{
1279        int ret;
1280
1281        if (mask & MAY_NOT_BLOCK)
1282                return -ECHILD;
1283
1284        ret = ocfs2_inode_lock(inode, NULL, 0);
1285        if (ret) {
1286                if (ret != -ENOENT)
1287                        mlog_errno(ret);
1288                goto out;
1289        }
1290
1291        ret = generic_permission(inode, mask);
1292
1293        ocfs2_inode_unlock(inode, 0);
1294out:
1295        return ret;
1296}
1297
1298static int __ocfs2_write_remove_suid(struct inode *inode,
1299                                     struct buffer_head *bh)
1300{
1301        int ret;
1302        handle_t *handle;
1303        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1304        struct ocfs2_dinode *di;
1305
1306        trace_ocfs2_write_remove_suid(
1307                        (unsigned long long)OCFS2_I(inode)->ip_blkno,
1308                        inode->i_mode);
1309
1310        handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1311        if (IS_ERR(handle)) {
1312                ret = PTR_ERR(handle);
1313                mlog_errno(ret);
1314                goto out;
1315        }
1316
1317        ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), bh,
1318                                      OCFS2_JOURNAL_ACCESS_WRITE);
1319        if (ret < 0) {
1320                mlog_errno(ret);
1321                goto out_trans;
1322        }
1323
1324        inode->i_mode &= ~S_ISUID;
1325        if ((inode->i_mode & S_ISGID) && (inode->i_mode & S_IXGRP))
1326                inode->i_mode &= ~S_ISGID;
1327
1328        di = (struct ocfs2_dinode *) bh->b_data;
1329        di->i_mode = cpu_to_le16(inode->i_mode);
1330
1331        ocfs2_journal_dirty(handle, bh);
1332
1333out_trans:
1334        ocfs2_commit_trans(osb, handle);
1335out:
1336        return ret;
1337}
1338
1339/*
1340 * Will look for holes and unwritten extents in the range starting at
1341 * pos for count bytes (inclusive).
1342 */
1343static int ocfs2_check_range_for_holes(struct inode *inode, loff_t pos,
1344                                       size_t count)
1345{
1346        int ret = 0;
1347        unsigned int extent_flags;
1348        u32 cpos, clusters, extent_len, phys_cpos;
1349        struct super_block *sb = inode->i_sb;
1350
1351        cpos = pos >> OCFS2_SB(sb)->s_clustersize_bits;
1352        clusters = ocfs2_clusters_for_bytes(sb, pos + count) - cpos;
1353
1354        while (clusters) {
1355                ret = ocfs2_get_clusters(inode, cpos, &phys_cpos, &extent_len,
1356                                         &extent_flags);
1357                if (ret < 0) {
1358                        mlog_errno(ret);
1359                        goto out;
1360                }
1361
1362                if (phys_cpos == 0 || (extent_flags & OCFS2_EXT_UNWRITTEN)) {
1363                        ret = 1;
1364                        break;
1365                }
1366
1367                if (extent_len > clusters)
1368                        extent_len = clusters;
1369
1370                clusters -= extent_len;
1371                cpos += extent_len;
1372        }
1373out:
1374        return ret;
1375}
1376
1377static int ocfs2_write_remove_suid(struct inode *inode)
1378{
1379        int ret;
1380        struct buffer_head *bh = NULL;
1381
1382        ret = ocfs2_read_inode_block(inode, &bh);
1383        if (ret < 0) {
1384                mlog_errno(ret);
1385                goto out;
1386        }
1387
1388        ret =  __ocfs2_write_remove_suid(inode, bh);
1389out:
1390        brelse(bh);
1391        return ret;
1392}
1393
1394/*
1395 * Allocate enough extents to cover the region starting at byte offset
1396 * start for len bytes. Existing extents are skipped, any extents
1397 * added are marked as "unwritten".
1398 */
1399static int ocfs2_allocate_unwritten_extents(struct inode *inode,
1400                                            u64 start, u64 len)
1401{
1402        int ret;
1403        u32 cpos, phys_cpos, clusters, alloc_size;
1404        u64 end = start + len;
1405        struct buffer_head *di_bh = NULL;
1406
1407        if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1408                ret = ocfs2_read_inode_block(inode, &di_bh);
1409                if (ret) {
1410                        mlog_errno(ret);
1411                        goto out;
1412                }
1413
1414                /*
1415                 * Nothing to do if the requested reservation range
1416                 * fits within the inode.
1417                 */
1418                if (ocfs2_size_fits_inline_data(di_bh, end))
1419                        goto out;
1420
1421                ret = ocfs2_convert_inline_data_to_extents(inode, di_bh);
1422                if (ret) {
1423                        mlog_errno(ret);
1424                        goto out;
1425                }
1426        }
1427
1428        /*
1429         * We consider both start and len to be inclusive.
1430         */
1431        cpos = start >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
1432        clusters = ocfs2_clusters_for_bytes(inode->i_sb, start + len);
1433        clusters -= cpos;
1434
1435        while (clusters) {
1436                ret = ocfs2_get_clusters(inode, cpos, &phys_cpos,
1437                                         &alloc_size, NULL);
1438                if (ret) {
1439                        mlog_errno(ret);
1440                        goto out;
1441                }
1442
1443                /*
1444                 * Hole or existing extent len can be arbitrary, so
1445                 * cap it to our own allocation request.
1446                 */
1447                if (alloc_size > clusters)
1448                        alloc_size = clusters;
1449
1450                if (phys_cpos) {
1451                        /*
1452                         * We already have an allocation at this
1453                         * region so we can safely skip it.
1454                         */
1455                        goto next;
1456                }
1457
1458                ret = __ocfs2_extend_allocation(inode, cpos, alloc_size, 1);
1459                if (ret) {
1460                        if (ret != -ENOSPC)
1461                                mlog_errno(ret);
1462                        goto out;
1463                }
1464
1465next:
1466                cpos += alloc_size;
1467                clusters -= alloc_size;
1468        }
1469
1470        ret = 0;
1471out:
1472
1473        brelse(di_bh);
1474        return ret;
1475}
1476
1477/*
1478 * Truncate a byte range, avoiding pages within partial clusters. This
1479 * preserves those pages for the zeroing code to write to.
1480 */
1481static void ocfs2_truncate_cluster_pages(struct inode *inode, u64 byte_start,
1482                                         u64 byte_len)
1483{
1484        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1485        loff_t start, end;
1486        struct address_space *mapping = inode->i_mapping;
1487
1488        start = (loff_t)ocfs2_align_bytes_to_clusters(inode->i_sb, byte_start);
1489        end = byte_start + byte_len;
1490        end = end & ~(osb->s_clustersize - 1);
1491
1492        if (start < end) {
1493                unmap_mapping_range(mapping, start, end - start, 0);
1494                truncate_inode_pages_range(mapping, start, end - 1);
1495        }
1496}
1497
1498static int ocfs2_zero_partial_clusters(struct inode *inode,
1499                                       u64 start, u64 len)
1500{
1501        int ret = 0;
1502        u64 tmpend, end = start + len;
1503        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1504        unsigned int csize = osb->s_clustersize;
1505        handle_t *handle;
1506
1507        /*
1508         * The "start" and "end" values are NOT necessarily part of
1509         * the range whose allocation is being deleted. Rather, this
1510         * is what the user passed in with the request. We must zero
1511         * partial clusters here. There's no need to worry about
1512         * physical allocation - the zeroing code knows to skip holes.
1513         */
1514        trace_ocfs2_zero_partial_clusters(
1515                (unsigned long long)OCFS2_I(inode)->ip_blkno,
1516                (unsigned long long)start, (unsigned long long)end);
1517
1518        /*
1519         * If both edges are on a cluster boundary then there's no
1520         * zeroing required as the region is part of the allocation to
1521         * be truncated.
1522         */
1523        if ((start & (csize - 1)) == 0 && (end & (csize - 1)) == 0)
1524                goto out;
1525
1526        handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1527        if (IS_ERR(handle)) {
1528                ret = PTR_ERR(handle);
1529                mlog_errno(ret);
1530                goto out;
1531        }
1532
1533        /*
1534         * We want to get the byte offset of the end of the 1st cluster.
1535         */
1536        tmpend = (u64)osb->s_clustersize + (start & ~(osb->s_clustersize - 1));
1537        if (tmpend > end)
1538                tmpend = end;
1539
1540        trace_ocfs2_zero_partial_clusters_range1((unsigned long long)start,
1541                                                 (unsigned long long)tmpend);
1542
1543        ret = ocfs2_zero_range_for_truncate(inode, handle, start, tmpend);
1544        if (ret)
1545                mlog_errno(ret);
1546
1547        if (tmpend < end) {
1548                /*
1549                 * This may make start and end equal, but the zeroing
1550                 * code will skip any work in that case so there's no
1551                 * need to catch it up here.
1552                 */
1553                start = end & ~(osb->s_clustersize - 1);
1554
1555                trace_ocfs2_zero_partial_clusters_range2(
1556                        (unsigned long long)start, (unsigned long long)end);
1557
1558                ret = ocfs2_zero_range_for_truncate(inode, handle, start, end);
1559                if (ret)
1560                        mlog_errno(ret);
1561        }
1562
1563        ocfs2_commit_trans(osb, handle);
1564out:
1565        return ret;
1566}
1567
1568static int ocfs2_find_rec(struct ocfs2_extent_list *el, u32 pos)
1569{
1570        int i;
1571        struct ocfs2_extent_rec *rec = NULL;
1572
1573        for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) {
1574
1575                rec = &el->l_recs[i];
1576
1577                if (le32_to_cpu(rec->e_cpos) < pos)
1578                        break;
1579        }
1580
1581        return i;
1582}
1583
1584/*
1585 * Helper to calculate the punching pos and length in one run, we handle the
1586 * following three cases in order:
1587 *
1588 * - remove the entire record
1589 * - remove a partial record
1590 * - no record needs to be removed (hole-punching completed)
1591*/
1592static void ocfs2_calc_trunc_pos(struct inode *inode,
1593                                 struct ocfs2_extent_list *el,
1594                                 struct ocfs2_extent_rec *rec,
1595                                 u32 trunc_start, u32 *trunc_cpos,
1596                                 u32 *trunc_len, u32 *trunc_end,
1597                                 u64 *blkno, int *done)
1598{
1599        int ret = 0;
1600        u32 coff, range;
1601
1602        range = le32_to_cpu(rec->e_cpos) + ocfs2_rec_clusters(el, rec);
1603
1604        if (le32_to_cpu(rec->e_cpos) >= trunc_start) {
1605                /*
1606                 * remove an entire extent record.
1607                 */
1608                *trunc_cpos = le32_to_cpu(rec->e_cpos);
1609                /*
1610                 * Skip holes if any.
1611                 */
1612                if (range < *trunc_end)
1613                        *trunc_end = range;
1614                *trunc_len = *trunc_end - le32_to_cpu(rec->e_cpos);
1615                *blkno = le64_to_cpu(rec->e_blkno);
1616                *trunc_end = le32_to_cpu(rec->e_cpos);
1617        } else if (range > trunc_start) {
1618                /*
1619                 * remove a partial extent record, which means we're
1620                 * removing the last extent record.
1621                 */
1622                *trunc_cpos = trunc_start;
1623                /*
1624                 * skip hole if any.
1625                 */
1626                if (range < *trunc_end)
1627                        *trunc_end = range;
1628                *trunc_len = *trunc_end - trunc_start;
1629                coff = trunc_start - le32_to_cpu(rec->e_cpos);
1630                *blkno = le64_to_cpu(rec->e_blkno) +
1631                                ocfs2_clusters_to_blocks(inode->i_sb, coff);
1632                *trunc_end = trunc_start;
1633        } else {
1634                /*
1635                 * It may have two following possibilities:
1636                 *
1637                 * - last record has been removed
1638                 * - trunc_start was within a hole
1639                 *
1640                 * both two cases mean the completion of hole punching.
1641                 */
1642                ret = 1;
1643        }
1644
1645        *done = ret;
1646}
1647
1648static int ocfs2_remove_inode_range(struct inode *inode,
1649                                    struct buffer_head *di_bh, u64 byte_start,
1650                                    u64 byte_len)
1651{
1652        int ret = 0, flags = 0, done = 0, i;
1653        u32 trunc_start, trunc_len, trunc_end, trunc_cpos, phys_cpos;
1654        u32 cluster_in_el;
1655        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1656        struct ocfs2_cached_dealloc_ctxt dealloc;
1657        struct address_space *mapping = inode->i_mapping;
1658        struct ocfs2_extent_tree et;
1659        struct ocfs2_path *path = NULL;
1660        struct ocfs2_extent_list *el = NULL;
1661        struct ocfs2_extent_rec *rec = NULL;
1662        struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
1663        u64 blkno, refcount_loc = le64_to_cpu(di->i_refcount_loc);
1664
1665        ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), di_bh);
1666        ocfs2_init_dealloc_ctxt(&dealloc);
1667
1668        trace_ocfs2_remove_inode_range(
1669                        (unsigned long long)OCFS2_I(inode)->ip_blkno,
1670                        (unsigned long long)byte_start,
1671                        (unsigned long long)byte_len);
1672
1673        if (byte_len == 0)
1674                return 0;
1675
1676        if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1677                ret = ocfs2_truncate_inline(inode, di_bh, byte_start,
1678                                            byte_start + byte_len, 0);
1679                if (ret) {
1680                        mlog_errno(ret);
1681                        goto out;
1682                }
1683                /*
1684                 * There's no need to get fancy with the page cache
1685                 * truncate of an inline-data inode. We're talking
1686                 * about less than a page here, which will be cached
1687                 * in the dinode buffer anyway.
1688                 */
1689                unmap_mapping_range(mapping, 0, 0, 0);
1690                truncate_inode_pages(mapping, 0);
1691                goto out;
1692        }
1693
1694        /*
1695         * For reflinks, we may need to CoW 2 clusters which might be
1696         * partially zero'd later, if hole's start and end offset were
1697         * within one cluster(means is not exactly aligned to clustersize).
1698         */
1699
1700        if (OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL) {
1701
1702                ret = ocfs2_cow_file_pos(inode, di_bh, byte_start);
1703                if (ret) {
1704                        mlog_errno(ret);
1705                        goto out;
1706                }
1707
1708                ret = ocfs2_cow_file_pos(inode, di_bh, byte_start + byte_len);
1709                if (ret) {
1710                        mlog_errno(ret);
1711                        goto out;
1712                }
1713        }
1714
1715        trunc_start = ocfs2_clusters_for_bytes(osb->sb, byte_start);
1716        trunc_end = (byte_start + byte_len) >> osb->s_clustersize_bits;
1717        cluster_in_el = trunc_end;
1718
1719        ret = ocfs2_zero_partial_clusters(inode, byte_start, byte_len);
1720        if (ret) {
1721                mlog_errno(ret);
1722                goto out;
1723        }
1724
1725        path = ocfs2_new_path_from_et(&et);
1726        if (!path) {
1727                ret = -ENOMEM;
1728                mlog_errno(ret);
1729                goto out;
1730        }
1731
1732        while (trunc_end > trunc_start) {
1733
1734                ret = ocfs2_find_path(INODE_CACHE(inode), path,
1735                                      cluster_in_el);
1736                if (ret) {
1737                        mlog_errno(ret);
1738                        goto out;
1739                }
1740
1741                el = path_leaf_el(path);
1742
1743                i = ocfs2_find_rec(el, trunc_end);
1744                /*
1745                 * Need to go to previous extent block.
1746                 */
1747                if (i < 0) {
1748                        if (path->p_tree_depth == 0)
1749                                break;
1750
1751                        ret = ocfs2_find_cpos_for_left_leaf(inode->i_sb,
1752                                                            path,
1753                                                            &cluster_in_el);
1754                        if (ret) {
1755                                mlog_errno(ret);
1756                                goto out;
1757                        }
1758
1759                        /*
1760                         * We've reached the leftmost extent block,
1761                         * it's safe to leave.
1762                         */
1763                        if (cluster_in_el == 0)
1764                                break;
1765
1766                        /*
1767                         * The 'pos' searched for previous extent block is
1768                         * always one cluster less than actual trunc_end.
1769                         */
1770                        trunc_end = cluster_in_el + 1;
1771
1772                        ocfs2_reinit_path(path, 1);
1773
1774                        continue;
1775
1776                } else
1777                        rec = &el->l_recs[i];
1778
1779                ocfs2_calc_trunc_pos(inode, el, rec, trunc_start, &trunc_cpos,
1780                                     &trunc_len, &trunc_end, &blkno, &done);
1781                if (done)
1782                        break;
1783
1784                flags = rec->e_flags;
1785                phys_cpos = ocfs2_blocks_to_clusters(inode->i_sb, blkno);
1786
1787                ret = ocfs2_remove_btree_range(inode, &et, trunc_cpos,
1788                                               phys_cpos, trunc_len, flags,
1789                                               &dealloc, refcount_loc);
1790                if (ret < 0) {
1791                        mlog_errno(ret);
1792                        goto out;
1793                }
1794
1795                cluster_in_el = trunc_end;
1796
1797                ocfs2_reinit_path(path, 1);
1798        }
1799
1800        ocfs2_truncate_cluster_pages(inode, byte_start, byte_len);
1801
1802out:
1803        ocfs2_schedule_truncate_log_flush(osb, 1);
1804        ocfs2_run_deallocs(osb, &dealloc);
1805
1806        return ret;
1807}
1808
1809/*
1810 * Parts of this function taken from xfs_change_file_space()
1811 */
1812static int __ocfs2_change_file_space(struct file *file, struct inode *inode,
1813                                     loff_t f_pos, unsigned int cmd,
1814                                     struct ocfs2_space_resv *sr,
1815                                     int change_size)
1816{
1817        int ret;
1818        s64 llen;
1819        loff_t size;
1820        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1821        struct buffer_head *di_bh = NULL;
1822        handle_t *handle;
1823        unsigned long long max_off = inode->i_sb->s_maxbytes;
1824
1825        if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
1826                return -EROFS;
1827
1828        mutex_lock(&inode->i_mutex);
1829
1830        /*
1831         * This prevents concurrent writes on other nodes
1832         */
1833        ret = ocfs2_rw_lock(inode, 1);
1834        if (ret) {
1835                mlog_errno(ret);
1836                goto out;
1837        }
1838
1839        ret = ocfs2_inode_lock(inode, &di_bh, 1);
1840        if (ret) {
1841                mlog_errno(ret);
1842                goto out_rw_unlock;
1843        }
1844
1845        if (inode->i_flags & (S_IMMUTABLE|S_APPEND)) {
1846                ret = -EPERM;
1847                goto out_inode_unlock;
1848        }
1849
1850        switch (sr->l_whence) {
1851        case 0: /*SEEK_SET*/
1852                break;
1853        case 1: /*SEEK_CUR*/
1854                sr->l_start += f_pos;
1855                break;
1856        case 2: /*SEEK_END*/
1857                sr->l_start += i_size_read(inode);
1858                break;
1859        default:
1860                ret = -EINVAL;
1861                goto out_inode_unlock;
1862        }
1863        sr->l_whence = 0;
1864
1865        llen = sr->l_len > 0 ? sr->l_len - 1 : sr->l_len;
1866
1867        if (sr->l_start < 0
1868            || sr->l_start > max_off
1869            || (sr->l_start + llen) < 0
1870            || (sr->l_start + llen) > max_off) {
1871                ret = -EINVAL;
1872                goto out_inode_unlock;
1873        }
1874        size = sr->l_start + sr->l_len;
1875
1876        if (cmd == OCFS2_IOC_RESVSP || cmd == OCFS2_IOC_RESVSP64) {
1877                if (sr->l_len <= 0) {
1878                        ret = -EINVAL;
1879                        goto out_inode_unlock;
1880                }
1881        }
1882
1883        if (file && should_remove_suid(file->f_path.dentry)) {
1884                ret = __ocfs2_write_remove_suid(inode, di_bh);
1885                if (ret) {
1886                        mlog_errno(ret);
1887                        goto out_inode_unlock;
1888                }
1889        }
1890
1891        down_write(&OCFS2_I(inode)->ip_alloc_sem);
1892        switch (cmd) {
1893        case OCFS2_IOC_RESVSP:
1894        case OCFS2_IOC_RESVSP64:
1895                /*
1896                 * This takes unsigned offsets, but the signed ones we
1897                 * pass have been checked against overflow above.
1898                 */
1899                ret = ocfs2_allocate_unwritten_extents(inode, sr->l_start,
1900                                                       sr->l_len);
1901                break;
1902        case OCFS2_IOC_UNRESVSP:
1903        case OCFS2_IOC_UNRESVSP64:
1904                ret = ocfs2_remove_inode_range(inode, di_bh, sr->l_start,
1905                                               sr->l_len);
1906                break;
1907        default:
1908                ret = -EINVAL;
1909        }
1910        up_write(&OCFS2_I(inode)->ip_alloc_sem);
1911        if (ret) {
1912                mlog_errno(ret);
1913                goto out_inode_unlock;
1914        }
1915
1916        /*
1917         * We update c/mtime for these changes
1918         */
1919        handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1920        if (IS_ERR(handle)) {
1921                ret = PTR_ERR(handle);
1922                mlog_errno(ret);
1923                goto out_inode_unlock;
1924        }
1925
1926        if (change_size && i_size_read(inode) < size)
1927                i_size_write(inode, size);
1928
1929        inode->i_ctime = inode->i_mtime = CURRENT_TIME;
1930        ret = ocfs2_mark_inode_dirty(handle, inode, di_bh);
1931        if (ret < 0)
1932                mlog_errno(ret);
1933
1934        if (file && (file->f_flags & O_SYNC))
1935                handle->h_sync = 1;
1936
1937        ocfs2_commit_trans(osb, handle);
1938
1939out_inode_unlock:
1940        brelse(di_bh);
1941        ocfs2_inode_unlock(inode, 1);
1942out_rw_unlock:
1943        ocfs2_rw_unlock(inode, 1);
1944
1945out:
1946        mutex_unlock(&inode->i_mutex);
1947        return ret;
1948}
1949
1950int ocfs2_change_file_space(struct file *file, unsigned int cmd,
1951                            struct ocfs2_space_resv *sr)
1952{
1953        struct inode *inode = file_inode(file);
1954        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1955        int ret;
1956
1957        if ((cmd == OCFS2_IOC_RESVSP || cmd == OCFS2_IOC_RESVSP64) &&
1958            !ocfs2_writes_unwritten_extents(osb))
1959                return -ENOTTY;
1960        else if ((cmd == OCFS2_IOC_UNRESVSP || cmd == OCFS2_IOC_UNRESVSP64) &&
1961                 !ocfs2_sparse_alloc(osb))
1962                return -ENOTTY;
1963
1964        if (!S_ISREG(inode->i_mode))
1965                return -EINVAL;
1966
1967        if (!(file->f_mode & FMODE_WRITE))
1968                return -EBADF;
1969
1970        ret = mnt_want_write_file(file);
1971        if (ret)
1972                return ret;
1973        ret = __ocfs2_change_file_space(file, inode, file->f_pos, cmd, sr, 0);
1974        mnt_drop_write_file(file);
1975        return ret;
1976}
1977
1978static long ocfs2_fallocate(struct file *file, int mode, loff_t offset,
1979                            loff_t len)
1980{
1981        struct inode *inode = file_inode(file);
1982        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1983        struct ocfs2_space_resv sr;
1984        int change_size = 1;
1985        int cmd = OCFS2_IOC_RESVSP64;
1986
1987        if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
1988                return -EOPNOTSUPP;
1989        if (!ocfs2_writes_unwritten_extents(osb))
1990                return -EOPNOTSUPP;
1991
1992        if (mode & FALLOC_FL_KEEP_SIZE)
1993                change_size = 0;
1994
1995        if (mode & FALLOC_FL_PUNCH_HOLE)
1996                cmd = OCFS2_IOC_UNRESVSP64;
1997
1998        sr.l_whence = 0;
1999        sr.l_start = (s64)offset;
2000        sr.l_len = (s64)len;
2001
2002        return __ocfs2_change_file_space(NULL, inode, offset, cmd, &sr,
2003                                         change_size);
2004}
2005
2006int ocfs2_check_range_for_refcount(struct inode *inode, loff_t pos,
2007                                   size_t count)
2008{
2009        int ret = 0;
2010        unsigned int extent_flags;
2011        u32 cpos, clusters, extent_len, phys_cpos;
2012        struct super_block *sb = inode->i_sb;
2013
2014        if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb)) ||
2015            !(OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL) ||
2016            OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
2017                return 0;
2018
2019        cpos = pos >> OCFS2_SB(sb)->s_clustersize_bits;
2020        clusters = ocfs2_clusters_for_bytes(sb, pos + count) - cpos;
2021
2022        while (clusters) {
2023                ret = ocfs2_get_clusters(inode, cpos, &phys_cpos, &extent_len,
2024                                         &extent_flags);
2025                if (ret < 0) {
2026                        mlog_errno(ret);
2027                        goto out;
2028                }
2029
2030                if (phys_cpos && (extent_flags & OCFS2_EXT_REFCOUNTED)) {
2031                        ret = 1;
2032                        break;
2033                }
2034
2035                if (extent_len > clusters)
2036                        extent_len = clusters;
2037
2038                clusters -= extent_len;
2039                cpos += extent_len;
2040        }
2041out:
2042        return ret;
2043}
2044
2045static void ocfs2_aiodio_wait(struct inode *inode)
2046{
2047        wait_queue_head_t *wq = ocfs2_ioend_wq(inode);
2048
2049        wait_event(*wq, (atomic_read(&OCFS2_I(inode)->ip_unaligned_aio) == 0));
2050}
2051
2052static int ocfs2_is_io_unaligned(struct inode *inode, size_t count, loff_t pos)
2053{
2054        int blockmask = inode->i_sb->s_blocksize - 1;
2055        loff_t final_size = pos + count;
2056
2057        if ((pos & blockmask) || (final_size & blockmask))
2058                return 1;
2059        return 0;
2060}
2061
2062static int ocfs2_prepare_inode_for_refcount(struct inode *inode,
2063                                            struct file *file,
2064                                            loff_t pos, size_t count,
2065                                            int *meta_level)
2066{
2067        int ret;
2068        struct buffer_head *di_bh = NULL;
2069        u32 cpos = pos >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
2070        u32 clusters =
2071                ocfs2_clusters_for_bytes(inode->i_sb, pos + count) - cpos;
2072
2073        ret = ocfs2_inode_lock(inode, &di_bh, 1);
2074        if (ret) {
2075                mlog_errno(ret);
2076                goto out;
2077        }
2078
2079        *meta_level = 1;
2080
2081        ret = ocfs2_refcount_cow(inode, di_bh, cpos, clusters, UINT_MAX);
2082        if (ret)
2083                mlog_errno(ret);
2084out:
2085        brelse(di_bh);
2086        return ret;
2087}
2088
2089static int ocfs2_prepare_inode_for_write(struct file *file,
2090                                         loff_t *ppos,
2091                                         size_t count,
2092                                         int appending,
2093                                         int *direct_io,
2094                                         int *has_refcount)
2095{
2096        int ret = 0, meta_level = 0;
2097        struct dentry *dentry = file->f_path.dentry;
2098        struct inode *inode = dentry->d_inode;
2099        loff_t saved_pos = 0, end;
2100
2101        /*
2102         * We start with a read level meta lock and only jump to an ex
2103         * if we need to make modifications here.
2104         */
2105        for(;;) {
2106                ret = ocfs2_inode_lock(inode, NULL, meta_level);
2107                if (ret < 0) {
2108                        meta_level = -1;
2109                        mlog_errno(ret);
2110                        goto out;
2111                }
2112
2113                /* Clear suid / sgid if necessary. We do this here
2114                 * instead of later in the write path because
2115                 * remove_suid() calls ->setattr without any hint that
2116                 * we may have already done our cluster locking. Since
2117                 * ocfs2_setattr() *must* take cluster locks to
2118                 * proceed, this will lead us to recursively lock the
2119                 * inode. There's also the dinode i_size state which
2120                 * can be lost via setattr during extending writes (we
2121                 * set inode->i_size at the end of a write. */
2122                if (should_remove_suid(dentry)) {
2123                        if (meta_level == 0) {
2124                                ocfs2_inode_unlock(inode, meta_level);
2125                                meta_level = 1;
2126                                continue;
2127                        }
2128
2129                        ret = ocfs2_write_remove_suid(inode);
2130                        if (ret < 0) {
2131                                mlog_errno(ret);
2132                                goto out_unlock;
2133                        }
2134                }
2135
2136                /* work on a copy of ppos until we're sure that we won't have
2137                 * to recalculate it due to relocking. */
2138                if (appending)
2139                        saved_pos = i_size_read(inode);
2140                else
2141                        saved_pos = *ppos;
2142
2143                end = saved_pos + count;
2144
2145                ret = ocfs2_check_range_for_refcount(inode, saved_pos, count);
2146                if (ret == 1) {
2147                        ocfs2_inode_unlock(inode, meta_level);
2148                        meta_level = -1;
2149
2150                        ret = ocfs2_prepare_inode_for_refcount(inode,
2151                                                               file,
2152                                                               saved_pos,
2153                                                               count,
2154                                                               &meta_level);
2155                        if (has_refcount)
2156                                *has_refcount = 1;
2157                        if (direct_io)
2158                                *direct_io = 0;
2159                }
2160
2161                if (ret < 0) {
2162                        mlog_errno(ret);
2163                        goto out_unlock;
2164                }
2165
2166                /*
2167                 * Skip the O_DIRECT checks if we don't need
2168                 * them.
2169                 */
2170                if (!direct_io || !(*direct_io))
2171                        break;
2172
2173                /*
2174                 * There's no sane way to do direct writes to an inode
2175                 * with inline data.
2176                 */
2177                if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
2178                        *direct_io = 0;
2179                        break;
2180                }
2181
2182                /*
2183                 * Allowing concurrent direct writes means
2184                 * i_size changes wouldn't be synchronized, so
2185                 * one node could wind up truncating another
2186                 * nodes writes.
2187                 */
2188                if (end > i_size_read(inode)) {
2189                        *direct_io = 0;
2190                        break;
2191                }
2192
2193                /*
2194                 * We don't fill holes during direct io, so
2195                 * check for them here. If any are found, the
2196                 * caller will have to retake some cluster
2197                 * locks and initiate the io as buffered.
2198                 */
2199                ret = ocfs2_check_range_for_holes(inode, saved_pos, count);
2200                if (ret == 1) {
2201                        *direct_io = 0;
2202                        ret = 0;
2203                } else if (ret < 0)
2204                        mlog_errno(ret);
2205                break;
2206        }
2207
2208        if (appending)
2209                *ppos = saved_pos;
2210
2211out_unlock:
2212        trace_ocfs2_prepare_inode_for_write(OCFS2_I(inode)->ip_blkno,
2213                                            saved_pos, appending, count,
2214                                            direct_io, has_refcount);
2215
2216        if (meta_level >= 0)
2217                ocfs2_inode_unlock(inode, meta_level);
2218
2219out:
2220        return ret;
2221}
2222
2223static ssize_t ocfs2_file_aio_write(struct kiocb *iocb,
2224                                    const struct iovec *iov,
2225                                    unsigned long nr_segs,
2226                                    loff_t pos)
2227{
2228        int ret, direct_io, appending, rw_level, have_alloc_sem  = 0;
2229        int can_do_direct, has_refcount = 0;
2230        ssize_t written = 0;
2231        size_t ocount;          /* original count */
2232        size_t count;           /* after file limit checks */
2233        loff_t old_size, *ppos = &iocb->ki_pos;
2234        u32 old_clusters;
2235        struct file *file = iocb->ki_filp;
2236        struct inode *inode = file_inode(file);
2237        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2238        int full_coherency = !(osb->s_mount_opt &
2239                               OCFS2_MOUNT_COHERENCY_BUFFERED);
2240        int unaligned_dio = 0;
2241
2242        trace_ocfs2_file_aio_write(inode, file, file->f_path.dentry,
2243                (unsigned long long)OCFS2_I(inode)->ip_blkno,
2244                file->f_path.dentry->d_name.len,
2245                file->f_path.dentry->d_name.name,
2246                (unsigned int)nr_segs);
2247
2248        if (iocb->ki_left == 0)
2249                return 0;
2250
2251        appending = file->f_flags & O_APPEND ? 1 : 0;
2252        direct_io = file->f_flags & O_DIRECT ? 1 : 0;
2253
2254        mutex_lock(&inode->i_mutex);
2255
2256        ocfs2_iocb_clear_sem_locked(iocb);
2257
2258relock:
2259        /* to match setattr's i_mutex -> rw_lock ordering */
2260        if (direct_io) {
2261                have_alloc_sem = 1;
2262                /* communicate with ocfs2_dio_end_io */
2263                ocfs2_iocb_set_sem_locked(iocb);
2264        }
2265
2266        /*
2267         * Concurrent O_DIRECT writes are allowed with
2268         * mount_option "coherency=buffered".
2269         */
2270        rw_level = (!direct_io || full_coherency);
2271
2272        ret = ocfs2_rw_lock(inode, rw_level);
2273        if (ret < 0) {
2274                mlog_errno(ret);
2275                goto out_sems;
2276        }
2277
2278        /*
2279         * O_DIRECT writes with "coherency=full" need to take EX cluster
2280         * inode_lock to guarantee coherency.
2281         */
2282        if (direct_io && full_coherency) {
2283                /*
2284                 * We need to take and drop the inode lock to force
2285                 * other nodes to drop their caches.  Buffered I/O
2286                 * already does this in write_begin().
2287                 */
2288                ret = ocfs2_inode_lock(inode, NULL, 1);
2289                if (ret < 0) {
2290                        mlog_errno(ret);
2291                        goto out;
2292                }
2293
2294                ocfs2_inode_unlock(inode, 1);
2295        }
2296
2297        can_do_direct = direct_io;
2298        ret = ocfs2_prepare_inode_for_write(file, ppos,
2299                                            iocb->ki_left, appending,
2300                                            &can_do_direct, &has_refcount);
2301        if (ret < 0) {
2302                mlog_errno(ret);
2303                goto out;
2304        }
2305
2306        if (direct_io && !is_sync_kiocb(iocb))
2307                unaligned_dio = ocfs2_is_io_unaligned(inode, iocb->ki_left,
2308                                                      *ppos);
2309
2310        /*
2311         * We can't complete the direct I/O as requested, fall back to
2312         * buffered I/O.
2313         */
2314        if (direct_io && !can_do_direct) {
2315                ocfs2_rw_unlock(inode, rw_level);
2316
2317                have_alloc_sem = 0;
2318                rw_level = -1;
2319
2320                direct_io = 0;
2321                goto relock;
2322        }
2323
2324        if (unaligned_dio) {
2325                /*
2326                 * Wait on previous unaligned aio to complete before
2327                 * proceeding.
2328                 */
2329                ocfs2_aiodio_wait(inode);
2330
2331                /* Mark the iocb as needing a decrement in ocfs2_dio_end_io */
2332                atomic_inc(&OCFS2_I(inode)->ip_unaligned_aio);
2333                ocfs2_iocb_set_unaligned_aio(iocb);
2334        }
2335
2336        /*
2337         * To later detect whether a journal commit for sync writes is
2338         * necessary, we sample i_size, and cluster count here.
2339         */
2340        old_size = i_size_read(inode);
2341        old_clusters = OCFS2_I(inode)->ip_clusters;
2342
2343        /* communicate with ocfs2_dio_end_io */
2344        ocfs2_iocb_set_rw_locked(iocb, rw_level);
2345
2346        ret = generic_segment_checks(iov, &nr_segs, &ocount,
2347                                     VERIFY_READ);
2348        if (ret)
2349                goto out_dio;
2350
2351        count = ocount;
2352        ret = generic_write_checks(file, ppos, &count,
2353                                   S_ISBLK(inode->i_mode));
2354        if (ret)
2355                goto out_dio;
2356
2357        if (direct_io) {
2358                written = generic_file_direct_write(iocb, iov, &nr_segs, *ppos,
2359                                                    ppos, count, ocount);
2360                if (written < 0) {
2361                        ret = written;
2362                        goto out_dio;
2363                }
2364        } else {
2365                current->backing_dev_info = file->f_mapping->backing_dev_info;
2366                written = generic_file_buffered_write(iocb, iov, nr_segs, *ppos,
2367                                                      ppos, count, 0);
2368                current->backing_dev_info = NULL;
2369        }
2370
2371out_dio:
2372        /* buffered aio wouldn't have proper lock coverage today */
2373        BUG_ON(ret == -EIOCBQUEUED && !(file->f_flags & O_DIRECT));
2374
2375        if (((file->f_flags & O_DSYNC) && !direct_io) || IS_SYNC(inode) ||
2376            ((file->f_flags & O_DIRECT) && !direct_io)) {
2377                ret = filemap_fdatawrite_range(file->f_mapping, pos,
2378                                               pos + count - 1);
2379                if (ret < 0)
2380                        written = ret;
2381
2382                if (!ret && ((old_size != i_size_read(inode)) ||
2383                             (old_clusters != OCFS2_I(inode)->ip_clusters) ||
2384                             has_refcount)) {
2385                        ret = jbd2_journal_force_commit(osb->journal->j_journal);
2386                        if (ret < 0)
2387                                written = ret;
2388                }
2389
2390                if (!ret)
2391                        ret = filemap_fdatawait_range(file->f_mapping, pos,
2392                                                      pos + count - 1);
2393        }
2394
2395        /*
2396         * deep in g_f_a_w_n()->ocfs2_direct_IO we pass in a ocfs2_dio_end_io
2397         * function pointer which is called when o_direct io completes so that
2398         * it can unlock our rw lock.
2399         * Unfortunately there are error cases which call end_io and others
2400         * that don't.  so we don't have to unlock the rw_lock if either an
2401         * async dio is going to do it in the future or an end_io after an
2402         * error has already done it.
2403         */
2404        if ((ret == -EIOCBQUEUED) || (!ocfs2_iocb_is_rw_locked(iocb))) {
2405                rw_level = -1;
2406                have_alloc_sem = 0;
2407                unaligned_dio = 0;
2408        }
2409
2410        if (unaligned_dio) {
2411                ocfs2_iocb_clear_unaligned_aio(iocb);
2412                atomic_dec(&OCFS2_I(inode)->ip_unaligned_aio);
2413        }
2414
2415out:
2416        if (rw_level != -1)
2417                ocfs2_rw_unlock(inode, rw_level);
2418
2419out_sems:
2420        if (have_alloc_sem)
2421                ocfs2_iocb_clear_sem_locked(iocb);
2422
2423        mutex_unlock(&inode->i_mutex);
2424
2425        if (written)
2426                ret = written;
2427        return ret;
2428}
2429
2430static int ocfs2_splice_to_file(struct pipe_inode_info *pipe,
2431                                struct file *out,
2432                                struct splice_desc *sd)
2433{
2434        int ret;
2435
2436        ret = ocfs2_prepare_inode_for_write(out, &sd->pos,
2437                                            sd->total_len, 0, NULL, NULL);
2438        if (ret < 0) {
2439                mlog_errno(ret);
2440                return ret;
2441        }
2442
2443        return splice_from_pipe_feed(pipe, sd, pipe_to_file);
2444}
2445
2446static ssize_t ocfs2_file_splice_write(struct pipe_inode_info *pipe,
2447                                       struct file *out,
2448                                       loff_t *ppos,
2449                                       size_t len,
2450                                       unsigned int flags)
2451{
2452        int ret;
2453        struct address_space *mapping = out->f_mapping;
2454        struct inode *inode = mapping->host;
2455        struct splice_desc sd = {
2456                .total_len = len,
2457                .flags = flags,
2458                .pos = *ppos,
2459                .u.file = out,
2460        };
2461
2462
2463        trace_ocfs2_file_splice_write(inode, out, out->f_path.dentry,
2464                        (unsigned long long)OCFS2_I(inode)->ip_blkno,
2465                        out->f_path.dentry->d_name.len,
2466                        out->f_path.dentry->d_name.name, len);
2467
2468        pipe_lock(pipe);
2469
2470        splice_from_pipe_begin(&sd);
2471        do {
2472                ret = splice_from_pipe_next(pipe, &sd);
2473                if (ret <= 0)
2474                        break;
2475
2476                mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD);
2477                ret = ocfs2_rw_lock(inode, 1);
2478                if (ret < 0)
2479                        mlog_errno(ret);
2480                else {
2481                        ret = ocfs2_splice_to_file(pipe, out, &sd);
2482                        ocfs2_rw_unlock(inode, 1);
2483                }
2484                mutex_unlock(&inode->i_mutex);
2485        } while (ret > 0);
2486        splice_from_pipe_end(pipe, &sd);
2487
2488        pipe_unlock(pipe);
2489
2490        if (sd.num_spliced)
2491                ret = sd.num_spliced;
2492
2493        if (ret > 0) {
2494                int err;
2495
2496                err = generic_write_sync(out, *ppos, ret);
2497                if (err)
2498                        ret = err;
2499                else
2500                        *ppos += ret;
2501
2502                balance_dirty_pages_ratelimited(mapping);
2503        }
2504
2505        return ret;
2506}
2507
2508static ssize_t ocfs2_file_splice_read(struct file *in,
2509                                      loff_t *ppos,
2510                                      struct pipe_inode_info *pipe,
2511                                      size_t len,
2512                                      unsigned int flags)
2513{
2514        int ret = 0, lock_level = 0;
2515        struct inode *inode = file_inode(in);
2516
2517        trace_ocfs2_file_splice_read(inode, in, in->f_path.dentry,
2518                        (unsigned long long)OCFS2_I(inode)->ip_blkno,
2519                        in->f_path.dentry->d_name.len,
2520                        in->f_path.dentry->d_name.name, len);
2521
2522        /*
2523         * See the comment in ocfs2_file_aio_read()
2524         */
2525        ret = ocfs2_inode_lock_atime(inode, in->f_path.mnt, &lock_level);
2526        if (ret < 0) {
2527                mlog_errno(ret);
2528                goto bail;
2529        }
2530        ocfs2_inode_unlock(inode, lock_level);
2531
2532        ret = generic_file_splice_read(in, ppos, pipe, len, flags);
2533
2534bail:
2535        return ret;
2536}
2537
2538static ssize_t ocfs2_file_aio_read(struct kiocb *iocb,
2539                                   const struct iovec *iov,
2540                                   unsigned long nr_segs,
2541                                   loff_t pos)
2542{
2543        int ret = 0, rw_level = -1, have_alloc_sem = 0, lock_level = 0;
2544        struct file *filp = iocb->ki_filp;
2545        struct inode *inode = file_inode(filp);
2546
2547        trace_ocfs2_file_aio_read(inode, filp, filp->f_path.dentry,
2548                        (unsigned long long)OCFS2_I(inode)->ip_blkno,
2549                        filp->f_path.dentry->d_name.len,
2550                        filp->f_path.dentry->d_name.name, nr_segs);
2551
2552
2553        if (!inode) {
2554                ret = -EINVAL;
2555                mlog_errno(ret);
2556                goto bail;
2557        }
2558
2559        ocfs2_iocb_clear_sem_locked(iocb);
2560
2561        /*
2562         * buffered reads protect themselves in ->readpage().  O_DIRECT reads
2563         * need locks to protect pending reads from racing with truncate.
2564         */
2565        if (filp->f_flags & O_DIRECT) {
2566                have_alloc_sem = 1;
2567                ocfs2_iocb_set_sem_locked(iocb);
2568
2569                ret = ocfs2_rw_lock(inode, 0);
2570                if (ret < 0) {
2571                        mlog_errno(ret);
2572                        goto bail;
2573                }
2574                rw_level = 0;
2575                /* communicate with ocfs2_dio_end_io */
2576                ocfs2_iocb_set_rw_locked(iocb, rw_level);
2577        }
2578
2579        /*
2580         * We're fine letting folks race truncates and extending
2581         * writes with read across the cluster, just like they can
2582         * locally. Hence no rw_lock during read.
2583         *
2584         * Take and drop the meta data lock to update inode fields
2585         * like i_size. This allows the checks down below
2586         * generic_file_aio_read() a chance of actually working.
2587         */
2588        ret = ocfs2_inode_lock_atime(inode, filp->f_path.mnt, &lock_level);
2589        if (ret < 0) {
2590                mlog_errno(ret);
2591                goto bail;
2592        }
2593        ocfs2_inode_unlock(inode, lock_level);
2594
2595        ret = generic_file_aio_read(iocb, iov, nr_segs, iocb->ki_pos);
2596        trace_generic_file_aio_read_ret(ret);
2597
2598        /* buffered aio wouldn't have proper lock coverage today */
2599        BUG_ON(ret == -EIOCBQUEUED && !(filp->f_flags & O_DIRECT));
2600
2601        /* see ocfs2_file_aio_write */
2602        if (ret == -EIOCBQUEUED || !ocfs2_iocb_is_rw_locked(iocb)) {
2603                rw_level = -1;
2604                have_alloc_sem = 0;
2605        }
2606
2607bail:
2608        if (have_alloc_sem)
2609                ocfs2_iocb_clear_sem_locked(iocb);
2610
2611        if (rw_level != -1)
2612                ocfs2_rw_unlock(inode, rw_level);
2613
2614        return ret;
2615}
2616
2617/* Refer generic_file_llseek_unlocked() */
2618static loff_t ocfs2_file_llseek(struct file *file, loff_t offset, int whence)
2619{
2620        struct inode *inode = file->f_mapping->host;
2621        int ret = 0;
2622
2623        mutex_lock(&inode->i_mutex);
2624
2625        switch (whence) {
2626        case SEEK_SET:
2627                break;
2628        case SEEK_END:
2629                offset += inode->i_size;
2630                break;
2631        case SEEK_CUR:
2632                if (offset == 0) {
2633                        offset = file->f_pos;
2634                        goto out;
2635                }
2636                offset += file->f_pos;
2637                break;
2638        case SEEK_DATA:
2639        case SEEK_HOLE:
2640                ret = ocfs2_seek_data_hole_offset(file, &offset, whence);
2641                if (ret)
2642                        goto out;
2643                break;
2644        default:
2645                ret = -EINVAL;
2646                goto out;
2647        }
2648
2649        offset = vfs_setpos(file, offset, inode->i_sb->s_maxbytes);
2650
2651out:
2652        mutex_unlock(&inode->i_mutex);
2653        if (ret)
2654                return ret;
2655        return offset;
2656}
2657
2658const struct inode_operations ocfs2_file_iops = {
2659        .setattr        = ocfs2_setattr,
2660        .getattr        = ocfs2_getattr,
2661        .permission     = ocfs2_permission,
2662        .setxattr       = generic_setxattr,
2663        .getxattr       = generic_getxattr,
2664        .listxattr      = ocfs2_listxattr,
2665        .removexattr    = generic_removexattr,
2666        .fiemap         = ocfs2_fiemap,
2667        .get_acl        = ocfs2_iop_get_acl,
2668};
2669
2670const struct inode_operations ocfs2_special_file_iops = {
2671        .setattr        = ocfs2_setattr,
2672        .getattr        = ocfs2_getattr,
2673        .permission     = ocfs2_permission,
2674        .get_acl        = ocfs2_iop_get_acl,
2675};
2676
2677/*
2678 * Other than ->lock, keep ocfs2_fops and ocfs2_dops in sync with
2679 * ocfs2_fops_no_plocks and ocfs2_dops_no_plocks!
2680 */
2681const struct file_operations ocfs2_fops = {
2682        .llseek         = ocfs2_file_llseek,
2683        .read           = do_sync_read,
2684        .write          = do_sync_write,
2685        .mmap           = ocfs2_mmap,
2686        .fsync          = ocfs2_sync_file,
2687        .release        = ocfs2_file_release,
2688        .open           = ocfs2_file_open,
2689        .aio_read       = ocfs2_file_aio_read,
2690        .aio_write      = ocfs2_file_aio_write,
2691        .unlocked_ioctl = ocfs2_ioctl,
2692#ifdef CONFIG_COMPAT
2693        .compat_ioctl   = ocfs2_compat_ioctl,
2694#endif
2695        .lock           = ocfs2_lock,
2696        .flock          = ocfs2_flock,
2697        .splice_read    = ocfs2_file_splice_read,
2698        .splice_write   = ocfs2_file_splice_write,
2699        .fallocate      = ocfs2_fallocate,
2700};
2701
2702const struct file_operations ocfs2_dops = {
2703        .llseek         = generic_file_llseek,
2704        .read           = generic_read_dir,
2705        .iterate        = ocfs2_readdir,
2706        .fsync          = ocfs2_sync_file,
2707        .release        = ocfs2_dir_release,
2708        .open           = ocfs2_dir_open,
2709        .unlocked_ioctl = ocfs2_ioctl,
2710#ifdef CONFIG_COMPAT
2711        .compat_ioctl   = ocfs2_compat_ioctl,
2712#endif
2713        .lock           = ocfs2_lock,
2714        .flock          = ocfs2_flock,
2715};
2716
2717/*
2718 * POSIX-lockless variants of our file_operations.
2719 *
2720 * These will be used if the underlying cluster stack does not support
2721 * posix file locking, if the user passes the "localflocks" mount
2722 * option, or if we have a local-only fs.
2723 *
2724 * ocfs2_flock is in here because all stacks handle UNIX file locks,
2725 * so we still want it in the case of no stack support for
2726 * plocks. Internally, it will do the right thing when asked to ignore
2727 * the cluster.
2728 */
2729const struct file_operations ocfs2_fops_no_plocks = {
2730        .llseek         = ocfs2_file_llseek,
2731        .read           = do_sync_read,
2732        .write          = do_sync_write,
2733        .mmap           = ocfs2_mmap,
2734        .fsync          = ocfs2_sync_file,
2735        .release        = ocfs2_file_release,
2736        .open           = ocfs2_file_open,
2737        .aio_read       = ocfs2_file_aio_read,
2738        .aio_write      = ocfs2_file_aio_write,
2739        .unlocked_ioctl = ocfs2_ioctl,
2740#ifdef CONFIG_COMPAT
2741        .compat_ioctl   = ocfs2_compat_ioctl,
2742#endif
2743        .flock          = ocfs2_flock,
2744        .splice_read    = ocfs2_file_splice_read,
2745        .splice_write   = ocfs2_file_splice_write,
2746        .fallocate      = ocfs2_fallocate,
2747};
2748
2749const struct file_operations ocfs2_dops_no_plocks = {
2750        .llseek         = generic_file_llseek,
2751        .read           = generic_read_dir,
2752        .iterate        = ocfs2_readdir,
2753        .fsync          = ocfs2_sync_file,
2754        .release        = ocfs2_dir_release,
2755        .open           = ocfs2_dir_open,
2756        .unlocked_ioctl = ocfs2_ioctl,
2757#ifdef CONFIG_COMPAT
2758        .compat_ioctl   = ocfs2_compat_ioctl,
2759#endif
2760        .flock          = ocfs2_flock,
2761};
2762
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