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#include <linux/backing-dev.h>
  41
  42#include <cluster/masklog.h>
  43
  44#include "ocfs2.h"
  45
  46#include "alloc.h"
  47#include "aops.h"
  48#include "dir.h"
  49#include "dlmglue.h"
  50#include "extent_map.h"
  51#include "file.h"
  52#include "sysfile.h"
  53#include "inode.h"
  54#include "ioctl.h"
  55#include "journal.h"
  56#include "locks.h"
  57#include "mmap.h"
  58#include "suballoc.h"
  59#include "super.h"
  60#include "xattr.h"
  61#include "acl.h"
  62#include "quota.h"
  63#include "refcounttree.h"
  64#include "ocfs2_trace.h"
  65
  66#include "buffer_head_io.h"
  67
  68static int ocfs2_init_file_private(struct inode *inode, struct file *file)
  69{
  70	struct ocfs2_file_private *fp;
  71
  72	fp = kzalloc(sizeof(struct ocfs2_file_private), GFP_KERNEL);
  73	if (!fp)
  74		return -ENOMEM;
  75
  76	fp->fp_file = file;
  77	mutex_init(&fp->fp_mutex);
  78	ocfs2_file_lock_res_init(&fp->fp_flock, fp);
  79	file->private_data = fp;
  80
  81	return 0;
  82}
  83
  84static void ocfs2_free_file_private(struct inode *inode, struct file *file)
  85{
  86	struct ocfs2_file_private *fp = file->private_data;
  87	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
  88
  89	if (fp) {
  90		ocfs2_simple_drop_lockres(osb, &fp->fp_flock);
  91		ocfs2_lock_res_free(&fp->fp_flock);
  92		kfree(fp);
  93		file->private_data = NULL;
  94	}
  95}
  96
  97static int ocfs2_file_open(struct inode *inode, struct file *file)
  98{
  99	int status;
 100	int mode = file->f_flags;
 101	struct ocfs2_inode_info *oi = OCFS2_I(inode);
 102
 103	trace_ocfs2_file_open(inode, file, file->f_path.dentry,
 104			      (unsigned long long)OCFS2_I(inode)->ip_blkno,
 105			      file->f_path.dentry->d_name.len,
 106			      file->f_path.dentry->d_name.name, mode);
 107
 108	if (file->f_mode & FMODE_WRITE) {
 109		status = dquot_initialize(inode);
 110		if (status)
 111			goto leave;
 112	}
 113
 114	spin_lock(&oi->ip_lock);
 115
 116	/* Check that the inode hasn't been wiped from disk by another
 117	 * node. If it hasn't then we're safe as long as we hold the
 118	 * spin lock until our increment of open count. */
 119	if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_DELETED) {
 120		spin_unlock(&oi->ip_lock);
 121
 122		status = -ENOENT;
 123		goto leave;
 124	}
 125
 126	if (mode & O_DIRECT)
 127		oi->ip_flags |= OCFS2_INODE_OPEN_DIRECT;
 128
 129	oi->ip_open_count++;
 130	spin_unlock(&oi->ip_lock);
 131
 132	status = ocfs2_init_file_private(inode, file);
 133	if (status) {
 134		/*
 135		 * We want to set open count back if we're failing the
 136		 * open.
 137		 */
 138		spin_lock(&oi->ip_lock);
 139		oi->ip_open_count--;
 140		spin_unlock(&oi->ip_lock);
 141	}
 142
 
 
 143leave:
 144	return status;
 145}
 146
 147static int ocfs2_file_release(struct inode *inode, struct file *file)
 148{
 149	struct ocfs2_inode_info *oi = OCFS2_I(inode);
 150
 151	spin_lock(&oi->ip_lock);
 152	if (!--oi->ip_open_count)
 153		oi->ip_flags &= ~OCFS2_INODE_OPEN_DIRECT;
 154
 155	trace_ocfs2_file_release(inode, file, file->f_path.dentry,
 156				 oi->ip_blkno,
 157				 file->f_path.dentry->d_name.len,
 158				 file->f_path.dentry->d_name.name,
 159				 oi->ip_open_count);
 160	spin_unlock(&oi->ip_lock);
 161
 162	ocfs2_free_file_private(inode, file);
 163
 164	return 0;
 165}
 166
 167static int ocfs2_dir_open(struct inode *inode, struct file *file)
 168{
 169	return ocfs2_init_file_private(inode, file);
 170}
 171
 172static int ocfs2_dir_release(struct inode *inode, struct file *file)
 173{
 174	ocfs2_free_file_private(inode, file);
 175	return 0;
 176}
 177
 178static int ocfs2_sync_file(struct file *file, loff_t start, loff_t end,
 179			   int datasync)
 180{
 181	int err = 0;
 182	struct inode *inode = file->f_mapping->host;
 183	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 184	struct ocfs2_inode_info *oi = OCFS2_I(inode);
 185	journal_t *journal = osb->journal->j_journal;
 186	int ret;
 187	tid_t commit_tid;
 188	bool needs_barrier = false;
 189
 190	trace_ocfs2_sync_file(inode, file, file->f_path.dentry,
 191			      OCFS2_I(inode)->ip_blkno,
 192			      file->f_path.dentry->d_name.len,
 193			      file->f_path.dentry->d_name.name,
 194			      (unsigned long long)datasync);
 195
 196	if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
 197		return -EROFS;
 198
 199	err = filemap_write_and_wait_range(inode->i_mapping, start, end);
 200	if (err)
 201		return err;
 202
 203	commit_tid = datasync ? oi->i_datasync_tid : oi->i_sync_tid;
 204	if (journal->j_flags & JBD2_BARRIER &&
 205	    !jbd2_trans_will_send_data_barrier(journal, commit_tid))
 206		needs_barrier = true;
 207	err = jbd2_complete_transaction(journal, commit_tid);
 208	if (needs_barrier) {
 209		ret = blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, NULL);
 210		if (!err)
 211			err = ret;
 212	}
 213
 214	if (err)
 215		mlog_errno(err);
 216
 217	return (err < 0) ? -EIO : 0;
 218}
 219
 220int ocfs2_should_update_atime(struct inode *inode,
 221			      struct vfsmount *vfsmnt)
 222{
 223	struct timespec now;
 224	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 225
 226	if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
 227		return 0;
 228
 229	if ((inode->i_flags & S_NOATIME) ||
 230	    ((inode->i_sb->s_flags & MS_NODIRATIME) && S_ISDIR(inode->i_mode)))
 231		return 0;
 232
 233	/*
 234	 * We can be called with no vfsmnt structure - NFSD will
 235	 * sometimes do this.
 236	 *
 237	 * Note that our action here is different than touch_atime() -
 238	 * if we can't tell whether this is a noatime mount, then we
 239	 * don't know whether to trust the value of s_atime_quantum.
 240	 */
 241	if (vfsmnt == NULL)
 242		return 0;
 243
 244	if ((vfsmnt->mnt_flags & MNT_NOATIME) ||
 245	    ((vfsmnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
 246		return 0;
 247
 248	if (vfsmnt->mnt_flags & MNT_RELATIME) {
 249		if ((timespec_compare(&inode->i_atime, &inode->i_mtime) <= 0) ||
 250		    (timespec_compare(&inode->i_atime, &inode->i_ctime) <= 0))
 
 
 
 
 251			return 1;
 252
 253		return 0;
 254	}
 255
 256	now = current_time(inode);
 257	if ((now.tv_sec - inode->i_atime.tv_sec <= osb->s_atime_quantum))
 258		return 0;
 259	else
 260		return 1;
 261}
 262
 263int ocfs2_update_inode_atime(struct inode *inode,
 264			     struct buffer_head *bh)
 265{
 266	int ret;
 267	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 268	handle_t *handle;
 269	struct ocfs2_dinode *di = (struct ocfs2_dinode *) bh->b_data;
 270
 271	handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
 272	if (IS_ERR(handle)) {
 273		ret = PTR_ERR(handle);
 274		mlog_errno(ret);
 275		goto out;
 276	}
 277
 278	ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), bh,
 279				      OCFS2_JOURNAL_ACCESS_WRITE);
 280	if (ret) {
 281		mlog_errno(ret);
 282		goto out_commit;
 283	}
 284
 285	/*
 286	 * Don't use ocfs2_mark_inode_dirty() here as we don't always
 287	 * have i_mutex to guard against concurrent changes to other
 288	 * inode fields.
 289	 */
 290	inode->i_atime = current_time(inode);
 291	di->i_atime = cpu_to_le64(inode->i_atime.tv_sec);
 292	di->i_atime_nsec = cpu_to_le32(inode->i_atime.tv_nsec);
 293	ocfs2_update_inode_fsync_trans(handle, inode, 0);
 294	ocfs2_journal_dirty(handle, bh);
 295
 296out_commit:
 297	ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
 298out:
 299	return ret;
 300}
 301
 302int ocfs2_set_inode_size(handle_t *handle,
 303				struct inode *inode,
 304				struct buffer_head *fe_bh,
 305				u64 new_i_size)
 306{
 307	int status;
 308
 309	i_size_write(inode, new_i_size);
 310	inode->i_blocks = ocfs2_inode_sector_count(inode);
 311	inode->i_ctime = inode->i_mtime = current_time(inode);
 312
 313	status = ocfs2_mark_inode_dirty(handle, inode, fe_bh);
 314	if (status < 0) {
 315		mlog_errno(status);
 316		goto bail;
 317	}
 318
 319bail:
 320	return status;
 321}
 322
 323int ocfs2_simple_size_update(struct inode *inode,
 324			     struct buffer_head *di_bh,
 325			     u64 new_i_size)
 326{
 327	int ret;
 328	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 329	handle_t *handle = NULL;
 330
 331	handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
 332	if (IS_ERR(handle)) {
 333		ret = PTR_ERR(handle);
 334		mlog_errno(ret);
 335		goto out;
 336	}
 337
 338	ret = ocfs2_set_inode_size(handle, inode, di_bh,
 339				   new_i_size);
 340	if (ret < 0)
 341		mlog_errno(ret);
 342
 343	ocfs2_update_inode_fsync_trans(handle, inode, 0);
 344	ocfs2_commit_trans(osb, handle);
 345out:
 346	return ret;
 347}
 348
 349static int ocfs2_cow_file_pos(struct inode *inode,
 350			      struct buffer_head *fe_bh,
 351			      u64 offset)
 352{
 353	int status;
 354	u32 phys, cpos = offset >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
 355	unsigned int num_clusters = 0;
 356	unsigned int ext_flags = 0;
 357
 358	/*
 359	 * If the new offset is aligned to the range of the cluster, there is
 360	 * no space for ocfs2_zero_range_for_truncate to fill, so no need to
 361	 * CoW either.
 362	 */
 363	if ((offset & (OCFS2_SB(inode->i_sb)->s_clustersize - 1)) == 0)
 364		return 0;
 365
 366	status = ocfs2_get_clusters(inode, cpos, &phys,
 367				    &num_clusters, &ext_flags);
 368	if (status) {
 369		mlog_errno(status);
 370		goto out;
 371	}
 372
 373	if (!(ext_flags & OCFS2_EXT_REFCOUNTED))
 374		goto out;
 375
 376	return ocfs2_refcount_cow(inode, fe_bh, cpos, 1, cpos+1);
 377
 378out:
 379	return status;
 380}
 381
 382static int ocfs2_orphan_for_truncate(struct ocfs2_super *osb,
 383				     struct inode *inode,
 384				     struct buffer_head *fe_bh,
 385				     u64 new_i_size)
 386{
 387	int status;
 388	handle_t *handle;
 389	struct ocfs2_dinode *di;
 390	u64 cluster_bytes;
 391
 392	/*
 393	 * We need to CoW the cluster contains the offset if it is reflinked
 394	 * since we will call ocfs2_zero_range_for_truncate later which will
 395	 * write "0" from offset to the end of the cluster.
 396	 */
 397	status = ocfs2_cow_file_pos(inode, fe_bh, new_i_size);
 398	if (status) {
 399		mlog_errno(status);
 400		return status;
 401	}
 402
 403	/* TODO: This needs to actually orphan the inode in this
 404	 * transaction. */
 405
 406	handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
 407	if (IS_ERR(handle)) {
 408		status = PTR_ERR(handle);
 409		mlog_errno(status);
 410		goto out;
 411	}
 412
 413	status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), fe_bh,
 414					 OCFS2_JOURNAL_ACCESS_WRITE);
 415	if (status < 0) {
 416		mlog_errno(status);
 417		goto out_commit;
 418	}
 419
 420	/*
 421	 * Do this before setting i_size.
 422	 */
 423	cluster_bytes = ocfs2_align_bytes_to_clusters(inode->i_sb, new_i_size);
 424	status = ocfs2_zero_range_for_truncate(inode, handle, new_i_size,
 425					       cluster_bytes);
 426	if (status) {
 427		mlog_errno(status);
 428		goto out_commit;
 429	}
 430
 431	i_size_write(inode, new_i_size);
 432	inode->i_ctime = inode->i_mtime = current_time(inode);
 433
 434	di = (struct ocfs2_dinode *) fe_bh->b_data;
 435	di->i_size = cpu_to_le64(new_i_size);
 436	di->i_ctime = di->i_mtime = cpu_to_le64(inode->i_ctime.tv_sec);
 437	di->i_ctime_nsec = di->i_mtime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
 438	ocfs2_update_inode_fsync_trans(handle, inode, 0);
 439
 440	ocfs2_journal_dirty(handle, fe_bh);
 441
 442out_commit:
 443	ocfs2_commit_trans(osb, handle);
 444out:
 445	return status;
 446}
 447
 448int ocfs2_truncate_file(struct inode *inode,
 449			       struct buffer_head *di_bh,
 450			       u64 new_i_size)
 451{
 452	int status = 0;
 453	struct ocfs2_dinode *fe = NULL;
 454	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 455
 456	/* We trust di_bh because it comes from ocfs2_inode_lock(), which
 457	 * already validated it */
 458	fe = (struct ocfs2_dinode *) di_bh->b_data;
 459
 460	trace_ocfs2_truncate_file((unsigned long long)OCFS2_I(inode)->ip_blkno,
 461				  (unsigned long long)le64_to_cpu(fe->i_size),
 462				  (unsigned long long)new_i_size);
 463
 464	mlog_bug_on_msg(le64_to_cpu(fe->i_size) != i_size_read(inode),
 465			"Inode %llu, inode i_size = %lld != di "
 466			"i_size = %llu, i_flags = 0x%x\n",
 467			(unsigned long long)OCFS2_I(inode)->ip_blkno,
 468			i_size_read(inode),
 469			(unsigned long long)le64_to_cpu(fe->i_size),
 470			le32_to_cpu(fe->i_flags));
 471
 472	if (new_i_size > le64_to_cpu(fe->i_size)) {
 473		trace_ocfs2_truncate_file_error(
 474			(unsigned long long)le64_to_cpu(fe->i_size),
 475			(unsigned long long)new_i_size);
 476		status = -EINVAL;
 477		mlog_errno(status);
 478		goto bail;
 479	}
 480
 481	down_write(&OCFS2_I(inode)->ip_alloc_sem);
 482
 483	ocfs2_resv_discard(&osb->osb_la_resmap,
 484			   &OCFS2_I(inode)->ip_la_data_resv);
 485
 486	/*
 487	 * The inode lock forced other nodes to sync and drop their
 488	 * pages, which (correctly) happens even if we have a truncate
 489	 * without allocation change - ocfs2 cluster sizes can be much
 490	 * greater than page size, so we have to truncate them
 491	 * anyway.
 492	 */
 493	unmap_mapping_range(inode->i_mapping, new_i_size + PAGE_SIZE - 1, 0, 1);
 494	truncate_inode_pages(inode->i_mapping, new_i_size);
 495
 496	if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
 
 
 
 497		status = ocfs2_truncate_inline(inode, di_bh, new_i_size,
 498					       i_size_read(inode), 1);
 499		if (status)
 500			mlog_errno(status);
 501
 502		goto bail_unlock_sem;
 503	}
 504
 505	/* alright, we're going to need to do a full blown alloc size
 506	 * change. Orphan the inode so that recovery can complete the
 507	 * truncate if necessary. This does the task of marking
 508	 * i_size. */
 509	status = ocfs2_orphan_for_truncate(osb, inode, di_bh, new_i_size);
 510	if (status < 0) {
 511		mlog_errno(status);
 512		goto bail_unlock_sem;
 513	}
 514
 
 
 
 515	status = ocfs2_commit_truncate(osb, inode, di_bh);
 516	if (status < 0) {
 517		mlog_errno(status);
 518		goto bail_unlock_sem;
 519	}
 520
 521	/* TODO: orphan dir cleanup here. */
 522bail_unlock_sem:
 523	up_write(&OCFS2_I(inode)->ip_alloc_sem);
 524
 525bail:
 526	if (!status && OCFS2_I(inode)->ip_clusters == 0)
 527		status = ocfs2_try_remove_refcount_tree(inode, di_bh);
 528
 529	return status;
 530}
 531
 532/*
 533 * extend file allocation only here.
 534 * we'll update all the disk stuff, and oip->alloc_size
 535 *
 536 * expect stuff to be locked, a transaction started and enough data /
 537 * metadata reservations in the contexts.
 538 *
 539 * Will return -EAGAIN, and a reason if a restart is needed.
 540 * If passed in, *reason will always be set, even in error.
 541 */
 542int ocfs2_add_inode_data(struct ocfs2_super *osb,
 543			 struct inode *inode,
 544			 u32 *logical_offset,
 545			 u32 clusters_to_add,
 546			 int mark_unwritten,
 547			 struct buffer_head *fe_bh,
 548			 handle_t *handle,
 549			 struct ocfs2_alloc_context *data_ac,
 550			 struct ocfs2_alloc_context *meta_ac,
 551			 enum ocfs2_alloc_restarted *reason_ret)
 552{
 553	int ret;
 554	struct ocfs2_extent_tree et;
 555
 556	ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), fe_bh);
 557	ret = ocfs2_add_clusters_in_btree(handle, &et, logical_offset,
 558					  clusters_to_add, mark_unwritten,
 559					  data_ac, meta_ac, reason_ret);
 560
 561	return ret;
 562}
 563
 564static int __ocfs2_extend_allocation(struct inode *inode, u32 logical_start,
 565				     u32 clusters_to_add, int mark_unwritten)
 566{
 567	int status = 0;
 568	int restart_func = 0;
 569	int credits;
 570	u32 prev_clusters;
 571	struct buffer_head *bh = NULL;
 572	struct ocfs2_dinode *fe = NULL;
 573	handle_t *handle = NULL;
 574	struct ocfs2_alloc_context *data_ac = NULL;
 575	struct ocfs2_alloc_context *meta_ac = NULL;
 576	enum ocfs2_alloc_restarted why = RESTART_NONE;
 577	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 578	struct ocfs2_extent_tree et;
 579	int did_quota = 0;
 580
 581	/*
 582	 * Unwritten extent only exists for file systems which
 583	 * support holes.
 584	 */
 585	BUG_ON(mark_unwritten && !ocfs2_sparse_alloc(osb));
 586
 587	status = ocfs2_read_inode_block(inode, &bh);
 588	if (status < 0) {
 589		mlog_errno(status);
 590		goto leave;
 591	}
 592	fe = (struct ocfs2_dinode *) bh->b_data;
 593
 594restart_all:
 595	BUG_ON(le32_to_cpu(fe->i_clusters) != OCFS2_I(inode)->ip_clusters);
 596
 597	ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), bh);
 598	status = ocfs2_lock_allocators(inode, &et, clusters_to_add, 0,
 599				       &data_ac, &meta_ac);
 600	if (status) {
 601		mlog_errno(status);
 602		goto leave;
 603	}
 604
 605	credits = ocfs2_calc_extend_credits(osb->sb, &fe->id2.i_list);
 606	handle = ocfs2_start_trans(osb, credits);
 607	if (IS_ERR(handle)) {
 608		status = PTR_ERR(handle);
 609		handle = NULL;
 610		mlog_errno(status);
 611		goto leave;
 612	}
 613
 614restarted_transaction:
 615	trace_ocfs2_extend_allocation(
 616		(unsigned long long)OCFS2_I(inode)->ip_blkno,
 617		(unsigned long long)i_size_read(inode),
 618		le32_to_cpu(fe->i_clusters), clusters_to_add,
 619		why, restart_func);
 620
 621	status = dquot_alloc_space_nodirty(inode,
 622			ocfs2_clusters_to_bytes(osb->sb, clusters_to_add));
 623	if (status)
 624		goto leave;
 625	did_quota = 1;
 626
 627	/* reserve a write to the file entry early on - that we if we
 628	 * run out of credits in the allocation path, we can still
 629	 * update i_size. */
 630	status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), bh,
 631					 OCFS2_JOURNAL_ACCESS_WRITE);
 632	if (status < 0) {
 633		mlog_errno(status);
 634		goto leave;
 635	}
 636
 637	prev_clusters = OCFS2_I(inode)->ip_clusters;
 638
 639	status = ocfs2_add_inode_data(osb,
 640				      inode,
 641				      &logical_start,
 642				      clusters_to_add,
 643				      mark_unwritten,
 644				      bh,
 645				      handle,
 646				      data_ac,
 647				      meta_ac,
 648				      &why);
 649	if ((status < 0) && (status != -EAGAIN)) {
 650		if (status != -ENOSPC)
 651			mlog_errno(status);
 652		goto leave;
 653	}
 654	ocfs2_update_inode_fsync_trans(handle, inode, 1);
 655	ocfs2_journal_dirty(handle, bh);
 656
 657	spin_lock(&OCFS2_I(inode)->ip_lock);
 658	clusters_to_add -= (OCFS2_I(inode)->ip_clusters - prev_clusters);
 659	spin_unlock(&OCFS2_I(inode)->ip_lock);
 660	/* Release unused quota reservation */
 661	dquot_free_space(inode,
 662			ocfs2_clusters_to_bytes(osb->sb, clusters_to_add));
 663	did_quota = 0;
 664
 665	if (why != RESTART_NONE && clusters_to_add) {
 666		if (why == RESTART_META) {
 667			restart_func = 1;
 668			status = 0;
 669		} else {
 670			BUG_ON(why != RESTART_TRANS);
 671
 672			status = ocfs2_allocate_extend_trans(handle, 1);
 673			if (status < 0) {
 674				/* handle still has to be committed at
 675				 * this point. */
 676				status = -ENOMEM;
 677				mlog_errno(status);
 678				goto leave;
 679			}
 680			goto restarted_transaction;
 681		}
 682	}
 683
 684	trace_ocfs2_extend_allocation_end(OCFS2_I(inode)->ip_blkno,
 685	     le32_to_cpu(fe->i_clusters),
 686	     (unsigned long long)le64_to_cpu(fe->i_size),
 687	     OCFS2_I(inode)->ip_clusters,
 688	     (unsigned long long)i_size_read(inode));
 689
 690leave:
 691	if (status < 0 && did_quota)
 692		dquot_free_space(inode,
 693			ocfs2_clusters_to_bytes(osb->sb, clusters_to_add));
 694	if (handle) {
 695		ocfs2_commit_trans(osb, handle);
 696		handle = NULL;
 697	}
 698	if (data_ac) {
 699		ocfs2_free_alloc_context(data_ac);
 700		data_ac = NULL;
 701	}
 702	if (meta_ac) {
 703		ocfs2_free_alloc_context(meta_ac);
 704		meta_ac = NULL;
 705	}
 706	if ((!status) && restart_func) {
 707		restart_func = 0;
 708		goto restart_all;
 709	}
 710	brelse(bh);
 711	bh = NULL;
 712
 713	return status;
 714}
 715
 716int ocfs2_extend_allocation(struct inode *inode, u32 logical_start,
 717		u32 clusters_to_add, int mark_unwritten)
 718{
 719	return __ocfs2_extend_allocation(inode, logical_start,
 720			clusters_to_add, mark_unwritten);
 721}
 722
 723/*
 724 * While a write will already be ordering the data, a truncate will not.
 725 * Thus, we need to explicitly order the zeroed pages.
 726 */
 727static handle_t *ocfs2_zero_start_ordered_transaction(struct inode *inode,
 728						struct buffer_head *di_bh)
 
 
 729{
 730	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 731	handle_t *handle = NULL;
 732	int ret = 0;
 733
 734	if (!ocfs2_should_order_data(inode))
 735		goto out;
 736
 737	handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
 738	if (IS_ERR(handle)) {
 739		ret = -ENOMEM;
 740		mlog_errno(ret);
 741		goto out;
 742	}
 743
 744	ret = ocfs2_jbd2_file_inode(handle, inode);
 745	if (ret < 0) {
 746		mlog_errno(ret);
 747		goto out;
 748	}
 749
 750	ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
 751				      OCFS2_JOURNAL_ACCESS_WRITE);
 752	if (ret)
 753		mlog_errno(ret);
 754	ocfs2_update_inode_fsync_trans(handle, inode, 1);
 755
 756out:
 757	if (ret) {
 758		if (!IS_ERR(handle))
 759			ocfs2_commit_trans(osb, handle);
 760		handle = ERR_PTR(ret);
 761	}
 762	return handle;
 763}
 764
 765/* Some parts of this taken from generic_cont_expand, which turned out
 766 * to be too fragile to do exactly what we need without us having to
 767 * worry about recursive locking in ->write_begin() and ->write_end(). */
 768static int ocfs2_write_zero_page(struct inode *inode, u64 abs_from,
 769				 u64 abs_to, struct buffer_head *di_bh)
 770{
 771	struct address_space *mapping = inode->i_mapping;
 772	struct page *page;
 773	unsigned long index = abs_from >> PAGE_SHIFT;
 774	handle_t *handle;
 775	int ret = 0;
 776	unsigned zero_from, zero_to, block_start, block_end;
 777	struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
 778
 779	BUG_ON(abs_from >= abs_to);
 780	BUG_ON(abs_to > (((u64)index + 1) << PAGE_SHIFT));
 781	BUG_ON(abs_from & (inode->i_blkbits - 1));
 782
 783	handle = ocfs2_zero_start_ordered_transaction(inode, di_bh);
 
 
 784	if (IS_ERR(handle)) {
 785		ret = PTR_ERR(handle);
 786		goto out;
 787	}
 788
 789	page = find_or_create_page(mapping, index, GFP_NOFS);
 790	if (!page) {
 791		ret = -ENOMEM;
 792		mlog_errno(ret);
 793		goto out_commit_trans;
 794	}
 795
 796	/* Get the offsets within the page that we want to zero */
 797	zero_from = abs_from & (PAGE_SIZE - 1);
 798	zero_to = abs_to & (PAGE_SIZE - 1);
 799	if (!zero_to)
 800		zero_to = PAGE_SIZE;
 801
 802	trace_ocfs2_write_zero_page(
 803			(unsigned long long)OCFS2_I(inode)->ip_blkno,
 804			(unsigned long long)abs_from,
 805			(unsigned long long)abs_to,
 806			index, zero_from, zero_to);
 807
 808	/* We know that zero_from is block aligned */
 809	for (block_start = zero_from; block_start < zero_to;
 810	     block_start = block_end) {
 811		block_end = block_start + (1 << inode->i_blkbits);
 812
 813		/*
 814		 * block_start is block-aligned.  Bump it by one to force
 815		 * __block_write_begin and block_commit_write to zero the
 816		 * whole block.
 817		 */
 818		ret = __block_write_begin(page, block_start + 1, 0,
 819					  ocfs2_get_block);
 820		if (ret < 0) {
 821			mlog_errno(ret);
 822			goto out_unlock;
 823		}
 824
 825
 826		/* must not update i_size! */
 827		ret = block_commit_write(page, block_start + 1,
 828					 block_start + 1);
 829		if (ret < 0)
 830			mlog_errno(ret);
 831		else
 832			ret = 0;
 833	}
 834
 835	/*
 836	 * fs-writeback will release the dirty pages without page lock
 837	 * whose offset are over inode size, the release happens at
 838	 * block_write_full_page().
 839	 */
 840	i_size_write(inode, abs_to);
 841	inode->i_blocks = ocfs2_inode_sector_count(inode);
 842	di->i_size = cpu_to_le64((u64)i_size_read(inode));
 843	inode->i_mtime = inode->i_ctime = current_time(inode);
 844	di->i_mtime = di->i_ctime = cpu_to_le64(inode->i_mtime.tv_sec);
 845	di->i_ctime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
 846	di->i_mtime_nsec = di->i_ctime_nsec;
 847	if (handle) {
 848		ocfs2_journal_dirty(handle, di_bh);
 849		ocfs2_update_inode_fsync_trans(handle, inode, 1);
 850	}
 851
 852out_unlock:
 853	unlock_page(page);
 854	put_page(page);
 855out_commit_trans:
 856	if (handle)
 857		ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
 858out:
 859	return ret;
 860}
 861
 862/*
 863 * Find the next range to zero.  We do this in terms of bytes because
 864 * that's what ocfs2_zero_extend() wants, and it is dealing with the
 865 * pagecache.  We may return multiple extents.
 866 *
 867 * zero_start and zero_end are ocfs2_zero_extend()s current idea of what
 868 * needs to be zeroed.  range_start and range_end return the next zeroing
 869 * range.  A subsequent call should pass the previous range_end as its
 870 * zero_start.  If range_end is 0, there's nothing to do.
 871 *
 872 * Unwritten extents are skipped over.  Refcounted extents are CoWd.
 873 */
 874static int ocfs2_zero_extend_get_range(struct inode *inode,
 875				       struct buffer_head *di_bh,
 876				       u64 zero_start, u64 zero_end,
 877				       u64 *range_start, u64 *range_end)
 878{
 879	int rc = 0, needs_cow = 0;
 880	u32 p_cpos, zero_clusters = 0;
 881	u32 zero_cpos =
 882		zero_start >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
 883	u32 last_cpos = ocfs2_clusters_for_bytes(inode->i_sb, zero_end);
 884	unsigned int num_clusters = 0;
 885	unsigned int ext_flags = 0;
 886
 887	while (zero_cpos < last_cpos) {
 888		rc = ocfs2_get_clusters(inode, zero_cpos, &p_cpos,
 889					&num_clusters, &ext_flags);
 890		if (rc) {
 891			mlog_errno(rc);
 892			goto out;
 893		}
 894
 895		if (p_cpos && !(ext_flags & OCFS2_EXT_UNWRITTEN)) {
 896			zero_clusters = num_clusters;
 897			if (ext_flags & OCFS2_EXT_REFCOUNTED)
 898				needs_cow = 1;
 899			break;
 900		}
 901
 902		zero_cpos += num_clusters;
 903	}
 904	if (!zero_clusters) {
 905		*range_end = 0;
 906		goto out;
 907	}
 908
 909	while ((zero_cpos + zero_clusters) < last_cpos) {
 910		rc = ocfs2_get_clusters(inode, zero_cpos + zero_clusters,
 911					&p_cpos, &num_clusters,
 912					&ext_flags);
 913		if (rc) {
 914			mlog_errno(rc);
 915			goto out;
 916		}
 917
 918		if (!p_cpos || (ext_flags & OCFS2_EXT_UNWRITTEN))
 919			break;
 920		if (ext_flags & OCFS2_EXT_REFCOUNTED)
 921			needs_cow = 1;
 922		zero_clusters += num_clusters;
 923	}
 924	if ((zero_cpos + zero_clusters) > last_cpos)
 925		zero_clusters = last_cpos - zero_cpos;
 926
 927	if (needs_cow) {
 928		rc = ocfs2_refcount_cow(inode, di_bh, zero_cpos,
 929					zero_clusters, UINT_MAX);
 930		if (rc) {
 931			mlog_errno(rc);
 932			goto out;
 933		}
 934	}
 935
 936	*range_start = ocfs2_clusters_to_bytes(inode->i_sb, zero_cpos);
 937	*range_end = ocfs2_clusters_to_bytes(inode->i_sb,
 938					     zero_cpos + zero_clusters);
 939
 940out:
 941	return rc;
 942}
 943
 944/*
 945 * Zero one range returned from ocfs2_zero_extend_get_range().  The caller
 946 * has made sure that the entire range needs zeroing.
 947 */
 948static int ocfs2_zero_extend_range(struct inode *inode, u64 range_start,
 949				   u64 range_end, struct buffer_head *di_bh)
 950{
 951	int rc = 0;
 952	u64 next_pos;
 953	u64 zero_pos = range_start;
 954
 955	trace_ocfs2_zero_extend_range(
 956			(unsigned long long)OCFS2_I(inode)->ip_blkno,
 957			(unsigned long long)range_start,
 958			(unsigned long long)range_end);
 959	BUG_ON(range_start >= range_end);
 960
 961	while (zero_pos < range_end) {
 962		next_pos = (zero_pos & PAGE_MASK) + PAGE_SIZE;
 963		if (next_pos > range_end)
 964			next_pos = range_end;
 965		rc = ocfs2_write_zero_page(inode, zero_pos, next_pos, di_bh);
 966		if (rc < 0) {
 967			mlog_errno(rc);
 968			break;
 969		}
 970		zero_pos = next_pos;
 971
 972		/*
 973		 * Very large extends have the potential to lock up
 974		 * the cpu for extended periods of time.
 975		 */
 976		cond_resched();
 977	}
 978
 979	return rc;
 980}
 981
 982int ocfs2_zero_extend(struct inode *inode, struct buffer_head *di_bh,
 983		      loff_t zero_to_size)
 984{
 985	int ret = 0;
 986	u64 zero_start, range_start = 0, range_end = 0;
 987	struct super_block *sb = inode->i_sb;
 988
 989	zero_start = ocfs2_align_bytes_to_blocks(sb, i_size_read(inode));
 990	trace_ocfs2_zero_extend((unsigned long long)OCFS2_I(inode)->ip_blkno,
 991				(unsigned long long)zero_start,
 992				(unsigned long long)i_size_read(inode));
 993	while (zero_start < zero_to_size) {
 994		ret = ocfs2_zero_extend_get_range(inode, di_bh, zero_start,
 995						  zero_to_size,
 996						  &range_start,
 997						  &range_end);
 998		if (ret) {
 999			mlog_errno(ret);
1000			break;
1001		}
1002		if (!range_end)
1003			break;
1004		/* Trim the ends */
1005		if (range_start < zero_start)
1006			range_start = zero_start;
1007		if (range_end > zero_to_size)
1008			range_end = zero_to_size;
1009
1010		ret = ocfs2_zero_extend_range(inode, range_start,
1011					      range_end, di_bh);
1012		if (ret) {
1013			mlog_errno(ret);
1014			break;
1015		}
1016		zero_start = range_end;
1017	}
1018
1019	return ret;
1020}
1021
1022int ocfs2_extend_no_holes(struct inode *inode, struct buffer_head *di_bh,
1023			  u64 new_i_size, u64 zero_to)
1024{
1025	int ret;
1026	u32 clusters_to_add;
1027	struct ocfs2_inode_info *oi = OCFS2_I(inode);
1028
1029	/*
1030	 * Only quota files call this without a bh, and they can't be
1031	 * refcounted.
1032	 */
1033	BUG_ON(!di_bh && ocfs2_is_refcount_inode(inode));
1034	BUG_ON(!di_bh && !(oi->ip_flags & OCFS2_INODE_SYSTEM_FILE));
1035
1036	clusters_to_add = ocfs2_clusters_for_bytes(inode->i_sb, new_i_size);
1037	if (clusters_to_add < oi->ip_clusters)
1038		clusters_to_add = 0;
1039	else
1040		clusters_to_add -= oi->ip_clusters;
1041
1042	if (clusters_to_add) {
1043		ret = __ocfs2_extend_allocation(inode, oi->ip_clusters,
1044						clusters_to_add, 0);
1045		if (ret) {
1046			mlog_errno(ret);
1047			goto out;
1048		}
1049	}
1050
1051	/*
1052	 * Call this even if we don't add any clusters to the tree. We
1053	 * still need to zero the area between the old i_size and the
1054	 * new i_size.
1055	 */
1056	ret = ocfs2_zero_extend(inode, di_bh, zero_to);
1057	if (ret < 0)
1058		mlog_errno(ret);
1059
1060out:
1061	return ret;
1062}
1063
1064static int ocfs2_extend_file(struct inode *inode,
1065			     struct buffer_head *di_bh,
1066			     u64 new_i_size)
1067{
1068	int ret = 0;
1069	struct ocfs2_inode_info *oi = OCFS2_I(inode);
1070
1071	BUG_ON(!di_bh);
1072
1073	/* setattr sometimes calls us like this. */
1074	if (new_i_size == 0)
1075		goto out;
1076
1077	if (i_size_read(inode) == new_i_size)
1078		goto out;
1079	BUG_ON(new_i_size < i_size_read(inode));
1080
1081	/*
1082	 * The alloc sem blocks people in read/write from reading our
1083	 * allocation until we're done changing it. We depend on
1084	 * i_mutex to block other extend/truncate calls while we're
1085	 * here.  We even have to hold it for sparse files because there
1086	 * might be some tail zeroing.
1087	 */
1088	down_write(&oi->ip_alloc_sem);
1089
1090	if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1091		/*
1092		 * We can optimize small extends by keeping the inodes
1093		 * inline data.
1094		 */
1095		if (ocfs2_size_fits_inline_data(di_bh, new_i_size)) {
1096			up_write(&oi->ip_alloc_sem);
1097			goto out_update_size;
1098		}
1099
1100		ret = ocfs2_convert_inline_data_to_extents(inode, di_bh);
1101		if (ret) {
1102			up_write(&oi->ip_alloc_sem);
1103			mlog_errno(ret);
1104			goto out;
1105		}
1106	}
1107
1108	if (ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)))
1109		ret = ocfs2_zero_extend(inode, di_bh, new_i_size);
1110	else
1111		ret = ocfs2_extend_no_holes(inode, di_bh, new_i_size,
1112					    new_i_size);
1113
1114	up_write(&oi->ip_alloc_sem);
1115
1116	if (ret < 0) {
1117		mlog_errno(ret);
1118		goto out;
1119	}
1120
1121out_update_size:
1122	ret = ocfs2_simple_size_update(inode, di_bh, new_i_size);
1123	if (ret < 0)
1124		mlog_errno(ret);
1125
1126out:
1127	return ret;
1128}
1129
1130int ocfs2_setattr(struct dentry *dentry, struct iattr *attr)
 
1131{
1132	int status = 0, size_change;
1133	int inode_locked = 0;
1134	struct inode *inode = d_inode(dentry);
1135	struct super_block *sb = inode->i_sb;
1136	struct ocfs2_super *osb = OCFS2_SB(sb);
1137	struct buffer_head *bh = NULL;
1138	handle_t *handle = NULL;
1139	struct dquot *transfer_to[MAXQUOTAS] = { };
1140	int qtype;
 
 
1141
1142	trace_ocfs2_setattr(inode, dentry,
1143			    (unsigned long long)OCFS2_I(inode)->ip_blkno,
1144			    dentry->d_name.len, dentry->d_name.name,
1145			    attr->ia_valid, attr->ia_mode,
1146			    from_kuid(&init_user_ns, attr->ia_uid),
1147			    from_kgid(&init_user_ns, attr->ia_gid));
1148
1149	/* ensuring we don't even attempt to truncate a symlink */
1150	if (S_ISLNK(inode->i_mode))
1151		attr->ia_valid &= ~ATTR_SIZE;
1152
1153#define OCFS2_VALID_ATTRS (ATTR_ATIME | ATTR_MTIME | ATTR_CTIME | ATTR_SIZE \
1154			   | ATTR_GID | ATTR_UID | ATTR_MODE)
1155	if (!(attr->ia_valid & OCFS2_VALID_ATTRS))
1156		return 0;
1157
1158	status = setattr_prepare(dentry, attr);
1159	if (status)
1160		return status;
1161
1162	if (is_quota_modification(inode, attr)) {
1163		status = dquot_initialize(inode);
1164		if (status)
1165			return status;
1166	}
1167	size_change = S_ISREG(inode->i_mode) && attr->ia_valid & ATTR_SIZE;
1168	if (size_change) {
 
 
 
 
 
 
 
1169		status = ocfs2_rw_lock(inode, 1);
1170		if (status < 0) {
1171			mlog_errno(status);
1172			goto bail;
1173		}
1174	}
1175
1176	status = ocfs2_inode_lock(inode, &bh, 1);
1177	if (status < 0) {
1178		if (status != -ENOENT)
1179			mlog_errno(status);
1180		goto bail_unlock_rw;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1181	}
1182	inode_locked = 1;
1183
1184	if (size_change) {
1185		status = inode_newsize_ok(inode, attr->ia_size);
1186		if (status)
1187			goto bail_unlock;
1188
1189		inode_dio_wait(inode);
1190
1191		if (i_size_read(inode) >= attr->ia_size) {
1192			if (ocfs2_should_order_data(inode)) {
1193				status = ocfs2_begin_ordered_truncate(inode,
1194								      attr->ia_size);
1195				if (status)
1196					goto bail_unlock;
1197			}
1198			status = ocfs2_truncate_file(inode, bh, attr->ia_size);
1199		} else
1200			status = ocfs2_extend_file(inode, bh, attr->ia_size);
1201		if (status < 0) {
1202			if (status != -ENOSPC)
1203				mlog_errno(status);
1204			status = -ENOSPC;
1205			goto bail_unlock;
1206		}
1207	}
1208
1209	if ((attr->ia_valid & ATTR_UID && !uid_eq(attr->ia_uid, inode->i_uid)) ||
1210	    (attr->ia_valid & ATTR_GID && !gid_eq(attr->ia_gid, inode->i_gid))) {
1211		/*
1212		 * Gather pointers to quota structures so that allocation /
1213		 * freeing of quota structures happens here and not inside
1214		 * dquot_transfer() where we have problems with lock ordering
1215		 */
1216		if (attr->ia_valid & ATTR_UID && !uid_eq(attr->ia_uid, inode->i_uid)
1217		    && OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1218		    OCFS2_FEATURE_RO_COMPAT_USRQUOTA)) {
1219			transfer_to[USRQUOTA] = dqget(sb, make_kqid_uid(attr->ia_uid));
1220			if (IS_ERR(transfer_to[USRQUOTA])) {
1221				status = PTR_ERR(transfer_to[USRQUOTA]);
 
1222				goto bail_unlock;
1223			}
1224		}
1225		if (attr->ia_valid & ATTR_GID && !gid_eq(attr->ia_gid, inode->i_gid)
1226		    && OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1227		    OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)) {
1228			transfer_to[GRPQUOTA] = dqget(sb, make_kqid_gid(attr->ia_gid));
1229			if (IS_ERR(transfer_to[GRPQUOTA])) {
1230				status = PTR_ERR(transfer_to[GRPQUOTA]);
 
1231				goto bail_unlock;
1232			}
1233		}
 
1234		handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS +
1235					   2 * ocfs2_quota_trans_credits(sb));
1236		if (IS_ERR(handle)) {
1237			status = PTR_ERR(handle);
1238			mlog_errno(status);
1239			goto bail_unlock;
1240		}
1241		status = __dquot_transfer(inode, transfer_to);
1242		if (status < 0)
1243			goto bail_commit;
1244	} else {
 
1245		handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1246		if (IS_ERR(handle)) {
1247			status = PTR_ERR(handle);
1248			mlog_errno(status);
1249			goto bail_unlock;
1250		}
1251	}
1252
1253	setattr_copy(inode, attr);
1254	mark_inode_dirty(inode);
1255
1256	status = ocfs2_mark_inode_dirty(handle, inode, bh);
1257	if (status < 0)
1258		mlog_errno(status);
1259
1260bail_commit:
1261	ocfs2_commit_trans(osb, handle);
 
 
1262bail_unlock:
1263	if (status) {
1264		ocfs2_inode_unlock(inode, 1);
1265		inode_locked = 0;
1266	}
1267bail_unlock_rw:
1268	if (size_change)
1269		ocfs2_rw_unlock(inode, 1);
1270bail:
1271
1272	/* Release quota pointers in case we acquired them */
1273	for (qtype = 0; qtype < OCFS2_MAXQUOTAS; qtype++)
1274		dqput(transfer_to[qtype]);
1275
1276	if (!status && attr->ia_valid & ATTR_MODE) {
1277		status = ocfs2_acl_chmod(inode, bh);
1278		if (status < 0)
1279			mlog_errno(status);
1280	}
1281	if (inode_locked)
1282		ocfs2_inode_unlock(inode, 1);
1283
1284	brelse(bh);
1285	return status;
1286}
1287
1288int ocfs2_getattr(struct vfsmount *mnt,
1289		  struct dentry *dentry,
1290		  struct kstat *stat)
1291{
1292	struct inode *inode = d_inode(dentry);
1293	struct super_block *sb = dentry->d_sb;
1294	struct ocfs2_super *osb = sb->s_fs_info;
1295	int err;
1296
1297	err = ocfs2_inode_revalidate(dentry);
1298	if (err) {
1299		if (err != -ENOENT)
1300			mlog_errno(err);
1301		goto bail;
1302	}
1303
1304	generic_fillattr(inode, stat);
1305	/*
1306	 * If there is inline data in the inode, the inode will normally not
1307	 * have data blocks allocated (it may have an external xattr block).
1308	 * Report at least one sector for such files, so tools like tar, rsync,
1309	 * others don't incorrectly think the file is completely sparse.
1310	 */
1311	if (unlikely(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL))
1312		stat->blocks += (stat->size + 511)>>9;
1313
1314	/* We set the blksize from the cluster size for performance */
1315	stat->blksize = osb->s_clustersize;
1316
1317bail:
1318	return err;
1319}
1320
1321int ocfs2_permission(struct inode *inode, int mask)
 
1322{
1323	int ret;
 
1324
1325	if (mask & MAY_NOT_BLOCK)
1326		return -ECHILD;
1327
1328	ret = ocfs2_inode_lock(inode, NULL, 0);
1329	if (ret) {
1330		if (ret != -ENOENT)
1331			mlog_errno(ret);
1332		goto out;
 
 
 
 
 
 
 
 
 
 
1333	}
1334
1335	ret = generic_permission(inode, mask);
1336
1337	ocfs2_inode_unlock(inode, 0);
1338out:
1339	return ret;
1340}
1341
1342static int __ocfs2_write_remove_suid(struct inode *inode,
1343				     struct buffer_head *bh)
1344{
1345	int ret;
1346	handle_t *handle;
1347	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1348	struct ocfs2_dinode *di;
1349
1350	trace_ocfs2_write_remove_suid(
1351			(unsigned long long)OCFS2_I(inode)->ip_blkno,
1352			inode->i_mode);
1353
1354	handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1355	if (IS_ERR(handle)) {
1356		ret = PTR_ERR(handle);
1357		mlog_errno(ret);
1358		goto out;
1359	}
1360
1361	ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), bh,
1362				      OCFS2_JOURNAL_ACCESS_WRITE);
1363	if (ret < 0) {
1364		mlog_errno(ret);
1365		goto out_trans;
1366	}
1367
1368	inode->i_mode &= ~S_ISUID;
1369	if ((inode->i_mode & S_ISGID) && (inode->i_mode & S_IXGRP))
1370		inode->i_mode &= ~S_ISGID;
1371
1372	di = (struct ocfs2_dinode *) bh->b_data;
1373	di->i_mode = cpu_to_le16(inode->i_mode);
1374	ocfs2_update_inode_fsync_trans(handle, inode, 0);
1375
1376	ocfs2_journal_dirty(handle, bh);
1377
1378out_trans:
1379	ocfs2_commit_trans(osb, handle);
1380out:
1381	return ret;
1382}
1383
1384static int ocfs2_write_remove_suid(struct inode *inode)
1385{
1386	int ret;
1387	struct buffer_head *bh = NULL;
1388
1389	ret = ocfs2_read_inode_block(inode, &bh);
1390	if (ret < 0) {
1391		mlog_errno(ret);
1392		goto out;
1393	}
1394
1395	ret =  __ocfs2_write_remove_suid(inode, bh);
1396out:
1397	brelse(bh);
1398	return ret;
1399}
1400
1401/*
1402 * Allocate enough extents to cover the region starting at byte offset
1403 * start for len bytes. Existing extents are skipped, any extents
1404 * added are marked as "unwritten".
1405 */
1406static int ocfs2_allocate_unwritten_extents(struct inode *inode,
1407					    u64 start, u64 len)
1408{
1409	int ret;
1410	u32 cpos, phys_cpos, clusters, alloc_size;
1411	u64 end = start + len;
1412	struct buffer_head *di_bh = NULL;
1413
1414	if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1415		ret = ocfs2_read_inode_block(inode, &di_bh);
1416		if (ret) {
1417			mlog_errno(ret);
1418			goto out;
1419		}
1420
1421		/*
1422		 * Nothing to do if the requested reservation range
1423		 * fits within the inode.
1424		 */
1425		if (ocfs2_size_fits_inline_data(di_bh, end))
1426			goto out;
1427
1428		ret = ocfs2_convert_inline_data_to_extents(inode, di_bh);
1429		if (ret) {
1430			mlog_errno(ret);
1431			goto out;
1432		}
1433	}
1434
1435	/*
1436	 * We consider both start and len to be inclusive.
1437	 */
1438	cpos = start >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
1439	clusters = ocfs2_clusters_for_bytes(inode->i_sb, start + len);
1440	clusters -= cpos;
1441
1442	while (clusters) {
1443		ret = ocfs2_get_clusters(inode, cpos, &phys_cpos,
1444					 &alloc_size, NULL);
1445		if (ret) {
1446			mlog_errno(ret);
1447			goto out;
1448		}
1449
1450		/*
1451		 * Hole or existing extent len can be arbitrary, so
1452		 * cap it to our own allocation request.
1453		 */
1454		if (alloc_size > clusters)
1455			alloc_size = clusters;
1456
1457		if (phys_cpos) {
1458			/*
1459			 * We already have an allocation at this
1460			 * region so we can safely skip it.
1461			 */
1462			goto next;
1463		}
1464
1465		ret = __ocfs2_extend_allocation(inode, cpos, alloc_size, 1);
1466		if (ret) {
1467			if (ret != -ENOSPC)
1468				mlog_errno(ret);
1469			goto out;
1470		}
1471
1472next:
1473		cpos += alloc_size;
1474		clusters -= alloc_size;
1475	}
1476
1477	ret = 0;
1478out:
1479
1480	brelse(di_bh);
1481	return ret;
1482}
1483
1484/*
1485 * Truncate a byte range, avoiding pages within partial clusters. This
1486 * preserves those pages for the zeroing code to write to.
1487 */
1488static void ocfs2_truncate_cluster_pages(struct inode *inode, u64 byte_start,
1489					 u64 byte_len)
1490{
1491	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1492	loff_t start, end;
1493	struct address_space *mapping = inode->i_mapping;
1494
1495	start = (loff_t)ocfs2_align_bytes_to_clusters(inode->i_sb, byte_start);
1496	end = byte_start + byte_len;
1497	end = end & ~(osb->s_clustersize - 1);
1498
1499	if (start < end) {
1500		unmap_mapping_range(mapping, start, end - start, 0);
1501		truncate_inode_pages_range(mapping, start, end - 1);
1502	}
1503}
1504
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1505static int ocfs2_zero_partial_clusters(struct inode *inode,
1506				       u64 start, u64 len)
1507{
1508	int ret = 0;
1509	u64 tmpend = 0;
1510	u64 end = start + len;
1511	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1512	unsigned int csize = osb->s_clustersize;
1513	handle_t *handle;
 
1514
1515	/*
1516	 * The "start" and "end" values are NOT necessarily part of
1517	 * the range whose allocation is being deleted. Rather, this
1518	 * is what the user passed in with the request. We must zero
1519	 * partial clusters here. There's no need to worry about
1520	 * physical allocation - the zeroing code knows to skip holes.
1521	 */
1522	trace_ocfs2_zero_partial_clusters(
1523		(unsigned long long)OCFS2_I(inode)->ip_blkno,
1524		(unsigned long long)start, (unsigned long long)end);
1525
1526	/*
1527	 * If both edges are on a cluster boundary then there's no
1528	 * zeroing required as the region is part of the allocation to
1529	 * be truncated.
1530	 */
1531	if ((start & (csize - 1)) == 0 && (end & (csize - 1)) == 0)
1532		goto out;
1533
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1534	handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1535	if (IS_ERR(handle)) {
1536		ret = PTR_ERR(handle);
1537		mlog_errno(ret);
1538		goto out;
1539	}
1540
1541	/*
1542	 * If start is on a cluster boundary and end is somewhere in another
1543	 * cluster, we have not COWed the cluster starting at start, unless
1544	 * end is also within the same cluster. So, in this case, we skip this
1545	 * first call to ocfs2_zero_range_for_truncate() truncate and move on
1546	 * to the next one.
1547	 */
1548	if ((start & (csize - 1)) != 0) {
1549		/*
1550		 * We want to get the byte offset of the end of the 1st
1551		 * cluster.
1552		 */
1553		tmpend = (u64)osb->s_clustersize +
1554			(start & ~(osb->s_clustersize - 1));
1555		if (tmpend > end)
1556			tmpend = end;
1557
1558		trace_ocfs2_zero_partial_clusters_range1(
1559			(unsigned long long)start,
1560			(unsigned long long)tmpend);
1561
1562		ret = ocfs2_zero_range_for_truncate(inode, handle, start,
1563						    tmpend);
1564		if (ret)
1565			mlog_errno(ret);
1566	}
1567
1568	if (tmpend < end) {
1569		/*
1570		 * This may make start and end equal, but the zeroing
1571		 * code will skip any work in that case so there's no
1572		 * need to catch it up here.
1573		 */
1574		start = end & ~(osb->s_clustersize - 1);
1575
1576		trace_ocfs2_zero_partial_clusters_range2(
1577			(unsigned long long)start, (unsigned long long)end);
1578
1579		ret = ocfs2_zero_range_for_truncate(inode, handle, start, end);
1580		if (ret)
1581			mlog_errno(ret);
1582	}
1583	ocfs2_update_inode_fsync_trans(handle, inode, 1);
1584
1585	ocfs2_commit_trans(osb, handle);
1586out:
1587	return ret;
1588}
1589
1590static int ocfs2_find_rec(struct ocfs2_extent_list *el, u32 pos)
1591{
1592	int i;
1593	struct ocfs2_extent_rec *rec = NULL;
1594
1595	for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) {
1596
1597		rec = &el->l_recs[i];
1598
1599		if (le32_to_cpu(rec->e_cpos) < pos)
1600			break;
1601	}
1602
1603	return i;
1604}
1605
1606/*
1607 * Helper to calculate the punching pos and length in one run, we handle the
1608 * following three cases in order:
1609 *
1610 * - remove the entire record
1611 * - remove a partial record
1612 * - no record needs to be removed (hole-punching completed)
1613*/
1614static void ocfs2_calc_trunc_pos(struct inode *inode,
1615				 struct ocfs2_extent_list *el,
1616				 struct ocfs2_extent_rec *rec,
1617				 u32 trunc_start, u32 *trunc_cpos,
1618				 u32 *trunc_len, u32 *trunc_end,
1619				 u64 *blkno, int *done)
1620{
1621	int ret = 0;
1622	u32 coff, range;
1623
1624	range = le32_to_cpu(rec->e_cpos) + ocfs2_rec_clusters(el, rec);
1625
1626	if (le32_to_cpu(rec->e_cpos) >= trunc_start) {
1627		/*
1628		 * remove an entire extent record.
1629		 */
1630		*trunc_cpos = le32_to_cpu(rec->e_cpos);
1631		/*
1632		 * Skip holes if any.
1633		 */
1634		if (range < *trunc_end)
1635			*trunc_end = range;
1636		*trunc_len = *trunc_end - le32_to_cpu(rec->e_cpos);
1637		*blkno = le64_to_cpu(rec->e_blkno);
1638		*trunc_end = le32_to_cpu(rec->e_cpos);
1639	} else if (range > trunc_start) {
1640		/*
1641		 * remove a partial extent record, which means we're
1642		 * removing the last extent record.
1643		 */
1644		*trunc_cpos = trunc_start;
1645		/*
1646		 * skip hole if any.
1647		 */
1648		if (range < *trunc_end)
1649			*trunc_end = range;
1650		*trunc_len = *trunc_end - trunc_start;
1651		coff = trunc_start - le32_to_cpu(rec->e_cpos);
1652		*blkno = le64_to_cpu(rec->e_blkno) +
1653				ocfs2_clusters_to_blocks(inode->i_sb, coff);
1654		*trunc_end = trunc_start;
1655	} else {
1656		/*
1657		 * It may have two following possibilities:
1658		 *
1659		 * - last record has been removed
1660		 * - trunc_start was within a hole
1661		 *
1662		 * both two cases mean the completion of hole punching.
1663		 */
1664		ret = 1;
1665	}
1666
1667	*done = ret;
1668}
1669
1670int ocfs2_remove_inode_range(struct inode *inode,
1671			     struct buffer_head *di_bh, u64 byte_start,
1672			     u64 byte_len)
1673{
1674	int ret = 0, flags = 0, done = 0, i;
1675	u32 trunc_start, trunc_len, trunc_end, trunc_cpos, phys_cpos;
1676	u32 cluster_in_el;
1677	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1678	struct ocfs2_cached_dealloc_ctxt dealloc;
1679	struct address_space *mapping = inode->i_mapping;
1680	struct ocfs2_extent_tree et;
1681	struct ocfs2_path *path = NULL;
1682	struct ocfs2_extent_list *el = NULL;
1683	struct ocfs2_extent_rec *rec = NULL;
1684	struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
1685	u64 blkno, refcount_loc = le64_to_cpu(di->i_refcount_loc);
1686
1687	ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), di_bh);
1688	ocfs2_init_dealloc_ctxt(&dealloc);
1689
1690	trace_ocfs2_remove_inode_range(
1691			(unsigned long long)OCFS2_I(inode)->ip_blkno,
1692			(unsigned long long)byte_start,
1693			(unsigned long long)byte_len);
1694
1695	if (byte_len == 0)
1696		return 0;
1697
1698	if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1699		ret = ocfs2_truncate_inline(inode, di_bh, byte_start,
1700					    byte_start + byte_len, 0);
1701		if (ret) {
1702			mlog_errno(ret);
1703			goto out;
1704		}
1705		/*
1706		 * There's no need to get fancy with the page cache
1707		 * truncate of an inline-data inode. We're talking
1708		 * about less than a page here, which will be cached
1709		 * in the dinode buffer anyway.
1710		 */
1711		unmap_mapping_range(mapping, 0, 0, 0);
1712		truncate_inode_pages(mapping, 0);
1713		goto out;
1714	}
1715
1716	/*
1717	 * For reflinks, we may need to CoW 2 clusters which might be
1718	 * partially zero'd later, if hole's start and end offset were
1719	 * within one cluster(means is not exactly aligned to clustersize).
1720	 */
1721
1722	if (ocfs2_is_refcount_inode(inode)) {
1723		ret = ocfs2_cow_file_pos(inode, di_bh, byte_start);
1724		if (ret) {
1725			mlog_errno(ret);
1726			goto out;
1727		}
1728
1729		ret = ocfs2_cow_file_pos(inode, di_bh, byte_start + byte_len);
1730		if (ret) {
1731			mlog_errno(ret);
1732			goto out;
1733		}
1734	}
1735
1736	trunc_start = ocfs2_clusters_for_bytes(osb->sb, byte_start);
1737	trunc_end = (byte_start + byte_len) >> osb->s_clustersize_bits;
1738	cluster_in_el = trunc_end;
1739
1740	ret = ocfs2_zero_partial_clusters(inode, byte_start, byte_len);
1741	if (ret) {
1742		mlog_errno(ret);
1743		goto out;
1744	}
1745
1746	path = ocfs2_new_path_from_et(&et);
1747	if (!path) {
1748		ret = -ENOMEM;
1749		mlog_errno(ret);
1750		goto out;
1751	}
1752
1753	while (trunc_end > trunc_start) {
1754
1755		ret = ocfs2_find_path(INODE_CACHE(inode), path,
1756				      cluster_in_el);
1757		if (ret) {
1758			mlog_errno(ret);
1759			goto out;
1760		}
1761
1762		el = path_leaf_el(path);
1763
1764		i = ocfs2_find_rec(el, trunc_end);
1765		/*
1766		 * Need to go to previous extent block.
1767		 */
1768		if (i < 0) {
1769			if (path->p_tree_depth == 0)
1770				break;
1771
1772			ret = ocfs2_find_cpos_for_left_leaf(inode->i_sb,
1773							    path,
1774							    &cluster_in_el);
1775			if (ret) {
1776				mlog_errno(ret);
1777				goto out;
1778			}
1779
1780			/*
1781			 * We've reached the leftmost extent block,
1782			 * it's safe to leave.
1783			 */
1784			if (cluster_in_el == 0)
1785				break;
1786
1787			/*
1788			 * The 'pos' searched for previous extent block is
1789			 * always one cluster less than actual trunc_end.
1790			 */
1791			trunc_end = cluster_in_el + 1;
1792
1793			ocfs2_reinit_path(path, 1);
1794
1795			continue;
1796
1797		} else
1798			rec = &el->l_recs[i];
1799
1800		ocfs2_calc_trunc_pos(inode, el, rec, trunc_start, &trunc_cpos,
1801				     &trunc_len, &trunc_end, &blkno, &done);
1802		if (done)
1803			break;
1804
1805		flags = rec->e_flags;
1806		phys_cpos = ocfs2_blocks_to_clusters(inode->i_sb, blkno);
1807
1808		ret = ocfs2_remove_btree_range(inode, &et, trunc_cpos,
1809					       phys_cpos, trunc_len, flags,
1810					       &dealloc, refcount_loc, false);
1811		if (ret < 0) {
1812			mlog_errno(ret);
1813			goto out;
1814		}
1815
1816		cluster_in_el = trunc_end;
1817
1818		ocfs2_reinit_path(path, 1);
1819	}
1820
1821	ocfs2_truncate_cluster_pages(inode, byte_start, byte_len);
1822
1823out:
1824	ocfs2_free_path(path);
1825	ocfs2_schedule_truncate_log_flush(osb, 1);
1826	ocfs2_run_deallocs(osb, &dealloc);
1827
1828	return ret;
1829}
1830
1831/*
1832 * Parts of this function taken from xfs_change_file_space()
1833 */
1834static int __ocfs2_change_file_space(struct file *file, struct inode *inode,
1835				     loff_t f_pos, unsigned int cmd,
1836				     struct ocfs2_space_resv *sr,
1837				     int change_size)
1838{
1839	int ret;
1840	s64 llen;
1841	loff_t size;
1842	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1843	struct buffer_head *di_bh = NULL;
1844	handle_t *handle;
1845	unsigned long long max_off = inode->i_sb->s_maxbytes;
1846
1847	if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
1848		return -EROFS;
1849
1850	inode_lock(inode);
1851
1852	/*
1853	 * This prevents concurrent writes on other nodes
1854	 */
1855	ret = ocfs2_rw_lock(inode, 1);
1856	if (ret) {
1857		mlog_errno(ret);
1858		goto out;
1859	}
1860
1861	ret = ocfs2_inode_lock(inode, &di_bh, 1);
1862	if (ret) {
1863		mlog_errno(ret);
1864		goto out_rw_unlock;
1865	}
1866
1867	if (inode->i_flags & (S_IMMUTABLE|S_APPEND)) {
1868		ret = -EPERM;
1869		goto out_inode_unlock;
1870	}
1871
1872	switch (sr->l_whence) {
1873	case 0: /*SEEK_SET*/
1874		break;
1875	case 1: /*SEEK_CUR*/
1876		sr->l_start += f_pos;
1877		break;
1878	case 2: /*SEEK_END*/
1879		sr->l_start += i_size_read(inode);
1880		break;
1881	default:
1882		ret = -EINVAL;
1883		goto out_inode_unlock;
1884	}
1885	sr->l_whence = 0;
1886
1887	llen = sr->l_len > 0 ? sr->l_len - 1 : sr->l_len;
1888
1889	if (sr->l_start < 0
1890	    || sr->l_start > max_off
1891	    || (sr->l_start + llen) < 0
1892	    || (sr->l_start + llen) > max_off) {
1893		ret = -EINVAL;
1894		goto out_inode_unlock;
1895	}
1896	size = sr->l_start + sr->l_len;
1897
1898	if (cmd == OCFS2_IOC_RESVSP || cmd == OCFS2_IOC_RESVSP64 ||
1899	    cmd == OCFS2_IOC_UNRESVSP || cmd == OCFS2_IOC_UNRESVSP64) {
1900		if (sr->l_len <= 0) {
1901			ret = -EINVAL;
1902			goto out_inode_unlock;
1903		}
1904	}
1905
1906	if (file && should_remove_suid(file->f_path.dentry)) {
1907		ret = __ocfs2_write_remove_suid(inode, di_bh);
1908		if (ret) {
1909			mlog_errno(ret);
1910			goto out_inode_unlock;
1911		}
1912	}
1913
1914	down_write(&OCFS2_I(inode)->ip_alloc_sem);
1915	switch (cmd) {
1916	case OCFS2_IOC_RESVSP:
1917	case OCFS2_IOC_RESVSP64:
1918		/*
1919		 * This takes unsigned offsets, but the signed ones we
1920		 * pass have been checked against overflow above.
1921		 */
1922		ret = ocfs2_allocate_unwritten_extents(inode, sr->l_start,
1923						       sr->l_len);
1924		break;
1925	case OCFS2_IOC_UNRESVSP:
1926	case OCFS2_IOC_UNRESVSP64:
1927		ret = ocfs2_remove_inode_range(inode, di_bh, sr->l_start,
1928					       sr->l_len);
1929		break;
1930	default:
1931		ret = -EINVAL;
1932	}
 
 
 
 
 
 
 
 
 
1933	up_write(&OCFS2_I(inode)->ip_alloc_sem);
1934	if (ret) {
1935		mlog_errno(ret);
1936		goto out_inode_unlock;
1937	}
1938
1939	/*
1940	 * We update c/mtime for these changes
1941	 */
1942	handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1943	if (IS_ERR(handle)) {
1944		ret = PTR_ERR(handle);
1945		mlog_errno(ret);
1946		goto out_inode_unlock;
1947	}
1948
1949	if (change_size && i_size_read(inode) < size)
1950		i_size_write(inode, size);
1951
1952	inode->i_ctime = inode->i_mtime = current_time(inode);
1953	ret = ocfs2_mark_inode_dirty(handle, inode, di_bh);
1954	if (ret < 0)
1955		mlog_errno(ret);
1956
1957	if (file && (file->f_flags & O_SYNC))
1958		handle->h_sync = 1;
1959
1960	ocfs2_commit_trans(osb, handle);
1961
1962out_inode_unlock:
1963	brelse(di_bh);
1964	ocfs2_inode_unlock(inode, 1);
1965out_rw_unlock:
1966	ocfs2_rw_unlock(inode, 1);
1967
1968out:
1969	inode_unlock(inode);
1970	return ret;
1971}
1972
1973int ocfs2_change_file_space(struct file *file, unsigned int cmd,
1974			    struct ocfs2_space_resv *sr)
1975{
1976	struct inode *inode = file_inode(file);
1977	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1978	int ret;
1979
1980	if ((cmd == OCFS2_IOC_RESVSP || cmd == OCFS2_IOC_RESVSP64) &&
1981	    !ocfs2_writes_unwritten_extents(osb))
1982		return -ENOTTY;
1983	else if ((cmd == OCFS2_IOC_UNRESVSP || cmd == OCFS2_IOC_UNRESVSP64) &&
1984		 !ocfs2_sparse_alloc(osb))
1985		return -ENOTTY;
1986
1987	if (!S_ISREG(inode->i_mode))
1988		return -EINVAL;
1989
1990	if (!(file->f_mode & FMODE_WRITE))
1991		return -EBADF;
1992
1993	ret = mnt_want_write_file(file);
1994	if (ret)
1995		return ret;
1996	ret = __ocfs2_change_file_space(file, inode, file->f_pos, cmd, sr, 0);
1997	mnt_drop_write_file(file);
1998	return ret;
1999}
2000
2001static long ocfs2_fallocate(struct file *file, int mode, loff_t offset,
2002			    loff_t len)
2003{
2004	struct inode *inode = file_inode(file);
2005	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2006	struct ocfs2_space_resv sr;
2007	int change_size = 1;
2008	int cmd = OCFS2_IOC_RESVSP64;
 
2009
2010	if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
2011		return -EOPNOTSUPP;
2012	if (!ocfs2_writes_unwritten_extents(osb))
2013		return -EOPNOTSUPP;
2014
2015	if (mode & FALLOC_FL_KEEP_SIZE)
2016		change_size = 0;
 
 
 
 
 
2017
2018	if (mode & FALLOC_FL_PUNCH_HOLE)
2019		cmd = OCFS2_IOC_UNRESVSP64;
2020
2021	sr.l_whence = 0;
2022	sr.l_start = (s64)offset;
2023	sr.l_len = (s64)len;
2024
2025	return __ocfs2_change_file_space(NULL, inode, offset, cmd, &sr,
2026					 change_size);
2027}
2028
2029int ocfs2_check_range_for_refcount(struct inode *inode, loff_t pos,
2030				   size_t count)
2031{
2032	int ret = 0;
2033	unsigned int extent_flags;
2034	u32 cpos, clusters, extent_len, phys_cpos;
2035	struct super_block *sb = inode->i_sb;
2036
2037	if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb)) ||
2038	    !ocfs2_is_refcount_inode(inode) ||
2039	    OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
2040		return 0;
2041
2042	cpos = pos >> OCFS2_SB(sb)->s_clustersize_bits;
2043	clusters = ocfs2_clusters_for_bytes(sb, pos + count) - cpos;
2044
2045	while (clusters) {
2046		ret = ocfs2_get_clusters(inode, cpos, &phys_cpos, &extent_len,
2047					 &extent_flags);
2048		if (ret < 0) {
2049			mlog_errno(ret);
2050			goto out;
2051		}
2052
2053		if (phys_cpos && (extent_flags & OCFS2_EXT_REFCOUNTED)) {
2054			ret = 1;
2055			break;
2056		}
2057
2058		if (extent_len > clusters)
2059			extent_len = clusters;
2060
2061		clusters -= extent_len;
2062		cpos += extent_len;
2063	}
2064out:
2065	return ret;
2066}
2067
2068static int ocfs2_is_io_unaligned(struct inode *inode, size_t count, loff_t pos)
2069{
2070	int blockmask = inode->i_sb->s_blocksize - 1;
2071	loff_t final_size = pos + count;
2072
2073	if ((pos & blockmask) || (final_size & blockmask))
2074		return 1;
2075	return 0;
2076}
2077
2078static int ocfs2_prepare_inode_for_refcount(struct inode *inode,
2079					    struct file *file,
2080					    loff_t pos, size_t count,
2081					    int *meta_level)
 
2082{
2083	int ret;
2084	struct buffer_head *di_bh = NULL;
2085	u32 cpos = pos >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
2086	u32 clusters =
2087		ocfs2_clusters_for_bytes(inode->i_sb, pos + count) - cpos;
2088
2089	ret = ocfs2_inode_lock(inode, &di_bh, 1);
2090	if (ret) {
2091		mlog_errno(ret);
 
 
2092		goto out;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2093	}
2094
2095	*meta_level = 1;
2096
2097	ret = ocfs2_refcount_cow(inode, di_bh, cpos, clusters, UINT_MAX);
2098	if (ret)
2099		mlog_errno(ret);
 
2100out:
2101	brelse(di_bh);
2102	return ret;
2103}
2104
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2105static int ocfs2_prepare_inode_for_write(struct file *file,
2106					 loff_t pos,
2107					 size_t count)
2108{
2109	int ret = 0, meta_level = 0;
 
2110	struct dentry *dentry = file->f_path.dentry;
2111	struct inode *inode = d_inode(dentry);
2112	loff_t end;
 
 
2113
2114	/*
2115	 * We start with a read level meta lock and only jump to an ex
2116	 * if we need to make modifications here.
2117	 */
2118	for(;;) {
2119		ret = ocfs2_inode_lock(inode, NULL, meta_level);
 
 
 
 
2120		if (ret < 0) {
2121			meta_level = -1;
2122			mlog_errno(ret);
2123			goto out;
2124		}
2125
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2126		/* Clear suid / sgid if necessary. We do this here
2127		 * instead of later in the write path because
2128		 * remove_suid() calls ->setattr without any hint that
2129		 * we may have already done our cluster locking. Since
2130		 * ocfs2_setattr() *must* take cluster locks to
2131		 * proceed, this will lead us to recursively lock the
2132		 * inode. There's also the dinode i_size state which
2133		 * can be lost via setattr during extending writes (we
2134		 * set inode->i_size at the end of a write. */
2135		if (should_remove_suid(dentry)) {
2136			if (meta_level == 0) {
2137				ocfs2_inode_unlock(inode, meta_level);
 
 
 
2138				meta_level = 1;
2139				continue;
2140			}
2141
2142			ret = ocfs2_write_remove_suid(inode);
2143			if (ret < 0) {
2144				mlog_errno(ret);
2145				goto out_unlock;
2146			}
2147		}
2148
2149		end = pos + count;
2150
2151		ret = ocfs2_check_range_for_refcount(inode, pos, count);
2152		if (ret == 1) {
2153			ocfs2_inode_unlock(inode, meta_level);
2154			meta_level = -1;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2155
2156			ret = ocfs2_prepare_inode_for_refcount(inode,
2157							       file,
2158							       pos,
2159							       count,
2160							       &meta_level);
2161		}
2162
2163		if (ret < 0) {
2164			mlog_errno(ret);
 
2165			goto out_unlock;
2166		}
2167
2168		break;
2169	}
2170
2171out_unlock:
2172	trace_ocfs2_prepare_inode_for_write(OCFS2_I(inode)->ip_blkno,
2173					    pos, count);
2174
2175	if (meta_level >= 0)
2176		ocfs2_inode_unlock(inode, meta_level);
 
 
2177
2178out:
2179	return ret;
2180}
2181
2182static ssize_t ocfs2_file_write_iter(struct kiocb *iocb,
2183				    struct iov_iter *from)
2184{
2185	int direct_io, rw_level;
2186	ssize_t written = 0;
2187	ssize_t ret;
2188	size_t count = iov_iter_count(from);
2189	struct file *file = iocb->ki_filp;
2190	struct inode *inode = file_inode(file);
2191	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2192	int full_coherency = !(osb->s_mount_opt &
2193			       OCFS2_MOUNT_COHERENCY_BUFFERED);
2194	void *saved_ki_complete = NULL;
2195	int append_write = ((iocb->ki_pos + count) >=
2196			i_size_read(inode) ? 1 : 0);
 
 
2197
2198	trace_ocfs2_file_aio_write(inode, file, file->f_path.dentry,
2199		(unsigned long long)OCFS2_I(inode)->ip_blkno,
2200		file->f_path.dentry->d_name.len,
2201		file->f_path.dentry->d_name.name,
2202		(unsigned int)from->nr_segs);	/* GRRRRR */
2203
 
 
 
2204	if (count == 0)
2205		return 0;
2206
2207	direct_io = iocb->ki_flags & IOCB_DIRECT ? 1 : 0;
2208
2209	inode_lock(inode);
 
 
2210
2211	/*
2212	 * Concurrent O_DIRECT writes are allowed with
2213	 * mount_option "coherency=buffered".
2214	 * For append write, we must take rw EX.
2215	 */
2216	rw_level = (!direct_io || full_coherency || append_write);
2217
2218	ret = ocfs2_rw_lock(inode, rw_level);
 
 
 
2219	if (ret < 0) {
2220		mlog_errno(ret);
 
2221		goto out_mutex;
2222	}
2223
2224	/*
2225	 * O_DIRECT writes with "coherency=full" need to take EX cluster
2226	 * inode_lock to guarantee coherency.
2227	 */
2228	if (direct_io && full_coherency) {
2229		/*
2230		 * We need to take and drop the inode lock to force
2231		 * other nodes to drop their caches.  Buffered I/O
2232		 * already does this in write_begin().
2233		 */
2234		ret = ocfs2_inode_lock(inode, NULL, 1);
 
 
 
2235		if (ret < 0) {
2236			mlog_errno(ret);
 
2237			goto out;
2238		}
2239
2240		ocfs2_inode_unlock(inode, 1);
2241	}
2242
2243	ret = generic_write_checks(iocb, from);
2244	if (ret <= 0) {
2245		if (ret)
2246			mlog_errno(ret);
2247		goto out;
2248	}
2249	count = ret;
2250
2251	ret = ocfs2_prepare_inode_for_write(file, iocb->ki_pos, count);
2252	if (ret < 0) {
2253		mlog_errno(ret);
 
2254		goto out;
2255	}
2256
2257	if (direct_io && !is_sync_kiocb(iocb) &&
2258	    ocfs2_is_io_unaligned(inode, count, iocb->ki_pos)) {
2259		/*
2260		 * Make it a sync io if it's an unaligned aio.
2261		 */
2262		saved_ki_complete = xchg(&iocb->ki_complete, NULL);
2263	}
2264
2265	/* communicate with ocfs2_dio_end_io */
2266	ocfs2_iocb_set_rw_locked(iocb, rw_level);
2267
2268	written = __generic_file_write_iter(iocb, from);
2269	/* buffered aio wouldn't have proper lock coverage today */
2270	BUG_ON(written == -EIOCBQUEUED && !(iocb->ki_flags & IOCB_DIRECT));
2271
2272	/*
2273	 * deep in g_f_a_w_n()->ocfs2_direct_IO we pass in a ocfs2_dio_end_io
2274	 * function pointer which is called when o_direct io completes so that
2275	 * it can unlock our rw lock.
2276	 * Unfortunately there are error cases which call end_io and others
2277	 * that don't.  so we don't have to unlock the rw_lock if either an
2278	 * async dio is going to do it in the future or an end_io after an
2279	 * error has already done it.
2280	 */
2281	if ((written == -EIOCBQUEUED) || (!ocfs2_iocb_is_rw_locked(iocb))) {
2282		rw_level = -1;
2283	}
2284
2285	if (unlikely(written <= 0))
2286		goto out;
2287
2288	if (((file->f_flags & O_DSYNC) && !direct_io) ||
2289	    IS_SYNC(inode)) {
2290		ret = filemap_fdatawrite_range(file->f_mapping,
2291					       iocb->ki_pos - written,
2292					       iocb->ki_pos - 1);
2293		if (ret < 0)
2294			written = ret;
2295
2296		if (!ret) {
2297			ret = jbd2_journal_force_commit(osb->journal->j_journal);
2298			if (ret < 0)
2299				written = ret;
2300		}
2301
2302		if (!ret)
2303			ret = filemap_fdatawait_range(file->f_mapping,
2304						      iocb->ki_pos - written,
2305						      iocb->ki_pos - 1);
2306	}
2307
2308out:
2309	if (saved_ki_complete)
2310		xchg(&iocb->ki_complete, saved_ki_complete);
2311
2312	if (rw_level != -1)
2313		ocfs2_rw_unlock(inode, rw_level);
2314
2315out_mutex:
2316	inode_unlock(inode);
2317
2318	if (written)
2319		ret = written;
2320	return ret;
2321}
2322
2323static ssize_t ocfs2_file_read_iter(struct kiocb *iocb,
2324				   struct iov_iter *to)
2325{
2326	int ret = 0, rw_level = -1, lock_level = 0;
2327	struct file *filp = iocb->ki_filp;
2328	struct inode *inode = file_inode(filp);
 
 
2329
2330	trace_ocfs2_file_aio_read(inode, filp, filp->f_path.dentry,
2331			(unsigned long long)OCFS2_I(inode)->ip_blkno,
2332			filp->f_path.dentry->d_name.len,
2333			filp->f_path.dentry->d_name.name,
2334			to->nr_segs);	/* GRRRRR */
2335
2336
2337	if (!inode) {
2338		ret = -EINVAL;
2339		mlog_errno(ret);
2340		goto bail;
2341	}
2342
 
 
 
2343	/*
2344	 * buffered reads protect themselves in ->readpage().  O_DIRECT reads
2345	 * need locks to protect pending reads from racing with truncate.
2346	 */
2347	if (iocb->ki_flags & IOCB_DIRECT) {
2348		ret = ocfs2_rw_lock(inode, 0);
 
 
 
 
2349		if (ret < 0) {
2350			mlog_errno(ret);
 
2351			goto bail;
2352		}
2353		rw_level = 0;
2354		/* communicate with ocfs2_dio_end_io */
2355		ocfs2_iocb_set_rw_locked(iocb, rw_level);
2356	}
2357
2358	/*
2359	 * We're fine letting folks race truncates and extending
2360	 * writes with read across the cluster, just like they can
2361	 * locally. Hence no rw_lock during read.
2362	 *
2363	 * Take and drop the meta data lock to update inode fields
2364	 * like i_size. This allows the checks down below
2365	 * generic_file_aio_read() a chance of actually working.
2366	 */
2367	ret = ocfs2_inode_lock_atime(inode, filp->f_path.mnt, &lock_level);
 
2368	if (ret < 0) {
2369		mlog_errno(ret);
 
2370		goto bail;
2371	}
2372	ocfs2_inode_unlock(inode, lock_level);
2373
2374	ret = generic_file_read_iter(iocb, to);
2375	trace_generic_file_aio_read_ret(ret);
2376
2377	/* buffered aio wouldn't have proper lock coverage today */
2378	BUG_ON(ret == -EIOCBQUEUED && !(iocb->ki_flags & IOCB_DIRECT));
2379
2380	/* see ocfs2_file_write_iter */
2381	if (ret == -EIOCBQUEUED || !ocfs2_iocb_is_rw_locked(iocb)) {
2382		rw_level = -1;
2383	}
2384
2385bail:
2386	if (rw_level != -1)
2387		ocfs2_rw_unlock(inode, rw_level);
2388
2389	return ret;
2390}
2391
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2392/* Refer generic_file_llseek_unlocked() */
2393static loff_t ocfs2_file_llseek(struct file *file, loff_t offset, int whence)
2394{
2395	struct inode *inode = file->f_mapping->host;
2396	int ret = 0;
2397
2398	inode_lock(inode);
2399
2400	switch (whence) {
2401	case SEEK_SET:
2402		break;
2403	case SEEK_END:
2404		/* SEEK_END requires the OCFS2 inode lock for the file
2405		 * because it references the file's size.
2406		 */
2407		ret = ocfs2_inode_lock(inode, NULL, 0);
2408		if (ret < 0) {
2409			mlog_errno(ret);
2410			goto out;
2411		}
2412		offset += i_size_read(inode);
2413		ocfs2_inode_unlock(inode, 0);
2414		break;
2415	case SEEK_CUR:
2416		if (offset == 0) {
2417			offset = file->f_pos;
2418			goto out;
2419		}
2420		offset += file->f_pos;
2421		break;
2422	case SEEK_DATA:
2423	case SEEK_HOLE:
2424		ret = ocfs2_seek_data_hole_offset(file, &offset, whence);
2425		if (ret)
2426			goto out;
2427		break;
2428	default:
2429		ret = -EINVAL;
2430		goto out;
2431	}
2432
2433	offset = vfs_setpos(file, offset, inode->i_sb->s_maxbytes);
2434
2435out:
2436	inode_unlock(inode);
2437	if (ret)
2438		return ret;
2439	return offset;
2440}
2441
2442static int ocfs2_file_clone_range(struct file *file_in,
2443				  loff_t pos_in,
2444				  struct file *file_out,
2445				  loff_t pos_out,
2446				  u64 len)
2447{
2448	return ocfs2_reflink_remap_range(file_in, pos_in, file_out, pos_out,
2449					 len, false);
2450}
2451
2452static ssize_t ocfs2_file_dedupe_range(struct file *src_file,
2453				       u64 loff,
2454				       u64 len,
2455				       struct file *dst_file,
2456				       u64 dst_loff)
2457{
2458	int error;
2459
2460	error = ocfs2_reflink_remap_range(src_file, loff, dst_file, dst_loff,
2461					  len, true);
2462	if (error)
2463		return error;
2464	return len;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2465}
2466
2467const struct inode_operations ocfs2_file_iops = {
2468	.setattr	= ocfs2_setattr,
2469	.getattr	= ocfs2_getattr,
2470	.permission	= ocfs2_permission,
2471	.listxattr	= ocfs2_listxattr,
2472	.fiemap		= ocfs2_fiemap,
2473	.get_acl	= ocfs2_iop_get_acl,
2474	.set_acl	= ocfs2_iop_set_acl,
 
 
2475};
2476
2477const struct inode_operations ocfs2_special_file_iops = {
2478	.setattr	= ocfs2_setattr,
2479	.getattr	= ocfs2_getattr,
2480	.permission	= ocfs2_permission,
2481	.get_acl	= ocfs2_iop_get_acl,
2482	.set_acl	= ocfs2_iop_set_acl,
2483};
2484
2485/*
2486 * Other than ->lock, keep ocfs2_fops and ocfs2_dops in sync with
2487 * ocfs2_fops_no_plocks and ocfs2_dops_no_plocks!
2488 */
2489const struct file_operations ocfs2_fops = {
2490	.llseek		= ocfs2_file_llseek,
2491	.mmap		= ocfs2_mmap,
2492	.fsync		= ocfs2_sync_file,
2493	.release	= ocfs2_file_release,
2494	.open		= ocfs2_file_open,
2495	.read_iter	= ocfs2_file_read_iter,
2496	.write_iter	= ocfs2_file_write_iter,
2497	.unlocked_ioctl	= ocfs2_ioctl,
2498#ifdef CONFIG_COMPAT
2499	.compat_ioctl   = ocfs2_compat_ioctl,
2500#endif
2501	.lock		= ocfs2_lock,
2502	.flock		= ocfs2_flock,
2503	.splice_read	= generic_file_splice_read,
2504	.splice_write	= iter_file_splice_write,
2505	.fallocate	= ocfs2_fallocate,
2506	.clone_file_range = ocfs2_file_clone_range,
2507	.dedupe_file_range = ocfs2_file_dedupe_range,
2508};
2509
 
2510const struct file_operations ocfs2_dops = {
2511	.llseek		= generic_file_llseek,
2512	.read		= generic_read_dir,
2513	.iterate	= ocfs2_readdir,
2514	.fsync		= ocfs2_sync_file,
2515	.release	= ocfs2_dir_release,
2516	.open		= ocfs2_dir_open,
2517	.unlocked_ioctl	= ocfs2_ioctl,
2518#ifdef CONFIG_COMPAT
2519	.compat_ioctl   = ocfs2_compat_ioctl,
2520#endif
2521	.lock		= ocfs2_lock,
2522	.flock		= ocfs2_flock,
2523};
2524
2525/*
2526 * POSIX-lockless variants of our file_operations.
2527 *
2528 * These will be used if the underlying cluster stack does not support
2529 * posix file locking, if the user passes the "localflocks" mount
2530 * option, or if we have a local-only fs.
2531 *
2532 * ocfs2_flock is in here because all stacks handle UNIX file locks,
2533 * so we still want it in the case of no stack support for
2534 * plocks. Internally, it will do the right thing when asked to ignore
2535 * the cluster.
2536 */
2537const struct file_operations ocfs2_fops_no_plocks = {
2538	.llseek		= ocfs2_file_llseek,
2539	.mmap		= ocfs2_mmap,
2540	.fsync		= ocfs2_sync_file,
2541	.release	= ocfs2_file_release,
2542	.open		= ocfs2_file_open,
2543	.read_iter	= ocfs2_file_read_iter,
2544	.write_iter	= ocfs2_file_write_iter,
2545	.unlocked_ioctl	= ocfs2_ioctl,
2546#ifdef CONFIG_COMPAT
2547	.compat_ioctl   = ocfs2_compat_ioctl,
2548#endif
2549	.flock		= ocfs2_flock,
2550	.splice_read	= generic_file_splice_read,
2551	.splice_write	= iter_file_splice_write,
2552	.fallocate	= ocfs2_fallocate,
2553	.clone_file_range = ocfs2_file_clone_range,
2554	.dedupe_file_range = ocfs2_file_dedupe_range,
2555};
2556
2557const struct file_operations ocfs2_dops_no_plocks = {
2558	.llseek		= generic_file_llseek,
2559	.read		= generic_read_dir,
2560	.iterate	= ocfs2_readdir,
2561	.fsync		= ocfs2_sync_file,
2562	.release	= ocfs2_dir_release,
2563	.open		= ocfs2_dir_open,
2564	.unlocked_ioctl	= ocfs2_ioctl,
2565#ifdef CONFIG_COMPAT
2566	.compat_ioctl   = ocfs2_compat_ioctl,
2567#endif
2568	.flock		= ocfs2_flock,
2569};