file.c 53.3 KB
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/* -*- mode: c; c-basic-offset: 8; -*-
 * vim: noexpandtab sw=8 ts=8 sts=0:
 *
 * file.c
 *
 * File open, close, extend, truncate
 *
 * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 021110-1307, USA.
 */

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#include <linux/capability.h>
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#include <linux/fs.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/highmem.h>
#include <linux/pagemap.h>
#include <linux/uio.h>
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#include <linux/sched.h>
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#include <linux/splice.h>
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#include <linux/mount.h>
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#include <linux/writeback.h>
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#include <linux/falloc.h>
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#include <linux/quotaops.h>
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#define MLOG_MASK_PREFIX ML_INODE
#include <cluster/masklog.h>

#include "ocfs2.h"

#include "alloc.h"
#include "aops.h"
#include "dir.h"
#include "dlmglue.h"
#include "extent_map.h"
#include "file.h"
#include "sysfile.h"
#include "inode.h"
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#include "ioctl.h"
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#include "journal.h"
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#include "locks.h"
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#include "mmap.h"
#include "suballoc.h"
#include "super.h"
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#include "xattr.h"
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#include "acl.h"
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#include "quota.h"
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#include "buffer_head_io.h"

static int ocfs2_sync_inode(struct inode *inode)
{
	filemap_fdatawrite(inode->i_mapping);
	return sync_mapping_buffers(inode->i_mapping);
}

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static int ocfs2_init_file_private(struct inode *inode, struct file *file)
{
	struct ocfs2_file_private *fp;

	fp = kzalloc(sizeof(struct ocfs2_file_private), GFP_KERNEL);
	if (!fp)
		return -ENOMEM;

	fp->fp_file = file;
	mutex_init(&fp->fp_mutex);
	ocfs2_file_lock_res_init(&fp->fp_flock, fp);
	file->private_data = fp;

	return 0;
}

static void ocfs2_free_file_private(struct inode *inode, struct file *file)
{
	struct ocfs2_file_private *fp = file->private_data;
	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);

	if (fp) {
		ocfs2_simple_drop_lockres(osb, &fp->fp_flock);
		ocfs2_lock_res_free(&fp->fp_flock);
		kfree(fp);
		file->private_data = NULL;
	}
}

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static int ocfs2_file_open(struct inode *inode, struct file *file)
{
	int status;
	int mode = file->f_flags;
	struct ocfs2_inode_info *oi = OCFS2_I(inode);

	mlog_entry("(0x%p, 0x%p, '%.*s')\n", inode, file,
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		   file->f_path.dentry->d_name.len, file->f_path.dentry->d_name.name);
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	spin_lock(&oi->ip_lock);

	/* Check that the inode hasn't been wiped from disk by another
	 * node. If it hasn't then we're safe as long as we hold the
	 * spin lock until our increment of open count. */
	if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_DELETED) {
		spin_unlock(&oi->ip_lock);

		status = -ENOENT;
		goto leave;
	}

	if (mode & O_DIRECT)
		oi->ip_flags |= OCFS2_INODE_OPEN_DIRECT;

	oi->ip_open_count++;
	spin_unlock(&oi->ip_lock);
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	status = ocfs2_init_file_private(inode, file);
	if (status) {
		/*
		 * We want to set open count back if we're failing the
		 * open.
		 */
		spin_lock(&oi->ip_lock);
		oi->ip_open_count--;
		spin_unlock(&oi->ip_lock);
	}

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leave:
	mlog_exit(status);
	return status;
}

static int ocfs2_file_release(struct inode *inode, struct file *file)
{
	struct ocfs2_inode_info *oi = OCFS2_I(inode);

	mlog_entry("(0x%p, 0x%p, '%.*s')\n", inode, file,
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		       file->f_path.dentry->d_name.len,
		       file->f_path.dentry->d_name.name);
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	spin_lock(&oi->ip_lock);
	if (!--oi->ip_open_count)
		oi->ip_flags &= ~OCFS2_INODE_OPEN_DIRECT;
	spin_unlock(&oi->ip_lock);

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	ocfs2_free_file_private(inode, file);

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	mlog_exit(0);

	return 0;
}

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static int ocfs2_dir_open(struct inode *inode, struct file *file)
{
	return ocfs2_init_file_private(inode, file);
}

static int ocfs2_dir_release(struct inode *inode, struct file *file)
{
	ocfs2_free_file_private(inode, file);
	return 0;
}

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static int ocfs2_sync_file(struct file *file,
			   struct dentry *dentry,
			   int datasync)
{
	int err = 0;
	journal_t *journal;
	struct inode *inode = dentry->d_inode;
	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);

	mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", file, dentry, datasync,
		   dentry->d_name.len, dentry->d_name.name);

	err = ocfs2_sync_inode(dentry->d_inode);
	if (err)
		goto bail;

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	if (datasync && !(inode->i_state & I_DIRTY_DATASYNC))
		goto bail;

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	journal = osb->journal->j_journal;
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	err = jbd2_journal_force_commit(journal);
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bail:
	mlog_exit(err);

	return (err < 0) ? -EIO : 0;
}

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int ocfs2_should_update_atime(struct inode *inode,
			      struct vfsmount *vfsmnt)
{
	struct timespec now;
	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);

	if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
		return 0;

	if ((inode->i_flags & S_NOATIME) ||
	    ((inode->i_sb->s_flags & MS_NODIRATIME) && S_ISDIR(inode->i_mode)))
		return 0;

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	/*
	 * We can be called with no vfsmnt structure - NFSD will
	 * sometimes do this.
	 *
	 * Note that our action here is different than touch_atime() -
	 * if we can't tell whether this is a noatime mount, then we
	 * don't know whether to trust the value of s_atime_quantum.
	 */
	if (vfsmnt == NULL)
		return 0;

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	if ((vfsmnt->mnt_flags & MNT_NOATIME) ||
	    ((vfsmnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
		return 0;

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	if (vfsmnt->mnt_flags & MNT_RELATIME) {
		if ((timespec_compare(&inode->i_atime, &inode->i_mtime) <= 0) ||
		    (timespec_compare(&inode->i_atime, &inode->i_ctime) <= 0))
			return 1;

		return 0;
	}

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	now = CURRENT_TIME;
	if ((now.tv_sec - inode->i_atime.tv_sec <= osb->s_atime_quantum))
		return 0;
	else
		return 1;
}

int ocfs2_update_inode_atime(struct inode *inode,
			     struct buffer_head *bh)
{
	int ret;
	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	handle_t *handle;
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	struct ocfs2_dinode *di = (struct ocfs2_dinode *) bh->b_data;
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	mlog_entry_void();

	handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
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	if (IS_ERR(handle)) {
		ret = PTR_ERR(handle);
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		mlog_errno(ret);
		goto out;
	}

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	ret = ocfs2_journal_access_di(handle, inode, bh,
				      OCFS2_JOURNAL_ACCESS_WRITE);
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	if (ret) {
		mlog_errno(ret);
		goto out_commit;
	}

	/*
	 * Don't use ocfs2_mark_inode_dirty() here as we don't always
	 * have i_mutex to guard against concurrent changes to other
	 * inode fields.
	 */
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	inode->i_atime = CURRENT_TIME;
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	di->i_atime = cpu_to_le64(inode->i_atime.tv_sec);
	di->i_atime_nsec = cpu_to_le32(inode->i_atime.tv_nsec);

	ret = ocfs2_journal_dirty(handle, bh);
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	if (ret < 0)
		mlog_errno(ret);

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out_commit:
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	ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
out:
	mlog_exit(ret);
	return ret;
}

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static int ocfs2_set_inode_size(handle_t *handle,
				struct inode *inode,
				struct buffer_head *fe_bh,
				u64 new_i_size)
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{
	int status;

	mlog_entry_void();
	i_size_write(inode, new_i_size);
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	inode->i_blocks = ocfs2_inode_sector_count(inode);
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	inode->i_ctime = inode->i_mtime = CURRENT_TIME;

	status = ocfs2_mark_inode_dirty(handle, inode, fe_bh);
	if (status < 0) {
		mlog_errno(status);
		goto bail;
	}

bail:
	mlog_exit(status);
	return status;
}

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int ocfs2_simple_size_update(struct inode *inode,
			     struct buffer_head *di_bh,
			     u64 new_i_size)
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{
	int ret;
	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
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	handle_t *handle = NULL;
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	handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
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	if (IS_ERR(handle)) {
		ret = PTR_ERR(handle);
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		mlog_errno(ret);
		goto out;
	}

	ret = ocfs2_set_inode_size(handle, inode, di_bh,
				   new_i_size);
	if (ret < 0)
		mlog_errno(ret);

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	ocfs2_commit_trans(osb, handle);
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out:
	return ret;
}

static int ocfs2_orphan_for_truncate(struct ocfs2_super *osb,
				     struct inode *inode,
				     struct buffer_head *fe_bh,
				     u64 new_i_size)
{
	int status;
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	handle_t *handle;
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	struct ocfs2_dinode *di;
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	u64 cluster_bytes;
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	mlog_entry_void();

	/* TODO: This needs to actually orphan the inode in this
	 * transaction. */

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	handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
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	if (IS_ERR(handle)) {
		status = PTR_ERR(handle);
		mlog_errno(status);
		goto out;
	}

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	status = ocfs2_journal_access_di(handle, inode, fe_bh,
					 OCFS2_JOURNAL_ACCESS_WRITE);
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	if (status < 0) {
		mlog_errno(status);
		goto out_commit;
	}

	/*
	 * Do this before setting i_size.
	 */
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	cluster_bytes = ocfs2_align_bytes_to_clusters(inode->i_sb, new_i_size);
	status = ocfs2_zero_range_for_truncate(inode, handle, new_i_size,
					       cluster_bytes);
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	if (status) {
		mlog_errno(status);
		goto out_commit;
	}

	i_size_write(inode, new_i_size);
	inode->i_ctime = inode->i_mtime = CURRENT_TIME;

	di = (struct ocfs2_dinode *) fe_bh->b_data;
	di->i_size = cpu_to_le64(new_i_size);
	di->i_ctime = di->i_mtime = cpu_to_le64(inode->i_ctime.tv_sec);
	di->i_ctime_nsec = di->i_mtime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);

	status = ocfs2_journal_dirty(handle, fe_bh);
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	if (status < 0)
		mlog_errno(status);

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out_commit:
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	ocfs2_commit_trans(osb, handle);
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out:
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	mlog_exit(status);
	return status;
}

static int ocfs2_truncate_file(struct inode *inode,
			       struct buffer_head *di_bh,
			       u64 new_i_size)
{
	int status = 0;
	struct ocfs2_dinode *fe = NULL;
	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	struct ocfs2_truncate_context *tc = NULL;

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	mlog_entry("(inode = %llu, new_i_size = %llu\n",
		   (unsigned long long)OCFS2_I(inode)->ip_blkno,
		   (unsigned long long)new_i_size);
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	/* We trust di_bh because it comes from ocfs2_inode_lock(), which
	 * already validated it */
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	fe = (struct ocfs2_dinode *) di_bh->b_data;

	mlog_bug_on_msg(le64_to_cpu(fe->i_size) != i_size_read(inode),
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			"Inode %llu, inode i_size = %lld != di "
			"i_size = %llu, i_flags = 0x%x\n",
			(unsigned long long)OCFS2_I(inode)->ip_blkno,
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			i_size_read(inode),
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			(unsigned long long)le64_to_cpu(fe->i_size),
			le32_to_cpu(fe->i_flags));
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	if (new_i_size > le64_to_cpu(fe->i_size)) {
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		mlog(0, "asked to truncate file with size (%llu) to size (%llu)!\n",
		     (unsigned long long)le64_to_cpu(fe->i_size),
		     (unsigned long long)new_i_size);
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		status = -EINVAL;
		mlog_errno(status);
		goto bail;
	}

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	mlog(0, "inode %llu, i_size = %llu, new_i_size = %llu\n",
	     (unsigned long long)le64_to_cpu(fe->i_blkno),
	     (unsigned long long)le64_to_cpu(fe->i_size),
	     (unsigned long long)new_i_size);
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	/* lets handle the simple truncate cases before doing any more
	 * cluster locking. */
	if (new_i_size == le64_to_cpu(fe->i_size))
		goto bail;

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	down_write(&OCFS2_I(inode)->ip_alloc_sem);

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	/*
	 * The inode lock forced other nodes to sync and drop their
	 * pages, which (correctly) happens even if we have a truncate
	 * without allocation change - ocfs2 cluster sizes can be much
	 * greater than page size, so we have to truncate them
	 * anyway.
	 */
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	unmap_mapping_range(inode->i_mapping, new_i_size + PAGE_SIZE - 1, 0, 1);
	truncate_inode_pages(inode->i_mapping, new_i_size);

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	if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
		status = ocfs2_truncate_inline(inode, di_bh, new_i_size,
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					       i_size_read(inode), 1);
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		if (status)
			mlog_errno(status);

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		goto bail_unlock_sem;
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	}

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	/* alright, we're going to need to do a full blown alloc size
	 * change. Orphan the inode so that recovery can complete the
	 * truncate if necessary. This does the task of marking
	 * i_size. */
	status = ocfs2_orphan_for_truncate(osb, inode, di_bh, new_i_size);
	if (status < 0) {
		mlog_errno(status);
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		goto bail_unlock_sem;
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	}

	status = ocfs2_prepare_truncate(osb, inode, di_bh, &tc);
	if (status < 0) {
		mlog_errno(status);
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		goto bail_unlock_sem;
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	}

	status = ocfs2_commit_truncate(osb, inode, di_bh, tc);
	if (status < 0) {
		mlog_errno(status);
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		goto bail_unlock_sem;
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	}

	/* TODO: orphan dir cleanup here. */
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bail_unlock_sem:
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	up_write(&OCFS2_I(inode)->ip_alloc_sem);

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bail:

	mlog_exit(status);
	return status;
}

/*
495
 * extend file allocation only here.
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 * we'll update all the disk stuff, and oip->alloc_size
 *
 * expect stuff to be locked, a transaction started and enough data /
 * metadata reservations in the contexts.
 *
 * Will return -EAGAIN, and a reason if a restart is needed.
 * If passed in, *reason will always be set, even in error.
 */
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int ocfs2_add_inode_data(struct ocfs2_super *osb,
			 struct inode *inode,
			 u32 *logical_offset,
			 u32 clusters_to_add,
			 int mark_unwritten,
			 struct buffer_head *fe_bh,
			 handle_t *handle,
			 struct ocfs2_alloc_context *data_ac,
			 struct ocfs2_alloc_context *meta_ac,
			 enum ocfs2_alloc_restarted *reason_ret)
514
{
515 516
	int ret;
	struct ocfs2_extent_tree et;
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518
	ocfs2_init_dinode_extent_tree(&et, inode, fe_bh);
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	ret = ocfs2_add_clusters_in_btree(osb, inode, logical_offset,
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					   clusters_to_add, mark_unwritten,
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					   &et, handle,
					   data_ac, meta_ac, reason_ret);

	return ret;
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}

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static int __ocfs2_extend_allocation(struct inode *inode, u32 logical_start,
				     u32 clusters_to_add, int mark_unwritten)
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{
	int status = 0;
	int restart_func = 0;
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	int credits;
533
	u32 prev_clusters;
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	struct buffer_head *bh = NULL;
	struct ocfs2_dinode *fe = NULL;
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	handle_t *handle = NULL;
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	struct ocfs2_alloc_context *data_ac = NULL;
	struct ocfs2_alloc_context *meta_ac = NULL;
	enum ocfs2_alloc_restarted why;
	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
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	struct ocfs2_extent_tree et;
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	int did_quota = 0;
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	mlog_entry("(clusters_to_add = %u)\n", clusters_to_add);

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	/*
	 * This function only exists for file systems which don't
	 * support holes.
	 */
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	BUG_ON(mark_unwritten && !ocfs2_sparse_alloc(osb));
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552
	status = ocfs2_read_inode_block(inode, &bh);
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	if (status < 0) {
		mlog_errno(status);
		goto leave;
	}
	fe = (struct ocfs2_dinode *) bh->b_data;

restart_all:
	BUG_ON(le32_to_cpu(fe->i_clusters) != OCFS2_I(inode)->ip_clusters);

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	mlog(0, "extend inode %llu, i_size = %lld, di->i_clusters = %u, "
	     "clusters_to_add = %u\n",
	     (unsigned long long)OCFS2_I(inode)->ip_blkno,
	     (long long)i_size_read(inode), le32_to_cpu(fe->i_clusters),
	     clusters_to_add);
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	ocfs2_init_dinode_extent_tree(&et, inode, bh);
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	status = ocfs2_lock_allocators(inode, &et, clusters_to_add, 0,
				       &data_ac, &meta_ac);
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	if (status) {
		mlog_errno(status);
		goto leave;
	}

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	credits = ocfs2_calc_extend_credits(osb->sb, &fe->id2.i_list,
					    clusters_to_add);
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	handle = ocfs2_start_trans(osb, credits);
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	if (IS_ERR(handle)) {
		status = PTR_ERR(handle);
		handle = NULL;
		mlog_errno(status);
		goto leave;
	}

restarted_transaction:
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	if (vfs_dq_alloc_space_nodirty(inode, ocfs2_clusters_to_bytes(osb->sb,
	    clusters_to_add))) {
		status = -EDQUOT;
		goto leave;
	}
	did_quota = 1;

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	/* reserve a write to the file entry early on - that we if we
	 * run out of credits in the allocation path, we can still
	 * update i_size. */
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	status = ocfs2_journal_access_di(handle, inode, bh,
					 OCFS2_JOURNAL_ACCESS_WRITE);
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	if (status < 0) {
		mlog_errno(status);
		goto leave;
	}

	prev_clusters = OCFS2_I(inode)->ip_clusters;

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	status = ocfs2_add_inode_data(osb,
				      inode,
				      &logical_start,
				      clusters_to_add,
				      mark_unwritten,
				      bh,
				      handle,
				      data_ac,
				      meta_ac,
				      &why);
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	if ((status < 0) && (status != -EAGAIN)) {
		if (status != -ENOSPC)
			mlog_errno(status);
		goto leave;
	}

	status = ocfs2_journal_dirty(handle, bh);
	if (status < 0) {
		mlog_errno(status);
		goto leave;
	}

	spin_lock(&OCFS2_I(inode)->ip_lock);
	clusters_to_add -= (OCFS2_I(inode)->ip_clusters - prev_clusters);
	spin_unlock(&OCFS2_I(inode)->ip_lock);
630 631 632 633
	/* Release unused quota reservation */
	vfs_dq_free_space(inode,
			ocfs2_clusters_to_bytes(osb->sb, clusters_to_add));
	did_quota = 0;
634 635 636 637 638 639 640 641 642 643 644

	if (why != RESTART_NONE && clusters_to_add) {
		if (why == RESTART_META) {
			mlog(0, "restarting function.\n");
			restart_func = 1;
		} else {
			BUG_ON(why != RESTART_TRANS);

			mlog(0, "restarting transaction.\n");
			/* TODO: This can be more intelligent. */
			credits = ocfs2_calc_extend_credits(osb->sb,
645
							    &fe->id2.i_list,
646
							    clusters_to_add);
647
			status = ocfs2_extend_trans(handle, credits);
648 649 650 651 652 653 654 655 656 657 658
			if (status < 0) {
				/* handle still has to be committed at
				 * this point. */
				status = -ENOMEM;
				mlog_errno(status);
				goto leave;
			}
			goto restarted_transaction;
		}
	}

659
	mlog(0, "fe: i_clusters = %u, i_size=%llu\n",
660 661
	     le32_to_cpu(fe->i_clusters),
	     (unsigned long long)le64_to_cpu(fe->i_size));
662
	mlog(0, "inode: ip_clusters=%u, i_size=%lld\n",
J
Jan Kara 已提交
663
	     OCFS2_I(inode)->ip_clusters, (long long)i_size_read(inode));
664 665

leave:
666 667 668
	if (status < 0 && did_quota)
		vfs_dq_free_space(inode,
			ocfs2_clusters_to_bytes(osb->sb, clusters_to_add));
669
	if (handle) {
670
		ocfs2_commit_trans(osb, handle);
671 672 673 674 675 676 677 678 679 680 681 682 683 684
		handle = NULL;
	}
	if (data_ac) {
		ocfs2_free_alloc_context(data_ac);
		data_ac = NULL;
	}
	if (meta_ac) {
		ocfs2_free_alloc_context(meta_ac);
		meta_ac = NULL;
	}
	if ((!status) && restart_func) {
		restart_func = 0;
		goto restart_all;
	}
685 686
	brelse(bh);
	bh = NULL;
687 688 689 690 691 692 693

	mlog_exit(status);
	return status;
}

/* Some parts of this taken from generic_cont_expand, which turned out
 * to be too fragile to do exactly what we need without us having to
694
 * worry about recursive locking in ->write_begin() and ->write_end(). */
695 696 697 698 699 700 701
static int ocfs2_write_zero_page(struct inode *inode,
				 u64 size)
{
	struct address_space *mapping = inode->i_mapping;
	struct page *page;
	unsigned long index;
	unsigned int offset;
702
	handle_t *handle = NULL;
703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721
	int ret;

	offset = (size & (PAGE_CACHE_SIZE-1)); /* Within page */
	/* ugh.  in prepare/commit_write, if from==to==start of block, we 
	** skip the prepare.  make sure we never send an offset for the start
	** of a block
	*/
	if ((offset & (inode->i_sb->s_blocksize - 1)) == 0) {
		offset++;
	}
	index = size >> PAGE_CACHE_SHIFT;

	page = grab_cache_page(mapping, index);
	if (!page) {
		ret = -ENOMEM;
		mlog_errno(ret);
		goto out;
	}

722
	ret = ocfs2_prepare_write_nolock(inode, page, offset, offset);
723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745
	if (ret < 0) {
		mlog_errno(ret);
		goto out_unlock;
	}

	if (ocfs2_should_order_data(inode)) {
		handle = ocfs2_start_walk_page_trans(inode, page, offset,
						     offset);
		if (IS_ERR(handle)) {
			ret = PTR_ERR(handle);
			handle = NULL;
			goto out_unlock;
		}
	}

	/* must not update i_size! */
	ret = block_commit_write(page, offset, offset);
	if (ret < 0)
		mlog_errno(ret);
	else
		ret = 0;

	if (handle)
746
		ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769
out_unlock:
	unlock_page(page);
	page_cache_release(page);
out:
	return ret;
}

static int ocfs2_zero_extend(struct inode *inode,
			     u64 zero_to_size)
{
	int ret = 0;
	u64 start_off;
	struct super_block *sb = inode->i_sb;

	start_off = ocfs2_align_bytes_to_blocks(sb, i_size_read(inode));
	while (start_off < zero_to_size) {
		ret = ocfs2_write_zero_page(inode, start_off);
		if (ret < 0) {
			mlog_errno(ret);
			goto out;
		}

		start_off += sb->s_blocksize;
770 771 772 773 774 775

		/*
		 * Very large extends have the potential to lock up
		 * the cpu for extended periods of time.
		 */
		cond_resched();
776 777 778 779 780 781
	}

out:
	return ret;
}

782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815
int ocfs2_extend_no_holes(struct inode *inode, u64 new_i_size, u64 zero_to)
{
	int ret;
	u32 clusters_to_add;
	struct ocfs2_inode_info *oi = OCFS2_I(inode);

	clusters_to_add = ocfs2_clusters_for_bytes(inode->i_sb, new_i_size);
	if (clusters_to_add < oi->ip_clusters)
		clusters_to_add = 0;
	else
		clusters_to_add -= oi->ip_clusters;

	if (clusters_to_add) {
		ret = __ocfs2_extend_allocation(inode, oi->ip_clusters,
						clusters_to_add, 0);
		if (ret) {
			mlog_errno(ret);
			goto out;
		}
	}

	/*
	 * Call this even if we don't add any clusters to the tree. We
	 * still need to zero the area between the old i_size and the
	 * new i_size.
	 */
	ret = ocfs2_zero_extend(inode, zero_to);
	if (ret < 0)
		mlog_errno(ret);

out:
	return ret;
}

816 817
static int ocfs2_extend_file(struct inode *inode,
			     struct buffer_head *di_bh,
818
			     u64 new_i_size)
819
{
M
Mark Fasheh 已提交
820
	int ret = 0;
M
Mark Fasheh 已提交
821
	struct ocfs2_inode_info *oi = OCFS2_I(inode);
822

823
	BUG_ON(!di_bh);
824

825 826 827 828 829 830 831 832
	/* setattr sometimes calls us like this. */
	if (new_i_size == 0)
		goto out;

	if (i_size_read(inode) == new_i_size)
  		goto out;
	BUG_ON(new_i_size < i_size_read(inode));

M
Mark Fasheh 已提交
833 834 835 836 837 838 839 840 841 842 843
	/*
	 * Fall through for converting inline data, even if the fs
	 * supports sparse files.
	 *
	 * The check for inline data here is legal - nobody can add
	 * the feature since we have i_mutex. We must check it again
	 * after acquiring ip_alloc_sem though, as paths like mmap
	 * might have raced us to converting the inode to extents.
	 */
	if (!(oi->ip_dyn_features & OCFS2_INLINE_DATA_FL)
	    && ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)))
844
		goto out_update_size;
845

846
	/*
847 848 849 850
	 * The alloc sem blocks people in read/write from reading our
	 * allocation until we're done changing it. We depend on
	 * i_mutex to block other extend/truncate calls while we're
	 * here.
851
	 */
M
Mark Fasheh 已提交
852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868
	down_write(&oi->ip_alloc_sem);

	if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
		/*
		 * We can optimize small extends by keeping the inodes
		 * inline data.
		 */
		if (ocfs2_size_fits_inline_data(di_bh, new_i_size)) {
			up_write(&oi->ip_alloc_sem);
			goto out_update_size;
		}

		ret = ocfs2_convert_inline_data_to_extents(inode, di_bh);
		if (ret) {
			up_write(&oi->ip_alloc_sem);

			mlog_errno(ret);
M
Mark Fasheh 已提交
869
			goto out;
M
Mark Fasheh 已提交
870 871 872 873 874 875 876
		}
	}

	if (!ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)))
		ret = ocfs2_extend_no_holes(inode, new_i_size, new_i_size);

	up_write(&oi->ip_alloc_sem);
877

878 879
	if (ret < 0) {
		mlog_errno(ret);
M
Mark Fasheh 已提交
880
		goto out;
881 882
	}

883
out_update_size:
884 885 886
	ret = ocfs2_simple_size_update(inode, di_bh, new_i_size);
	if (ret < 0)
		mlog_errno(ret);
887 888 889 890 891 892 893 894 895 896 897 898

out:
	return ret;
}

int ocfs2_setattr(struct dentry *dentry, struct iattr *attr)
{
	int status = 0, size_change;
	struct inode *inode = dentry->d_inode;
	struct super_block *sb = inode->i_sb;
	struct ocfs2_super *osb = OCFS2_SB(sb);
	struct buffer_head *bh = NULL;
899
	handle_t *handle = NULL;
900 901 902
	int qtype;
	struct dquot *transfer_from[MAXQUOTAS] = { };
	struct dquot *transfer_to[MAXQUOTAS] = { };
903 904 905 906

	mlog_entry("(0x%p, '%.*s')\n", dentry,
	           dentry->d_name.len, dentry->d_name.name);

907 908 909 910
	/* ensuring we don't even attempt to truncate a symlink */
	if (S_ISLNK(inode->i_mode))
		attr->ia_valid &= ~ATTR_SIZE;

911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941
	if (attr->ia_valid & ATTR_MODE)
		mlog(0, "mode change: %d\n", attr->ia_mode);
	if (attr->ia_valid & ATTR_UID)
		mlog(0, "uid change: %d\n", attr->ia_uid);
	if (attr->ia_valid & ATTR_GID)
		mlog(0, "gid change: %d\n", attr->ia_gid);
	if (attr->ia_valid & ATTR_SIZE)
		mlog(0, "size change...\n");
	if (attr->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_CTIME))
		mlog(0, "time change...\n");

#define OCFS2_VALID_ATTRS (ATTR_ATIME | ATTR_MTIME | ATTR_CTIME | ATTR_SIZE \
			   | ATTR_GID | ATTR_UID | ATTR_MODE)
	if (!(attr->ia_valid & OCFS2_VALID_ATTRS)) {
		mlog(0, "can't handle attrs: 0x%x\n", attr->ia_valid);
		return 0;
	}

	status = inode_change_ok(inode, attr);
	if (status)
		return status;

	size_change = S_ISREG(inode->i_mode) && attr->ia_valid & ATTR_SIZE;
	if (size_change) {
		status = ocfs2_rw_lock(inode, 1);
		if (status < 0) {
			mlog_errno(status);
			goto bail;
		}
	}

M
Mark Fasheh 已提交
942
	status = ocfs2_inode_lock(inode, &bh, 1);
943 944 945 946 947 948 949
	if (status < 0) {
		if (status != -ENOENT)
			mlog_errno(status);
		goto bail_unlock_rw;
	}

	if (size_change && attr->ia_size != i_size_read(inode)) {
950 951 952 953 954
		if (attr->ia_size > sb->s_maxbytes) {
			status = -EFBIG;
			goto bail_unlock;
		}

J
Joel Becker 已提交
955 956 957 958 959 960 961
		if (i_size_read(inode) > attr->ia_size) {
			if (ocfs2_should_order_data(inode)) {
				status = ocfs2_begin_ordered_truncate(inode,
								      attr->ia_size);
				if (status)
					goto bail_unlock;
			}
962
			status = ocfs2_truncate_file(inode, bh, attr->ia_size);
J
Joel Becker 已提交
963
		} else
964
			status = ocfs2_extend_file(inode, bh, attr->ia_size);
965 966 967 968 969 970 971 972
		if (status < 0) {
			if (status != -ENOSPC)
				mlog_errno(status);
			status = -ENOSPC;
			goto bail_unlock;
		}
	}

973 974
	if ((attr->ia_valid & ATTR_UID && attr->ia_uid != inode->i_uid) ||
	    (attr->ia_valid & ATTR_GID && attr->ia_gid != inode->i_gid)) {
975 976 977 978 979
		/*
		 * Gather pointers to quota structures so that allocation /
		 * freeing of quota structures happens here and not inside
		 * vfs_dq_transfer() where we have problems with lock ordering
		 */
980 981 982
		if (attr->ia_valid & ATTR_UID && attr->ia_uid != inode->i_uid
		    && OCFS2_HAS_RO_COMPAT_FEATURE(sb,
		    OCFS2_FEATURE_RO_COMPAT_USRQUOTA)) {
983 984 985 986 987 988
			transfer_to[USRQUOTA] = dqget(sb, attr->ia_uid,
						      USRQUOTA);
			transfer_from[USRQUOTA] = dqget(sb, inode->i_uid,
							USRQUOTA);
			if (!transfer_to[USRQUOTA] || !transfer_from[USRQUOTA]) {
				status = -ESRCH;
989
				goto bail_unlock;
990
			}
991 992 993 994
		}
		if (attr->ia_valid & ATTR_GID && attr->ia_gid != inode->i_gid
		    && OCFS2_HAS_RO_COMPAT_FEATURE(sb,
		    OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)) {
995 996 997 998 999 1000
			transfer_to[GRPQUOTA] = dqget(sb, attr->ia_gid,
						      GRPQUOTA);
			transfer_from[GRPQUOTA] = dqget(sb, inode->i_gid,
							GRPQUOTA);
			if (!transfer_to[GRPQUOTA] || !transfer_from[GRPQUOTA]) {
				status = -ESRCH;
1001
				goto bail_unlock;
1002
			}
1003
		}
1004 1005
		handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS +
					   2 * ocfs2_quota_trans_credits(sb));
1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020
		if (IS_ERR(handle)) {
			status = PTR_ERR(handle);
			mlog_errno(status);
			goto bail_unlock;
		}
		status = vfs_dq_transfer(inode, attr) ? -EDQUOT : 0;
		if (status < 0)
			goto bail_commit;
	} else {
		handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
		if (IS_ERR(handle)) {
			status = PTR_ERR(handle);
			mlog_errno(status);
			goto bail_unlock;
		}
1021 1022
	}

M
Mark Fasheh 已提交
1023 1024 1025 1026 1027 1028 1029
	/*
	 * This will intentionally not wind up calling vmtruncate(),
	 * since all the work for a size change has been done above.
	 * Otherwise, we could get into problems with truncate as
	 * ip_alloc_sem is used there to protect against i_size
	 * changes.
	 */
1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040
	status = inode_setattr(inode, attr);
	if (status < 0) {
		mlog_errno(status);
		goto bail_commit;
	}

	status = ocfs2_mark_inode_dirty(handle, inode, bh);
	if (status < 0)
		mlog_errno(status);

bail_commit:
1041
	ocfs2_commit_trans(osb, handle);
1042
bail_unlock:
M
Mark Fasheh 已提交
1043
	ocfs2_inode_unlock(inode, 1);
1044 1045 1046 1047
bail_unlock_rw:
	if (size_change)
		ocfs2_rw_unlock(inode, 1);
bail:
1048
	brelse(bh);
1049

1050 1051 1052 1053 1054 1055
	/* Release quota pointers in case we acquired them */
	for (qtype = 0; qtype < MAXQUOTAS; qtype++) {
		dqput(transfer_to[qtype]);
		dqput(transfer_from[qtype]);
	}

T
Tiger Yang 已提交
1056 1057 1058 1059 1060 1061
	if (!status && attr->ia_valid & ATTR_MODE) {
		status = ocfs2_acl_chmod(inode);
		if (status < 0)
			mlog_errno(status);
	}

1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094
	mlog_exit(status);
	return status;
}

int ocfs2_getattr(struct vfsmount *mnt,
		  struct dentry *dentry,
		  struct kstat *stat)
{
	struct inode *inode = dentry->d_inode;
	struct super_block *sb = dentry->d_inode->i_sb;
	struct ocfs2_super *osb = sb->s_fs_info;
	int err;

	mlog_entry_void();

	err = ocfs2_inode_revalidate(dentry);
	if (err) {
		if (err != -ENOENT)
			mlog_errno(err);
		goto bail;
	}

	generic_fillattr(inode, stat);

	/* We set the blksize from the cluster size for performance */
	stat->blksize = osb->s_clustersize;

bail:
	mlog_exit(err);

	return err;
}

1095
int ocfs2_permission(struct inode *inode, int mask)
T
Tiger Yang 已提交
1096 1097 1098 1099 1100
{
	int ret;

	mlog_entry_void();

M
Mark Fasheh 已提交
1101
	ret = ocfs2_inode_lock(inode, NULL, 0);
T
Tiger Yang 已提交
1102
	if (ret) {
M
Mark Fasheh 已提交
1103 1104
		if (ret != -ENOENT)
			mlog_errno(ret);
T
Tiger Yang 已提交
1105 1106 1107
		goto out;
	}

T
Tiger Yang 已提交
1108
	ret = generic_permission(inode, mask, ocfs2_check_acl);
T
Tiger Yang 已提交
1109

M
Mark Fasheh 已提交
1110
	ocfs2_inode_unlock(inode, 0);
T
Tiger Yang 已提交
1111 1112 1113 1114 1115
out:
	mlog_exit(ret);
	return ret;
}

1116 1117
static int __ocfs2_write_remove_suid(struct inode *inode,
				     struct buffer_head *bh)
1118 1119
{
	int ret;
1120
	handle_t *handle;
1121 1122 1123
	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	struct ocfs2_dinode *di;

1124
	mlog_entry("(Inode %llu, mode 0%o)\n",
1125
		   (unsigned long long)OCFS2_I(inode)->ip_blkno, inode->i_mode);
1126

1127
	handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1128 1129
	if (IS_ERR(handle)) {
		ret = PTR_ERR(handle);
1130 1131 1132 1133
		mlog_errno(ret);
		goto out;
	}

1134 1135
	ret = ocfs2_journal_access_di(handle, inode, bh,
				      OCFS2_JOURNAL_ACCESS_WRITE);
1136 1137
	if (ret < 0) {
		mlog_errno(ret);
1138
		goto out_trans;
1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150
	}

	inode->i_mode &= ~S_ISUID;
	if ((inode->i_mode & S_ISGID) && (inode->i_mode & S_IXGRP))
		inode->i_mode &= ~S_ISGID;

	di = (struct ocfs2_dinode *) bh->b_data;
	di->i_mode = cpu_to_le16(inode->i_mode);

	ret = ocfs2_journal_dirty(handle, bh);
	if (ret < 0)
		mlog_errno(ret);
1151

1152
out_trans:
1153
	ocfs2_commit_trans(osb, handle);
1154 1155 1156 1157 1158
out:
	mlog_exit(ret);
	return ret;
}

1159 1160 1161 1162 1163 1164 1165 1166
/*
 * Will look for holes and unwritten extents in the range starting at
 * pos for count bytes (inclusive).
 */
static int ocfs2_check_range_for_holes(struct inode *inode, loff_t pos,
				       size_t count)
{
	int ret = 0;
1167
	unsigned int extent_flags;
1168 1169 1170 1171 1172 1173 1174
	u32 cpos, clusters, extent_len, phys_cpos;
	struct super_block *sb = inode->i_sb;

	cpos = pos >> OCFS2_SB(sb)->s_clustersize_bits;
	clusters = ocfs2_clusters_for_bytes(sb, pos + count) - cpos;

	while (clusters) {
1175 1176
		ret = ocfs2_get_clusters(inode, cpos, &phys_cpos, &extent_len,
					 &extent_flags);
1177 1178 1179 1180 1181
		if (ret < 0) {
			mlog_errno(ret);
			goto out;
		}

1182
		if (phys_cpos == 0 || (extent_flags & OCFS2_EXT_UNWRITTEN)) {
1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196
			ret = 1;
			break;
		}

		if (extent_len > clusters)
			extent_len = clusters;

		clusters -= extent_len;
		cpos += extent_len;
	}
out:
	return ret;
}

1197 1198 1199 1200 1201
static int ocfs2_write_remove_suid(struct inode *inode)
{
	int ret;
	struct buffer_head *bh = NULL;

1202
	ret = ocfs2_read_inode_block(inode, &bh);
1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213
	if (ret < 0) {
		mlog_errno(ret);
		goto out;
	}

	ret =  __ocfs2_write_remove_suid(inode, bh);
out:
	brelse(bh);
	return ret;
}

1214 1215 1216 1217 1218 1219 1220 1221 1222 1223
/*
 * Allocate enough extents to cover the region starting at byte offset
 * start for len bytes. Existing extents are skipped, any extents
 * added are marked as "unwritten".
 */
static int ocfs2_allocate_unwritten_extents(struct inode *inode,
					    u64 start, u64 len)
{
	int ret;
	u32 cpos, phys_cpos, clusters, alloc_size;
M
Mark Fasheh 已提交
1224 1225 1226 1227
	u64 end = start + len;
	struct buffer_head *di_bh = NULL;

	if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1228
		ret = ocfs2_read_inode_block(inode, &di_bh);
M
Mark Fasheh 已提交
1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246
		if (ret) {
			mlog_errno(ret);
			goto out;
		}

		/*
		 * Nothing to do if the requested reservation range
		 * fits within the inode.
		 */
		if (ocfs2_size_fits_inline_data(di_bh, end))
			goto out;

		ret = ocfs2_convert_inline_data_to_extents(inode, di_bh);
		if (ret) {
			mlog_errno(ret);
			goto out;
		}
	}
1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291

	/*
	 * We consider both start and len to be inclusive.
	 */
	cpos = start >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
	clusters = ocfs2_clusters_for_bytes(inode->i_sb, start + len);
	clusters -= cpos;

	while (clusters) {
		ret = ocfs2_get_clusters(inode, cpos, &phys_cpos,
					 &alloc_size, NULL);
		if (ret) {
			mlog_errno(ret);
			goto out;
		}

		/*
		 * Hole or existing extent len can be arbitrary, so
		 * cap it to our own allocation request.
		 */
		if (alloc_size > clusters)
			alloc_size = clusters;

		if (phys_cpos) {
			/*
			 * We already have an allocation at this
			 * region so we can safely skip it.
			 */
			goto next;
		}

		ret = __ocfs2_extend_allocation(inode, cpos, alloc_size, 1);
		if (ret) {
			if (ret != -ENOSPC)
				mlog_errno(ret);
			goto out;
		}

next:
		cpos += alloc_size;
		clusters -= alloc_size;
	}

	ret = 0;
out:
M
Mark Fasheh 已提交
1292 1293

	brelse(di_bh);
1294 1295 1296
	return ret;
}

1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345
/*
 * Truncate a byte range, avoiding pages within partial clusters. This
 * preserves those pages for the zeroing code to write to.
 */
static void ocfs2_truncate_cluster_pages(struct inode *inode, u64 byte_start,
					 u64 byte_len)
{
	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	loff_t start, end;
	struct address_space *mapping = inode->i_mapping;

	start = (loff_t)ocfs2_align_bytes_to_clusters(inode->i_sb, byte_start);
	end = byte_start + byte_len;
	end = end & ~(osb->s_clustersize - 1);

	if (start < end) {
		unmap_mapping_range(mapping, start, end - start, 0);
		truncate_inode_pages_range(mapping, start, end - 1);
	}
}

static int ocfs2_zero_partial_clusters(struct inode *inode,
				       u64 start, u64 len)
{
	int ret = 0;
	u64 tmpend, end = start + len;
	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	unsigned int csize = osb->s_clustersize;
	handle_t *handle;

	/*
	 * The "start" and "end" values are NOT necessarily part of
	 * the range whose allocation is being deleted. Rather, this
	 * is what the user passed in with the request. We must zero
	 * partial clusters here. There's no need to worry about
	 * physical allocation - the zeroing code knows to skip holes.
	 */
	mlog(0, "byte start: %llu, end: %llu\n",
	     (unsigned long long)start, (unsigned long long)end);

	/*
	 * If both edges are on a cluster boundary then there's no
	 * zeroing required as the region is part of the allocation to
	 * be truncated.
	 */
	if ((start & (csize - 1)) == 0 && (end & (csize - 1)) == 0)
		goto out;

	handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1346 1347
	if (IS_ERR(handle)) {
		ret = PTR_ERR(handle);
1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394
		mlog_errno(ret);
		goto out;
	}

	/*
	 * We want to get the byte offset of the end of the 1st cluster.
	 */
	tmpend = (u64)osb->s_clustersize + (start & ~(osb->s_clustersize - 1));
	if (tmpend > end)
		tmpend = end;

	mlog(0, "1st range: start: %llu, tmpend: %llu\n",
	     (unsigned long long)start, (unsigned long long)tmpend);

	ret = ocfs2_zero_range_for_truncate(inode, handle, start, tmpend);
	if (ret)
		mlog_errno(ret);

	if (tmpend < end) {
		/*
		 * This may make start and end equal, but the zeroing
		 * code will skip any work in that case so there's no
		 * need to catch it up here.
		 */
		start = end & ~(osb->s_clustersize - 1);

		mlog(0, "2nd range: start: %llu, end: %llu\n",
		     (unsigned long long)start, (unsigned long long)end);

		ret = ocfs2_zero_range_for_truncate(inode, handle, start, end);
		if (ret)
			mlog_errno(ret);
	}

	ocfs2_commit_trans(osb, handle);
out:
	return ret;
}

static int ocfs2_remove_inode_range(struct inode *inode,
				    struct buffer_head *di_bh, u64 byte_start,
				    u64 byte_len)
{
	int ret = 0;
	u32 trunc_start, trunc_len, cpos, phys_cpos, alloc_size;
	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	struct ocfs2_cached_dealloc_ctxt dealloc;
1395
	struct address_space *mapping = inode->i_mapping;
1396
	struct ocfs2_extent_tree et;
1397

1398
	ocfs2_init_dinode_extent_tree(&et, inode, di_bh);
1399 1400 1401 1402 1403
	ocfs2_init_dealloc_ctxt(&dealloc);

	if (byte_len == 0)
		return 0;

M
Mark Fasheh 已提交
1404 1405
	if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
		ret = ocfs2_truncate_inline(inode, di_bh, byte_start,
1406 1407
					    byte_start + byte_len, 0);
		if (ret) {
M
Mark Fasheh 已提交
1408
			mlog_errno(ret);
1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419
			goto out;
		}
		/*
		 * There's no need to get fancy with the page cache
		 * truncate of an inline-data inode. We're talking
		 * about less than a page here, which will be cached
		 * in the dinode buffer anyway.
		 */
		unmap_mapping_range(mapping, 0, 0, 0);
		truncate_inode_pages(mapping, 0);
		goto out;
M
Mark Fasheh 已提交
1420 1421
	}

1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453
	trunc_start = ocfs2_clusters_for_bytes(osb->sb, byte_start);
	trunc_len = (byte_start + byte_len) >> osb->s_clustersize_bits;
	if (trunc_len >= trunc_start)
		trunc_len -= trunc_start;
	else
		trunc_len = 0;

	mlog(0, "Inode: %llu, start: %llu, len: %llu, cstart: %u, clen: %u\n",
	     (unsigned long long)OCFS2_I(inode)->ip_blkno,
	     (unsigned long long)byte_start,
	     (unsigned long long)byte_len, trunc_start, trunc_len);

	ret = ocfs2_zero_partial_clusters(inode, byte_start, byte_len);
	if (ret) {
		mlog_errno(ret);
		goto out;
	}

	cpos = trunc_start;
	while (trunc_len) {
		ret = ocfs2_get_clusters(inode, cpos, &phys_cpos,
					 &alloc_size, NULL);
		if (ret) {
			mlog_errno(ret);
			goto out;
		}

		if (alloc_size > trunc_len)
			alloc_size = trunc_len;

		/* Only do work for non-holes */
		if (phys_cpos != 0) {
1454 1455 1456
			ret = ocfs2_remove_btree_range(inode, &et, cpos,
						       phys_cpos, alloc_size,
						       &dealloc);
1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475
			if (ret) {
				mlog_errno(ret);
				goto out;
			}
		}

		cpos += alloc_size;
		trunc_len -= alloc_size;
	}

	ocfs2_truncate_cluster_pages(inode, byte_start, byte_len);

out:
	ocfs2_schedule_truncate_log_flush(osb, 1);
	ocfs2_run_deallocs(osb, &dealloc);

	return ret;
}

1476 1477 1478
/*
 * Parts of this function taken from xfs_change_file_space()
 */
M
Mark Fasheh 已提交
1479 1480 1481 1482
static int __ocfs2_change_file_space(struct file *file, struct inode *inode,
				     loff_t f_pos, unsigned int cmd,
				     struct ocfs2_space_resv *sr,
				     int change_size)
1483 1484 1485
{
	int ret;
	s64 llen;
M
Mark Fasheh 已提交
1486
	loff_t size;
1487 1488 1489
	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	struct buffer_head *di_bh = NULL;
	handle_t *handle;
1490
	unsigned long long max_off = inode->i_sb->s_maxbytes;
1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505

	if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
		return -EROFS;

	mutex_lock(&inode->i_mutex);

	/*
	 * This prevents concurrent writes on other nodes
	 */
	ret = ocfs2_rw_lock(inode, 1);
	if (ret) {
		mlog_errno(ret);
		goto out;
	}

M
Mark Fasheh 已提交
1506
	ret = ocfs2_inode_lock(inode, &di_bh, 1);
1507 1508 1509 1510 1511 1512 1513
	if (ret) {
		mlog_errno(ret);
		goto out_rw_unlock;
	}

	if (inode->i_flags & (S_IMMUTABLE|S_APPEND)) {
		ret = -EPERM;
M
Mark Fasheh 已提交
1514
		goto out_inode_unlock;
1515 1516 1517 1518 1519 1520
	}

	switch (sr->l_whence) {
	case 0: /*SEEK_SET*/
		break;
	case 1: /*SEEK_CUR*/
M
Mark Fasheh 已提交
1521
		sr->l_start += f_pos;
1522 1523 1524 1525 1526 1527
		break;
	case 2: /*SEEK_END*/
		sr->l_start += i_size_read(inode);
		break;
	default:
		ret = -EINVAL;
M
Mark Fasheh 已提交
1528
		goto out_inode_unlock;
1529 1530 1531 1532 1533 1534 1535 1536 1537 1538
	}
	sr->l_whence = 0;

	llen = sr->l_len > 0 ? sr->l_len - 1 : sr->l_len;

	if (sr->l_start < 0
	    || sr->l_start > max_off
	    || (sr->l_start + llen) < 0
	    || (sr->l_start + llen) > max_off) {
		ret = -EINVAL;
M
Mark Fasheh 已提交
1539
		goto out_inode_unlock;
1540
	}
M
Mark Fasheh 已提交
1541
	size = sr->l_start + sr->l_len;
1542 1543 1544 1545

	if (cmd == OCFS2_IOC_RESVSP || cmd == OCFS2_IOC_RESVSP64) {
		if (sr->l_len <= 0) {
			ret = -EINVAL;
M
Mark Fasheh 已提交
1546
			goto out_inode_unlock;
1547 1548 1549
		}
	}

M
Mark Fasheh 已提交
1550
	if (file && should_remove_suid(file->f_path.dentry)) {
1551 1552 1553
		ret = __ocfs2_write_remove_suid(inode, di_bh);
		if (ret) {
			mlog_errno(ret);
M
Mark Fasheh 已提交
1554
			goto out_inode_unlock;
1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579
		}
	}

	down_write(&OCFS2_I(inode)->ip_alloc_sem);
	switch (cmd) {
	case OCFS2_IOC_RESVSP:
	case OCFS2_IOC_RESVSP64:
		/*
		 * This takes unsigned offsets, but the signed ones we
		 * pass have been checked against overflow above.
		 */
		ret = ocfs2_allocate_unwritten_extents(inode, sr->l_start,
						       sr->l_len);
		break;
	case OCFS2_IOC_UNRESVSP:
	case OCFS2_IOC_UNRESVSP64:
		ret = ocfs2_remove_inode_range(inode, di_bh, sr->l_start,
					       sr->l_len);
		break;
	default:
		ret = -EINVAL;
	}
	up_write(&OCFS2_I(inode)->ip_alloc_sem);
	if (ret) {
		mlog_errno(ret);
M
Mark Fasheh 已提交
1580
		goto out_inode_unlock;
1581 1582 1583 1584 1585 1586 1587 1588 1589
	}

	/*
	 * We update c/mtime for these changes
	 */
	handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
	if (IS_ERR(handle)) {
		ret = PTR_ERR(handle);
		mlog_errno(ret);
M
Mark Fasheh 已提交
1590
		goto out_inode_unlock;
1591 1592
	}

M
Mark Fasheh 已提交
1593 1594 1595
	if (change_size && i_size_read(inode) < size)
		i_size_write(inode, size);

1596 1597 1598 1599 1600 1601 1602
	inode->i_ctime = inode->i_mtime = CURRENT_TIME;
	ret = ocfs2_mark_inode_dirty(handle, inode, di_bh);
	if (ret < 0)
		mlog_errno(ret);

	ocfs2_commit_trans(osb, handle);

M
Mark Fasheh 已提交
1603
out_inode_unlock:
1604
	brelse(di_bh);
M
Mark Fasheh 已提交
1605
	ocfs2_inode_unlock(inode, 1);
1606 1607 1608 1609
out_rw_unlock:
	ocfs2_rw_unlock(inode, 1);

out:
1610
	mutex_unlock(&inode->i_mutex);
1611 1612 1613
	return ret;
}

M
Mark Fasheh 已提交
1614 1615 1616 1617
int ocfs2_change_file_space(struct file *file, unsigned int cmd,
			    struct ocfs2_space_resv *sr)
{
	struct inode *inode = file->f_path.dentry->d_inode;
1618
	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
M
Mark Fasheh 已提交
1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659

	if ((cmd == OCFS2_IOC_RESVSP || cmd == OCFS2_IOC_RESVSP64) &&
	    !ocfs2_writes_unwritten_extents(osb))
		return -ENOTTY;
	else if ((cmd == OCFS2_IOC_UNRESVSP || cmd == OCFS2_IOC_UNRESVSP64) &&
		 !ocfs2_sparse_alloc(osb))
		return -ENOTTY;

	if (!S_ISREG(inode->i_mode))
		return -EINVAL;

	if (!(file->f_mode & FMODE_WRITE))
		return -EBADF;

	return __ocfs2_change_file_space(file, inode, file->f_pos, cmd, sr, 0);
}

static long ocfs2_fallocate(struct inode *inode, int mode, loff_t offset,
			    loff_t len)
{
	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	struct ocfs2_space_resv sr;
	int change_size = 1;

	if (!ocfs2_writes_unwritten_extents(osb))
		return -EOPNOTSUPP;

	if (S_ISDIR(inode->i_mode))
		return -ENODEV;

	if (mode & FALLOC_FL_KEEP_SIZE)
		change_size = 0;

	sr.l_whence = 0;
	sr.l_start = (s64)offset;
	sr.l_len = (s64)len;

	return __ocfs2_change_file_space(NULL, inode, offset,
					 OCFS2_IOC_RESVSP64, &sr, change_size);
}

T
Tiger Yang 已提交
1660 1661 1662
static int ocfs2_prepare_inode_for_write(struct dentry *dentry,
					 loff_t *ppos,
					 size_t count,
1663 1664
					 int appending,
					 int *direct_io)
1665
{
1666
	int ret = 0, meta_level = 0;
T
Tiger Yang 已提交
1667
	struct inode *inode = dentry->d_inode;
1668
	loff_t saved_pos, end;
1669 1670

	/* 
1671 1672
	 * We start with a read level meta lock and only jump to an ex
	 * if we need to make modifications here.
1673 1674
	 */
	for(;;) {
M
Mark Fasheh 已提交
1675
		ret = ocfs2_inode_lock(inode, NULL, meta_level);
1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690
		if (ret < 0) {
			meta_level = -1;
			mlog_errno(ret);
			goto out;
		}

		/* Clear suid / sgid if necessary. We do this here
		 * instead of later in the write path because
		 * remove_suid() calls ->setattr without any hint that
		 * we may have already done our cluster locking. Since
		 * ocfs2_setattr() *must* take cluster locks to
		 * proceeed, this will lead us to recursively lock the
		 * inode. There's also the dinode i_size state which
		 * can be lost via setattr during extending writes (we
		 * set inode->i_size at the end of a write. */
T
Tiger Yang 已提交
1691
		if (should_remove_suid(dentry)) {
1692
			if (meta_level == 0) {
M
Mark Fasheh 已提交
1693
				ocfs2_inode_unlock(inode, meta_level);
1694 1695 1696 1697 1698 1699 1700
				meta_level = 1;
				continue;
			}

			ret = ocfs2_write_remove_suid(inode);
			if (ret < 0) {
				mlog_errno(ret);
T
Tiger Yang 已提交
1701
				goto out_unlock;
1702 1703 1704 1705 1706
			}
		}

		/* work on a copy of ppos until we're sure that we won't have
		 * to recalculate it due to relocking. */
T
Tiger Yang 已提交
1707
		if (appending) {
1708 1709 1710
			saved_pos = i_size_read(inode);
			mlog(0, "O_APPEND: inode->i_size=%llu\n", saved_pos);
		} else {
T
Tiger Yang 已提交
1711
			saved_pos = *ppos;
1712
		}
1713

1714
		end = saved_pos + count;
1715

1716 1717 1718 1719 1720
		/*
		 * Skip the O_DIRECT checks if we don't need
		 * them.
		 */
		if (!direct_io || !(*direct_io))
1721 1722
			break;

M
Mark Fasheh 已提交
1723 1724 1725 1726 1727 1728 1729 1730 1731
		/*
		 * There's no sane way to do direct writes to an inode
		 * with inline data.
		 */
		if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
			*direct_io = 0;
			break;
		}

1732
		/*
1733 1734 1735 1736
		 * Allowing concurrent direct writes means
		 * i_size changes wouldn't be synchronized, so
		 * one node could wind up truncating another
		 * nodes writes.
1737
		 */
1738 1739
		if (end > i_size_read(inode)) {
			*direct_io = 0;
1740 1741 1742
			break;
		}

1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754
		/*
		 * We don't fill holes during direct io, so
		 * check for them here. If any are found, the
		 * caller will have to retake some cluster
		 * locks and initiate the io as buffered.
		 */
		ret = ocfs2_check_range_for_holes(inode, saved_pos, count);
		if (ret == 1) {
			*direct_io = 0;
			ret = 0;
		} else if (ret < 0)
			mlog_errno(ret);
1755 1756 1757
		break;
	}

T
Tiger Yang 已提交
1758 1759 1760 1761
	if (appending)
		*ppos = saved_pos;

out_unlock:
M
Mark Fasheh 已提交
1762
	ocfs2_inode_unlock(inode, meta_level);
T
Tiger Yang 已提交
1763 1764 1765 1766 1767 1768 1769 1770 1771 1772

out:
	return ret;
}

static ssize_t ocfs2_file_aio_write(struct kiocb *iocb,
				    const struct iovec *iov,
				    unsigned long nr_segs,
				    loff_t pos)
{
1773
	int ret, direct_io, appending, rw_level, have_alloc_sem  = 0;
N
Nick Piggin 已提交
1774
	int can_do_direct;
1775 1776 1777
	ssize_t written = 0;
	size_t ocount;		/* original count */
	size_t count;		/* after file limit checks */
M
Mark Fasheh 已提交
1778 1779
	loff_t old_size, *ppos = &iocb->ki_pos;
	u32 old_clusters;
1780 1781
	struct file *file = iocb->ki_filp;
	struct inode *inode = file->f_path.dentry->d_inode;
M
Mark Fasheh 已提交
1782
	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1783 1784

	mlog_entry("(0x%p, %u, '%.*s')\n", file,
T
Tiger Yang 已提交
1785
		   (unsigned int)nr_segs,
1786 1787
		   file->f_path.dentry->d_name.len,
		   file->f_path.dentry->d_name.name);
T
Tiger Yang 已提交
1788 1789 1790 1791

	if (iocb->ki_left == 0)
		return 0;

1792 1793 1794 1795 1796
	vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE);

	appending = file->f_flags & O_APPEND ? 1 : 0;
	direct_io = file->f_flags & O_DIRECT ? 1 : 0;

T
Tiger Yang 已提交
1797
	mutex_lock(&inode->i_mutex);
1798 1799

relock:
T
Tiger Yang 已提交
1800
	/* to match setattr's i_mutex -> i_alloc_sem -> rw_lock ordering */
1801
	if (direct_io) {
T
Tiger Yang 已提交
1802
		down_read(&inode->i_alloc_sem);
1803
		have_alloc_sem = 1;
T
Tiger Yang 已提交
1804 1805 1806
	}

	/* concurrent O_DIRECT writes are allowed */
1807
	rw_level = !direct_io;
T
Tiger Yang 已提交
1808 1809 1810
	ret = ocfs2_rw_lock(inode, rw_level);
	if (ret < 0) {
		mlog_errno(ret);
1811
		goto out_sems;
T
Tiger Yang 已提交
1812 1813
	}

1814 1815 1816 1817
	can_do_direct = direct_io;
	ret = ocfs2_prepare_inode_for_write(file->f_path.dentry, ppos,
					    iocb->ki_left, appending,
					    &can_do_direct);
T
Tiger Yang 已提交
1818 1819 1820 1821
	if (ret < 0) {
		mlog_errno(ret);
		goto out;
	}
1822

1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837
	/*
	 * We can't complete the direct I/O as requested, fall back to
	 * buffered I/O.
	 */
	if (direct_io && !can_do_direct) {
		ocfs2_rw_unlock(inode, rw_level);
		up_read(&inode->i_alloc_sem);

		have_alloc_sem = 0;
		rw_level = -1;

		direct_io = 0;
		goto relock;
	}

M
Mark Fasheh 已提交
1838 1839 1840 1841 1842 1843 1844
	/*
	 * To later detect whether a journal commit for sync writes is
	 * necessary, we sample i_size, and cluster count here.
	 */
	old_size = i_size_read(inode);
	old_clusters = OCFS2_I(inode)->ip_clusters;

1845
	/* communicate with ocfs2_dio_end_io */
1846
	ocfs2_iocb_set_rw_locked(iocb, rw_level);
1847

1848
	if (direct_io) {
N
Nick Piggin 已提交
1849 1850 1851 1852 1853 1854 1855 1856 1857 1858
		ret = generic_segment_checks(iov, &nr_segs, &ocount,
					     VERIFY_READ);
		if (ret)
			goto out_dio;

		ret = generic_write_checks(file, ppos, &count,
					   S_ISBLK(inode->i_mode));
		if (ret)
			goto out_dio;

1859 1860 1861
		written = generic_file_direct_write(iocb, iov, &nr_segs, *ppos,
						    ppos, count, ocount);
		if (written < 0) {
1862 1863 1864 1865 1866 1867 1868
			/*
			 * direct write may have instantiated a few
			 * blocks outside i_size. Trim these off again.
			 * Don't need i_size_read because we hold i_mutex.
			 */
			if (*ppos + count > inode->i_size)
				vmtruncate(inode, inode->i_size);
1869 1870 1871 1872
			ret = written;
			goto out_dio;
		}
	} else {
N
Nick Piggin 已提交
1873 1874
		written = generic_file_aio_write_nolock(iocb, iov, nr_segs,
							*ppos);
1875
	}
1876

1877
out_dio:
1878
	/* buffered aio wouldn't have proper lock coverage today */
1879
	BUG_ON(ret == -EIOCBQUEUED && !(file->f_flags & O_DIRECT));
1880

M
Mark Fasheh 已提交
1881 1882 1883 1884 1885 1886 1887 1888 1889
	if ((file->f_flags & O_SYNC && !direct_io) || IS_SYNC(inode)) {
		/*
		 * The generic write paths have handled getting data
		 * to disk, but since we don't make use of the dirty
		 * inode list, a manual journal commit is necessary
		 * here.
		 */
		if (old_size != i_size_read(inode) ||
		    old_clusters != OCFS2_I(inode)->ip_clusters) {
J
Joel Becker 已提交
1890
			ret = jbd2_journal_force_commit(osb->journal->j_journal);
M
Mark Fasheh 已提交
1891 1892 1893 1894 1895
			if (ret < 0)
				written = ret;
		}
	}

1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911
	/* 
	 * deep in g_f_a_w_n()->ocfs2_direct_IO we pass in a ocfs2_dio_end_io
	 * function pointer which is called when o_direct io completes so that
	 * it can unlock our rw lock.  (it's the clustered equivalent of
	 * i_alloc_sem; protects truncate from racing with pending ios).
	 * Unfortunately there are error cases which call end_io and others
	 * that don't.  so we don't have to unlock the rw_lock if either an
	 * async dio is going to do it in the future or an end_io after an
	 * error has already done it.
	 */
	if (ret == -EIOCBQUEUED || !ocfs2_iocb_is_rw_locked(iocb)) {
		rw_level = -1;
		have_alloc_sem = 0;
	}

out:
1912 1913 1914 1915
	if (rw_level != -1)
		ocfs2_rw_unlock(inode, rw_level);

out_sems:
1916 1917
	if (have_alloc_sem)
		up_read(&inode->i_alloc_sem);
1918

1919
	mutex_unlock(&inode->i_mutex);
1920 1921

	mlog_exit(ret);
1922
	return written ? written : ret;
1923 1924
}

1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940
static int ocfs2_splice_to_file(struct pipe_inode_info *pipe,
				struct file *out,
				struct splice_desc *sd)
{
	int ret;

	ret = ocfs2_prepare_inode_for_write(out->f_path.dentry,	&sd->pos,
					    sd->total_len, 0, NULL);
	if (ret < 0) {
		mlog_errno(ret);
		return ret;
	}

	return splice_from_pipe_feed(pipe, sd, pipe_to_file);
}

T
Tiger Yang 已提交
1941 1942 1943 1944 1945 1946 1947
static ssize_t ocfs2_file_splice_write(struct pipe_inode_info *pipe,
				       struct file *out,
				       loff_t *ppos,
				       size_t len,
				       unsigned int flags)
{
	int ret;
1948 1949 1950 1951 1952 1953 1954 1955
	struct address_space *mapping = out->f_mapping;
	struct inode *inode = mapping->host;
	struct splice_desc sd = {
		.total_len = len,
		.flags = flags,
		.pos = *ppos,
		.u.file = out,
	};
T
Tiger Yang 已提交
1956 1957 1958

	mlog_entry("(0x%p, 0x%p, %u, '%.*s')\n", out, pipe,
		   (unsigned int)len,
J
Josef Sipek 已提交
1959 1960
		   out->f_path.dentry->d_name.len,
		   out->f_path.dentry->d_name.name);
T
Tiger Yang 已提交
1961

1962 1963
	if (pipe->inode)
		mutex_lock_nested(&pipe->inode->i_mutex, I_MUTEX_PARENT);
T
Tiger Yang 已提交
1964

1965 1966 1967 1968 1969
	splice_from_pipe_begin(&sd);
	do {
		ret = splice_from_pipe_next(pipe, &sd);
		if (ret <= 0)
			break;
T
Tiger Yang 已提交
1970

1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981
		mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD);
		ret = ocfs2_rw_lock(inode, 1);
		if (ret < 0)
			mlog_errno(ret);
		else {
			ret = ocfs2_splice_to_file(pipe, out, &sd);
			ocfs2_rw_unlock(inode, 1);
		}
		mutex_unlock(&inode->i_mutex);
	} while (ret > 0);
	splice_from_pipe_end(pipe, &sd);
T
Tiger Yang 已提交
1982

1983 1984
	if (pipe->inode)
		mutex_unlock(&pipe->inode->i_mutex);
T
Tiger Yang 已提交
1985

1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017
	if (sd.num_spliced)
		ret = sd.num_spliced;

	if (ret > 0) {
		unsigned long nr_pages;

		*ppos += ret;
		nr_pages = (ret + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;

		/*
		 * If file or inode is SYNC and we actually wrote some data,
		 * sync it.
		 */
		if (unlikely((out->f_flags & O_SYNC) || IS_SYNC(inode))) {
			int err;

			mutex_lock(&inode->i_mutex);
			err = ocfs2_rw_lock(inode, 1);
			if (err < 0) {
				mlog_errno(err);
			} else {
				err = generic_osync_inode(inode, mapping,
						  OSYNC_METADATA|OSYNC_DATA);
				ocfs2_rw_unlock(inode, 1);
			}
			mutex_unlock(&inode->i_mutex);

			if (err)
				ret = err;
		}
		balance_dirty_pages_ratelimited_nr(mapping, nr_pages);
	}
T
Tiger Yang 已提交
2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028

	mlog_exit(ret);
	return ret;
}

static ssize_t ocfs2_file_splice_read(struct file *in,
				      loff_t *ppos,
				      struct pipe_inode_info *pipe,
				      size_t len,
				      unsigned int flags)
{
2029
	int ret = 0, lock_level = 0;
J
Josef Sipek 已提交
2030
	struct inode *inode = in->f_path.dentry->d_inode;
T
Tiger Yang 已提交
2031 2032 2033

	mlog_entry("(0x%p, 0x%p, %u, '%.*s')\n", in, pipe,
		   (unsigned int)len,
J
Josef Sipek 已提交
2034 2035
		   in->f_path.dentry->d_name.len,
		   in->f_path.dentry->d_name.name);
T
Tiger Yang 已提交
2036 2037 2038 2039

	/*
	 * See the comment in ocfs2_file_aio_read()
	 */
2040
	ret = ocfs2_inode_lock_atime(inode, in->f_vfsmnt, &lock_level);
T
Tiger Yang 已提交
2041 2042 2043 2044
	if (ret < 0) {
		mlog_errno(ret);
		goto bail;
	}
2045
	ocfs2_inode_unlock(inode, lock_level);
T
Tiger Yang 已提交
2046 2047 2048 2049 2050 2051 2052 2053

	ret = generic_file_splice_read(in, ppos, pipe, len, flags);

bail:
	mlog_exit(ret);
	return ret;
}

2054
static ssize_t ocfs2_file_aio_read(struct kiocb *iocb,
2055 2056
				   const struct iovec *iov,
				   unsigned long nr_segs,
2057 2058
				   loff_t pos)
{
2059
	int ret = 0, rw_level = -1, have_alloc_sem = 0, lock_level = 0;
2060
	struct file *filp = iocb->ki_filp;
J
Josef Sipek 已提交
2061
	struct inode *inode = filp->f_path.dentry->d_inode;
2062

2063 2064
	mlog_entry("(0x%p, %u, '%.*s')\n", filp,
		   (unsigned int)nr_segs,
J
Josef Sipek 已提交
2065 2066
		   filp->f_path.dentry->d_name.len,
		   filp->f_path.dentry->d_name.name);
2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088

	if (!inode) {
		ret = -EINVAL;
		mlog_errno(ret);
		goto bail;
	}

	/* 
	 * buffered reads protect themselves in ->readpage().  O_DIRECT reads
	 * need locks to protect pending reads from racing with truncate.
	 */
	if (filp->f_flags & O_DIRECT) {
		down_read(&inode->i_alloc_sem);
		have_alloc_sem = 1;

		ret = ocfs2_rw_lock(inode, 0);
		if (ret < 0) {
			mlog_errno(ret);
			goto bail;
		}
		rw_level = 0;
		/* communicate with ocfs2_dio_end_io */
2089
		ocfs2_iocb_set_rw_locked(iocb, rw_level);
2090 2091
	}

2092 2093 2094 2095 2096 2097 2098 2099 2100
	/*
	 * We're fine letting folks race truncates and extending
	 * writes with read across the cluster, just like they can
	 * locally. Hence no rw_lock during read.
	 * 
	 * Take and drop the meta data lock to update inode fields
	 * like i_size. This allows the checks down below
	 * generic_file_aio_read() a chance of actually working. 
	 */
M
Mark Fasheh 已提交
2101
	ret = ocfs2_inode_lock_atime(inode, filp->f_vfsmnt, &lock_level);
2102 2103 2104 2105
	if (ret < 0) {
		mlog_errno(ret);
		goto bail;
	}
M
Mark Fasheh 已提交
2106
	ocfs2_inode_unlock(inode, lock_level);
2107

2108
	ret = generic_file_aio_read(iocb, iov, nr_segs, iocb->ki_pos);
2109
	if (ret == -EINVAL)
2110
		mlog(0, "generic_file_aio_read returned -EINVAL\n");
2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130

	/* buffered aio wouldn't have proper lock coverage today */
	BUG_ON(ret == -EIOCBQUEUED && !(filp->f_flags & O_DIRECT));

	/* see ocfs2_file_aio_write */
	if (ret == -EIOCBQUEUED || !ocfs2_iocb_is_rw_locked(iocb)) {
		rw_level = -1;
		have_alloc_sem = 0;
	}

bail:
	if (have_alloc_sem)
		up_read(&inode->i_alloc_sem);
	if (rw_level != -1) 
		ocfs2_rw_unlock(inode, rw_level);
	mlog_exit(ret);

	return ret;
}

2131
const struct inode_operations ocfs2_file_iops = {
2132 2133
	.setattr	= ocfs2_setattr,
	.getattr	= ocfs2_getattr,
T
Tiger Yang 已提交
2134
	.permission	= ocfs2_permission,
T
Tiger Yang 已提交
2135 2136 2137 2138
	.setxattr	= generic_setxattr,
	.getxattr	= generic_getxattr,
	.listxattr	= ocfs2_listxattr,
	.removexattr	= generic_removexattr,
M
Mark Fasheh 已提交
2139
	.fallocate	= ocfs2_fallocate,
M
Mark Fasheh 已提交
2140
	.fiemap		= ocfs2_fiemap,
2141 2142
};

2143
const struct inode_operations ocfs2_special_file_iops = {
2144 2145
	.setattr	= ocfs2_setattr,
	.getattr	= ocfs2_getattr,
T
Tiger Yang 已提交
2146
	.permission	= ocfs2_permission,
2147 2148
};

M
Mark Fasheh 已提交
2149 2150 2151 2152
/*
 * Other than ->lock, keep ocfs2_fops and ocfs2_dops in sync with
 * ocfs2_fops_no_plocks and ocfs2_dops_no_plocks!
 */
2153
const struct file_operations ocfs2_fops = {
J
Jan Kara 已提交
2154
	.llseek		= generic_file_llseek,
2155 2156 2157 2158 2159 2160 2161 2162
	.read		= do_sync_read,
	.write		= do_sync_write,
	.mmap		= ocfs2_mmap,
	.fsync		= ocfs2_sync_file,
	.release	= ocfs2_file_release,
	.open		= ocfs2_file_open,
	.aio_read	= ocfs2_file_aio_read,
	.aio_write	= ocfs2_file_aio_write,
2163
	.unlocked_ioctl	= ocfs2_ioctl,
M
Mark Fasheh 已提交
2164 2165 2166
#ifdef CONFIG_COMPAT
	.compat_ioctl   = ocfs2_compat_ioctl,
#endif
M
Mark Fasheh 已提交
2167
	.lock		= ocfs2_lock,
2168
	.flock		= ocfs2_flock,
T
Tiger Yang 已提交
2169 2170
	.splice_read	= ocfs2_file_splice_read,
	.splice_write	= ocfs2_file_splice_write,
2171 2172
};

2173
const struct file_operations ocfs2_dops = {
J
Jan Kara 已提交
2174
	.llseek		= generic_file_llseek,
2175 2176 2177
	.read		= generic_read_dir,
	.readdir	= ocfs2_readdir,
	.fsync		= ocfs2_sync_file,
2178 2179
	.release	= ocfs2_dir_release,
	.open		= ocfs2_dir_open,
2180
	.unlocked_ioctl	= ocfs2_ioctl,
M
Mark Fasheh 已提交
2181 2182
#ifdef CONFIG_COMPAT
	.compat_ioctl   = ocfs2_compat_ioctl,
M
Mark Fasheh 已提交
2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228
#endif
	.lock		= ocfs2_lock,
	.flock		= ocfs2_flock,
};

/*
 * POSIX-lockless variants of our file_operations.
 *
 * These will be used if the underlying cluster stack does not support
 * posix file locking, if the user passes the "localflocks" mount
 * option, or if we have a local-only fs.
 *
 * ocfs2_flock is in here because all stacks handle UNIX file locks,
 * so we still want it in the case of no stack support for
 * plocks. Internally, it will do the right thing when asked to ignore
 * the cluster.
 */
const struct file_operations ocfs2_fops_no_plocks = {
	.llseek		= generic_file_llseek,
	.read		= do_sync_read,
	.write		= do_sync_write,
	.mmap		= ocfs2_mmap,
	.fsync		= ocfs2_sync_file,
	.release	= ocfs2_file_release,
	.open		= ocfs2_file_open,
	.aio_read	= ocfs2_file_aio_read,
	.aio_write	= ocfs2_file_aio_write,
	.unlocked_ioctl	= ocfs2_ioctl,
#ifdef CONFIG_COMPAT
	.compat_ioctl   = ocfs2_compat_ioctl,
#endif
	.flock		= ocfs2_flock,
	.splice_read	= ocfs2_file_splice_read,
	.splice_write	= ocfs2_file_splice_write,
};

const struct file_operations ocfs2_dops_no_plocks = {
	.llseek		= generic_file_llseek,
	.read		= generic_read_dir,
	.readdir	= ocfs2_readdir,
	.fsync		= ocfs2_sync_file,
	.release	= ocfs2_dir_release,
	.open		= ocfs2_dir_open,
	.unlocked_ioctl	= ocfs2_ioctl,
#ifdef CONFIG_COMPAT
	.compat_ioctl   = ocfs2_compat_ioctl,
M
Mark Fasheh 已提交
2229
#endif
2230
	.flock		= ocfs2_flock,
2231
};