file.c 51.7 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;

	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;
}

/*
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 * 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)
511
{
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	int ret;
	struct ocfs2_extent_tree et;
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515
	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;
530
	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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	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);
627 628 629 630
	/* Release unused quota reservation */
	vfs_dq_free_space(inode,
			ocfs2_clusters_to_bytes(osb->sb, clusters_to_add));
	did_quota = 0;
631 632 633 634 635 636 637 638 639 640 641

	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,
642
							    &fe->id2.i_list,
643
							    clusters_to_add);
644
			status = ocfs2_extend_trans(handle, credits);
645 646 647 648 649 650 651 652 653 654 655
			if (status < 0) {
				/* handle still has to be committed at
				 * this point. */
				status = -ENOMEM;
				mlog_errno(status);
				goto leave;
			}
			goto restarted_transaction;
		}
	}

656
	mlog(0, "fe: i_clusters = %u, i_size=%llu\n",
657 658
	     le32_to_cpu(fe->i_clusters),
	     (unsigned long long)le64_to_cpu(fe->i_size));
659
	mlog(0, "inode: ip_clusters=%u, i_size=%lld\n",
J
Jan Kara 已提交
660
	     OCFS2_I(inode)->ip_clusters, (long long)i_size_read(inode));
661 662

leave:
663 664 665
	if (status < 0 && did_quota)
		vfs_dq_free_space(inode,
			ocfs2_clusters_to_bytes(osb->sb, clusters_to_add));
666
	if (handle) {
667
		ocfs2_commit_trans(osb, handle);
668 669 670 671 672 673 674 675 676 677 678 679 680 681
		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;
	}
682 683
	brelse(bh);
	bh = NULL;
684 685 686 687 688 689 690

	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
691
 * worry about recursive locking in ->write_begin() and ->write_end(). */
692 693 694 695 696 697 698
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;
699
	handle_t *handle = NULL;
700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718
	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;
	}

719
	ret = ocfs2_prepare_write_nolock(inode, page, offset, offset);
720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742
	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)
743
		ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766
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;
767 768 769 770 771 772

		/*
		 * Very large extends have the potential to lock up
		 * the cpu for extended periods of time.
		 */
		cond_resched();
773 774 775 776 777 778
	}

out:
	return ret;
}

779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812
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;
}

813 814
static int ocfs2_extend_file(struct inode *inode,
			     struct buffer_head *di_bh,
815
			     u64 new_i_size)
816
{
M
Mark Fasheh 已提交
817
	int ret = 0;
M
Mark Fasheh 已提交
818
	struct ocfs2_inode_info *oi = OCFS2_I(inode);
819

820
	BUG_ON(!di_bh);
821

822 823 824 825 826 827 828 829
	/* 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
830 831 832 833 834 835 836 837 838 839 840
	/*
	 * 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)))
841
		goto out_update_size;
842

843
	/*
844 845 846 847
	 * 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.
848
	 */
M
Mark Fasheh 已提交
849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865
	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
866
			goto out;
M
Mark Fasheh 已提交
867 868 869 870 871 872 873
		}
	}

	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);
874

875 876
	if (ret < 0) {
		mlog_errno(ret);
M
Mark Fasheh 已提交
877
		goto out;
878 879
	}

880
out_update_size:
881 882 883
	ret = ocfs2_simple_size_update(inode, di_bh, new_i_size);
	if (ret < 0)
		mlog_errno(ret);
884 885 886 887 888 889 890 891 892 893 894 895

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;
896
	handle_t *handle = NULL;
897 898 899
	int locked[MAXQUOTAS] = {0, 0};
	int credits, qtype;
	struct ocfs2_mem_dqinfo *oinfo;
900 901 902 903

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

904 905 906 907
	/* ensuring we don't even attempt to truncate a symlink */
	if (S_ISLNK(inode->i_mode))
		attr->ia_valid &= ~ATTR_SIZE;

908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938
	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
939
	status = ocfs2_inode_lock(inode, &bh, 1);
940 941 942 943 944 945 946
	if (status < 0) {
		if (status != -ENOENT)
			mlog_errno(status);
		goto bail_unlock_rw;
	}

	if (size_change && attr->ia_size != i_size_read(inode)) {
947 948 949 950 951
		if (attr->ia_size > sb->s_maxbytes) {
			status = -EFBIG;
			goto bail_unlock;
		}

J
Joel Becker 已提交
952 953 954 955 956 957 958
		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;
			}
959
			status = ocfs2_truncate_file(inode, bh, attr->ia_size);
J
Joel Becker 已提交
960
		} else
961
			status = ocfs2_extend_file(inode, bh, attr->ia_size);
962 963 964 965 966 967 968 969
		if (status < 0) {
			if (status != -ENOSPC)
				mlog_errno(status);
			status = -ENOSPC;
			goto bail_unlock;
		}
	}

970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010
	if ((attr->ia_valid & ATTR_UID && attr->ia_uid != inode->i_uid) ||
	    (attr->ia_valid & ATTR_GID && attr->ia_gid != inode->i_gid)) {
		credits = OCFS2_INODE_UPDATE_CREDITS;
		if (attr->ia_valid & ATTR_UID && attr->ia_uid != inode->i_uid
		    && OCFS2_HAS_RO_COMPAT_FEATURE(sb,
		    OCFS2_FEATURE_RO_COMPAT_USRQUOTA)) {
			oinfo = sb_dqinfo(sb, USRQUOTA)->dqi_priv;
			status = ocfs2_lock_global_qf(oinfo, 1);
			if (status < 0)
				goto bail_unlock;
			credits += ocfs2_calc_qinit_credits(sb, USRQUOTA) +
				ocfs2_calc_qdel_credits(sb, USRQUOTA);
			locked[USRQUOTA] = 1;
		}
		if (attr->ia_valid & ATTR_GID && attr->ia_gid != inode->i_gid
		    && OCFS2_HAS_RO_COMPAT_FEATURE(sb,
		    OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)) {
			oinfo = sb_dqinfo(sb, GRPQUOTA)->dqi_priv;
			status = ocfs2_lock_global_qf(oinfo, 1);
			if (status < 0)
				goto bail_unlock;
			credits += ocfs2_calc_qinit_credits(sb, GRPQUOTA) +
				   ocfs2_calc_qdel_credits(sb, GRPQUOTA);
			locked[GRPQUOTA] = 1;
		}
		handle = ocfs2_start_trans(osb, credits);
		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;
		}
1011 1012
	}

M
Mark Fasheh 已提交
1013 1014 1015 1016 1017 1018 1019
	/*
	 * 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.
	 */
1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030
	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:
1031
	ocfs2_commit_trans(osb, handle);
1032
bail_unlock:
1033 1034 1035 1036 1037 1038
	for (qtype = 0; qtype < MAXQUOTAS; qtype++) {
		if (!locked[qtype])
			continue;
		oinfo = sb_dqinfo(sb, qtype)->dqi_priv;
		ocfs2_unlock_global_qf(oinfo, 1);
	}
M
Mark Fasheh 已提交
1039
	ocfs2_inode_unlock(inode, 1);
1040 1041 1042 1043
bail_unlock_rw:
	if (size_change)
		ocfs2_rw_unlock(inode, 1);
bail:
1044
	brelse(bh);
1045

T
Tiger Yang 已提交
1046 1047 1048 1049 1050 1051
	if (!status && attr->ia_valid & ATTR_MODE) {
		status = ocfs2_acl_chmod(inode);
		if (status < 0)
			mlog_errno(status);
	}

1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084
	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;
}

1085
int ocfs2_permission(struct inode *inode, int mask)
T
Tiger Yang 已提交
1086 1087 1088 1089 1090
{
	int ret;

	mlog_entry_void();

M
Mark Fasheh 已提交
1091
	ret = ocfs2_inode_lock(inode, NULL, 0);
T
Tiger Yang 已提交
1092
	if (ret) {
M
Mark Fasheh 已提交
1093 1094
		if (ret != -ENOENT)
			mlog_errno(ret);
T
Tiger Yang 已提交
1095 1096 1097
		goto out;
	}

T
Tiger Yang 已提交
1098
	ret = generic_permission(inode, mask, ocfs2_check_acl);
T
Tiger Yang 已提交
1099

M
Mark Fasheh 已提交
1100
	ocfs2_inode_unlock(inode, 0);
T
Tiger Yang 已提交
1101 1102 1103 1104 1105
out:
	mlog_exit(ret);
	return ret;
}

1106 1107
static int __ocfs2_write_remove_suid(struct inode *inode,
				     struct buffer_head *bh)
1108 1109
{
	int ret;
1110
	handle_t *handle;
1111 1112 1113
	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	struct ocfs2_dinode *di;

1114
	mlog_entry("(Inode %llu, mode 0%o)\n",
1115
		   (unsigned long long)OCFS2_I(inode)->ip_blkno, inode->i_mode);
1116

1117
	handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1118 1119
	if (IS_ERR(handle)) {
		ret = PTR_ERR(handle);
1120 1121 1122 1123
		mlog_errno(ret);
		goto out;
	}

1124 1125
	ret = ocfs2_journal_access_di(handle, inode, bh,
				      OCFS2_JOURNAL_ACCESS_WRITE);
1126 1127
	if (ret < 0) {
		mlog_errno(ret);
1128
		goto out_trans;
1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140
	}

	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);
1141

1142
out_trans:
1143
	ocfs2_commit_trans(osb, handle);
1144 1145 1146 1147 1148
out:
	mlog_exit(ret);
	return ret;
}

1149 1150 1151 1152 1153 1154 1155 1156
/*
 * 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;
1157
	unsigned int extent_flags;
1158 1159 1160 1161 1162 1163 1164
	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) {
1165 1166
		ret = ocfs2_get_clusters(inode, cpos, &phys_cpos, &extent_len,
					 &extent_flags);
1167 1168 1169 1170 1171
		if (ret < 0) {
			mlog_errno(ret);
			goto out;
		}

1172
		if (phys_cpos == 0 || (extent_flags & OCFS2_EXT_UNWRITTEN)) {
1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186
			ret = 1;
			break;
		}

		if (extent_len > clusters)
			extent_len = clusters;

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

1187 1188 1189 1190 1191
static int ocfs2_write_remove_suid(struct inode *inode)
{
	int ret;
	struct buffer_head *bh = NULL;

1192
	ret = ocfs2_read_inode_block(inode, &bh);
1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203
	if (ret < 0) {
		mlog_errno(ret);
		goto out;
	}

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

1204 1205 1206 1207 1208 1209 1210 1211 1212 1213
/*
 * 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
1214 1215 1216 1217
	u64 end = start + len;
	struct buffer_head *di_bh = NULL;

	if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1218
		ret = ocfs2_read_inode_block(inode, &di_bh);
M
Mark Fasheh 已提交
1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236
		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;
		}
	}
1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 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

	/*
	 * 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
1282 1283

	brelse(di_bh);
1284 1285 1286
	return ret;
}

1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 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
/*
 * 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);
1336 1337
	if (IS_ERR(handle)) {
		ret = PTR_ERR(handle);
1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 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
		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;
1385
	struct address_space *mapping = inode->i_mapping;
1386
	struct ocfs2_extent_tree et;
1387

1388
	ocfs2_init_dinode_extent_tree(&et, inode, di_bh);
1389 1390 1391 1392 1393
	ocfs2_init_dealloc_ctxt(&dealloc);

	if (byte_len == 0)
		return 0;

M
Mark Fasheh 已提交
1394 1395
	if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
		ret = ocfs2_truncate_inline(inode, di_bh, byte_start,
1396 1397
					    byte_start + byte_len, 0);
		if (ret) {
M
Mark Fasheh 已提交
1398
			mlog_errno(ret);
1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409
			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
1410 1411
	}

1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443
	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) {
1444 1445 1446
			ret = ocfs2_remove_btree_range(inode, &et, cpos,
						       phys_cpos, alloc_size,
						       &dealloc);
1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465
			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;
}

1466 1467 1468
/*
 * Parts of this function taken from xfs_change_file_space()
 */
M
Mark Fasheh 已提交
1469 1470 1471 1472
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)
1473 1474 1475
{
	int ret;
	s64 llen;
M
Mark Fasheh 已提交
1476
	loff_t size;
1477 1478 1479
	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	struct buffer_head *di_bh = NULL;
	handle_t *handle;
1480
	unsigned long long max_off = inode->i_sb->s_maxbytes;
1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495

	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
1496
	ret = ocfs2_inode_lock(inode, &di_bh, 1);
1497 1498 1499 1500 1501 1502 1503
	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
1504
		goto out_inode_unlock;
1505 1506 1507 1508 1509 1510
	}

	switch (sr->l_whence) {
	case 0: /*SEEK_SET*/
		break;
	case 1: /*SEEK_CUR*/
M
Mark Fasheh 已提交
1511
		sr->l_start += f_pos;
1512 1513 1514 1515 1516 1517
		break;
	case 2: /*SEEK_END*/
		sr->l_start += i_size_read(inode);
		break;
	default:
		ret = -EINVAL;
M
Mark Fasheh 已提交
1518
		goto out_inode_unlock;
1519 1520 1521 1522 1523 1524 1525 1526 1527 1528
	}
	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
1529
		goto out_inode_unlock;
1530
	}
M
Mark Fasheh 已提交
1531
	size = sr->l_start + sr->l_len;
1532 1533 1534 1535

	if (cmd == OCFS2_IOC_RESVSP || cmd == OCFS2_IOC_RESVSP64) {
		if (sr->l_len <= 0) {
			ret = -EINVAL;
M
Mark Fasheh 已提交
1536
			goto out_inode_unlock;
1537 1538 1539
		}
	}

M
Mark Fasheh 已提交
1540
	if (file && should_remove_suid(file->f_path.dentry)) {
1541 1542 1543
		ret = __ocfs2_write_remove_suid(inode, di_bh);
		if (ret) {
			mlog_errno(ret);
M
Mark Fasheh 已提交
1544
			goto out_inode_unlock;
1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569
		}
	}

	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
1570
		goto out_inode_unlock;
1571 1572 1573 1574 1575 1576 1577 1578 1579
	}

	/*
	 * 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
1580
		goto out_inode_unlock;
1581 1582
	}

M
Mark Fasheh 已提交
1583 1584 1585
	if (change_size && i_size_read(inode) < size)
		i_size_write(inode, size);

1586 1587 1588 1589 1590 1591 1592
	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
1593
out_inode_unlock:
1594
	brelse(di_bh);
M
Mark Fasheh 已提交
1595
	ocfs2_inode_unlock(inode, 1);
1596 1597 1598 1599
out_rw_unlock:
	ocfs2_rw_unlock(inode, 1);

out:
1600
	mutex_unlock(&inode->i_mutex);
1601 1602 1603
	return ret;
}

M
Mark Fasheh 已提交
1604 1605 1606 1607
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;
1608
	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
M
Mark Fasheh 已提交
1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 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

	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
1650 1651 1652
static int ocfs2_prepare_inode_for_write(struct dentry *dentry,
					 loff_t *ppos,
					 size_t count,
1653 1654
					 int appending,
					 int *direct_io)
1655
{
1656
	int ret = 0, meta_level = 0;
T
Tiger Yang 已提交
1657
	struct inode *inode = dentry->d_inode;
1658
	loff_t saved_pos, end;
1659 1660

	/* 
1661 1662
	 * We start with a read level meta lock and only jump to an ex
	 * if we need to make modifications here.
1663 1664
	 */
	for(;;) {
M
Mark Fasheh 已提交
1665
		ret = ocfs2_inode_lock(inode, NULL, meta_level);
1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680
		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
1681
		if (should_remove_suid(dentry)) {
1682
			if (meta_level == 0) {
M
Mark Fasheh 已提交
1683
				ocfs2_inode_unlock(inode, meta_level);
1684 1685 1686 1687 1688 1689 1690
				meta_level = 1;
				continue;
			}

			ret = ocfs2_write_remove_suid(inode);
			if (ret < 0) {
				mlog_errno(ret);
T
Tiger Yang 已提交
1691
				goto out_unlock;
1692 1693 1694 1695 1696
			}
		}

		/* 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
1697
		if (appending) {
1698 1699 1700
			saved_pos = i_size_read(inode);
			mlog(0, "O_APPEND: inode->i_size=%llu\n", saved_pos);
		} else {
T
Tiger Yang 已提交
1701
			saved_pos = *ppos;
1702
		}
1703

1704
		end = saved_pos + count;
1705

1706 1707 1708 1709 1710
		/*
		 * Skip the O_DIRECT checks if we don't need
		 * them.
		 */
		if (!direct_io || !(*direct_io))
1711 1712
			break;

M
Mark Fasheh 已提交
1713 1714 1715 1716 1717 1718 1719 1720 1721
		/*
		 * 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;
		}

1722
		/*
1723 1724 1725 1726
		 * Allowing concurrent direct writes means
		 * i_size changes wouldn't be synchronized, so
		 * one node could wind up truncating another
		 * nodes writes.
1727
		 */
1728 1729
		if (end > i_size_read(inode)) {
			*direct_io = 0;
1730 1731 1732
			break;
		}

1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744
		/*
		 * 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);
1745 1746 1747
		break;
	}

T
Tiger Yang 已提交
1748 1749 1750 1751
	if (appending)
		*ppos = saved_pos;

out_unlock:
M
Mark Fasheh 已提交
1752
	ocfs2_inode_unlock(inode, meta_level);
T
Tiger Yang 已提交
1753 1754 1755 1756 1757 1758 1759 1760 1761 1762

out:
	return ret;
}

static ssize_t ocfs2_file_aio_write(struct kiocb *iocb,
				    const struct iovec *iov,
				    unsigned long nr_segs,
				    loff_t pos)
{
1763
	int ret, direct_io, appending, rw_level, have_alloc_sem  = 0;
N
Nick Piggin 已提交
1764
	int can_do_direct;
1765 1766 1767
	ssize_t written = 0;
	size_t ocount;		/* original count */
	size_t count;		/* after file limit checks */
M
Mark Fasheh 已提交
1768 1769
	loff_t old_size, *ppos = &iocb->ki_pos;
	u32 old_clusters;
1770 1771
	struct file *file = iocb->ki_filp;
	struct inode *inode = file->f_path.dentry->d_inode;
M
Mark Fasheh 已提交
1772
	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1773 1774

	mlog_entry("(0x%p, %u, '%.*s')\n", file,
T
Tiger Yang 已提交
1775
		   (unsigned int)nr_segs,
1776 1777
		   file->f_path.dentry->d_name.len,
		   file->f_path.dentry->d_name.name);
T
Tiger Yang 已提交
1778 1779 1780 1781

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

1782 1783 1784 1785 1786
	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
1787
	mutex_lock(&inode->i_mutex);
1788 1789

relock:
T
Tiger Yang 已提交
1790
	/* to match setattr's i_mutex -> i_alloc_sem -> rw_lock ordering */
1791
	if (direct_io) {
T
Tiger Yang 已提交
1792
		down_read(&inode->i_alloc_sem);
1793
		have_alloc_sem = 1;
T
Tiger Yang 已提交
1794 1795 1796
	}

	/* concurrent O_DIRECT writes are allowed */
1797
	rw_level = !direct_io;
T
Tiger Yang 已提交
1798 1799 1800
	ret = ocfs2_rw_lock(inode, rw_level);
	if (ret < 0) {
		mlog_errno(ret);
1801
		goto out_sems;
T
Tiger Yang 已提交
1802 1803
	}

1804 1805 1806 1807
	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
1808 1809 1810 1811
	if (ret < 0) {
		mlog_errno(ret);
		goto out;
	}
1812

1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827
	/*
	 * 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
1828 1829 1830 1831 1832 1833 1834
	/*
	 * 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;

1835
	/* communicate with ocfs2_dio_end_io */
1836
	ocfs2_iocb_set_rw_locked(iocb, rw_level);
1837

1838
	if (direct_io) {
N
Nick Piggin 已提交
1839 1840 1841 1842 1843 1844 1845 1846 1847 1848
		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;

1849 1850 1851
		written = generic_file_direct_write(iocb, iov, &nr_segs, *ppos,
						    ppos, count, ocount);
		if (written < 0) {
1852 1853 1854 1855 1856 1857 1858
			/*
			 * 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);
1859 1860 1861 1862
			ret = written;
			goto out_dio;
		}
	} else {
N
Nick Piggin 已提交
1863 1864
		written = generic_file_aio_write_nolock(iocb, iov, nr_segs,
							*ppos);
1865
	}
1866

1867
out_dio:
1868
	/* buffered aio wouldn't have proper lock coverage today */
1869
	BUG_ON(ret == -EIOCBQUEUED && !(file->f_flags & O_DIRECT));
1870

M
Mark Fasheh 已提交
1871 1872 1873 1874 1875 1876 1877 1878 1879
	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
1880
			ret = jbd2_journal_force_commit(osb->journal->j_journal);
M
Mark Fasheh 已提交
1881 1882 1883 1884 1885
			if (ret < 0)
				written = ret;
		}
	}

1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901
	/* 
	 * 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:
1902 1903 1904 1905
	if (rw_level != -1)
		ocfs2_rw_unlock(inode, rw_level);

out_sems:
1906 1907
	if (have_alloc_sem)
		up_read(&inode->i_alloc_sem);
1908

1909
	mutex_unlock(&inode->i_mutex);
1910 1911

	mlog_exit(ret);
1912
	return written ? written : ret;
1913 1914
}

T
Tiger Yang 已提交
1915 1916 1917 1918 1919 1920 1921
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;
J
Josef Sipek 已提交
1922
	struct inode *inode = out->f_path.dentry->d_inode;
T
Tiger Yang 已提交
1923 1924 1925

	mlog_entry("(0x%p, 0x%p, %u, '%.*s')\n", out, pipe,
		   (unsigned int)len,
J
Josef Sipek 已提交
1926 1927
		   out->f_path.dentry->d_name.len,
		   out->f_path.dentry->d_name.name);
T
Tiger Yang 已提交
1928 1929 1930 1931 1932 1933 1934 1935 1936

	inode_double_lock(inode, pipe->inode);

	ret = ocfs2_rw_lock(inode, 1);
	if (ret < 0) {
		mlog_errno(ret);
		goto out;
	}

1937 1938
	ret = ocfs2_prepare_inode_for_write(out->f_path.dentry, ppos, len, 0,
					    NULL);
T
Tiger Yang 已提交
1939 1940 1941 1942 1943
	if (ret < 0) {
		mlog_errno(ret);
		goto out_unlock;
	}

N
Nick Piggin 已提交
1944
	ret = generic_file_splice_write_nolock(pipe, out, ppos, len, flags);
T
Tiger Yang 已提交
1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961

out_unlock:
	ocfs2_rw_unlock(inode, 1);
out:
	inode_double_unlock(inode, pipe->inode);

	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)
{
	int ret = 0;
J
Josef Sipek 已提交
1962
	struct inode *inode = in->f_path.dentry->d_inode;
T
Tiger Yang 已提交
1963 1964 1965

	mlog_entry("(0x%p, 0x%p, %u, '%.*s')\n", in, pipe,
		   (unsigned int)len,
J
Josef Sipek 已提交
1966 1967
		   in->f_path.dentry->d_name.len,
		   in->f_path.dentry->d_name.name);
T
Tiger Yang 已提交
1968 1969 1970 1971

	/*
	 * See the comment in ocfs2_file_aio_read()
	 */
M
Mark Fasheh 已提交
1972
	ret = ocfs2_inode_lock(inode, NULL, 0);
T
Tiger Yang 已提交
1973 1974 1975 1976
	if (ret < 0) {
		mlog_errno(ret);
		goto bail;
	}
M
Mark Fasheh 已提交
1977
	ocfs2_inode_unlock(inode, 0);
T
Tiger Yang 已提交
1978 1979 1980 1981 1982 1983 1984 1985

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

bail:
	mlog_exit(ret);
	return ret;
}

1986
static ssize_t ocfs2_file_aio_read(struct kiocb *iocb,
1987 1988
				   const struct iovec *iov,
				   unsigned long nr_segs,
1989 1990
				   loff_t pos)
{
1991
	int ret = 0, rw_level = -1, have_alloc_sem = 0, lock_level = 0;
1992
	struct file *filp = iocb->ki_filp;
J
Josef Sipek 已提交
1993
	struct inode *inode = filp->f_path.dentry->d_inode;
1994

1995 1996
	mlog_entry("(0x%p, %u, '%.*s')\n", filp,
		   (unsigned int)nr_segs,
J
Josef Sipek 已提交
1997 1998
		   filp->f_path.dentry->d_name.len,
		   filp->f_path.dentry->d_name.name);
1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020

	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 */
2021
		ocfs2_iocb_set_rw_locked(iocb, rw_level);
2022 2023
	}

2024 2025 2026 2027 2028 2029 2030 2031 2032
	/*
	 * 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
2033
	ret = ocfs2_inode_lock_atime(inode, filp->f_vfsmnt, &lock_level);
2034 2035 2036 2037
	if (ret < 0) {
		mlog_errno(ret);
		goto bail;
	}
M
Mark Fasheh 已提交
2038
	ocfs2_inode_unlock(inode, lock_level);
2039

2040
	ret = generic_file_aio_read(iocb, iov, nr_segs, iocb->ki_pos);
2041
	if (ret == -EINVAL)
2042
		mlog(0, "generic_file_aio_read returned -EINVAL\n");
2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062

	/* 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;
}

2063
const struct inode_operations ocfs2_file_iops = {
2064 2065
	.setattr	= ocfs2_setattr,
	.getattr	= ocfs2_getattr,
T
Tiger Yang 已提交
2066
	.permission	= ocfs2_permission,
T
Tiger Yang 已提交
2067 2068 2069 2070
	.setxattr	= generic_setxattr,
	.getxattr	= generic_getxattr,
	.listxattr	= ocfs2_listxattr,
	.removexattr	= generic_removexattr,
M
Mark Fasheh 已提交
2071
	.fallocate	= ocfs2_fallocate,
M
Mark Fasheh 已提交
2072
	.fiemap		= ocfs2_fiemap,
2073 2074
};

2075
const struct inode_operations ocfs2_special_file_iops = {
2076 2077
	.setattr	= ocfs2_setattr,
	.getattr	= ocfs2_getattr,
T
Tiger Yang 已提交
2078
	.permission	= ocfs2_permission,
2079 2080
};

M
Mark Fasheh 已提交
2081 2082 2083 2084
/*
 * Other than ->lock, keep ocfs2_fops and ocfs2_dops in sync with
 * ocfs2_fops_no_plocks and ocfs2_dops_no_plocks!
 */
2085
const struct file_operations ocfs2_fops = {
J
Jan Kara 已提交
2086
	.llseek		= generic_file_llseek,
2087 2088 2089 2090 2091 2092 2093 2094
	.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,
2095
	.unlocked_ioctl	= ocfs2_ioctl,
M
Mark Fasheh 已提交
2096 2097 2098
#ifdef CONFIG_COMPAT
	.compat_ioctl   = ocfs2_compat_ioctl,
#endif
M
Mark Fasheh 已提交
2099
	.lock		= ocfs2_lock,
2100
	.flock		= ocfs2_flock,
T
Tiger Yang 已提交
2101 2102
	.splice_read	= ocfs2_file_splice_read,
	.splice_write	= ocfs2_file_splice_write,
2103 2104
};

2105
const struct file_operations ocfs2_dops = {
J
Jan Kara 已提交
2106
	.llseek		= generic_file_llseek,
2107 2108 2109
	.read		= generic_read_dir,
	.readdir	= ocfs2_readdir,
	.fsync		= ocfs2_sync_file,
2110 2111
	.release	= ocfs2_dir_release,
	.open		= ocfs2_dir_open,
2112
	.unlocked_ioctl	= ocfs2_ioctl,
M
Mark Fasheh 已提交
2113 2114
#ifdef CONFIG_COMPAT
	.compat_ioctl   = ocfs2_compat_ioctl,
M
Mark Fasheh 已提交
2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160
#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
2161
#endif
2162
	.flock		= ocfs2_flock,
2163
};