file.c 56.4 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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#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"
#include "mmap.h"
#include "suballoc.h"
#include "super.h"

#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);
}

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);
	status = 0;
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);

	mlog_exit(0);

	return 0;
}

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;
	err = journal_force_commit(journal);

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);
	if (handle == NULL) {
		ret = -ENOMEM;
		mlog_errno(ret);
		goto out;
	}

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	ret = ocfs2_journal_access(handle, inode, bh,
				   OCFS2_JOURNAL_ACCESS_WRITE);
	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;
}

static int ocfs2_simple_size_update(struct inode *inode,
				    struct buffer_head *di_bh,
				    u64 new_i_size)
{
	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 (handle == NULL) {
		ret = -ENOMEM;
		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(handle, inode, fe_bh,
				      OCFS2_JOURNAL_ACCESS_WRITE);
	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_blocks = ocfs2_align_bytes_to_sectors(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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	fe = (struct ocfs2_dinode *) di_bh->b_data;
	if (!OCFS2_IS_VALID_DINODE(fe)) {
		OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, fe);
		status = -EIO;
		goto bail;
	}

	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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	/* This forces other nodes to sync and drop their pages. Do
	 * this 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.  */
	status = ocfs2_data_lock(inode, 1);
	if (status < 0) {
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		up_write(&OCFS2_I(inode)->ip_alloc_sem);

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		mlog_errno(status);
		goto bail;
	}

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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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	/* 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_data;
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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_data;
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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_data;
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	}

	/* TODO: orphan dir cleanup here. */
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bail_unlock_data:
	ocfs2_data_unlock(inode, 1);

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

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bail:

	mlog_exit(status);
	return status;
}

/*
 * extend allocation only here.
 * 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.
 */
int ocfs2_do_extend_allocation(struct ocfs2_super *osb,
			       struct inode *inode,
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			       u32 *logical_offset,
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			       u32 clusters_to_add,
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			       int mark_unwritten,
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			       struct buffer_head *fe_bh,
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			       handle_t *handle,
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			       struct ocfs2_alloc_context *data_ac,
			       struct ocfs2_alloc_context *meta_ac,
			       enum ocfs2_alloc_restarted *reason_ret)
{
	int status = 0;
	int free_extents;
	struct ocfs2_dinode *fe = (struct ocfs2_dinode *) fe_bh->b_data;
	enum ocfs2_alloc_restarted reason = RESTART_NONE;
	u32 bit_off, num_bits;
	u64 block;
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	u8 flags = 0;
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	BUG_ON(!clusters_to_add);

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	if (mark_unwritten)
		flags = OCFS2_EXT_UNWRITTEN;

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	free_extents = ocfs2_num_free_extents(osb, inode, fe);
	if (free_extents < 0) {
		status = free_extents;
		mlog_errno(status);
		goto leave;
	}

	/* there are two cases which could cause us to EAGAIN in the
	 * we-need-more-metadata case:
	 * 1) we haven't reserved *any*
	 * 2) we are so fragmented, we've needed to add metadata too
	 *    many times. */
	if (!free_extents && !meta_ac) {
		mlog(0, "we haven't reserved any metadata!\n");
		status = -EAGAIN;
		reason = RESTART_META;
		goto leave;
	} else if ((!free_extents)
		   && (ocfs2_alloc_context_bits_left(meta_ac)
		       < ocfs2_extend_meta_needed(fe))) {
		mlog(0, "filesystem is really fragmented...\n");
		status = -EAGAIN;
		reason = RESTART_META;
		goto leave;
	}

	status = ocfs2_claim_clusters(osb, handle, data_ac, 1,
				      &bit_off, &num_bits);
	if (status < 0) {
		if (status != -ENOSPC)
			mlog_errno(status);
		goto leave;
	}

	BUG_ON(num_bits > clusters_to_add);

	/* reserve our write early -- insert_extent may update the inode */
	status = ocfs2_journal_access(handle, inode, fe_bh,
				      OCFS2_JOURNAL_ACCESS_WRITE);
	if (status < 0) {
		mlog_errno(status);
		goto leave;
	}

	block = ocfs2_clusters_to_blocks(osb->sb, bit_off);
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	mlog(0, "Allocating %u clusters at block %u for inode %llu\n",
	     num_bits, bit_off, (unsigned long long)OCFS2_I(inode)->ip_blkno);
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	status = ocfs2_insert_extent(osb, handle, inode, fe_bh,
				     *logical_offset, block, num_bits,
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				     flags, meta_ac);
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	if (status < 0) {
		mlog_errno(status);
		goto leave;
	}

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

	clusters_to_add -= num_bits;
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	*logical_offset += num_bits;
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	if (clusters_to_add) {
		mlog(0, "need to alloc once more, clusters = %u, wanted = "
		     "%u\n", fe->i_clusters, clusters_to_add);
		status = -EAGAIN;
		reason = RESTART_TRANS;
	}

leave:
	mlog_exit(status);
	if (reason_ret)
		*reason_ret = reason;
	return status;
}

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/*
 * For a given allocation, determine which allocators will need to be
 * accessed, and lock them, reserving the appropriate number of bits.
 *
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 * Sparse file systems call this from ocfs2_write_begin_nolock()
 * and ocfs2_allocate_unwritten_extents().
 *
 * File systems which don't support holes call this from
 * ocfs2_extend_allocation().
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 */
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int ocfs2_lock_allocators(struct inode *inode, struct ocfs2_dinode *di,
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			  u32 clusters_to_add, u32 extents_to_split,
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			  struct ocfs2_alloc_context **data_ac,
			  struct ocfs2_alloc_context **meta_ac)
561
{
562
	int ret = 0, num_free_extents;
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	unsigned int max_recs_needed = clusters_to_add + 2 * extents_to_split;
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	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);

	*meta_ac = NULL;
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	if (data_ac)
		*data_ac = NULL;

	BUG_ON(clusters_to_add != 0 && data_ac == NULL);
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	mlog(0, "extend inode %llu, i_size = %lld, di->i_clusters = %u, "
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	     "clusters_to_add = %u, extents_to_split = %u\n",
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	     (unsigned long long)OCFS2_I(inode)->ip_blkno, i_size_read(inode),
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	     le32_to_cpu(di->i_clusters), clusters_to_add, extents_to_split);
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	num_free_extents = ocfs2_num_free_extents(osb, inode, di);
	if (num_free_extents < 0) {
		ret = num_free_extents;
		mlog_errno(ret);
		goto out;
	}

	/*
	 * Sparse allocation file systems need to be more conservative
	 * with reserving room for expansion - the actual allocation
	 * happens while we've got a journal handle open so re-taking
	 * a cluster lock (because we ran out of room for another
	 * extent) will violate ordering rules.
	 *
591
	 * Most of the time we'll only be seeing this 1 cluster at a time
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	 * anyway.
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	 *
	 * Always lock for any unwritten extents - we might want to
	 * add blocks during a split.
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	 */
	if (!num_free_extents ||
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	    (ocfs2_sparse_alloc(osb) && num_free_extents < max_recs_needed)) {
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		ret = ocfs2_reserve_new_metadata(osb, di, meta_ac);
		if (ret < 0) {
			if (ret != -ENOSPC)
				mlog_errno(ret);
			goto out;
		}
	}

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	if (clusters_to_add == 0)
		goto out;

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	ret = ocfs2_reserve_clusters(osb, clusters_to_add, data_ac);
	if (ret < 0) {
		if (ret != -ENOSPC)
			mlog_errno(ret);
		goto out;
	}

out:
	if (ret) {
		if (*meta_ac) {
			ocfs2_free_alloc_context(*meta_ac);
			*meta_ac = NULL;
		}

		/*
		 * We cannot have an error and a non null *data_ac.
		 */
	}

	return ret;
}

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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;
637
	int credits;
638
	u32 prev_clusters;
639 640
	struct buffer_head *bh = NULL;
	struct ocfs2_dinode *fe = NULL;
641
	handle_t *handle = NULL;
642 643 644 645 646 647 648
	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);

	mlog_entry("(clusters_to_add = %u)\n", clusters_to_add);

M
Mark Fasheh 已提交
649 650 651 652
	/*
	 * This function only exists for file systems which don't
	 * support holes.
	 */
653
	BUG_ON(mark_unwritten && !ocfs2_sparse_alloc(osb));
M
Mark Fasheh 已提交
654

655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671
	status = ocfs2_read_block(osb, OCFS2_I(inode)->ip_blkno, &bh,
				  OCFS2_BH_CACHED, inode);
	if (status < 0) {
		mlog_errno(status);
		goto leave;
	}

	fe = (struct ocfs2_dinode *) bh->b_data;
	if (!OCFS2_IS_VALID_DINODE(fe)) {
		OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, fe);
		status = -EIO;
		goto leave;
	}

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

672
	status = ocfs2_lock_allocators(inode, fe, clusters_to_add, 0, &data_ac,
673 674 675 676 677 678
				       &meta_ac);
	if (status) {
		mlog_errno(status);
		goto leave;
	}

679
	credits = ocfs2_calc_extend_credits(osb->sb, fe, clusters_to_add);
680
	handle = ocfs2_start_trans(osb, credits);
681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702
	if (IS_ERR(handle)) {
		status = PTR_ERR(handle);
		handle = NULL;
		mlog_errno(status);
		goto leave;
	}

restarted_transaction:
	/* 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. */
	status = ocfs2_journal_access(handle, inode, bh,
				      OCFS2_JOURNAL_ACCESS_WRITE);
	if (status < 0) {
		mlog_errno(status);
		goto leave;
	}

	prev_clusters = OCFS2_I(inode)->ip_clusters;

	status = ocfs2_do_extend_allocation(osb,
					    inode,
M
Mark Fasheh 已提交
703
					    &logical_start,
704
					    clusters_to_add,
705
					    mark_unwritten,
706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738
					    bh,
					    handle,
					    data_ac,
					    meta_ac,
					    &why);
	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);

	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,
							    fe,
							    clusters_to_add);
739
			status = ocfs2_extend_trans(handle, credits);
740 741 742 743 744 745 746 747 748 749 750
			if (status < 0) {
				/* handle still has to be committed at
				 * this point. */
				status = -ENOMEM;
				mlog_errno(status);
				goto leave;
			}
			goto restarted_transaction;
		}
	}

751
	mlog(0, "fe: i_clusters = %u, i_size=%llu\n",
752 753
	     le32_to_cpu(fe->i_clusters),
	     (unsigned long long)le64_to_cpu(fe->i_size));
754 755 756 757 758
	mlog(0, "inode: ip_clusters=%u, i_size=%lld\n",
	     OCFS2_I(inode)->ip_clusters, i_size_read(inode));

leave:
	if (handle) {
759
		ocfs2_commit_trans(osb, handle);
760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782
		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;
	}
	if (bh) {
		brelse(bh);
		bh = NULL;
	}

	mlog_exit(status);
	return status;
}

783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801
static int ocfs2_extend_allocation(struct inode *inode, u32 logical_start,
				   u32 clusters_to_add, int mark_unwritten)
{
	int ret;

	/*
	 * The alloc sem blocks peope 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.
	 */
	down_write(&OCFS2_I(inode)->ip_alloc_sem);
	ret = __ocfs2_extend_allocation(inode, logical_start, clusters_to_add,
					mark_unwritten);
	up_write(&OCFS2_I(inode)->ip_alloc_sem);

	return ret;
}

802 803
/* 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
804 805
 * worry about recursive locking in ->prepare_write() and
 * ->commit_write(). */
806 807 808 809 810 811 812
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;
813
	handle_t *handle = NULL;
814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832
	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;
	}

833
	ret = ocfs2_prepare_write_nolock(inode, page, offset, offset);
834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856
	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)
857
		ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880
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;
881 882 883 884 885 886

		/*
		 * Very large extends have the potential to lock up
		 * the cpu for extended periods of time.
		 */
		cond_resched();
887 888 889 890 891 892
	}

out:
	return ret;
}

893 894 895 896 897 898 899 900 901 902
/* 
 * A tail_to_skip value > 0 indicates that we're being called from
 * ocfs2_file_aio_write(). This has the following implications:
 *
 * - we don't want to update i_size
 * - di_bh will be NULL, which is fine because it's only used in the
 *   case where we want to update i_size.
 * - ocfs2_zero_extend() will then only be filling the hole created
 *   between i_size and the start of the write.
 */
903 904
static int ocfs2_extend_file(struct inode *inode,
			     struct buffer_head *di_bh,
905 906
			     u64 new_i_size,
			     size_t tail_to_skip)
907 908
{
	int ret = 0;
909
	u32 clusters_to_add = 0;
910

911 912
	BUG_ON(!tail_to_skip && !di_bh);

913 914 915 916 917 918 919 920
	/* 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));

921 922 923 924 925
	if (ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb))) {
		BUG_ON(tail_to_skip != 0);
		goto out_update_size;
	}

926 927 928
	clusters_to_add = ocfs2_clusters_for_bytes(inode->i_sb, new_i_size) - 
		OCFS2_I(inode)->ip_clusters;

929 930 931 932 933 934 935 936 937 938 939 940
	/* 
	 * protect the pages that ocfs2_zero_extend is going to be
	 * pulling into the page cache.. we do this before the
	 * metadata extend so that we don't get into the situation
	 * where we've extended the metadata but can't get the data
	 * lock to zero.
	 */
	ret = ocfs2_data_lock(inode, 1);
	if (ret < 0) {
		mlog_errno(ret);
		goto out;
	}
941

942
	if (clusters_to_add) {
943 944 945
		ret = ocfs2_extend_allocation(inode,
					      OCFS2_I(inode)->ip_clusters,
					      clusters_to_add, 0);
946 947
		if (ret < 0) {
			mlog_errno(ret);
948
			goto out_unlock;
949
		}
950
	}
951

952 953 954 955 956 957 958 959 960
	/*
	 * 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, (u64)new_i_size - tail_to_skip);
	if (ret < 0) {
		mlog_errno(ret);
		goto out_unlock;
961 962
	}

963
out_update_size:
964 965 966 967 968 969
	if (!tail_to_skip) {
		/* We're being called from ocfs2_setattr() which wants
		 * us to update i_size */
		ret = ocfs2_simple_size_update(inode, di_bh, new_i_size);
		if (ret < 0)
			mlog_errno(ret);
970 971
	}

972
out_unlock:
973 974
	if (!ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)))
		ocfs2_data_unlock(inode, 1);
975

976 977 978 979 980 981 982 983 984 985 986
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;
987
	handle_t *handle = NULL;
988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022

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

	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;
		}
	}

1023
	status = ocfs2_meta_lock(inode, &bh, 1);
1024 1025 1026 1027 1028 1029 1030 1031 1032 1033
	if (status < 0) {
		if (status != -ENOENT)
			mlog_errno(status);
		goto bail_unlock_rw;
	}

	if (size_change && attr->ia_size != i_size_read(inode)) {
		if (i_size_read(inode) > attr->ia_size)
			status = ocfs2_truncate_file(inode, bh, attr->ia_size);
		else
1034
			status = ocfs2_extend_file(inode, bh, attr->ia_size, 0);
1035 1036 1037 1038 1039 1040 1041 1042
		if (status < 0) {
			if (status != -ENOSPC)
				mlog_errno(status);
			status = -ENOSPC;
			goto bail_unlock;
		}
	}

1043
	handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1044 1045 1046 1047 1048 1049
	if (IS_ERR(handle)) {
		status = PTR_ERR(handle);
		mlog_errno(status);
		goto bail_unlock;
	}

M
Mark Fasheh 已提交
1050 1051 1052 1053 1054 1055 1056
	/*
	 * 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.
	 */
1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067
	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:
1068
	ocfs2_commit_trans(osb, handle);
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 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110
bail_unlock:
	ocfs2_meta_unlock(inode, 1);
bail_unlock_rw:
	if (size_change)
		ocfs2_rw_unlock(inode, 1);
bail:
	if (bh)
		brelse(bh);

	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;
}

T
Tiger Yang 已提交
1111 1112 1113 1114 1115 1116 1117 1118
int ocfs2_permission(struct inode *inode, int mask, struct nameidata *nd)
{
	int ret;

	mlog_entry_void();

	ret = ocfs2_meta_lock(inode, NULL, 0);
	if (ret) {
M
Mark Fasheh 已提交
1119 1120
		if (ret != -ENOENT)
			mlog_errno(ret);
T
Tiger Yang 已提交
1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131
		goto out;
	}

	ret = generic_permission(inode, mask, NULL);

	ocfs2_meta_unlock(inode, 0);
out:
	mlog_exit(ret);
	return ret;
}

1132 1133
static int __ocfs2_write_remove_suid(struct inode *inode,
				     struct buffer_head *bh)
1134 1135
{
	int ret;
1136
	handle_t *handle;
1137 1138 1139
	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	struct ocfs2_dinode *di;

1140
	mlog_entry("(Inode %llu, mode 0%o)\n",
1141
		   (unsigned long long)OCFS2_I(inode)->ip_blkno, inode->i_mode);
1142

1143
	handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1144 1145 1146 1147 1148 1149 1150 1151 1152 1153
	if (handle == NULL) {
		ret = -ENOMEM;
		mlog_errno(ret);
		goto out;
	}

	ret = ocfs2_journal_access(handle, inode, bh,
				   OCFS2_JOURNAL_ACCESS_WRITE);
	if (ret < 0) {
		mlog_errno(ret);
1154
		goto out_trans;
1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166
	}

	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);
1167

1168
out_trans:
1169
	ocfs2_commit_trans(osb, handle);
1170 1171 1172 1173 1174
out:
	mlog_exit(ret);
	return ret;
}

1175 1176 1177 1178 1179 1180 1181 1182
/*
 * 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;
1183
	unsigned int extent_flags;
1184 1185 1186 1187 1188 1189 1190
	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) {
1191 1192
		ret = ocfs2_get_clusters(inode, cpos, &phys_cpos, &extent_len,
					 &extent_flags);
1193 1194 1195 1196 1197
		if (ret < 0) {
			mlog_errno(ret);
			goto out;
		}

1198
		if (phys_cpos == 0 || (extent_flags & OCFS2_EXT_UNWRITTEN)) {
1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212
			ret = 1;
			break;
		}

		if (extent_len > clusters)
			extent_len = clusters;

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

1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231
static int ocfs2_write_remove_suid(struct inode *inode)
{
	int ret;
	struct buffer_head *bh = NULL;
	struct ocfs2_inode_info *oi = OCFS2_I(inode);

	ret = ocfs2_read_block(OCFS2_SB(inode->i_sb),
			       oi->ip_blkno, &bh, OCFS2_BH_CACHED, inode);
	if (ret < 0) {
		mlog_errno(ret);
		goto out;
	}

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

1232 1233 1234 1235 1236 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 1282 1283 1284 1285 1286 1287 1288 1289
/*
 * 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;

	/*
	 * 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:
	return ret;
}

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 1336 1337 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 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 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 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521
static int __ocfs2_remove_inode_range(struct inode *inode,
				      struct buffer_head *di_bh,
				      u32 cpos, u32 phys_cpos, u32 len,
				      struct ocfs2_cached_dealloc_ctxt *dealloc)
{
	int ret;
	u64 phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	struct inode *tl_inode = osb->osb_tl_inode;
	handle_t *handle;
	struct ocfs2_alloc_context *meta_ac = NULL;
	struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;

	ret = ocfs2_lock_allocators(inode, di, 0, 1, NULL, &meta_ac);
	if (ret) {
		mlog_errno(ret);
		return ret;
	}

	mutex_lock(&tl_inode->i_mutex);

	if (ocfs2_truncate_log_needs_flush(osb)) {
		ret = __ocfs2_flush_truncate_log(osb);
		if (ret < 0) {
			mlog_errno(ret);
			goto out;
		}
	}

	handle = ocfs2_start_trans(osb, OCFS2_REMOVE_EXTENT_CREDITS);
	if (handle == NULL) {
		ret = -ENOMEM;
		mlog_errno(ret);
		goto out;
	}

	ret = ocfs2_journal_access(handle, inode, di_bh,
				   OCFS2_JOURNAL_ACCESS_WRITE);
	if (ret) {
		mlog_errno(ret);
		goto out;
	}

	ret = ocfs2_remove_extent(inode, di_bh, cpos, len, handle, meta_ac,
				  dealloc);
	if (ret) {
		mlog_errno(ret);
		goto out_commit;
	}

	OCFS2_I(inode)->ip_clusters -= len;
	di->i_clusters = cpu_to_le32(OCFS2_I(inode)->ip_clusters);

	ret = ocfs2_journal_dirty(handle, di_bh);
	if (ret) {
		mlog_errno(ret);
		goto out_commit;
	}

	ret = ocfs2_truncate_log_append(osb, handle, phys_blkno, len);
	if (ret)
		mlog_errno(ret);

out_commit:
	ocfs2_commit_trans(osb, handle);
out:
	mutex_unlock(&tl_inode->i_mutex);

	if (meta_ac)
		ocfs2_free_alloc_context(meta_ac);

	return ret;
}

/*
 * 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);
	if (handle == NULL) {
		ret = -ENOMEM;
		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;

	ocfs2_init_dealloc_ctxt(&dealloc);

	if (byte_len == 0)
		return 0;

	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) {
			ret = __ocfs2_remove_inode_range(inode, di_bh, cpos,
							 phys_cpos, alloc_size,
							 &dealloc);
			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;
}

1522 1523 1524
/*
 * Parts of this function taken from xfs_change_file_space()
 */
M
Mark Fasheh 已提交
1525 1526 1527 1528
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)
1529 1530 1531
{
	int ret;
	s64 llen;
M
Mark Fasheh 已提交
1532
	loff_t size;
1533 1534 1535
	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	struct buffer_head *di_bh = NULL;
	handle_t *handle;
1536
	unsigned long long max_off = inode->i_sb->s_maxbytes;
1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566

	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;
	}

	ret = ocfs2_meta_lock(inode, &di_bh, 1);
	if (ret) {
		mlog_errno(ret);
		goto out_rw_unlock;
	}

	if (inode->i_flags & (S_IMMUTABLE|S_APPEND)) {
		ret = -EPERM;
		goto out_meta_unlock;
	}

	switch (sr->l_whence) {
	case 0: /*SEEK_SET*/
		break;
	case 1: /*SEEK_CUR*/
M
Mark Fasheh 已提交
1567
		sr->l_start += f_pos;
1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586
		break;
	case 2: /*SEEK_END*/
		sr->l_start += i_size_read(inode);
		break;
	default:
		ret = -EINVAL;
		goto out_meta_unlock;
	}
	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;
		goto out_meta_unlock;
	}
M
Mark Fasheh 已提交
1587
	size = sr->l_start + sr->l_len;
1588 1589 1590 1591 1592 1593 1594 1595

	if (cmd == OCFS2_IOC_RESVSP || cmd == OCFS2_IOC_RESVSP64) {
		if (sr->l_len <= 0) {
			ret = -EINVAL;
			goto out_meta_unlock;
		}
	}

M
Mark Fasheh 已提交
1596
	if (file && should_remove_suid(file->f_path.dentry)) {
1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 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
		ret = __ocfs2_write_remove_suid(inode, di_bh);
		if (ret) {
			mlog_errno(ret);
			goto out_meta_unlock;
		}
	}

	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);
		goto out_meta_unlock;
	}

	/*
	 * 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);
		goto out_meta_unlock;
	}

M
Mark Fasheh 已提交
1639 1640 1641
	if (change_size && i_size_read(inode) < size)
		i_size_write(inode, size);

1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659
	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);

out_meta_unlock:
	brelse(di_bh);
	ocfs2_meta_unlock(inode, 1);
out_rw_unlock:
	ocfs2_rw_unlock(inode, 1);

	mutex_unlock(&inode->i_mutex);
out:
	return ret;
}

M
Mark Fasheh 已提交
1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705
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;
	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);;

	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
1706 1707 1708
static int ocfs2_prepare_inode_for_write(struct dentry *dentry,
					 loff_t *ppos,
					 size_t count,
1709 1710
					 int appending,
					 int *direct_io)
1711
{
T
Tiger Yang 已提交
1712 1713
	int ret = 0, meta_level = appending;
	struct inode *inode = dentry->d_inode;
1714 1715 1716 1717 1718 1719 1720 1721 1722
	u32 clusters;
	loff_t newsize, saved_pos;

	/* 
	 * We sample i_size under a read level meta lock to see if our write
	 * is extending the file, if it is we back off and get a write level
	 * meta lock.
	 */
	for(;;) {
1723
		ret = ocfs2_meta_lock(inode, NULL, meta_level);
1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738
		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
1739
		if (should_remove_suid(dentry)) {
1740 1741 1742 1743 1744 1745 1746 1747 1748
			if (meta_level == 0) {
				ocfs2_meta_unlock(inode, meta_level);
				meta_level = 1;
				continue;
			}

			ret = ocfs2_write_remove_suid(inode);
			if (ret < 0) {
				mlog_errno(ret);
T
Tiger Yang 已提交
1749
				goto out_unlock;
1750 1751 1752 1753 1754
			}
		}

		/* 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
1755
		if (appending) {
1756 1757 1758
			saved_pos = i_size_read(inode);
			mlog(0, "O_APPEND: inode->i_size=%llu\n", saved_pos);
		} else {
T
Tiger Yang 已提交
1759
			saved_pos = *ppos;
1760
		}
1761

1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798
		if (ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb))) {
			loff_t end = saved_pos + count;

			/*
			 * Skip the O_DIRECT checks if we don't need
			 * them.
			 */
			if (!direct_io || !(*direct_io))
				break;

			/*
			 * Allowing concurrent direct writes means
			 * i_size changes wouldn't be synchronized, so
			 * one node could wind up truncating another
			 * nodes writes.
			 */
			if (end > i_size_read(inode)) {
				*direct_io = 0;
				break;
			}

			/*
			 * 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);
			break;
		}

1799 1800 1801 1802 1803
		/*
		 * The rest of this loop is concerned with legacy file
		 * systems which don't support sparse files.
		 */

T
Tiger Yang 已提交
1804
		newsize = count + saved_pos;
1805

1806 1807 1808
		mlog(0, "pos=%lld newsize=%lld cursize=%lld\n",
		     (long long) saved_pos, (long long) newsize,
		     (long long) i_size_read(inode));
1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826

		/* No need for a higher level metadata lock if we're
		 * never going past i_size. */
		if (newsize <= i_size_read(inode))
			break;

		if (meta_level == 0) {
			ocfs2_meta_unlock(inode, meta_level);
			meta_level = 1;
			continue;
		}

		spin_lock(&OCFS2_I(inode)->ip_lock);
		clusters = ocfs2_clusters_for_bytes(inode->i_sb, newsize) -
			OCFS2_I(inode)->ip_clusters;
		spin_unlock(&OCFS2_I(inode)->ip_lock);

		mlog(0, "Writing at EOF, may need more allocation: "
1827 1828 1829
		     "i_size = %lld, newsize = %lld, need %u clusters\n",
		     (long long) i_size_read(inode), (long long) newsize,
		     clusters);
1830 1831 1832 1833 1834 1835 1836

		/* We only want to continue the rest of this loop if
		 * our extend will actually require more
		 * allocation. */
		if (!clusters)
			break;

T
Tiger Yang 已提交
1837
		ret = ocfs2_extend_file(inode, NULL, newsize, count);
1838 1839 1840
		if (ret < 0) {
			if (ret != -ENOSPC)
				mlog_errno(ret);
T
Tiger Yang 已提交
1841
			goto out_unlock;
1842 1843 1844 1845
		}
		break;
	}

T
Tiger Yang 已提交
1846 1847 1848 1849
	if (appending)
		*ppos = saved_pos;

out_unlock:
1850
	ocfs2_meta_unlock(inode, meta_level);
T
Tiger Yang 已提交
1851 1852 1853 1854 1855

out:
	return ret;
}

1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875
static inline void
ocfs2_set_next_iovec(const struct iovec **iovp, size_t *basep, size_t bytes)
{
	const struct iovec *iov = *iovp;
	size_t base = *basep;

	do {
		int copy = min(bytes, iov->iov_len - base);

		bytes -= copy;
		base += copy;
		if (iov->iov_len == base) {
			iov++;
			base = 0;
		}
	} while (bytes);
	*iovp = iov;
	*basep = base;
}

1876
static struct page * ocfs2_get_write_source(char **ret_src_buf,
1877 1878 1879 1880
					    const struct iovec *cur_iov,
					    size_t iov_offset)
{
	int ret;
1881
	char *buf = cur_iov->iov_base + iov_offset;
1882
	struct page *src_page = NULL;
1883
	unsigned long off;
1884

1885
	off = (unsigned long)(buf) & ~PAGE_CACHE_MASK;
1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896

	if (!segment_eq(get_fs(), KERNEL_DS)) {
		/*
		 * Pull in the user page. We want to do this outside
		 * of the meta data locks in order to preserve locking
		 * order in case of page fault.
		 */
		ret = get_user_pages(current, current->mm,
				     (unsigned long)buf & PAGE_CACHE_MASK, 1,
				     0, 0, &src_page, NULL);
		if (ret == 1)
1897
			*ret_src_buf = kmap(src_page) + off;
1898 1899 1900
		else
			src_page = ERR_PTR(-EFAULT);
	} else {
1901
		*ret_src_buf = buf;
1902 1903 1904 1905 1906
	}

	return src_page;
}

1907
static void ocfs2_put_write_source(struct page *page)
1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922
{
	if (page) {
		kunmap(page);
		page_cache_release(page);
	}
}

static ssize_t ocfs2_file_buffered_write(struct file *file, loff_t *ppos,
					 const struct iovec *iov,
					 unsigned long nr_segs,
					 size_t count,
					 ssize_t o_direct_written)
{
	int ret = 0;
	ssize_t copied, total = 0;
1923 1924
	size_t iov_offset = 0, bytes;
	loff_t pos;
1925
	const struct iovec *cur_iov = iov;
1926
	struct page *user_page, *page;
1927 1928
	char * uninitialized_var(buf);
	char *dst;
1929
	void *fsdata;
1930 1931 1932 1933 1934 1935 1936

	/*
	 * handle partial DIO write.  Adjust cur_iov if needed.
	 */
	ocfs2_set_next_iovec(&cur_iov, &iov_offset, o_direct_written);

	do {
1937
		pos = *ppos;
1938

1939 1940 1941
		user_page = ocfs2_get_write_source(&buf, cur_iov, iov_offset);
		if (IS_ERR(user_page)) {
			ret = PTR_ERR(user_page);
1942 1943 1944
			goto out;
		}

1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959
		/* Stay within our page boundaries */
		bytes = min((PAGE_CACHE_SIZE - ((unsigned long)pos & ~PAGE_CACHE_MASK)),
			    (PAGE_CACHE_SIZE - ((unsigned long)buf & ~PAGE_CACHE_MASK)));
		/* Stay within the vector boundary */
		bytes = min_t(size_t, bytes, cur_iov->iov_len - iov_offset);
		/* Stay within count */
		bytes = min(bytes, count);

		page = NULL;
		ret = ocfs2_write_begin(file, file->f_mapping, pos, bytes, 0,
					&page, &fsdata);
		if (ret) {
			mlog_errno(ret);
			goto out;
		}
1960

1961 1962 1963 1964 1965
		dst = kmap_atomic(page, KM_USER0);
		memcpy(dst + (pos & (PAGE_CACHE_SIZE - 1)), buf, bytes);
		kunmap_atomic(dst, KM_USER0);
		flush_dcache_page(page);
		ocfs2_put_write_source(user_page);
1966

1967 1968
		copied = ocfs2_write_end(file, file->f_mapping, pos, bytes,
					 bytes, page, fsdata);
1969 1970 1971 1972 1973 1974 1975
		if (copied < 0) {
			mlog_errno(copied);
			ret = copied;
			goto out;
		}

		total += copied;
1976
		*ppos = pos + copied;
1977 1978 1979 1980 1981 1982 1983 1984 1985
		count -= copied;

		ocfs2_set_next_iovec(&cur_iov, &iov_offset, copied);
	} while(count);

out:
	return total ? total : ret;
}

T
Tiger Yang 已提交
1986 1987 1988 1989 1990
static ssize_t ocfs2_file_aio_write(struct kiocb *iocb,
				    const struct iovec *iov,
				    unsigned long nr_segs,
				    loff_t pos)
{
1991 1992 1993 1994 1995 1996 1997 1998 1999 2000
	int ret, direct_io, appending, rw_level, have_alloc_sem  = 0;
	int can_do_direct, sync = 0;
	ssize_t written = 0;
	size_t ocount;		/* original count */
	size_t count;		/* after file limit checks */
	loff_t *ppos = &iocb->ki_pos;
	struct file *file = iocb->ki_filp;
	struct inode *inode = file->f_path.dentry->d_inode;

	mlog_entry("(0x%p, %u, '%.*s')\n", file,
T
Tiger Yang 已提交
2001
		   (unsigned int)nr_segs,
2002 2003
		   file->f_path.dentry->d_name.len,
		   file->f_path.dentry->d_name.name);
T
Tiger Yang 已提交
2004 2005 2006 2007

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

2008
	ret = generic_segment_checks(iov, &nr_segs, &ocount, VERIFY_READ);
2009 2010 2011 2012 2013 2014 2015 2016 2017 2018
	if (ret)
		return ret;

	count = ocount;

	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
2019
	mutex_lock(&inode->i_mutex);
2020 2021

relock:
T
Tiger Yang 已提交
2022
	/* to match setattr's i_mutex -> i_alloc_sem -> rw_lock ordering */
2023
	if (direct_io) {
T
Tiger Yang 已提交
2024
		down_read(&inode->i_alloc_sem);
2025
		have_alloc_sem = 1;
T
Tiger Yang 已提交
2026 2027 2028
	}

	/* concurrent O_DIRECT writes are allowed */
2029
	rw_level = !direct_io;
T
Tiger Yang 已提交
2030 2031 2032
	ret = ocfs2_rw_lock(inode, rw_level);
	if (ret < 0) {
		mlog_errno(ret);
2033
		goto out_sems;
T
Tiger Yang 已提交
2034 2035
	}

2036 2037 2038 2039
	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
2040 2041 2042 2043
	if (ret < 0) {
		mlog_errno(ret);
		goto out;
	}
2044

2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079
	/*
	 * 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;
		sync = 1;
		goto relock;
	}

	if (!sync && ((file->f_flags & O_SYNC) || IS_SYNC(inode)))
		sync = 1;

	/*
	 * XXX: Is it ok to execute these checks a second time?
	 */
	ret = generic_write_checks(file, ppos, &count, S_ISBLK(inode->i_mode));
	if (ret)
		goto out;

	/*
	 * Set pos so that sync_page_range_nolock() below understands
	 * where to start from. We might've moved it around via the
	 * calls above. The range we want to actually sync starts from
	 * *ppos here.
	 *
	 */
	pos = *ppos;

2080
	/* communicate with ocfs2_dio_end_io */
2081
	ocfs2_iocb_set_rw_locked(iocb, rw_level);
2082

2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099
	if (direct_io) {
		written = generic_file_direct_write(iocb, iov, &nr_segs, *ppos,
						    ppos, count, ocount);
		if (written < 0) {
			ret = written;
			goto out_dio;
		}
	} else {
		written = ocfs2_file_buffered_write(file, ppos, iov, nr_segs,
						    count, written);
		if (written < 0) {
			ret = written;
			if (ret != -EFAULT || ret != -ENOSPC)
				mlog_errno(ret);
			goto out;
		}
	}
2100

2101
out_dio:
2102
	/* buffered aio wouldn't have proper lock coverage today */
2103
	BUG_ON(ret == -EIOCBQUEUED && !(file->f_flags & O_DIRECT));
2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120

	/* 
	 * 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:
2121 2122 2123 2124
	if (rw_level != -1)
		ocfs2_rw_unlock(inode, rw_level);

out_sems:
2125 2126
	if (have_alloc_sem)
		up_read(&inode->i_alloc_sem);
2127 2128 2129 2130 2131 2132 2133 2134 2135

	if (written > 0 && sync) {
		ssize_t err;

		err = sync_page_range_nolock(inode, file->f_mapping, pos, count);
		if (err < 0)
			written = err;
	}

2136
	mutex_unlock(&inode->i_mutex);
2137 2138

	mlog_exit(ret);
2139
	return written ? written : ret;
2140 2141
}

M
Mark Fasheh 已提交
2142 2143 2144 2145
static int ocfs2_splice_write_actor(struct pipe_inode_info *pipe,
				    struct pipe_buffer *buf,
				    struct splice_desc *sd)
{
2146
	int ret, count;
M
Mark Fasheh 已提交
2147
	ssize_t copied = 0;
2148 2149 2150 2151 2152
	struct file *file = sd->u.file;
	unsigned int offset;
	struct page *page = NULL;
	void *fsdata;
	char *src, *dst;
M
Mark Fasheh 已提交
2153

2154
	ret = buf->ops->confirm(pipe, buf);
M
Mark Fasheh 已提交
2155 2156 2157
	if (ret)
		goto out;

2158
	offset = sd->pos & ~PAGE_CACHE_MASK;
M
Mark Fasheh 已提交
2159
	count = sd->len;
2160 2161
	if (count + offset > PAGE_CACHE_SIZE)
		count = PAGE_CACHE_SIZE - offset;
M
Mark Fasheh 已提交
2162

2163 2164 2165 2166 2167 2168
	ret = ocfs2_write_begin(file, file->f_mapping, sd->pos, count, 0,
				&page, &fsdata);
	if (ret) {
		mlog_errno(ret);
		goto out;
	}
M
Mark Fasheh 已提交
2169

2170 2171 2172
	src = buf->ops->map(pipe, buf, 1);
	dst = kmap_atomic(page, KM_USER1);
	memcpy(dst + offset, src + buf->offset, count);
J
Jens Axboe 已提交
2173
	kunmap_atomic(dst, KM_USER1);
2174
	buf->ops->unmap(pipe, buf, src);
M
Mark Fasheh 已提交
2175

2176 2177 2178 2179 2180 2181 2182
	copied = ocfs2_write_end(file, file->f_mapping, sd->pos, count, count,
				 page, fsdata);
	if (copied < 0) {
		mlog_errno(copied);
		ret = copied;
		goto out;
	}
M
Mark Fasheh 已提交
2183 2184
out:

2185
	return copied ? copied : ret;
M
Mark Fasheh 已提交
2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196
}

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, err;
	struct address_space *mapping = out->f_mapping;
	struct inode *inode = mapping->host;
J
Jens Axboe 已提交
2197 2198 2199 2200
	struct splice_desc sd = {
		.total_len = len,
		.flags = flags,
		.pos = *ppos,
2201
		.u.file = out,
J
Jens Axboe 已提交
2202 2203 2204
	};

	ret = __splice_from_pipe(pipe, &sd, ocfs2_splice_write_actor);
M
Mark Fasheh 已提交
2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218
	if (ret > 0) {
		*ppos += ret;

		if (unlikely((out->f_flags & O_SYNC) || IS_SYNC(inode))) {
			err = generic_osync_inode(inode, mapping,
						  OSYNC_METADATA|OSYNC_DATA);
			if (err)
				ret = err;
		}
	}

	return ret;
}

T
Tiger Yang 已提交
2219 2220 2221 2222 2223 2224 2225
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
2226
	struct inode *inode = out->f_path.dentry->d_inode;
T
Tiger Yang 已提交
2227 2228 2229

	mlog_entry("(0x%p, 0x%p, %u, '%.*s')\n", out, pipe,
		   (unsigned int)len,
J
Josef Sipek 已提交
2230 2231
		   out->f_path.dentry->d_name.len,
		   out->f_path.dentry->d_name.name);
T
Tiger Yang 已提交
2232 2233 2234 2235 2236 2237 2238 2239 2240

	inode_double_lock(inode, pipe->inode);

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

2241 2242
	ret = ocfs2_prepare_inode_for_write(out->f_path.dentry, ppos, len, 0,
					    NULL);
T
Tiger Yang 已提交
2243 2244 2245 2246 2247 2248
	if (ret < 0) {
		mlog_errno(ret);
		goto out_unlock;
	}

	/* ok, we're done with i_size and alloc work */
M
Mark Fasheh 已提交
2249
	ret = __ocfs2_file_splice_write(pipe, out, ppos, len, flags);
T
Tiger Yang 已提交
2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266

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
2267
	struct inode *inode = in->f_path.dentry->d_inode;
T
Tiger Yang 已提交
2268 2269 2270

	mlog_entry("(0x%p, 0x%p, %u, '%.*s')\n", in, pipe,
		   (unsigned int)len,
J
Josef Sipek 已提交
2271 2272
		   in->f_path.dentry->d_name.len,
		   in->f_path.dentry->d_name.name);
T
Tiger Yang 已提交
2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290

	/*
	 * See the comment in ocfs2_file_aio_read()
	 */
	ret = ocfs2_meta_lock(inode, NULL, 0);
	if (ret < 0) {
		mlog_errno(ret);
		goto bail;
	}
	ocfs2_meta_unlock(inode, 0);

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

bail:
	mlog_exit(ret);
	return ret;
}

2291
static ssize_t ocfs2_file_aio_read(struct kiocb *iocb,
2292 2293
				   const struct iovec *iov,
				   unsigned long nr_segs,
2294 2295
				   loff_t pos)
{
2296
	int ret = 0, rw_level = -1, have_alloc_sem = 0, lock_level = 0;
2297
	struct file *filp = iocb->ki_filp;
J
Josef Sipek 已提交
2298
	struct inode *inode = filp->f_path.dentry->d_inode;
2299

2300 2301
	mlog_entry("(0x%p, %u, '%.*s')\n", filp,
		   (unsigned int)nr_segs,
J
Josef Sipek 已提交
2302 2303
		   filp->f_path.dentry->d_name.len,
		   filp->f_path.dentry->d_name.name);
2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325

	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 */
2326
		ocfs2_iocb_set_rw_locked(iocb, rw_level);
2327 2328
	}

2329 2330 2331 2332 2333 2334 2335 2336 2337
	/*
	 * 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. 
	 */
2338
	ret = ocfs2_meta_lock_atime(inode, filp->f_vfsmnt, &lock_level);
2339 2340 2341 2342
	if (ret < 0) {
		mlog_errno(ret);
		goto bail;
	}
2343
	ocfs2_meta_unlock(inode, lock_level);
2344

2345
	ret = generic_file_aio_read(iocb, iov, nr_segs, iocb->ki_pos);
2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367
	if (ret == -EINVAL)
		mlog(ML_ERROR, "generic_file_aio_read returned -EINVAL\n");

	/* 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;
}

2368
const struct inode_operations ocfs2_file_iops = {
2369 2370
	.setattr	= ocfs2_setattr,
	.getattr	= ocfs2_getattr,
T
Tiger Yang 已提交
2371
	.permission	= ocfs2_permission,
M
Mark Fasheh 已提交
2372
	.fallocate	= ocfs2_fallocate,
2373 2374
};

2375
const struct inode_operations ocfs2_special_file_iops = {
2376 2377
	.setattr	= ocfs2_setattr,
	.getattr	= ocfs2_getattr,
T
Tiger Yang 已提交
2378
	.permission	= ocfs2_permission,
2379 2380
};

2381
const struct file_operations ocfs2_fops = {
2382 2383 2384 2385 2386 2387 2388 2389
	.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,
H
Herbert Poetzl 已提交
2390
	.ioctl		= ocfs2_ioctl,
M
Mark Fasheh 已提交
2391 2392 2393
#ifdef CONFIG_COMPAT
	.compat_ioctl   = ocfs2_compat_ioctl,
#endif
T
Tiger Yang 已提交
2394 2395
	.splice_read	= ocfs2_file_splice_read,
	.splice_write	= ocfs2_file_splice_write,
2396 2397
};

2398
const struct file_operations ocfs2_dops = {
2399 2400 2401
	.read		= generic_read_dir,
	.readdir	= ocfs2_readdir,
	.fsync		= ocfs2_sync_file,
H
Herbert Poetzl 已提交
2402
	.ioctl		= ocfs2_ioctl,
M
Mark Fasheh 已提交
2403 2404 2405
#ifdef CONFIG_COMPAT
	.compat_ioctl   = ocfs2_compat_ioctl,
#endif
2406
};