file.c 53.2 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"
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#include "locks.h"
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#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);
}

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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;
	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_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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	/*
	 * 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;
}

/*
 * 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;
	}

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	status = __ocfs2_claim_clusters(osb, handle, data_ac, 1,
					clusters_to_add, &bit_off, &num_bits);
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	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)
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{
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	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",
629
	     (unsigned long long)OCFS2_I(inode)->ip_blkno, i_size_read(inode),
630
	     le32_to_cpu(di->i_clusters), clusters_to_add, extents_to_split);
631 632 633 634 635 636 637 638 639 640 641 642 643 644 645

	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.
	 *
646
	 * Most of the time we'll only be seeing this 1 cluster at a time
647
	 * anyway.
648 649 650
	 *
	 * Always lock for any unwritten extents - we might want to
	 * add blocks during a split.
651 652
	 */
	if (!num_free_extents ||
653
	    (ocfs2_sparse_alloc(osb) && num_free_extents < max_recs_needed)) {
654 655 656 657 658 659 660 661
		ret = ocfs2_reserve_new_metadata(osb, di, meta_ac);
		if (ret < 0) {
			if (ret != -ENOSPC)
				mlog_errno(ret);
			goto out;
		}
	}

662 663 664
	if (clusters_to_add == 0)
		goto out;

665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686
	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;
}

687 688
static int __ocfs2_extend_allocation(struct inode *inode, u32 logical_start,
				     u32 clusters_to_add, int mark_unwritten)
689 690 691
{
	int status = 0;
	int restart_func = 0;
692
	int credits;
693
	u32 prev_clusters;
694 695
	struct buffer_head *bh = NULL;
	struct ocfs2_dinode *fe = NULL;
696
	handle_t *handle = NULL;
697 698 699 700 701 702 703
	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
704 705 706 707
	/*
	 * This function only exists for file systems which don't
	 * support holes.
	 */
708
	BUG_ON(mark_unwritten && !ocfs2_sparse_alloc(osb));
M
Mark Fasheh 已提交
709

710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726
	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);

727
	status = ocfs2_lock_allocators(inode, fe, clusters_to_add, 0, &data_ac,
728 729 730 731 732 733
				       &meta_ac);
	if (status) {
		mlog_errno(status);
		goto leave;
	}

734
	credits = ocfs2_calc_extend_credits(osb->sb, fe, clusters_to_add);
735
	handle = ocfs2_start_trans(osb, credits);
736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757
	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
758
					    &logical_start,
759
					    clusters_to_add,
760
					    mark_unwritten,
761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793
					    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);
794
			status = ocfs2_extend_trans(handle, credits);
795 796 797 798 799 800 801 802 803 804 805
			if (status < 0) {
				/* handle still has to be committed at
				 * this point. */
				status = -ENOMEM;
				mlog_errno(status);
				goto leave;
			}
			goto restarted_transaction;
		}
	}

806
	mlog(0, "fe: i_clusters = %u, i_size=%llu\n",
807 808
	     le32_to_cpu(fe->i_clusters),
	     (unsigned long long)le64_to_cpu(fe->i_size));
809 810 811 812 813
	mlog(0, "inode: ip_clusters=%u, i_size=%lld\n",
	     OCFS2_I(inode)->ip_clusters, i_size_read(inode));

leave:
	if (handle) {
814
		ocfs2_commit_trans(osb, handle);
815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839
		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;
}

/* 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
840 841
 * worry about recursive locking in ->prepare_write() and
 * ->commit_write(). */
842 843 844 845 846 847 848
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;
849
	handle_t *handle = NULL;
850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868
	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;
	}

869
	ret = ocfs2_prepare_write_nolock(inode, page, offset, offset);
870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892
	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)
893
		ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916
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;
917 918 919 920 921 922

		/*
		 * Very large extends have the potential to lock up
		 * the cpu for extended periods of time.
		 */
		cond_resched();
923 924 925 926 927 928
	}

out:
	return ret;
}

929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962
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;
}

963 964
static int ocfs2_extend_file(struct inode *inode,
			     struct buffer_head *di_bh,
965
			     u64 new_i_size)
966
{
M
Mark Fasheh 已提交
967
	int ret = 0;
M
Mark Fasheh 已提交
968
	struct ocfs2_inode_info *oi = OCFS2_I(inode);
969

970
	BUG_ON(!di_bh);
971

972 973 974 975 976 977 978 979
	/* 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
980 981 982 983 984 985 986 987 988 989 990
	/*
	 * 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)))
991
		goto out_update_size;
992

993
	/*
994 995 996 997
	 * 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.
998
	 */
M
Mark Fasheh 已提交
999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015
	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
1016
			goto out;
M
Mark Fasheh 已提交
1017 1018 1019 1020 1021 1022 1023
		}
	}

	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);
1024

1025 1026
	if (ret < 0) {
		mlog_errno(ret);
M
Mark Fasheh 已提交
1027
		goto out;
1028 1029
	}

1030
out_update_size:
1031 1032 1033
	ret = ocfs2_simple_size_update(inode, di_bh, new_i_size);
	if (ret < 0)
		mlog_errno(ret);
1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045

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;
1046
	handle_t *handle = NULL;
1047 1048 1049 1050 1051 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

	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;
		}
	}

M
Mark Fasheh 已提交
1082
	status = ocfs2_inode_lock(inode, &bh, 1);
1083 1084 1085 1086 1087 1088 1089
	if (status < 0) {
		if (status != -ENOENT)
			mlog_errno(status);
		goto bail_unlock_rw;
	}

	if (size_change && attr->ia_size != i_size_read(inode)) {
1090 1091 1092 1093 1094
		if (attr->ia_size > sb->s_maxbytes) {
			status = -EFBIG;
			goto bail_unlock;
		}

1095 1096 1097
		if (i_size_read(inode) > attr->ia_size)
			status = ocfs2_truncate_file(inode, bh, attr->ia_size);
		else
1098
			status = ocfs2_extend_file(inode, bh, attr->ia_size);
1099 1100 1101 1102 1103 1104 1105 1106
		if (status < 0) {
			if (status != -ENOSPC)
				mlog_errno(status);
			status = -ENOSPC;
			goto bail_unlock;
		}
	}

1107
	handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1108 1109 1110 1111 1112 1113
	if (IS_ERR(handle)) {
		status = PTR_ERR(handle);
		mlog_errno(status);
		goto bail_unlock;
	}

M
Mark Fasheh 已提交
1114 1115 1116 1117 1118 1119 1120
	/*
	 * 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.
	 */
1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131
	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:
1132
	ocfs2_commit_trans(osb, handle);
1133
bail_unlock:
M
Mark Fasheh 已提交
1134
	ocfs2_inode_unlock(inode, 1);
1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174
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
1175 1176 1177 1178 1179 1180
int ocfs2_permission(struct inode *inode, int mask, struct nameidata *nd)
{
	int ret;

	mlog_entry_void();

M
Mark Fasheh 已提交
1181
	ret = ocfs2_inode_lock(inode, NULL, 0);
T
Tiger Yang 已提交
1182
	if (ret) {
M
Mark Fasheh 已提交
1183 1184
		if (ret != -ENOENT)
			mlog_errno(ret);
T
Tiger Yang 已提交
1185 1186 1187 1188 1189
		goto out;
	}

	ret = generic_permission(inode, mask, NULL);

M
Mark Fasheh 已提交
1190
	ocfs2_inode_unlock(inode, 0);
T
Tiger Yang 已提交
1191 1192 1193 1194 1195
out:
	mlog_exit(ret);
	return ret;
}

1196 1197
static int __ocfs2_write_remove_suid(struct inode *inode,
				     struct buffer_head *bh)
1198 1199
{
	int ret;
1200
	handle_t *handle;
1201 1202 1203
	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	struct ocfs2_dinode *di;

1204
	mlog_entry("(Inode %llu, mode 0%o)\n",
1205
		   (unsigned long long)OCFS2_I(inode)->ip_blkno, inode->i_mode);
1206

1207
	handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1208 1209 1210 1211 1212 1213 1214 1215 1216 1217
	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);
1218
		goto out_trans;
1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230
	}

	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);
1231

1232
out_trans:
1233
	ocfs2_commit_trans(osb, handle);
1234 1235 1236 1237 1238
out:
	mlog_exit(ret);
	return ret;
}

1239 1240 1241 1242 1243 1244 1245 1246
/*
 * 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;
1247
	unsigned int extent_flags;
1248 1249 1250 1251 1252 1253 1254
	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) {
1255 1256
		ret = ocfs2_get_clusters(inode, cpos, &phys_cpos, &extent_len,
					 &extent_flags);
1257 1258 1259 1260 1261
		if (ret < 0) {
			mlog_errno(ret);
			goto out;
		}

1262
		if (phys_cpos == 0 || (extent_flags & OCFS2_EXT_UNWRITTEN)) {
1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276
			ret = 1;
			break;
		}

		if (extent_len > clusters)
			extent_len = clusters;

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

1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295
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;
}

1296 1297 1298 1299 1300 1301 1302 1303 1304 1305
/*
 * 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
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
	u64 end = start + len;
	struct buffer_head *di_bh = NULL;

	if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
		ret = ocfs2_read_block(OCFS2_SB(inode->i_sb),
				       OCFS2_I(inode)->ip_blkno, &di_bh,
				       OCFS2_BH_CACHED, inode);
		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;
		}
	}
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

	/*
	 * 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:
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Mark Fasheh 已提交
1376 1377

	brelse(di_bh);
1378 1379 1380
	return ret;
}

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 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552
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;
1553
	struct address_space *mapping = inode->i_mapping;
1554 1555 1556 1557 1558 1559

	ocfs2_init_dealloc_ctxt(&dealloc);

	if (byte_len == 0)
		return 0;

M
Mark Fasheh 已提交
1560 1561
	if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
		ret = ocfs2_truncate_inline(inode, di_bh, byte_start,
1562 1563
					    byte_start + byte_len, 0);
		if (ret) {
M
Mark Fasheh 已提交
1564
			mlog_errno(ret);
1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575
			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
1576 1577
	}

1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 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
	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;
}

1632 1633 1634
/*
 * Parts of this function taken from xfs_change_file_space()
 */
M
Mark Fasheh 已提交
1635 1636 1637 1638
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)
1639 1640 1641
{
	int ret;
	s64 llen;
M
Mark Fasheh 已提交
1642
	loff_t size;
1643 1644 1645
	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	struct buffer_head *di_bh = NULL;
	handle_t *handle;
1646
	unsigned long long max_off = inode->i_sb->s_maxbytes;
1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661

	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
1662
	ret = ocfs2_inode_lock(inode, &di_bh, 1);
1663 1664 1665 1666 1667 1668 1669
	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
1670
		goto out_inode_unlock;
1671 1672 1673 1674 1675 1676
	}

	switch (sr->l_whence) {
	case 0: /*SEEK_SET*/
		break;
	case 1: /*SEEK_CUR*/
M
Mark Fasheh 已提交
1677
		sr->l_start += f_pos;
1678 1679 1680 1681 1682 1683
		break;
	case 2: /*SEEK_END*/
		sr->l_start += i_size_read(inode);
		break;
	default:
		ret = -EINVAL;
M
Mark Fasheh 已提交
1684
		goto out_inode_unlock;
1685 1686 1687 1688 1689 1690 1691 1692 1693 1694
	}
	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
1695
		goto out_inode_unlock;
1696
	}
M
Mark Fasheh 已提交
1697
	size = sr->l_start + sr->l_len;
1698 1699 1700 1701

	if (cmd == OCFS2_IOC_RESVSP || cmd == OCFS2_IOC_RESVSP64) {
		if (sr->l_len <= 0) {
			ret = -EINVAL;
M
Mark Fasheh 已提交
1702
			goto out_inode_unlock;
1703 1704 1705
		}
	}

M
Mark Fasheh 已提交
1706
	if (file && should_remove_suid(file->f_path.dentry)) {
1707 1708 1709
		ret = __ocfs2_write_remove_suid(inode, di_bh);
		if (ret) {
			mlog_errno(ret);
M
Mark Fasheh 已提交
1710
			goto out_inode_unlock;
1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735
		}
	}

	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
1736
		goto out_inode_unlock;
1737 1738 1739 1740 1741 1742 1743 1744 1745
	}

	/*
	 * 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
1746
		goto out_inode_unlock;
1747 1748
	}

M
Mark Fasheh 已提交
1749 1750 1751
	if (change_size && i_size_read(inode) < size)
		i_size_write(inode, size);

1752 1753 1754 1755 1756 1757 1758
	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
1759
out_inode_unlock:
1760
	brelse(di_bh);
M
Mark Fasheh 已提交
1761
	ocfs2_inode_unlock(inode, 1);
1762 1763 1764 1765 1766 1767 1768 1769
out_rw_unlock:
	ocfs2_rw_unlock(inode, 1);

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

M
Mark Fasheh 已提交
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 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815
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
1816 1817 1818
static int ocfs2_prepare_inode_for_write(struct dentry *dentry,
					 loff_t *ppos,
					 size_t count,
1819 1820
					 int appending,
					 int *direct_io)
1821
{
1822
	int ret = 0, meta_level = 0;
T
Tiger Yang 已提交
1823
	struct inode *inode = dentry->d_inode;
1824
	loff_t saved_pos, end;
1825 1826

	/* 
1827 1828
	 * We start with a read level meta lock and only jump to an ex
	 * if we need to make modifications here.
1829 1830
	 */
	for(;;) {
M
Mark Fasheh 已提交
1831
		ret = ocfs2_inode_lock(inode, NULL, meta_level);
1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846
		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
1847
		if (should_remove_suid(dentry)) {
1848
			if (meta_level == 0) {
M
Mark Fasheh 已提交
1849
				ocfs2_inode_unlock(inode, meta_level);
1850 1851 1852 1853 1854 1855 1856
				meta_level = 1;
				continue;
			}

			ret = ocfs2_write_remove_suid(inode);
			if (ret < 0) {
				mlog_errno(ret);
T
Tiger Yang 已提交
1857
				goto out_unlock;
1858 1859 1860 1861 1862
			}
		}

		/* 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
1863
		if (appending) {
1864 1865 1866
			saved_pos = i_size_read(inode);
			mlog(0, "O_APPEND: inode->i_size=%llu\n", saved_pos);
		} else {
T
Tiger Yang 已提交
1867
			saved_pos = *ppos;
1868
		}
1869

1870
		end = saved_pos + count;
1871

1872 1873 1874 1875 1876
		/*
		 * Skip the O_DIRECT checks if we don't need
		 * them.
		 */
		if (!direct_io || !(*direct_io))
1877 1878
			break;

M
Mark Fasheh 已提交
1879 1880 1881 1882 1883 1884 1885 1886 1887
		/*
		 * 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;
		}

1888
		/*
1889 1890 1891 1892
		 * Allowing concurrent direct writes means
		 * i_size changes wouldn't be synchronized, so
		 * one node could wind up truncating another
		 * nodes writes.
1893
		 */
1894 1895
		if (end > i_size_read(inode)) {
			*direct_io = 0;
1896 1897 1898
			break;
		}

1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910
		/*
		 * 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);
1911 1912 1913
		break;
	}

T
Tiger Yang 已提交
1914 1915 1916 1917
	if (appending)
		*ppos = saved_pos;

out_unlock:
M
Mark Fasheh 已提交
1918
	ocfs2_inode_unlock(inode, meta_level);
T
Tiger Yang 已提交
1919 1920 1921 1922 1923 1924 1925 1926 1927 1928

out:
	return ret;
}

static ssize_t ocfs2_file_aio_write(struct kiocb *iocb,
				    const struct iovec *iov,
				    unsigned long nr_segs,
				    loff_t pos)
{
1929
	int ret, direct_io, appending, rw_level, have_alloc_sem  = 0;
N
Nick Piggin 已提交
1930
	int can_do_direct;
1931 1932 1933
	ssize_t written = 0;
	size_t ocount;		/* original count */
	size_t count;		/* after file limit checks */
M
Mark Fasheh 已提交
1934 1935
	loff_t old_size, *ppos = &iocb->ki_pos;
	u32 old_clusters;
1936 1937
	struct file *file = iocb->ki_filp;
	struct inode *inode = file->f_path.dentry->d_inode;
M
Mark Fasheh 已提交
1938
	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1939 1940

	mlog_entry("(0x%p, %u, '%.*s')\n", file,
T
Tiger Yang 已提交
1941
		   (unsigned int)nr_segs,
1942 1943
		   file->f_path.dentry->d_name.len,
		   file->f_path.dentry->d_name.name);
T
Tiger Yang 已提交
1944 1945 1946 1947

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

1948 1949 1950 1951 1952
	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
1953
	mutex_lock(&inode->i_mutex);
1954 1955

relock:
T
Tiger Yang 已提交
1956
	/* to match setattr's i_mutex -> i_alloc_sem -> rw_lock ordering */
1957
	if (direct_io) {
T
Tiger Yang 已提交
1958
		down_read(&inode->i_alloc_sem);
1959
		have_alloc_sem = 1;
T
Tiger Yang 已提交
1960 1961 1962
	}

	/* concurrent O_DIRECT writes are allowed */
1963
	rw_level = !direct_io;
T
Tiger Yang 已提交
1964 1965 1966
	ret = ocfs2_rw_lock(inode, rw_level);
	if (ret < 0) {
		mlog_errno(ret);
1967
		goto out_sems;
T
Tiger Yang 已提交
1968 1969
	}

1970 1971 1972 1973
	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
1974 1975 1976 1977
	if (ret < 0) {
		mlog_errno(ret);
		goto out;
	}
1978

1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993
	/*
	 * 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
1994 1995 1996 1997 1998 1999 2000
	/*
	 * 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;

2001
	/* communicate with ocfs2_dio_end_io */
2002
	ocfs2_iocb_set_rw_locked(iocb, rw_level);
2003

2004
	if (direct_io) {
N
Nick Piggin 已提交
2005 2006 2007 2008 2009 2010 2011 2012 2013 2014
		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;

2015 2016 2017 2018 2019 2020 2021
		written = generic_file_direct_write(iocb, iov, &nr_segs, *ppos,
						    ppos, count, ocount);
		if (written < 0) {
			ret = written;
			goto out_dio;
		}
	} else {
N
Nick Piggin 已提交
2022 2023
		written = generic_file_aio_write_nolock(iocb, iov, nr_segs,
							*ppos);
2024
	}
2025

2026
out_dio:
2027
	/* buffered aio wouldn't have proper lock coverage today */
2028
	BUG_ON(ret == -EIOCBQUEUED && !(file->f_flags & O_DIRECT));
2029

M
Mark Fasheh 已提交
2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044
	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) {
			ret = journal_force_commit(osb->journal->j_journal);
			if (ret < 0)
				written = ret;
		}
	}

2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060
	/* 
	 * 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:
2061 2062 2063 2064
	if (rw_level != -1)
		ocfs2_rw_unlock(inode, rw_level);

out_sems:
2065 2066
	if (have_alloc_sem)
		up_read(&inode->i_alloc_sem);
2067

2068
	mutex_unlock(&inode->i_mutex);
2069 2070

	mlog_exit(ret);
2071
	return written ? written : ret;
2072 2073
}

T
Tiger Yang 已提交
2074 2075 2076 2077 2078 2079 2080
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
2081
	struct inode *inode = out->f_path.dentry->d_inode;
T
Tiger Yang 已提交
2082 2083 2084

	mlog_entry("(0x%p, 0x%p, %u, '%.*s')\n", out, pipe,
		   (unsigned int)len,
J
Josef Sipek 已提交
2085 2086
		   out->f_path.dentry->d_name.len,
		   out->f_path.dentry->d_name.name);
T
Tiger Yang 已提交
2087 2088 2089 2090 2091 2092 2093 2094 2095

	inode_double_lock(inode, pipe->inode);

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

2096 2097
	ret = ocfs2_prepare_inode_for_write(out->f_path.dentry, ppos, len, 0,
					    NULL);
T
Tiger Yang 已提交
2098 2099 2100 2101 2102
	if (ret < 0) {
		mlog_errno(ret);
		goto out_unlock;
	}

N
Nick Piggin 已提交
2103
	ret = generic_file_splice_write_nolock(pipe, out, ppos, len, flags);
T
Tiger Yang 已提交
2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120

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
2121
	struct inode *inode = in->f_path.dentry->d_inode;
T
Tiger Yang 已提交
2122 2123 2124

	mlog_entry("(0x%p, 0x%p, %u, '%.*s')\n", in, pipe,
		   (unsigned int)len,
J
Josef Sipek 已提交
2125 2126
		   in->f_path.dentry->d_name.len,
		   in->f_path.dentry->d_name.name);
T
Tiger Yang 已提交
2127 2128 2129 2130

	/*
	 * See the comment in ocfs2_file_aio_read()
	 */
M
Mark Fasheh 已提交
2131
	ret = ocfs2_inode_lock(inode, NULL, 0);
T
Tiger Yang 已提交
2132 2133 2134 2135
	if (ret < 0) {
		mlog_errno(ret);
		goto bail;
	}
M
Mark Fasheh 已提交
2136
	ocfs2_inode_unlock(inode, 0);
T
Tiger Yang 已提交
2137 2138 2139 2140 2141 2142 2143 2144

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

bail:
	mlog_exit(ret);
	return ret;
}

2145
static ssize_t ocfs2_file_aio_read(struct kiocb *iocb,
2146 2147
				   const struct iovec *iov,
				   unsigned long nr_segs,
2148 2149
				   loff_t pos)
{
2150
	int ret = 0, rw_level = -1, have_alloc_sem = 0, lock_level = 0;
2151
	struct file *filp = iocb->ki_filp;
J
Josef Sipek 已提交
2152
	struct inode *inode = filp->f_path.dentry->d_inode;
2153

2154 2155
	mlog_entry("(0x%p, %u, '%.*s')\n", filp,
		   (unsigned int)nr_segs,
J
Josef Sipek 已提交
2156 2157
		   filp->f_path.dentry->d_name.len,
		   filp->f_path.dentry->d_name.name);
2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179

	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 */
2180
		ocfs2_iocb_set_rw_locked(iocb, rw_level);
2181 2182
	}

2183 2184 2185 2186 2187 2188 2189 2190 2191
	/*
	 * 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
2192
	ret = ocfs2_inode_lock_atime(inode, filp->f_vfsmnt, &lock_level);
2193 2194 2195 2196
	if (ret < 0) {
		mlog_errno(ret);
		goto bail;
	}
M
Mark Fasheh 已提交
2197
	ocfs2_inode_unlock(inode, lock_level);
2198

2199
	ret = generic_file_aio_read(iocb, iov, nr_segs, iocb->ki_pos);
2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221
	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;
}

2222
const struct inode_operations ocfs2_file_iops = {
2223 2224
	.setattr	= ocfs2_setattr,
	.getattr	= ocfs2_getattr,
T
Tiger Yang 已提交
2225
	.permission	= ocfs2_permission,
M
Mark Fasheh 已提交
2226
	.fallocate	= ocfs2_fallocate,
2227 2228
};

2229
const struct inode_operations ocfs2_special_file_iops = {
2230 2231
	.setattr	= ocfs2_setattr,
	.getattr	= ocfs2_getattr,
T
Tiger Yang 已提交
2232
	.permission	= ocfs2_permission,
2233 2234
};

2235
const struct file_operations ocfs2_fops = {
J
Jan Kara 已提交
2236
	.llseek		= generic_file_llseek,
2237 2238 2239 2240 2241 2242 2243 2244
	.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
2245
	.ioctl		= ocfs2_ioctl,
M
Mark Fasheh 已提交
2246 2247 2248
#ifdef CONFIG_COMPAT
	.compat_ioctl   = ocfs2_compat_ioctl,
#endif
2249
	.flock		= ocfs2_flock,
T
Tiger Yang 已提交
2250 2251
	.splice_read	= ocfs2_file_splice_read,
	.splice_write	= ocfs2_file_splice_write,
2252 2253
};

2254
const struct file_operations ocfs2_dops = {
J
Jan Kara 已提交
2255
	.llseek		= generic_file_llseek,
2256 2257 2258
	.read		= generic_read_dir,
	.readdir	= ocfs2_readdir,
	.fsync		= ocfs2_sync_file,
2259 2260
	.release	= ocfs2_dir_release,
	.open		= ocfs2_dir_open,
H
Herbert Poetzl 已提交
2261
	.ioctl		= ocfs2_ioctl,
M
Mark Fasheh 已提交
2262 2263 2264
#ifdef CONFIG_COMPAT
	.compat_ioctl   = ocfs2_compat_ioctl,
#endif
2265
	.flock		= ocfs2_flock,
2266
};