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/*
* Copyright (C) 2016 Oracle. All Rights Reserved.
*
* Author: Darrick J. Wong <darrick.wong@oracle.com>
*
* 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 would 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 the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_shared.h"
#include "xfs_format.h"
#include "xfs_log_format.h"
#include "xfs_trans_resv.h"
#include "xfs_mount.h"
#include "xfs_defer.h"
#include "xfs_trans.h"
#include "xfs_trans_priv.h"
#include "xfs_rmap_item.h"
#include "xfs_alloc.h"
#include "xfs_rmap.h"
/*
* This routine is called to allocate an "rmap update intent"
* log item that will hold nextents worth of extents. The
* caller must use all nextents extents, because we are not
* flexible about this at all.
*/
struct xfs_rui_log_item *
xfs_trans_get_rui(
struct xfs_trans *tp,
uint nextents)
{
struct xfs_rui_log_item *ruip;
ASSERT(tp != NULL);
ASSERT(nextents > 0);
ruip = xfs_rui_init(tp->t_mountp, nextents);
ASSERT(ruip != NULL);
/*
* Get a log_item_desc to point at the new item.
*/
xfs_trans_add_item(tp, &ruip->rui_item);
return ruip;
}
/* Set the map extent flags for this reverse mapping. */
static void
xfs_trans_set_rmap_flags(
struct xfs_map_extent *rmap,
enum xfs_rmap_intent_type type,
int whichfork,
xfs_exntst_t state)
{
rmap->me_flags = 0;
if (state == XFS_EXT_UNWRITTEN)
rmap->me_flags |= XFS_RMAP_EXTENT_UNWRITTEN;
if (whichfork == XFS_ATTR_FORK)
rmap->me_flags |= XFS_RMAP_EXTENT_ATTR_FORK;
switch (type) {
case XFS_RMAP_MAP:
rmap->me_flags |= XFS_RMAP_EXTENT_MAP;
break;
case XFS_RMAP_UNMAP:
rmap->me_flags |= XFS_RMAP_EXTENT_UNMAP;
break;
case XFS_RMAP_CONVERT:
rmap->me_flags |= XFS_RMAP_EXTENT_CONVERT;
break;
case XFS_RMAP_ALLOC:
rmap->me_flags |= XFS_RMAP_EXTENT_ALLOC;
break;
case XFS_RMAP_FREE:
rmap->me_flags |= XFS_RMAP_EXTENT_FREE;
break;
default:
ASSERT(0);
}
}
/*
* This routine is called to indicate that the described reverse
* mapping is to be logged as needing to be updated. It should be
* called once for each mapping.
*/
void
xfs_trans_log_start_rmap_update(
struct xfs_trans *tp,
struct xfs_rui_log_item *ruip,
enum xfs_rmap_intent_type type,
__uint64_t owner,
int whichfork,
xfs_fileoff_t startoff,
xfs_fsblock_t startblock,
xfs_filblks_t blockcount,
xfs_exntst_t state)
{
uint next_extent;
struct xfs_map_extent *rmap;
tp->t_flags |= XFS_TRANS_DIRTY;
ruip->rui_item.li_desc->lid_flags |= XFS_LID_DIRTY;
/*
* atomic_inc_return gives us the value after the increment;
* we want to use it as an array index so we need to subtract 1 from
* it.
*/
next_extent = atomic_inc_return(&ruip->rui_next_extent) - 1;
ASSERT(next_extent < ruip->rui_format.rui_nextents);
rmap = &(ruip->rui_format.rui_extents[next_extent]);
rmap->me_owner = owner;
rmap->me_startblock = startblock;
rmap->me_startoff = startoff;
rmap->me_len = blockcount;
xfs_trans_set_rmap_flags(rmap, type, whichfork, state);
}
/*
* This routine is called to allocate an "rmap update done"
* log item that will hold nextents worth of extents. The
* caller must use all nextents extents, because we are not
* flexible about this at all.
*/
struct xfs_rud_log_item *
xfs_trans_get_rud(
struct xfs_trans *tp,
struct xfs_rui_log_item *ruip,
uint nextents)
{
struct xfs_rud_log_item *rudp;
ASSERT(tp != NULL);
ASSERT(nextents > 0);
rudp = xfs_rud_init(tp->t_mountp, ruip, nextents);
ASSERT(rudp != NULL);
/*
* Get a log_item_desc to point at the new item.
*/
xfs_trans_add_item(tp, &rudp->rud_item);
return rudp;
}
/*
* Finish an rmap update and log it to the RUD. Note that the transaction is
* marked dirty regardless of whether the rmap update succeeds or fails to
* support the RUI/RUD lifecycle rules.
*/
int
xfs_trans_log_finish_rmap_update(
struct xfs_trans *tp,
struct xfs_rud_log_item *rudp,
enum xfs_rmap_intent_type type,
__uint64_t owner,
int whichfork,
xfs_fileoff_t startoff,
xfs_fsblock_t startblock,
xfs_filblks_t blockcount,
xfs_exntst_t state)
{
uint next_extent;
struct xfs_map_extent *rmap;
int error;
/* XXX: actually finish the rmap update here */
error = -EFSCORRUPTED;
/*
* Mark the transaction dirty, even on error. This ensures the
* transaction is aborted, which:
*
* 1.) releases the RUI and frees the RUD
* 2.) shuts down the filesystem
*/
tp->t_flags |= XFS_TRANS_DIRTY;
rudp->rud_item.li_desc->lid_flags |= XFS_LID_DIRTY;
next_extent = rudp->rud_next_extent;
ASSERT(next_extent < rudp->rud_format.rud_nextents);
rmap = &(rudp->rud_format.rud_extents[next_extent]);
rmap->me_owner = owner;
rmap->me_startblock = startblock;
rmap->me_startoff = startoff;
rmap->me_len = blockcount;
xfs_trans_set_rmap_flags(rmap, type, whichfork, state);
rudp->rud_next_extent++;
return error;
}
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