xfs_trans_extfree.c

Go to the documentation of this file.

/*
 * Copyright (c) 2000,2005 Silicon Graphics, Inc.
 * 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.
 *
 * 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_types.h"
#include "xfs_log.h"
#include "xfs_trans.h"
#include "xfs_sb.h"
#include "xfs_ag.h"
#include "xfs_mount.h"
#include "xfs_trans_priv.h"
#include "xfs_extfree_item.h"

/*
 * This routine is called to allocate an "extent free intention"
 * 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.
 */
xfs_efi_log_item_t *
xfs_trans_get_efi(xfs_trans_t   *tp,
          uint      nextents)
{
    xfs_efi_log_item_t  *efip;

    ASSERT(tp != NULL);
    ASSERT(nextents > 0);

    efip = xfs_efi_init(tp->t_mountp, nextents);
    ASSERT(efip != NULL);

    /*
     * Get a log_item_desc to point at the new item.
     */
    xfs_trans_add_item(tp, &efip->efi_item);
    return efip;
}

/*
 * This routine is called to indicate that the described
 * extent is to be logged as needing to be freed.  It should
 * be called once for each extent to be freed.
 */
void
xfs_trans_log_efi_extent(xfs_trans_t        *tp,
             xfs_efi_log_item_t *efip,
             xfs_fsblock_t      start_block,
             xfs_extlen_t       ext_len)
{
    uint            next_extent;
    xfs_extent_t        *extp;

    tp->t_flags |= XFS_TRANS_DIRTY;
    efip->efi_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(&efip->efi_next_extent) - 1;
    ASSERT(next_extent < efip->efi_format.efi_nextents);
    extp = &(efip->efi_format.efi_extents[next_extent]);
    extp->ext_start = start_block;
    extp->ext_len = ext_len;
}


/*
 * This routine is called to allocate an "extent free 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.
 */
xfs_efd_log_item_t *
xfs_trans_get_efd(xfs_trans_t       *tp,
          xfs_efi_log_item_t    *efip,
          uint          nextents)
{
    xfs_efd_log_item_t  *efdp;

    ASSERT(tp != NULL);
    ASSERT(nextents > 0);

    efdp = xfs_efd_init(tp->t_mountp, efip, nextents);
    ASSERT(efdp != NULL);

    /*
     * Get a log_item_desc to point at the new item.
     */
    xfs_trans_add_item(tp, &efdp->efd_item);
    return efdp;
}

/*
 * This routine is called to indicate that the described
 * extent is to be logged as having been freed.  It should
 * be called once for each extent freed.
 */
void
xfs_trans_log_efd_extent(xfs_trans_t        *tp,
             xfs_efd_log_item_t *efdp,
             xfs_fsblock_t      start_block,
             xfs_extlen_t       ext_len)
{
    uint            next_extent;
    xfs_extent_t        *extp;

    tp->t_flags |= XFS_TRANS_DIRTY;
    efdp->efd_item.li_desc->lid_flags |= XFS_LID_DIRTY;

    next_extent = efdp->efd_next_extent;
    ASSERT(next_extent < efdp->efd_format.efd_nextents);
    extp = &(efdp->efd_format.efd_extents[next_extent]);
    extp->ext_start = start_block;
    extp->ext_len = ext_len;
    efdp->efd_next_extent++;
}