fs/xfs/xfs_trans_extfree.c

   1 /*
   2  * Copyright (c) 2000,2005 Silicon Graphics, Inc.
   3  * All Rights Reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it would be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write the Free Software Foundation,
  16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18 #include "xfs.h"
  19 #include "xfs_fs.h"
  20 #include "xfs_types.h"
  21 #include "xfs_log.h"
  22 #include "xfs_inum.h"
  23 #include "xfs_trans.h"
  24 #include "xfs_sb.h"
  25 #include "xfs_ag.h"
  26 #include "xfs_dmapi.h"
  27 #include "xfs_mount.h"
  28 #include "xfs_trans_priv.h"
  29 #include "xfs_extfree_item.h"
  30
  31 /*
  32  * This routine is called to allocate an "extent free intention"
  33  * log item that will hold nextents worth of extents.  The
  34  * caller must use all nextents extents, because we are not
  35  * flexible about this at all.
  36  */
  37 xfs_efi_log_item_t *
  38 xfs_trans_get_efi(xfs_trans_t   *tp,
  39                   uint          nextents)
  40 {
  41         xfs_efi_log_item_t      *efip;
  42
  43         ASSERT(tp != NULL);
  44         ASSERT(nextents > 0);
  45
  46         efip = xfs_efi_init(tp->t_mountp, nextents);
  47         ASSERT(efip != NULL);
  48
  49         /*
  50          * Get a log_item_desc to point at the new item.
  51          */
  52         (void) xfs_trans_add_item(tp, (xfs_log_item_t*)efip);
  53
  54         return (efip);
  55 }
  56
  57 /*
  58  * This routine is called to indicate that the described
  59  * extent is to be logged as needing to be freed.  It should
  60  * be called once for each extent to be freed.
  61  */
  62 void
  63 xfs_trans_log_efi_extent(xfs_trans_t            *tp,
  64                          xfs_efi_log_item_t     *efip,
  65                          xfs_fsblock_t          start_block,
  66                          xfs_extlen_t           ext_len)
  67 {
  68         xfs_log_item_desc_t     *lidp;
  69         uint                    next_extent;
  70         xfs_extent_t            *extp;
  71
  72         lidp = xfs_trans_find_item(tp, (xfs_log_item_t*)efip);
  73         ASSERT(lidp != NULL);
  74
  75         tp->t_flags |= XFS_TRANS_DIRTY;
  76         lidp->lid_flags |= XFS_LID_DIRTY;
  77
  78         next_extent = efip->efi_next_extent;
  79         ASSERT(next_extent < efip->efi_format.efi_nextents);
  80         extp = &(efip->efi_format.efi_extents[next_extent]);
  81         extp->ext_start = start_block;
  82         extp->ext_len = ext_len;
  83         efip->efi_next_extent++;
  84 }
  85
  86
  87 /*
  88  * This routine is called to allocate an "extent free done"
  89  * log item that will hold nextents worth of extents.  The
  90  * caller must use all nextents extents, because we are not
  91  * flexible about this at all.
  92  */
  93 xfs_efd_log_item_t *
  94 xfs_trans_get_efd(xfs_trans_t           *tp,
  95                   xfs_efi_log_item_t    *efip,
  96                   uint                  nextents)
  97 {
  98         xfs_efd_log_item_t      *efdp;
  99
 100         ASSERT(tp != NULL);
 101         ASSERT(nextents > 0);
 102
 103         efdp = xfs_efd_init(tp->t_mountp, efip, nextents);
 104         ASSERT(efdp != NULL);
 105
 106         /*
 107          * Get a log_item_desc to point at the new item.
 108          */
 109         (void) xfs_trans_add_item(tp, (xfs_log_item_t*)efdp);
 110
 111         return (efdp);
 112 }
 113
 114 /*
 115  * This routine is called to indicate that the described
 116  * extent is to be logged as having been freed.  It should
 117  * be called once for each extent freed.
 118  */
 119 void
 120 xfs_trans_log_efd_extent(xfs_trans_t            *tp,
 121                          xfs_efd_log_item_t     *efdp,
 122                          xfs_fsblock_t          start_block,
 123                          xfs_extlen_t           ext_len)
 124 {
 125         xfs_log_item_desc_t     *lidp;
 126         uint                    next_extent;
 127         xfs_extent_t            *extp;
 128
 129         lidp = xfs_trans_find_item(tp, (xfs_log_item_t*)efdp);
 130         ASSERT(lidp != NULL);
 131
 132         tp->t_flags |= XFS_TRANS_DIRTY;
 133         lidp->lid_flags |= XFS_LID_DIRTY;
 134
 135         next_extent = efdp->efd_next_extent;
 136         ASSERT(next_extent < efdp->efd_format.efd_nextents);
 137         extp = &(efdp->efd_format.efd_extents[next_extent]);
 138         extp->ext_start = start_block;
 139         extp->ext_len = ext_len;
 140         efdp->efd_next_extent++;
 141 }