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_dmapi.h"
  26 #include "xfs_mount.h"
  27 #include "xfs_trans_priv.h"
  28 #include "xfs_extfree_item.h"
  29
  30 /*
  31  * This routine is called to allocate an "extent free intention"
  32  * log item that will hold nextents worth of extents.  The
  33  * caller must use all nextents extents, because we are not
  34  * flexible about this at all.
  35  */
  36 xfs_efi_log_item_t *
  37 xfs_trans_get_efi(xfs_trans_t   *tp,
  38                   uint          nextents)
  39 {
  40         xfs_efi_log_item_t      *efip;
  41
  42         ASSERT(tp != NULL);
  43         ASSERT(nextents > 0);
  44
  45         efip = xfs_efi_init(tp->t_mountp, nextents);
  46         ASSERT(efip != NULL);
  47
  48         /*
  49          * Get a log_item_desc to point at the new item.
  50          */
  51         (void) xfs_trans_add_item(tp, (xfs_log_item_t*)efip);
  52
  53         return (efip);
  54 }
  55
  56 /*
  57  * This routine is called to indicate that the described
  58  * extent is to be logged as needing to be freed.  It should
  59  * be called once for each extent to be freed.
  60  */
  61 void
  62 xfs_trans_log_efi_extent(xfs_trans_t            *tp,
  63                          xfs_efi_log_item_t     *efip,
  64                          xfs_fsblock_t          start_block,
  65                          xfs_extlen_t           ext_len)
  66 {
  67         xfs_log_item_desc_t     *lidp;
  68         uint                    next_extent;
  69         xfs_extent_t            *extp;
  70
  71         lidp = xfs_trans_find_item(tp, (xfs_log_item_t*)efip);
  72         ASSERT(lidp != NULL);
  73
  74         tp->t_flags |= XFS_TRANS_DIRTY;
  75         lidp->lid_flags |= XFS_LID_DIRTY;
  76
  77         next_extent = efip->efi_next_extent;
  78         ASSERT(next_extent < efip->efi_format.efi_nextents);
  79         extp = &(efip->efi_format.efi_extents[next_extent]);
  80         extp->ext_start = start_block;
  81         extp->ext_len = ext_len;
  82         efip->efi_next_extent++;
  83 }
  84
  85
  86 /*
  87  * This routine is called to allocate an "extent free done"
  88  * log item that will hold nextents worth of extents.  The
  89  * caller must use all nextents extents, because we are not
  90  * flexible about this at all.
  91  */
  92 xfs_efd_log_item_t *
  93 xfs_trans_get_efd(xfs_trans_t           *tp,
  94                   xfs_efi_log_item_t    *efip,
  95                   uint                  nextents)
  96 {
  97         xfs_efd_log_item_t      *efdp;
  98
  99         ASSERT(tp != NULL);
 100         ASSERT(nextents > 0);
 101
 102         efdp = xfs_efd_init(tp->t_mountp, efip, nextents);
 103         ASSERT(efdp != NULL);
 104
 105         /*
 106          * Get a log_item_desc to point at the new item.
 107          */
 108         (void) xfs_trans_add_item(tp, (xfs_log_item_t*)efdp);
 109
 110         return (efdp);
 111 }
 112
 113 /*
 114  * This routine is called to indicate that the described
 115  * extent is to be logged as having been freed.  It should
 116  * be called once for each extent freed.
 117  */
 118 void
 119 xfs_trans_log_efd_extent(xfs_trans_t            *tp,
 120                          xfs_efd_log_item_t     *efdp,
 121                          xfs_fsblock_t          start_block,
 122                          xfs_extlen_t           ext_len)
 123 {
 124         xfs_log_item_desc_t     *lidp;
 125         uint                    next_extent;
 126         xfs_extent_t            *extp;
 127
 128         lidp = xfs_trans_find_item(tp, (xfs_log_item_t*)efdp);
 129         ASSERT(lidp != NULL);
 130
 131         tp->t_flags |= XFS_TRANS_DIRTY;
 132         lidp->lid_flags |= XFS_LID_DIRTY;
 133
 134         next_extent = efdp->efd_next_extent;
 135         ASSERT(next_extent < efdp->efd_format.efd_nextents);
 136         extp = &(efdp->efd_format.efd_extents[next_extent]);
 137         extp->ext_start = start_block;
 138         extp->ext_len = ext_len;
 139         efdp->efd_next_extent++;
 140 }