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_trans.h"
  23 #include "xfs_sb.h"
  24 #include "xfs_ag.h"
  25 #include "xfs_mount.h"
  26 #include "xfs_trans_priv.h"
  27 #include "xfs_extfree_item.h"
  28
  29 /*
  30  * This routine is called to allocate an "extent free intention"
  31  * log item that will hold nextents worth of extents.  The
  32  * caller must use all nextents extents, because we are not
  33  * flexible about this at all.
  34  */
  35 xfs_efi_log_item_t *
  36 xfs_trans_get_efi(xfs_trans_t   *tp,
  37                   uint          nextents)
  38 {
  39         xfs_efi_log_item_t      *efip;
  40
  41         ASSERT(tp != NULL);
  42         ASSERT(nextents > 0);
  43
  44         efip = xfs_efi_init(tp->t_mountp, nextents);
  45         ASSERT(efip != NULL);
  46
  47         /*
  48          * Get a log_item_desc to point at the new item.
  49          */
  50         xfs_trans_add_item(tp, &efip->efi_item);
  51         return efip;
  52 }
  53
  54 /*
  55  * This routine is called to indicate that the described
  56  * extent is to be logged as needing to be freed.  It should
  57  * be called once for each extent to be freed.
  58  */
  59 void
  60 xfs_trans_log_efi_extent(xfs_trans_t            *tp,
  61                          xfs_efi_log_item_t     *efip,
  62                          xfs_fsblock_t          start_block,
  63                          xfs_extlen_t           ext_len)
  64 {
  65         uint                    next_extent;
  66         xfs_extent_t            *extp;
  67
  68         tp->t_flags |= XFS_TRANS_DIRTY;
  69         efip->efi_item.li_desc->lid_flags |= XFS_LID_DIRTY;
  70
  71         /*
  72          * atomic_inc_return gives us the value after the increment;
  73          * we want to use it as an array index so we need to subtract 1 from
  74          * it.
  75          */
  76         next_extent = atomic_inc_return(&efip->efi_next_extent) - 1;
  77         ASSERT(next_extent < efip->efi_format.efi_nextents);
  78         extp = &(efip->efi_format.efi_extents[next_extent]);
  79         extp->ext_start = start_block;
  80         extp->ext_len = ext_len;
  81 }
  82
  83
  84 /*
  85  * This routine is called to allocate an "extent free done"
  86  * log item that will hold nextents worth of extents.  The
  87  * caller must use all nextents extents, because we are not
  88  * flexible about this at all.
  89  */
  90 xfs_efd_log_item_t *
  91 xfs_trans_get_efd(xfs_trans_t           *tp,
  92                   xfs_efi_log_item_t    *efip,
  93                   uint                  nextents)
  94 {
  95         xfs_efd_log_item_t      *efdp;
  96
  97         ASSERT(tp != NULL);
  98         ASSERT(nextents > 0);
  99
 100         efdp = xfs_efd_init(tp->t_mountp, efip, nextents);
 101         ASSERT(efdp != NULL);
 102
 103         /*
 104          * Get a log_item_desc to point at the new item.
 105          */
 106         xfs_trans_add_item(tp, &efdp->efd_item);
 107         return efdp;
 108 }
 109
 110 /*
 111  * This routine is called to indicate that the described
 112  * extent is to be logged as having been freed.  It should
 113  * be called once for each extent freed.
 114  */
 115 void
 116 xfs_trans_log_efd_extent(xfs_trans_t            *tp,
 117                          xfs_efd_log_item_t     *efdp,
 118                          xfs_fsblock_t          start_block,
 119                          xfs_extlen_t           ext_len)
 120 {
 121         uint                    next_extent;
 122         xfs_extent_t            *extp;
 123
 124         tp->t_flags |= XFS_TRANS_DIRTY;
 125         efdp->efd_item.li_desc->lid_flags |= XFS_LID_DIRTY;
 126
 127         next_extent = efdp->efd_next_extent;
 128         ASSERT(next_extent < efdp->efd_format.efd_nextents);
 129         extp = &(efdp->efd_format.efd_extents[next_extent]);
 130         extp->ext_start = start_block;
 131         extp->ext_len = ext_len;
 132         efdp->efd_next_extent++;
 133 }