fs/xfs/xfs_extfree_item.h

   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 #ifndef __XFS_EXTFREE_ITEM_H__
  19 #define __XFS_EXTFREE_ITEM_H__
  20
  21 struct xfs_mount;
  22 struct kmem_zone;
  23
  24 typedef struct xfs_extent {
  25         xfs_dfsbno_t    ext_start;
  26         xfs_extlen_t    ext_len;
  27 } xfs_extent_t;
  28
  29 /*
  30  * This is the structure used to lay out an efi log item in the
  31  * log.  The efi_extents field is a variable size array whose
  32  * size is given by efi_nextents.
  33  */
  34 typedef struct xfs_efi_log_format {
  35         unsigned short          efi_type;       /* efi log item type */
  36         unsigned short          efi_size;       /* size of this item */
  37         uint                    efi_nextents;   /* # extents to free */
  38         __uint64_t              efi_id;         /* efi identifier */
  39         xfs_extent_t            efi_extents[1]; /* array of extents to free */
  40 } xfs_efi_log_format_t;
  41
  42 /*
  43  * This is the structure used to lay out an efd log item in the
  44  * log.  The efd_extents array is a variable size array whose
  45  * size is given by efd_nextents;
  46  */
  47 typedef struct xfs_efd_log_format {
  48         unsigned short          efd_type;       /* efd log item type */
  49         unsigned short          efd_size;       /* size of this item */
  50         uint                    efd_nextents;   /* # of extents freed */
  51         __uint64_t              efd_efi_id;     /* id of corresponding efi */
  52         xfs_extent_t            efd_extents[1]; /* array of extents freed */
  53 } xfs_efd_log_format_t;
  54
  55
  56 #ifdef __KERNEL__
  57
  58 /*
  59  * Max number of extents in fast allocation path.
  60  */
  61 #define XFS_EFI_MAX_FAST_EXTENTS        16
  62
  63 /*
  64  * Define EFI flags.
  65  */
  66 #define XFS_EFI_RECOVERED       0x1
  67 #define XFS_EFI_COMMITTED       0x2
  68 #define XFS_EFI_CANCELED        0x4
  69
  70 /*
  71  * This is the "extent free intention" log item.  It is used
  72  * to log the fact that some extents need to be free.  It is
  73  * used in conjunction with the "extent free done" log item
  74  * described below.
  75  */
  76 typedef struct xfs_efi_log_item {
  77         xfs_log_item_t          efi_item;
  78         uint                    efi_flags;      /* misc flags */
  79         uint                    efi_next_extent;
  80         xfs_efi_log_format_t    efi_format;
  81 } xfs_efi_log_item_t;
  82
  83 /*
  84  * This is the "extent free done" log item.  It is used to log
  85  * the fact that some extents earlier mentioned in an efi item
  86  * have been freed.
  87  */
  88 typedef struct xfs_efd_log_item {
  89         xfs_log_item_t          efd_item;
  90         xfs_efi_log_item_t      *efd_efip;
  91         uint                    efd_next_extent;
  92         xfs_efd_log_format_t    efd_format;
  93 } xfs_efd_log_item_t;
  94
  95 /*
  96  * Max number of extents in fast allocation path.
  97  */
  98 #define XFS_EFD_MAX_FAST_EXTENTS        16
  99
 100 extern struct kmem_zone *xfs_efi_zone;
 101 extern struct kmem_zone *xfs_efd_zone;
 102
 103 xfs_efi_log_item_t      *xfs_efi_init(struct xfs_mount *, uint);
 104 xfs_efd_log_item_t      *xfs_efd_init(struct xfs_mount *, xfs_efi_log_item_t *,
 105                                       uint);
 106
 107 void                    xfs_efi_item_free(xfs_efi_log_item_t *);
 108
 109 #endif  /* __KERNEL__ */
 110
 111 #endif  /* __XFS_EXTFREE_ITEM_H__ */