fs/xfs/xfs_extfree_item.h

   1 /*
   2  * Copyright (c) 2000 Silicon Graphics, Inc.  All Rights Reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of version 2 of the GNU General Public License as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it would be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  11  *
  12  * Further, this software is distributed without any warranty that it is
  13  * free of the rightful claim of any third person regarding infringement
  14  * or the like.  Any license provided herein, whether implied or
  15  * otherwise, applies only to this software file.  Patent licenses, if
  16  * any, provided herein do not apply to combinations of this program with
  17  * other software, or any other product whatsoever.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, write the Free Software Foundation, Inc., 59
  21  * Temple Place - Suite 330, Boston MA 02111-1307, USA.
  22  *
  23  * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
  24  * Mountain View, CA  94043, or:
  25  *
  26  * http://www.sgi.com
  27  *
  28  * For further information regarding this notice, see:
  29  *
  30  * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
  31  */
  32 #ifndef __XFS_EXTFREE_ITEM_H__
  33 #define __XFS_EXTFREE_ITEM_H__
  34
  35 struct xfs_mount;
  36 struct kmem_zone;
  37
  38 typedef struct xfs_extent {
  39         xfs_dfsbno_t    ext_start;
  40         xfs_extlen_t    ext_len;
  41 } xfs_extent_t;
  42
  43 /*
  44  * This is the structure used to lay out an efi log item in the
  45  * log.  The efi_extents field is a variable size array whose
  46  * size is given by efi_nextents.
  47  */
  48 typedef struct xfs_efi_log_format {
  49         unsigned short          efi_type;       /* efi log item type */
  50         unsigned short          efi_size;       /* size of this item */
  51         uint                    efi_nextents;   /* # extents to free */
  52         __uint64_t              efi_id;         /* efi identifier */
  53         xfs_extent_t            efi_extents[1]; /* array of extents to free */
  54 } xfs_efi_log_format_t;
  55
  56 /*
  57  * This is the structure used to lay out an efd log item in the
  58  * log.  The efd_extents array is a variable size array whose
  59  * size is given by efd_nextents;
  60  */
  61 typedef struct xfs_efd_log_format {
  62         unsigned short          efd_type;       /* efd log item type */
  63         unsigned short          efd_size;       /* size of this item */
  64         uint                    efd_nextents;   /* # of extents freed */
  65         __uint64_t              efd_efi_id;     /* id of corresponding efi */
  66         xfs_extent_t            efd_extents[1]; /* array of extents freed */
  67 } xfs_efd_log_format_t;
  68
  69
  70 #ifdef __KERNEL__
  71
  72 /*
  73  * Max number of extents in fast allocation path.
  74  */
  75 #define XFS_EFI_MAX_FAST_EXTENTS        16
  76
  77 /*
  78  * Define EFI flags.
  79  */
  80 #define XFS_EFI_RECOVERED       0x1
  81 #define XFS_EFI_COMMITTED       0x2
  82 #define XFS_EFI_CANCELED        0x4
  83
  84 /*
  85  * This is the "extent free intention" log item.  It is used
  86  * to log the fact that some extents need to be free.  It is
  87  * used in conjunction with the "extent free done" log item
  88  * described below.
  89  */
  90 typedef struct xfs_efi_log_item {
  91         xfs_log_item_t          efi_item;
  92         uint                    efi_flags;      /* misc flags */
  93         uint                    efi_next_extent;
  94         xfs_efi_log_format_t    efi_format;
  95 } xfs_efi_log_item_t;
  96
  97 /*
  98  * This is the "extent free done" log item.  It is used to log
  99  * the fact that some extents earlier mentioned in an efi item
 100  * have been freed.
 101  */
 102 typedef struct xfs_efd_log_item {
 103         xfs_log_item_t          efd_item;
 104         xfs_efi_log_item_t      *efd_efip;
 105         uint                    efd_next_extent;
 106         xfs_efd_log_format_t    efd_format;
 107 } xfs_efd_log_item_t;
 108
 109 /*
 110  * Max number of extents in fast allocation path.
 111  */
 112 #define XFS_EFD_MAX_FAST_EXTENTS        16
 113
 114 extern struct kmem_zone *xfs_efi_zone;
 115 extern struct kmem_zone *xfs_efd_zone;
 116
 117 xfs_efi_log_item_t      *xfs_efi_init(struct xfs_mount *, uint);
 118 xfs_efd_log_item_t      *xfs_efd_init(struct xfs_mount *, xfs_efi_log_item_t *,
 119                                       uint);
 120
 121 void                    xfs_efi_item_free(xfs_efi_log_item_t *);
 122
 123 #endif  /* __KERNEL__ */
 124
 125 #endif  /* __XFS_EXTFREE_ITEM_H__ */