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  * Since an xfs_extent_t has types (start:64, len: 32)
  31  * there are different alignments on 32 bit and 64 bit kernels.
  32  * So we provide the different variants for use by a
  33  * conversion routine.
  34  */
  35
  36 #ifndef HAVE_FORMAT32
  37 typedef struct xfs_extent_32 {
  38         __uint64_t      ext_start;
  39         __uint32_t      ext_len;
  40 } __attribute__((packed)) xfs_extent_32_t;
  41 #endif
  42
  43 typedef struct xfs_extent_64 {
  44         __uint64_t      ext_start;
  45         __uint32_t      ext_len;
  46         __uint32_t      ext_pad;
  47 } xfs_extent_64_t;
  48
  49 /*
  50  * This is the structure used to lay out an efi log item in the
  51  * log.  The efi_extents field is a variable size array whose
  52  * size is given by efi_nextents.
  53  */
  54 typedef struct xfs_efi_log_format {
  55         __uint16_t              efi_type;       /* efi log item type */
  56         __uint16_t              efi_size;       /* size of this item */
  57         __uint32_t              efi_nextents;   /* # extents to free */
  58         __uint64_t              efi_id;         /* efi identifier */
  59         xfs_extent_t            efi_extents[1]; /* array of extents to free */
  60 } xfs_efi_log_format_t;
  61
  62 #ifndef HAVE_FORMAT32
  63 typedef struct xfs_efi_log_format_32 {
  64         __uint16_t              efi_type;       /* efi log item type */
  65         __uint16_t              efi_size;       /* size of this item */
  66         __uint32_t              efi_nextents;   /* # extents to free */
  67         __uint64_t              efi_id;         /* efi identifier */
  68         xfs_extent_32_t         efi_extents[1]; /* array of extents to free */
  69 } __attribute__((packed)) xfs_efi_log_format_32_t;
  70 #endif
  71
  72 typedef struct xfs_efi_log_format_64 {
  73         __uint16_t              efi_type;       /* efi log item type */
  74         __uint16_t              efi_size;       /* size of this item */
  75         __uint32_t              efi_nextents;   /* # extents to free */
  76         __uint64_t              efi_id;         /* efi identifier */
  77         xfs_extent_64_t         efi_extents[1]; /* array of extents to free */
  78 } xfs_efi_log_format_64_t;
  79
  80 /*
  81  * This is the structure used to lay out an efd log item in the
  82  * log.  The efd_extents array is a variable size array whose
  83  * size is given by efd_nextents;
  84  */
  85 typedef struct xfs_efd_log_format {
  86         __uint16_t              efd_type;       /* efd log item type */
  87         __uint16_t              efd_size;       /* size of this item */
  88         __uint32_t              efd_nextents;   /* # of extents freed */
  89         __uint64_t              efd_efi_id;     /* id of corresponding efi */
  90         xfs_extent_t            efd_extents[1]; /* array of extents freed */
  91 } xfs_efd_log_format_t;
  92
  93 #ifndef HAVE_FORMAT32
  94 typedef struct xfs_efd_log_format_32 {
  95         __uint16_t              efd_type;       /* efd log item type */
  96         __uint16_t              efd_size;       /* size of this item */
  97         __uint32_t              efd_nextents;   /* # of extents freed */
  98         __uint64_t              efd_efi_id;     /* id of corresponding efi */
  99         xfs_extent_32_t         efd_extents[1]; /* array of extents freed */
 100 } __attribute__((packed)) xfs_efd_log_format_32_t;
 101 #endif
 102
 103 typedef struct xfs_efd_log_format_64 {
 104         __uint16_t              efd_type;       /* efd log item type */
 105         __uint16_t              efd_size;       /* size of this item */
 106         __uint32_t              efd_nextents;   /* # of extents freed */
 107         __uint64_t              efd_efi_id;     /* id of corresponding efi */
 108         xfs_extent_64_t         efd_extents[1]; /* array of extents freed */
 109 } xfs_efd_log_format_64_t;
 110
 111
 112 #ifdef __KERNEL__
 113
 114 /*
 115  * Max number of extents in fast allocation path.
 116  */
 117 #define XFS_EFI_MAX_FAST_EXTENTS        16
 118
 119 /*
 120  * Define EFI flags.
 121  */
 122 #define XFS_EFI_RECOVERED       0x1
 123 #define XFS_EFI_COMMITTED       0x2
 124 #define XFS_EFI_CANCELED        0x4
 125
 126 /*
 127  * This is the "extent free intention" log item.  It is used
 128  * to log the fact that some extents need to be free.  It is
 129  * used in conjunction with the "extent free done" log item
 130  * described below.
 131  */
 132 typedef struct xfs_efi_log_item {
 133         xfs_log_item_t          efi_item;
 134         uint                    efi_flags;      /* misc flags */
 135         uint                    efi_next_extent;
 136         xfs_efi_log_format_t    efi_format;
 137 } xfs_efi_log_item_t;
 138
 139 /*
 140  * This is the "extent free done" log item.  It is used to log
 141  * the fact that some extents earlier mentioned in an efi item
 142  * have been freed.
 143  */
 144 typedef struct xfs_efd_log_item {
 145         xfs_log_item_t          efd_item;
 146         xfs_efi_log_item_t      *efd_efip;
 147         uint                    efd_next_extent;
 148         xfs_efd_log_format_t    efd_format;
 149 } xfs_efd_log_item_t;
 150
 151 /*
 152  * Max number of extents in fast allocation path.
 153  */
 154 #define XFS_EFD_MAX_FAST_EXTENTS        16
 155
 156 extern struct kmem_zone *xfs_efi_zone;
 157 extern struct kmem_zone *xfs_efd_zone;
 158
 159 xfs_efi_log_item_t      *xfs_efi_init(struct xfs_mount *, uint);
 160 xfs_efd_log_item_t      *xfs_efd_init(struct xfs_mount *, xfs_efi_log_item_t *,
 161                                       uint);
 162 int                     xfs_efi_copy_format(xfs_log_iovec_t *buf,
 163                                             xfs_efi_log_format_t *dst_efi_fmt);
 164 void                    xfs_efi_item_free(xfs_efi_log_item_t *);
 165
 166 #endif  /* __KERNEL__ */
 167
 168 #endif  /* __XFS_EXTFREE_ITEM_H__ */