linux/fs/xfs/xfs_extfree_item.h
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   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
  21struct xfs_mount;
  22struct kmem_zone;
  23
  24typedef 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
  36typedef struct xfs_extent_32 {
  37        __uint64_t      ext_start;
  38        __uint32_t      ext_len;
  39} __attribute__((packed)) xfs_extent_32_t;
  40
  41typedef struct xfs_extent_64 {
  42        __uint64_t      ext_start;
  43        __uint32_t      ext_len;
  44        __uint32_t      ext_pad;
  45} xfs_extent_64_t;
  46
  47/*
  48 * This is the structure used to lay out an efi log item in the
  49 * log.  The efi_extents field is a variable size array whose
  50 * size is given by efi_nextents.
  51 */
  52typedef struct xfs_efi_log_format {
  53        __uint16_t              efi_type;       /* efi log item type */
  54        __uint16_t              efi_size;       /* size of this item */
  55        __uint32_t              efi_nextents;   /* # extents to free */
  56        __uint64_t              efi_id;         /* efi identifier */
  57        xfs_extent_t            efi_extents[1]; /* array of extents to free */
  58} xfs_efi_log_format_t;
  59
  60typedef struct xfs_efi_log_format_32 {
  61        __uint16_t              efi_type;       /* efi log item type */
  62        __uint16_t              efi_size;       /* size of this item */
  63        __uint32_t              efi_nextents;   /* # extents to free */
  64        __uint64_t              efi_id;         /* efi identifier */
  65        xfs_extent_32_t         efi_extents[1]; /* array of extents to free */
  66} __attribute__((packed)) xfs_efi_log_format_32_t;
  67
  68typedef struct xfs_efi_log_format_64 {
  69        __uint16_t              efi_type;       /* efi log item type */
  70        __uint16_t              efi_size;       /* size of this item */
  71        __uint32_t              efi_nextents;   /* # extents to free */
  72        __uint64_t              efi_id;         /* efi identifier */
  73        xfs_extent_64_t         efi_extents[1]; /* array of extents to free */
  74} xfs_efi_log_format_64_t;
  75
  76/*
  77 * This is the structure used to lay out an efd log item in the
  78 * log.  The efd_extents array is a variable size array whose
  79 * size is given by efd_nextents;
  80 */
  81typedef struct xfs_efd_log_format {
  82        __uint16_t              efd_type;       /* efd log item type */
  83        __uint16_t              efd_size;       /* size of this item */
  84        __uint32_t              efd_nextents;   /* # of extents freed */
  85        __uint64_t              efd_efi_id;     /* id of corresponding efi */
  86        xfs_extent_t            efd_extents[1]; /* array of extents freed */
  87} xfs_efd_log_format_t;
  88
  89typedef struct xfs_efd_log_format_32 {
  90        __uint16_t              efd_type;       /* efd log item type */
  91        __uint16_t              efd_size;       /* size of this item */
  92        __uint32_t              efd_nextents;   /* # of extents freed */
  93        __uint64_t              efd_efi_id;     /* id of corresponding efi */
  94        xfs_extent_32_t         efd_extents[1]; /* array of extents freed */
  95} __attribute__((packed)) xfs_efd_log_format_32_t;
  96
  97typedef struct xfs_efd_log_format_64 {
  98        __uint16_t              efd_type;       /* efd log item type */
  99        __uint16_t              efd_size;       /* size of this item */
 100        __uint32_t              efd_nextents;   /* # of extents freed */
 101        __uint64_t              efd_efi_id;     /* id of corresponding efi */
 102        xfs_extent_64_t         efd_extents[1]; /* array of extents freed */
 103} xfs_efd_log_format_64_t;
 104
 105
 106#ifdef __KERNEL__
 107
 108/*
 109 * Max number of extents in fast allocation path.
 110 */
 111#define XFS_EFI_MAX_FAST_EXTENTS        16
 112
 113/*
 114 * Define EFI flag bits. Manipulated by set/clear/test_bit operators.
 115 */
 116#define XFS_EFI_RECOVERED       1
 117#define XFS_EFI_COMMITTED       2
 118
 119/*
 120 * This is the "extent free intention" log item.  It is used
 121 * to log the fact that some extents need to be free.  It is
 122 * used in conjunction with the "extent free done" log item
 123 * described below.
 124 */
 125typedef struct xfs_efi_log_item {
 126        xfs_log_item_t          efi_item;
 127        atomic_t                efi_next_extent;
 128        unsigned long           efi_flags;      /* misc flags */
 129        xfs_efi_log_format_t    efi_format;
 130} xfs_efi_log_item_t;
 131
 132/*
 133 * This is the "extent free done" log item.  It is used to log
 134 * the fact that some extents earlier mentioned in an efi item
 135 * have been freed.
 136 */
 137typedef struct xfs_efd_log_item {
 138        xfs_log_item_t          efd_item;
 139        xfs_efi_log_item_t      *efd_efip;
 140        uint                    efd_next_extent;
 141        xfs_efd_log_format_t    efd_format;
 142} xfs_efd_log_item_t;
 143
 144/*
 145 * Max number of extents in fast allocation path.
 146 */
 147#define XFS_EFD_MAX_FAST_EXTENTS        16
 148
 149extern struct kmem_zone *xfs_efi_zone;
 150extern struct kmem_zone *xfs_efd_zone;
 151
 152xfs_efi_log_item_t      *xfs_efi_init(struct xfs_mount *, uint);
 153xfs_efd_log_item_t      *xfs_efd_init(struct xfs_mount *, xfs_efi_log_item_t *,
 154                                      uint);
 155int                     xfs_efi_copy_format(xfs_log_iovec_t *buf,
 156                                            xfs_efi_log_format_t *dst_efi_fmt);
 157void                    xfs_efi_item_free(xfs_efi_log_item_t *);
 158
 159#endif  /* __KERNEL__ */
 160
 161#endif  /* __XFS_EXTFREE_ITEM_H__ */
 162
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