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 typedef struct xfs_extent_32 {
  37         __uint64_t      ext_start;
  38         __uint32_t      ext_len;
  39 } __attribute__((packed)) xfs_extent_32_t;
  40
  41 typedef 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  */
  52 typedef 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
  60 typedef 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
  68 typedef 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  */
  81 typedef 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
  89 typedef 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
  97 typedef 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  */
 125 typedef 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  */
 137 typedef 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
 149 extern struct kmem_zone *xfs_efi_zone;
 150 extern struct kmem_zone *xfs_efd_zone;
 151
 152 xfs_efi_log_item_t      *xfs_efi_init(struct xfs_mount *, uint);
 153 xfs_efd_log_item_t      *xfs_efd_init(struct xfs_mount *, xfs_efi_log_item_t *,
 154                                       uint);
 155 int                     xfs_efi_copy_format(xfs_log_iovec_t *buf,
 156                                             xfs_efi_log_format_t *dst_efi_fmt);
 157 void                    xfs_efi_item_free(xfs_efi_log_item_t *);
 158
 159 #endif  /* __KERNEL__ */
 160
 161 #endif  /* __XFS_EXTFREE_ITEM_H__ */