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 36#ifndef HAVE_FORMAT32 37typedef struct xfs_extent_32 { 38 __uint64_t ext_start; 39 __uint32_t ext_len; 40} __attribute__((packed)) xfs_extent_32_t; 41#endif 42 43typedef 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 */ 54typedef 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 63typedef 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 72typedef 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 */ 85typedef 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 94typedef 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 103typedef 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 */ 132typedef 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 */ 144typedef 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 156extern struct kmem_zone *xfs_efi_zone; 157extern struct kmem_zone *xfs_efd_zone; 158 159xfs_efi_log_item_t *xfs_efi_init(struct xfs_mount *, uint); 160xfs_efd_log_item_t *xfs_efd_init(struct xfs_mount *, xfs_efi_log_item_t *, 161 uint); 162int xfs_efi_copy_format(xfs_log_iovec_t *buf, 163 xfs_efi_log_format_t *dst_efi_fmt); 164void xfs_efi_item_free(xfs_efi_log_item_t *); 165 166#endif /* __KERNEL__ */ 167 168#endif /* __XFS_EXTFREE_ITEM_H__ */ 169