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__ */ 162