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 * This is the structure used to lay out an efi log item in the 31 * log. The efi_extents field is a variable size array whose 32 * size is given by efi_nextents. 33 */ 34 typedef struct xfs_efi_log_format { 35 unsigned short efi_type; /* efi log item type */ 36 unsigned short efi_size; /* size of this item */ 37 uint efi_nextents; /* # extents to free */ 38 __uint64_t efi_id; /* efi identifier */ 39 xfs_extent_t efi_extents[1]; /* array of extents to free */ 40 } xfs_efi_log_format_t; 41 42 /* 43 * This is the structure used to lay out an efd log item in the 44 * log. The efd_extents array is a variable size array whose 45 * size is given by efd_nextents; 46 */ 47 typedef struct xfs_efd_log_format { 48 unsigned short efd_type; /* efd log item type */ 49 unsigned short efd_size; /* size of this item */ 50 uint efd_nextents; /* # of extents freed */ 51 __uint64_t efd_efi_id; /* id of corresponding efi */ 52 xfs_extent_t efd_extents[1]; /* array of extents freed */ 53 } xfs_efd_log_format_t; 54 55 56 #ifdef __KERNEL__ 57 58 /* 59 * Max number of extents in fast allocation path. 60 */ 61 #define XFS_EFI_MAX_FAST_EXTENTS 16 62 63 /* 64 * Define EFI flags. 65 */ 66 #define XFS_EFI_RECOVERED 0x1 67 #define XFS_EFI_COMMITTED 0x2 68 #define XFS_EFI_CANCELED 0x4 69 70 /* 71 * This is the "extent free intention" log item. It is used 72 * to log the fact that some extents need to be free. It is 73 * used in conjunction with the "extent free done" log item 74 * described below. 75 */ 76 typedef struct xfs_efi_log_item { 77 xfs_log_item_t efi_item; 78 uint efi_flags; /* misc flags */ 79 uint efi_next_extent; 80 xfs_efi_log_format_t efi_format; 81 } xfs_efi_log_item_t; 82 83 /* 84 * This is the "extent free done" log item. It is used to log 85 * the fact that some extents earlier mentioned in an efi item 86 * have been freed. 87 */ 88 typedef struct xfs_efd_log_item { 89 xfs_log_item_t efd_item; 90 xfs_efi_log_item_t *efd_efip; 91 uint efd_next_extent; 92 xfs_efd_log_format_t efd_format; 93 } xfs_efd_log_item_t; 94 95 /* 96 * Max number of extents in fast allocation path. 97 */ 98 #define XFS_EFD_MAX_FAST_EXTENTS 16 99 100 extern struct kmem_zone *xfs_efi_zone; 101 extern struct kmem_zone *xfs_efd_zone; 102 103 xfs_efi_log_item_t *xfs_efi_init(struct xfs_mount *, uint); 104 xfs_efd_log_item_t *xfs_efd_init(struct xfs_mount *, xfs_efi_log_item_t *, 105 uint); 106 107 void xfs_efi_item_free(xfs_efi_log_item_t *); 108 109 #endif /* __KERNEL__ */ 110 111 #endif /* __XFS_EXTFREE_ITEM_H__ */ 112