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 /* kernel only EFI/EFD definitions */ 22 23 struct xfs_mount; 24 struct kmem_zone; 25 26 /* 27 * Max number of extents in fast allocation path. 28 */ 29 #define XFS_EFI_MAX_FAST_EXTENTS 16 30 31 /* 32 * Define EFI flag bits. Manipulated by set/clear/test_bit operators. 33 */ 34 #define XFS_EFI_RECOVERED 1 35 36 /* 37 * This is the "extent free intention" log item. It is used to log the fact 38 * that some extents need to be free. It is used in conjunction with the 39 * "extent free done" log item described below. 40 * 41 * The EFI is reference counted so that it is not freed prior to both the EFI 42 * and EFD being committed and unpinned. This ensures that when the last 43 * reference goes away the EFI will always be in the AIL as it has been 44 * unpinned, regardless of whether the EFD is processed before or after the EFI. 45 */ 46 typedef struct xfs_efi_log_item { 47 xfs_log_item_t efi_item; 48 atomic_t efi_refcount; 49 atomic_t efi_next_extent; 50 unsigned long efi_flags; /* misc flags */ 51 xfs_efi_log_format_t efi_format; 52 } xfs_efi_log_item_t; 53 54 /* 55 * This is the "extent free done" log item. It is used to log 56 * the fact that some extents earlier mentioned in an efi item 57 * have been freed. 58 */ 59 typedef struct xfs_efd_log_item { 60 xfs_log_item_t efd_item; 61 xfs_efi_log_item_t *efd_efip; 62 uint efd_next_extent; 63 xfs_efd_log_format_t efd_format; 64 } xfs_efd_log_item_t; 65 66 /* 67 * Max number of extents in fast allocation path. 68 */ 69 #define XFS_EFD_MAX_FAST_EXTENTS 16 70 71 extern struct kmem_zone *xfs_efi_zone; 72 extern struct kmem_zone *xfs_efd_zone; 73 74 xfs_efi_log_item_t *xfs_efi_init(struct xfs_mount *, uint); 75 xfs_efd_log_item_t *xfs_efd_init(struct xfs_mount *, xfs_efi_log_item_t *, 76 uint); 77 int xfs_efi_copy_format(xfs_log_iovec_t *buf, 78 xfs_efi_log_format_t *dst_efi_fmt); 79 void xfs_efi_item_free(xfs_efi_log_item_t *); 80 81 #endif /* __XFS_EXTFREE_ITEM_H__ */ 82