331b6cc0ea
Improve support for writing to XFS partitions. Work done by: Russell Cattelan <cattelan at xfs dot org>
112 lines
3.2 KiB
C
112 lines
3.2 KiB
C
/*
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* Copyright (c) 2000,2005 Silicon Graphics, Inc.
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* All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef __XFS_EXTFREE_ITEM_H__
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#define __XFS_EXTFREE_ITEM_H__
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struct xfs_mount;
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struct kmem_zone;
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typedef struct xfs_extent {
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xfs_dfsbno_t ext_start;
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xfs_extlen_t ext_len;
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} xfs_extent_t;
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/*
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* This is the structure used to lay out an efi log item in the
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* log. The efi_extents field is a variable size array whose
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* size is given by efi_nextents.
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*/
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typedef struct xfs_efi_log_format {
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unsigned short efi_type; /* efi log item type */
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unsigned short efi_size; /* size of this item */
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uint efi_nextents; /* # extents to free */
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__uint64_t efi_id; /* efi identifier */
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xfs_extent_t efi_extents[1]; /* array of extents to free */
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} xfs_efi_log_format_t;
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/*
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* This is the structure used to lay out an efd log item in the
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* log. The efd_extents array is a variable size array whose
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* size is given by efd_nextents;
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*/
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typedef struct xfs_efd_log_format {
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unsigned short efd_type; /* efd log item type */
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unsigned short efd_size; /* size of this item */
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uint efd_nextents; /* # of extents freed */
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__uint64_t efd_efi_id; /* id of corresponding efi */
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xfs_extent_t efd_extents[1]; /* array of extents freed */
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} xfs_efd_log_format_t;
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#ifdef __KERNEL__
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/*
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* Max number of extents in fast allocation path.
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*/
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#define XFS_EFI_MAX_FAST_EXTENTS 16
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/*
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* Define EFI flags.
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*/
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#define XFS_EFI_RECOVERED 0x1
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#define XFS_EFI_COMMITTED 0x2
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#define XFS_EFI_CANCELED 0x4
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/*
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* This is the "extent free intention" log item. It is used
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* to log the fact that some extents need to be free. It is
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* used in conjunction with the "extent free done" log item
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* described below.
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*/
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typedef struct xfs_efi_log_item {
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xfs_log_item_t efi_item;
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uint efi_flags; /* misc flags */
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uint efi_next_extent;
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xfs_efi_log_format_t efi_format;
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} xfs_efi_log_item_t;
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/*
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* This is the "extent free done" log item. It is used to log
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* the fact that some extents earlier mentioned in an efi item
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* have been freed.
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*/
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typedef struct xfs_efd_log_item {
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xfs_log_item_t efd_item;
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xfs_efi_log_item_t *efd_efip;
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uint efd_next_extent;
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xfs_efd_log_format_t efd_format;
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} xfs_efd_log_item_t;
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/*
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* Max number of extents in fast allocation path.
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*/
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#define XFS_EFD_MAX_FAST_EXTENTS 16
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extern struct kmem_zone *xfs_efi_zone;
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extern struct kmem_zone *xfs_efd_zone;
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xfs_efi_log_item_t *xfs_efi_init(struct xfs_mount *, uint);
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xfs_efd_log_item_t *xfs_efd_init(struct xfs_mount *, xfs_efi_log_item_t *,
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uint);
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void xfs_efi_item_free(xfs_efi_log_item_t *);
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#endif /* __KERNEL__ */
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#endif /* __XFS_EXTFREE_ITEM_H__ */
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