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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /fs/xfs/xfs_extfree_item.h
downloadlinux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.bz2
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
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+/*
+ * Copyright (c) 2000 Silicon Graphics, Inc. All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * Further, this software is distributed without any warranty that it is
+ * free of the rightful claim of any third person regarding infringement
+ * or the like. Any license provided herein, whether implied or
+ * otherwise, applies only to this software file. Patent licenses, if
+ * any, provided herein do not apply to combinations of this program with
+ * other software, or any other product whatsoever.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write the Free Software Foundation, Inc., 59
+ * Temple Place - Suite 330, Boston MA 02111-1307, USA.
+ *
+ * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
+ * Mountain View, CA 94043, or:
+ *
+ * http://www.sgi.com
+ *
+ * For further information regarding this notice, see:
+ *
+ * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
+ */
+#ifndef __XFS_EXTFREE_ITEM_H__
+#define __XFS_EXTFREE_ITEM_H__
+
+struct xfs_mount;
+struct kmem_zone;
+
+typedef struct xfs_extent {
+ xfs_dfsbno_t ext_start;
+ xfs_extlen_t ext_len;
+} xfs_extent_t;
+
+/*
+ * This is the structure used to lay out an efi log item in the
+ * log. The efi_extents field is a variable size array whose
+ * size is given by efi_nextents.
+ */
+typedef struct xfs_efi_log_format {
+ unsigned short efi_type; /* efi log item type */
+ unsigned short efi_size; /* size of this item */
+ uint efi_nextents; /* # extents to free */
+ __uint64_t efi_id; /* efi identifier */
+ xfs_extent_t efi_extents[1]; /* array of extents to free */
+} xfs_efi_log_format_t;
+
+/*
+ * This is the structure used to lay out an efd log item in the
+ * log. The efd_extents array is a variable size array whose
+ * size is given by efd_nextents;
+ */
+typedef struct xfs_efd_log_format {
+ unsigned short efd_type; /* efd log item type */
+ unsigned short efd_size; /* size of this item */
+ uint efd_nextents; /* # of extents freed */
+ __uint64_t efd_efi_id; /* id of corresponding efi */
+ xfs_extent_t efd_extents[1]; /* array of extents freed */
+} xfs_efd_log_format_t;
+
+
+#ifdef __KERNEL__
+
+/*
+ * Max number of extents in fast allocation path.
+ */
+#define XFS_EFI_MAX_FAST_EXTENTS 16
+
+/*
+ * Define EFI flags.
+ */
+#define XFS_EFI_RECOVERED 0x1
+#define XFS_EFI_COMMITTED 0x2
+#define XFS_EFI_CANCELED 0x4
+
+/*
+ * This is the "extent free intention" log item. It is used
+ * to log the fact that some extents need to be free. It is
+ * used in conjunction with the "extent free done" log item
+ * described below.
+ */
+typedef struct xfs_efi_log_item {
+ xfs_log_item_t efi_item;
+ uint efi_flags; /* misc flags */
+ uint efi_next_extent;
+ xfs_efi_log_format_t efi_format;
+} xfs_efi_log_item_t;
+
+/*
+ * This is the "extent free done" log item. It is used to log
+ * the fact that some extents earlier mentioned in an efi item
+ * have been freed.
+ */
+typedef struct xfs_efd_log_item {
+ xfs_log_item_t efd_item;
+ xfs_efi_log_item_t *efd_efip;
+ uint efd_next_extent;
+ xfs_efd_log_format_t efd_format;
+} xfs_efd_log_item_t;
+
+/*
+ * Max number of extents in fast allocation path.
+ */
+#define XFS_EFD_MAX_FAST_EXTENTS 16
+
+extern struct kmem_zone *xfs_efi_zone;
+extern struct kmem_zone *xfs_efd_zone;
+
+xfs_efi_log_item_t *xfs_efi_init(struct xfs_mount *, uint);
+xfs_efd_log_item_t *xfs_efd_init(struct xfs_mount *, xfs_efi_log_item_t *,
+ uint);
+
+#endif /* __KERNEL__ */
+
+#endif /* __XFS_EXTFREE_ITEM_H__ */