Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / fs / xfs / xfs_extfree_item.h

diff --git a/kernel/fs/xfs/xfs_extfree_item.h b/kernel/fs/xfs/xfs_extfree_item.h
new file mode 100644 (file)
index 0000000..0ffbce3
--- /dev/null
+++ b/kernel/fs/xfs/xfs_extfree_item.h
@@ -0,0 +1,81 @@
+/*
+ * Copyright (c) 2000,2005 Silicon Graphics, Inc.
+ * All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms 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.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write the Free Software Foundation,
+ * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+#ifndef        __XFS_EXTFREE_ITEM_H__
+#define        __XFS_EXTFREE_ITEM_H__
+
+/* kernel only EFI/EFD definitions */
+
+struct xfs_mount;
+struct kmem_zone;
+
+/*
+ * Max number of extents in fast allocation path.
+ */
+#define        XFS_EFI_MAX_FAST_EXTENTS        16
+
+/*
+ * Define EFI flag bits. Manipulated by set/clear/test_bit operators.
+ */
+#define        XFS_EFI_RECOVERED       1
+
+/*
+ * 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.
+ *
+ * The EFI is reference counted so that it is not freed prior to both the EFI
+ * and EFD being committed and unpinned. This ensures that when the last
+ * reference goes away the EFI will always be in the AIL as it has been
+ * unpinned, regardless of whether the EFD is processed before or after the EFI.
+ */
+typedef struct xfs_efi_log_item {
+       xfs_log_item_t          efi_item;
+       atomic_t                efi_refcount;
+       atomic_t                efi_next_extent;
+       unsigned long           efi_flags;      /* misc flags */
+       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);
+int                    xfs_efi_copy_format(xfs_log_iovec_t *buf,
+                                           xfs_efi_log_format_t *dst_efi_fmt);
+void                   xfs_efi_item_free(xfs_efi_log_item_t *);
+
+#endif /* __XFS_EXTFREE_ITEM_H__ */