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-rw-r--r--fs/jfs/jfs_xtree.h104
1 files changed, 104 insertions, 0 deletions
diff --git a/fs/jfs/jfs_xtree.h b/fs/jfs/jfs_xtree.h
new file mode 100644
index 0000000000..ad7592191d
--- /dev/null
+++ b/fs/jfs/jfs_xtree.h
@@ -0,0 +1,104 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) International Business Machines Corp., 2000-2002
+ */
+#ifndef _H_JFS_XTREE
+#define _H_JFS_XTREE
+
+/*
+ * jfs_xtree.h: extent allocation descriptor B+-tree manager
+ */
+
+#include "jfs_btree.h"
+
+
+/*
+ * extent allocation descriptor (xad)
+ */
+typedef struct xad {
+ __u8 flag; /* 1: flag */
+ __u8 rsvrd[2]; /* 2: reserved */
+ __u8 off1; /* 1: offset in unit of fsblksize */
+ __le32 off2; /* 4: offset in unit of fsblksize */
+ pxd_t loc; /* 8: length and address in unit of fsblksize */
+} xad_t; /* (16) */
+
+#define MAXXLEN ((1 << 24) - 1)
+
+#define XTSLOTSIZE 16
+#define L2XTSLOTSIZE 4
+
+/* xad_t field construction */
+#define XADoffset(xad, offset64)\
+{\
+ (xad)->off1 = ((u64)offset64) >> 32;\
+ (xad)->off2 = __cpu_to_le32((offset64) & 0xffffffff);\
+}
+#define XADaddress(xad, address64) PXDaddress(&(xad)->loc, address64)
+#define XADlength(xad, length32) PXDlength(&(xad)->loc, length32)
+
+/* xad_t field extraction */
+#define offsetXAD(xad)\
+ ( ((s64)((xad)->off1)) << 32 | __le32_to_cpu((xad)->off2))
+#define addressXAD(xad) addressPXD(&(xad)->loc)
+#define lengthXAD(xad) lengthPXD(&(xad)->loc)
+
+/* xad list */
+struct xadlist {
+ s16 maxnxad;
+ s16 nxad;
+ xad_t *xad;
+};
+
+/* xad_t flags */
+#define XAD_NEW 0x01 /* new */
+#define XAD_EXTENDED 0x02 /* extended */
+#define XAD_COMPRESSED 0x04 /* compressed with recorded length */
+#define XAD_NOTRECORDED 0x08 /* allocated but not recorded */
+#define XAD_COW 0x10 /* copy-on-write */
+
+
+/* possible values for maxentry */
+#define XTROOTINITSLOT_DIR 6
+#define XTROOTINITSLOT 10
+#define XTROOTMAXSLOT 18
+#define XTPAGEMAXSLOT 256
+#define XTENTRYSTART 2
+
+/*
+ * xtree page:
+ */
+typedef union {
+ struct xtheader {
+ __le64 next; /* 8: */
+ __le64 prev; /* 8: */
+
+ u8 flag; /* 1: */
+ u8 rsrvd1; /* 1: */
+ __le16 nextindex; /* 2: next index = number of entries */
+ __le16 maxentry; /* 2: max number of entries */
+ __le16 rsrvd2; /* 2: */
+
+ pxd_t self; /* 8: self */
+ } header; /* (32) */
+
+ xad_t xad[XTROOTMAXSLOT]; /* 16 * maxentry: xad array */
+} xtpage_t;
+
+/*
+ * external declaration
+ */
+extern int xtLookup(struct inode *ip, s64 lstart, s64 llen,
+ int *pflag, s64 * paddr, int *plen, int flag);
+extern void xtInitRoot(tid_t tid, struct inode *ip);
+extern int xtInsert(tid_t tid, struct inode *ip,
+ int xflag, s64 xoff, int xlen, s64 * xaddrp, int flag);
+extern int xtExtend(tid_t tid, struct inode *ip, s64 xoff, int xlen,
+ int flag);
+extern int xtUpdate(tid_t tid, struct inode *ip, struct xad *nxad);
+extern s64 xtTruncate(tid_t tid, struct inode *ip, s64 newsize, int type);
+extern s64 xtTruncate_pmap(tid_t tid, struct inode *ip, s64 committed_size);
+extern int xtAppend(tid_t tid,
+ struct inode *ip, int xflag, s64 xoff, int maxblocks,
+ int *xlenp, s64 * xaddrp, int flag);
+#endif /* !_H_JFS_XTREE */