1 files changed, 140 insertions, 0 deletions

diff --git a/fs/jfs/jfs_xtree.h b/fs/jfs/jfs_xtree.h
new file mode 100644
index 000000000000..a69784254fe7
--- /dev/null
+++ b/fs/jfs/jfs_xtree.h
@@ -0,0 +1,140 @@
+/*
+ *   Copyright (c) International Business Machines Corp., 2000-2002
+ *
+ *   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; either version 2 of the License, or 
+ *   (at your option) any later version.
+ * 
+ *   This program is distributed in the hope that it will 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 to the Free Software 
+ *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+#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 {
+        unsigned flag:8;        /* 1: flag */
+        unsigned rsvrd:16;      /* 2: reserved */
+        unsigned off1:8;        /* 1: offset in unit of fsblksize */
+        __le32 off2;            /* 4: offset in unit of fsblksize */
+        unsigned len:24;        /* 3: length in unit of fsblksize */
+        unsigned addr1:8;       /* 1: address in unit of fsblksize */
+        __le32 addr2;           /* 4: 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)\
+{\
+        (xad)->addr1 = ((u64)address64) >> 32;\
+        (xad)->addr2 = __cpu_to_le32((address64) & 0xffffffff);\
+}
+#define XADlength(xad, length32)        (xad)->len = __cpu_to_le24(length32)
+
+/* xad_t field extraction */
+#define offsetXAD(xad)\
+        ( ((s64)((xad)->off1)) << 32 | __le32_to_cpu((xad)->off2))
+#define addressXAD(xad)\
+        ( ((s64)((xad)->addr1)) << 32 | __le32_to_cpu((xad)->addr2))
+#define lengthXAD(xad)  __le24_to_cpu((xad)->len)
+
+/* 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 int xtLookupList(struct inode *ip, struct lxdlist * lxdlist,
+                        struct xadlist * xadlist, 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);
+#ifdef _NOTYET
+extern int xtTailgate(tid_t tid, struct inode *ip,
+                      s64 xoff, int xlen, s64 xaddr, int flag);
+#endif
+extern int xtUpdate(tid_t tid, struct inode *ip, struct xad *nxad);
+extern int xtDelete(tid_t tid, struct inode *ip, s64 xoff, int xlen,
+                    int flag);
+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 xtRelocate(tid_t tid, struct inode *ip,
+                      xad_t * oxad, s64 nxaddr, int xtype);
+extern int xtAppend(tid_t tid,
+                    struct inode *ip, int xflag, s64 xoff, int maxblocks,
+                    int *xlenp, s64 * xaddrp, int flag);
+
+#ifdef  _JFS_DEBUG_XTREE
+extern int xtDisplayTree(struct inode *ip);
+extern int xtDisplayPage(struct inode *ip, s64 bn, xtpage_t * p);
+#endif                          /* _JFS_DEBUG_XTREE */
+
+#endif                          /* !_H_JFS_XTREE */