1 files changed, 279 insertions, 0 deletions

diff --git a/fs/jfs/jfs_dtree.h b/fs/jfs/jfs_dtree.h
new file mode 100644
index 000000000000..273a80130c9d
--- /dev/null
+++ b/fs/jfs/jfs_dtree.h
@@ -0,0 +1,279 @@
+/*
+ *   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_DTREE
+#define _H_JFS_DTREE
+
+/*
+ *      jfs_dtree.h: directory B+-tree manager
+ */
+
+#include "jfs_btree.h"
+
+typedef union {
+        struct {
+                tid_t tid;
+                struct inode *ip;
+                u32 ino;
+        } leaf;
+        pxd_t xd;
+} ddata_t;
+
+
+/*
+ *      entry segment/slot
+ *
+ * an entry consists of type dependent head/only segment/slot and
+ * additional segments/slots linked vi next field;
+ * N.B. last/only segment of entry is terminated by next = -1;
+ */
+/*
+ *      directory page slot
+ */
+struct dtslot {
+        s8 next;                /* 1: */
+        s8 cnt;                 /* 1: */
+        __le16 name[15];        /* 30: */
+};                              /* (32) */
+
+
+#define DATASLOTSIZE    16
+#define L2DATASLOTSIZE  4
+#define DTSLOTSIZE      32
+#define L2DTSLOTSIZE    5
+#define DTSLOTHDRSIZE   2
+#define DTSLOTDATASIZE  30
+#define DTSLOTDATALEN   15
+
+/*
+ *       internal node entry head/only segment
+ */
+struct idtentry {
+        pxd_t xd;               /* 8: child extent descriptor */
+
+        s8 next;                /* 1: */
+        u8 namlen;              /* 1: */
+        __le16 name[11];        /* 22: 2-byte aligned */
+};                              /* (32) */
+
+#define DTIHDRSIZE      10
+#define DTIHDRDATALEN   11
+
+/* compute number of slots for entry */
+#define NDTINTERNAL(klen) ( ((4 + (klen)) + (15 - 1)) / 15 )
+
+
+/*
+ *      leaf node entry head/only segment
+ *
+ *      For legacy filesystems, name contains 13 wchars -- no index field
+ */
+struct ldtentry {
+        __le32 inumber;         /* 4: 4-byte aligned */
+        s8 next;                /* 1: */
+        u8 namlen;              /* 1: */
+        __le16 name[11];        /* 22: 2-byte aligned */
+        __le32 index;           /* 4: index into dir_table */
+};                              /* (32) */
+
+#define DTLHDRSIZE      6
+#define DTLHDRDATALEN_LEGACY    13      /* Old (OS/2) format */
+#define DTLHDRDATALEN   11
+
+/*
+ * dir_table used for directory traversal during readdir
+ */
+
+/*
+ * Keep persistent index for directory entries
+ */
+#define DO_INDEX(INODE) (JFS_SBI((INODE)->i_sb)->mntflag & JFS_DIR_INDEX)
+
+/*
+ * Maximum entry in inline directory table
+ */
+#define MAX_INLINE_DIRTABLE_ENTRY 13
+
+struct dir_table_slot {
+        u8 rsrvd;               /* 1: */
+        u8 flag;                /* 1: 0 if free */
+        u8 slot;                /* 1: slot within leaf page of entry */
+        u8 addr1;               /* 1: upper 8 bits of leaf page address */
+        __le32 addr2;           /* 4: lower 32 bits of leaf page address -OR-
+                                   index of next entry when this entry was deleted */
+};                              /* (8) */
+
+/*
+ * flag values
+ */
+#define DIR_INDEX_VALID 1
+#define DIR_INDEX_FREE 0
+
+#define DTSaddress(dir_table_slot, address64)\
+{\
+        (dir_table_slot)->addr1 = ((u64)address64) >> 32;\
+        (dir_table_slot)->addr2 = __cpu_to_le32((address64) & 0xffffffff);\
+}
+
+#define addressDTS(dts)\
+        ( ((s64)((dts)->addr1)) << 32 | __le32_to_cpu((dts)->addr2) )
+
+/* compute number of slots for entry */
+#define NDTLEAF_LEGACY(klen)    ( ((2 + (klen)) + (15 - 1)) / 15 )
+#define NDTLEAF NDTINTERNAL
+
+
+/*
+ *      directory root page (in-line in on-disk inode):
+ *
+ * cf. dtpage_t below.
+ */
+typedef union {
+        struct {
+                struct dasd DASD; /* 16: DASD limit/usage info */
+
+                u8 flag;        /* 1: */
+                u8 nextindex;   /* 1: next free entry in stbl */
+                s8 freecnt;     /* 1: free count */
+                s8 freelist;    /* 1: freelist header */
+
+                __le32 idotdot; /* 4: parent inode number */
+
+                s8 stbl[8];     /* 8: sorted entry index table */
+        } header;               /* (32) */
+
+        struct dtslot slot[9];
+} dtroot_t;
+
+#define PARENT(IP) \
+        (le32_to_cpu(JFS_IP(IP)->i_dtroot.header.idotdot))
+
+#define DTROOTMAXSLOT   9
+
+#define dtEmpty(IP) (JFS_IP(IP)->i_dtroot.header.nextindex == 0)
+
+
+/*
+ *      directory regular page:
+ *
+ *      entry slot array of 32 byte slot
+ *
+ * sorted entry slot index table (stbl):
+ * contiguous slots at slot specified by stblindex,
+ * 1-byte per entry
+ *   512 byte block:  16 entry tbl (1 slot)
+ *  1024 byte block:  32 entry tbl (1 slot)
+ *  2048 byte block:  64 entry tbl (2 slot)
+ *  4096 byte block: 128 entry tbl (4 slot)
+ *
+ * data area:
+ *   512 byte block:  16 - 2 =  14 slot
+ *  1024 byte block:  32 - 2 =  30 slot
+ *  2048 byte block:  64 - 3 =  61 slot
+ *  4096 byte block: 128 - 5 = 123 slot
+ *
+ * N.B. index is 0-based; index fields refer to slot index
+ * except nextindex which refers to entry index in stbl;
+ * end of entry stot list or freelist is marked with -1.
+ */
+typedef union {
+        struct {
+                __le64 next;    /* 8: next sibling */
+                __le64 prev;    /* 8: previous sibling */
+
+                u8 flag;        /* 1: */
+                u8 nextindex;   /* 1: next entry index in stbl */
+                s8 freecnt;     /* 1: */
+                s8 freelist;    /* 1: slot index of head of freelist */
+
+                u8 maxslot;     /* 1: number of slots in page slot[] */
+                u8 stblindex;   /* 1: slot index of start of stbl */
+                u8 rsrvd[2];    /* 2: */
+
+                pxd_t self;     /* 8: self pxd */
+        } header;               /* (32) */
+
+        struct dtslot slot[128];
+} dtpage_t;
+
+#define DTPAGEMAXSLOT        128
+
+#define DT8THPGNODEBYTES     512
+#define DT8THPGNODETSLOTS      1
+#define DT8THPGNODESLOTS      16
+
+#define DTQTRPGNODEBYTES    1024
+#define DTQTRPGNODETSLOTS      1
+#define DTQTRPGNODESLOTS      32
+
+#define DTHALFPGNODEBYTES   2048
+#define DTHALFPGNODETSLOTS     2
+#define DTHALFPGNODESLOTS     64
+
+#define DTFULLPGNODEBYTES   4096
+#define DTFULLPGNODETSLOTS     4
+#define DTFULLPGNODESLOTS    128
+
+#define DTENTRYSTART    1
+
+/* get sorted entry table of the page */
+#define DT_GETSTBL(p) ( ((p)->header.flag & BT_ROOT) ?\
+        ((dtroot_t *)(p))->header.stbl : \
+        (s8 *)&(p)->slot[(p)->header.stblindex] )
+
+/*
+ * Flags for dtSearch
+ */
+#define JFS_CREATE 1
+#define JFS_LOOKUP 2
+#define JFS_REMOVE 3
+#define JFS_RENAME 4
+
+#define DIRENTSIZ(namlen) \
+    ( (sizeof(struct dirent) - 2*(JFS_NAME_MAX+1) + 2*((namlen)+1) + 3) &~ 3 )
+
+/*
+ * Maximum file offset for directories.
+ */
+#define DIREND  INT_MAX
+
+/*
+ *      external declarations
+ */
+extern void dtInitRoot(tid_t tid, struct inode *ip, u32 idotdot);
+
+extern int dtSearch(struct inode *ip, struct component_name * key,
+                    ino_t * data, struct btstack * btstack, int flag);
+
+extern int dtInsert(tid_t tid, struct inode *ip, struct component_name * key,
+                    ino_t * ino, struct btstack * btstack);
+
+extern int dtDelete(tid_t tid, struct inode *ip, struct component_name * key,
+                    ino_t * data, int flag);
+
+extern int dtModify(tid_t tid, struct inode *ip, struct component_name * key,
+                    ino_t * orig_ino, ino_t new_ino, int flag);
+
+extern int jfs_readdir(struct file *filp, void *dirent, filldir_t filldir);
+
+#ifdef  _JFS_DEBUG_DTREE
+extern int dtDisplayTree(struct inode *ip);
+
+extern int dtDisplayPage(struct inode *ip, s64 bn, dtpage_t * p);
+#endif                          /* _JFS_DEBUG_DTREE */
+
+#endif                          /* !_H_JFS_DTREE */