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!

1 files changed, 314 insertions, 0 deletions

diff --git a/fs/jfs/jfs_dmap.h b/fs/jfs/jfs_dmap.h
new file mode 100644
index 000000000000..32e25884e7e8
--- /dev/null
+++ b/fs/jfs/jfs_dmap.h
@@ -0,0 +1,314 @@
+/*
+ *   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_DMAP
+#define _H_JFS_DMAP
+
+#include "jfs_txnmgr.h"
+
+#define BMAPVERSION     1       /* version number */
+#define TREESIZE        (256+64+16+4+1) /* size of a dmap tree */
+#define LEAFIND         (64+16+4+1)     /* index of 1st leaf of a dmap tree */
+#define LPERDMAP        256     /* num leaves per dmap tree */
+#define L2LPERDMAP      8       /* l2 number of leaves per dmap tree */
+#define DBWORD          32      /* # of blks covered by a map word */
+#define L2DBWORD        5       /* l2 # of blks covered by a mword */
+#define BUDMIN          L2DBWORD        /* max free string in a map word */
+#define BPERDMAP        (LPERDMAP * DBWORD)     /* num of blks per dmap */
+#define L2BPERDMAP      13      /* l2 num of blks per dmap */
+#define CTLTREESIZE     (1024+256+64+16+4+1)    /* size of a dmapctl tree */
+#define CTLLEAFIND      (256+64+16+4+1) /* idx of 1st leaf of a dmapctl tree */
+#define LPERCTL         1024    /* num of leaves per dmapctl tree */
+#define L2LPERCTL       10      /* l2 num of leaves per dmapctl tree */
+#define ROOT            0       /* index of the root of a tree */
+#define NOFREE          ((s8) -1)       /* no blocks free */
+#define MAXAG           128     /* max number of allocation groups */
+#define L2MAXAG         7       /* l2 max num of AG */
+#define L2MINAGSZ       25      /* l2 of minimum AG size in bytes */
+#define BMAPBLKNO       0       /* lblkno of bmap within the map */
+
+/*
+ * maximum l2 number of disk blocks at the various dmapctl levels.
+ */
+#define L2MAXL0SIZE     (L2BPERDMAP + 1 * L2LPERCTL)
+#define L2MAXL1SIZE     (L2BPERDMAP + 2 * L2LPERCTL)
+#define L2MAXL2SIZE     (L2BPERDMAP + 3 * L2LPERCTL)
+
+/*
+ * maximum number of disk blocks at the various dmapctl levels.
+ */
+#define MAXL0SIZE       ((s64)1 << L2MAXL0SIZE)
+#define MAXL1SIZE       ((s64)1 << L2MAXL1SIZE)
+#define MAXL2SIZE       ((s64)1 << L2MAXL2SIZE)
+
+#define MAXMAPSIZE      MAXL2SIZE       /* maximum aggregate map size */
+
+/* 
+ * determine the maximum free string for four (lower level) nodes
+ * of the tree.
+ */
+static __inline signed char TREEMAX(signed char *cp)
+{
+        signed char tmp1, tmp2;
+
+        tmp1 = max(*(cp+2), *(cp+3));
+        tmp2 = max(*(cp), *(cp+1));
+
+        return max(tmp1, tmp2);
+}
+
+/*
+ * convert disk block number to the logical block number of the dmap
+ * describing the disk block.  s is the log2(number of logical blocks per page)
+ *
+ * The calculation figures out how many logical pages are in front of the dmap.
+ *      - the number of dmaps preceding it
+ *      - the number of L0 pages preceding its L0 page
+ *      - the number of L1 pages preceding its L1 page
+ *      - 3 is added to account for the L2, L1, and L0 page for this dmap
+ *      - 1 is added to account for the control page of the map.
+ */
+#define BLKTODMAP(b,s)    \
+        ((((b) >> 13) + ((b) >> 23) + ((b) >> 33) + 3 + 1) << (s))
+
+/*
+ * convert disk block number to the logical block number of the LEVEL 0
+ * dmapctl describing the disk block.  s is the log2(number of logical blocks
+ * per page)
+ *
+ * The calculation figures out how many logical pages are in front of the L0.
+ *      - the number of dmap pages preceding it
+ *      - the number of L0 pages preceding it
+ *      - the number of L1 pages preceding its L1 page
+ *      - 2 is added to account for the L2, and L1 page for this L0
+ *      - 1 is added to account for the control page of the map.
+ */
+#define BLKTOL0(b,s)      \
+        (((((b) >> 23) << 10) + ((b) >> 23) + ((b) >> 33) + 2 + 1) << (s))
+
+/*
+ * convert disk block number to the logical block number of the LEVEL 1
+ * dmapctl describing the disk block.  s is the log2(number of logical blocks
+ * per page)
+ *
+ * The calculation figures out how many logical pages are in front of the L1.
+ *      - the number of dmap pages preceding it
+ *      - the number of L0 pages preceding it
+ *      - the number of L1 pages preceding it
+ *      - 1 is added to account for the L2 page
+ *      - 1 is added to account for the control page of the map.
+ */
+#define BLKTOL1(b,s)      \
+     (((((b) >> 33) << 20) + (((b) >> 33) << 10) + ((b) >> 33) + 1 + 1) << (s))
+
+/*
+ * convert disk block number to the logical block number of the dmapctl
+ * at the specified level which describes the disk block.
+ */
+#define BLKTOCTL(b,s,l)   \
+        (((l) == 2) ? 1 : ((l) == 1) ? BLKTOL1((b),(s)) : BLKTOL0((b),(s)))
+
+/* 
+ * convert aggregate map size to the zero origin dmapctl level of the
+ * top dmapctl.
+ */
+#define BMAPSZTOLEV(size)       \
+        (((size) <= MAXL0SIZE) ? 0 : ((size) <= MAXL1SIZE) ? 1 : 2)
+
+/* convert disk block number to allocation group number.
+ */
+#define BLKTOAG(b,sbi)  ((b) >> ((sbi)->bmap->db_agl2size))
+
+/* convert allocation group number to starting disk block
+ * number.
+ */
+#define AGTOBLK(a,ip)   \
+        ((s64)(a) << (JFS_SBI((ip)->i_sb)->bmap->db_agl2size))
+
+/*
+ *      dmap summary tree
+ *
+ * dmaptree must be consistent with dmapctl.
+ */
+struct dmaptree {
+        __le32 nleafs;          /* 4: number of tree leafs      */
+        __le32 l2nleafs;        /* 4: l2 number of tree leafs   */
+        __le32 leafidx;         /* 4: index of first tree leaf  */
+        __le32 height;          /* 4: height of the tree        */
+        s8 budmin;              /* 1: min l2 tree leaf value to combine */
+        s8 stree[TREESIZE];     /* TREESIZE: tree               */
+        u8 pad[2];              /* 2: pad to word boundary      */
+};                              /* - 360 -                      */
+
+/*
+ *      dmap page per 8K blocks bitmap
+ */
+struct dmap {
+        __le32 nblocks;         /* 4: num blks covered by this dmap     */
+        __le32 nfree;           /* 4: num of free blks in this dmap     */
+        __le64 start;           /* 8: starting blkno for this dmap      */
+        struct dmaptree tree;   /* 360: dmap tree                       */
+        u8 pad[1672];           /* 1672: pad to 2048 bytes              */
+        __le32 wmap[LPERDMAP];  /* 1024: bits of the working map        */
+        __le32 pmap[LPERDMAP];  /* 1024: bits of the persistent map     */
+};                              /* - 4096 -                             */
+
+/*
+ *      disk map control page per level.
+ *
+ * dmapctl must be consistent with dmaptree.
+ */
+struct dmapctl {
+        __le32 nleafs;          /* 4: number of tree leafs      */
+        __le32 l2nleafs;        /* 4: l2 number of tree leafs   */
+        __le32 leafidx;         /* 4: index of the first tree leaf      */
+        __le32 height;          /* 4: height of tree            */
+        s8 budmin;              /* 1: minimum l2 tree leaf value        */
+        s8 stree[CTLTREESIZE];  /* CTLTREESIZE: dmapctl tree    */
+        u8 pad[2714];           /* 2714: pad to 4096            */
+};                              /* - 4096 -                     */
+
+/*
+ *      common definition for dmaptree within dmap and dmapctl
+ */
+typedef union dmtree {
+        struct dmaptree t1;
+        struct dmapctl t2;
+} dmtree_t;
+
+/* macros for accessing fields within dmtree */
+#define dmt_nleafs      t1.nleafs
+#define dmt_l2nleafs    t1.l2nleafs
+#define dmt_leafidx     t1.leafidx
+#define dmt_height      t1.height
+#define dmt_budmin      t1.budmin
+#define dmt_stree       t1.stree
+
+/* 
+ *      on-disk aggregate disk allocation map descriptor.
+ */
+struct dbmap_disk {
+        __le64 dn_mapsize;      /* 8: number of blocks in aggregate     */
+        __le64 dn_nfree;        /* 8: num free blks in aggregate map    */
+        __le32 dn_l2nbperpage;  /* 4: number of blks per page           */
+        __le32 dn_numag;        /* 4: total number of ags               */
+        __le32 dn_maxlevel;     /* 4: number of active ags              */
+        __le32 dn_maxag;        /* 4: max active alloc group number     */
+        __le32 dn_agpref;       /* 4: preferred alloc group (hint)      */
+        __le32 dn_aglevel;      /* 4: dmapctl level holding the AG      */
+        __le32 dn_agheigth;     /* 4: height in dmapctl of the AG       */
+        __le32 dn_agwidth;      /* 4: width in dmapctl of the AG        */
+        __le32 dn_agstart;      /* 4: start tree index at AG height     */
+        __le32 dn_agl2size;     /* 4: l2 num of blks per alloc group    */
+        __le64 dn_agfree[MAXAG];/* 8*MAXAG: per AG free count           */
+        __le64 dn_agsize;       /* 8: num of blks per alloc group       */
+        s8 dn_maxfreebud;       /* 1: max free buddy system             */
+        u8 pad[3007];           /* 3007: pad to 4096                    */
+};                              /* - 4096 -                             */
+
+struct dbmap {
+        s64 dn_mapsize;         /* number of blocks in aggregate     */
+        s64 dn_nfree;           /* num free blks in aggregate map    */
+        int dn_l2nbperpage;     /* number of blks per page           */
+        int dn_numag;           /* total number of ags               */
+        int dn_maxlevel;        /* number of active ags              */
+        int dn_maxag;           /* max active alloc group number     */
+        int dn_agpref;          /* preferred alloc group (hint)      */
+        int dn_aglevel;         /* dmapctl level holding the AG      */
+        int dn_agheigth;        /* height in dmapctl of the AG       */
+        int dn_agwidth;         /* width in dmapctl of the AG        */
+        int dn_agstart;         /* start tree index at AG height     */
+        int dn_agl2size;        /* l2 num of blks per alloc group    */
+        s64 dn_agfree[MAXAG];   /* per AG free count           */
+        s64 dn_agsize;          /* num of blks per alloc group       */
+        signed char dn_maxfreebud;      /* max free buddy system             */
+};                              /* - 4096 -                             */
+/* 
+ *      in-memory aggregate disk allocation map descriptor.
+ */
+struct bmap {
+        struct dbmap db_bmap;           /* on-disk aggregate map descriptor */
+        struct inode *db_ipbmap;        /* ptr to aggregate map incore inode */
+        struct semaphore db_bmaplock;   /* aggregate map lock */
+        atomic_t db_active[MAXAG];      /* count of active, open files in AG */
+        u32 *db_DBmap;
+};
+
+/* macros for accessing fields within in-memory aggregate map descriptor */
+#define db_mapsize      db_bmap.dn_mapsize
+#define db_nfree        db_bmap.dn_nfree
+#define db_agfree       db_bmap.dn_agfree
+#define db_agsize       db_bmap.dn_agsize
+#define db_agl2size     db_bmap.dn_agl2size
+#define db_agwidth      db_bmap.dn_agwidth
+#define db_agheigth     db_bmap.dn_agheigth
+#define db_agstart      db_bmap.dn_agstart
+#define db_numag        db_bmap.dn_numag
+#define db_maxlevel     db_bmap.dn_maxlevel
+#define db_aglevel      db_bmap.dn_aglevel
+#define db_agpref       db_bmap.dn_agpref
+#define db_maxag        db_bmap.dn_maxag
+#define db_maxfreebud   db_bmap.dn_maxfreebud
+#define db_l2nbperpage  db_bmap.dn_l2nbperpage
+
+/*
+ * macros for various conversions needed by the allocators.
+ * blkstol2(), cntlz(), and cnttz() are operating system dependent functions.
+ */
+/* convert number of blocks to log2 number of blocks, rounding up to
+ * the next log2 value if blocks is not a l2 multiple.
+ */
+#define BLKSTOL2(d)             (blkstol2(d))
+
+/* convert number of leafs to log2 leaf value */
+#define NLSTOL2BSZ(n)           (31 - cntlz((n)) + BUDMIN)
+
+/* convert leaf index to log2 leaf value */
+#define LITOL2BSZ(n,m,b)        ((((n) == 0) ? (m) : cnttz((n))) + (b))
+
+/* convert a block number to a dmap control leaf index */
+#define BLKTOCTLLEAF(b,m)       \
+        (((b) & (((s64)1 << ((m) + L2LPERCTL)) - 1)) >> (m))
+
+/* convert log2 leaf value to buddy size */
+#define BUDSIZE(s,m)            (1 << ((s) - (m)))
+
+/*
+ *      external references.
+ */
+extern int dbMount(struct inode *ipbmap);
+
+extern int dbUnmount(struct inode *ipbmap, int mounterror);
+
+extern int dbFree(struct inode *ipbmap, s64 blkno, s64 nblocks);
+
+extern int dbUpdatePMap(struct inode *ipbmap,
+                        int free, s64 blkno, s64 nblocks, struct tblock * tblk);
+
+extern int dbNextAG(struct inode *ipbmap);
+
+extern int dbAlloc(struct inode *ipbmap, s64 hint, s64 nblocks, s64 * results);
+
+extern int dbReAlloc(struct inode *ipbmap,
+                     s64 blkno, s64 nblocks, s64 addnblocks, s64 * results);
+
+extern int dbSync(struct inode *ipbmap);
+extern int dbAllocBottomUp(struct inode *ip, s64 blkno, s64 nblocks);
+extern int dbExtendFS(struct inode *ipbmap, s64 blkno, s64 nblocks);
+extern void dbFinalizeBmap(struct inode *ipbmap);
+extern s64 dbMapFileSizeToMapSize(struct inode *ipbmap);
+#endif                          /* _H_JFS_DMAP */