db/agf.c

   1 /*
   2  * Copyright (c) 2000-2001,2005 Silicon Graphics, Inc.
   3  * All Rights Reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it would be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write the Free Software Foundation,
  16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18
  19 #include <xfs/libxfs.h>
  20 #include "command.h"
  21 #include "type.h"
  22 #include "faddr.h"
  23 #include "fprint.h"
  24 #include "field.h"
  25 #include "io.h"
  26 #include "bit.h"
  27 #include "output.h"
  28 #include "init.h"
  29 #include "agf.h"
  30
  31 static int agf_f(int argc, char **argv);
  32 static void agf_help(void);
  33
  34 static const cmdinfo_t agf_cmd =
  35         { "agf", NULL, agf_f, 0, 1, 1, "[agno]",
  36           "set address to agf header", agf_help };
  37
  38 const field_t   agf_hfld[] = {
  39         { "", FLDT_AGF, OI(0), C1, 0, TYP_NONE },
  40         { NULL }
  41 };
  42
  43 #define OFF(f)  bitize(offsetof(xfs_agf_t, agf_ ## f))
  44 #define SZ(f)   bitszof(xfs_agf_t, agf_ ## f)
  45 const field_t   agf_flds[] = {
  46         { "magicnum", FLDT_UINT32X, OI(OFF(magicnum)), C1, 0, TYP_NONE },
  47         { "versionnum", FLDT_UINT32D, OI(OFF(versionnum)), C1, 0, TYP_NONE },
  48         { "seqno", FLDT_AGNUMBER, OI(OFF(seqno)), C1, 0, TYP_NONE },
  49         { "length", FLDT_AGBLOCK, OI(OFF(length)), C1, 0, TYP_NONE },
  50         { "roots", FLDT_AGBLOCK, OI(OFF(roots)), CI(XFS_BTNUM_AGF),
  51           FLD_ARRAY|FLD_SKIPALL, TYP_NONE },
  52         { "bnoroot", FLDT_AGBLOCK,
  53           OI(OFF(roots) + XFS_BTNUM_BNO * SZ(roots[XFS_BTNUM_BNO])), C1, 0,
  54           TYP_BNOBT },
  55         { "cntroot", FLDT_AGBLOCK,
  56           OI(OFF(roots) + XFS_BTNUM_CNT * SZ(roots[XFS_BTNUM_CNT])), C1, 0,
  57           TYP_CNTBT },
  58         { "levels", FLDT_UINT32D, OI(OFF(levels)), CI(XFS_BTNUM_AGF),
  59           FLD_ARRAY|FLD_SKIPALL, TYP_NONE },
  60         { "bnolevel", FLDT_UINT32D,
  61           OI(OFF(levels) + XFS_BTNUM_BNO * SZ(levels[XFS_BTNUM_BNO])), C1, 0,
  62           TYP_NONE },
  63         { "cntlevel", FLDT_UINT32D,
  64           OI(OFF(levels) + XFS_BTNUM_CNT * SZ(levels[XFS_BTNUM_CNT])), C1, 0,
  65           TYP_NONE },
  66         { "flfirst", FLDT_UINT32D, OI(OFF(flfirst)), C1, 0, TYP_NONE },
  67         { "fllast", FLDT_UINT32D, OI(OFF(fllast)), C1, 0, TYP_NONE },
  68         { "flcount", FLDT_UINT32D, OI(OFF(flcount)), C1, 0, TYP_NONE },
  69         { "freeblks", FLDT_EXTLEN, OI(OFF(freeblks)), C1, 0, TYP_NONE },
  70         { "longest", FLDT_EXTLEN, OI(OFF(longest)), C1, 0, TYP_NONE },
  71         { "btreeblks", FLDT_UINT32D, OI(OFF(btreeblks)), C1, 0, TYP_NONE },
  72         { NULL }
  73 };
  74
  75 static void
  76 agf_help(void)
  77 {
  78         dbprintf(
  79 "\n"
  80 " set allocation group free block list\n"
  81 "\n"
  82 " Example:\n"
  83 "\n"
  84 " agf 2 - move location to AGF in 2nd filesystem allocation group\n"
  85 "\n"
  86 " Located in the second sector of each allocation group, the AGF\n"
  87 " contains the root of two different freespace btrees:\n"
  88 " The 'cnt' btree keeps track freespace indexed on section size.\n"
  89 " The 'bno' btree tracks sections of freespace indexed on block number.\n"
  90 );
  91 }
  92
  93 static int
  94 agf_f(
  95         int             argc,
  96         char            **argv)
  97 {
  98         xfs_agnumber_t  agno;
  99         char            *p;
 100
 101         if (argc > 1) {
 102                 agno = (xfs_agnumber_t)strtoul(argv[1], &p, 0);
 103                 if (*p != '\0' || agno >= mp->m_sb.sb_agcount) {
 104                         dbprintf("bad allocation group number %s\n", argv[1]);
 105                         return 0;
 106                 }
 107                 cur_agno = agno;
 108         } else if (cur_agno == NULLAGNUMBER)
 109                 cur_agno = 0;
 110         ASSERT(typtab[TYP_AGF].typnm == TYP_AGF);
 111         set_cur(&typtab[TYP_AGF],
 112                 XFS_AG_DADDR(mp, cur_agno, XFS_AGF_DADDR(mp)),
 113                 XFS_FSS_TO_BB(mp, 1), DB_RING_ADD, NULL);
 114         return 0;
 115 }
 116
 117 void
 118 agf_init(void)
 119 {
 120         add_command(&agf_cmd);
 121 }
 122
 123 int
 124 agf_size(
 125         void    *obj,
 126         int     startoff,
 127         int     idx)
 128 {
 129         return bitize(mp->m_sb.sb_sectsize);
 130 }