db/agi.c

   1 /*
   2  * Copyright (c) 2000-2001 Silicon Graphics, Inc.  All Rights Reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of version 2 of the GNU General Public License as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it would be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  11  *
  12  * Further, this software is distributed without any warranty that it is
  13  * free of the rightful claim of any third person regarding infringement
  14  * or the like.  Any license provided herein, whether implied or
  15  * otherwise, applies only to this software file.  Patent licenses, if
  16  * any, provided herein do not apply to combinations of this program with
  17  * other software, or any other product whatsoever.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, write the Free Software Foundation, Inc., 59
  21  * Temple Place - Suite 330, Boston MA 02111-1307, USA.
  22  *
  23  * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
  24  * Mountain View, CA  94043, or:
  25  *
  26  * http://www.sgi.com
  27  *
  28  * For further information regarding this notice, see:
  29  *
  30  * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
  31  */
  32
  33 #include <libxfs.h>
  34 #include "agi.h"
  35 #include "command.h"
  36 #include "type.h"
  37 #include "faddr.h"
  38 #include "fprint.h"
  39 #include "field.h"
  40 #include "io.h"
  41 #include "bit.h"
  42 #include "output.h"
  43 #include "init.h"
  44
  45 static int agi_f(int argc, char **argv);
  46 static void agi_help(void);
  47
  48 static const cmdinfo_t agi_cmd =
  49         { "agi", NULL, agi_f, 0, 1, 1, "[agno]",
  50           "set address to agi header", agi_help };
  51
  52 const field_t   agi_hfld[] = {
  53         { "", FLDT_AGI, OI(0), C1, 0, TYP_NONE },
  54         { NULL }
  55 };
  56
  57 #define OFF(f)  bitize(offsetof(xfs_agi_t, agi_ ## f))
  58 const field_t   agi_flds[] = {
  59         { "magicnum", FLDT_UINT32X, OI(OFF(magicnum)), C1, 0, TYP_NONE },
  60         { "versionnum", FLDT_UINT32D, OI(OFF(versionnum)), C1, 0, TYP_NONE },
  61         { "seqno", FLDT_AGNUMBER, OI(OFF(seqno)), C1, 0, TYP_NONE },
  62         { "length", FLDT_AGBLOCK, OI(OFF(length)), C1, 0, TYP_NONE },
  63         { "count", FLDT_AGINO, OI(OFF(count)), C1, 0, TYP_NONE },
  64         { "root", FLDT_AGBLOCK, OI(OFF(root)), C1, 0, TYP_INOBT },
  65         { "level", FLDT_UINT32D, OI(OFF(level)), C1, 0, TYP_NONE },
  66         { "freecount", FLDT_AGINO, OI(OFF(freecount)), C1, 0, TYP_NONE },
  67         { "newino", FLDT_AGINO, OI(OFF(newino)), C1, 0, TYP_INODE },
  68         { "dirino", FLDT_AGINO, OI(OFF(dirino)), C1, 0, TYP_INODE },
  69         { "unlinked", FLDT_AGINONN, OI(OFF(unlinked)),
  70           CI(XFS_AGI_UNLINKED_BUCKETS), FLD_ARRAY, TYP_NONE },
  71         { NULL }
  72 };
  73
  74 static void
  75 agi_help(void)
  76 {
  77         dbprintf(
  78 "\n"
  79 " set allocation group inode btree\n"
  80 "\n"
  81 " Example:\n"
  82 "\n"
  83 " agi 3 (set location to 3rd allocation group inode btree and type to 'agi')\n"
  84 "\n"
  85 " Located in the 3rd 512 byte block of each allocation group,\n"
  86 " the agi inode btree tracks all used/free inodes in the allocation group.\n"
  87 " Inodes are allocated in 16k 'chunks', each btree entry tracks a 'chunk'.\n"
  88 "\n"
  89 );
  90 }
  91
  92 static int
  93 agi_f(
  94         int             argc,
  95         char            **argv)
  96 {
  97         xfs_agnumber_t  agno;
  98         char            *p;
  99
 100         if (argc > 1) {
 101                 agno = (xfs_agnumber_t)strtoul(argv[1], &p, 0);
 102                 if (*p != '\0' || agno >= mp->m_sb.sb_agcount) {
 103                         dbprintf("bad allocation group number %s\n", argv[1]);
 104                         return 0;
 105                 }
 106                 cur_agno = agno;
 107         } else if (cur_agno == NULLAGNUMBER)
 108                 cur_agno = 0;
 109         ASSERT(typtab[TYP_AGI].typnm == TYP_AGI);
 110         set_cur(&typtab[TYP_AGI],
 111                 XFS_AG_DADDR(mp, cur_agno, XFS_AGI_DADDR(mp)),
 112                 XFS_FSS_TO_BB(mp, 1), DB_RING_ADD, NULL);
 113         return 0;
 114 }
 115
 116 void
 117 agi_init(void)
 118 {
 119         add_command(&agi_cmd);
 120 }
 121
 122 /*ARGSUSED*/
 123 int
 124 agi_size(
 125         void    *obj,
 126         int     startoff,
 127         int     idx)
 128 {
 129         return bitize(mp->m_sb.sb_sectsize);
 130 }