db/agi.c

   1 /*
   2  * Copyright (c) 2000 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 "data.h"
  37 #include "type.h"
  38 #include "faddr.h"
  39 #include "fprint.h"
  40 #include "field.h"
  41 #include "io.h"
  42 #include "bit.h"
  43 #include "output.h"
  44 #include "mount.h"
  45
  46 static int agi_f(int argc, char **argv);
  47 static void agi_help(void);
  48
  49 static const cmdinfo_t agi_cmd =
  50         { "agi", NULL, agi_f, 0, 1, 1, "[agno]",
  51           "set address to agi header", agi_help };
  52
  53 const field_t   agi_hfld[] = {
  54         { "", FLDT_AGI, OI(0), C1, 0, TYP_NONE },
  55         { NULL }
  56 };
  57
  58 #define OFF(f)  bitize(offsetof(xfs_agi_t, agi_ ## f))
  59 const field_t   agi_flds[] = {
  60         { "magicnum", FLDT_UINT32X, OI(OFF(magicnum)), C1, 0, TYP_NONE },
  61         { "versionnum", FLDT_UINT32D, OI(OFF(versionnum)), C1, 0, TYP_NONE },
  62         { "seqno", FLDT_AGNUMBER, OI(OFF(seqno)), C1, 0, TYP_NONE },
  63         { "length", FLDT_AGBLOCK, OI(OFF(length)), C1, 0, TYP_NONE },
  64         { "count", FLDT_AGINO, OI(OFF(count)), C1, 0, TYP_NONE },
  65         { "root", FLDT_AGBLOCK, OI(OFF(root)), C1, 0, TYP_INOBT },
  66         { "level", FLDT_UINT32D, OI(OFF(level)), C1, 0, TYP_NONE },
  67         { "freecount", FLDT_AGINO, OI(OFF(freecount)), C1, 0, TYP_NONE },
  68         { "newino", FLDT_AGINO, OI(OFF(newino)), C1, 0, TYP_INODE },
  69         { "dirino", FLDT_AGINO, OI(OFF(dirino)), C1, 0, TYP_INODE },
  70         { "unlinked", FLDT_AGINONN, OI(OFF(unlinked)),
  71           CI(XFS_AGI_UNLINKED_BUCKETS), FLD_ARRAY, TYP_NONE },
  72         { NULL }
  73 };
  74
  75 static void
  76 agi_help(void)
  77 {
  78         dbprintf(
  79 "\n"
  80 " set allocation group inode btree\n"
  81 "\n"
  82 " Example:\n"
  83 "\n"
  84 " agi 3 (set location to 3rd allocation group inode btree and type to 'agi')\n"
  85 "\n"
  86 " Located in the 3rd 512 byte block of each allocation group,\n"
  87 " the agi inode btree tracks all used/free inodes in the allocation group.\n"
  88 " Inodes are allocated in 16k 'chunks', each btree entry tracks a 'chunk'.\n"
  89 "\n"
  90 );
  91 }
  92
  93 static int
  94 agi_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_AGI].typnm == TYP_AGI);
 111         set_cur(&typtab[TYP_AGI], XFS_AG_DADDR(mp, cur_agno, XFS_AGI_DADDR), 1,
 112                 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 }