db/agfl.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 "agfl.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 agfl_f(int argc, char **argv);
  47 static void agfl_help(void);
  48
  49 static const cmdinfo_t agfl_cmd =
  50         { "agfl", NULL, agfl_f, 0, 1, 1, "[agno]",
  51           "set address to agfl block", agfl_help };
  52
  53 const field_t   agfl_hfld[] = {
  54         { "", FLDT_AGFL, OI(0), C1, 0, TYP_NONE },
  55         { NULL }
  56 };
  57
  58 #define OFF(f)  bitize(offsetof(xfs_agfl_t, agfl_ ## f))
  59 const field_t   agfl_flds[] = {
  60         { "bno", FLDT_AGBLOCKNZ, OI(OFF(bno)), CI(XFS_AGFL_SIZE), FLD_ARRAY,
  61           TYP_DATA },
  62         { NULL }
  63 };
  64
  65 static void
  66 agfl_help(void)
  67 {
  68         dbprintf(
  69 "\n"
  70 " set allocation group freelist\n"
  71 "\n"
  72 " Example:\n"
  73 "\n"
  74 " agfl 5"
  75 "\n"
  76 " Located in the 4th 512 byte block of each allocation group,\n"
  77 " the agfl freelist for internal btree space allocation is maintained\n"
  78 " for each allocation group.  This acts as a reserved pool of space\n"
  79 " separate from the general filesystem freespace (not used for user data).\n"
  80 "\n"
  81 );
  82
  83 }
  84
  85 static int
  86 agfl_f(
  87         int             argc,
  88         char            **argv)
  89 {
  90         xfs_agnumber_t  agno;
  91         char            *p;
  92
  93         if (argc > 1) {
  94                 agno = (xfs_agnumber_t)strtoul(argv[1], &p, 0);
  95                 if (*p != '\0' || agno >= mp->m_sb.sb_agcount) {
  96                         dbprintf("bad allocation group number %s\n", argv[1]);
  97                         return 0;
  98                 }
  99                 cur_agno = agno;
 100         } else if (cur_agno == NULLAGNUMBER)
 101                 cur_agno = 0;
 102         ASSERT(typtab[TYP_AGFL].typnm == TYP_AGFL);
 103         set_cur(&typtab[TYP_AGFL], XFS_AG_DADDR(mp, cur_agno, XFS_AGFL_DADDR),
 104                 1, DB_RING_ADD, NULL);
 105         return 0;
 106 }
 107
 108 void
 109 agfl_init(void)
 110 {
 111         add_command(&agfl_cmd);
 112 }
 113
 114 /*ARGSUSED*/
 115 int
 116 agfl_size(
 117         void    *obj,
 118         int     startoff,
 119         int     idx)
 120 {
 121         return bitize(mp->m_sb.sb_sectsize);
 122 }