db/agfl.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 <xfs/libxfs.h>
  34 #include "command.h"
  35 #include "type.h"
  36 #include "faddr.h"
  37 #include "fprint.h"
  38 #include "field.h"
  39 #include "io.h"
  40 #include "bit.h"
  41 #include "output.h"
  42 #include "init.h"
  43 #include "agfl.h"
  44
  45 static int agfl_bno_size(void *obj, int startoff);
  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)), agfl_bno_size,
  61           FLD_ARRAY|FLD_COUNT, TYP_DATA },
  62         { NULL }
  63 };
  64
  65 static int
  66 agfl_bno_size(
  67         void    *obj,
  68         int     startoff)
  69 {
  70         return XFS_AGFL_SIZE(mp);
  71 }
  72
  73 static void
  74 agfl_help(void)
  75 {
  76         dbprintf(
  77 "\n"
  78 " set allocation group freelist\n"
  79 "\n"
  80 " Example:\n"
  81 "\n"
  82 " agfl 5"
  83 "\n"
  84 " Located in the fourth sector of each allocation group,\n"
  85 " the agfl freelist for internal btree space allocation is maintained\n"
  86 " for each allocation group.  This acts as a reserved pool of space\n"
  87 " separate from the general filesystem freespace (not used for user data).\n"
  88 "\n"
  89 );
  90
  91 }
  92
  93 static int
  94 agfl_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_AGFL].typnm == TYP_AGFL);
 111         set_cur(&typtab[TYP_AGFL],
 112                 XFS_AG_DADDR(mp, cur_agno, XFS_AGFL_DADDR(mp)),
 113                 XFS_FSS_TO_BB(mp, 1), DB_RING_ADD, NULL);
 114         return 0;
 115 }
 116
 117 void
 118 agfl_init(void)
 119 {
 120         add_command(&agfl_cmd);
 121 }
 122
 123 /*ARGSUSED*/
 124 int
 125 agfl_size(
 126         void    *obj,
 127         int     startoff,
 128         int     idx)
 129 {
 130         return bitize(mp->m_sb.sb_sectsize);
 131 }