spaceman/info.c

   1 /*
   2  * Copyright (C) 2018 Oracle.  All Rights Reserved.
   3  *
   4  * Author: Darrick J. Wong <darrick.wong@oracle.com>
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version 2
   9  * of the License, or (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it would be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write the Free Software Foundation,
  18  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301, USA.
  19  */
  20 #include "libxfs.h"
  21 #include "command.h"
  22 #include "init.h"
  23 #include "path.h"
  24 #include "space.h"
  25 #include "fsgeom.h"
  26
  27 static void
  28 info_help(void)
  29 {
  30         printf(_(
  31 "\n"
  32 " Pretty-prints the filesystem geometry as derived from the superblock.\n"
  33 " The output has the same format as mkfs.xfs, xfs_info, and other utilities.\n"
  34 " The opened file must be an XFS mount point.\n"
  35 "\n"
  36 ));
  37
  38 }
  39
  40 static int
  41 info_f(
  42         int                     argc,
  43         char                    **argv)
  44 {
  45         struct xfs_fsop_geom    geo;
  46         int                     error;
  47
  48         if (fs_table_lookup_mount(file->name) == NULL) {
  49                 fprintf(stderr, _("%s: Not a XFS mount point.\n"), file->name);
  50                 return 1;
  51         }
  52
  53         /* get the current filesystem size & geometry */
  54         error = ioctl(file->fd, XFS_IOC_FSGEOMETRY, &geo);
  55         if (error) {
  56                 /*
  57                  * OK, new xfsctl barfed - back off and try earlier version
  58                  * as we're probably running an older kernel version.
  59                  * Only field added in the v2 geometry xfsctl is "logsunit"
  60                  * so we'll zero that out for later display (as zero).
  61                  */
  62                 geo.logsunit = 0;
  63                 error = ioctl(file->fd, XFS_IOC_FSGEOMETRY_V1, &geo);
  64                 if (error) {
  65                         fprintf(stderr, _(
  66                                 "%s: cannot determine geometry of filesystem"
  67                                 " mounted at %s: %s\n"),
  68                                 progname, file->name, strerror(errno));
  69                         exitcode = 1;
  70                         return 0;
  71                 }
  72         }
  73
  74         xfs_report_geom(&geo, file->fs_path.fs_name, file->fs_path.fs_log,
  75                         file->fs_path.fs_rt);
  76         return 0;
  77 }
  78
  79 static const struct cmdinfo info_cmd = {
  80         .name =         "info",
  81         .altname =      "i",
  82         .cfunc =        info_f,
  83         .argmin =       0,
  84         .argmax =       0,
  85         .canpush =      0,
  86         .args =         NULL,
  87         .flags =        CMD_FLAG_ONESHOT,
  88         .oneline =      N_("pretty-print superblock geometry info"),
  89         .help =         info_help,
  90 };
  91
  92 void
  93 info_init(void)
  94 {
  95         add_command(&info_cmd);
  96 }