spaceman/info.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2018 Oracle.  All Rights Reserved.
   4  * Author: Darrick J. Wong <darrick.wong@oracle.com>
   5  */
   6 #include "libxfs.h"
   7 #include "command.h"
   8 #include "init.h"
   9 #include "path.h"
  10 #include "space.h"
  11 #include "fsgeom.h"
  12
  13 static void
  14 info_help(void)
  15 {
  16         printf(_(
  17 "\n"
  18 " Pretty-prints the filesystem geometry as derived from the superblock.\n"
  19 " The output has the same format as mkfs.xfs, xfs_info, and other utilities.\n"
  20 " The opened file must be an XFS mount point.\n"
  21 "\n"
  22 ));
  23
  24 }
  25
  26 static int
  27 info_f(
  28         int                     argc,
  29         char                    **argv)
  30 {
  31         struct xfs_fsop_geom    geo;
  32         int                     error;
  33
  34         if (fs_table_lookup_mount(file->name) == NULL) {
  35                 fprintf(stderr, _("%s: Not a XFS mount point.\n"), file->name);
  36                 return 1;
  37         }
  38
  39         /* get the current filesystem size & geometry */
  40         error = ioctl(file->fd, XFS_IOC_FSGEOMETRY, &geo);
  41         if (error) {
  42                 /*
  43                  * OK, new xfsctl barfed - back off and try earlier version
  44                  * as we're probably running an older kernel version.
  45                  * Only field added in the v2 geometry xfsctl is "logsunit"
  46                  * so we'll zero that out for later display (as zero).
  47                  */
  48                 geo.logsunit = 0;
  49                 error = ioctl(file->fd, XFS_IOC_FSGEOMETRY_V1, &geo);
  50                 if (error) {
  51                         fprintf(stderr, _(
  52                                 "%s: cannot determine geometry of filesystem"
  53                                 " mounted at %s: %s\n"),
  54                                 progname, file->name, strerror(errno));
  55                         exitcode = 1;
  56                         return 0;
  57                 }
  58         }
  59
  60         xfs_report_geom(&geo, file->fs_path.fs_name, file->fs_path.fs_log,
  61                         file->fs_path.fs_rt);
  62         return 0;
  63 }
  64
  65 static const struct cmdinfo info_cmd = {
  66         .name =         "info",
  67         .altname =      "i",
  68         .cfunc =        info_f,
  69         .argmin =       0,
  70         .argmax =       0,
  71         .canpush =      0,
  72         .args =         NULL,
  73         .flags =        CMD_FLAG_ONESHOT,
  74         .oneline =      N_("pretty-print superblock geometry info"),
  75         .help =         info_help,
  76 };
  77
  78 void
  79 info_init(void)
  80 {
  81         add_command(&info_cmd);
  82 }