io/swapext.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2018 Red Hat, Inc.
   4  * All Rights Reserved.
   5  */
   6
   7 #include "command.h"
   8 #include "input.h"
   9 #include "init.h"
  10 #include "io.h"
  11 #include "libfrog/logging.h"
  12 #include "libfrog/fsgeom.h"
  13 #include "libfrog/bulkstat.h"
  14
  15 static cmdinfo_t swapext_cmd;
  16
  17 static void
  18 swapext_help(void)
  19 {
  20         printf(_(
  21 "\n"
  22 " Swaps extents between the open file descriptor and the supplied filename.\n"
  23 "\n"));
  24 }
  25
  26 static int
  27 swapext_f(
  28         int                     argc,
  29         char                    **argv)
  30 {
  31         struct xfs_fd           fxfd = XFS_FD_INIT(file->fd);
  32         struct xfs_bulkstat     bulkstat;
  33         int                     fd;
  34         int                     error;
  35         struct xfs_swapext      sx;
  36         struct stat             stat;
  37
  38         /* open the donor file */
  39         fd = openfile(argv[1], NULL, 0, 0, NULL);
  40         if (fd < 0)
  41                 return 0;
  42
  43         /*
  44          * stat the target file to get the inode number and use the latter to
  45          * get the bulkstat info for the swapext cmd.
  46          */
  47         error = fstat(file->fd, &stat);
  48         if (error) {
  49                 perror("fstat");
  50                 goto out;
  51         }
  52
  53         error = xfrog_bulkstat_single(&fxfd, stat.st_ino, 0, &bulkstat);
  54         if (error) {
  55                 xfrog_perror(error, "bulkstat");
  56                 goto out;
  57         }
  58         error = xfrog_bulkstat_v5_to_v1(&fxfd, &sx.sx_stat, &bulkstat);
  59         if (error) {
  60                 xfrog_perror(error, "bulkstat conversion");
  61                 goto out;
  62         }
  63         sx.sx_version = XFS_SX_VERSION;
  64         sx.sx_fdtarget = file->fd;
  65         sx.sx_fdtmp = fd;
  66         sx.sx_offset = 0;
  67         sx.sx_length = stat.st_size;
  68         error = ioctl(file->fd, XFS_IOC_SWAPEXT, &sx);
  69         if (error)
  70                 perror("swapext");
  71
  72 out:
  73         close(fd);
  74         return 0;
  75 }
  76
  77 void
  78 swapext_init(void)
  79 {
  80         swapext_cmd.name = "swapext";
  81         swapext_cmd.cfunc = swapext_f;
  82         swapext_cmd.argmin = 1;
  83         swapext_cmd.argmax = 1;
  84         swapext_cmd.flags = CMD_NOMAP_OK;
  85         swapext_cmd.args = _("<donorfile>");
  86         swapext_cmd.oneline = _("Swap extents between files.");
  87         swapext_cmd.help = swapext_help;
  88
  89         add_command(&swapext_cmd);
  90 }