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/* libguestfs - the guestfsd daemon
* Copyright (C) 2012 Red Hat Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <inttypes.h>
#include "guestfs_protocol.h"
#include "daemon.h"
#include "actions.h"
#include "optgroups.h"
#define MAX_ARGS 64
GUESTFSD_EXT_CMD(str_fstrim, fstrim);
int
optgroup_fstrim_available (void)
{
return prog_exists (str_fstrim);
}
/* Takes optional arguments, consult optargs_bitmask. */
int
do_fstrim (const char *path,
int64_t offset, int64_t length, int64_t minimumfreeextent)
{
const char *argv[MAX_ARGS];
size_t i = 0;
char offset_s[64], length_s[64], mfe_s[64];
CLEANUP_FREE char *buf = NULL;
CLEANUP_FREE char *out = NULL, *err = NULL;
int r;
/* Suggested by Paolo Bonzini to fix fstrim problem.
* https://lists.gnu.org/archive/html/qemu-devel/2014-03/msg02978.html
*/
sync_disks ();
ADD_ARG (argv, i, str_fstrim);
if ((optargs_bitmask & GUESTFS_FSTRIM_OFFSET_BITMASK)) {
if (offset < 0) {
reply_with_error ("offset < 0");
return -1;
}
snprintf (offset_s, sizeof offset_s, "%" PRIi64, offset);
ADD_ARG (argv, i, "-o");
ADD_ARG (argv, i, offset_s);
}
if ((optargs_bitmask & GUESTFS_FSTRIM_LENGTH_BITMASK)) {
if (length <= 0) {
reply_with_error ("length <= 0");
return -1;
}
snprintf (length_s, sizeof length_s, "%" PRIi64, length);
ADD_ARG (argv, i, "-l");
ADD_ARG (argv, i, length_s);
}
if ((optargs_bitmask & GUESTFS_FSTRIM_MINIMUMFREEEXTENT_BITMASK)) {
if (minimumfreeextent <= 0) {
reply_with_error ("minimumfreeextent <= 0");
return -1;
}
snprintf (mfe_s, sizeof mfe_s, "%" PRIi64, minimumfreeextent);
ADD_ARG (argv, i, "-m");
ADD_ARG (argv, i, mfe_s);
}
/* When running in debug mode, use -v, capture stdout and print it below. */
if (verbose)
ADD_ARG (argv, i, "-v");
buf = sysroot_path (path);
if (!buf) {
reply_with_error ("malloc");
return -1;
}
ADD_ARG (argv, i, buf);
ADD_ARG (argv, i, NULL);
r = commandv (&out, &err, argv);
if (r == -1) {
/* If the error is about the kernel operation not being supported
* for this filesystem type, then return errno ENOTSUP here.
*/
if (strstr (err, "discard operation is not supported"))
reply_with_error_errno (ENOTSUP, "%s", err);
else
reply_with_error ("%s", err);
return -1;
}
if (verbose)
fprintf (stderr, "%s\n", out);
return 0;
}
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