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3f4ba2e98d21746723d291939ccc2e1f1526aa6d
libguestfs/daemon/btrfs.c
Pino Toscano 3f4ba2e98d btrfs: use calloc instead of malloc+memset 
Small optimization, and eases the code.
2015-06-16 17:31:43 +02:00

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/* libguestfs - the guestfsd daemon
* Copyright (C) 2011-2012 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 <inttypes.h>
#include <pcre.h>
#include <string.h>
#include <unistd.h>
#include <assert.h>
#include "daemon.h"
#include "actions.h"
#include "optgroups.h"
#include "xstrtol.h"
#include "c-ctype.h"
GUESTFSD_EXT_CMD(str_btrfs, btrfs);
GUESTFSD_EXT_CMD(str_btrfstune, btrfstune);
GUESTFSD_EXT_CMD(str_btrfsck, btrfsck);
GUESTFSD_EXT_CMD(str_mkfs_btrfs, mkfs.btrfs);
GUESTFSD_EXT_CMD(str_umount, umount);
GUESTFSD_EXT_CMD(str_btrfsimage, btrfs-image);
int
optgroup_btrfs_available (void)
{
return prog_exists (str_btrfs) && filesystem_available ("btrfs") > 0;
}
char *
btrfs_get_label (const char *device)
{
int r;
CLEANUP_FREE char *err = NULL;
char *out = NULL;
size_t len;
r = command (&out, &err, str_btrfs, "filesystem", "label",
device, NULL);
if (r == -1) {
reply_with_error ("%s", err);
free (out);
return NULL;
}
/* Trim trailing \n if present. */
len = strlen (out);
if (len > 0 && out[len-1] == '\n')
out[len-1] = '\0';
return out;
}
/* Takes optional arguments, consult optargs_bitmask. */
int
do_btrfs_filesystem_resize (const char *filesystem, int64_t size)
{
const size_t MAX_ARGS = 64;
CLEANUP_FREE char *buf = NULL, *err = NULL;
int r;
const char *argv[MAX_ARGS];
size_t i = 0;
char size_str[32];
ADD_ARG (argv, i, str_btrfs);
ADD_ARG (argv, i, "filesystem");
ADD_ARG (argv, i, "resize");
if (optargs_bitmask & GUESTFS_BTRFS_FILESYSTEM_RESIZE_SIZE_BITMASK) {
if (size <= 0) {
reply_with_error ("size is zero or negative");
return -1;
}
snprintf (size_str, sizeof size_str, "%" PRIi64, size);
ADD_ARG (argv, i, size_str);
}
else
ADD_ARG (argv, i, "max");
buf = sysroot_path (filesystem);
if (!buf) {
reply_with_error ("malloc");
return -1;
}
ADD_ARG (argv, i, buf);
ADD_ARG (argv, i, NULL);
r = commandv (NULL, &err, argv);
if (r == -1) {
reply_with_error ("%s: %s", filesystem, err);
return -1;
}
return 0;
}
/* Takes optional arguments, consult optargs_bitmask. */
int
do_mkfs_btrfs (char *const *devices,
int64_t allocstart, int64_t bytecount, const char *datatype,
int leafsize, const char *label, const char *metadata,
int nodesize, int sectorsize)
{
size_t nr_devices = count_strings (devices);
size_t MAX_ARGS = nr_devices + 64;
const char *argv[MAX_ARGS];
size_t i = 0, j;
int r;
CLEANUP_FREE char *err = NULL;
char allocstart_s[64];
char bytecount_s[64];
char leafsize_s[64];
char nodesize_s[64];
char sectorsize_s[64];
if (nr_devices == 0) {
reply_with_error ("list of devices must be non-empty");
return -1;
}
ADD_ARG (argv, i, str_mkfs_btrfs);
/* Optional arguments. */
if (optargs_bitmask & GUESTFS_MKFS_BTRFS_ALLOCSTART_BITMASK) {
if (allocstart < 0) {
reply_with_error ("allocstart must be >= 0");
return -1;
}
snprintf (allocstart_s, sizeof allocstart_s, "%" PRIi64, allocstart);
ADD_ARG (argv, i, "--alloc-start");
ADD_ARG (argv, i, allocstart_s);
}
if (optargs_bitmask & GUESTFS_MKFS_BTRFS_BYTECOUNT_BITMASK) {
if (bytecount <= 0) { /* actually the minimum is 256MB */
reply_with_error ("bytecount must be > 0");
return -1;
}
snprintf (bytecount_s, sizeof bytecount_s, "%" PRIi64, bytecount);
ADD_ARG (argv, i, "--byte-count");
ADD_ARG (argv, i, bytecount_s);
}
if (optargs_bitmask & GUESTFS_MKFS_BTRFS_DATATYPE_BITMASK) {
if (STRNEQ (datatype, "raid0") && STRNEQ (datatype, "raid1") &&
STRNEQ (datatype, "raid10") && STRNEQ (datatype, "single")) {
reply_with_error ("datatype not one of the allowed values");
return -1;
}
ADD_ARG (argv, i, "--data");
ADD_ARG (argv, i, datatype);
}
if (optargs_bitmask & GUESTFS_MKFS_BTRFS_LEAFSIZE_BITMASK) {
if (!is_power_of_2 (leafsize) || leafsize <= 0) {
reply_with_error ("leafsize must be > 0 and a power of two");
return -1;
}
snprintf (leafsize_s, sizeof leafsize_s, "%d", leafsize);
ADD_ARG (argv, i, "--leafsize");
ADD_ARG (argv, i, leafsize_s);
}
if (optargs_bitmask & GUESTFS_MKFS_BTRFS_LABEL_BITMASK) {
ADD_ARG (argv, i, "--label");
ADD_ARG (argv, i, label);
}
if (optargs_bitmask & GUESTFS_MKFS_BTRFS_METADATA_BITMASK) {
if (STRNEQ (metadata, "raid0") && STRNEQ (metadata, "raid1") &&
STRNEQ (metadata, "raid10") && STRNEQ (metadata, "single")) {
reply_with_error ("metadata not one of the allowed values");
return -1;
}
ADD_ARG (argv, i, "--metadata");
ADD_ARG (argv, i, metadata);
}
if (optargs_bitmask & GUESTFS_MKFS_BTRFS_NODESIZE_BITMASK) {
if (!is_power_of_2 (nodesize) || nodesize <= 0) {
reply_with_error ("nodesize must be > 0 and a power of two");
return -1;
}
snprintf (nodesize_s, sizeof nodesize_s, "%d", nodesize);
ADD_ARG (argv, i, "--nodesize");
ADD_ARG (argv, i, nodesize_s);
}
if (optargs_bitmask & GUESTFS_MKFS_BTRFS_SECTORSIZE_BITMASK) {
if (!is_power_of_2 (sectorsize) || sectorsize <= 0) {
reply_with_error ("sectorsize must be > 0 and a power of two");
return -1;
}
snprintf (sectorsize_s, sizeof sectorsize_s, "%d", sectorsize);
ADD_ARG (argv, i, "--sectorsize");
ADD_ARG (argv, i, sectorsize_s);
}
for (j = 0; j < nr_devices; ++j)
ADD_ARG (argv, i, devices[j]);
ADD_ARG (argv, i, NULL);
for (j = 0; j < nr_devices; ++j)
wipe_device_before_mkfs (devices[j]);
r = commandv (NULL, &err, argv);
if (r == -1) {
reply_with_error ("%s: %s", devices[0], err);
return -1;
}
return 0;
}
int
do_btrfs_subvolume_snapshot (const char *source, const char *dest, int ro,
const char *qgroupid)
{
const size_t MAX_ARGS = 64;
const char *argv[MAX_ARGS];
size_t i = 0;
CLEANUP_FREE char *source_buf = NULL, *dest_buf = NULL;
CLEANUP_FREE char *err = NULL;
int r;
source_buf = sysroot_path (source);
if (source_buf == NULL) {
reply_with_perror ("malloc");
return -1;
}
dest_buf = sysroot_path (dest);
if (dest_buf == NULL) {
reply_with_perror ("malloc");
return -1;
}
ADD_ARG (argv, i, str_btrfs);
ADD_ARG (argv, i, "subvolume");
ADD_ARG (argv, i, "snapshot");
/* Optional arguments. */
if ((optargs_bitmask & GUESTFS_BTRFS_SUBVOLUME_SNAPSHOT_RO_BITMASK) &&
ro)
ADD_ARG (argv, i, "-r");
if (optargs_bitmask & GUESTFS_BTRFS_SUBVOLUME_SNAPSHOT_QGROUPID_BITMASK) {
ADD_ARG (argv, i, "-i");
ADD_ARG (argv, i, qgroupid);
}
ADD_ARG (argv, i, source_buf);
ADD_ARG (argv, i, dest_buf);
ADD_ARG (argv, i, NULL);
r = commandv (NULL, &err, argv);
if (r == -1) {
reply_with_error ("%s: %s: %s", source, dest, err);
return -1;
}
return 0;
}
int
do_btrfs_subvolume_delete (const char *subvolume)
{
const size_t MAX_ARGS = 64;
const char *argv[MAX_ARGS];
size_t i = 0;
CLEANUP_FREE char *subvolume_buf = NULL;
CLEANUP_FREE char *err = NULL;
int r;
subvolume_buf = sysroot_path (subvolume);
if (subvolume_buf == NULL) {
reply_with_perror ("malloc");
return -1;
}
ADD_ARG (argv, i, str_btrfs);
ADD_ARG (argv, i, "subvolume");
ADD_ARG (argv, i, "delete");
ADD_ARG (argv, i, subvolume_buf);
ADD_ARG (argv, i, NULL);
r = commandv (NULL, &err, argv);
if (r == -1) {
reply_with_error ("%s: %s", subvolume, err);
return -1;
}
return 0;
}
int
do_btrfs_subvolume_create (const char *dest, const char *qgroupid)
{
const size_t MAX_ARGS = 64;
const char *argv[MAX_ARGS];
size_t i = 0;
CLEANUP_FREE char *dest_buf = NULL;
CLEANUP_FREE char *err = NULL;
int r;
dest_buf = sysroot_path (dest);
if (dest_buf == NULL) {
reply_with_perror ("malloc");
return -1;
}
ADD_ARG (argv, i, str_btrfs);
ADD_ARG (argv, i, "subvolume");
ADD_ARG (argv, i, "create");
/* Optional arguments. */
if (optargs_bitmask & GUESTFS_BTRFS_SUBVOLUME_CREATE_QGROUPID_BITMASK) {
ADD_ARG (argv, i, "-i");
ADD_ARG (argv, i, qgroupid);
}
ADD_ARG (argv, i, dest_buf);
ADD_ARG (argv, i, NULL);
r = commandv (NULL, &err, argv);
if (r == -1) {
reply_with_error ("%s: %s", dest, err);
return -1;
}
return 0;
}
static char *
mount (const mountable_t *fs)
{
char *fs_buf;
if (fs->type == MOUNTABLE_PATH) {
fs_buf = sysroot_path (fs->device);
if (fs_buf == NULL)
reply_with_perror ("malloc");
} else {
fs_buf = strdup ("/tmp/btrfs.XXXXXX");
if (fs_buf == NULL) {
reply_with_perror ("strdup");
return NULL;
}
if (mkdtemp (fs_buf) == NULL) {
reply_with_perror ("mkdtemp");
free (fs_buf);
return NULL;
}
if (mount_vfs_nochroot ("", NULL, fs, fs_buf, "<internal>") == -1) {
if (rmdir (fs_buf) == -1 && errno != ENOENT)
perror ("rmdir");
free (fs_buf);
return NULL;
}
}
return fs_buf;
}
static int
umount (char *fs_buf, const mountable_t *fs)
{
if (fs->type != MOUNTABLE_PATH) {
CLEANUP_FREE char *err = NULL;
if (command (NULL, &err, str_umount, fs_buf, NULL) == -1) {
reply_with_error ("umount: %s", err);
return -1;
}
if (rmdir (fs_buf) == -1 && errno != ENOENT) {
reply_with_perror ("rmdir");
return -1;
}
}
free (fs_buf);
return 0;
}
guestfs_int_btrfssubvolume_list *
do_btrfs_subvolume_list (const mountable_t *fs)
{
char **lines;
size_t i = 0;
const size_t MAX_ARGS = 64;
const char *argv[MAX_ARGS];
/* Execute 'btrfs subvolume list <fs>', and split the output into lines */
{
char *fs_buf = mount (fs);
if (!fs_buf)
return NULL;
ADD_ARG (argv, i, str_btrfs);
ADD_ARG (argv, i, "subvolume");
ADD_ARG (argv, i, "list");
ADD_ARG (argv, i, fs_buf);
ADD_ARG (argv, i, NULL);
CLEANUP_FREE char *out = NULL, *errout = NULL;
int r = commandv (&out, &errout, argv);
if (umount (fs_buf, fs) != 0)
return NULL;
if (r == -1) {
CLEANUP_FREE char *fs_desc = mountable_to_string (fs);
if (fs_desc == NULL) {
fprintf (stderr, "malloc: %m");
}
reply_with_error ("%s: %s", fs_desc ? fs_desc : "malloc", errout);
return NULL;
}
lines = split_lines (out);
if (!lines) return NULL;
}
/* Output is:
*
* ID 256 gen 30 top level 5 path test1
* ID 257 gen 30 top level 5 path dir/test2
* ID 258 gen 30 top level 5 path test3
*
* "ID <n>" is the subvolume ID.
* "gen <n>" is the generation when the root was created or last
* updated.
* "top level <n>" is the top level subvolume ID.
* "path <str>" is the subvolume path, relative to the top of the
* filesystem.
*
* Note that the order that each of the above is fixed, but
* different versions of btrfs may display different sets of data.
* Specifically, older versions of btrfs do not display gen.
*/
guestfs_int_btrfssubvolume_list *ret = NULL;
pcre *re = NULL;
size_t nr_subvolumes = count_strings (lines);
ret = malloc (sizeof *ret);
if (!ret) {
reply_with_perror ("malloc");
goto error;
}
ret->guestfs_int_btrfssubvolume_list_len = nr_subvolumes;
ret->guestfs_int_btrfssubvolume_list_val =
calloc (nr_subvolumes, sizeof (struct guestfs_int_btrfssubvolume));
if (ret->guestfs_int_btrfssubvolume_list_val == NULL) {
reply_with_perror ("malloc");
goto error;
}
const char *errptr;
int erroffset;
re = pcre_compile ("ID\\s+(\\d+).*\\s"
"top level\\s+(\\d+).*\\s"
"path\\s(.*)",
0, &errptr, &erroffset, NULL);
if (re == NULL) {
reply_with_error ("pcre_compile (%i): %s", erroffset, errptr);
goto error;
}
for (size_t i = 0; i < nr_subvolumes; ++i) {
/* To avoid allocations, reuse the 'line' buffer to store the
* path. Thus we don't need to free 'line', since it will be
* freed by the calling (XDR) code.
*/
char *line = lines[i];
#define N_MATCHES 4
int ovector[N_MATCHES * 3];
if (pcre_exec (re, NULL, line, strlen (line), 0, 0,
ovector, N_MATCHES * 3) < 0)
#undef N_MATCHES
{
unexpected_output:
reply_with_error ("unexpected output from 'btrfs subvolume list' command: %s", line);
goto error;
}
struct guestfs_int_btrfssubvolume *this =
&ret->guestfs_int_btrfssubvolume_list_val[i];
#if __WORDSIZE == 64
#define XSTRTOU64 xstrtoul
#else
#define XSTRTOU64 xstrtoull
#endif
if (XSTRTOU64 (line + ovector[2], NULL, 10,
&this->btrfssubvolume_id, NULL) != LONGINT_OK)
goto unexpected_output;
if (XSTRTOU64 (line + ovector[4], NULL, 10,
&this->btrfssubvolume_top_level_id, NULL) != LONGINT_OK)
goto unexpected_output;
#undef XSTRTOU64
memmove (line, line + ovector[6], ovector[7] - ovector[6] + 1);
this->btrfssubvolume_path = line;
}
free (lines);
pcre_free (re);
return ret;
error:
free_stringslen (lines, nr_subvolumes);
if (ret) free (ret->guestfs_int_btrfssubvolume_list_val);
free (ret);
if (re) pcre_free (re);
return NULL;
}
int
do_btrfs_subvolume_set_default (int64_t id, const char *fs)
{
const size_t MAX_ARGS = 64;
const char *argv[MAX_ARGS];
size_t i = 0;
CLEANUP_FREE char *fs_buf = NULL;
char buf[64];
CLEANUP_FREE char *err = NULL;
int r;
snprintf (buf, sizeof buf, "%" PRIi64, id);
fs_buf = sysroot_path (fs);
if (fs_buf == NULL) {
reply_with_perror ("malloc");
return -1;
}
ADD_ARG (argv, i, str_btrfs);
ADD_ARG (argv, i, "subvolume");
ADD_ARG (argv, i, "set-default");
ADD_ARG (argv, i, buf);
ADD_ARG (argv, i, fs_buf);
ADD_ARG (argv, i, NULL);
r = commandv (NULL, &err, argv);
if (r == -1) {
reply_with_error ("%s: %s", fs, err);
return -1;
}
return 0;
}
int64_t
do_btrfs_subvolume_get_default (const mountable_t *fs)
{
const size_t MAX_ARGS = 64;
const char *argv[MAX_ARGS];
size_t i = 0;
char *fs_buf = NULL;
CLEANUP_FREE char *err = NULL;
CLEANUP_FREE char *out = NULL;
int r;
int64_t ret = -1;
fs_buf = mount (fs);
if (fs_buf == NULL)
goto error;
ADD_ARG (argv, i, str_btrfs);
ADD_ARG (argv, i, "subvolume");
ADD_ARG (argv, i, "get-default");
ADD_ARG (argv, i, fs_buf);
ADD_ARG (argv, i, NULL);
r = commandv (&out, &err, argv);
if (r == -1) {
reply_with_error ("%s: %s", fs_buf, err);
goto error;
}
if (sscanf (out, "ID %" SCNi64, &ret) != 1) {
reply_with_error ("%s: could not parse subvolume id: %s", argv[0], out);
ret = -1;
goto error;
}
error:
if (fs_buf && umount (fs_buf, fs) != 0)
return -1;
return ret;
}
int
do_btrfs_filesystem_sync (const char *fs)
{
const size_t MAX_ARGS = 64;
const char *argv[MAX_ARGS];
size_t i = 0;
CLEANUP_FREE char *fs_buf = NULL;
CLEANUP_FREE char *err = NULL;
int r;
fs_buf = sysroot_path (fs);
if (fs_buf == NULL) {
reply_with_perror ("malloc");
return -1;
}
ADD_ARG (argv, i, str_btrfs);
ADD_ARG (argv, i, "filesystem");
ADD_ARG (argv, i, "sync");
ADD_ARG (argv, i, fs_buf);
ADD_ARG (argv, i, NULL);
r = commandv (NULL, &err, argv);
if (r == -1) {
reply_with_error ("%s: %s", fs, err);
return -1;
}
return 0;
}
int
do_btrfs_filesystem_balance (const char *fs)
{
const size_t MAX_ARGS = 64;
const char *argv[MAX_ARGS];
size_t i = 0;
CLEANUP_FREE char *fs_buf = NULL;
CLEANUP_FREE char *err = NULL;
int r;
fs_buf = sysroot_path (fs);
if (fs_buf == NULL) {
reply_with_perror ("malloc");
return -1;
}
ADD_ARG (argv, i, str_btrfs);
ADD_ARG (argv, i, "balance");
ADD_ARG (argv, i, fs_buf);
ADD_ARG (argv, i, NULL);
r = commandv (NULL, &err, argv);
if (r == -1) {
reply_with_error ("%s: %s", fs, err);
return -1;
}
return 0;
}
/* Test if 'btrfs device add' needs the --force option (added
* c.2013-09) in order to work.
*/
static int
test_btrfs_device_add_needs_force (void)
{
int r;
CLEANUP_FREE char *out = NULL, *err = NULL;
r = command (&out, &err, str_btrfs, "device", "add", "--help", NULL);
if (r == -1) {
reply_with_error ("%s: %s", "btrfs device add --help", err);
return -1;
}
return strstr (out, "--force") != NULL;
}
int
do_btrfs_device_add (char *const *devices, const char *fs)
{
static int btrfs_device_add_needs_force = -1;
size_t nr_devices = count_strings (devices);
size_t MAX_ARGS = nr_devices + 8;
const char *argv[MAX_ARGS];
size_t i = 0, j;
CLEANUP_FREE char *fs_buf = NULL;
CLEANUP_FREE char *err = NULL;
int r;
if (nr_devices == 0)
return 0;
if (btrfs_device_add_needs_force == -1) {
btrfs_device_add_needs_force = test_btrfs_device_add_needs_force ();
if (btrfs_device_add_needs_force == -1)
return -1;
}
fs_buf = sysroot_path (fs);
if (fs_buf == NULL) {
reply_with_perror ("malloc");
return -1;
}
ADD_ARG (argv, i, str_btrfs);
ADD_ARG (argv, i, "device");
ADD_ARG (argv, i, "add");
if (btrfs_device_add_needs_force)
ADD_ARG (argv, i, "--force");
for (j = 0; j < nr_devices; ++j)
ADD_ARG (argv, i, devices[j]);
ADD_ARG (argv, i, fs_buf);
ADD_ARG (argv, i, NULL);
r = commandv (NULL, &err, argv);
if (r == -1) {
reply_with_error ("%s: %s", fs, err);
return -1;
}
return 0;
}
int
do_btrfs_device_delete (char *const *devices, const char *fs)
{
size_t nr_devices = count_strings (devices);
if (nr_devices == 0)
return 0;
size_t MAX_ARGS = nr_devices + 8;
const char *argv[MAX_ARGS];
size_t i = 0, j;
CLEANUP_FREE char *fs_buf = NULL;
CLEANUP_FREE char *err = NULL;
int r;
fs_buf = sysroot_path (fs);
if (fs_buf == NULL) {
reply_with_perror ("malloc");
return -1;
}
ADD_ARG (argv, i, str_btrfs);
ADD_ARG (argv, i, "device");
ADD_ARG (argv, i, "delete");
for (j = 0; j < nr_devices; ++j)
ADD_ARG (argv, i, devices[j]);
ADD_ARG (argv, i, fs_buf);
ADD_ARG (argv, i, NULL);
r = commandv (NULL, &err, argv);
if (r == -1) {
reply_with_error ("%s: %s", fs, err);
return -1;
}
return 0;
}
int
do_btrfs_set_seeding (const char *device, int svalue)
{
CLEANUP_FREE char *err = NULL;
int r;
const char *s_value = svalue ? "1" : "0";
r = commandr (NULL, &err, str_btrfstune, "-S", s_value, device, NULL);
if (r == -1) {
reply_with_error ("%s: %s", device, err);
return -1;
}
return 0;
}
/* Takes optional arguments, consult optargs_bitmask. */
int
do_btrfs_fsck (const char *device, int64_t superblock, int repair)
{
CLEANUP_FREE char *err = NULL;
int r;
size_t i = 0;
const size_t MAX_ARGS = 64;
const char *argv[MAX_ARGS];
char super_s[64];
ADD_ARG (argv, i, str_btrfsck);
/* Optional arguments. */
if (optargs_bitmask & GUESTFS_BTRFS_FSCK_SUPERBLOCK_BITMASK) {
if (superblock < 0) {
reply_with_error ("super block offset must be >= 0");
return -1;
}
snprintf (super_s, sizeof super_s, "%" PRIi64, superblock);
ADD_ARG (argv, i, "--super");
ADD_ARG (argv, i, super_s);
}
if (!(optargs_bitmask & GUESTFS_BTRFS_FSCK_REPAIR_BITMASK))
repair = 0;
if (repair)
ADD_ARG (argv, i, "--repair");
ADD_ARG (argv, i, device);
ADD_ARG (argv, i, NULL);
r = commandv (NULL, &err, argv);
if (r == -1) {
reply_with_error ("%s: %s", device, err);
return -1;
}
return 0;
}
/* analyze_line: analyze one line contains key:value pair.
* returns the next position following \n.
*/
static char *
analyze_line (char *line, char **key, char **value)
{
char *p = line;
char *next = NULL;
char delimiter = ':';
char *del_pos = NULL;
if (!line || *line == '\0') {
*key = NULL;
*value = NULL;
return NULL;
}
next = strchr (p, '\n');
if (next) {
*next = '\0';
++next;
}
/* leading spaces and tabs */
while (*p && c_isspace (*p))
++p;
assert (key);
if (*p == delimiter)
*key = NULL;
else
*key = p;
del_pos = strchr (p, delimiter);
if (del_pos) {
*del_pos = '\0';
/* leading spaces and tabs */
do {
++del_pos;
} while (*del_pos && c_isspace (*del_pos));
assert (value);
*value = del_pos;
} else
*value = NULL;
return next;
}
char **
do_btrfs_subvolume_show (const char *subvolume)
{
const size_t MAX_ARGS = 64;
const char *argv[MAX_ARGS];
size_t i = 0;
CLEANUP_FREE char *subvolume_buf = NULL;
CLEANUP_FREE char *err = NULL;
CLEANUP_FREE char *out = NULL;
char *p, *key = NULL, *value = NULL;
DECLARE_STRINGSBUF (ret);
int r;
subvolume_buf = sysroot_path (subvolume);
if (subvolume_buf == NULL) {
reply_with_perror ("malloc");
return NULL;
}
ADD_ARG (argv, i, str_btrfs);
ADD_ARG (argv, i, "subvolume");
ADD_ARG (argv, i, "show");
ADD_ARG (argv, i, subvolume_buf);
ADD_ARG (argv, i, NULL);
r = commandv (&out, &err, argv);
if (r == -1) {
reply_with_error ("%s: %s", subvolume, err);
return NULL;
}
/* If the path is the btrfs root, `btrfs subvolume show' reports:
* <path> is btrfs root
*/
if (out && strstr (out, "is btrfs root") != NULL) {
reply_with_error ("%s is btrfs root", subvolume);
return NULL;
}
/* If the path is a normal directory, `btrfs subvolume show' reports:
* ERROR: <path> is not a subvolume
*/
if (err && strstr (err, "is not a subvolume")) {
reply_with_error ("%s is not a subvolume", subvolume);
return NULL;
}
/* Output is:
*
* /
* Name: root
* uuid: c875169e-cf4e-a04d-9959-b667dec36234
* Parent uuid: -
* Creation time: 2014-11-13 10:13:08
* Object ID: 256
* Generation (Gen): 6579
* Gen at creation: 5
* Parent: 5
* Top Level: 5
* Flags: -
* Snapshot(s):
* snapshots/test1
* snapshots/test2
* snapshots/test3
*
*/
p = analyze_line(out, &key, &value);
if (!p) {
reply_with_error ("truncated output: %s", out);
return NULL;
}
/* The first line is the path of the subvolume. */
if (key && !value) {
if (add_string (&ret, "path") == -1)
return NULL;
if (add_string (&ret, key) == -1)
return NULL;
} else {
if (add_string (&ret, key) == -1)
return NULL;
if (add_string (&ret, value) == -1)
return NULL;
}
/* Read the lines and split into "key: value". */
p = analyze_line(p, &key, &value);
while (key) {
/* snapshot is special, see the output above */
if (STREQLEN (key, "Snapshot(s)", sizeof ("Snapshot(s)") - 1)) {
char *ss = NULL;
int ss_len = 0;
if (add_string (&ret, key) == -1)
return NULL;
p = analyze_line(p, &key, &value);
while (key && !value) {
ss = realloc (ss, ss_len + strlen (key) + 1);
if (!ss)
return NULL;
if (ss_len != 0)
ss[ss_len++] = ',';
memcpy (ss + ss_len, key, strlen (key));
ss_len += strlen (key);
ss[ss_len] = '\0';
p = analyze_line(p, &key, &value);
}
if (ss) {
if (add_string_nodup (&ret, ss) == -1) {
free (ss);
return NULL;
}
} else {
if (add_string (&ret, "") == -1)
return NULL;
}
} else {
if (add_string (&ret, key ? key : "") == -1)
return NULL;
if (value && !STREQ(value, "-")) {
if (add_string (&ret, value) == -1)
return NULL;
} else {
if (add_string (&ret, "") == -1)
return NULL;
}
p = analyze_line(p, &key, &value);
}
}
if (end_stringsbuf (&ret) == -1)
return NULL;
return ret.argv;
}
int
do_btrfs_quota_enable (const mountable_t *fs, int enable)
{
const size_t MAX_ARGS = 64;
const char *argv[MAX_ARGS];
size_t i = 0;
char *fs_buf = NULL;
CLEANUP_FREE char *err = NULL;
int r = -1;
fs_buf = mount (fs);
if (fs_buf == NULL)
goto error;
ADD_ARG (argv, i, str_btrfs);
ADD_ARG (argv, i, "quota");
if (enable)
ADD_ARG (argv, i, "enable");
else
ADD_ARG (argv, i, "disable");
ADD_ARG (argv, i, fs_buf);
ADD_ARG (argv, i, NULL);
r = commandv (NULL, &err, argv);
if (r == -1) {
reply_with_error ("%s: %s", fs_buf, err);
goto error;
}
error:
if (fs_buf && umount (fs_buf, fs) != 0)
return -1;
return r;
}
int
do_btrfs_quota_rescan (const mountable_t *fs)
{
const size_t MAX_ARGS = 64;
const char *argv[MAX_ARGS];
size_t i = 0;
char *fs_buf = NULL;
CLEANUP_FREE char *err = NULL;
int r = -1;
fs_buf = mount (fs);
if (fs_buf == NULL)
goto error;
ADD_ARG (argv, i, str_btrfs);
ADD_ARG (argv, i, "quota");
ADD_ARG (argv, i, "rescan");
ADD_ARG (argv, i, fs_buf);
ADD_ARG (argv, i, NULL);
r = commandv (NULL, &err, argv);
if (r == -1) {
reply_with_error ("%s: %s", fs_buf, err);
goto error;
}
error:
if (fs_buf && umount (fs_buf, fs) != 0)
return -1;
return r;
}
int
do_btrfs_qgroup_limit (const char *subvolume, int64_t size)
{
const size_t MAX_ARGS = 64;
const char *argv[MAX_ARGS];
size_t i = 0;
CLEANUP_FREE char *subvolume_buf = NULL;
CLEANUP_FREE char *err = NULL;
char size_str[32];
int r;
subvolume_buf = sysroot_path (subvolume);
if (subvolume_buf == NULL) {
reply_with_perror ("malloc");
return -1;
}
ADD_ARG (argv, i, str_btrfs);
ADD_ARG (argv, i, "qgroup");
ADD_ARG (argv, i, "limit");
snprintf (size_str, sizeof size_str, "%" PRIi64, size);
ADD_ARG (argv, i, size_str);
ADD_ARG (argv, i, subvolume_buf);
ADD_ARG (argv, i, NULL);
r = commandv (NULL, &err, argv);
if (r == -1) {
reply_with_error ("%s: %s", subvolume, err);
return -1;
}
return 0;
}
int
do_btrfs_qgroup_create (const char *qgroupid, const char *subvolume)
{
const size_t MAX_ARGS = 64;
const char *argv[MAX_ARGS];
size_t i = 0;
CLEANUP_FREE char *subvolume_buf = NULL;
CLEANUP_FREE char *err = NULL;
int r;
subvolume_buf = sysroot_path (subvolume);
if (subvolume_buf == NULL) {
reply_with_perror ("malloc");
return -1;
}
ADD_ARG (argv, i, str_btrfs);
ADD_ARG (argv, i, "qgroup");
ADD_ARG (argv, i, "create");
ADD_ARG (argv, i, qgroupid);
ADD_ARG (argv, i, subvolume_buf);
ADD_ARG (argv, i, NULL);
r = commandv (NULL, &err, argv);
if (r == -1) {
reply_with_error ("%s: %s", subvolume, err);
return -1;
}
return 0;
}
int
do_btrfs_qgroup_destroy (const char *qgroupid, const char *subvolume)
{
const size_t MAX_ARGS = 64;
const char *argv[MAX_ARGS];
size_t i = 0;
CLEANUP_FREE char *subvolume_buf = NULL;
CLEANUP_FREE char *err = NULL;
int r;
subvolume_buf = sysroot_path (subvolume);
if (subvolume_buf == NULL) {
reply_with_perror ("malloc");
return -1;
}
ADD_ARG (argv, i, str_btrfs);
ADD_ARG (argv, i, "qgroup");
ADD_ARG (argv, i, "destroy");
ADD_ARG (argv, i, qgroupid);
ADD_ARG (argv, i, subvolume_buf);
ADD_ARG (argv, i, NULL);
r = commandv (NULL, &err, argv);
if (r == -1) {
reply_with_error ("%s: %s", subvolume, err);
return -1;
}
return 0;
}
/* btrfs qgroup show command change default output to
* binary prefix since v3.18.2, such as KiB;
* also introduced '--raw' to keep traditional behaviour.
* We could check wheter 'btrfs qgroup show' support '--raw'
* option by checking the output of
* 'btrfs qgroup show' support --help' command.
*/
static int
test_btrfs_qgroup_show_raw_opt (void)
{
static int result = -1;
if (result != -1)
return result;
CLEANUP_FREE char *err = NULL;
CLEANUP_FREE char *out = NULL;
int r = commandr (&out, &err, str_btrfs, "qgroup", "show", "--help", NULL);
if (r == -1) {
reply_with_error ("btrfs qgroup show --help: %s", err);
return -1;
}
if (strstr (out, "--raw") == NULL)
result = 0;
else
result = 1;
return result;
}
guestfs_int_btrfsqgroup_list *
do_btrfs_qgroup_show (const char *path)
{
const size_t MAX_ARGS = 64;
const char *argv[MAX_ARGS];
size_t i = 0;
int has_raw_opt = test_btrfs_qgroup_show_raw_opt ();
CLEANUP_FREE char *path_buf = NULL;
CLEANUP_FREE char *err = NULL;
CLEANUP_FREE char *out = NULL;
int r;
char **lines;
path_buf = sysroot_path (path);
if (path_buf == NULL) {
reply_with_perror ("malloc");
return NULL;
}
ADD_ARG (argv, i, str_btrfs);
ADD_ARG (argv, i, "qgroup");
ADD_ARG (argv, i, "show");
if (has_raw_opt > 0)
ADD_ARG (argv, i, "--raw");
ADD_ARG (argv, i, path_buf);
ADD_ARG (argv, i, NULL);
r = commandv (&out, &err, argv);
if (r == -1) {
reply_with_error ("%s: %s", path, err);
return NULL;
}
lines = split_lines (out);
if (!lines)
return NULL;
/* line 0 and 1 are:
*
* qgroupid rfer excl
* -------- ---- ----
*/
size_t nr_qgroups = count_strings (lines) - 2;
guestfs_int_btrfsqgroup_list *ret = NULL;
ret = malloc (sizeof *ret);
if (!ret) {
reply_with_perror ("malloc");
goto error;
}
ret->guestfs_int_btrfsqgroup_list_len = nr_qgroups;
ret->guestfs_int_btrfsqgroup_list_val =
calloc (nr_qgroups, sizeof (struct guestfs_int_btrfsqgroup));
if (ret->guestfs_int_btrfsqgroup_list_val == NULL) {
reply_with_perror ("malloc");
goto error;
}
for (i = 0; i < nr_qgroups; ++i) {
char *line = lines[i + 2];
struct guestfs_int_btrfsqgroup *this =
&ret->guestfs_int_btrfsqgroup_list_val[i];
uint64_t dummy1, dummy2;
char *p;
if (sscanf (line, "%" SCNu64 "/%" SCNu64 " %" SCNu64 " %" SCNu64,
&dummy1, &dummy2, &this->btrfsqgroup_rfer,
&this->btrfsqgroup_excl) != 4) {
reply_with_error ("cannot parse output of qgroup show command: %s", line);
goto error;
}
p = strchr(line, ' ');
if (!p) {
reply_with_error ("truncated line: %s", line);
goto error;
}
*p = '\0';
this->btrfsqgroup_id = line;
}
free (lines);
return ret;
error:
free_stringslen (lines, nr_qgroups + 2);
if (ret)
free (ret->guestfs_int_btrfsqgroup_list_val);
free (ret);
return NULL;
}
int
do_btrfs_qgroup_assign (const char *src, const char *dst, const char *path)
{
const size_t MAX_ARGS = 64;
const char *argv[MAX_ARGS];
size_t i = 0;
CLEANUP_FREE char *path_buf = NULL;
CLEANUP_FREE char *err = NULL;
int r;
path_buf = sysroot_path (path);
if (path_buf == NULL) {
reply_with_perror ("malloc");
return -1;
}
ADD_ARG (argv, i, str_btrfs);
ADD_ARG (argv, i, "qgroup");
ADD_ARG (argv, i, "assign");
ADD_ARG (argv, i, src);
ADD_ARG (argv, i, dst);
ADD_ARG (argv, i, path_buf);
ADD_ARG (argv, i, NULL);
r = commandv (NULL, &err, argv);
if (r == -1) {
reply_with_error ("%s: %s", path, err);
return -1;
}
return 0;
}
int
do_btrfs_qgroup_remove (const char *src, const char *dst, const char *path)
{
const size_t MAX_ARGS = 64;
const char *argv[MAX_ARGS];
size_t i = 0;
CLEANUP_FREE char *path_buf = NULL;
CLEANUP_FREE char *err = NULL;
int r;
path_buf = sysroot_path (path);
if (path_buf == NULL) {
reply_with_perror ("malloc");
return -1;
}
ADD_ARG (argv, i, str_btrfs);
ADD_ARG (argv, i, "qgroup");
ADD_ARG (argv, i, "remove");
ADD_ARG (argv, i, src);
ADD_ARG (argv, i, dst);
ADD_ARG (argv, i, path_buf);
ADD_ARG (argv, i, NULL);
r = commandv (NULL, &err, argv);
if (r == -1) {
reply_with_error ("%s: %s", path, err);
return -1;
}
return 0;
}
int
do_btrfs_scrub_start (const char *path)
{
const size_t MAX_ARGS = 64;
const char *argv[MAX_ARGS];
size_t i = 0;
CLEANUP_FREE char *path_buf = NULL;
CLEANUP_FREE char *err = NULL;
int r;
path_buf = sysroot_path (path);
if (path_buf == NULL) {
reply_with_perror ("malloc");
return -1;
}
ADD_ARG (argv, i, str_btrfs);
ADD_ARG (argv, i, "scrub");
ADD_ARG (argv, i, "start");
ADD_ARG (argv, i, path_buf);
ADD_ARG (argv, i, NULL);
r = commandv (NULL, &err, argv);
if (r == -1) {
reply_with_error ("%s: %s", path, err);
return -1;
}
return 0;
}
int
do_btrfs_scrub_cancel (const char *path)
{
const size_t MAX_ARGS = 64;
const char *argv[MAX_ARGS];
size_t i = 0;
CLEANUP_FREE char *path_buf = NULL;
CLEANUP_FREE char *err = NULL;
int r;
path_buf = sysroot_path (path);
if (path_buf == NULL) {
reply_with_perror ("malloc");
return -1;
}
ADD_ARG (argv, i, str_btrfs);
ADD_ARG (argv, i, "scrub");
ADD_ARG (argv, i, "cancel");
ADD_ARG (argv, i, path_buf);
ADD_ARG (argv, i, NULL);
r = commandv (NULL, &err, argv);
if (r == -1) {
reply_with_error ("%s: %s", path, err);
return -1;
}
return 0;
}
int
do_btrfs_scrub_resume (const char *path)
{
const size_t MAX_ARGS = 64;
const char *argv[MAX_ARGS];
size_t i = 0;
CLEANUP_FREE char *path_buf = NULL;
CLEANUP_FREE char *err = NULL;
int r;
path_buf = sysroot_path (path);
if (path_buf == NULL) {
reply_with_perror ("malloc");
return -1;
}
ADD_ARG (argv, i, str_btrfs);
ADD_ARG (argv, i, "scrub");
ADD_ARG (argv, i, "resume");
ADD_ARG (argv, i, path_buf);
ADD_ARG (argv, i, NULL);
r = commandv (NULL, &err, argv);
if (r == -1) {
reply_with_error ("%s: %s", path, err);
return -1;
}
return 0;
}
int
do_btrfs_balance_pause (const char *path)
{
const size_t MAX_ARGS = 64;
const char *argv[MAX_ARGS];
size_t i = 0;
CLEANUP_FREE char *path_buf = NULL;
CLEANUP_FREE char *err = NULL;
int r;
path_buf = sysroot_path (path);
if (path_buf == NULL) {
reply_with_perror ("malloc");
return -1;
}
ADD_ARG (argv, i, str_btrfs);
ADD_ARG (argv, i, "balance");
ADD_ARG (argv, i, "pause");
ADD_ARG (argv, i, path_buf);
ADD_ARG (argv, i, NULL);
r = commandv (NULL, &err, argv);
if (r == -1) {
reply_with_error ("%s: %s", path, err);
return -1;
}
return 0;
}
int
do_btrfs_balance_cancel (const char *path)
{
const size_t MAX_ARGS = 64;
const char *argv[MAX_ARGS];
size_t i = 0;
CLEANUP_FREE char *path_buf = NULL;
CLEANUP_FREE char *err = NULL;
int r;
path_buf = sysroot_path (path);
if (path_buf == NULL) {
reply_with_perror ("malloc");
return -1;
}
ADD_ARG (argv, i, str_btrfs);
ADD_ARG (argv, i, "balance");
ADD_ARG (argv, i, "cancel");
ADD_ARG (argv, i, path_buf);
ADD_ARG (argv, i, NULL);
r = commandv (NULL, &err, argv);
if (r == -1) {
reply_with_error ("%s: %s", path, err);
return -1;
}
return 0;
}
int
do_btrfs_balance_resume (const char *path)
{
const size_t MAX_ARGS = 64;
const char *argv[MAX_ARGS];
size_t i = 0;
CLEANUP_FREE char *path_buf = NULL;
CLEANUP_FREE char *err = NULL;
int r;
path_buf = sysroot_path (path);
if (path_buf == NULL) {
reply_with_perror ("malloc");
return -1;
}
ADD_ARG (argv, i, str_btrfs);
ADD_ARG (argv, i, "balance");
ADD_ARG (argv, i, "resume");
ADD_ARG (argv, i, path_buf);
ADD_ARG (argv, i, NULL);
r = commandv (NULL, &err, argv);
if (r == -1) {
reply_with_error ("%s: %s", path, err);
return -1;
}
return 0;
}
/* Takes optional arguments, consult optargs_bitmask. */
int
do_btrfs_filesystem_defragment (const char *path, int flush, const char *compress)
{
const size_t MAX_ARGS = 64;
const char *argv[MAX_ARGS];
size_t i = 0;
CLEANUP_FREE char *path_buf = NULL;
CLEANUP_FREE char *err = NULL;
int r;
path_buf = sysroot_path (path);
if (path_buf == NULL) {
reply_with_perror ("malloc");
return -1;
}
ADD_ARG (argv, i, str_btrfs);
ADD_ARG (argv, i, "filesystem");
ADD_ARG (argv, i, "defragment");
ADD_ARG (argv, i, "-r");
/* Optional arguments. */
if ((optargs_bitmask & GUESTFS_BTRFS_FILESYSTEM_DEFRAGMENT_FLUSH_BITMASK) && flush)
ADD_ARG (argv, i, "-f");
if (optargs_bitmask & GUESTFS_BTRFS_FILESYSTEM_DEFRAGMENT_COMPRESS_BITMASK) {
if (STREQ(compress, "zlib"))
ADD_ARG (argv, i, "-czlib");
else if (STREQ(compress, "lzo"))
ADD_ARG (argv, i, "-clzo");
else {
reply_with_error ("unknown compress method: %s", compress);
return -1;
}
}
ADD_ARG (argv, i, path_buf);
ADD_ARG (argv, i, NULL);
r = commandv (NULL, &err, argv);
if (r == -1) {
reply_with_error ("%s: %s", path, err);
return -1;
}
return 0;
}
int
do_btrfs_rescue_chunk_recover (const char *device)
{
const size_t MAX_ARGS = 64;
const char *argv[MAX_ARGS];
size_t i = 0;
CLEANUP_FREE char *err = NULL;
int r;
ADD_ARG (argv, i, str_btrfs);
ADD_ARG (argv, i, "rescue");
ADD_ARG (argv, i, "chunk-recover");
ADD_ARG (argv, i, "-y");
ADD_ARG (argv, i, device);
ADD_ARG (argv, i, NULL);
r = commandv (NULL, &err, argv);
if (r == -1) {
reply_with_error ("%s: %s", device, err);
return -1;
}
return 0;
}
int
do_btrfs_rescue_super_recover (const char *device)
{
const size_t MAX_ARGS = 64;
const char *argv[MAX_ARGS];
size_t i = 0;
CLEANUP_FREE char *err = NULL;
int r;
ADD_ARG (argv, i, str_btrfs);
ADD_ARG (argv, i, "rescue");
ADD_ARG (argv, i, "super-recover");
ADD_ARG (argv, i, "-y");
ADD_ARG (argv, i, device);
ADD_ARG (argv, i, NULL);
r = commandv (NULL, &err, argv);
if (r == -1) {
reply_with_error ("%s: %s", device, err);
return -1;
}
return 0;
}
guestfs_int_btrfsbalance *
do_btrfs_balance_status (const char *path)
{
const size_t MAX_ARGS = 64;
const char *argv[MAX_ARGS];
size_t i = 0;
CLEANUP_FREE char *path_buf = NULL;
CLEANUP_FREE char *err = NULL;
char *out;
int r;
guestfs_int_btrfsbalance *ret;
char **lines;
size_t nlines;
const char *errptr;
int erroffset;
#define N_MATCH 2
int ovector[N_MATCH * 3];
pcre *re = NULL;
path_buf = sysroot_path (path);
if (path_buf == NULL) {
reply_with_perror ("malloc");
return NULL;
}
ADD_ARG (argv, i, str_btrfs);
ADD_ARG (argv, i, "balance");
ADD_ARG (argv, i, "status");
ADD_ARG (argv, i, path_buf);
ADD_ARG (argv, i, NULL);
r = commandv (&out, &err, argv);
if (r == -1) {
reply_with_error ("%s: %s", path, err);
return NULL;
}
lines = split_lines (out);
if (!lines)
return NULL;
nlines = count_strings (lines);
ret = calloc (1, sizeof *ret);
if (ret == NULL) {
reply_with_perror ("calloc");
goto error;
}
/* Output of `btrfs balance status' is like:
*
* running:
*
* Balance on '/' is running
* 3 out of about 8 chunks balanced (3 considered), 62% left
*
* paused:
*
* Balance on '/' is paused
* 3 out of about 8 chunks balanced (3 considered), 62% left
*
* no balance running:
*
* No Balance found on '/'
*
*/
if (nlines < 1) {
reply_with_perror ("No balance status output");
return NULL;
}
if (strstr (lines[0], "No balance found on")) {
ret->btrfsbalance_status = strdup("none");
if (ret->btrfsbalance_status == NULL) {
reply_with_perror ("strdup");
return NULL;
}
return ret;
}
re = pcre_compile ("Balance on '.*' is (.*)", 0, &errptr, &erroffset, NULL);
if (re == NULL) {
reply_with_error ("pcre_compile (%i): %s", erroffset, errptr);
goto error;
}
if (pcre_exec (re, NULL, lines[0], strlen (lines[0]), 0, 0,
ovector, N_MATCH * 3) < 0) {
reply_with_error ("unexpected output from 'btrfs balance status' command: %s", lines[0]);
goto error;
}
#undef N_MATCH
if (STREQ (lines[0] + ovector[2], "running"))
ret->btrfsbalance_status = strdup("running");
else if (STREQ (lines[0] + ovector[2], "paused"))
ret->btrfsbalance_status = strdup("paused");
else {
reply_with_error ("unexpected output from 'btrfs balance status' command: %s", lines[0]);
goto error;
}
if (nlines < 2) {
reply_with_error ("truncated output from 'btrfs balance status' command");
goto error;
}
if (sscanf (lines[1], "%" SCNu64 " out of about %" SCNu64
" chunks balanced (%" SCNu64 " considered), %" SCNu64 "%% left",
&ret->btrfsbalance_balanced, &ret->btrfsbalance_total,
&ret->btrfsbalance_considered, &ret->btrfsbalance_left) != 4) {
reply_with_perror ("sscanf");
goto error;
}
pcre_free (re);
return ret;
error:
free (ret->btrfsbalance_status);
free (ret);
pcre_free (re);
return NULL;
}
guestfs_int_btrfsscrub *
do_btrfs_scrub_status (const char *path)
{
const size_t MAX_ARGS = 64;
const char *argv[MAX_ARGS];
size_t i = 0;
CLEANUP_FREE char *path_buf = NULL;
CLEANUP_FREE char *err = NULL;
char *out;
int r;
guestfs_int_btrfsscrub *ret;
char **lines;
path_buf = sysroot_path (path);
if (path_buf == NULL) {
reply_with_perror ("malloc");
return NULL;
}
ADD_ARG (argv, i, str_btrfs);
ADD_ARG (argv, i, "scrub");
ADD_ARG (argv, i, "status");
ADD_ARG (argv, i, "-R");
ADD_ARG (argv, i, path_buf);
ADD_ARG (argv, i, NULL);
r = commandv (&out, &err, argv);
if (r == -1) {
reply_with_error ("%s: %s", path, err);
return NULL;
}
if (verbose)
fprintf (stderr, "output from 'btrfs scrub status -R %s' is:\n%s", path, out);
lines = split_lines (out);
if (!lines)
return NULL;
if (count_strings (lines) < 2) {
reply_with_error ("truncated output from 'btrfs scrub status -R' command");
return NULL;
}
ret = calloc (1, sizeof *ret);
if (ret == NULL) {
reply_with_perror ("calloc");
return NULL;
}
/* Output of `btrfs scrub -R status' is like:
*
* scrub status for 346121d1-1847-40f8-9b7b-2bf3d539c68f
* scrub started at Mon Feb 2 17:39:38 2015, running for 93 seconds
* data_extents_scrubbed: 136670
* tree_extents_scrubbed: 30023
* data_bytes_scrubbed: 4474441728
* tree_bytes_scrubbed: 491896832
* read_errors: 0
* csum_errors: 0
* verify_errors: 0
* no_csum: 17760
* csum_discards: 197622
* super_errors: 0
* malloc_errors: 0
* uncorrectable_errors: 0
* unverified_errors: 0
* corrected_errors: 0
* last_physical: 10301341696
*
* or:
*
* scrub status for 346121d1-1847-40f8-9b7b-2bf3d539c68f
* no stats available
*/
for (i = 1; lines[i] != NULL; ++i) {
if ((i == 1) && STREQ (lines[i], "\tno stats available"))
return ret;
else if (STRPREFIX (lines[i], "\tscrub started at"))
continue;
else if (sscanf (lines[i], "\tdata_extents_scrubbed: %" SCNu64,
&ret->btrfsscrub_data_extents_scrubbed) == 1)
continue;
else if (sscanf (lines[i], "\ttree_extents_scrubbed: %" SCNu64,
&ret->btrfsscrub_tree_extents_scrubbed) == 1)
continue;
else if (sscanf (lines[i], "\tdata_bytes_scrubbed: %" SCNu64,
&ret->btrfsscrub_data_bytes_scrubbed) == 1)
continue;
else if (sscanf (lines[i], "\ttree_bytes_scrubbed: %" SCNu64,
&ret->btrfsscrub_tree_bytes_scrubbed) == 1)
continue;
else if (sscanf (lines[i], "\tread_errors: %" SCNu64,
&ret->btrfsscrub_read_errors) == 1)
continue;
else if (sscanf (lines[i], "\tcsum_errors: %" SCNu64,
&ret->btrfsscrub_csum_errors) == 1)
continue;
else if (sscanf (lines[i], "\tverify_errors: %" SCNu64,
&ret->btrfsscrub_verify_errors) == 1)
continue;
else if (sscanf (lines[i], "\tno_csum: %" SCNu64,
&ret->btrfsscrub_no_csum) == 1)
continue;
else if (sscanf (lines[i], "\tcsum_discards: %" SCNu64,
&ret->btrfsscrub_csum_discards) == 1)
continue;
else if (sscanf (lines[i], "\tsuper_errors: %" SCNu64,
&ret->btrfsscrub_super_errors) == 1)
continue;
else if (sscanf (lines[i], "\tmalloc_errors: %" SCNu64,
&ret->btrfsscrub_malloc_errors) == 1)
continue;
else if (sscanf (lines[i], "\tuncorrectable_errors: %" SCNu64,
&ret->btrfsscrub_uncorrectable_errors) == 1)
continue;
else if (sscanf (lines[i], "\tunverified_errors: %" SCNu64,
&ret->btrfsscrub_unverified_errors) == 1)
continue;
else if (sscanf (lines[i], "\tcorrected_errors: %" SCNu64,
&ret->btrfsscrub_corrected_errors) == 1)
continue;
else if (sscanf (lines[i], "\tlast_physical: %" SCNu64,
&ret->btrfsscrub_last_physical) == 1)
continue;
else
goto error;
}
if (i < 17) {
reply_with_error ("truncated output from 'btrfs scrub status -R' command");
free (ret);
return NULL;
}
return ret;
error:
reply_with_error ("%s: could not parse btrfs scrub status.", lines[i]);
free (ret);
return NULL;
}
int
do_btrfstune_seeding (const char *device, int svalue)
{
const size_t MAX_ARGS = 64;
const char *argv[MAX_ARGS];
size_t i = 0;
CLEANUP_FREE char *err = NULL;
int r;
const char *s_value = svalue ? "1" : "0";
ADD_ARG (argv, i, str_btrfstune);
ADD_ARG (argv, i, "-S");
ADD_ARG (argv, i, s_value);
if (svalue == 0)
ADD_ARG (argv, i, "-f");
ADD_ARG (argv, i, device);
ADD_ARG (argv, i, NULL);
r = commandv (NULL, &err, argv);
if (r == -1) {
reply_with_error ("%s: %s", device, err);
return -1;
}
return 0;
}
int
do_btrfstune_enable_extended_inode_refs (const char *device)
{
const size_t MAX_ARGS = 64;
const char *argv[MAX_ARGS];
size_t i = 0;
CLEANUP_FREE char *err = NULL;
int r;
ADD_ARG (argv, i, str_btrfstune);
ADD_ARG (argv, i, "-r");
ADD_ARG (argv, i, device);
ADD_ARG (argv, i, NULL);
r = commandv (NULL, &err, argv);
if (r == -1) {
reply_with_error ("%s: %s", device, err);
return -1;
}
return 0;
}
int
do_btrfstune_enable_skinny_metadata_extent_refs (const char *device)
{
const size_t MAX_ARGS = 64;
const char *argv[MAX_ARGS];
size_t i = 0;
CLEANUP_FREE char *err = NULL;
int r;
ADD_ARG (argv, i, str_btrfstune);
ADD_ARG (argv, i, "-x");
ADD_ARG (argv, i, device);
ADD_ARG (argv, i, NULL);
r = commandv (NULL, &err, argv);
if (r == -1) {
reply_with_error ("%s: %s", device, err);
return -1;
}
return 0;
}
int
do_btrfs_image (char *const *sources, const char *image,
int compresslevel)
{
size_t nr_sources = count_strings (sources);
const size_t MAX_ARGS = 64 + nr_sources;
const char *argv[MAX_ARGS];
size_t i = 0, j;
CLEANUP_FREE char *err = NULL;
char compresslevel_s[64];
int r;
if (nr_sources == 0) {
reply_with_error ("list of sources must be non-empty");
return -1;
}
ADD_ARG (argv, i, str_btrfsimage);
if ((optargs_bitmask & GUESTFS_BTRFS_IMAGE_COMPRESSLEVEL_BITMASK)
&& compresslevel >= 0) {
snprintf (compresslevel_s, sizeof compresslevel_s, "%d", compresslevel);
ADD_ARG (argv, i, "-c");
ADD_ARG (argv, i, compresslevel_s);
}
for (j = 0; j < nr_sources; ++j)
ADD_ARG (argv, i, sources[j]);
ADD_ARG (argv, i, image);
ADD_ARG (argv, i, NULL);
r = commandv (NULL, &err, argv);
if (r == -1) {
reply_with_error ("%s %s: %s", sources[0], image, err);
return -1;
}
return 0;
}
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