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btrfs-progs/cmds-scrub.c

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/*
* Copyright (C) 2011 STRATO. All rights reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License v2 as published by the Free Software Foundation.
*
* 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., 59 Temple Place - Suite 330,
* Boston, MA 021110-1307, USA.
*/
#include "kerncompat.h"
#include <sys/ioctl.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/syscall.h>
#include <poll.h>
#include <sys/file.h>
#include <uuid/uuid.h>
#include <fcntl.h>
#include <unistd.h>
#include <pthread.h>
#include <ctype.h>
#include <signal.h>
#include <stdarg.h>
#include "ctree.h"
#include "ioctl.h"
#include "utils.h"
#include "volumes.h"
#include "disk-io.h"
#include "commands.h"
static const char * const scrub_cmd_group_usage[] = {
"btrfs scrub <command> [options] <path>|<device>",
NULL
};
#define SCRUB_DATA_FILE "/var/lib/btrfs/scrub.status"
#define SCRUB_PROGRESS_SOCKET_PATH "/var/lib/btrfs/scrub.progress"
#define SCRUB_FILE_VERSION_PREFIX "scrub status"
#define SCRUB_FILE_VERSION "1"
struct scrub_stats {
time_t t_start;
time_t t_resumed;
u64 duration;
u64 finished;
u64 canceled;
int in_progress;
};
/* TBD: replace with #include "linux/ioprio.h" in some years */
#if !defined (IOPRIO_H)
#define IOPRIO_WHO_PROCESS 1
#define IOPRIO_CLASS_SHIFT 13
#define IOPRIO_PRIO_VALUE(class, data) \
(((class) << IOPRIO_CLASS_SHIFT) | (data))
#define IOPRIO_CLASS_IDLE 3
#endif
struct scrub_progress {
struct btrfs_ioctl_scrub_args scrub_args;
int fd;
int ret;
int skip;
struct scrub_stats stats;
struct scrub_file_record *resumed;
int ioctl_errno;
pthread_mutex_t progress_mutex;
int ioprio_class;
int ioprio_classdata;
};
struct scrub_file_record {
u8 fsid[BTRFS_FSID_SIZE];
u64 devid;
struct scrub_stats stats;
struct btrfs_scrub_progress p;
};
struct scrub_progress_cycle {
int fdmnt;
int prg_fd;
int do_record;
struct btrfs_ioctl_fs_info_args *fi;
struct scrub_progress *progress;
struct scrub_progress *shared_progress;
pthread_mutex_t *write_mutex;
};
struct scrub_fs_stat {
struct btrfs_scrub_progress p;
struct scrub_stats s;
int i;
};
static void print_scrub_full(struct btrfs_scrub_progress *sp)
{
printf("\tdata_extents_scrubbed: %lld\n", sp->data_extents_scrubbed);
printf("\ttree_extents_scrubbed: %lld\n", sp->tree_extents_scrubbed);
printf("\tdata_bytes_scrubbed: %lld\n", sp->data_bytes_scrubbed);
printf("\ttree_bytes_scrubbed: %lld\n", sp->tree_bytes_scrubbed);
printf("\tread_errors: %lld\n", sp->read_errors);
printf("\tcsum_errors: %lld\n", sp->csum_errors);
printf("\tverify_errors: %lld\n", sp->verify_errors);
printf("\tno_csum: %lld\n", sp->no_csum);
printf("\tcsum_discards: %lld\n", sp->csum_discards);
printf("\tsuper_errors: %lld\n", sp->super_errors);
printf("\tmalloc_errors: %lld\n", sp->malloc_errors);
printf("\tuncorrectable_errors: %lld\n", sp->uncorrectable_errors);
printf("\tunverified_errors: %lld\n", sp->unverified_errors);
printf("\tcorrected_errors: %lld\n", sp->corrected_errors);
printf("\tlast_physical: %lld\n", sp->last_physical);
}
#define ERR(test, ...) do { \
if (test) \
fprintf(stderr, __VA_ARGS__); \
} while (0)
#define PRINT_SCRUB_ERROR(test, desc) do { \
if (test) \
printf(" %s=%llu", desc, test); \
} while (0)
static void print_scrub_summary(struct btrfs_scrub_progress *p)
{
u64 err_cnt;
u64 err_cnt2;
err_cnt = p->read_errors +
p->csum_errors +
p->verify_errors +
p->super_errors;
err_cnt2 = p->corrected_errors + p->uncorrectable_errors;
if (p->malloc_errors)
printf("*** WARNING: memory allocation failed while scrubbing. "
"results may be inaccurate\n");
printf("\ttotal bytes scrubbed: %s with %llu errors\n",
pretty_size(p->data_bytes_scrubbed + p->tree_bytes_scrubbed),
max(err_cnt, err_cnt2));
if (err_cnt || err_cnt2) {
printf("\terror details:");
PRINT_SCRUB_ERROR(p->read_errors, "read");
PRINT_SCRUB_ERROR(p->super_errors, "super");
PRINT_SCRUB_ERROR(p->verify_errors, "verify");
PRINT_SCRUB_ERROR(p->csum_errors, "csum");
printf("\n");
printf("\tcorrected errors: %llu, uncorrectable errors: %llu, "
"unverified errors: %llu\n", p->corrected_errors,
p->uncorrectable_errors, p->unverified_errors);
}
}
#define _SCRUB_FS_STAT(p, name, fs_stat) do { \
fs_stat->p.name += p->name; \
} while (0)
#define _SCRUB_FS_STAT_MIN(ss, name, fs_stat) \
do { \
if (fs_stat->s.name > ss->name) { \
fs_stat->s.name = ss->name; \
} \
} while (0)
#define _SCRUB_FS_STAT_ZMIN(ss, name, fs_stat) \
do { \
if (!fs_stat->s.name || fs_stat->s.name > ss->name) { \
fs_stat->s.name = ss->name; \
} \
} while (0)
#define _SCRUB_FS_STAT_ZMAX(ss, name, fs_stat) \
do { \
if (!(fs_stat)->s.name || (fs_stat)->s.name < (ss)->name) { \
(fs_stat)->s.name = (ss)->name; \
} \
} while (0)
static void add_to_fs_stat(struct btrfs_scrub_progress *p,
struct scrub_stats *ss,
struct scrub_fs_stat *fs_stat)
{
_SCRUB_FS_STAT(p, data_extents_scrubbed, fs_stat);
_SCRUB_FS_STAT(p, tree_extents_scrubbed, fs_stat);
_SCRUB_FS_STAT(p, data_bytes_scrubbed, fs_stat);
_SCRUB_FS_STAT(p, tree_bytes_scrubbed, fs_stat);
_SCRUB_FS_STAT(p, read_errors, fs_stat);
_SCRUB_FS_STAT(p, csum_errors, fs_stat);
_SCRUB_FS_STAT(p, verify_errors, fs_stat);
_SCRUB_FS_STAT(p, no_csum, fs_stat);
_SCRUB_FS_STAT(p, csum_discards, fs_stat);
_SCRUB_FS_STAT(p, super_errors, fs_stat);
_SCRUB_FS_STAT(p, malloc_errors, fs_stat);
_SCRUB_FS_STAT(p, uncorrectable_errors, fs_stat);
_SCRUB_FS_STAT(p, corrected_errors, fs_stat);
_SCRUB_FS_STAT(p, last_physical, fs_stat);
_SCRUB_FS_STAT_ZMIN(ss, t_start, fs_stat);
_SCRUB_FS_STAT_ZMIN(ss, t_resumed, fs_stat);
_SCRUB_FS_STAT_ZMAX(ss, duration, fs_stat);
_SCRUB_FS_STAT_ZMAX(ss, canceled, fs_stat);
_SCRUB_FS_STAT_MIN(ss, finished, fs_stat);
}
static void init_fs_stat(struct scrub_fs_stat *fs_stat)
{
memset(fs_stat, 0, sizeof(*fs_stat));
fs_stat->s.finished = 1;
}
static void _print_scrub_ss(struct scrub_stats *ss)
{
char t[4096];
struct tm tm;
if (!ss || !ss->t_start) {
printf("\tno stats available\n");
return;
}
if (ss->t_resumed) {
localtime_r(&ss->t_resumed, &tm);
strftime(t, sizeof(t), "%c", &tm);
t[sizeof(t) - 1] = '\0';
printf("\tscrub resumed at %s", t);
} else {
localtime_r(&ss->t_start, &tm);
strftime(t, sizeof(t), "%c", &tm);
t[sizeof(t) - 1] = '\0';
printf("\tscrub started at %s", t);
}
if (ss->finished && !ss->canceled) {
printf(" and finished after %llu seconds\n",
ss->duration);
} else if (ss->canceled) {
printf(" and was aborted after %llu seconds\n",
ss->duration);
} else {
if (ss->in_progress)
printf(", running for %llu seconds\n", ss->duration);
else
printf(", interrupted after %llu seconds, not running\n",
ss->duration);
}
}
static void print_scrub_dev(struct btrfs_ioctl_dev_info_args *di,
struct btrfs_scrub_progress *p, int raw,
const char *append, struct scrub_stats *ss)
{
printf("scrub device %s (id %llu) %s\n", di->path, di->devid,
append ? append : "");
_print_scrub_ss(ss);
if (p) {
if (raw)
print_scrub_full(p);
else
print_scrub_summary(p);
}
}
static void print_fs_stat(struct scrub_fs_stat *fs_stat, int raw)
{
_print_scrub_ss(&fs_stat->s);
if (raw)
print_scrub_full(&fs_stat->p);
else
print_scrub_summary(&fs_stat->p);
}
static void free_history(struct scrub_file_record **last_scrubs)
{
struct scrub_file_record **l = last_scrubs;
if (!l || IS_ERR(l))
return;
while (*l)
free(*l++);
free(last_scrubs);
}
/*
* cancels a running scrub and makes the master process record the current
* progress status before exiting.
*/
static int cancel_fd = -1;
static void scrub_sigint_record_progress(int signal)
{
int ret;
ret = ioctl(cancel_fd, BTRFS_IOC_SCRUB_CANCEL, NULL);
if (ret < 0)
perror("Scrub cancel failed");
}
static int scrub_handle_sigint_parent(void)
{
struct sigaction sa = {
.sa_handler = SIG_IGN,
.sa_flags = SA_RESTART,
};
return sigaction(SIGINT, &sa, NULL);
}
static int scrub_handle_sigint_child(int fd)
{
struct sigaction sa = {
.sa_handler = fd == -1 ? SIG_DFL : scrub_sigint_record_progress,
};
cancel_fd = fd;
return sigaction(SIGINT, &sa, NULL);
}
static int scrub_datafile(const char *fn_base, const char *fn_local,
const char *fn_tmp, char *datafile, int size)
{
int ret;
int end = size - 2;
datafile[end + 1] = '\0';
strncpy(datafile, fn_base, end);
ret = strlen(datafile);
if (ret + 1 > end)
return -EOVERFLOW;
datafile[ret] = '.';
strncpy(datafile + ret + 1, fn_local, end - ret - 1);
ret = strlen(datafile);
if (ret + 1 > end)
return -EOVERFLOW;
if (fn_tmp) {
datafile[ret] = '_';
strncpy(datafile + ret + 1, fn_tmp, end - ret - 1);
ret = strlen(datafile);
if (ret > end)
return -EOVERFLOW;
}
return 0;
}
static int scrub_open_file(const char *datafile, int m)
{
int fd;
int ret;
fd = open(datafile, m, 0600);
if (fd < 0)
return -errno;
ret = flock(fd, LOCK_EX|LOCK_NB);
if (ret) {
ret = errno;
close(fd);
return -ret;
}
return fd;
}
static int scrub_open_file_r(const char *fn_base, const char *fn_local)
{
int ret;
char datafile[BTRFS_PATH_NAME_MAX + 1];
ret = scrub_datafile(fn_base, fn_local, NULL,
datafile, sizeof(datafile));
if (ret < 0)
return ret;
return scrub_open_file(datafile, O_RDONLY);
}
static int scrub_open_file_w(const char *fn_base, const char *fn_local,
const char *tmp)
{
int ret;
char datafile[BTRFS_PATH_NAME_MAX + 1];
ret = scrub_datafile(fn_base, fn_local, tmp,
datafile, sizeof(datafile));
if (ret < 0)
return ret;
return scrub_open_file(datafile, O_WRONLY|O_CREAT);
}
static int scrub_rename_file(const char *fn_base, const char *fn_local,
const char *tmp)
{
int ret;
char datafile_old[BTRFS_PATH_NAME_MAX + 1];
char datafile_new[BTRFS_PATH_NAME_MAX + 1];
ret = scrub_datafile(fn_base, fn_local, tmp,
datafile_old, sizeof(datafile_old));
if (ret < 0)
return ret;
ret = scrub_datafile(fn_base, fn_local, NULL,
datafile_new, sizeof(datafile_new));
if (ret < 0)
return ret;
ret = rename(datafile_old, datafile_new);
return ret ? -errno : 0;
}
#define _SCRUB_KVREAD(ret, i, name, avail, l, dest) if (ret == 0) { \
ret = scrub_kvread(i, sizeof(#name), avail, l, #name, dest.name); \
}
/*
* returns 0 if the key did not match (nothing was read)
* 1 if the key did match (success)
* -1 if the key did match and an error occured
*/
static int scrub_kvread(int *i, int len, int avail, const char *buf,
const char *key, u64 *dest)
{
int j;
if (*i + len + 1 < avail && strncmp(&buf[*i], key, len - 1) == 0) {
*i += len - 1;
if (buf[*i] != ':')
return -1;
*i += 1;
for (j = 0; isdigit(buf[*i + j]) && *i + j < avail; ++j)
;
if (*i + j >= avail)
return -1;
*dest = atoll(&buf[*i]);
*i += j;
return 1;
}
return 0;
}
#define _SCRUB_INVALID do { \
if (report_errors) \
fprintf(stderr, "WARNING: invalid data in line %d pos " \
"%d state %d (near \"%.*s\") at %s:%d\n", \
lineno, i, state, 20 > avail ? avail : 20, \
l + i, __FILE__, __LINE__); \
goto skip; \
} while (0)
static struct scrub_file_record **scrub_read_file(int fd, int report_errors)
{
int avail = 0;
int old_avail = 0;
char l[16 * 1024];
int state = 0;
int curr = -1;
int i = 0;
int j;
int ret;
int eof = 0;
int lineno = 0;
u64 version;
char empty_uuid[BTRFS_FSID_SIZE] = {0};
struct scrub_file_record **p = NULL;
again:
old_avail = avail - i;
BUG_ON(old_avail < 0);
if (old_avail)
memmove(l, l + i, old_avail);
avail = read(fd, l + old_avail, sizeof(l) - old_avail);
if (avail == 0)
eof = 1;
if (avail == 0 && old_avail == 0) {
if (curr >= 0 &&
memcmp(p[curr]->fsid, empty_uuid, BTRFS_FSID_SIZE) == 0) {
p[curr] = NULL;
} else if (curr == -1) {
p = ERR_PTR(-ENODATA);
}
return p;
}
if (avail == -1)
return ERR_PTR(-errno);
avail += old_avail;
i = 0;
while (i < avail) {
switch (state) {
case 0: /* start of file */
ret = scrub_kvread(&i,
sizeof(SCRUB_FILE_VERSION_PREFIX), avail, l,
SCRUB_FILE_VERSION_PREFIX, &version);
if (ret != 1)
_SCRUB_INVALID;
if (version != atoll(SCRUB_FILE_VERSION))
return ERR_PTR(-ENOTSUP);
state = 6;
continue;
case 1: /* start of line, alloc */
/*
* this state makes sure we have a complete line in
* further processing, so we don't need wrap-tracking
* everywhere.
*/
if (!eof && !memchr(l + i, '\n', avail - i))
goto again;
++lineno;
if (curr > -1 && memcmp(p[curr]->fsid, empty_uuid,
BTRFS_FSID_SIZE) == 0) {
state = 2;
continue;
}
++curr;
p = realloc(p, (curr + 2) * sizeof(*p));
if (p)
p[curr] = malloc(sizeof(**p));
if (!p || !p[curr])
return ERR_PTR(-errno);
memset(p[curr], 0, sizeof(**p));
p[curr + 1] = NULL;
++state;
/* fall through */
case 2: /* start of line, skip space */
while (isspace(l[i]) && i < avail) {
if (l[i] == '\n')
++lineno;
++i;
}
if (i >= avail ||
(!eof && !memchr(l + i, '\n', avail - i)))
goto again;
++state;
/* fall through */
case 3: /* read fsid */
if (i == avail)
continue;
for (j = 0; l[i + j] != ':' && i + j < avail; ++j)
;
if (i + j + 1 >= avail)
_SCRUB_INVALID;
if (j != BTRFS_UUID_UNPARSED_SIZE - 1)
_SCRUB_INVALID;
l[i + j] = '\0';
ret = uuid_parse(l + i, p[curr]->fsid);
if (ret)
_SCRUB_INVALID;
i += j + 1;
++state;
/* fall through */
case 4: /* read dev id */
for (j = 0; isdigit(l[i + j]) && i+j < avail; ++j)
;
if (j == 0 || i + j + 1 >= avail)
_SCRUB_INVALID;
p[curr]->devid = atoll(&l[i]);
i += j + 1;
++state;
/* fall through */
case 5: /* read key/value pair */
ret = 0;
_SCRUB_KVREAD(ret, &i, data_extents_scrubbed, avail, l,
&p[curr]->p);
_SCRUB_KVREAD(ret, &i, data_extents_scrubbed, avail, l,
&p[curr]->p);
_SCRUB_KVREAD(ret, &i, tree_extents_scrubbed, avail, l,
&p[curr]->p);
_SCRUB_KVREAD(ret, &i, data_bytes_scrubbed, avail, l,
&p[curr]->p);
_SCRUB_KVREAD(ret, &i, tree_bytes_scrubbed, avail, l,
&p[curr]->p);
_SCRUB_KVREAD(ret, &i, read_errors, avail, l,
&p[curr]->p);
_SCRUB_KVREAD(ret, &i, csum_errors, avail, l,
&p[curr]->p);
_SCRUB_KVREAD(ret, &i, verify_errors, avail, l,
&p[curr]->p);
_SCRUB_KVREAD(ret, &i, no_csum, avail, l,
&p[curr]->p);
_SCRUB_KVREAD(ret, &i, csum_discards, avail, l,
&p[curr]->p);
_SCRUB_KVREAD(ret, &i, super_errors, avail, l,
&p[curr]->p);
_SCRUB_KVREAD(ret, &i, malloc_errors, avail, l,
&p[curr]->p);
_SCRUB_KVREAD(ret, &i, uncorrectable_errors, avail, l,
&p[curr]->p);
_SCRUB_KVREAD(ret, &i, corrected_errors, avail, l,
&p[curr]->p);
_SCRUB_KVREAD(ret, &i, last_physical, avail, l,
&p[curr]->p);
_SCRUB_KVREAD(ret, &i, finished, avail, l,
&p[curr]->stats);
_SCRUB_KVREAD(ret, &i, t_start, avail, l,
(u64 *)&p[curr]->stats);
_SCRUB_KVREAD(ret, &i, t_resumed, avail, l,
(u64 *)&p[curr]->stats);
_SCRUB_KVREAD(ret, &i, duration, avail, l,
(u64 *)&p[curr]->stats);
_SCRUB_KVREAD(ret, &i, canceled, avail, l,
&p[curr]->stats);
if (ret != 1)
_SCRUB_INVALID;
++state;
/* fall through */
case 6: /* after number */
if (l[i] == '|')
state = 5;
else if (l[i] == '\n')
state = 1;
else
_SCRUB_INVALID;
++i;
continue;
case 99: /* skip rest of line */
skip:
state = 99;
do {
++i;
if (l[i - 1] == '\n') {
state = 1;
break;
}
} while (i < avail);
continue;
}
BUG();
}
goto again;
}
static int scrub_write_buf(int fd, const void *data, int len)
{
int ret;
ret = write(fd, data, len);
return ret - len;
}
static int scrub_writev(int fd, char *buf, int max, const char *fmt, ...)
__attribute__ ((format (printf, 4, 5)));
static int scrub_writev(int fd, char *buf, int max, const char *fmt, ...)
{
int ret;
va_list args;
va_start(args, fmt);
ret = vsnprintf(buf, max, fmt, args);
va_end(args);
if (ret >= max)
return ret - max;
return scrub_write_buf(fd, buf, ret);
}
#define _SCRUB_SUM(dest, data, name) dest->scrub_args.progress.name = \
data->resumed->p.name + data->scrub_args.progress.name
static struct scrub_progress *scrub_resumed_stats(struct scrub_progress *data,
struct scrub_progress *dest)
{
if (!data->resumed || data->skip)
return data;
_SCRUB_SUM(dest, data, data_extents_scrubbed);
_SCRUB_SUM(dest, data, tree_extents_scrubbed);
_SCRUB_SUM(dest, data, data_bytes_scrubbed);
_SCRUB_SUM(dest, data, tree_bytes_scrubbed);
_SCRUB_SUM(dest, data, read_errors);
_SCRUB_SUM(dest, data, csum_errors);
_SCRUB_SUM(dest, data, verify_errors);
_SCRUB_SUM(dest, data, no_csum);
_SCRUB_SUM(dest, data, csum_discards);
_SCRUB_SUM(dest, data, super_errors);
_SCRUB_SUM(dest, data, malloc_errors);
_SCRUB_SUM(dest, data, uncorrectable_errors);
_SCRUB_SUM(dest, data, corrected_errors);
_SCRUB_SUM(dest, data, last_physical);
dest->stats.canceled = data->stats.canceled;
dest->stats.finished = data->stats.finished;
dest->stats.t_resumed = data->stats.t_start;
dest->stats.t_start = data->resumed->stats.t_start;
dest->stats.duration = data->resumed->stats.duration +
data->stats.duration;
dest->scrub_args.devid = data->scrub_args.devid;
return dest;
}
#define _SCRUB_KVWRITE(fd, buf, name, use) \
scrub_kvwrite(fd, buf, sizeof(buf), #name, \
use->scrub_args.progress.name)
#define _SCRUB_KVWRITE_STATS(fd, buf, name, use) \
scrub_kvwrite(fd, buf, sizeof(buf), #name, \
use->stats.name)
static int scrub_kvwrite(int fd, char *buf, int max, const char *key, u64 val)
{
return scrub_writev(fd, buf, max, "|%s:%lld", key, val);
}
static int scrub_write_file(int fd, const char *fsid,
struct scrub_progress *data, int n)
{
int ret = 0;
int i;
char buf[1024];
struct scrub_progress local;
struct scrub_progress *use;
if (n < 1)
return -EINVAL;
/* each -1 is to subtract one \0 byte, the + 2 is for ':' and '\n' */
ret = scrub_write_buf(fd, SCRUB_FILE_VERSION_PREFIX ":"
SCRUB_FILE_VERSION "\n",
(sizeof(SCRUB_FILE_VERSION_PREFIX) - 1) +
(sizeof(SCRUB_FILE_VERSION) - 1) + 2);
if (ret)
return -EOVERFLOW;
for (i = 0; i < n; ++i) {
use = scrub_resumed_stats(&data[i], &local);
if (scrub_write_buf(fd, fsid, strlen(fsid)) ||
scrub_write_buf(fd, ":", 1) ||
scrub_writev(fd, buf, sizeof(buf), "%lld",
use->scrub_args.devid) ||
scrub_write_buf(fd, buf, ret) ||
_SCRUB_KVWRITE(fd, buf, data_extents_scrubbed, use) ||
_SCRUB_KVWRITE(fd, buf, tree_extents_scrubbed, use) ||
_SCRUB_KVWRITE(fd, buf, data_bytes_scrubbed, use) ||
_SCRUB_KVWRITE(fd, buf, tree_bytes_scrubbed, use) ||
_SCRUB_KVWRITE(fd, buf, read_errors, use) ||
_SCRUB_KVWRITE(fd, buf, csum_errors, use) ||
_SCRUB_KVWRITE(fd, buf, verify_errors, use) ||
_SCRUB_KVWRITE(fd, buf, no_csum, use) ||
_SCRUB_KVWRITE(fd, buf, csum_discards, use) ||
_SCRUB_KVWRITE(fd, buf, super_errors, use) ||
_SCRUB_KVWRITE(fd, buf, malloc_errors, use) ||
_SCRUB_KVWRITE(fd, buf, uncorrectable_errors, use) ||
_SCRUB_KVWRITE(fd, buf, corrected_errors, use) ||
_SCRUB_KVWRITE(fd, buf, last_physical, use) ||
_SCRUB_KVWRITE_STATS(fd, buf, t_start, use) ||
_SCRUB_KVWRITE_STATS(fd, buf, t_resumed, use) ||
_SCRUB_KVWRITE_STATS(fd, buf, duration, use) ||
_SCRUB_KVWRITE_STATS(fd, buf, canceled, use) ||
_SCRUB_KVWRITE_STATS(fd, buf, finished, use) ||
scrub_write_buf(fd, "\n", 1)) {
return -EOVERFLOW;
}
}
return 0;
}
static int scrub_write_progress(pthread_mutex_t *m, const char *fsid,
struct scrub_progress *data, int n)
{
int ret;
int err;
int fd = -1;
int old;
ret = pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &old);
if (ret) {
err = -ret;
goto out3;
}
ret = pthread_mutex_lock(m);
if (ret) {
err = -ret;
goto out2;
}
fd = scrub_open_file_w(SCRUB_DATA_FILE, fsid, "tmp");
if (fd < 0) {
err = fd;
goto out1;
}
err = scrub_write_file(fd, fsid, data, n);
if (err)
goto out1;
err = scrub_rename_file(SCRUB_DATA_FILE, fsid, "tmp");
if (err)
goto out1;
out1:
if (fd >= 0) {
ret = close(fd);
if (ret)
err = -errno;
}
ret = pthread_mutex_unlock(m);
if (ret && !err)
err = -ret;
out2:
ret = pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, &old);
if (ret && !err)
err = -ret;
out3:
return err;
}
static void *scrub_one_dev(void *ctx)
{
struct scrub_progress *sp = ctx;
int ret;
struct timeval tv;
sp->stats.canceled = 0;
sp->stats.duration = 0;
sp->stats.finished = 0;
ret = syscall(SYS_ioprio_set, IOPRIO_WHO_PROCESS, 0,
IOPRIO_PRIO_VALUE(sp->ioprio_class,
sp->ioprio_classdata));
if (ret)
fprintf(stderr,
"WARNING: setting ioprio failed: %s (ignored).\n",
strerror(errno));
ret = ioctl(sp->fd, BTRFS_IOC_SCRUB, &sp->scrub_args);
gettimeofday(&tv, NULL);
sp->ret = ret;
sp->stats.duration = tv.tv_sec - sp->stats.t_start;
sp->stats.canceled = !!ret;
sp->ioctl_errno = errno;
ret = pthread_mutex_lock(&sp->progress_mutex);
if (ret)
return ERR_PTR(-ret);
sp->stats.finished = 1;
ret = pthread_mutex_unlock(&sp->progress_mutex);
if (ret)
return ERR_PTR(-ret);
return NULL;
}
static void *progress_one_dev(void *ctx)
{
struct scrub_progress *sp = ctx;
sp->ret = ioctl(sp->fd, BTRFS_IOC_SCRUB_PROGRESS, &sp->scrub_args);
sp->ioctl_errno = errno;
return NULL;
}
/* nb: returns a negative errno via ERR_PTR */
static void *scrub_progress_cycle(void *ctx)
{
int ret = 0;
int perr = 0; /* positive / pthread error returns */
int old;
int i;
char fsid[BTRFS_UUID_UNPARSED_SIZE];
struct scrub_progress *sp;
struct scrub_progress *sp_last;
struct scrub_progress *sp_shared;
struct timeval tv;
struct scrub_progress_cycle *spc = ctx;
int ndev = spc->fi->num_devices;
int this = 1;
int last = 0;
int peer_fd = -1;
struct pollfd accept_poll_fd = {
.fd = spc->prg_fd,
.events = POLLIN,
.revents = 0,
};
struct pollfd write_poll_fd = {
.events = POLLOUT,
.revents = 0,
};
struct sockaddr_un peer;
socklen_t peer_size = sizeof(peer);
perr = pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, &old);
if (perr)
goto out;
uuid_unparse(spc->fi->fsid, fsid);
for (i = 0; i < ndev; ++i) {
sp = &spc->progress[i];
sp_last = &spc->progress[i + ndev];
sp_shared = &spc->shared_progress[i];
sp->scrub_args.devid = sp_last->scrub_args.devid =
sp_shared->scrub_args.devid;
sp->fd = sp_last->fd = spc->fdmnt;
sp->stats.t_start = sp_last->stats.t_start =
sp_shared->stats.t_start;
sp->resumed = sp_last->resumed = sp_shared->resumed;
sp->skip = sp_last->skip = sp_shared->skip;
sp->stats.finished = sp_last->stats.finished =
sp_shared->stats.finished;
}
while (1) {
ret = poll(&accept_poll_fd, 1, 5 * 1000);
if (ret == -1) {
ret = -errno;
goto out;
}
if (ret)
peer_fd = accept(spc->prg_fd, (struct sockaddr *)&peer,
&peer_size);
gettimeofday(&tv, NULL);
this = (this + 1)%2;
last = (last + 1)%2;
for (i = 0; i < ndev; ++i) {
sp = &spc->progress[this * ndev + i];
sp_last = &spc->progress[last * ndev + i];
sp_shared = &spc->shared_progress[i];
if (sp->stats.finished)
continue;
progress_one_dev(sp);
sp->stats.duration = tv.tv_sec - sp->stats.t_start;
if (!sp->ret)
continue;
if (sp->ioctl_errno != ENOTCONN &&
sp->ioctl_errno != ENODEV) {
ret = -sp->ioctl_errno;
goto out;
}
/*
* scrub finished or device removed, check the
* finished flag. if unset, just use the last
* result we got for the current write and go
* on. flag should be set on next cycle, then.
*/
perr = pthread_setcancelstate(
PTHREAD_CANCEL_DISABLE, &old);
if (perr)
goto out;
perr = pthread_mutex_lock(&sp_shared->progress_mutex);
if (perr)
goto out;
if (!sp_shared->stats.finished) {
perr = pthread_mutex_unlock(
&sp_shared->progress_mutex);
if (perr)
goto out;
perr = pthread_setcancelstate(
PTHREAD_CANCEL_ENABLE, &old);
if (perr)
goto out;
memcpy(sp, sp_last, sizeof(*sp));
continue;
}
perr = pthread_mutex_unlock(&sp_shared->progress_mutex);
if (perr)
goto out;
perr = pthread_setcancelstate(
PTHREAD_CANCEL_ENABLE, &old);
if (perr)
goto out;
memcpy(sp, sp_shared, sizeof(*sp));
memcpy(sp_last, sp_shared, sizeof(*sp));
}
if (peer_fd != -1) {
write_poll_fd.fd = peer_fd;
ret = poll(&write_poll_fd, 1, 0);
if (ret == -1) {
ret = -errno;
goto out;
}
if (ret) {
ret = scrub_write_file(
peer_fd, fsid,
&spc->progress[this * ndev], ndev);
if (ret)
goto out;
}
close(peer_fd);
peer_fd = -1;
}
if (!spc->do_record)
continue;
ret = scrub_write_progress(spc->write_mutex, fsid,
&spc->progress[this * ndev], ndev);
if (ret)
goto out;
}
out:
if (peer_fd != -1)
close(peer_fd);
if (perr)
ret = -perr;
return ERR_PTR(ret);
}
static struct scrub_file_record *last_dev_scrub(
struct scrub_file_record *const *const past_scrubs, u64 devid)
{
int i;
if (!past_scrubs || IS_ERR(past_scrubs))
return NULL;
for (i = 0; past_scrubs[i]; ++i)
if (past_scrubs[i]->devid == devid)
return past_scrubs[i];
return NULL;
}
static int mkdir_p(char *path)
{
int i;
int ret;
for (i = 1; i < strlen(path); ++i) {
if (path[i] != '/')
continue;
path[i] = '\0';
ret = mkdir(path, 0777);
if (ret && errno != EEXIST)
return -errno;
path[i] = '/';
}
return 0;
}
static int is_scrub_running_on_fs(struct btrfs_ioctl_fs_info_args *fi_args,
struct btrfs_ioctl_dev_info_args *di_args,
struct scrub_file_record **past_scrubs)
{
int i;
if (!fi_args || !di_args || !past_scrubs)
return 0;
for (i = 0; i < fi_args->num_devices; i++) {
struct scrub_file_record *sfr =
last_dev_scrub(past_scrubs, di_args[i].devid);
if (!sfr)
continue;
if (!(sfr->stats.finished || sfr->stats.canceled))
return 1;
}
return 0;
}
static int is_scrub_running_in_kernel(int fd,
struct btrfs_ioctl_dev_info_args *di_args, u64 max_devices)
{
struct scrub_progress sp;
int i;
int ret;
for (i = 0; i < max_devices; i++) {
memset(&sp, 0, sizeof(sp));
sp.scrub_args.devid = di_args[i].devid;
ret = ioctl(fd, BTRFS_IOC_SCRUB_PROGRESS, &sp.scrub_args);
if (!ret)
return 1;
}
return 0;
}
static const char * const cmd_scrub_start_usage[];
static const char * const cmd_scrub_resume_usage[];
static int scrub_start(int argc, char **argv, int resume)
{
int fdmnt;
int prg_fd = -1;
int fdres = -1;
int ret;
pid_t pid;
int c;
int i;
int err = 0;
int e_uncorrectable = 0;
int e_correctable = 0;
int print_raw = 0;
char *path;
int do_background = 1;
int do_wait = 0;
int do_print = 0;
int do_quiet = 0;
int do_record = 1;
int readonly = 0;
int do_stats_per_dev = 0;
int ioprio_class = IOPRIO_CLASS_IDLE;
int ioprio_classdata = 0;
int n_start = 0;
int n_skip = 0;
int n_resume = 0;
struct btrfs_ioctl_fs_info_args fi_args;
struct btrfs_ioctl_dev_info_args *di_args = NULL;
struct scrub_progress *sp = NULL;
struct scrub_fs_stat fs_stat;
struct timeval tv;
struct sockaddr_un addr = {
.sun_family = AF_UNIX,
};
pthread_t *t_devs = NULL;
pthread_t t_prog;
struct scrub_file_record **past_scrubs = NULL;
struct scrub_file_record *last_scrub = NULL;
char *datafile = strdup(SCRUB_DATA_FILE);
char fsid[BTRFS_UUID_UNPARSED_SIZE];
char sock_path[BTRFS_PATH_NAME_MAX + 1] = "";
struct scrub_progress_cycle spc;
pthread_mutex_t spc_write_mutex = PTHREAD_MUTEX_INITIALIZER;
void *terr;
u64 devid;
DIR *dirstream = NULL;
int force = 0;
int nothing_to_resume = 0;
optind = 1;
while ((c = getopt(argc, argv, "BdqrRc:n:f")) != -1) {
switch (c) {
case 'B':
do_background = 0;
do_wait = 1;
do_print = 1;
break;
case 'd':
do_stats_per_dev = 1;
break;
case 'q':
do_quiet = 1;
break;
case 'r':
readonly = 1;
break;
case 'R':
print_raw = 1;
break;
case 'c':
ioprio_class = (int)strtol(optarg, NULL, 10);
break;
case 'n':
ioprio_classdata = (int)strtol(optarg, NULL, 10);
break;
case 'f':
force = 1;
break;
case '?':
default:
usage(resume ? cmd_scrub_resume_usage :
cmd_scrub_start_usage);
}
}
/* try to catch most error cases before forking */
if (check_argc_exact(argc - optind, 1)) {
usage(resume ? cmd_scrub_resume_usage :
cmd_scrub_start_usage);
}
spc.progress = NULL;
if (do_quiet && do_print)
do_print = 0;
if (mkdir_p(datafile)) {
ERR(!do_quiet, "WARNING: cannot create scrub data "
"file, mkdir %s failed: %s. Status recording "
"disabled\n", datafile, strerror(errno));
do_record = 0;
}
free(datafile);
path = argv[optind];
fdmnt = open_path_or_dev_mnt(path, &dirstream);
if (fdmnt < 0) {
if (errno == EINVAL)
ERR(!do_quiet,
"ERROR: '%s' is not a mounted btrfs device\n",
path);
else
ERR(!do_quiet, "ERROR: can't access '%s': %s\n",
path, strerror(errno));
return 1;
}
ret = get_fs_info(path, &fi_args, &di_args);
if (ret) {
ERR(!do_quiet, "ERROR: getting dev info for scrub failed: "
"%s\n", strerror(-ret));
err = 1;
goto out;
}
if (!fi_args.num_devices) {
ERR(!do_quiet, "ERROR: no devices found\n");
err = 1;
goto out;
}
uuid_unparse(fi_args.fsid, fsid);
fdres = scrub_open_file_r(SCRUB_DATA_FILE, fsid);
if (fdres < 0 && fdres != -ENOENT) {
ERR(!do_quiet, "WARNING: failed to open status file: "
"%s\n", strerror(-fdres));
} else if (fdres >= 0) {
past_scrubs = scrub_read_file(fdres, !do_quiet);
if (IS_ERR(past_scrubs))
ERR(!do_quiet, "WARNING: failed to read status file: "
"%s\n", strerror(-PTR_ERR(past_scrubs)));
close(fdres);
}
/*
* Check for stale information in the status file, ie. if it's
* canceled=0, finished=0 but no scrub is running.
*/
if (!is_scrub_running_in_kernel(fdmnt, di_args, fi_args.num_devices))
force = 1;
/*
* check whether any involved device is already busy running a
* scrub. This would cause damaged status messages and the state
* "aborted" without the explanation that a scrub was already
* running. Therefore check it first, prevent it and give some
* feedback to the user if scrub is already running.
* Note that if scrub is started with a block device as the
* parameter, only that particular block device is checked. It
* is a normal mode of operation to start scrub on multiple
* single devices, there is no reason to prevent this.
*/
if (!force && is_scrub_running_on_fs(&fi_args, di_args, past_scrubs)) {
ERR(!do_quiet,
"ERROR: scrub is already running.\n"
"To cancel use 'btrfs scrub cancel %s'.\n"
"To see the status use 'btrfs scrub status [-d] %s'.\n",
path, path);
err = 1;
goto out;
}
t_devs = malloc(fi_args.num_devices * sizeof(*t_devs));
sp = calloc(fi_args.num_devices, sizeof(*sp));
spc.progress = calloc(fi_args.num_devices * 2, sizeof(*spc.progress));
if (!t_devs || !sp || !spc.progress) {
ERR(!do_quiet, "ERROR: scrub failed: %s", strerror(errno));
err = 1;
goto out;
}
for (i = 0; i < fi_args.num_devices; ++i) {
devid = di_args[i].devid;
ret = pthread_mutex_init(&sp[i].progress_mutex, NULL);
if (ret) {
ERR(!do_quiet, "ERROR: pthread_mutex_init failed: "
"%s\n", strerror(ret));
err = 1;
goto out;
}
last_scrub = last_dev_scrub(past_scrubs, devid);
sp[i].scrub_args.devid = devid;
sp[i].fd = fdmnt;
if (resume && last_scrub && (last_scrub->stats.canceled ||
!last_scrub->stats.finished)) {
++n_resume;
sp[i].scrub_args.start = last_scrub->p.last_physical;
sp[i].resumed = last_scrub;
} else if (resume) {
++n_skip;
sp[i].skip = 1;
sp[i].resumed = last_scrub;
continue;
} else {
++n_start;
sp[i].scrub_args.start = 0ll;
sp[i].resumed = NULL;
}
sp[i].skip = 0;
sp[i].scrub_args.end = (u64)-1ll;
sp[i].scrub_args.flags = readonly ? BTRFS_SCRUB_READONLY : 0;
sp[i].ioprio_class = ioprio_class;
sp[i].ioprio_classdata = ioprio_classdata;
}
if (!n_start && !n_resume) {
if (!do_quiet)
printf("scrub: nothing to resume for %s, fsid %s\n",
path, fsid);
nothing_to_resume = 1;
goto out;
}
ret = prg_fd = socket(AF_UNIX, SOCK_STREAM, 0);
while (ret != -1) {
ret = scrub_datafile(SCRUB_PROGRESS_SOCKET_PATH, fsid, NULL,
sock_path, sizeof(sock_path));
/* ignore EOVERFLOW, try using a shorter path for the socket */
addr.sun_path[sizeof(addr.sun_path) - 1] = '\0';
strncpy(addr.sun_path, sock_path, sizeof(addr.sun_path) - 1);
ret = bind(prg_fd, (struct sockaddr *)&addr, sizeof(addr));
if (ret != -1 || errno != EADDRINUSE)
break;
/*
* bind failed with EADDRINUSE. so let's see if anyone answers
* when we make a call to the socket ...
*/
ret = connect(prg_fd, (struct sockaddr *)&addr, sizeof(addr));
if (!ret || errno != ECONNREFUSED) {
/* ... yes, so scrub must be running. error out */
fprintf(stderr, "ERROR: scrub already running\n");
close(prg_fd);
prg_fd = -1;
goto out;
}
/*
* ... no, this means someone left us alone with an unused
* socket in the file system. remove it and try again.
*/
ret = unlink(sock_path);
}
if (ret != -1)
ret = listen(prg_fd, 100);
if (ret == -1) {
ERR(!do_quiet, "WARNING: failed to open the progress status "
"socket at %s: %s. Progress cannot be queried\n",
sock_path[0] ? sock_path : SCRUB_PROGRESS_SOCKET_PATH,
strerror(errno));
if (prg_fd != -1) {
close(prg_fd);
prg_fd = -1;
if (sock_path[0])
unlink(sock_path);
}
}
if (do_record) {
/* write all-zero progress file for a start */
ret = scrub_write_progress(&spc_write_mutex, fsid, sp,
fi_args.num_devices);
if (ret) {
ERR(!do_quiet, "WARNING: failed to write the progress "
"status file: %s. Status recording disabled\n",
strerror(-ret));
do_record = 0;
}
}
if (do_background) {
pid = fork();
if (pid == -1) {
ERR(!do_quiet, "ERROR: cannot scrub, fork failed: "
"%s\n", strerror(errno));
err = 1;
goto out;
}
if (pid) {
int stat;
scrub_handle_sigint_parent();
if (!do_quiet)
printf("scrub %s on %s, fsid %s (pid=%d)\n",
n_start ? "started" : "resumed",
path, fsid, pid);
if (!do_wait) {
err = 0;
goto out;
}
ret = wait(&stat);
if (ret != pid) {
ERR(!do_quiet, "ERROR: wait failed: (ret=%d) "
"%s\n", ret, strerror(errno));
err = 1;
goto out;
}
if (!WIFEXITED(stat) || WEXITSTATUS(stat)) {
ERR(!do_quiet, "ERROR: scrub process failed\n");
err = WIFEXITED(stat) ? WEXITSTATUS(stat) : -1;
goto out;
}
err = 0;
goto out;
}
}
scrub_handle_sigint_child(fdmnt);
for (i = 0; i < fi_args.num_devices; ++i) {
if (sp[i].skip) {
sp[i].scrub_args.progress = sp[i].resumed->p;
sp[i].stats = sp[i].resumed->stats;
sp[i].ret = 0;
sp[i].stats.finished = 1;
continue;
}
devid = di_args[i].devid;
gettimeofday(&tv, NULL);
sp[i].stats.t_start = tv.tv_sec;
ret = pthread_create(&t_devs[i], NULL,
scrub_one_dev, &sp[i]);
if (ret) {
if (do_print)
fprintf(stderr, "ERROR: creating "
"scrub_one_dev[%llu] thread failed: "
"%s\n", devid, strerror(ret));
err = 1;
goto out;
}
}
spc.fdmnt = fdmnt;
spc.prg_fd = prg_fd;
spc.do_record = do_record;
spc.write_mutex = &spc_write_mutex;
spc.shared_progress = sp;
spc.fi = &fi_args;
ret = pthread_create(&t_prog, NULL, scrub_progress_cycle, &spc);
if (ret) {
if (do_print)
fprintf(stderr, "ERROR: creating progress thread "
"failed: %s\n", strerror(ret));
err = 1;
goto out;
}
err = 0;
for (i = 0; i < fi_args.num_devices; ++i) {
if (sp[i].skip)
continue;
devid = di_args[i].devid;
ret = pthread_join(t_devs[i], NULL);
if (ret) {
if (do_print)
fprintf(stderr, "ERROR: pthread_join failed "
"for scrub_one_dev[%llu]: %s\n", devid,
strerror(ret));
++err;
continue;
}
if (sp[i].ret && sp[i].ioctl_errno == ENODEV) {
if (do_print)
fprintf(stderr, "WARNING: device %lld not "
"present\n", devid);
continue;
}
if (sp[i].ret && sp[i].ioctl_errno == ECANCELED) {
++err;
} else if (sp[i].ret) {
if (do_print)
fprintf(stderr, "ERROR: scrubbing %s failed "
"for device id %lld (%s)\n", path,
devid, strerror(sp[i].ioctl_errno));
++err;
continue;
}
if (sp[i].scrub_args.progress.uncorrectable_errors > 0)
e_uncorrectable++;
if (sp[i].scrub_args.progress.corrected_errors > 0
|| sp[i].scrub_args.progress.unverified_errors > 0)
e_correctable++;
}
if (do_print) {
const char *append = "done";
if (!do_stats_per_dev)
init_fs_stat(&fs_stat);
for (i = 0; i < fi_args.num_devices; ++i) {
if (do_stats_per_dev) {
print_scrub_dev(&di_args[i],
&sp[i].scrub_args.progress,
print_raw,
sp[i].ret ? "canceled" : "done",
&sp[i].stats);
} else {
if (sp[i].ret)
append = "canceled";
add_to_fs_stat(&sp[i].scrub_args.progress,
&sp[i].stats, &fs_stat);
}
}
if (!do_stats_per_dev) {
printf("scrub %s for %s\n", append, fsid);
print_fs_stat(&fs_stat, print_raw);
}
}
ret = pthread_cancel(t_prog);
if (!ret)
ret = pthread_join(t_prog, &terr);
/* check for errors from the handling of the progress thread */
if (do_print && ret) {
fprintf(stderr, "ERROR: progress thread handling failed: %s\n",
strerror(ret));
}
/* check for errors returned from the progress thread itself */
if (do_print && terr && terr != PTHREAD_CANCELED) {
fprintf(stderr, "ERROR: recording progress "
"failed: %s\n", strerror(-PTR_ERR(terr)));
}
if (do_record) {
ret = scrub_write_progress(&spc_write_mutex, fsid, sp,
fi_args.num_devices);
if (ret && do_print) {
fprintf(stderr, "ERROR: failed to record the result: "
"%s\n", strerror(-ret));
}
}
scrub_handle_sigint_child(-1);
out:
free_history(past_scrubs);
free(di_args);
free(t_devs);
free(sp);
free(spc.progress);
if (prg_fd > -1) {
close(prg_fd);
if (sock_path[0])
unlink(sock_path);
}
close_file_or_dir(fdmnt, dirstream);
if (err)
return 1;
if (nothing_to_resume)
return 2;
if (e_uncorrectable) {
ERR(!do_quiet, "ERROR: There are uncorrectable errors.\n");
return 3;
}
if (e_correctable)
ERR(!do_quiet, "WARNING: errors detected during scrubbing, corrected.\n");
return 0;
}
static const char * const cmd_scrub_start_usage[] = {
"btrfs scrub start [-BdqrRf] [-c ioprio_class -n ioprio_classdata] <path>|<device>",
"Start a new scrub. If a scrub is already running, the new one fails.",
"",
"-B do not background",
"-d stats per device (-B only)",
"-q be quiet",
"-r read only mode",
"-R raw print mode, print full data instead of summary",
"-c set ioprio class (see ionice(1) manpage)",
"-n set ioprio classdata (see ionice(1) manpage)",
"-f force starting new scrub even if a scrub is already running",
" this is useful when scrub stats record file is damaged",
NULL
};
static int cmd_scrub_start(int argc, char **argv)
{
return scrub_start(argc, argv, 0);
}
static const char * const cmd_scrub_cancel_usage[] = {
"btrfs scrub cancel <path>|<device>",
"Cancel a running scrub",
NULL
};
static int cmd_scrub_cancel(int argc, char **argv)
{
char *path;
int ret;
int fdmnt = -1;
DIR *dirstream = NULL;
if (check_argc_exact(argc, 2))
usage(cmd_scrub_cancel_usage);
path = argv[1];
fdmnt = open_path_or_dev_mnt(path, &dirstream);
if (fdmnt < 0) {
if (errno == EINVAL)
fprintf(stderr,
"ERROR: '%s' is not a mounted btrfs device\n",
path);
else
fprintf(stderr, "ERROR: can't access '%s': %s\n",
path, strerror(errno));
ret = 1;
goto out;
}
ret = ioctl(fdmnt, BTRFS_IOC_SCRUB_CANCEL, NULL);
if (ret < 0) {
fprintf(stderr, "ERROR: scrub cancel failed on %s: %s\n", path,
errno == ENOTCONN ? "not running" : strerror(errno));
if (errno == ENOTCONN)
ret = 2;
else
ret = 1;
goto out;
}
ret = 0;
printf("scrub cancelled\n");
out:
close_file_or_dir(fdmnt, dirstream);
return ret;
}
static const char * const cmd_scrub_resume_usage[] = {
"btrfs scrub resume [-BdqrR] [-c ioprio_class -n ioprio_classdata] <path>|<device>",
"Resume previously canceled or interrupted scrub",
"",
"-B do not background",
"-d stats per device (-B only)",
"-q be quiet",
"-r read only mode",
"-R raw print mode, print full data instead of summary",
"-c set ioprio class (see ionice(1) manpage)",
"-n set ioprio classdata (see ionice(1) manpage)",
NULL
};
static int cmd_scrub_resume(int argc, char **argv)
{
return scrub_start(argc, argv, 1);
}
static const char * const cmd_scrub_status_usage[] = {
"btrfs scrub status [-dR] <path>|<device>",
"Show status of running or finished scrub",
"",
"-d stats per device",
"-R print raw stats",
NULL
};
static int cmd_scrub_status(int argc, char **argv)
{
char *path;
struct btrfs_ioctl_fs_info_args fi_args;
struct btrfs_ioctl_dev_info_args *di_args = NULL;
struct scrub_file_record **past_scrubs = NULL;
struct scrub_file_record *last_scrub;
struct scrub_fs_stat fs_stat;
struct sockaddr_un addr = {
.sun_family = AF_UNIX,
};
int in_progress;
int ret;
int i;
int fdmnt;
int print_raw = 0;
int do_stats_per_dev = 0;
int c;
char fsid[BTRFS_UUID_UNPARSED_SIZE];
int fdres = -1;
int err = 0;
DIR *dirstream = NULL;
optind = 1;
while ((c = getopt(argc, argv, "dR")) != -1) {
switch (c) {
case 'd':
do_stats_per_dev = 1;
break;
case 'R':
print_raw = 1;
break;
case '?':
default:
usage(cmd_scrub_status_usage);
}
}
if (check_argc_exact(argc - optind, 1))
usage(cmd_scrub_status_usage);
path = argv[optind];
fdmnt = open_path_or_dev_mnt(path, &dirstream);
if (fdmnt < 0) {
if (errno == EINVAL)
fprintf(stderr,
"ERROR: '%s' is not a mounted btrfs device\n",
path);
else
fprintf(stderr, "ERROR: can't access '%s': %s\n",
path, strerror(errno));
return 1;
}
ret = get_fs_info(path, &fi_args, &di_args);
if (ret) {
fprintf(stderr, "ERROR: getting dev info for scrub failed: "
"%s\n", strerror(-ret));
err = 1;
goto out;
}
if (!fi_args.num_devices) {
fprintf(stderr, "ERROR: no devices found\n");
err = 1;
goto out;
}
uuid_unparse(fi_args.fsid, fsid);
fdres = socket(AF_UNIX, SOCK_STREAM, 0);
if (fdres == -1) {
fprintf(stderr, "ERROR: failed to create socket to "
"receive progress information: %s\n",
strerror(errno));
err = 1;
goto out;
}
scrub_datafile(SCRUB_PROGRESS_SOCKET_PATH, fsid,
NULL, addr.sun_path, sizeof(addr.sun_path));
/* ignore EOVERFLOW, just use shorter name and hope for the best */
addr.sun_path[sizeof(addr.sun_path) - 1] = '\0';
ret = connect(fdres, (struct sockaddr *)&addr, sizeof(addr));
if (ret == -1) {
close(fdres);
fdres = scrub_open_file_r(SCRUB_DATA_FILE, fsid);
if (fdres < 0 && fdres != -ENOENT) {
fprintf(stderr, "WARNING: failed to open status file: "
"%s\n", strerror(-fdres));
err = 1;
goto out;
}
}
if (fdres >= 0) {
past_scrubs = scrub_read_file(fdres, 1);
if (IS_ERR(past_scrubs))
fprintf(stderr, "WARNING: failed to read status: %s\n",
strerror(-PTR_ERR(past_scrubs)));
}
in_progress = is_scrub_running_in_kernel(fdmnt, di_args, fi_args.num_devices);
printf("scrub status for %s\n", fsid);
if (do_stats_per_dev) {
for (i = 0; i < fi_args.num_devices; ++i) {
last_scrub = last_dev_scrub(past_scrubs,
di_args[i].devid);
if (!last_scrub) {
print_scrub_dev(&di_args[i], NULL, print_raw,
NULL, NULL);
continue;
}
last_scrub->stats.in_progress = in_progress;
print_scrub_dev(&di_args[i], &last_scrub->p, print_raw,
last_scrub->stats.finished ?
"history" : "status",
&last_scrub->stats);
}
} else {
init_fs_stat(&fs_stat);
fs_stat.s.in_progress = in_progress;
for (i = 0; i < fi_args.num_devices; ++i) {
last_scrub = last_dev_scrub(past_scrubs,
di_args[i].devid);
if (!last_scrub)
continue;
add_to_fs_stat(&last_scrub->p, &last_scrub->stats,
&fs_stat);
}
print_fs_stat(&fs_stat, print_raw);
}
out:
free_history(past_scrubs);
free(di_args);
if (fdres > -1)
close(fdres);
close_file_or_dir(fdmnt, dirstream);
return !!err;
}
const struct cmd_group scrub_cmd_group = {
scrub_cmd_group_usage, NULL, {
{ "start", cmd_scrub_start, cmd_scrub_start_usage, NULL, 0 },
{ "cancel", cmd_scrub_cancel, cmd_scrub_cancel_usage, NULL, 0 },
{ "resume", cmd_scrub_resume, cmd_scrub_resume_usage, NULL, 0 },
{ "status", cmd_scrub_status, cmd_scrub_status_usage, NULL, 0 },
NULL_CMD_STRUCT
}
};
int cmd_scrub(int argc, char **argv)
{
return handle_command_group(&scrub_cmd_group, argc, argv);
}
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