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cmds-scrub.c
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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 "androidcompat.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 <limits.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 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;
time_t seconds;
unsigned hours;
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);
}
seconds = ss->duration;
hours = ss->duration / (60 * 60);
gmtime_r(&seconds, &tm);
strftime(t, sizeof(t), "%M:%S", &tm);
if (ss->in_progress)
printf(", running for %02u:%s\n", hours, t);
else if (ss->canceled)
printf(" and was aborted after %02u:%s\n", hours, t);
else if (ss->finished)
printf(" and finished after %02u:%s\n", hours, t);
else
printf(", interrupted after %02u:%s, not running\n",
hours, t);
}
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[PATH_MAX];
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[PATH_MAX];
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[PATH_MAX];
char datafile_new[PATH_MAX];
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) \
warning("invalid data on line %d pos " \
"%d state %d (near \"%.*s\") at %s:%d", \
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) {
free_history(p);
return ERR_PTR(-errno);
}
avail += old_avail;
i = 0;
while (i < avail) {
void *tmp;
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;
tmp = p;
p = realloc(p, (curr + 2) * sizeof(*p));
if (!p) {
free_history(tmp);
return ERR_PTR(-errno);
}
p[curr] = malloc(sizeof(**p));
if (!p[curr]) {
free_history(p);
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)
warning("setting ioprio failed: %s (ignored)",
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;