diff options
author | Nicholas D Steeves <nsteeves@gmail.com> | 2016-04-23 00:41:30 +0100 |
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committer | Nicholas D Steeves <nsteeves@gmail.com> | 2016-04-23 00:41:30 +0100 |
commit | cec572daccafa1e912cbed363df6f84687778c6f (patch) | |
tree | 7d99ab9f73d25c1ed8eaf6393f6374edf5316b03 /cmds-scrub.c |
btrfs-progs (4.4.1-1.1) unstable; urgency=medium
* Non-maintainer upload.
* New upstream release.
* Rename package to btrfs-progs (Closes: #780081)
* Update standards version to 3.9.7 (no changes needed).
* debian/control: Add "Breaks" per Gianfranco Costamagna's suggestion
* Change lintian override to reflect package rename
* Switch from using postinst and postrm to using triggers
per Christian Seiler's recommendation.
# imported from the archive
Diffstat (limited to 'cmds-scrub.c')
-rw-r--r-- | cmds-scrub.c | 1803 |
1 files changed, 1803 insertions, 0 deletions
diff --git a/cmds-scrub.c b/cmds-scrub.c new file mode 100644 index 00000000..da614f2f --- /dev/null +++ b/cmds-scrub.c @@ -0,0 +1,1803 @@ +/* + * 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; + } + 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[PATH_MAX] = ""; + 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)) { + warning_on(!do_quiet, + "cannot create scrub data file, mkdir %s failed: %s. Status recording disabled", + datafile, strerror(errno)); + do_record = 0; + } + free(datafile); + + path = argv[optind]; + + fdmnt = open_path_or_dev_mnt(path, &dirstream, !do_quiet); + if (fdmnt < 0) + return 1; + + ret = get_fs_info(path, &fi_args, &di_args); + if (ret) { + error_on(!do_quiet, + "getting dev info for scrub failed: %s", + strerror(-ret)); + err = 1; + goto out; + } + if (!fi_args.num_devices) { + error_on(!do_quiet, "no devices found"); + err = 1; + goto out; + } + + uuid_unparse(fi_args.fsid, fsid); + fdres = scrub_open_file_r(SCRUB_DATA_FILE, fsid); + if (fdres < 0 && fdres != -ENOENT) { + warning_on(!do_quiet, "failed to open status file: %s", + strerror(-fdres)); + } else if (fdres >= 0) { + past_scrubs = scrub_read_file(fdres, !do_quiet); + if (IS_ERR(past_scrubs)) + warning_on(!do_quiet, "failed to read status file: %s", + 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)) { + error_on(!do_quiet, + "Scrub is already running.\n" + "To cancel use 'btrfs scrub cancel %s'.\n" + "To see the status use 'btrfs scrub status [-d] %s'", + 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) { + error_on(!do_quiet, "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) { + error_on(!do_quiet, "pthread_mutex_init failed: %s", + 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 */ + error("scrub already running"); + 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) { + warning_on(!do_quiet, + "failed to open the progress status socket at %s: %s. Progress cannot be queried", + 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) { + warning_on(!do_quiet, + "failed to write the progress status file: %s. Status recording disabled", + strerror(-ret)); + do_record = 0; + } + } + + if (do_background) { + pid = fork(); + if (pid == -1) { + error_on(!do_quiet, "cannot scrub, fork failed: %s", + 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) { + error_on(!do_quiet, "wait failed (ret=%d): %s", + ret, strerror(errno)); + err = 1; + goto out; + } + if (!WIFEXITED(stat) || WEXITSTATUS(stat)) { + error_on(!do_quiet, "scrub process failed"); + 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) + error("creating scrub_one_dev[%llu] thread failed: %s", + 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) + error("creating progress thread failed: %s", + 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) + error("pthread_join failed for scrub_one_dev[%llu]: %s", + devid, strerror(ret)); + ++err; + continue; + } + if (sp[i].ret) { + switch (sp[i].ioctl_errno) { + case ENODEV: + if (do_print) + warning("device %lld not present", + devid); + continue; + case ECANCELED: + ++err; + break; + default: + if (do_print) + error("scrubbing %s failed for device id %lld: ret=%d, errno=%d (%s)", + path, devid, + sp[i].ret, sp[i].ioctl_errno, + 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) { + error("progress thread handling failed: %s", + strerror(ret)); + } + + /* check for errors returned from the progress thread itself */ + if (do_print && terr && terr != PTHREAD_CANCELED) + error("recording progress failed: %s", + strerror(-PTR_ERR(terr))); + + if (do_record) { + ret = scrub_write_progress(&spc_write_mutex, fsid, sp, + fi_args.num_devices); + if (ret && do_print) + error("failed to record the result: %s", + 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) { + error_on(!do_quiet, "there are uncorrectable errors"); + return 3; + } + if (e_correctable) + warning_on(!do_quiet, + "errors detected during scrubbing, corrected"); + + 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, 1); + if (fdmnt < 0) { + ret = 1; + goto out; + } + + ret = ioctl(fdmnt, BTRFS_IOC_SCRUB_CANCEL, NULL); + + if (ret < 0) { + error("scrub cancel failed on %s: %s", 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, 1); + if (fdmnt < 0) + return 1; + + ret = get_fs_info(path, &fi_args, &di_args); + if (ret) { + error("getting dev info for scrub failed: %s", + strerror(-ret)); + err = 1; + goto out; + } + if (!fi_args.num_devices) { + error("no devices found"); + err = 1; + goto out; + } + + uuid_unparse(fi_args.fsid, fsid); + + fdres = socket(AF_UNIX, SOCK_STREAM, 0); + if (fdres == -1) { + error("failed to create socket to receive progress information: %s", + 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) { + warning("failed to open status file: %s", + strerror(-fdres)); + err = 1; + goto out; + } + } + + if (fdres >= 0) { + past_scrubs = scrub_read_file(fdres, 1); + if (IS_ERR(past_scrubs)) + warning("failed to read status: %s", + 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; +} + +static const char scrub_cmd_group_info[] = +"verify checksums of data and metadata"; + +const struct cmd_group scrub_cmd_group = { + scrub_cmd_group_usage, scrub_cmd_group_info, { + { "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); +} |