This is the next patch series for scrub userland tools.
Change log v1->v2:
- commands now reachable as "btrfs scrub ..." instead of "btrfs
filesystem
scrub ..."
- ability to scrub a single device instead of a whole file system
- superfluous command line options removed
- resume is now a separate command ("scrub resume") instead of
"scrub start -r"
- read-only mode (which inherited the -r option immediately, sorry for that)
- up to date progress numbers with "btrfs scrub status" while scrub is
running
- effective locking to protect against multiple scrubs on a filesystem
- man page entry for scrub added
Change log v2->v3:
- unverified_errors counter added
- return code of utility now depends on detected disk errors
- bail out when check_mounted_where returns an error
- changes as suggested by Hugo Mill''s review. incomplete list:
- style (checkpatch is happy now)
- pthread_* error handling
- use /var/lib/btrfs instead of /var/btrfs for storing history
Attention: This version may be useful for Hugo, only. It is meant to be
included in his current integration branch. Also, I wanted to avoid
patching the patches previously sent and rather deliver a fresh
version. Therefore, I used "integration-20110705" from
http://git.darksatanic.net/repo/btrfs-progs-unstable.git/ as a base,
reverted the scrub patches in the middle and built upon that.
-Jan
Jan Schmidt (5):
btrfs-progs: commands added
btrfs-progs: scrub ioctls
btrfs-progs: added check_mounted_where
btrfs-progs: scrub userland implementation
btrfs-progs: scrub added to manpage
Makefile | 4 +-
btrfs.c | 23 +
btrfs_cmds.c | 2 +-
btrfs_cmds.h | 5 +
ctree.h | 2 +-
ioctl.h | 54 ++-
man/btrfs.8.in | 64 +++-
scrub.c | 1666 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
utils.c | 29 +-
utils.h | 2 +
10 files changed, 1838 insertions(+), 13 deletions(-)
create mode 100644 scrub.c
--
1.7.3.4
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- scrub commands added
- open_file_or_dir no longer static (needed by scrub.c)
Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
---
Makefile | 4 ++--
btrfs.c | 23 +++++++++++++++++++++++
btrfs_cmds.c | 2 +-
btrfs_cmds.h | 5 +++++
4 files changed, 31 insertions(+), 3 deletions(-)
diff --git a/Makefile b/Makefile
index 22bae25..edee1a0 100644
--- a/Makefile
+++ b/Makefile
@@ -35,8 +35,8 @@ all: version $(progs) manpages
version:
bash version.sh
-btrfs: $(objects) btrfs.o btrfs_cmds.o
- $(CC) -lpthread $(CFLAGS) -o btrfs btrfs.o btrfs_cmds.o \
+btrfs: $(objects) btrfs.o btrfs_cmds.o scrub.o
+ $(CC) -lpthread $(CFLAGS) -o btrfs btrfs.o btrfs_cmds.o scrub.o \
$(objects) $(LDFLAGS) $(LIBS)
btrfsctl: $(objects) btrfsctl.o
diff --git a/btrfs.c b/btrfs.c
index ee4e756..f494738 100644
--- a/btrfs.c
+++ b/btrfs.c
@@ -142,6 +142,29 @@ static struct Command commands[] = {
"balance cancel", "<path>\n"
"Cancel the balance operation running on <path>."
},
+ { do_scrub_start, -1,
+ "scrub start", "[-Bdqr] <path>|<device>\n"
+ "Start a new scrub.",
+ "\n-B do not background\n"
+ "-d stats per device (-B only)\n"
+ "-q quiet\n"
+ "-r read only mode\n"
+ },
+ { do_scrub_cancel, 1,
+ "scrub cancel", "<path>|<device>\n"
+ "Cancel a running scrub.",
+ NULL
+ },
+ { do_scrub_resume, -1,
+ "scrub resume", "[-Bdqr] <path>|<device>\n"
+ "Resume previously canceled or interrupted scrub.",
+ NULL
+ },
+ { do_scrub_status, -1,
+ "scrub status", "[-d] <path>|<device>\n"
+ "Show status of running or finished scrub.",
+ NULL
+ },
{ do_scan, 999,
"device scan", "[--all-devices|<device> [<device>
...]]\n"
"Scan all device for or the passed device for a btrfs\n"
diff --git a/btrfs_cmds.c b/btrfs_cmds.c
index 43ffc38..0612f34 100644
--- a/btrfs_cmds.c
+++ b/btrfs_cmds.c
@@ -92,7 +92,7 @@ static int test_isdir(char *path)
}
-static int open_file_or_dir(const char *fname)
+int open_file_or_dir(const char *fname)
{
int ret;
struct stat st;
diff --git a/btrfs_cmds.h b/btrfs_cmds.h
index 067b53f..83faa5b 100644
--- a/btrfs_cmds.h
+++ b/btrfs_cmds.h
@@ -23,6 +23,10 @@ int do_defrag(int argc, char **argv);
int do_show_filesystem(int nargs, char **argv);
int do_add_volume(int nargs, char **args);
int do_balance(int nargs, char **argv);
+int do_scrub_start(int nargs, char **argv);
+int do_scrub_status(int argc, char **argv);
+int do_scrub_resume(int argc, char **argv);
+int do_scrub_cancel(int nargs, char **argv);
int do_balance_progress(int nargs, char **argv);
int do_balance_cancel(int nargs, char **argv);
int do_remove_volume(int nargs, char **args);
@@ -35,3 +39,4 @@ int do_df_filesystem(int nargs, char **argv);
int find_updated_files(int fd, u64 root_id, u64 oldest_gen);
int do_find_newer(int argc, char **argv);
int do_change_label(int argc, char **argv);
+int open_file_or_dir(const char *fname);
--
1.7.3.4
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- scrub structs added
- ioctls for scrub
- BTRFS_FSID_SIZE moved
Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
---
ctree.h | 2 +-
ioctl.h | 54 +++++++++++++++++++++++++++++++++++++++++++++++++++++-
2 files changed, 54 insertions(+), 2 deletions(-)
diff --git a/ctree.h b/ctree.h
index 61eb639..6e1b80b 100644
--- a/ctree.h
+++ b/ctree.h
@@ -24,6 +24,7 @@
#include "radix-tree.h"
#include "extent-cache.h"
#include "extent_io.h"
+#include "ioctl.h"
struct btrfs_root;
struct btrfs_trans_handle;
@@ -250,7 +251,6 @@ static inline unsigned long btrfs_chunk_item_size(int
num_stripes)
sizeof(struct btrfs_stripe) * (num_stripes - 1);
}
-#define BTRFS_FSID_SIZE 16
#define BTRFS_HEADER_FLAG_WRITTEN (1ULL << 0)
#define BTRFS_HEADER_FLAG_RELOC (1ULL << 1)
#define BTRFS_SUPER_FLAG_SEEDING (1ULL << 32)
diff --git a/ioctl.h b/ioctl.h
index 7be1177..11730d2 100644
--- a/ioctl.h
+++ b/ioctl.h
@@ -23,8 +23,9 @@
#define BTRFS_IOCTL_MAGIC 0x94
#define BTRFS_VOL_NAME_MAX 255
-#define BTRFS_PATH_NAME_MAX 4087
+/* this should be 4k */
+#define BTRFS_PATH_NAME_MAX 4087
struct btrfs_ioctl_vol_args {
__s64 fd;
char name[BTRFS_PATH_NAME_MAX + 1];
@@ -44,6 +45,52 @@ struct btrfs_ioctl_vol_args_v2 {
#define BTRFS_FSID_SIZE 16
#define BTRFS_UUID_SIZE 16
+struct btrfs_scrub_progress {
+ __u64 data_extents_scrubbed;
+ __u64 tree_extents_scrubbed;
+ __u64 data_bytes_scrubbed;
+ __u64 tree_bytes_scrubbed;
+ __u64 read_errors;
+ __u64 csum_errors;
+ __u64 verify_errors;
+ __u64 no_csum;
+ __u64 csum_discards;
+ __u64 super_errors;
+ __u64 malloc_errors;
+ __u64 uncorrectable_errors;
+ __u64 corrected_errors;
+ __u64 last_physical;
+ __u64 unverified_errors;
+};
+
+#define BTRFS_SCRUB_READONLY 1
+struct btrfs_ioctl_scrub_args {
+ __u64 devid; /* in */
+ __u64 start; /* in */
+ __u64 end; /* in */
+ __u64 flags; /* in */
+ struct btrfs_scrub_progress progress; /* out */
+ /* pad to 1k */
+ __u64 unused[(1024-32-sizeof(struct btrfs_scrub_progress))/8];
+};
+
+#define BTRFS_DEVICE_PATH_NAME_MAX 1024
+struct btrfs_ioctl_dev_info_args {
+ __u64 devid; /* in/out */
+ __u8 uuid[BTRFS_UUID_SIZE]; /* in/out */
+ __u64 bytes_used; /* out */
+ __u64 total_bytes; /* out */
+ __u64 unused[379]; /* pad to 4k */
+ __u8 path[BTRFS_DEVICE_PATH_NAME_MAX]; /* out */
+};
+
+struct btrfs_ioctl_fs_info_args {
+ __u64 max_id; /* out */
+ __u64 num_devices; /* out */
+ __u8 fsid[BTRFS_FSID_SIZE]; /* out */
+ __u64 reserved[124]; /* pad to 1k */
+};
+
struct btrfs_ioctl_search_key {
/* which root are we searching. 0 is the tree of tree roots */
__u64 tree_id;
@@ -234,6 +281,11 @@ struct btrfs_ioctl_balance_start {
struct btrfs_ioctl_space_args)
#define BTRFS_IOC_SNAP_CREATE_V2 _IOW(BTRFS_IOCTL_MAGIC, 23, \
struct btrfs_ioctl_vol_args_v2)
+#define BTRFS_IOC_SCRUB _IOWR(BTRFS_IOCTL_MAGIC, 27, \
+ struct btrfs_ioctl_scrub_args)
+#define BTRFS_IOC_SCRUB_CANCEL _IO(BTRFS_IOCTL_MAGIC, 28)
+#define BTRFS_IOC_SCRUB_PROGRESS _IOWR(BTRFS_IOCTL_MAGIC, 29, \
+ struct btrfs_ioctl_scrub_args)
#define BTRFS_IOC_DEV_INFO _IOWR(BTRFS_IOCTL_MAGIC, 30, \
struct btrfs_ioctl_dev_info_args)
#define BTRFS_IOC_FS_INFO _IOR(BTRFS_IOCTL_MAGIC, 31, \
--
1.7.3.4
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new version of check_mounted() returning more information gathered while
searching. check_mounted() is now a wrapper for check_mounted_where(). the
new version is needed by scrub.c
Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
---
utils.c | 29 ++++++++++++++++++++++-------
utils.h | 2 ++
2 files changed, 24 insertions(+), 7 deletions(-)
diff --git a/utils.c b/utils.c
index 64a4298..86c643c 100644
--- a/utils.c
+++ b/utils.c
@@ -790,13 +790,8 @@ int blk_file_in_dev_list(struct btrfs_fs_devices*
fs_devices, const char* file)
*/
int check_mounted(const char* file)
{
- int ret;
int fd;
- u64 total_devs = 1;
- int is_btrfs;
- struct btrfs_fs_devices* fs_devices_mnt = NULL;
- FILE *f;
- struct mntent *mnt;
+ int ret;
fd = open(file, O_RDONLY);
if (fd < 0) {
@@ -804,11 +799,26 @@ int check_mounted(const char* file)
return -errno;
}
+ ret = check_mounted_where(fd, file, NULL, 0, NULL);
+ close(fd);
+
+ return ret;
+}
+
+int check_mounted_where(int fd, const char *file, char *where, int size,
+ struct btrfs_fs_devices **fs_dev_ret)
+{
+ int ret;
+ u64 total_devs = 1;
+ int is_btrfs;
+ struct btrfs_fs_devices *fs_devices_mnt = NULL;
+ FILE *f;
+ struct mntent *mnt;
+
/* scan the initial device */
ret = btrfs_scan_one_device(fd, file, &fs_devices_mnt,
&total_devs, BTRFS_SUPER_INFO_OFFSET);
is_btrfs = (ret >= 0);
- close(fd);
/* scan other devices */
if (is_btrfs && total_devs > 1) {
@@ -844,6 +854,11 @@ int check_mounted(const char* file)
}
/* Did we find an entry in mnt table? */
+ if (mnt && size && where)
+ strncpy(where, mnt->mnt_dir, size);
+ if (fs_dev_ret)
+ *fs_dev_ret = fs_devices_mnt;
+
ret = (mnt != NULL);
out_mntloop_err:
diff --git a/utils.h b/utils.h
index 0067728..c5f55e1 100644
--- a/utils.h
+++ b/utils.h
@@ -37,6 +37,8 @@ int btrfs_scan_for_fsid(struct btrfs_fs_devices *fs_devices,
u64 total_devs,
void btrfs_register_one_device(char *fname);
int btrfs_scan_one_dir(char *dirname, int run_ioctl);
int check_mounted(const char *devicename);
+int check_mounted_where(int fd, const char *file, char *where, int size,
+ struct btrfs_fs_devices **fs_devices_mnt);
int btrfs_device_already_in_root(struct btrfs_root *root, int fd,
int super_offset);
char *pretty_sizes(u64 size);
--
1.7.3.4
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Jan Schmidt
2011-Jul-18 12:37 UTC
[PATCH v3 4/5] btrfs-progs: scrub userland implementation
Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
---
scrub.c | 1666 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 1666 insertions(+), 0 deletions(-)
diff --git a/scrub.c b/scrub.c
new file mode 100644
index 0000000..9dca5f6
--- /dev/null
+++ b/scrub.c
@@ -0,0 +1,1666 @@
+/*
+ * 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 <sys/ioctl.h>
+#include <sys/wait.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/un.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 "btrfs_cmds.h"
+#include "utils.h"
+#include "volumes.h"
+#include "disk-io.h"
+
+#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;
+};
+
+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;
+};
+
+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;
+ char *bytes;
+
+ 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");
+ bytes = pretty_sizes(p->data_bytes_scrubbed + p->tree_bytes_scrubbed);
+ printf("\ttotal bytes scrubbed: %s with %llu errors\n", bytes,
+ max(err_cnt, err_cnt2));
+ free(bytes);
+ 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 {
+ printf(", running for %llu seconds\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)
+ 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)
+{
+ ioctl(cancel_fd, BTRFS_IOC_SCRUB_CANCEL, NULL);
+}
+
+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;
+
+ if (fd < 0)
+ return ERR_PTR(-EINVAL);
+
+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 != 36)
+ _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 = 0;
+ int old;
+
+ ret = pthread_mutex_lock(m);
+ if (ret) {
+ err = -errno;
+ goto out;
+ }
+
+ ret = pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &old);
+ if (ret) {
+ err = -ret;
+ goto out;
+ }
+
+ fd = scrub_open_file_w(SCRUB_DATA_FILE, fsid, "tmp");
+ if (fd < 0) {
+ err = fd;
+ goto out;
+ }
+ err = scrub_write_file(fd, fsid, data, n);
+ if (err)
+ goto out;
+ err = scrub_rename_file(SCRUB_DATA_FILE, fsid, "tmp");
+ if (err)
+ goto out;
+
+out:
+ if (fd > 0) {
+ ret = close(fd);
+ if (ret)
+ err = -errno;
+ }
+
+ ret = pthread_mutex_unlock(m);
+ if (ret && !err)
+ err = -ret;
+
+ ret = pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, &old);
+ if (ret && !err)
+ err = -ret;
+
+ 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 = 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;
+}
+
+static void *scrub_progress_cycle(void *ctx)
+{
+ int ret;
+ int old;
+ int i;
+ char fsid[37];
+ 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);
+
+ ret = pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, &old);
+ if (ret)
+ return ERR_PTR(-ret);
+
+ 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)
+ return ERR_PTR(-errno);
+ 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)
+ return ERR_PTR(-sp->ioctl_errno);
+ /*
+ * 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.
+ */
+ ret = pthread_mutex_lock(&sp_shared->progress_mutex);
+ if (ret)
+ return ERR_PTR(-ret);
+ if (!sp_shared->stats.finished) {
+ ret = pthread_mutex_unlock(
+ &sp_shared->progress_mutex);
+ if (ret)
+ return ERR_PTR(-ret);
+ memcpy(sp, sp_last, sizeof(*sp));
+ continue;
+ }
+ ret = pthread_mutex_unlock(&sp_shared->progress_mutex);
+ if (ret)
+ return ERR_PTR(-ret);
+ 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)
+ return ERR_PTR(-errno);
+ if (ret) {
+ ret = scrub_write_file(
+ peer_fd, fsid,
+ &spc->progress[this * ndev], ndev);
+ if (ret)
+ return ERR_PTR(ret);
+ }
+ 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)
+ 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 scrub_device_info(int fd, u64 devid,
+ struct btrfs_ioctl_dev_info_args *di_args)
+{
+ int ret;
+
+ di_args->devid = devid;
+ memset(&di_args->uuid, ''\0'',
sizeof(di_args->uuid));
+
+ ret = ioctl(fd, BTRFS_IOC_DEV_INFO, di_args);
+ return ret ? -errno : 0;
+}
+
+static int scrub_fs_info(int fd, char *path,
+ struct btrfs_ioctl_fs_info_args *fi_args,
+ struct btrfs_ioctl_dev_info_args **di_ret)
+{
+ int ret = 0;
+ int ndevs = 0;
+ int i = 1;
+ struct btrfs_fs_devices *fs_devices_mnt = NULL;
+ struct btrfs_ioctl_dev_info_args *di_args;
+ char mp[BTRFS_PATH_NAME_MAX + 1];
+
+ memset(fi_args, 0, sizeof(*fi_args));
+
+ ret = ioctl(fd, BTRFS_IOC_FS_INFO, fi_args);
+ if (ret && errno == EINVAL) {
+ /* path is no mounted btrfs. try if it''s a device */
+ ret = check_mounted_where(fd, path, mp, sizeof(mp),
+ &fs_devices_mnt);
+ if (!ret)
+ return -EINVAL;
+ if (ret < 0)
+ return ret;
+ fi_args->num_devices = 1;
+ fi_args->max_id = fs_devices_mnt->latest_devid;
+ i = fs_devices_mnt->latest_devid;
+ memcpy(fi_args->fsid, fs_devices_mnt->fsid, BTRFS_FSID_SIZE);
+ close(fd);
+ fd = open_file_or_dir(mp);
+ if (fd < 0)
+ return -errno;
+ } else if (ret) {
+ return -errno;
+ }
+
+ if (!fi_args->num_devices)
+ return 0;
+
+ di_args = *di_ret = malloc(fi_args->num_devices * sizeof(*di_args));
+ if (!di_args)
+ return -errno;
+
+ for (; i <= fi_args->max_id; ++i) {
+ BUG_ON(ndevs >= fi_args->num_devices);
+ ret = scrub_device_info(fd, i, &di_args[ndevs]);
+ if (ret == -ENODEV)
+ continue;
+ if (ret)
+ return ret;
+ ++ndevs;
+ }
+
+ BUG_ON(ndevs == 0);
+
+ return 0;
+}
+
+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 1;
+ path[i] = ''/'';
+ }
+
+ return 0;
+}
+
+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 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;
+ pthread_attr_t t_attr;
+ struct scrub_file_record **past_scrubs = NULL;
+ struct scrub_file_record *last_scrub = NULL;
+ char *datafile = strdup(SCRUB_DATA_FILE);
+ char fsid[37];
+ 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;
+
+ optind = 1;
+ while ((c = getopt(argc, argv, "BdqrR")) != -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 ''?'':
+ default:
+ fprintf(stderr, "ERROR: scrub args invalid.\n"
+ " -B do not background\n"
+ " -d stats per device (-B only)\n"
+ " -q quiet\n"
+ " -r read only mode\n");
+ return 1;
+ }
+ }
+
+ /* try to catch most error cases before forking */
+
+ if (optind + 1 != argc) {
+ fprintf(stderr, "ERROR: scrub start needs path as last "
+ "argument\n");
+ return 1;
+ }
+
+ 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_file_or_dir(path);
+ if (fdmnt < 0) {
+ ERR(!do_quiet, "ERROR: can''t access
''%s''\n", path);
+ return 12;
+ }
+
+ ret = scrub_fs_info(fdmnt, 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);
+ }
+
+ 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;
+ }
+
+ ret = pthread_attr_init(&t_attr);
+ if (ret) {
+ ERR(!do_quiet, "ERROR: pthread_attr_init failed: %s\n",
+ strerror(ret));
+ 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;
+ }
+
+ if (!n_start && !n_resume) {
+ if (!do_quiet)
+ printf("scrub: nothing to resume for %s, fsid %s\n",
+ path, fsid);
+ err = 0;
+ 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);
+ 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], &t_attr,
+ 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, &t_attr, 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);
+ if (do_print && ret) {
+ fprintf(stderr, "ERROR: progress thead handling failed: %s\n",
+ strerror(ret));
+ }
+
+ 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(fdmnt);
+
+ if (err)
+ return 1;
+ if (e_correctable)
+ return 7;
+ if (e_uncorrectable)
+ return 8;
+ return 0;
+}
+
+int do_scrub_start(int argc, char **argv)
+{
+ return scrub_start(argc, argv, 0);
+}
+
+int do_scrub_resume(int argc, char **argv)
+{
+ return scrub_start(argc, argv, 1);
+}
+
+int do_scrub_cancel(int argc, char **argv)
+{
+ char *path = argv[1];
+ int ret;
+ int fdmnt;
+ int err;
+ char mp[BTRFS_PATH_NAME_MAX + 1];
+ struct btrfs_fs_devices *fs_devices_mnt = NULL;
+
+ fdmnt = open_file_or_dir(path);
+ if (fdmnt < 0) {
+ fprintf(stderr, "ERROR: scrub cancel failed\n");
+ return 12;
+ }
+
+again:
+ ret = ioctl(fdmnt, BTRFS_IOC_SCRUB_CANCEL, NULL);
+ err = errno;
+ close(fdmnt);
+
+ if (ret && err == EINVAL) {
+ /* path is no mounted btrfs. try if it''s a device */
+ ret = check_mounted_where(fdmnt, path, mp, sizeof(mp),
+ &fs_devices_mnt);
+ close(fdmnt);
+ if (ret) {
+ fdmnt = open_file_or_dir(mp);
+ if (fdmnt >= 0) {
+ path = mp;
+ goto again;
+ }
+ }
+ }
+
+ if (ret) {
+ fprintf(stderr, "ERROR: scrub cancel failed on %s: %s\n", path,
+ err == ENOTCONN ? "not running" : strerror(errno));
+ return 1;
+ }
+
+ printf("scrub cancelled\n");
+
+ return 0;
+}
+
+int do_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 ret;
+ int fdmnt;
+ int i;
+ optind = 1;
+ int print_raw = 0;
+ int do_stats_per_dev = 0;
+ char c;
+ char fsid[37];
+ int fdres = -1;
+ int err = 0;
+
+ 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:
+ fprintf(stderr, "ERROR: scrub status args invalid.\n"
+ " -d stats per device\n");
+ return 1;
+ }
+ }
+
+ if (optind + 1 != argc) {
+ fprintf(stderr, "ERROR: scrub status needs path as last "
+ "argument\n");
+ return 1;
+ }
+
+ path = argv[optind];
+
+ fdmnt = open_file_or_dir(path);
+ if (fdmnt < 0) {
+ fprintf(stderr, "ERROR: can''t access to
''%s''\n", path);
+ return 12;
+ }
+
+ ret = scrub_fs_info(fdmnt, 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) {
+ 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)));
+ }
+
+ 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;
+ }
+ 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);
+ 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);
+ close(fdmnt);
+ if (fdres > -1)
+ close(fdres);
+
+ return err;
+}
--
1.7.3.4
--
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Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
---
man/btrfs.8.in | 64 +++++++++++++++++++++++++++++++++++++++++++++++++++++++-
1 files changed, 63 insertions(+), 1 deletions(-)
diff --git a/man/btrfs.8.in b/man/btrfs.8.in
index e1a6ad9..84a60cd 100644
--- a/man/btrfs.8.in
+++ b/man/btrfs.8.in
@@ -41,7 +41,15 @@ btrfs \- control a btrfs filesystem
.PP
\fBbtrfs\fP \fBdevice add\fP\fI <device> [<device>...] <path>
\fP
.PP
-\fBbtrfs\fP \fBdevice delete\fP\fI <device> [<device>...]
<path> \fP]
+\fBbtrfs\fP \fBdevice delete\fP\fI <device> [<device>...]
<path> \fP
+.PP
+\fBbtrfs\fP \fBscrub start\fP [-Bdqru]
{\fI<path>\fP|\fI<device>\fP}
+.PP
+\fBbtrfs\fP \fBscrub cancel\fP {\fI<path>\fP|\fI<device>\fP}
+.PP
+\fBbtrfs\fP \fBscrub resume\fP [-Bdqru]
{\fI<path>\fP|\fI<device>\fP}
+.PP
+\fBbtrfs\fP \fBscrub status\fP [-d] {\fI<path>\fP|\fI<device>\fP}
.PP
\fBbtrfs\fP \fBhelp|\-\-help|\-h \fP\fI\fP
.PP
@@ -225,6 +233,60 @@ Finally, if \fB--all-devices\fP is passed, all the devices
under /dev are
scanned.
.TP
+\fBscrub start\fP [-Bdqru] {\fI<path>\fP|\fI<device>\fP}
+Start a scrub on all devices of the filesystem identified by \fI<path>\fR
or on
+a single \fI<device>\fR. Without options, scrub is started as a
background
+process. Progress can be obtained with the \fBscrub status\fR command.
Scrubbing
+involves reading all data from all disks and verifying checksums. Errors are
+corrected along the way if possible.
+.RS
+
+\fIOptions\fR
+.IP -B 5
+Do not background and print scrub statistics when finished.
+.IP -d 5
+Print separate statistics for each device of the filesystem (-B only).
+.IP -q 5
+Quiet. Omit error messages and statistics.
+.IP -r 5
+Read only mode. Do not attempt to correct anything.
+.IP -u 5
+Scrub unused space as well. (NOT IMPLEMENTED)
+.RE
+.TP
+
+\fBscrub cancel\fP {\fI<path>\fP|\fI<device>\fP}
+If a scrub is running on the filesystem identified by \fI<path>\fR,
cancel it.
+Progress is saved in the scrub progress file and scrubbing can be resumed later
+using the \fBscrub resume\fR command.
+If a \fI<device>\fR is given, the corresponding filesystem is found and
+\fBscrub cancel\fP behaves as if it was called on that filesystem.
+.TP
+
+\fBscrub resume\fP [-Bdqru] {\fI<path>\fP|\fI<device>\fP}
+Resume a canceled or interrupted scrub cycle on the filesystem identified by
+\fI<path>\fR or on a given \fI<device>\fR. Does not start a new
scrub if the
+last scrub finished successfully.
+.RS
+
+\fIOptions\fR
+.TP
+see \fBscrub start\fP.
+.RE
+.TP
+
+\fBscrub status\fP [-d] {\fI<path>\fP|\fI<device>\fP}
+Show status of a running scrub for the filesystem identified by
\fI<path>\fR or
+for the specified \fI<device>\fR.
+If no scrub is running, show statistics of the last finished or canceled scrub
+for that filesystem or device.
+.RS
+
+\fIOptions\fR
+.IP -d 5
+Print separate statistics for each device of the filesystem.
+.RE
+
.PP
\fBbalance progress\fP [\fB-m\fP|\fB--monitor\fP] \fI<path>\fP
--
1.7.3.4
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