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Btrfs-progs: add option to skip whether a scrub has started/resumed in userspace 

I hit a problem that i can not start scrub when i am trying to track
superblock generation mismatch problems.

The fact is that we are trying to check whether we have started a scrub operation
in userspace, this will make us can't start scrub if that record file is damaged
itself. By adding a option to skip that check, everything will be fine.

Signed-off-by: Wang Shilong <wangsl.fnst@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <clm@fb.com>
master
Wang Shilong 2013-12-02 14:42:25 +08:00 committed by Chris Mason
parent b94a3003ae
commit f8675eb30f
2 changed files with 13 additions and 4 deletions
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12
cmds-scrub.c
View File

@ -1096,9 +1096,10 @@ static int scrub_start(int argc, char **argv, int resume)
void *terr;
u64 devid;
DIR *dirstream = NULL;
int force = 0;
optind = 1;
while ((c = getopt(argc, argv, "BdqrRc:n:")) != -1) {
while ((c = getopt(argc, argv, "BdqrRc:n:f")) != -1) {
switch (c) {
case 'B':
do_background = 0;
@ -1123,6 +1124,9 @@ static int scrub_start(int argc, char **argv, int resume)
case 'n':
ioprio_classdata = (int)strtol(optarg, NULL, 10);
break;
case 'f':
force = 1;
break;
case '?':
default:
usage(resume ? cmd_scrub_resume_usage :
@ -1195,7 +1199,7 @@ static int scrub_start(int argc, char **argv, int resume)
* is a normal mode of operation to start scrub on multiple
* single devices, there is no reason to prevent this.
*/
if (is_scrub_running_on_fs(&fi_args, di_args, past_scrubs)) {
if (!force && is_scrub_running_on_fs(&fi_args, di_args, past_scrubs)) {
ERR(!do_quiet,
"ERROR: scrub is already running.\n"
"To cancel use 'btrfs scrub cancel %s'.\n"
@ -1507,7 +1511,7 @@ out:
}
static const char * const cmd_scrub_start_usage[] = {
"btrfs scrub start [-BdqrR] [-c ioprio_class -n ioprio_classdata] <path>|<device>",
"btrfs scrub start [-BdqrRf] [-c ioprio_class -n ioprio_classdata] <path>|<device>",
"Start a new scrub",
"",
"-B do not background",
@ -1517,6 +1521,8 @@ static const char * const cmd_scrub_start_usage[] = {
"-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 to skip checking whether scrub has started/resumed in userspace ",
" this is useful when scrub stats record file is damaged",
NULL
};

5
man/btrfs.8.in
View File

@ -58,7 +58,7 @@ btrfs \- control a btrfs filesystem
\fBbtrfs\fP \fBdevice stats\fP [-z] {\fI<path>\fP|\fI<device>\fP}
.PP
.PP
\fBbtrfs\fP \fBscrub start\fP [-BdqrR] [-c \fIioprio_class\fP -n \fIioprio_classdata\fP] {\fI<path>\fP|\fI<device>\fP}
\fBbtrfs\fP \fBscrub start\fP [-BdqrRf] [-c \fIioprio_class\fP -n \fIioprio_classdata\fP] {\fI<path>\fP|\fI<device>\fP}
.PP
\fBbtrfs\fP \fBscrub cancel\fP {\fI<path>\fP|\fI<device>\fP}
.PP
@ -461,6 +461,9 @@ manpage).
Set IO priority classdata (see
.BR ionice (1)
manpage).
.IP "\fB-f\fP" 5
force to check whether scrub has started or resumed in userspace.
this is useful when scrub stat record file is damaged.
.RE
.TP