Signed-off-by: Hubert Kario <ka...@wit.edu.pl>
---
cmds-device.c | 42 ++++++++++++++++++++++++++++++++++++++++++
man/btrfs.8.in | 7 +++++++
2 files changed, 49 insertions(+)
diff --git a/cmds-device.c b/cmds-device.c
index db625a6..1edb091 100644
--- a/cmds-device.c
+++ b/cmds-device.c
@@ -246,11 +246,53 @@ static int cmd_scan_dev(int argc, char **argv)
return 0;
}
+static const char * const cmd_zero_dev_usage[] = {
+ "btrfs device zero-superblock <device> [<device> ...]",
+ "Remove btrfs filesystem superblock from devices.",
+ "WARNING! This command will make filesystem residing on the devices",
+ "completely unmountable!",
+ NULL
+};
+
+static int cmd_zero_dev(int argc, char **argv)
+{
+ int fd;
+ char *file;
+ int arg_processed;
+ int ret = 0;
+ u64 device_len;
+ int mixed_mode_needed;
+ const int ZERO_END = 1;
+
+ if( argc < 2 ) {
+ usage(cmd_zero_dev_usage);
+ }
+
+ for(arg_processed = 1; arg_processed < argc; arg_processed++) {
+ file = argv[arg_processed];
+
+ fd = open(file, O_RDWR);
+ if (fd < 0) {
+ fprintf(stderr, "Unable to open %s\n", file);
+ ret |= 1;
+ continue;
+ }
+
+ ret |= btrfs_prepare_device(fd, file, ZERO_END, &device_len,
+ &mixed_mode_needed);
+
+ close(fd);
+ }
+
+ return ret;
+}
+
const struct cmd_group device_cmd_group = {
device_cmd_group_usage, NULL, {
{ "add", cmd_add_dev, cmd_add_dev_usage, NULL, 0 },
{ "delete", cmd_rm_dev, cmd_rm_dev_usage, NULL, 0 },
{ "scan", cmd_scan_dev, cmd_scan_dev_usage, NULL, 0 },
+ { "zero-superblock", cmd_zero_dev, cmd_zero_dev_usage, NULL, 0
},
{ 0, 0, 0, 0, 0 }
}
};
diff --git a/man/btrfs.8.in b/man/btrfs.8.in
index be478e0..a840f7e 100644
--- a/man/btrfs.8.in
+++ b/man/btrfs.8.in
@@ -39,6 +39,8 @@ btrfs \- control a btrfs filesystem
.PP
\fBbtrfs\fP \fBdevice delete\fP\fI <device> [<device>...] <path> \fP
.PP
+\fBbtrfs\fP \fBdevice zero-superblock\fP\fI <device> [<device>...] \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}
@@ -230,6 +232,11 @@ Finally, if \fB--all-devices\fP is passed, all the devices
under /dev are
scanned.
.TP
+\fBdevice zero-superblock\fR\fI <dev> [<dev>..]\fR
+The space on the disk where btrfs metadata can reside is overwritten with
+zeros.
+.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
--
1.7.10
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