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btrfs-progs: device add should check existing FS before adding 

as of now, when 'btrfs device add' adds a device it doesn't
check if the given device contains an existing FS. This
patch will change that to check the same. which when true
add will fail, and ask user to use -f option to overwrite.

further, since now we have test_dev_for_mkfs() function
to check if a disk can be used, so this patch will also
use this function to test the given device before adding.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
master
Anand Jain 2013-09-28 01:30:05 +08:00 committed by Chris Mason
parent c31c50f330
commit 1fdf85a3a3
2 changed files with 15 additions and 27 deletions
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36
cmds-device.c
View File

@ -40,6 +40,7 @@ static const char * const cmd_add_dev_usage[] = {
"btrfs device add [options] <device> [<device>...] <path>",
"Add a device to a filesystem",
"-K|--nodiscard do not perform whole device TRIM",
"-f|--force force overwrite existing filesystem on the disk",
NULL
};
@ -49,14 +50,17 @@ static int cmd_add_dev(int argc, char **argv)
int i, fdmnt, ret=0, e;
DIR *dirstream = NULL;
int discard = 1;
int force = 0;
char estr[100];
while (1) {
int long_index;
static struct option long_options[] = {
{ "nodiscard", optional_argument, NULL, 'K'},
{ "force", no_argument, NULL, 'f'},
{ 0, 0, 0, 0 }
};
int c = getopt_long(argc, argv, "K", long_options,
int c = getopt_long(argc, argv, "Kf", long_options,
&long_index);
if (c < 0)
break;
@ -64,6 +68,9 @@ static int cmd_add_dev(int argc, char **argv)
case 'K':
discard = 0;
break;
case 'f':
force = 1;
break;
default:
usage(cmd_add_dev_usage);
}
@ -86,19 +93,11 @@ static int cmd_add_dev(int argc, char **argv)
struct btrfs_ioctl_vol_args ioctl_args;
int devfd, res;
u64 dev_block_count = 0;
struct stat st;
int mixed = 0;
res = check_mounted(argv[i]);
if (res < 0) {
fprintf(stderr, "error checking %s mount status\n",
argv[i]);
ret++;
continue;
}
if (res == 1) {
fprintf(stderr, "%s is mounted\n", argv[i]);
ret++;
res = test_dev_for_mkfs(argv[i], force, estr);
if (res) {
fprintf(stderr, "%s", estr);
continue;
}
@ -108,19 +107,6 @@ static int cmd_add_dev(int argc, char **argv)
ret++;
continue;
}
res = fstat(devfd, &st);
if (res) {
fprintf(stderr, "ERROR: Unable to stat '%s'\n", argv[i]);
close(devfd);
ret++;
continue;
}
if (!S_ISBLK(st.st_mode)) {
fprintf(stderr, "ERROR: '%s' is not a block device\n", argv[i]);
close(devfd);
ret++;
continue;
}
res = btrfs_prepare_device(devfd, argv[i], 1, &dev_block_count,
0, &mixed, discard);

6
man/btrfs.8.in
View File

@ -47,7 +47,7 @@ btrfs \- control a btrfs filesystem
\fBbtrfs\fP \fB[filesystem] balance status\fP [-v] \fI<path>\fP
.PP
.PP
\fBbtrfs\fP \fBdevice add\fP [-K] \fI<device>\fP [\fI<device>...\fP] \fI<path>\fP
\fBbtrfs\fP \fBdevice add\fP [-Kf] \fI<device>\fP [\fI<device>...\fP] \fI<path>\fP
.PP
\fBbtrfs\fP \fBdevice delete\fP \fI<device>\fP [\fI<device>...\fP] \fI<path>\fP
.PP
@ -383,7 +383,7 @@ be verbose
.RE
.TP
\fBdevice add\fR\fI [-K] <dev> \fP[\fI<dev>...\fP] \fI<path>\fR
\fBdevice add\fR\fI [-Kf] <dev> \fP[\fI<dev>...\fP] \fI<path>\fR
Add device(s) to the filesystem identified by \fI<path>\fR.
If applicable, a whole device discard (TRIM) operation is performed.
.RS
@ -391,6 +391,8 @@ If applicable, a whole device discard (TRIM) operation is performed.
\fIOptions\fR
.IP "\fB-K|--nodiscard\fP" 5
do not perform discard by default
.IP "\fB-f|--force\fP" 5
force overwrite of existing filesystem on the given disk(s)
.RE
.TP