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Btrfs-progs: add command to set default subvol 

This introduces a new btrfsctl option, -m, to allow you to set the default'ly
mounted subvolume.  You can do

btrfsctl -m /your/subvolume

and that will make that subvolume the subvolume that is mounted by default, or
you can do

btrfsctl -m <treeid> /any/subvolume

and this will make the subvolume with tree id <treeid> the default'ly mounted
subvolume.  You can get the treeid by using the listing option.  Thanks,

Signed-off-by: Josef Bacik <josef@redhat.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
master
Josef Bacik 2009-12-11 21:12:07 +00:00 committed by Chris Mason
parent 4ff9e2af17
commit 7b14bc0f4f
2 changed files with 18 additions and 0 deletions
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17
btrfsctl.c
View File

@ -29,6 +29,7 @@
#include <unistd.h>
#include <dirent.h>
#include <libgen.h>
#include <stdlib.h>
#include "kerncompat.h"
#include "ctree.h"
#include "transaction.h"
@ -56,6 +57,8 @@ static void print_usage(void)
printf("\t-a: scans all devices for Btrfs filesystems\n");
printf("\t-c: forces a single FS sync\n");
printf("\t-D: delete snapshot\n");
printf("\t-m [tree id] directory: set the default mounted subvolume"
" to the [tree id] or the directory\n");
printf("%s\n", BTRFS_BUILD_VERSION);
exit(1);
}
@ -101,6 +104,7 @@ int main(int ac, char **av)
unsigned long command = 0;
int len;
char *fullpath;
u64 objectid = 0;
if (ac == 2 && strcmp(av[1], "-a") == 0) {
fprintf(stderr, "Scanning for Btrfs filesystems\n");
@ -191,6 +195,16 @@ int main(int ac, char **av)
command = BTRFS_IOC_RESIZE;
} else if (strcmp(av[i], "-c") == 0) {
command = BTRFS_IOC_SYNC;
} else if (strcmp(av[i], "-m") == 0) {
command = BTRFS_IOC_DEFAULT_SUBVOL;
if (i == ac - 3) {
objectid = (unsigned long long)
strtoll(av[i + 1], NULL, 0);
if (errno == ERANGE) {
fprintf(stderr, "invalid tree id\n");
exit(1);
}
}
}
}
if (command == 0) {
@ -219,6 +233,9 @@ int main(int ac, char **av)
if (command == BTRFS_IOC_SNAP_CREATE) {
args.fd = fd;
ret = ioctl(snap_fd, command, &args);
} else if (command == BTRFS_IOC_DEFAULT_SUBVOL) {
printf("objectid is %llu\n", objectid);
ret = ioctl(fd, command, &objectid);
} else
ret = ioctl(fd, command, &args);
if (ret < 0) {

1
ioctl.h
View File

@ -126,4 +126,5 @@ struct btrfs_ioctl_ino_lookup_args {
struct btrfs_ioctl_search_args)
#define BTRFS_IOC_INO_LOOKUP _IOWR(BTRFS_IOCTL_MAGIC, 18, \
struct btrfs_ioctl_ino_lookup_args)
#define BTRFS_IOC_DEFAULT_SUBVOL _IOW(BTRFS_IOCTL_MAGIC, 19, u64)
#endif