Again this is just a proof of concept, though it does work in the basic case of
just
btrfsctl -m /mnt/point
I'd just like to make sure this is an acceptable approach. Thanks,
Signed-off-by: Josef Bacik <josef@xxxxxxxxxx>
---
btrfsctl.c | 7 +++++++
ioctl.h | 2 ++
2 files changed, 9 insertions(+), 0 deletions(-)
diff --git a/btrfsctl.c b/btrfsctl.c
index 064c0d0..8fc78ba 100644
--- a/btrfsctl.c
+++ b/btrfsctl.c
@@ -58,6 +58,8 @@ static void print_usage(void)
printf("\t-c: forces a single FS sync\n");
printf("\t-D: delete snapshot\n");
printf("\t-l file: listing snapshot/subvolume under a subvolume\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);
}
@@ -266,6 +268,7 @@ 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");
@@ -380,6 +383,8 @@ int main(int ac, char **av)
exit(1);
}
command = BTRFS_IOC_SNAP_LISTING;
+ } else if (strcmp(av[1], "-m") == 0) {
+ command = BTRFS_IOC_DEFAULT_SUBVOL;
}
}
if (command == 0) {
@@ -410,6 +415,8 @@ int main(int ac, char **av)
ret = ioctl(snap_fd, command, &args);
} else if (command == BTRFS_IOC_SNAP_LISTING) {
ret = btrfs_list_subvolumes(snap_fd, command);
+ } else if (command == BTRFS_IOC_DEFAULT_SUBVOL) {
+ ret = ioctl(fd, command, &objectid);
} else
ret = ioctl(fd, command, &args);
if (ret < 0) {
diff --git a/ioctl.h b/ioctl.h
index 19020cb..70fc15d 100644
--- a/ioctl.h
+++ b/ioctl.h
@@ -91,4 +91,6 @@ struct btrfs_ioctl_subvol_leaf {
struct btrfs_ioctl_vol_args)
#define BTRFS_IOC_SNAP_LISTING _IOWR(BTRFS_IOCTL_MAGIC, 16, \
struct btrfs_ioctl_subvol_args)
+#define BTRFS_IOC_DEFAULT_SUBVOL _IOW(BTRFS_IOCTL_MAGIC, 17, u64)
+
#endif
--
1.5.4.3
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