diff options
Diffstat (limited to 'btrfsctl.c')
| -rw-r--r-- | btrfsctl.c | 17 |
1 files changed, 17 insertions, 0 deletions
@@ -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) { |