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btrfs-progs: add get_fsid_fd() for getting fsid using fd

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Add a function get_fsid_fd() to use an open file fd to get the
fsid of the mounted filesystem.

Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Goldwyn Rodrigues 2020-08-25 10:03:35 -05:00 committed by David Sterba
parent cc2dd28136
commit b79713a33e
2 changed files with 17 additions and 14 deletions

30
common/utils.c
View File

@ -1097,32 +1097,34 @@ out:
return ret;
}
int get_fsid_fd(int fd, u8 *fsid)
{
int ret;
struct btrfs_ioctl_fs_info_args args;
ret = ioctl(fd, BTRFS_IOC_FS_INFO, &args);
if (ret < 0)
return -errno;
memcpy(fsid, args.fsid, BTRFS_FSID_SIZE);
return 0;
}
int get_fsid(const char *path, u8 *fsid, int silent)
{
int ret;
int fd;
struct btrfs_ioctl_fs_info_args args;
fd = open(path, O_RDONLY);
if (fd < 0) {
ret = -errno;
if (!silent)
error("failed to open %s: %m", path);
goto out;
return -errno;
}
ret = ioctl(fd, BTRFS_IOC_FS_INFO, &args);
if (ret < 0) {
ret = -errno;
goto out;
}
ret = get_fsid_fd(fd, fsid);
close(fd);
memcpy(fsid, args.fsid, BTRFS_FSID_SIZE);
ret = 0;
out:
if (fd != -1)
close(fd);
return ret;
}

1
common/utils.h
View File

@ -75,6 +75,7 @@ void close_file_or_dir(int fd, DIR *dirstream);
int get_fs_info(const char *path, struct btrfs_ioctl_fs_info_args *fi_args,
struct btrfs_ioctl_dev_info_args **di_ret);
int get_fsid(const char *path, u8 *fsid, int silent);
int get_fsid_fd(int fd, u8 *fsid);
int get_label(const char *btrfs_dev, char *label);
int set_label(const char *btrfs_dev, const char *label);