+/* ioctl interface: */
+
+int bcachectl_open(void);
+
+struct bchfs_handle {
+ __uuid_t uuid;
+ int ioctl_fd;
+ int sysfs_fd;
+};
+
+void bcache_fs_close(struct bchfs_handle);
+struct bchfs_handle bcache_fs_open(const char *);
+struct bchfs_handle bchu_fs_open_by_dev(const char *, int *);
+int bchu_dev_path_to_idx(struct bchfs_handle, const char *);
+
+static inline void bchu_disk_add(struct bchfs_handle fs, char *dev)
+{
+ struct bch_ioctl_disk i = { .dev = (unsigned long) dev, };
+
+ xioctl(fs.ioctl_fd, BCH_IOCTL_DISK_ADD, &i);
+}
+
+static inline void bchu_disk_remove(struct bchfs_handle fs, unsigned dev_idx,
+ unsigned flags)
+{
+ struct bch_ioctl_disk i = {
+ .flags = flags|BCH_BY_INDEX,
+ .dev = dev_idx,
+ };
+
+ xioctl(fs.ioctl_fd, BCH_IOCTL_DISK_REMOVE, &i);
+}
+
+static inline void bchu_disk_online(struct bchfs_handle fs, char *dev)
+{
+ struct bch_ioctl_disk i = { .dev = (unsigned long) dev, };
+
+ xioctl(fs.ioctl_fd, BCH_IOCTL_DISK_ONLINE, &i);
+}
+
+static inline void bchu_disk_offline(struct bchfs_handle fs, unsigned dev_idx,
+ unsigned flags)
+{
+ struct bch_ioctl_disk i = {
+ .flags = flags|BCH_BY_INDEX,
+ .dev = dev_idx,
+ };
+
+ xioctl(fs.ioctl_fd, BCH_IOCTL_DISK_OFFLINE, &i);
+}
+
+static inline void bchu_disk_set_state(struct bchfs_handle fs, unsigned dev,
+ unsigned new_state, unsigned flags)
+{
+ struct bch_ioctl_disk_set_state i = {
+ .flags = flags|BCH_BY_INDEX,
+ .new_state = new_state,
+ .dev = dev,
+ };
+
+ xioctl(fs.ioctl_fd, BCH_IOCTL_DISK_SET_STATE, &i);
+}
+
+static inline struct bch_ioctl_fs_usage *bchu_fs_usage(struct bchfs_handle fs)
+{
+ struct bch_ioctl_fs_usage *u = NULL;
+ size_t replica_entries_bytes = 4096;
+
+ while (1) {
+ u = xrealloc(u, sizeof(*u) + replica_entries_bytes);
+ u->replica_entries_bytes = replica_entries_bytes;
+
+ if (!ioctl(fs.ioctl_fd, BCH_IOCTL_FS_USAGE, u))
+ return u;
+
+ if (errno != ERANGE)
+ die("BCH_IOCTL_USAGE error: %m");
+
+ replica_entries_bytes *= 2;
+ }
+}
+
+static inline struct bch_ioctl_dev_usage_v2 *bchu_dev_usage(struct bchfs_handle fs,
+ unsigned idx)
+{
+ struct bch_ioctl_dev_usage_v2 *u = xcalloc(sizeof(*u) + sizeof(u->d[0]) * BCH_DATA_NR, 1);
+
+ u->dev = idx;
+ u->flags = BCH_BY_INDEX;
+ u->nr_data_types = BCH_DATA_NR;
+
+ if (!ioctl(fs.ioctl_fd, BCH_IOCTL_DEV_USAGE_V2, u))
+ return u;
+
+ struct bch_ioctl_dev_usage u_v1 = { .dev = idx, .flags = BCH_BY_INDEX};
+ xioctl(fs.ioctl_fd, BCH_IOCTL_DEV_USAGE, &u_v1);
+
+ u->state = u_v1.state;
+ u->nr_data_types = ARRAY_SIZE(u_v1.d);
+ u->bucket_size = u_v1.bucket_size;
+ u->nr_buckets = u_v1.nr_buckets;
+
+ for (unsigned i = 0; i < ARRAY_SIZE(u_v1.d); i++)
+ u->d[i] = u_v1.d[i];
+
+ return u;
+}
+
+static inline struct bch_sb *bchu_read_super(struct bchfs_handle fs, unsigned idx)
+{
+ size_t size = 4096;
+ struct bch_sb *sb = NULL;
+
+ while (1) {
+ sb = xrealloc(sb, size);
+ struct bch_ioctl_read_super i = {
+ .size = size,
+ .sb = (unsigned long) sb,
+ };
+
+ if (idx != -1) {
+ i.flags |= BCH_READ_DEV|BCH_BY_INDEX;
+ i.dev = idx;
+ }
+
+ if (!ioctl(fs.ioctl_fd, BCH_IOCTL_READ_SUPER, &i))
+ return sb;
+ if (errno != ERANGE)
+ die("BCH_IOCTL_READ_SUPER error: %m");
+ size *= 2;
+ }
+}
+
+static inline unsigned bchu_disk_get_idx(struct bchfs_handle fs, dev_t dev)
+{
+ struct bch_ioctl_disk_get_idx i = { .dev = dev };
+
+ return xioctl(fs.ioctl_fd, BCH_IOCTL_DISK_GET_IDX, &i);
+}
+
+static inline void bchu_disk_resize(struct bchfs_handle fs,
+ unsigned idx,
+ u64 nbuckets)
+{
+ struct bch_ioctl_disk_resize i = {
+ .flags = BCH_BY_INDEX,
+ .dev = idx,
+ .nbuckets = nbuckets,
+ };
+
+ xioctl(fs.ioctl_fd, BCH_IOCTL_DISK_RESIZE, &i);
+}
+
+static inline void bchu_disk_resize_journal(struct bchfs_handle fs,
+ unsigned idx,
+ u64 nbuckets)
+{
+ struct bch_ioctl_disk_resize i = {
+ .flags = BCH_BY_INDEX,
+ .dev = idx,
+ .nbuckets = nbuckets,
+ };
+
+ xioctl(fs.ioctl_fd, BCH_IOCTL_DISK_RESIZE_JOURNAL, &i);
+}
+
+int bchu_data(struct bchfs_handle, struct bch_ioctl_data);
+
+struct dev_name {
+ unsigned idx;
+ char *dev;
+ char *label;
+ uuid_t uuid;
+ unsigned durability;
+};
+typedef DARRAY(struct dev_name) dev_names;
+
+dev_names bchu_fs_get_devices(struct bchfs_handle);