1 files changed, 267 insertions, 0 deletions
diff --git a/c_src/libbcachefs.h b/c_src/libbcachefs.h
new file mode 100644
index 00000000..b189a208
--- /dev/null
+++ b/c_src/libbcachefs.h
@@ -0,0 +1,267 @@
+#ifndef _LIBBCACHE_H
+#define _LIBBCACHE_H
+
+#include <linux/uuid.h>
+#include <stdbool.h>
+
+#include "libbcachefs/bcachefs_format.h"
+#include "libbcachefs/bcachefs_ioctl.h"
+#include "libbcachefs/opts.h"
+#include "libbcachefs/vstructs.h"
+#include "tools-util.h"
+
+/* option parsing */
+
+#define SUPERBLOCK_SIZE_DEFAULT		2048	/* 1 MB */
+
+struct bch_opt_strs {
+union {
+	char			*by_id[bch2_opts_nr];
+struct {
+#define x(_name, ...)	char	*_name;
+	BCH_OPTS()
+#undef x
+};
+};
+};
+
+void bch2_opt_strs_free(struct bch_opt_strs *);
+struct bch_opt_strs bch2_cmdline_opts_get(int *, char *[], unsigned);
+struct bch_opts bch2_parse_opts(struct bch_opt_strs);
+void bch2_opts_usage(unsigned);
+
+struct format_opts {
+	char		*label;
+	__uuid_t	uuid;
+	unsigned	version;
+	unsigned	superblock_size;
+	bool		encrypted;
+	char		*passphrase;
+};
+
+static inline struct format_opts format_opts_default()
+{
+	unsigned version = !access(   "/sys/module/bcachefs/parameters/version", R_OK)
+	    ? read_file_u64(AT_FDCWD, "/sys/module/bcachefs/parameters/version")
+	    : bcachefs_metadata_version_current;
+
+	return (struct format_opts) {
+		.version		= version,
+		.superblock_size	= SUPERBLOCK_SIZE_DEFAULT,
+	};
+}
+
+struct dev_opts {
+	struct block_device *bdev;
+	char		*path;
+	u64		size;		/* bytes*/
+	u64		bucket_size;	/* bytes */
+	const char	*label;
+	unsigned	data_allowed;
+	unsigned	durability;
+	bool		discard;
+
+	u64		nbuckets;
+
+	u64		sb_offset;
+	u64		sb_end;
+};
+
+static inline struct dev_opts dev_opts_default()
+{
+	return (struct dev_opts) {
+		.data_allowed		= ~0U << 2,
+		.durability		= 1,
+	};
+}
+
+u64 bch2_pick_bucket_size(struct bch_opts, struct dev_opts *);
+void bch2_check_bucket_size(struct bch_opts, struct dev_opts *);
+
+struct bch_sb *bch2_format(struct bch_opt_strs,
+			   struct bch_opts,
+			   struct format_opts, struct dev_opts *, size_t);
+
+void bch2_super_write(int, struct bch_sb *);
+struct bch_sb *__bch2_super_read(int, u64);
+
+/* 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);
+
+#endif /* _LIBBCACHE_H */