--- /dev/null
+#ifdef BCACHEFS_FUSE
+
+#include <errno.h>
+#include <float.h>
+#include <getopt.h>
+#include <stdio.h>
+#include <sys/statvfs.h>
+
+#include <fuse_lowlevel.h>
+
+#include "cmds.h"
+#include "libbcachefs.h"
+#include "tools-util.h"
+
+#include "libbcachefs/bcachefs.h"
+#include "libbcachefs/alloc_foreground.h"
+#include "libbcachefs/btree_iter.h"
+#include "libbcachefs/buckets.h"
+#include "libbcachefs/dirent.h"
+#include "libbcachefs/errcode.h"
+#include "libbcachefs/error.h"
+#include "libbcachefs/fs-common.h"
+#include "libbcachefs/inode.h"
+#include "libbcachefs/io_read.h"
+#include "libbcachefs/io_write.h"
+#include "libbcachefs/opts.h"
+#include "libbcachefs/super.h"
+
+/* mode_to_type(): */
+#include "libbcachefs/fs.h"
+
+#include <linux/dcache.h>
+
+/* XXX cut and pasted from fsck.c */
+#define QSTR(n) { { { .len = strlen(n) } }, .name = n }
+
+/* used by write_aligned function for waiting on bch2_write closure */
+struct write_aligned_op_t {
+ struct closure cl;
+
+ /* must be last: */
+ struct bch_write_op op;
+};
+
+
+static inline subvol_inum map_root_ino(u64 ino)
+{
+ return (subvol_inum) { 1, ino == 1 ? 4096 : ino };
+}
+
+static inline u64 unmap_root_ino(u64 ino)
+{
+ return ino == 4096 ? 1 : ino;
+}
+
+static struct stat inode_to_stat(struct bch_fs *c,
+ struct bch_inode_unpacked *bi)
+{
+ return (struct stat) {
+ .st_ino = unmap_root_ino(bi->bi_inum),
+ .st_size = bi->bi_size,
+ .st_mode = bi->bi_mode,
+ .st_uid = bi->bi_uid,
+ .st_gid = bi->bi_gid,
+ .st_nlink = bch2_inode_nlink_get(bi),
+ .st_rdev = bi->bi_dev,
+ .st_blksize = block_bytes(c),
+ .st_blocks = bi->bi_sectors,
+ .st_atim = bch2_time_to_timespec(c, bi->bi_atime),
+ .st_mtim = bch2_time_to_timespec(c, bi->bi_mtime),
+ .st_ctim = bch2_time_to_timespec(c, bi->bi_ctime),
+ };
+}
+
+static struct fuse_entry_param inode_to_entry(struct bch_fs *c,
+ struct bch_inode_unpacked *bi)
+{
+ return (struct fuse_entry_param) {
+ .ino = unmap_root_ino(bi->bi_inum),
+ .generation = bi->bi_generation,
+ .attr = inode_to_stat(c, bi),
+ .attr_timeout = DBL_MAX,
+ .entry_timeout = DBL_MAX,
+ };
+}
+
+static void bcachefs_fuse_init(void *arg, struct fuse_conn_info *conn)
+{
+ if (conn->capable & FUSE_CAP_WRITEBACK_CACHE) {
+ fuse_log(FUSE_LOG_DEBUG, "fuse_init: activating writeback\n");
+ conn->want |= FUSE_CAP_WRITEBACK_CACHE;
+ } else
+ fuse_log(FUSE_LOG_DEBUG, "fuse_init: writeback not capable\n");
+
+ //conn->want |= FUSE_CAP_POSIX_ACL;
+}
+
+static void bcachefs_fuse_destroy(void *arg)
+{
+ struct bch_fs *c = arg;
+
+ bch2_fs_stop(c);
+}
+
+static void bcachefs_fuse_lookup(fuse_req_t req, fuse_ino_t dir_ino,
+ const char *name)
+{
+ subvol_inum dir = map_root_ino(dir_ino);
+ struct bch_fs *c = fuse_req_userdata(req);
+ struct bch_inode_unpacked bi;
+ struct qstr qstr = QSTR(name);
+ subvol_inum inum;
+ int ret;
+
+ fuse_log(FUSE_LOG_DEBUG, "fuse_lookup(dir=%llu name=%s)\n",
+ dir.inum, name);
+
+ ret = bch2_inode_find_by_inum(c, dir, &bi);
+ if (ret) {
+ fuse_reply_err(req, -ret);
+ return;
+ }
+
+ struct bch_hash_info hash_info = bch2_hash_info_init(c, &bi);
+
+ ret = bch2_dirent_lookup(c, dir, &hash_info, &qstr, &inum);
+ if (ret) {
+ struct fuse_entry_param e = {
+ .attr_timeout = DBL_MAX,
+ .entry_timeout = DBL_MAX,
+ };
+ fuse_reply_entry(req, &e);
+ return;
+ }
+
+ ret = bch2_inode_find_by_inum(c, inum, &bi);
+ if (ret)
+ goto err;
+
+ fuse_log(FUSE_LOG_DEBUG, "fuse_lookup ret(inum=%llu)\n",
+ bi.bi_inum);
+
+ struct fuse_entry_param e = inode_to_entry(c, &bi);
+ fuse_reply_entry(req, &e);
+ return;
+err:
+ fuse_log(FUSE_LOG_DEBUG, "fuse_lookup error %i\n", ret);
+ fuse_reply_err(req, -ret);
+}
+
+static void bcachefs_fuse_getattr(fuse_req_t req, fuse_ino_t ino,
+ struct fuse_file_info *fi)
+{
+ subvol_inum inum = map_root_ino(ino);
+ struct bch_fs *c = fuse_req_userdata(req);
+ struct bch_inode_unpacked bi;
+ struct stat attr;
+
+ fuse_log(FUSE_LOG_DEBUG, "fuse_getattr(inum=%llu)\n", inum.inum);
+
+ int ret = bch2_inode_find_by_inum(c, inum, &bi);
+ if (ret) {
+ fuse_log(FUSE_LOG_DEBUG, "fuse_getattr error %i\n", ret);
+ fuse_reply_err(req, -ret);
+ return;
+ }
+
+ fuse_log(FUSE_LOG_DEBUG, "fuse_getattr success\n");
+
+ attr = inode_to_stat(c, &bi);
+ fuse_reply_attr(req, &attr, DBL_MAX);
+}
+
+static void bcachefs_fuse_setattr(fuse_req_t req, fuse_ino_t ino,
+ struct stat *attr, int to_set,
+ struct fuse_file_info *fi)
+{
+ struct bch_fs *c = fuse_req_userdata(req);
+ struct bch_inode_unpacked inode_u;
+ struct btree_trans *trans;
+ struct btree_iter iter;
+ u64 now;
+ int ret;
+
+ subvol_inum inum = map_root_ino(ino);
+
+ fuse_log(FUSE_LOG_DEBUG, "bcachefs_fuse_setattr(%llu, %x)\n", inum.inum, to_set);
+
+ trans = bch2_trans_get(c);
+retry:
+ bch2_trans_begin(trans);
+ now = bch2_current_time(c);
+
+ ret = bch2_inode_peek(trans, &iter, &inode_u, inum, BTREE_ITER_INTENT);
+ if (ret)
+ goto err;
+
+ if (to_set & FUSE_SET_ATTR_MODE)
+ inode_u.bi_mode = attr->st_mode;
+ if (to_set & FUSE_SET_ATTR_UID)
+ inode_u.bi_uid = attr->st_uid;
+ if (to_set & FUSE_SET_ATTR_GID)
+ inode_u.bi_gid = attr->st_gid;
+ if (to_set & FUSE_SET_ATTR_SIZE)
+ inode_u.bi_size = attr->st_size;
+ if (to_set & FUSE_SET_ATTR_ATIME)
+ inode_u.bi_atime = timespec_to_bch2_time(c, attr->st_atim);
+ if (to_set & FUSE_SET_ATTR_MTIME)
+ inode_u.bi_mtime = timespec_to_bch2_time(c, attr->st_mtim);
+ if (to_set & FUSE_SET_ATTR_ATIME_NOW)
+ inode_u.bi_atime = now;
+ if (to_set & FUSE_SET_ATTR_MTIME_NOW)
+ inode_u.bi_mtime = now;
+ /* TODO: CTIME? */
+
+ ret = bch2_inode_write(trans, &iter, &inode_u) ?:
+ bch2_trans_commit(trans, NULL, NULL,
+ BCH_TRANS_COMMIT_no_enospc);
+err:
+ bch2_trans_iter_exit(trans, &iter);
+ if (ret == -EINTR)
+ goto retry;
+
+ bch2_trans_put(trans);
+
+ if (!ret) {
+ *attr = inode_to_stat(c, &inode_u);
+ fuse_reply_attr(req, attr, DBL_MAX);
+ } else {
+ fuse_reply_err(req, -ret);
+ }
+}
+
+static int do_create(struct bch_fs *c, subvol_inum dir,
+ const char *name, mode_t mode, dev_t rdev,
+ struct bch_inode_unpacked *new_inode)
+{
+ struct qstr qstr = QSTR(name);
+ struct bch_inode_unpacked dir_u;
+ uid_t uid = 0;
+ gid_t gid = 0;
+
+ bch2_inode_init_early(c, new_inode);
+
+ return bch2_trans_do(c, NULL, NULL, 0,
+ bch2_create_trans(trans,
+ dir, &dir_u,
+ new_inode, &qstr,
+ uid, gid, mode, rdev, NULL, NULL,
+ (subvol_inum) { 0 }, 0));
+}
+
+static void bcachefs_fuse_mknod(fuse_req_t req, fuse_ino_t dir_ino,
+ const char *name, mode_t mode,
+ dev_t rdev)
+{
+ subvol_inum dir = map_root_ino(dir_ino);
+ struct bch_fs *c = fuse_req_userdata(req);
+ struct bch_inode_unpacked new_inode;
+ int ret;
+
+ fuse_log(FUSE_LOG_DEBUG, "bcachefs_fuse_mknod(%llu, %s, %x, %x)\n",
+ dir.inum, name, mode, rdev);
+
+ ret = do_create(c, dir, name, mode, rdev, &new_inode);
+ if (ret)
+ goto err;
+
+ struct fuse_entry_param e = inode_to_entry(c, &new_inode);
+ fuse_reply_entry(req, &e);
+ return;
+err:
+ fuse_reply_err(req, -ret);
+}
+
+static void bcachefs_fuse_mkdir(fuse_req_t req, fuse_ino_t dir,
+ const char *name, mode_t mode)
+{
+ fuse_log(FUSE_LOG_DEBUG, "bcachefs_fuse_mkdir(%llu, %s, %x)\n",
+ dir, name, mode);
+
+ BUG_ON(mode & S_IFMT);
+
+ mode |= S_IFDIR;
+ bcachefs_fuse_mknod(req, dir, name, mode, 0);
+}
+
+static void bcachefs_fuse_unlink(fuse_req_t req, fuse_ino_t dir_ino,
+ const char *name)
+{
+ struct bch_fs *c = fuse_req_userdata(req);
+ struct bch_inode_unpacked dir_u, inode_u;
+ struct qstr qstr = QSTR(name);
+ subvol_inum dir = map_root_ino(dir_ino);
+
+ fuse_log(FUSE_LOG_DEBUG, "bcachefs_fuse_unlink(%llu, %s)\n", dir.inum, name);
+
+ int ret = bch2_trans_do(c, NULL, NULL,
+ BCH_TRANS_COMMIT_no_enospc,
+ bch2_unlink_trans(trans, dir, &dir_u,
+ &inode_u, &qstr, false));
+
+ fuse_reply_err(req, -ret);
+}
+
+static void bcachefs_fuse_rmdir(fuse_req_t req, fuse_ino_t dir,
+ const char *name)
+{
+ fuse_log(FUSE_LOG_DEBUG, "bcachefs_fuse_rmdir(%llu, %s)\n", dir, name);
+
+ bcachefs_fuse_unlink(req, dir, name);
+}
+
+static void bcachefs_fuse_rename(fuse_req_t req,
+ fuse_ino_t src_dir_ino, const char *srcname,
+ fuse_ino_t dst_dir_ino, const char *dstname,
+ unsigned flags)
+{
+ struct bch_fs *c = fuse_req_userdata(req);
+ struct bch_inode_unpacked dst_dir_u, src_dir_u;
+ struct bch_inode_unpacked src_inode_u, dst_inode_u;
+ struct qstr dst_name = QSTR(srcname);
+ struct qstr src_name = QSTR(dstname);
+ subvol_inum src_dir = map_root_ino(src_dir_ino);
+ subvol_inum dst_dir = map_root_ino(dst_dir_ino);
+ int ret;
+
+ fuse_log(FUSE_LOG_DEBUG,
+ "bcachefs_fuse_rename(%llu, %s, %llu, %s, %x)\n",
+ src_dir.inum, srcname, dst_dir.inum, dstname, flags);
+
+ /* XXX handle overwrites */
+ ret = bch2_trans_do(c, NULL, NULL, 0,
+ bch2_rename_trans(trans,
+ src_dir, &src_dir_u,
+ dst_dir, &dst_dir_u,
+ &src_inode_u, &dst_inode_u,
+ &src_name, &dst_name,
+ BCH_RENAME));
+
+ fuse_reply_err(req, -ret);
+}
+
+static void bcachefs_fuse_link(fuse_req_t req, fuse_ino_t ino,
+ fuse_ino_t newparent_ino, const char *newname)
+{
+ struct bch_fs *c = fuse_req_userdata(req);
+ struct bch_inode_unpacked dir_u, inode_u;
+ struct qstr qstr = QSTR(newname);
+ subvol_inum newparent = map_root_ino(newparent_ino);
+ subvol_inum inum = map_root_ino(ino);
+ int ret;
+
+ fuse_log(FUSE_LOG_DEBUG, "bcachefs_fuse_link(%llu, %llu, %s)\n",
+ inum.inum, newparent.inum, newname);
+
+ ret = bch2_trans_do(c, NULL, NULL, 0,
+ bch2_link_trans(trans, newparent, &dir_u,
+ inum, &inode_u, &qstr));
+
+ if (!ret) {
+ struct fuse_entry_param e = inode_to_entry(c, &inode_u);
+ fuse_reply_entry(req, &e);
+ } else {
+ fuse_reply_err(req, -ret);
+ }
+}
+
+static void bcachefs_fuse_open(fuse_req_t req, fuse_ino_t inum,
+ struct fuse_file_info *fi)
+{
+ fi->direct_io = false;
+ fi->keep_cache = true;
+ fi->cache_readdir = true;
+
+ fuse_reply_open(req, fi);
+}
+
+static void userbio_init(struct bio *bio, struct bio_vec *bv,
+ void *buf, size_t size)
+{
+ bio_init(bio, NULL, bv, 1, 0);
+ bio->bi_iter.bi_size = size;
+ bv->bv_page = buf;
+ bv->bv_len = size;
+ bv->bv_offset = 0;
+}
+
+static int get_inode_io_opts(struct bch_fs *c, subvol_inum inum, struct bch_io_opts *opts)
+{
+ struct bch_inode_unpacked inode;
+ if (bch2_inode_find_by_inum(c, inum, &inode))
+ return -EINVAL;
+
+ bch2_inode_opts_get(opts, c, &inode);
+ return 0;
+}
+
+static void bcachefs_fuse_read_endio(struct bio *bio)
+{
+ closure_put(bio->bi_private);
+}
+
+
+static void bcachefs_fuse_write_endio(struct bch_write_op *op)
+{
+ struct write_aligned_op_t *w = container_of(op,struct write_aligned_op_t,op);
+ closure_put(&w->cl);
+}
+
+
+struct fuse_align_io {
+ off_t start;
+ size_t pad_start;
+ off_t end;
+ size_t pad_end;
+ size_t size;
+};
+
+/* Handle unaligned start and end */
+/* TODO: align to block_bytes, sector size, or page size? */
+static struct fuse_align_io align_io(const struct bch_fs *c, size_t size,
+ off_t offset)
+{
+ struct fuse_align_io align;
+
+ BUG_ON(offset < 0);
+
+ align.start = round_down(offset, block_bytes(c));
+ align.pad_start = offset - align.start;
+
+ off_t end = offset + size;
+ align.end = round_up(end, block_bytes(c));
+ align.pad_end = align.end - end;
+
+ align.size = align.end - align.start;
+
+ return align;
+}
+
+/*
+ * Given an aligned number of bytes transferred, figure out how many unaligned
+ * bytes were transferred.
+ */
+static size_t align_fix_up_bytes(const struct fuse_align_io *align,
+ size_t align_bytes)
+{
+ size_t bytes = 0;
+
+ if (align_bytes > align->pad_start) {
+ bytes = align_bytes - align->pad_start;
+ bytes = bytes > align->pad_end ? bytes - align->pad_end : 0;
+ }
+
+ return bytes;
+}
+
+/*
+ * Read aligned data.
+ */
+static int read_aligned(struct bch_fs *c, subvol_inum inum, size_t aligned_size,
+ off_t aligned_offset, void *buf)
+{
+ BUG_ON(aligned_size & (block_bytes(c) - 1));
+ BUG_ON(aligned_offset & (block_bytes(c) - 1));
+
+ struct bch_io_opts io_opts;
+ if (get_inode_io_opts(c, inum, &io_opts))
+ return -ENOENT;
+
+ struct bch_read_bio rbio;
+ struct bio_vec bv;
+ userbio_init(&rbio.bio, &bv, buf, aligned_size);
+ bio_set_op_attrs(&rbio.bio, REQ_OP_READ, REQ_SYNC);
+ rbio.bio.bi_iter.bi_sector = aligned_offset >> 9;
+
+ struct closure cl;
+ closure_init_stack(&cl);
+
+ closure_get(&cl);
+ rbio.bio.bi_end_io = bcachefs_fuse_read_endio;
+ rbio.bio.bi_private = &cl;
+
+ bch2_read(c, rbio_init(&rbio.bio, io_opts), inum);
+
+ closure_sync(&cl);
+
+ return -blk_status_to_errno(rbio.bio.bi_status);
+}
+
+static void bcachefs_fuse_read(fuse_req_t req, fuse_ino_t ino,
+ size_t size, off_t offset,
+ struct fuse_file_info *fi)
+{
+ subvol_inum inum = map_root_ino(ino);
+ struct bch_fs *c = fuse_req_userdata(req);
+
+ fuse_log(FUSE_LOG_DEBUG, "bcachefs_fuse_read(%llu, %zd, %lld)\n",
+ inum, size, offset);
+
+ /* Check inode size. */
+ struct bch_inode_unpacked bi;
+ int ret = bch2_inode_find_by_inum(c, inum, &bi);
+ if (ret) {
+ fuse_reply_err(req, -ret);
+ return;
+ }
+
+ off_t end = min_t(u64, bi.bi_size, offset + size);
+ if (end <= offset) {
+ fuse_reply_buf(req, NULL, 0);
+ return;
+ }
+ size = end - offset;
+
+ struct fuse_align_io align = align_io(c, size, offset);
+
+ void *buf = aligned_alloc(PAGE_SIZE, align.size);
+ if (!buf) {
+ fuse_reply_err(req, ENOMEM);
+ return;
+ }
+
+ ret = read_aligned(c, inum, align.size, align.start, buf);
+
+ if (likely(!ret))
+ fuse_reply_buf(req, buf + align.pad_start, size);
+ else
+ fuse_reply_err(req, -ret);
+
+ free(buf);
+}
+
+static int inode_update_times(struct bch_fs *c, subvol_inum inum)
+{
+ struct btree_trans *trans;
+ struct btree_iter iter;
+ struct bch_inode_unpacked inode_u;
+ int ret = 0;
+ u64 now;
+
+ trans = bch2_trans_get(c);
+retry:
+ bch2_trans_begin(trans);
+ now = bch2_current_time(c);
+
+ ret = bch2_inode_peek(trans, &iter, &inode_u, inum, BTREE_ITER_INTENT);
+ if (ret)
+ goto err;
+
+ inode_u.bi_mtime = now;
+ inode_u.bi_ctime = now;
+
+ ret = bch2_inode_write(trans, &iter, &inode_u);
+ if (ret)
+ goto err;
+
+ ret = bch2_trans_commit(trans, NULL, NULL,
+ BCH_TRANS_COMMIT_no_enospc);
+err:
+ bch2_trans_iter_exit(trans, &iter);
+ if (ret == -EINTR)
+ goto retry;
+
+ bch2_trans_put(trans);
+ return ret;
+}
+
+static int write_aligned(struct bch_fs *c, subvol_inum inum,
+ struct bch_io_opts io_opts, void *buf,
+ size_t aligned_size, off_t aligned_offset,
+ off_t new_i_size, size_t *written_out)
+{
+
+ struct write_aligned_op_t w = { 0 }
+;
+ struct bch_write_op *op = &w.op;
+ struct bio_vec bv;
+
+ BUG_ON(aligned_size & (block_bytes(c) - 1));
+ BUG_ON(aligned_offset & (block_bytes(c) - 1));
+
+ *written_out = 0;
+
+ closure_init_stack(&w.cl);
+
+ bch2_write_op_init(op, c, io_opts); /* XXX reads from op?! */
+ op->write_point = writepoint_hashed(0);
+ op->nr_replicas = io_opts.data_replicas;
+ op->target = io_opts.foreground_target;
+ op->subvol = inum.subvol;
+ op->pos = POS(inum.inum, aligned_offset >> 9);
+ op->new_i_size = new_i_size;
+ op->end_io = bcachefs_fuse_write_endio;
+
+ userbio_init(&op->wbio.bio, &bv, buf, aligned_size);
+ bio_set_op_attrs(&op->wbio.bio, REQ_OP_WRITE, REQ_SYNC);
+
+ if (bch2_disk_reservation_get(c, &op->res, aligned_size >> 9,
+ op->nr_replicas, 0)) {
+ /* XXX: use check_range_allocated like dio write path */
+ return -ENOSPC;
+ }
+
+ closure_get(&w.cl);
+
+ closure_call(&op->cl, bch2_write, NULL, NULL);
+
+ closure_sync(&w.cl);
+
+ if (!op->error)
+ *written_out = op->written << 9;
+
+ return op->error;
+}
+
+static void bcachefs_fuse_write(fuse_req_t req, fuse_ino_t ino,
+ const char *buf, size_t size,
+ off_t offset,
+ struct fuse_file_info *fi)
+{
+ subvol_inum inum = map_root_ino(ino);
+ struct bch_fs *c = fuse_req_userdata(req);
+ struct bch_io_opts io_opts;
+ size_t aligned_written;
+ int ret = 0;
+
+ fuse_log(FUSE_LOG_DEBUG, "bcachefs_fuse_write(%llu, %zd, %lld)\n",
+ inum, size, offset);
+
+ struct fuse_align_io align = align_io(c, size, offset);
+ void *aligned_buf = aligned_alloc(PAGE_SIZE, align.size);
+ BUG_ON(!aligned_buf);
+
+ if (get_inode_io_opts(c, inum, &io_opts)) {
+ ret = -ENOENT;
+ goto err;
+ }
+
+ /* Realign the data and read in start and end, if needed */
+
+ /* Read partial start data. */
+ if (align.pad_start) {
+ memset(aligned_buf, 0, block_bytes(c));
+
+ ret = read_aligned(c, inum, block_bytes(c), align.start,
+ aligned_buf);
+ if (ret)
+ goto err;
+ }
+
+ /*
+ * Read partial end data. If the whole write fits in one block, the
+ * start data and the end data are the same so this isn't needed.
+ */
+ if (align.pad_end &&
+ !(align.pad_start && align.size == block_bytes(c))) {
+ off_t partial_end_start = align.end - block_bytes(c);
+ size_t buf_offset = align.size - block_bytes(c);
+
+ memset(aligned_buf + buf_offset, 0, block_bytes(c));
+
+ ret = read_aligned(c, inum, block_bytes(c), partial_end_start,
+ aligned_buf + buf_offset);
+ if (ret)
+ goto err;
+ }
+
+ /* Overlay what we want to write. */
+ memcpy(aligned_buf + align.pad_start, buf, size);
+
+ /* Actually write. */
+ ret = write_aligned(c, inum, io_opts, aligned_buf,
+ align.size, align.start,
+ offset + size, &aligned_written);
+
+ /* Figure out how many unaligned bytes were written. */
+ size_t written = align_fix_up_bytes(&align, aligned_written);
+ BUG_ON(written > size);
+
+ fuse_log(FUSE_LOG_DEBUG, "bcachefs_fuse_write: wrote %zd bytes\n",
+ written);
+
+ if (written > 0)
+ ret = 0;
+
+ /*
+ * Update inode times.
+ * TODO: Integrate with bch2_extent_update()
+ */
+ if (!ret)
+ ret = inode_update_times(c, inum);
+
+ if (!ret) {
+ BUG_ON(written == 0);
+ fuse_reply_write(req, written);
+ free(aligned_buf);
+ return;
+ }
+
+err:
+ fuse_reply_err(req, -ret);
+ free(aligned_buf);
+}
+
+static void bcachefs_fuse_symlink(fuse_req_t req, const char *link,
+ fuse_ino_t dir_ino, const char *name)
+{
+ subvol_inum dir = map_root_ino(dir_ino);
+ struct bch_fs *c = fuse_req_userdata(req);
+ struct bch_inode_unpacked new_inode;
+ size_t link_len = strlen(link);
+ int ret;
+
+ fuse_log(FUSE_LOG_DEBUG, "bcachefs_fuse_symlink(%s, %llu, %s)\n",
+ link, dir.inum, name);
+
+ ret = do_create(c, dir, name, S_IFLNK|S_IRWXUGO, 0, &new_inode);
+ if (ret)
+ goto err;
+
+ struct bch_io_opts io_opts;
+ ret = get_inode_io_opts(c, dir, &io_opts);
+ if (ret)
+ goto err;
+
+ struct fuse_align_io align = align_io(c, link_len + 1, 0);
+
+ void *aligned_buf = aligned_alloc(PAGE_SIZE, align.size);
+ BUG_ON(!aligned_buf);
+
+ memset(aligned_buf, 0, align.size);
+ memcpy(aligned_buf, link, link_len); /* already terminated */
+
+ subvol_inum inum = (subvol_inum) { dir.subvol, new_inode.bi_inum };
+
+ size_t aligned_written;
+ ret = write_aligned(c, inum, io_opts, aligned_buf,
+ align.size, align.start, link_len + 1,
+ &aligned_written);
+ free(aligned_buf);
+
+ if (ret)
+ goto err;
+
+ size_t written = align_fix_up_bytes(&align, aligned_written);
+ BUG_ON(written != link_len + 1); // TODO: handle short
+
+ ret = inode_update_times(c, inum);
+ if (ret)
+ goto err;
+
+ new_inode.bi_size = written;
+
+ struct fuse_entry_param e = inode_to_entry(c, &new_inode);
+ fuse_reply_entry(req, &e);
+ return;
+
+err:
+ fuse_reply_err(req, -ret);
+}
+
+static void bcachefs_fuse_readlink(fuse_req_t req, fuse_ino_t ino)
+{
+ subvol_inum inum = map_root_ino(ino);
+ struct bch_fs *c = fuse_req_userdata(req);
+ char *buf = NULL;
+
+ fuse_log(FUSE_LOG_DEBUG, "bcachefs_fuse_readlink(%llu)\n", inum.inum);
+
+ struct bch_inode_unpacked bi;
+ int ret = bch2_inode_find_by_inum(c, inum, &bi);
+ if (ret)
+ goto err;
+
+ struct fuse_align_io align = align_io(c, bi.bi_size, 0);
+
+ ret = -ENOMEM;
+ buf = aligned_alloc(PAGE_SIZE, align.size);
+ if (!buf)
+ goto err;
+
+ ret = read_aligned(c, inum, align.size, align.start, buf);
+ if (ret)
+ goto err;
+
+ BUG_ON(buf[align.size - 1] != 0);
+
+ fuse_reply_readlink(req, buf);
+
+err:
+ if (ret)
+ fuse_reply_err(req, -ret);
+
+ free(buf);
+}
+
+#if 0
+/*
+ * FUSE flush is essentially the close() call, however it is not guaranteed
+ * that one flush happens per open/create.
+ *
+ * It doesn't have to do anything, and is mostly relevant for NFS-style
+ * filesystems where close has some relationship to caching.
+ */
+static void bcachefs_fuse_flush(fuse_req_t req, fuse_ino_t inum,
+ struct fuse_file_info *fi)
+{
+ struct bch_fs *c = fuse_req_userdata(req);
+}
+
+static void bcachefs_fuse_release(fuse_req_t req, fuse_ino_t inum,
+ struct fuse_file_info *fi)
+{
+ struct bch_fs *c = fuse_req_userdata(req);
+}
+
+static void bcachefs_fuse_fsync(fuse_req_t req, fuse_ino_t inum, int datasync,
+ struct fuse_file_info *fi)
+{
+ struct bch_fs *c = fuse_req_userdata(req);
+}
+
+static void bcachefs_fuse_opendir(fuse_req_t req, fuse_ino_t inum,
+ struct fuse_file_info *fi)
+{
+ struct bch_fs *c = fuse_req_userdata(req);
+}
+#endif
+
+struct fuse_dir_context {
+ struct dir_context ctx;
+ fuse_req_t req;
+ char *buf;
+ size_t bufsize;
+};
+
+struct fuse_dirent {
+ uint64_t ino;
+ uint64_t off;
+ uint32_t namelen;
+ uint32_t type;
+ char name[];
+};
+
+#define FUSE_NAME_OFFSET offsetof(struct fuse_dirent, name)
+#define FUSE_DIRENT_ALIGN(x) \
+ (((x) + sizeof(uint64_t) - 1) & ~(sizeof(uint64_t) - 1))
+
+static size_t fuse_add_direntry2(char *buf, size_t bufsize,
+ const char *name, int namelen,
+ const struct stat *stbuf, off_t off)
+{
+ size_t entlen = FUSE_NAME_OFFSET + namelen;
+ size_t entlen_padded = FUSE_DIRENT_ALIGN(entlen);
+ struct fuse_dirent *dirent = (struct fuse_dirent *) buf;
+
+ if ((buf == NULL) || (entlen_padded > bufsize))
+ return entlen_padded;
+
+ dirent->ino = stbuf->st_ino;
+ dirent->off = off;
+ dirent->namelen = namelen;
+ dirent->type = (stbuf->st_mode & S_IFMT) >> 12;
+ memcpy(dirent->name, name, namelen);
+ memset(dirent->name + namelen, 0, entlen_padded - entlen);
+
+ return entlen_padded;
+}
+
+static int fuse_filldir(struct dir_context *_ctx,
+ const char *name, int namelen,
+ loff_t pos, u64 ino, unsigned type)
+{
+ struct fuse_dir_context *ctx =
+ container_of(_ctx, struct fuse_dir_context, ctx);
+
+ struct stat statbuf = {
+ .st_ino = unmap_root_ino(ino),
+ .st_mode = type << 12,
+ };
+
+ fuse_log(FUSE_LOG_DEBUG, "fuse_filldir(name=%s inum=%llu pos=%llu)\n",
+ name, statbuf.st_ino, pos);
+
+ size_t len = fuse_add_direntry2(ctx->buf,
+ ctx->bufsize,
+ name,
+ namelen,
+ &statbuf,
+ pos + 1);
+
+ if (len > ctx->bufsize)
+ return -1;
+
+ ctx->buf += len;
+ ctx->bufsize -= len;
+
+ return 0;
+}
+
+static bool handle_dots(struct fuse_dir_context *ctx, fuse_ino_t dir)
+{
+ if (ctx->ctx.pos == 0) {
+ if (fuse_filldir(&ctx->ctx, ".", 1, ctx->ctx.pos,
+ dir, DT_DIR) < 0)
+ return false;
+ ctx->ctx.pos = 1;
+ }
+
+ if (ctx->ctx.pos == 1) {
+ if (fuse_filldir(&ctx->ctx, "..", 2, ctx->ctx.pos,
+ /*TODO: parent*/ 1, DT_DIR) < 0)
+ return false;
+ ctx->ctx.pos = 2;
+ }
+
+ return true;
+}
+
+static void bcachefs_fuse_readdir(fuse_req_t req, fuse_ino_t dir_ino,
+ size_t size, off_t off,
+ struct fuse_file_info *fi)
+{
+ subvol_inum dir = map_root_ino(dir_ino);
+ struct bch_fs *c = fuse_req_userdata(req);
+ struct bch_inode_unpacked bi;
+ char *buf = calloc(size, 1);
+ struct fuse_dir_context ctx = {
+ .ctx.actor = fuse_filldir,
+ .ctx.pos = off,
+ .req = req,
+ .buf = buf,
+ .bufsize = size,
+ };
+ int ret = 0;
+
+ fuse_log(FUSE_LOG_DEBUG, "bcachefs_fuse_readdir(dir=%llu, size=%zu, "
+ "off=%lld)\n", dir.inum, size, off);
+
+ ret = bch2_inode_find_by_inum(c, dir, &bi);
+ if (ret)
+ goto reply;
+
+ if (!S_ISDIR(bi.bi_mode)) {
+ ret = -ENOTDIR;
+ goto reply;
+ }
+
+ if (!handle_dots(&ctx, dir.inum))
+ goto reply;
+
+ ret = bch2_readdir(c, dir, &ctx.ctx);
+reply:
+ if (!ret) {
+ fuse_log(FUSE_LOG_DEBUG, "bcachefs_fuse_readdir reply %zd\n",
+ ctx.buf - buf);
+ fuse_reply_buf(req, buf, ctx.buf - buf);
+ } else {
+ fuse_reply_err(req, -ret);
+ }
+
+ free(buf);
+}
+
+#if 0
+static void bcachefs_fuse_readdirplus(fuse_req_t req, fuse_ino_t dir,
+ size_t size, off_t off,
+ struct fuse_file_info *fi)
+{
+
+}
+
+static void bcachefs_fuse_releasedir(fuse_req_t req, fuse_ino_t inum,
+ struct fuse_file_info *fi)
+{
+ struct bch_fs *c = fuse_req_userdata(req);
+}
+
+static void bcachefs_fuse_fsyncdir(fuse_req_t req, fuse_ino_t inum, int datasync,
+ struct fuse_file_info *fi)
+{
+ struct bch_fs *c = fuse_req_userdata(req);
+}
+#endif
+
+static void bcachefs_fuse_statfs(fuse_req_t req, fuse_ino_t inum)
+{
+ struct bch_fs *c = fuse_req_userdata(req);
+ struct bch_fs_usage_short usage = bch2_fs_usage_read_short(c);
+ unsigned shift = c->block_bits;
+ struct statvfs statbuf = {
+ .f_bsize = block_bytes(c),
+ .f_frsize = block_bytes(c),
+ .f_blocks = usage.capacity >> shift,
+ .f_bfree = (usage.capacity - usage.used) >> shift,
+ //.f_bavail = statbuf.f_bfree,
+ .f_files = usage.nr_inodes,
+ .f_ffree = U64_MAX,
+ .f_namemax = BCH_NAME_MAX,
+ };
+
+ fuse_reply_statfs(req, &statbuf);
+}
+
+#if 0
+static void bcachefs_fuse_setxattr(fuse_req_t req, fuse_ino_t inum,
+ const char *name, const char *value,
+ size_t size, int flags)
+{
+ struct bch_fs *c = fuse_req_userdata(req);
+}
+
+static void bcachefs_fuse_getxattr(fuse_req_t req, fuse_ino_t inum,
+ const char *name, size_t size)
+{
+ struct bch_fs *c = fuse_req_userdata(req);
+
+ fuse_reply_xattr(req, );
+}
+
+static void bcachefs_fuse_listxattr(fuse_req_t req, fuse_ino_t inum, size_t size)
+{
+ struct bch_fs *c = fuse_req_userdata(req);
+}
+
+static void bcachefs_fuse_removexattr(fuse_req_t req, fuse_ino_t inum,
+ const char *name)
+{
+ struct bch_fs *c = fuse_req_userdata(req);
+}
+#endif
+
+static void bcachefs_fuse_create(fuse_req_t req, fuse_ino_t dir_ino,
+ const char *name, mode_t mode,
+ struct fuse_file_info *fi)
+{
+ subvol_inum dir = map_root_ino(dir_ino);
+ struct bch_fs *c = fuse_req_userdata(req);
+ struct bch_inode_unpacked new_inode;
+ int ret;
+
+ fuse_log(FUSE_LOG_DEBUG, "bcachefs_fuse_create(%llu, %s, %x)\n",
+ dir.inum, name, mode);
+
+ ret = do_create(c, dir, name, mode, 0, &new_inode);
+ if (ret)
+ goto err;
+
+ struct fuse_entry_param e = inode_to_entry(c, &new_inode);
+ fuse_reply_create(req, &e, fi);
+ return;
+err:
+ fuse_reply_err(req, -ret);
+}
+
+#if 0
+static void bcachefs_fuse_write_buf(fuse_req_t req, fuse_ino_t inum,
+ struct fuse_bufvec *bufv, off_t off,
+ struct fuse_file_info *fi)
+{
+ struct bch_fs *c = fuse_req_userdata(req);
+}
+
+static void bcachefs_fuse_fallocate(fuse_req_t req, fuse_ino_t inum, int mode,
+ off_t offset, off_t length,
+ struct fuse_file_info *fi)
+{
+ struct bch_fs *c = fuse_req_userdata(req);
+}
+#endif
+
+static const struct fuse_lowlevel_ops bcachefs_fuse_ops = {
+ .init = bcachefs_fuse_init,
+ .destroy = bcachefs_fuse_destroy,
+ .lookup = bcachefs_fuse_lookup,
+ .getattr = bcachefs_fuse_getattr,
+ .setattr = bcachefs_fuse_setattr,
+ .readlink = bcachefs_fuse_readlink,
+ .mknod = bcachefs_fuse_mknod,
+ .mkdir = bcachefs_fuse_mkdir,
+ .unlink = bcachefs_fuse_unlink,
+ .rmdir = bcachefs_fuse_rmdir,
+ .symlink = bcachefs_fuse_symlink,
+ .rename = bcachefs_fuse_rename,
+ .link = bcachefs_fuse_link,
+ .open = bcachefs_fuse_open,
+ .read = bcachefs_fuse_read,
+ .write = bcachefs_fuse_write,
+ //.flush = bcachefs_fuse_flush,
+ //.release = bcachefs_fuse_release,
+ //.fsync = bcachefs_fuse_fsync,
+ //.opendir = bcachefs_fuse_opendir,
+ .readdir = bcachefs_fuse_readdir,
+ //.readdirplus = bcachefs_fuse_readdirplus,
+ //.releasedir = bcachefs_fuse_releasedir,
+ //.fsyncdir = bcachefs_fuse_fsyncdir,
+ .statfs = bcachefs_fuse_statfs,
+ //.setxattr = bcachefs_fuse_setxattr,
+ //.getxattr = bcachefs_fuse_getxattr,
+ //.listxattr = bcachefs_fuse_listxattr,
+ //.removexattr = bcachefs_fuse_removexattr,
+ .create = bcachefs_fuse_create,
+
+ /* posix locks: */
+#if 0
+ .getlk = bcachefs_fuse_getlk,
+ .setlk = bcachefs_fuse_setlk,
+#endif
+ //.write_buf = bcachefs_fuse_write_buf,
+ //.fallocate = bcachefs_fuse_fallocate,
+
+};
+
+/*
+ * Setup and command parsing.
+ */
+
+struct bf_context {
+ char *devices_str;
+ char **devices;
+ int nr_devices;
+};
+
+static void bf_context_free(struct bf_context *ctx)
+{
+ int i;
+
+ free(ctx->devices_str);
+ for (i = 0; i < ctx->nr_devices; ++i)
+ free(ctx->devices[i]);
+ free(ctx->devices);
+}
+
+static struct fuse_opt bf_opts[] = {
+ FUSE_OPT_END
+};
+
+/*
+ * Fuse option parsing helper -- returning 0 means we consumed the argument, 1
+ * means we did not.
+ */
+static int bf_opt_proc(void *data, const char *arg, int key,
+ struct fuse_args *outargs)
+{
+ struct bf_context *ctx = data;
+
+ switch (key) {
+ case FUSE_OPT_KEY_NONOPT:
+ /* Just extract the first non-option string. */
+ if (!ctx->devices_str) {
+ ctx->devices_str = strdup(arg);
+ return 0;
+ }
+ return 1;
+ }
+
+ return 1;
+}
+
+/*
+ * dev1:dev2 -> [ dev1, dev2 ]
+ * dev -> [ dev ]
+ */
+static void tokenize_devices(struct bf_context *ctx)
+{
+ char *devices_str = strdup(ctx->devices_str);
+ char *devices_tmp = devices_str;
+ char **devices = NULL;
+ int nr = 0;
+ char *dev = NULL;
+
+ while ((dev = strsep(&devices_tmp, ":"))) {
+ if (strlen(dev) > 0) {
+ devices = realloc(devices, (nr + 1) * sizeof *devices);
+ devices[nr] = strdup(dev);
+ nr++;
+ }
+ }
+
+ if (!devices) {
+ devices = malloc(sizeof *devices);
+ devices[0] = strdup(ctx->devices_str);
+ nr = 1;
+ }
+
+ ctx->devices = devices;
+ ctx->nr_devices = nr;
+
+ free(devices_str);
+}
+
+static void usage(char *argv[])
+{
+ printf("Usage: %s fusemount [options] <dev>[:dev2:...] <mountpoint>\n",
+ argv[0]);
+ printf("\n");
+}
+
+int cmd_fusemount(int argc, char *argv[])
+{
+ struct fuse_args args = FUSE_ARGS_INIT(argc, argv);
+ struct bch_opts bch_opts = bch2_opts_empty();
+ struct bf_context ctx = { 0 };
+ struct bch_fs *c = NULL;
+ int ret = 0, i;
+
+ /* Parse arguments. */
+ if (fuse_opt_parse(&args, &ctx, bf_opts, bf_opt_proc) < 0)
+ die("fuse_opt_parse err: %m");
+
+ struct fuse_cmdline_opts fuse_opts;
+ if (fuse_parse_cmdline(&args, &fuse_opts) < 0)
+ die("fuse_parse_cmdline err: %m");
+
+ if (fuse_opts.show_help) {
+ usage(argv);
+ fuse_cmdline_help();
+ fuse_lowlevel_help();
+ ret = 0;
+ goto out;
+ }
+ if (fuse_opts.show_version) {
+ /* TODO: Show bcachefs version. */
+ printf("FUSE library version %s\n", fuse_pkgversion());
+ fuse_lowlevel_version();
+ ret = 0;
+ goto out;
+ }
+ if (!fuse_opts.mountpoint) {
+ usage(argv);
+ printf("Please supply a mountpoint.\n");
+ ret = 1;
+ goto out;
+ }
+ if (!ctx.devices_str) {
+ usage(argv);
+ printf("Please specify a device or device1:device2:...\n");
+ ret = 1;
+ goto out;
+ }
+ tokenize_devices(&ctx);
+
+ struct printbuf fsname = PRINTBUF;
+ prt_printf(&fsname, "fsname=");
+ for (i = 0; i < ctx.nr_devices; ++i) {
+ if (i)
+ prt_str(&fsname, ":");
+ prt_str(&fsname, ctx.devices[i]);
+ }
+
+ fuse_opt_add_arg(&args, "-o");
+ fuse_opt_add_arg(&args, fsname.buf);
+
+ /* Open bch */
+ printf("Opening bcachefs filesystem on:\n");
+ for (i = 0; i < ctx.nr_devices; ++i)
+ printf("\t%s\n", ctx.devices[i]);
+
+ c = bch2_fs_open(ctx.devices, ctx.nr_devices, bch_opts);
+ if (IS_ERR(c))
+ die("error opening %s: %s", ctx.devices_str,
+ bch2_err_str(PTR_ERR(c)));
+
+ /* Fuse */
+ struct fuse_session *se =
+ fuse_session_new(&args, &bcachefs_fuse_ops,
+ sizeof(bcachefs_fuse_ops), c);
+ if (!se)
+ die("fuse_lowlevel_new err: %m");
+
+ if (fuse_set_signal_handlers(se) < 0)
+ die("fuse_set_signal_handlers err: %m");
+
+ if (fuse_session_mount(se, fuse_opts.mountpoint))
+ die("fuse_mount err: %m");
+
+ /* This print statement is a trigger for tests. */
+ printf("Fuse mount initialized.\n");
+
+ if (fuse_opts.foreground == 0){
+ printf("Fuse forcing to foreground mode, due gcc constructors usage.\n");
+ fuse_opts.foreground = 1;
+ }
+
+ fuse_daemonize(fuse_opts.foreground);
+
+ ret = fuse_session_loop(se);
+
+ /* Cleanup */
+ fuse_session_unmount(se);
+ fuse_remove_signal_handlers(se);
+ fuse_session_destroy(se);
+
+out:
+ free(fuse_opts.mountpoint);
+ fuse_opt_free_args(&args);
+ bf_context_free(&ctx);
+
+ return ret ? 1 : 0;
+}
+
+#endif /* BCACHEFS_FUSE */
projects / bcachefs-tools-debian / blobdiff