+#ifndef NO_BCACHEFS_FS
+
+static int opt_to_inode_opt(int id)
+{
+ switch (id) {
+#define x(name, ...) \
+ case Opt_##name: return Inode_opt_##name;
+ BCH_INODE_OPTS()
+#undef x
+ default:
+ return -1;
+ }
+}
+
+static int __bch2_xattr_bcachefs_get(const struct xattr_handler *handler,
+ struct dentry *dentry, struct inode *vinode,
+ const char *name, void *buffer, size_t size,
+ bool all)
+{
+ struct bch_inode_info *inode = to_bch_ei(vinode);
+ struct bch_fs *c = inode->v.i_sb->s_fs_info;
+ struct bch_opts opts =
+ bch2_inode_opts_to_opts(bch2_inode_opts_get(&inode->ei_inode));
+ const struct bch_option *opt;
+ int id, inode_opt_id;
+ struct printbuf out = PRINTBUF;
+ int ret;
+ u64 v;
+
+ id = bch2_opt_lookup(name);
+ if (id < 0 || !bch2_opt_is_inode_opt(id))
+ return -EINVAL;
+
+ inode_opt_id = opt_to_inode_opt(id);
+ if (inode_opt_id < 0)
+ return -EINVAL;
+
+ opt = bch2_opt_table + id;
+
+ if (!bch2_opt_defined_by_id(&opts, id))
+ return -ENODATA;
+
+ if (!all &&
+ !(inode->ei_inode.bi_fields_set & (1 << inode_opt_id)))
+ return -ENODATA;
+
+ v = bch2_opt_get_by_id(&opts, id);
+ bch2_opt_to_text(&out, c, c->disk_sb.sb, opt, v, 0);
+
+ ret = out.pos;
+
+ if (out.allocation_failure) {
+ ret = -ENOMEM;
+ } else if (buffer) {
+ if (out.pos > size)
+ ret = -ERANGE;
+ else
+ memcpy(buffer, out.buf, out.pos);
+ }
+
+ printbuf_exit(&out);
+ return ret;
+}
+
+static int bch2_xattr_bcachefs_get(const struct xattr_handler *handler,
+ struct dentry *dentry, struct inode *vinode,
+ const char *name, void *buffer, size_t size)
+{
+ return __bch2_xattr_bcachefs_get(handler, dentry, vinode,
+ name, buffer, size, false);
+}
+
+struct inode_opt_set {
+ int id;
+ u64 v;
+ bool defined;
+};
+
+static int inode_opt_set_fn(struct bch_inode_info *inode,
+ struct bch_inode_unpacked *bi,
+ void *p)
+{
+ struct inode_opt_set *s = p;
+
+ if (s->defined)
+ bi->bi_fields_set |= 1U << s->id;
+ else
+ bi->bi_fields_set &= ~(1U << s->id);
+
+ bch2_inode_opt_set(bi, s->id, s->v);
+
+ return 0;
+}
+
+static int bch2_xattr_bcachefs_set(const struct xattr_handler *handler,
+ struct user_namespace *mnt_userns,
+ struct dentry *dentry, struct inode *vinode,
+ const char *name, const void *value,
+ size_t size, int flags)
+{
+ struct bch_inode_info *inode = to_bch_ei(vinode);
+ struct bch_fs *c = inode->v.i_sb->s_fs_info;
+ const struct bch_option *opt;
+ char *buf;
+ struct inode_opt_set s;
+ int opt_id, inode_opt_id, ret;
+
+ opt_id = bch2_opt_lookup(name);
+ if (opt_id < 0)
+ return -EINVAL;
+
+ opt = bch2_opt_table + opt_id;
+
+ inode_opt_id = opt_to_inode_opt(opt_id);
+ if (inode_opt_id < 0)
+ return -EINVAL;
+
+ s.id = inode_opt_id;
+
+ if (value) {
+ u64 v = 0;
+
+ buf = kmalloc(size + 1, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+ memcpy(buf, value, size);
+ buf[size] = '\0';
+
+ ret = bch2_opt_parse(c, opt, buf, &v, NULL);
+ kfree(buf);
+
+ if (ret < 0)
+ return ret;
+
+ ret = bch2_opt_check_may_set(c, opt_id, v);
+ if (ret < 0)
+ return ret;
+
+ s.v = v + 1;
+ s.defined = true;
+ } else {
+ if (!IS_ROOT(dentry)) {
+ struct bch_inode_info *dir =
+ to_bch_ei(d_inode(dentry->d_parent));
+
+ s.v = bch2_inode_opt_get(&dir->ei_inode, inode_opt_id);
+ } else {
+ s.v = 0;
+ }
+
+ s.defined = false;
+ }
+
+ mutex_lock(&inode->ei_update_lock);
+ if (inode_opt_id == Inode_opt_project) {
+ /*
+ * inode fields accessible via the xattr interface are stored
+ * with a +1 bias, so that 0 means unset:
+ */
+ ret = bch2_set_projid(c, inode, s.v ? s.v - 1 : 0);
+ if (ret)
+ goto err;
+ }
+
+ ret = bch2_write_inode(c, inode, inode_opt_set_fn, &s, 0);
+err:
+ mutex_unlock(&inode->ei_update_lock);
+
+ if (value &&
+ (opt_id == Opt_background_compression ||
+ opt_id == Opt_background_target))
+ bch2_rebalance_add_work(c, inode->v.i_blocks);
+
+ return ret;
+}
+
+static const struct xattr_handler bch_xattr_bcachefs_handler = {
+ .prefix = "bcachefs.",
+ .get = bch2_xattr_bcachefs_get,
+ .set = bch2_xattr_bcachefs_set,
+};
+
+static int bch2_xattr_bcachefs_get_effective(
+ const struct xattr_handler *handler,
+ struct dentry *dentry, struct inode *vinode,
+ const char *name, void *buffer, size_t size)
+{
+ return __bch2_xattr_bcachefs_get(handler, dentry, vinode,
+ name, buffer, size, true);
+}
+
+static const struct xattr_handler bch_xattr_bcachefs_effective_handler = {
+ .prefix = "bcachefs_effective.",
+ .get = bch2_xattr_bcachefs_get_effective,
+ .set = bch2_xattr_bcachefs_set,