+long bch2_fallocate_dispatch(struct file *file, int mode,
+ loff_t offset, loff_t len)
+{
+ struct bch_inode_info *inode = file_bch_inode(file);
+ struct bch_fs *c = inode->v.i_sb->s_fs_info;
+ long ret;
+
+ if (!percpu_ref_tryget_live(&c->writes))
+ return -EROFS;
+
+ inode_lock(&inode->v);
+ inode_dio_wait(&inode->v);
+ bch2_pagecache_block_get(&inode->ei_pagecache_lock);
+
+ ret = file_modified(file);
+ if (ret)
+ goto err;
+
+ if (!(mode & ~(FALLOC_FL_KEEP_SIZE|FALLOC_FL_ZERO_RANGE)))
+ ret = bchfs_fallocate(inode, mode, offset, len);
+ else if (mode == (FALLOC_FL_PUNCH_HOLE|FALLOC_FL_KEEP_SIZE))
+ ret = bchfs_fpunch(inode, offset, len);
+ else if (mode == FALLOC_FL_INSERT_RANGE)
+ ret = bchfs_fcollapse_finsert(inode, offset, len, true);
+ else if (mode == FALLOC_FL_COLLAPSE_RANGE)
+ ret = bchfs_fcollapse_finsert(inode, offset, len, false);
+ else
+ ret = -EOPNOTSUPP;
+err:
+ bch2_pagecache_block_put(&inode->ei_pagecache_lock);
+ inode_unlock(&inode->v);
+ percpu_ref_put(&c->writes);
+
+ return bch2_err_class(ret);
+}
+
+static int quota_reserve_range(struct bch_inode_info *inode,
+ struct quota_res *res,
+ u64 start, u64 end)
+{
+ struct bch_fs *c = inode->v.i_sb->s_fs_info;
+ struct btree_trans trans;
+ struct btree_iter iter;
+ struct bkey_s_c k;
+ u32 snapshot;
+ u64 sectors = end - start;
+ u64 pos = start;
+ int ret;
+
+ bch2_trans_init(&trans, c, 0, 0);
+retry:
+ bch2_trans_begin(&trans);
+
+ ret = bch2_subvolume_get_snapshot(&trans, inode->ei_subvol, &snapshot);
+ if (ret)
+ goto err;
+
+ bch2_trans_iter_init(&trans, &iter, BTREE_ID_extents,
+ SPOS(inode->v.i_ino, pos, snapshot), 0);
+
+ while (!(ret = btree_trans_too_many_iters(&trans)) &&
+ (k = bch2_btree_iter_peek_upto(&iter, POS(inode->v.i_ino, end - 1))).k &&
+ !(ret = bkey_err(k))) {
+ if (bkey_extent_is_allocation(k.k)) {
+ u64 s = min(end, k.k->p.offset) -
+ max(start, bkey_start_offset(k.k));
+ BUG_ON(s > sectors);
+ sectors -= s;