io_uring: make fallocate be hashed work

Like ftruncate and write, fallocate operations on the same file cannot
be executed in parallel, so it is better to make fallocate be hashed
work.

Signed-off-by: Fengnan Chang <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jens Axboe <[email protected]>

Author: Fengnan Chang

io_uring/opdef.c

@@ -216,6 +216,7 @@ const struct io_issue_def io_issue_defs[] = {
 	},
 	[IORING_OP_FALLOCATE] = {
 		.needs_file		= 1,
+		.hash_reg_file          = 1,
 		.prep			= io_fallocate_prep,
 		.issue			= io_fallocate,
 	},