I have a question on requeue_io_u. Code source lines reference here are from version fio-2.1.2.
Does a requeued io_u work get submitted again through __get_io_u() ? If so, the io_u item is taken out of requeue list & then the io_u->file is set to NULL. We don't make a distinction about item being already setup Vs a new io_u in __get_io_u(). In get_io_u(), when an io_u may come out of requeue list, we depend on io_u->file to be non NULL to detect the work as old pending one.
Am I missing something here or is this a bug?
1274 io_u = __get_io_u(td);
1275 if (!io_u) {
1276 dprint(FD_IO, "__get_io_u failed\n");
1277 return NULL;
1278 }
1279
1280 if (check_get_verify(td, io_u))
1281 goto out;
1282 if (check_get_trim(td, io_u))
1283 goto out;
1284
1285 /*
1286 * from a requeue, io_u already setup
1287 */
1288 if (io_u->file)
1289 goto out;
1290
"io_u.c" line 1286 of 1667 --77%-- col 3-10
1130 struct io_u *__get_io_u(struct thread_data *td)
1131 {
1132 struct io_u *io_u;
1133
1134 td_io_u_lock(td);
1135
1136 again:
1137 if (!io_u_rempty(&td->io_u_requeues))
1138 io_u = io_u_rpop(&td->io_u_requeues);
1139 else if (!io_u_qempty(&td->io_u_freelist))
1140 io_u = io_u_qpop(&td->io_u_freelist);
1141
1142 if (io_u) {
1143 io_u->buflen = 0;
1144 io_u->resid = 0;
1145 io_u->file = NULL;
1146 io_u->end_io = NULL;
1147 }
"io_u.c" line 1130 of 1667 --67%-- col 1
Thanks,
Suresh --
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