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libiscsi: Avoid discontinuities in cmdsn ordering in some cases

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We should plug the cmdsn gap in order to continue
to use the session when the pdus is cancelled before
sending out.

Signed-off-by: Xie Yongji <xieyongji@bytedance.com>
This commit is contained in:
Xie Yongji
2020-06-02 20:15:50 +08:00
parent 7258fbfd83
commit 10868c491d
3 changed files with 39 additions and 5 deletions
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15
lib/pdu.c
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@@ -719,10 +719,14 @@ iscsi_timeout_scan(struct iscsi_context *iscsi)
struct iscsi_pdu *pdu;
struct iscsi_pdu *next_pdu;
time_t t = time(NULL);
uint32_t cmdsn_gap = 0;
for (pdu = iscsi->outqueue; pdu; pdu = next_pdu) {
next_pdu = pdu->next;
if (cmdsn_gap > 0) {
iscsi_pdu_set_cmdsn(pdu, pdu->cmdsn - cmdsn_gap);
}
if (pdu->scsi_timeout == 0) {
/* no timeout for this pdu */
continue;
@@ -731,6 +735,11 @@ iscsi_timeout_scan(struct iscsi_context *iscsi)
/* not expired yet */
continue;
}
if (!(pdu->outdata.data[0] & ISCSI_PDU_IMMEDIATE) &&
(pdu->outdata.data[0] & 0x3f) != ISCSI_PDU_DATA_OUT) {
iscsi->cmdsn--;
cmdsn_gap++;
}
ISCSI_LIST_REMOVE(&iscsi->outqueue, pdu);
iscsi_set_error(iscsi, "command timed out");
iscsi_dump_pdu_header(iscsi, pdu->outdata.data);
@@ -783,6 +792,12 @@ iscsi_cancel_pdus(struct iscsi_context *iscsi)
NULL, pdu->private_data);
}
iscsi->drv->free_pdu(iscsi, pdu);
if (!(pdu->outdata.data[0] & ISCSI_PDU_IMMEDIATE) &&
(pdu->outdata.data[0] & 0x3f) != ISCSI_PDU_DATA_OUT) {
iscsi->cmdsn--;
}
}
while ((pdu = iscsi->waitpdu)) {
ISCSI_LIST_REMOVE(&iscsi->waitpdu, pdu);