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block/iscsi: only report an iSCSI Failure if we don't handle it gracefully 

we currently report an "iSCSI Failure" in iscsi_co_generic_cb if the task
hasn't completed with SCSI_STATUS_GOOD. However, we expect a failure in
some cases and handle it gracefully. This is the case for misaligned UNMAPs
and WRITESAME10/16 calls without UNMAP. In this case a failure in the
logs can be quite misleading.

While we are at it improve the logging to reveal which operation failed
at what LBA.

Signed-off-by: Peter Lieven <pl@kamp.de>
Message-Id: <1512733868-9009-3-git-send-email-pl@kamp.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Peter Lieven 2017-12-08 12:51:08 +01:00 committed by Paolo Bonzini
parent aef172ffdc
commit e38bc23454
1 changed files with 32 additions and 11 deletions
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43
block/iscsi.c
View File

@ -104,6 +104,7 @@ typedef struct IscsiTask {
IscsiLun *iscsilun;
QEMUTimer retry_timer;
int err_code;
char *err_str;
} IscsiTask;
typedef struct IscsiAIOCB {
@ -265,7 +266,7 @@ iscsi_co_generic_cb(struct iscsi_context *iscsi, int status,
}
}
iTask->err_code = iscsi_translate_sense(&task->sense);
error_report("iSCSI Failure: %s", iscsi_get_error(iscsi));
iTask->err_str = g_strdup(iscsi_get_error(iscsi));
}
out:
@ -629,6 +630,8 @@ retry:
if (iTask.status != SCSI_STATUS_GOOD) {
iscsi_allocmap_set_invalid(iscsilun, sector_num, nb_sectors);
error_report("iSCSI WRITE10/16 failed at lba %" PRIu64 ": %s", lba,
iTask.err_str);
r = iTask.err_code;
goto out_unlock;
}
@ -637,6 +640,7 @@ retry:
out_unlock:
qemu_mutex_unlock(&iscsilun->mutex);
g_free(iTask.err_str);
return r;
}
@ -651,10 +655,9 @@ static int64_t coroutine_fn iscsi_co_get_block_status(BlockDriverState *bs,
struct scsi_get_lba_status *lbas = NULL;
struct scsi_lba_status_descriptor *lbasd = NULL;
struct IscsiTask iTask;
uint64_t lba;
int64_t ret;
iscsi_co_init_iscsitask(iscsilun, &iTask);
if (!is_sector_request_lun_aligned(sector_num, nb_sectors, iscsilun)) {
ret = -EINVAL;
goto out;
@ -670,11 +673,13 @@ static int64_t coroutine_fn iscsi_co_get_block_status(BlockDriverState *bs,
goto out;
}
lba = sector_qemu2lun(sector_num, iscsilun);
iscsi_co_init_iscsitask(iscsilun, &iTask);
qemu_mutex_lock(&iscsilun->mutex);
retry:
if (iscsi_get_lba_status_task(iscsilun->iscsi, iscsilun->lun,
sector_qemu2lun(sector_num, iscsilun),
8 + 16, iscsi_co_generic_cb,
lba, 8 + 16, iscsi_co_generic_cb,
&iTask) == NULL) {
ret = -ENOMEM;
goto out_unlock;
@ -701,6 +706,8 @@ retry:
* because the device is busy or the cmd is not
* supported) we pretend all blocks are allocated
* for backwards compatibility */
error_report("iSCSI GET_LBA_STATUS failed at lba %" PRIu64 ": %s",
lba, iTask.err_str);
goto out_unlock;
}
@ -738,6 +745,7 @@ retry:
}
out_unlock:
qemu_mutex_unlock(&iscsilun->mutex);
g_free(iTask.err_str);
out:
if (iTask.task != NULL) {
scsi_free_scsi_task(iTask.task);
@ -756,6 +764,7 @@ static int coroutine_fn iscsi_co_readv(BlockDriverState *bs,
struct IscsiTask iTask;
uint64_t lba;
uint32_t num_sectors;
int r = 0;
if (!is_sector_request_lun_aligned(sector_num, nb_sectors, iscsilun)) {
return -EINVAL;
@ -853,19 +862,23 @@ retry:
iTask.complete = 0;
goto retry;
}
qemu_mutex_unlock(&iscsilun->mutex);
if (iTask.status != SCSI_STATUS_GOOD) {
return iTask.err_code;
error_report("iSCSI READ10/16 failed at lba %" PRIu64 ": %s",
lba, iTask.err_str);
r = iTask.err_code;
}
return 0;
qemu_mutex_unlock(&iscsilun->mutex);
g_free(iTask.err_str);
return r;
}
static int coroutine_fn iscsi_co_flush(BlockDriverState *bs)
{
IscsiLun *iscsilun = bs->opaque;
struct IscsiTask iTask;
int r = 0;
iscsi_co_init_iscsitask(iscsilun, &iTask);
qemu_mutex_lock(&iscsilun->mutex);
@ -892,13 +905,15 @@ retry:
iTask.complete = 0;
goto retry;
}
qemu_mutex_unlock(&iscsilun->mutex);
if (iTask.status != SCSI_STATUS_GOOD) {
return iTask.err_code;
error_report("iSCSI SYNCHRONIZECACHE10 failed: %s", iTask.err_str);
r = iTask.err_code;
}
return 0;
qemu_mutex_unlock(&iscsilun->mutex);
g_free(iTask.err_str);
return r;
}
#ifdef __linux__
@ -1139,12 +1154,15 @@ retry:
}
if (iTask.status != SCSI_STATUS_GOOD) {
error_report("iSCSI UNMAP failed at lba %" PRIu64 ": %s",
list.lba, iTask.err_str);
r = iTask.err_code;
goto out_unlock;
}
out_unlock:
qemu_mutex_unlock(&iscsilun->mutex);
g_free(iTask.err_str);
return r;
}
@ -1241,6 +1259,8 @@ retry:
if (iTask.status != SCSI_STATUS_GOOD) {
iscsi_allocmap_set_invalid(iscsilun, offset >> BDRV_SECTOR_BITS,
bytes >> BDRV_SECTOR_BITS);
error_report("iSCSI WRITESAME10/16 failed at lba %" PRIu64 ": %s",
lba, iTask.err_str);
r = iTask.err_code;
goto out_unlock;
}
@ -1255,6 +1275,7 @@ retry:
out_unlock:
qemu_mutex_unlock(&iscsilun->mutex);
g_free(iTask.err_str);
return r;
}