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error: Fix use of error_prepend() with &error_fatal, &error_abort

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From include/qapi/error.h:

  * Pass an existing error to the caller with the message modified:
  *     error_propagate(errp, err);
  *     error_prepend(errp, "Could not frobnicate '%s': ", name);

Fei Li pointed out that doing error_propagate() first doesn't work
well when @errp is &error_fatal or &error_abort: the error_prepend()
is never reached.

Since I doubt fixing the documentation will stop people from getting
it wrong, introduce error_propagate_prepend(), in the hope that it
lures people away from using its constituents in the wrong order.
Update the instructions in error.h accordingly.

Convert existing error_prepend() next to error_propagate to
error_propagate_prepend().  If any of these get reached with
&error_fatal or &error_abort, the error messages improve.  I didn't
check whether that's the case anywhere.

Cc: Fei Li <fli@suse.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <20181017082702.5581-2-armbru@redhat.com>
This commit is contained in:
Markus Armbruster 2018-10-17 10:26:25 +02:00
parent d7ecf71238
commit 4b5766488f
13 changed files with 61 additions and 33 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
block.c
View File

@ -4697,9 +4697,9 @@ bool bdrv_op_is_blocked(BlockDriverState *bs, BlockOpType op, Error **errp)
assert((int) op >= 0 && op < BLOCK_OP_TYPE_MAX);
if (!QLIST_EMPTY(&bs->op_blockers[op])) {
blocker = QLIST_FIRST(&bs->op_blockers[op]);
error_propagate(errp, error_copy(blocker->reason));
error_prepend(errp, "Node '%s' is busy: ",
bdrv_get_device_or_node_name(bs));
error_propagate_prepend(errp, error_copy(blocker->reason),
"Node '%s' is busy: ",
bdrv_get_device_or_node_name(bs));
return true;
}
return false;

4
block/qcow2.c
View File

@ -2208,8 +2208,8 @@ static void coroutine_fn qcow2_co_invalidate_cache(BlockDriverState *bs,
qemu_co_mutex_unlock(&s->lock);
qobject_unref(options);
if (local_err) {
error_propagate(errp, local_err);
error_prepend(errp, "Could not reopen qcow2 layer: ");
error_propagate_prepend(errp, local_err,
"Could not reopen qcow2 layer: ");
bs->drv = NULL;
return;
} else if (ret < 0) {

4
block/qed.c
View File

@ -1606,8 +1606,8 @@ static void coroutine_fn bdrv_qed_co_invalidate_cache(BlockDriverState *bs,
ret = bdrv_qed_do_open(bs, NULL, bs->open_flags, &local_err);
qemu_co_mutex_unlock(&s->table_lock);
if (local_err) {
error_propagate(errp, local_err);
error_prepend(errp, "Could not reopen qed layer: ");
error_propagate_prepend(errp, local_err,
"Could not reopen qed layer: ");
return;
} else if (ret < 0) {
error_setg_errno(errp, -ret, "Could not reopen qed layer");

4
hw/9pfs/9p-local.c
View File

@ -1509,8 +1509,8 @@ static int local_parse_opts(QemuOpts *opts, FsDriverEntry *fse, Error **errp)
fsdev_throttle_parse_opts(opts, &fse->fst, &local_err);
if (local_err) {
error_propagate(errp, local_err);
error_prepend(errp, "invalid throttle configuration: ");
error_propagate_prepend(errp, local_err,
"invalid throttle configuration: ");
return -1;
}

15
hw/intc/xics.c
View File

@ -320,8 +320,9 @@ static void icp_realize(DeviceState *dev, Error **errp)
obj = object_property_get_link(OBJECT(dev), ICP_PROP_XICS, &err);
if (!obj) {
error_propagate(errp, err);
error_prepend(errp, "required link '" ICP_PROP_XICS "' not found: ");
error_propagate_prepend(errp, err,
"required link '" ICP_PROP_XICS
"' not found: ");
return;
}
@ -329,8 +330,9 @@ static void icp_realize(DeviceState *dev, Error **errp)
obj = object_property_get_link(OBJECT(dev), ICP_PROP_CPU, &err);
if (!obj) {
error_propagate(errp, err);
error_prepend(errp, "required link '" ICP_PROP_CPU "' not found: ");
error_propagate_prepend(errp, err,
"required link '" ICP_PROP_CPU
"' not found: ");
return;
}
@ -624,8 +626,9 @@ static void ics_base_realize(DeviceState *dev, Error **errp)
obj = object_property_get_link(OBJECT(dev), ICS_PROP_XICS, &err);
if (!obj) {
error_propagate(errp, err);
error_prepend(errp, "required link '" ICS_PROP_XICS "' not found: ");
error_propagate_prepend(errp, err,
"required link '" ICS_PROP_XICS
"' not found: ");
return;
}
ics->xics = XICS_FABRIC(obj);

4
hw/ppc/pnv_core.c
View File

@ -148,8 +148,8 @@ static void pnv_core_realize(DeviceState *dev, Error **errp)
chip = object_property_get_link(OBJECT(dev), "chip", &local_err);
if (!chip) {
error_propagate(errp, local_err);
error_prepend(errp, "required link 'chip' not found: ");
error_propagate_prepend(errp, local_err,
"required link 'chip' not found: ");
return;
}

7
hw/ppc/spapr_pci.c
View File

@ -1724,16 +1724,15 @@ static void spapr_phb_realize(DeviceState *dev, Error **errp)
if (smc->legacy_irq_allocation) {
irq = spapr_irq_findone(spapr, &local_err);
if (local_err) {
error_propagate(errp, local_err);
error_prepend(errp, "can't allocate LSIs: ");
error_propagate_prepend(errp, local_err,
"can't allocate LSIs: ");
return;
}
}
spapr_irq_claim(spapr, irq, true, &local_err);
if (local_err) {
error_propagate(errp, local_err);
error_prepend(errp, "can't allocate LSIs: ");
error_propagate_prepend(errp, local_err, "can't allocate LSIs: ");
return;
}

3
hw/timer/aspeed_timer.c
View File

@ -454,8 +454,7 @@ static void aspeed_timer_realize(DeviceState *dev, Error **errp)
obj = object_property_get_link(OBJECT(dev), "scu", &err);
if (!obj) {
error_propagate(errp, err);
error_prepend(errp, "required link 'scu' not found: ");
error_propagate_prepend(errp, err, "required link 'scu' not found: ");
return;
}
s->scu = ASPEED_SCU(obj);

5
hw/usb/bus.c
View File

@ -340,8 +340,9 @@ static USBDevice *usb_try_create_simple(USBBus *bus, const char *name,
}
object_property_set_bool(OBJECT(dev), true, "realized", &err);
if (err) {
error_propagate(errp, err);
error_prepend(errp, "Failed to initialize USB device '%s': ", name);
error_propagate_prepend(errp, err,
"Failed to initialize USB device '%s': ",
name);
return NULL;
}
return dev;

3
hw/vfio/pci.c
View File

@ -1283,8 +1283,7 @@ static int vfio_msi_setup(VFIOPCIDevice *vdev, int pos, Error **errp)
if (ret == -ENOTSUP) {
return 0;
}
error_prepend(&err, "msi_init failed: ");
error_propagate(errp, err);
error_propagate_prepend(errp, err, "msi_init failed: ");
return ret;
}
vdev->msi_cap_size = 0xa + (msi_maskbit ? 0xa : 0) + (msi_64bit ? 0x4 : 0);

14
include/qapi/error.h
View File

@ -52,8 +52,12 @@
* where Error **errp is a parameter, by convention the last one.
*
* Pass an existing error to the caller with the message modified:
* error_propagate_prepend(errp, err);
*
* Avoid
* error_propagate(errp, err);
* error_prepend(errp, "Could not frobnicate '%s': ", name);
* because this fails to prepend when @errp is &error_fatal.
*
* Create a new error and pass it to the caller:
* error_setg(errp, "situation normal, all fouled up");
@ -215,6 +219,16 @@ void error_setg_win32_internal(Error **errp,
*/
void error_propagate(Error **dst_errp, Error *local_err);
/*
* Propagate error object (if any) with some text prepended.
* Behaves like
* error_prepend(&local_err, fmt, ...);
* error_propagate(dst_errp, local_err);
*/
void error_propagate_prepend(Error **dst_errp, Error *local_err,
const char *fmt, ...);
/*
* Prepend some text to @errp's human-readable error message.
* The text is made by formatting @fmt, @ap like vprintf().

12
migration/migration.c
View File

@ -1546,9 +1546,9 @@ static GSList *migration_blockers;
int migrate_add_blocker(Error *reason, Error **errp)
{
if (migrate_get_current()->only_migratable) {
error_propagate(errp, error_copy(reason));
error_prepend(errp, "disallowing migration blocker "
"(--only_migratable) for: ");
error_propagate_prepend(errp, error_copy(reason),
"disallowing migration blocker "
"(--only_migratable) for: ");
return -EACCES;
}
@ -1557,9 +1557,9 @@ int migrate_add_blocker(Error *reason, Error **errp)
return 0;
}
error_propagate(errp, error_copy(reason));
error_prepend(errp, "disallowing migration blocker (migration in "
"progress) for: ");
error_propagate_prepend(errp, error_copy(reason),
"disallowing migration blocker "
"(migration in progress) for: ");
return -EBUSY;
}

13
util/error.c
View File

@ -292,3 +292,16 @@ void error_propagate(Error **dst_errp, Error *local_err)
error_free(local_err);
}
}
void error_propagate_prepend(Error **dst_errp, Error *err,
const char *fmt, ...)
{
va_list ap;
if (dst_errp && !*dst_errp) {
va_start(ap, fmt);
error_vprepend(&err, fmt, ap);
va_end(ap);
} /* else error is being ignored, don't bother with prepending */
error_propagate(dst_errp, err);
}