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xemu/qerror.c
Stefan Hajnoczi 02fda01c30 qdev: add blocksize property type 
Storage interfaces like virtio-blk can be configured with block size
information so that the guest can take advantage of efficient I/O
request sizes.

According to the SCSI Block Commands (SBC) standard a device's block
size is "almost always greater than one byte and may be a multiple of
512 bytes".  QEMU currently has a 512 byte minimum block size because
the block layer functions work at that granularity.  Furthermore, the
block size should be a power of 2 because QEMU calculates bitmasks from
the value.

Introduce a "blocksize" property type so devices can enforce these
constraints on block size values.  If the constraints are relaxed in the
future then this property can be updated.

Introduce the new PropertyValueNotPowerOf2 QError so QMP clients know
exactly why a block size value was rejected.

Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-04-05 14:54:40 +02:00

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/*
* QError Module
*
* Copyright (C) 2009 Red Hat Inc.
*
* Authors:
* Luiz Capitulino <lcapitulino@redhat.com>
*
* This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
* See the COPYING.LIB file in the top-level directory.
*/
#include "monitor.h"
#include "qjson.h"
#include "qerror.h"
#include "qemu-common.h"
static void qerror_destroy_obj(QObject *obj);
static const QType qerror_type = {
.code = QTYPE_QERROR,
.destroy = qerror_destroy_obj,
};
/**
* The 'desc' parameter is a printf-like string, the format of the format
* string is:
*
* %(KEY)
*
* Where KEY is a QDict key, which has to be passed to qerror_from_info().
*
* Example:
*
* "foo error on device: %(device) slot: %(slot_nr)"
*
* A single percent sign can be printed if followed by a second one,
* for example:
*
* "running out of foo: %(foo)%%"
*
* Please keep the entries in alphabetical order.
* Use scripts/check-qerror.sh to check.
*/
static const QErrorStringTable qerror_table[] = {
{
.error_fmt = QERR_ADD_CLIENT_FAILED,
.desc = "Could not add client",
},
{
.error_fmt = QERR_AMBIGUOUS_PATH,
.desc = "Path '%(path)' does not uniquely identify a %(object)"
},
{
.error_fmt = QERR_BAD_BUS_FOR_DEVICE,
.desc = "Device '%(device)' can't go on a %(bad_bus_type) bus",
},
{
.error_fmt = QERR_BASE_NOT_FOUND,
.desc = "Base '%(base)' not found",
},
{
.error_fmt = QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED,
.desc = "Block format '%(format)' used by device '%(name)' does not support feature '%(feature)'",
},
{
.error_fmt = QERR_BUS_NO_HOTPLUG,
.desc = "Bus '%(bus)' does not support hotplugging",
},
{
.error_fmt = QERR_BUS_NOT_FOUND,
.desc = "Bus '%(bus)' not found",
},
{
.error_fmt = QERR_COMMAND_DISABLED,
.desc = "The command %(name) has been disabled for this instance",
},
{
.error_fmt = QERR_COMMAND_NOT_FOUND,
.desc = "The command %(name) has not been found",
},
{
.error_fmt = QERR_DEVICE_ENCRYPTED,
.desc = "Device '%(device)' is encrypted",
},
{
.error_fmt = QERR_DEVICE_FEATURE_BLOCKS_MIGRATION,
.desc = "Migration is disabled when using feature '%(feature)' in device '%(device)'",
},
{
.error_fmt = QERR_DEVICE_HAS_NO_MEDIUM,
.desc = "Device '%(device)' has no medium",
},
{
.error_fmt = QERR_DEVICE_INIT_FAILED,
.desc = "Device '%(device)' could not be initialized",
},
{
.error_fmt = QERR_DEVICE_IN_USE,
.desc = "Device '%(device)' is in use",
},
{
.error_fmt = QERR_DEVICE_IS_READ_ONLY,
.desc = "Device '%(device)' is read only",
},
{
.error_fmt = QERR_DEVICE_LOCKED,
.desc = "Device '%(device)' is locked",
},
{
.error_fmt = QERR_DEVICE_MULTIPLE_BUSSES,
.desc = "Device '%(device)' has multiple child busses",
},
{
.error_fmt = QERR_DEVICE_NO_BUS,
.desc = "Device '%(device)' has no child bus",
},
{
.error_fmt = QERR_DEVICE_NO_HOTPLUG,
.desc = "Device '%(device)' does not support hotplugging",
},
{
.error_fmt = QERR_DEVICE_NOT_ACTIVE,
.desc = "Device '%(device)' has not been activated",
},
{
.error_fmt = QERR_DEVICE_NOT_ENCRYPTED,
.desc = "Device '%(device)' is not encrypted",
},
{
.error_fmt = QERR_DEVICE_NOT_FOUND,
.desc = "Device '%(device)' not found",
},
{
.error_fmt = QERR_DEVICE_NOT_REMOVABLE,
.desc = "Device '%(device)' is not removable",
},
{
.error_fmt = QERR_DUPLICATE_ID,
.desc = "Duplicate ID '%(id)' for %(object)",
},
{
.error_fmt = QERR_FD_NOT_FOUND,
.desc = "File descriptor named '%(name)' not found",
},
{
.error_fmt = QERR_FD_NOT_SUPPLIED,
.desc = "No file descriptor supplied via SCM_RIGHTS",
},
{
.error_fmt = QERR_FEATURE_DISABLED,
.desc = "The feature '%(name)' is not enabled",
},
{
.error_fmt = QERR_INVALID_BLOCK_FORMAT,
.desc = "Invalid block format '%(name)'",
},
{
.error_fmt = QERR_INVALID_PARAMETER,
.desc = "Invalid parameter '%(name)'",
},
{
.error_fmt = QERR_INVALID_PARAMETER_COMBINATION,
.desc = "Invalid parameter combination",
},
{
.error_fmt = QERR_INVALID_PARAMETER_TYPE,
.desc = "Invalid parameter type for '%(name)', expected: %(expected)",
},
{
.error_fmt = QERR_INVALID_PARAMETER_VALUE,
.desc = "Parameter '%(name)' expects %(expected)",
},
{
.error_fmt = QERR_INVALID_PASSWORD,
.desc = "Password incorrect",
},
{
.error_fmt = QERR_IO_ERROR,
.desc = "An IO error has occurred",
},
{
.error_fmt = QERR_JSON_PARSE_ERROR,
.desc = "JSON parse error, %(message)",
},
{
.error_fmt = QERR_JSON_PARSING,
.desc = "Invalid JSON syntax",
},
{
.error_fmt = QERR_KVM_MISSING_CAP,
.desc = "Using KVM without %(capability), %(feature) unavailable",
},
{
.error_fmt = QERR_MIGRATION_ACTIVE,
.desc = "There's a migration process in progress",
},
{
.error_fmt = QERR_MIGRATION_NOT_SUPPORTED,
.desc = "State blocked by non-migratable device '%(device)'",
},
{
.error_fmt = QERR_MIGRATION_EXPECTED,
.desc = "An incoming migration is expected before this command can be executed",
},
{
.error_fmt = QERR_MISSING_PARAMETER,
.desc = "Parameter '%(name)' is missing",
},
{
.error_fmt = QERR_NO_BUS_FOR_DEVICE,
.desc = "No '%(bus)' bus found for device '%(device)'",
},
{
.error_fmt = QERR_NOT_SUPPORTED,
.desc = "Not supported",
},
{
.error_fmt = QERR_OPEN_FILE_FAILED,
.desc = "Could not open '%(filename)'",
},
{
.error_fmt = QERR_PERMISSION_DENIED,
.desc = "Insufficient permission to perform this operation",
},
{
.error_fmt = QERR_PROPERTY_NOT_FOUND,
.desc = "Property '%(device).%(property)' not found",
},
{
.error_fmt = QERR_PROPERTY_VALUE_BAD,
.desc = "Property '%(device).%(property)' doesn't take value '%(value)'",
},
{
.error_fmt = QERR_PROPERTY_VALUE_IN_USE,
.desc = "Property '%(device).%(property)' can't take value '%(value)', it's in use",
},
{
.error_fmt = QERR_PROPERTY_VALUE_NOT_FOUND,
.desc = "Property '%(device).%(property)' can't find value '%(value)'",
},
{
.error_fmt = QERR_PROPERTY_VALUE_NOT_POWER_OF_2,
.desc = "Property '%(device).%(property)' doesn't take "
"value '%(value)', it's not a power of 2",
},
{
.error_fmt = QERR_PROPERTY_VALUE_OUT_OF_RANGE,
.desc = "Property '%(device).%(property)' doesn't take "
"value %(value) (minimum: %(min), maximum: %(max))",
},
{
.error_fmt = QERR_QGA_COMMAND_FAILED,
.desc = "Guest agent command failed, error was '%(message)'",
},
{
.error_fmt = QERR_QGA_LOGGING_FAILED,
.desc = "Guest agent failed to log non-optional log statement",
},
{
.error_fmt = QERR_QMP_BAD_INPUT_OBJECT,
.desc = "Expected '%(expected)' in QMP input",
},
{
.error_fmt = QERR_QMP_BAD_INPUT_OBJECT_MEMBER,
.desc = "QMP input object member '%(member)' expects '%(expected)'",
},
{
.error_fmt = QERR_QMP_EXTRA_MEMBER,
.desc = "QMP input object member '%(member)' is unexpected",
},
{
.error_fmt = QERR_RESET_REQUIRED,
.desc = "Resetting the Virtual Machine is required",
},
{
.error_fmt = QERR_SET_PASSWD_FAILED,
.desc = "Could not set password",
},
{
.error_fmt = QERR_TOO_MANY_FILES,
.desc = "Too many open files",
},
{
.error_fmt = QERR_UNDEFINED_ERROR,
.desc = "An undefined error has occurred",
},
{
.error_fmt = QERR_UNKNOWN_BLOCK_FORMAT_FEATURE,
.desc = "'%(device)' uses a %(format) feature which is not "
"supported by this qemu version: %(feature)",
},
{
.error_fmt = QERR_UNSUPPORTED,
.desc = "this feature or command is not currently supported",
},
{
.error_fmt = QERR_VIRTFS_FEATURE_BLOCKS_MIGRATION,
.desc = "Migration is disabled when VirtFS export path '%(path)' "
"is mounted in the guest using mount_tag '%(tag)'",
},
{
.error_fmt = QERR_VNC_SERVER_FAILED,
.desc = "Could not start VNC server on %(target)",
},
{}
};
/**
* qerror_new(): Create a new QError
*
* Return strong reference.
*/
QError *qerror_new(void)
{
QError *qerr;
qerr = g_malloc0(sizeof(*qerr));
QOBJECT_INIT(qerr, &qerror_type);
return qerr;
}
static void GCC_FMT_ATTR(2, 3) qerror_abort(const QError *qerr,
const char *fmt, ...)
{
va_list ap;
fprintf(stderr, "qerror: bad call in function '%s':\n", qerr->func);
fprintf(stderr, "qerror: -> ");
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
fprintf(stderr, "\nqerror: call at %s:%d\n", qerr->file, qerr->linenr);
abort();
}
static void GCC_FMT_ATTR(2, 0) qerror_set_data(QError *qerr,
const char *fmt, va_list *va)
{
QObject *obj;
obj = qobject_from_jsonv(fmt, va);
if (!obj) {
qerror_abort(qerr, "invalid format '%s'", fmt);
}
if (qobject_type(obj) != QTYPE_QDICT) {
qerror_abort(qerr, "error format is not a QDict '%s'", fmt);
}
qerr->error = qobject_to_qdict(obj);
obj = qdict_get(qerr->error, "class");
if (!obj) {
qerror_abort(qerr, "missing 'class' key in '%s'", fmt);
}
if (qobject_type(obj) != QTYPE_QSTRING) {
qerror_abort(qerr, "'class' key value should be a QString");
}
obj = qdict_get(qerr->error, "data");
if (!obj) {
qerror_abort(qerr, "missing 'data' key in '%s'", fmt);
}
if (qobject_type(obj) != QTYPE_QDICT) {
qerror_abort(qerr, "'data' key value should be a QDICT");
}
}
static void qerror_set_desc(QError *qerr, const char *fmt)
{
int i;
// FIXME: inefficient loop
for (i = 0; qerror_table[i].error_fmt; i++) {
if (strcmp(qerror_table[i].error_fmt, fmt) == 0) {
qerr->entry = &qerror_table[i];
return;
}
}
qerror_abort(qerr, "error format '%s' not found", fmt);
}
/**
* qerror_from_info(): Create a new QError from error information
*
* The information consists of:
*
* - file the file name of where the error occurred
* - linenr the line number of where the error occurred
* - func the function name of where the error occurred
* - fmt JSON printf-like dictionary, there must exist keys 'class' and
* 'data'
* - va va_list of all arguments specified by fmt
*
* Return strong reference.
*/
QError *qerror_from_info(const char *file, int linenr, const char *func,
const char *fmt, va_list *va)
{
QError *qerr;
qerr = qerror_new();
loc_save(&qerr->loc);
qerr->linenr = linenr;
qerr->file = file;
qerr->func = func;
if (!fmt) {
qerror_abort(qerr, "QDict not specified");
}
qerror_set_data(qerr, fmt, va);
qerror_set_desc(qerr, fmt);
return qerr;
}
static void parse_error(const QErrorStringTable *entry, int c)
{
fprintf(stderr, "expected '%c' in '%s'", c, entry->desc);
abort();
}
static const char *append_field(QDict *error, QString *outstr,
const QErrorStringTable *entry,
const char *start)
{
QObject *obj;
QDict *qdict;
QString *key_qs;
const char *end, *key;
if (*start != '%')
parse_error(entry, '%');
start++;
if (*start != '(')
parse_error(entry, '(');
start++;
end = strchr(start, ')');
if (!end)
parse_error(entry, ')');
key_qs = qstring_from_substr(start, 0, end - start - 1);
key = qstring_get_str(key_qs);
qdict = qobject_to_qdict(qdict_get(error, "data"));
obj = qdict_get(qdict, key);
if (!obj) {
abort();
}
switch (qobject_type(obj)) {
case QTYPE_QSTRING:
qstring_append(outstr, qdict_get_str(qdict, key));
break;
case QTYPE_QINT:
qstring_append_int(outstr, qdict_get_int(qdict, key));
break;
default:
abort();
}
QDECREF(key_qs);
return ++end;
}
static QString *qerror_format_desc(QDict *error,
const QErrorStringTable *entry)
{
QString *qstring;
const char *p;
assert(entry != NULL);
qstring = qstring_new();
for (p = entry->desc; *p != '\0';) {
if (*p != '%') {
qstring_append_chr(qstring, *p++);
} else if (*(p + 1) == '%') {
qstring_append_chr(qstring, '%');
p += 2;
} else {
p = append_field(error, qstring, entry, p);
}
}
return qstring;
}
QString *qerror_format(const char *fmt, QDict *error)
{
const QErrorStringTable *entry = NULL;
int i;
for (i = 0; qerror_table[i].error_fmt; i++) {
if (strcmp(qerror_table[i].error_fmt, fmt) == 0) {
entry = &qerror_table[i];
break;
}
}
return qerror_format_desc(error, entry);
}
/**
* qerror_human(): Format QError data into human-readable string.
*/
QString *qerror_human(const QError *qerror)
{
return qerror_format_desc(qerror->error, qerror->entry);
}
/**
* qerror_print(): Print QError data
*
* This function will print the member 'desc' of the specified QError object,
* it uses error_report() for this, so that the output is routed to the right
* place (ie. stderr or Monitor's device).
*/
void qerror_print(QError *qerror)
{
QString *qstring = qerror_human(qerror);
loc_push_restore(&qerror->loc);
error_report("%s", qstring_get_str(qstring));
loc_pop(&qerror->loc);
QDECREF(qstring);
}
void qerror_report_internal(const char *file, int linenr, const char *func,
const char *fmt, ...)
{
va_list va;
QError *qerror;
va_start(va, fmt);
qerror = qerror_from_info(file, linenr, func, fmt, &va);
va_end(va);
if (monitor_cur_is_qmp()) {
monitor_set_error(cur_mon, qerror);
} else {
qerror_print(qerror);
QDECREF(qerror);
}
}
/* Evil... */
struct Error
{
QDict *obj;
const char *fmt;
char *msg;
};
void qerror_report_err(Error *err)
{
QError *qerr;
int i;
qerr = qerror_new();
loc_save(&qerr->loc);
QINCREF(err->obj);
qerr->error = err->obj;
for (i = 0; qerror_table[i].error_fmt; i++) {
if (strcmp(qerror_table[i].error_fmt, err->fmt) == 0) {
qerr->entry = &qerror_table[i];
break;
}
}
if (monitor_cur_is_qmp()) {
monitor_set_error(cur_mon, qerr);
} else {
qerror_print(qerr);
QDECREF(qerr);
}
}
void assert_no_error(Error *err)
{
if (err) {
qerror_report_err(err);
abort();
}
}
/**
* qobject_to_qerror(): Convert a QObject into a QError
*/
QError *qobject_to_qerror(const QObject *obj)
{
if (qobject_type(obj) != QTYPE_QERROR) {
return NULL;
}
return container_of(obj, QError, base);
}
/**
* qerror_destroy_obj(): Free all memory allocated by a QError
*/
static void qerror_destroy_obj(QObject *obj)
{
QError *qerr;
assert(obj != NULL);
qerr = qobject_to_qerror(obj);
QDECREF(qerr->error);
g_free(qerr);
}
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