LXR qemu/block/amend.c

   1/*
   2 * Block layer code related to image options amend
   3 *
   4 * Copyright (c) 2018 Kevin Wolf <kwolf@redhat.com>
   5 * Copyright (c) 2020 Red Hat. Inc
   6 *
   7 * Heavily based on create.c
   8 *
   9 * Permission is hereby granted, free of charge, to any person obtaining a copy
  10 * of this software and associated documentation files (the "Software"), to deal
  11 * in the Software without restriction, including without limitation the rights
  12 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  13 * copies of the Software, and to permit persons to whom the Software is
  14 * furnished to do so, subject to the following conditions:
  15 *
  16 * The above copyright notice and this permission notice shall be included in
  17 * all copies or substantial portions of the Software.
  18 *
  19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  22 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  23 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  24 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  25 * THE SOFTWARE.
  26 */
  27
  28#include "qemu/osdep.h"
  29#include "block/block_int.h"
  30#include "qemu/job.h"
  31#include "qemu/main-loop.h"
  32#include "qapi/qapi-commands-block-core.h"
  33#include "qapi/qapi-visit-block-core.h"
  34#include "qapi/clone-visitor.h"
  35#include "qapi/error.h"
  36
  37typedef struct BlockdevAmendJob {
  38    Job common;
  39    BlockdevAmendOptions *opts;
  40    BlockDriverState *bs;
  41    bool force;
  42} BlockdevAmendJob;
  43
  44static int coroutine_fn blockdev_amend_run(Job *job, Error **errp)
  45{
  46    BlockdevAmendJob *s = container_of(job, BlockdevAmendJob, common);
  47    int ret;
  48
  49    job_progress_set_remaining(&s->common, 1);
  50    ret = s->bs->drv->bdrv_co_amend(s->bs, s->opts, s->force, errp);
  51    job_progress_update(&s->common, 1);
  52    qapi_free_BlockdevAmendOptions(s->opts);
  53    return ret;
  54}
  55
  56static const JobDriver blockdev_amend_job_driver = {
  57    .instance_size = sizeof(BlockdevAmendJob),
  58    .job_type      = JOB_TYPE_AMEND,
  59    .run           = blockdev_amend_run,
  60};
  61
  62void qmp_x_blockdev_amend(const char *job_id,
  63                          const char *node_name,
  64                          BlockdevAmendOptions *options,
  65                          bool has_force,
  66                          bool force,
  67                          Error **errp)
  68{
  69    BlockdevAmendJob *s;
  70    const char *fmt = BlockdevDriver_str(options->driver);
  71    BlockDriver *drv = bdrv_find_format(fmt);
  72    BlockDriverState *bs;
  73
  74    bs = bdrv_lookup_bs(NULL, node_name, errp);
  75    if (!bs) {
  76        return;
  77    }
  78
  79    if (!drv) {
  80        error_setg(errp, "Block driver '%s' not found or not supported", fmt);
  81        return;
  82    }
  83
  84    /*
  85     * If the driver is in the schema, we know that it exists. But it may not
  86     * be whitelisted.
  87     */
  88    if (bdrv_uses_whitelist() && !bdrv_is_whitelisted(drv, false)) {
  89        error_setg(errp, "Driver is not whitelisted");
  90        return;
  91    }
  92
  93    if (bs->drv != drv) {
  94        error_setg(errp,
  95                   "x-blockdev-amend doesn't support changing the block driver");
  96        return;
  97    }
  98
  99    /* Error out if the driver doesn't support .bdrv_co_amend */
 100    if (!drv->bdrv_co_amend) {
 101        error_setg(errp, "Driver does not support x-blockdev-amend");
 102        return;
 103    }
 104
 105    /* Create the block job */
 106    s = job_create(job_id, &blockdev_amend_job_driver, NULL,
 107                   bdrv_get_aio_context(bs), JOB_DEFAULT | JOB_MANUAL_DISMISS,
 108                   NULL, NULL, errp);
 109    if (!s) {
 110        return;
 111    }
 112
 113    s->bs = bs,
 114    s->opts = QAPI_CLONE(BlockdevAmendOptions, options),
 115    s->force = has_force ? force : false;
 116    job_start(&s->common);
 117}
 118