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
  37 typedef struct BlockdevAmendJob {
  38     Job common;
  39     BlockdevAmendOptions *opts;
  40     BlockDriverState *bs;
  41     bool force;
  42 } BlockdevAmendJob;
  43
  44 static 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
  56 static const JobDriver blockdev_amend_job_driver = {
  57     .instance_size = sizeof(BlockdevAmendJob),
  58     .job_type      = JOB_TYPE_AMEND,
  59     .run           = blockdev_amend_run,
  60 };
  61
  62 void 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 }