qemu

FORK: QEMU emulator
git clone https://git.neptards.moe/neptards/qemu.git
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amend.c (4427B)

      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 int blockdev_amend_pre_run(BlockdevAmendJob *s, Error **errp)
     57 {
     58     if (s->bs->drv->bdrv_amend_pre_run) {
     59         return s->bs->drv->bdrv_amend_pre_run(s->bs, errp);
     60     }
     61 
     62     return 0;
     63 }
     64 
     65 static void blockdev_amend_free(Job *job)
     66 {
     67     BlockdevAmendJob *s = container_of(job, BlockdevAmendJob, common);
     68 
     69     if (s->bs->drv->bdrv_amend_clean) {
     70         s->bs->drv->bdrv_amend_clean(s->bs);
     71     }
     72 
     73     bdrv_unref(s->bs);
     74 }
     75 
     76 static const JobDriver blockdev_amend_job_driver = {
     77     .instance_size = sizeof(BlockdevAmendJob),
     78     .job_type      = JOB_TYPE_AMEND,
     79     .run           = blockdev_amend_run,
     80     .free          = blockdev_amend_free,
     81 };
     82 
     83 void qmp_x_blockdev_amend(const char *job_id,
     84                           const char *node_name,
     85                           BlockdevAmendOptions *options,
     86                           bool has_force,
     87                           bool force,
     88                           Error **errp)
     89 {
     90     BlockdevAmendJob *s;
     91     const char *fmt = BlockdevDriver_str(options->driver);
     92     BlockDriver *drv = bdrv_find_format(fmt);
     93     BlockDriverState *bs;
     94 
     95     bs = bdrv_lookup_bs(NULL, node_name, errp);
     96     if (!bs) {
     97         return;
     98     }
     99 
    100     if (!drv) {
    101         error_setg(errp, "Block driver '%s' not found or not supported", fmt);
    102         return;
    103     }
    104 
    105     /*
    106      * If the driver is in the schema, we know that it exists. But it may not
    107      * be whitelisted.
    108      */
    109     if (bdrv_uses_whitelist() && !bdrv_is_whitelisted(drv, false)) {
    110         error_setg(errp, "Driver is not whitelisted");
    111         return;
    112     }
    113 
    114     if (bs->drv != drv) {
    115         error_setg(errp,
    116                    "x-blockdev-amend doesn't support changing the block driver");
    117         return;
    118     }
    119 
    120     /* Error out if the driver doesn't support .bdrv_co_amend */
    121     if (!drv->bdrv_co_amend) {
    122         error_setg(errp, "Driver does not support x-blockdev-amend");
    123         return;
    124     }
    125 
    126     /* Create the block job */
    127     s = job_create(job_id, &blockdev_amend_job_driver, NULL,
    128                    bdrv_get_aio_context(bs), JOB_DEFAULT | JOB_MANUAL_DISMISS,
    129                    NULL, NULL, errp);
    130     if (!s) {
    131         return;
    132     }
    133 
    134     bdrv_ref(bs);
    135     s->bs = bs,
    136     s->opts = QAPI_CLONE(BlockdevAmendOptions, options),
    137     s->force = has_force ? force : false;
    138 
    139     if (blockdev_amend_pre_run(s, errp)) {
    140         job_early_fail(&s->common);
    141         return;
    142     }
    143 
    144     job_start(&s->common);
    145 }