static void m25p80_realize(SSISlave *ss, Error **errp) { Flash *s = M25P80(ss); M25P80Class *mc = M25P80_GET_CLASS(s); int ret; s->pi = mc->pi; s->size = s->pi->sector_size * s->pi->n_sectors; s->dirty_page = -1; if (s->blk) { uint64_t perm = BLK_PERM_CONSISTENT_READ | (blk_is_read_only(s->blk) ? 0 : BLK_PERM_WRITE); ret = blk_set_perm(s->blk, perm, BLK_PERM_ALL, errp); if (ret < 0) { return; } DB_PRINT_L(0, "Binding to IF_MTD drive\n"); s->storage = blk_blockalign(s->blk, s->size); if (blk_pread(s->blk, 0, s->storage, s->size) != s->size) { error_setg(errp, "failed to read the initial flash content"); return; } } else { DB_PRINT_L(0, "No BDRV - binding to RAM\n"); s->storage = blk_blockalign(NULL, s->size); memset(s->storage, 0xFF, s->size); } }
bool blkconf_apply_backend_options(BlockConf *conf, bool readonly, bool resizable, Error **errp) { BlockBackend *blk = conf->blk; BlockdevOnError rerror, werror; uint64_t perm, shared_perm; bool wce; int ret; perm = BLK_PERM_CONSISTENT_READ; if (!readonly) { perm |= BLK_PERM_WRITE; } shared_perm = BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE_UNCHANGED | BLK_PERM_GRAPH_MOD; if (resizable) { shared_perm |= BLK_PERM_RESIZE; } if (conf->share_rw) { shared_perm |= BLK_PERM_WRITE; } ret = blk_set_perm(blk, perm, shared_perm, errp); if (ret < 0) { return false; } switch (conf->wce) { case ON_OFF_AUTO_ON: wce = true; break; case ON_OFF_AUTO_OFF: wce = false; break; case ON_OFF_AUTO_AUTO: wce = blk_enable_write_cache(blk); break; default: abort(); } rerror = conf->rerror; if (rerror == BLOCKDEV_ON_ERROR_AUTO) { rerror = blk_get_on_error(blk, true); } werror = conf->werror; if (werror == BLOCKDEV_ON_ERROR_AUTO) { werror = blk_get_on_error(blk, false); } blk_set_enable_write_cache(blk, wce); blk_set_on_error(blk, rerror, werror); return true; }
static void stream_clean(Job *job) { StreamBlockJob *s = container_of(job, StreamBlockJob, common.job); BlockJob *bjob = &s->common; BlockDriverState *bs = blk_bs(bjob->blk); /* Reopen the image back in read-only mode if necessary */ if (s->bs_read_only) { /* Give up write permissions before making it read-only */ blk_set_perm(bjob->blk, 0, BLK_PERM_ALL, &error_abort); bdrv_reopen_set_read_only(bs, true, NULL); } g_free(s->backing_file_str); }
static void mirror_exit(BlockJob *job, void *opaque) { MirrorBlockJob *s = container_of(job, MirrorBlockJob, common); MirrorExitData *data = opaque; AioContext *replace_aio_context = NULL; BlockDriverState *src = s->source; BlockDriverState *target_bs = blk_bs(s->target); BlockDriverState *mirror_top_bs = s->mirror_top_bs; Error *local_err = NULL; bdrv_release_dirty_bitmap(src, s->dirty_bitmap); /* Make sure that the source BDS doesn't go away before we called * block_job_completed(). */ bdrv_ref(src); bdrv_ref(mirror_top_bs); bdrv_ref(target_bs); /* Remove target parent that still uses BLK_PERM_WRITE/RESIZE before * inserting target_bs at s->to_replace, where we might not be able to get * these permissions. * * Note that blk_unref() alone doesn't necessarily drop permissions because * we might be running nested inside mirror_drain(), which takes an extra * reference, so use an explicit blk_set_perm() first. */ blk_set_perm(s->target, 0, BLK_PERM_ALL, &error_abort); blk_unref(s->target); s->target = NULL; /* We don't access the source any more. Dropping any WRITE/RESIZE is * required before it could become a backing file of target_bs. */ bdrv_child_try_set_perm(mirror_top_bs->backing, 0, BLK_PERM_ALL, &error_abort); if (s->backing_mode == MIRROR_SOURCE_BACKING_CHAIN) { BlockDriverState *backing = s->is_none_mode ? src : s->base; if (backing_bs(target_bs) != backing) { bdrv_set_backing_hd(target_bs, backing, &local_err); if (local_err) { error_report_err(local_err); data->ret = -EPERM; } } } if (s->to_replace) { replace_aio_context = bdrv_get_aio_context(s->to_replace); aio_context_acquire(replace_aio_context); } if (s->should_complete && data->ret == 0) { BlockDriverState *to_replace = src; if (s->to_replace) { to_replace = s->to_replace; } if (bdrv_get_flags(target_bs) != bdrv_get_flags(to_replace)) { bdrv_reopen(target_bs, bdrv_get_flags(to_replace), NULL); } /* The mirror job has no requests in flight any more, but we need to * drain potential other users of the BDS before changing the graph. */ bdrv_drained_begin(target_bs); bdrv_replace_node(to_replace, target_bs, &local_err); bdrv_drained_end(target_bs); if (local_err) { error_report_err(local_err); data->ret = -EPERM; } } if (s->to_replace) { bdrv_op_unblock_all(s->to_replace, s->replace_blocker); error_free(s->replace_blocker); bdrv_unref(s->to_replace); } if (replace_aio_context) { aio_context_release(replace_aio_context); } g_free(s->replaces); bdrv_unref(target_bs); /* Remove the mirror filter driver from the graph. Before this, get rid of * the blockers on the intermediate nodes so that the resulting state is * valid. Also give up permissions on mirror_top_bs->backing, which might * block the removal. */ block_job_remove_all_bdrv(job); bdrv_child_try_set_perm(mirror_top_bs->backing, 0, BLK_PERM_ALL, &error_abort); bdrv_replace_node(mirror_top_bs, backing_bs(mirror_top_bs), &error_abort); /* We just changed the BDS the job BB refers to (with either or both of the * bdrv_replace_node() calls), so switch the BB back so the cleanup does * the right thing. We don't need any permissions any more now. */ blk_remove_bs(job->blk); blk_set_perm(job->blk, 0, BLK_PERM_ALL, &error_abort); blk_insert_bs(job->blk, mirror_top_bs, &error_abort); block_job_completed(&s->common, data->ret); g_free(data); bdrv_drained_end(src); bdrv_unref(mirror_top_bs); bdrv_unref(src); }