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block: Add error parameter to blk_insert_bs() 

Now that blk_insert_bs() requests the BlockBackend permissions for the
node it attaches to, it can fail. Instead of aborting, pass the errors
to the callers.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Acked-by: Fam Zheng <famz@redhat.com>
This commit is contained in:
Kevin Wolf 2017-01-13 19:02:32 +01:00
parent 6d0eb64d5c
commit d7086422b1
14 changed files with 100 additions and 29 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
block.c
View File

@ -2194,8 +2194,11 @@ static BlockDriverState *bdrv_open_inherit(const char *filename,
}
if (file_bs != NULL) {
file = blk_new(BLK_PERM_CONSISTENT_READ, BLK_PERM_ALL);
blk_insert_bs(file, file_bs);
blk_insert_bs(file, file_bs, &local_err);
bdrv_unref(file_bs);
if (local_err) {
goto fail;
}
qdict_put(options, "file",
qstring_from_str(bdrv_get_node_name(file_bs)));

5
block/backup.c
View File

@ -626,7 +626,10 @@ BlockJob *backup_job_create(const char *job_id, BlockDriverState *bs,
/* FIXME Use real permissions */
job->target = blk_new(0, BLK_PERM_ALL);
blk_insert_bs(job->target, target);
ret = blk_insert_bs(job->target, target, errp);
if (ret < 0) {
goto error;
}
job->on_source_error = on_source_error;
job->on_target_error = on_target_error;

13
block/block-backend.c
View File

@ -508,19 +508,22 @@ void blk_remove_bs(BlockBackend *blk)
/*
* Associates a new BlockDriverState with @blk.
*/
void blk_insert_bs(BlockBackend *blk, BlockDriverState *bs)
int blk_insert_bs(BlockBackend *blk, BlockDriverState *bs, Error **errp)
{
bdrv_ref(bs);
/* FIXME Error handling */
blk->root = bdrv_root_attach_child(bs, "root", &child_root,
blk->perm, blk->shared_perm, blk,
&error_abort);
blk->perm, blk->shared_perm, blk, errp);
if (blk->root == NULL) {
return -EPERM;
}
bdrv_ref(bs);
notifier_list_notify(&blk->insert_bs_notifiers, blk);
if (blk->public.throttle_state) {
throttle_timers_attach_aio_context(
&blk->public.throttle_timers, bdrv_get_aio_context(bs));
}
return 0;
}
/*

38
block/commit.c
View File

@ -220,6 +220,7 @@ void commit_start(const char *job_id, BlockDriverState *bs,
BlockDriverState *iter;
BlockDriverState *overlay_bs;
Error *local_err = NULL;
int ret;
assert(top != bs);
if (top == base) {
@ -256,8 +257,7 @@ void commit_start(const char *job_id, BlockDriverState *bs,
bdrv_reopen_multiple(bdrv_get_aio_context(bs), reopen_queue, &local_err);
if (local_err != NULL) {
error_propagate(errp, local_err);
block_job_unref(&s->common);
return;
goto fail;
}
}
@ -277,11 +277,17 @@ void commit_start(const char *job_id, BlockDriverState *bs,
/* FIXME Use real permissions */
s->base = blk_new(0, BLK_PERM_ALL);
blk_insert_bs(s->base, base);
ret = blk_insert_bs(s->base, base, errp);
if (ret < 0) {
goto fail;
}
/* FIXME Use real permissions */
s->top = blk_new(0, BLK_PERM_ALL);
blk_insert_bs(s->top, top);
ret = blk_insert_bs(s->top, top, errp);
if (ret < 0) {
goto fail;
}
s->active = bs;
@ -294,6 +300,16 @@ void commit_start(const char *job_id, BlockDriverState *bs,
trace_commit_start(bs, base, top, s);
block_job_start(&s->common);
return;
fail:
if (s->base) {
blk_unref(s->base);
}
if (s->top) {
blk_unref(s->top);
}
block_job_unref(&s->common);
}
@ -332,11 +348,17 @@ int bdrv_commit(BlockDriverState *bs)
/* FIXME Use real permissions */
src = blk_new(0, BLK_PERM_ALL);
blk_insert_bs(src, bs);
/* FIXME Use real permissions */
backing = blk_new(0, BLK_PERM_ALL);
blk_insert_bs(backing, bs->backing->bs);
ret = blk_insert_bs(src, bs, NULL);
if (ret < 0) {
goto ro_cleanup;
}
ret = blk_insert_bs(backing, bs->backing->bs, NULL);
if (ret < 0) {
goto ro_cleanup;
}
length = blk_getlength(src);
if (length < 0) {

15
block/mirror.c
View File

@ -525,9 +525,12 @@ static void mirror_exit(BlockJob *job, void *opaque)
bdrv_replace_in_backing_chain(to_replace, target_bs);
bdrv_drained_end(target_bs);
/* We just changed the BDS the job BB refers to */
/* We just changed the BDS the job BB refers to, 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_insert_bs(job->blk, src);
blk_set_perm(job->blk, 0, BLK_PERM_ALL, &error_abort);
blk_insert_bs(job->blk, src, &error_abort);
}
if (s->to_replace) {
bdrv_op_unblock_all(s->to_replace, s->replace_blocker);
@ -995,6 +998,7 @@ static void mirror_start_job(const char *job_id, BlockDriverState *bs,
bool auto_complete)
{
MirrorBlockJob *s;
int ret;
if (granularity == 0) {
granularity = bdrv_get_default_bitmap_granularity(target);
@ -1019,7 +1023,12 @@ static void mirror_start_job(const char *job_id, BlockDriverState *bs,
/* FIXME Use real permissions */
s->target = blk_new(0, BLK_PERM_ALL);
blk_insert_bs(s->target, target);
ret = blk_insert_bs(s->target, target, errp);
if (ret < 0) {
blk_unref(s->target);
block_job_unref(&s->common);
return;
}
s->replaces = g_strdup(replaces);
s->on_source_error = on_source_error;

10
block/qcow2.c
View File

@ -3113,6 +3113,7 @@ static int qcow2_amend_options(BlockDriverState *bs, QemuOpts *opts,
uint64_t cluster_size = s->cluster_size;
bool encrypt;
int refcount_bits = s->refcount_bits;
Error *local_err = NULL;
int ret;
QemuOptDesc *desc = opts->list->desc;
Qcow2AmendHelperCBInfo helper_cb_info;
@ -3263,10 +3264,15 @@ static int qcow2_amend_options(BlockDriverState *bs, QemuOpts *opts,
if (new_size) {
BlockBackend *blk = blk_new(BLK_PERM_RESIZE, BLK_PERM_ALL);
blk_insert_bs(blk, bs);
ret = blk_insert_bs(blk, bs, &local_err);
if (ret < 0) {
error_report_err(local_err);
blk_unref(blk);
return ret;
}
ret = blk_truncate(blk, new_size);
blk_unref(blk);
if (ret < 0) {
return ret;
}

11
blockdev.c
View File

@ -2436,6 +2436,7 @@ static void qmp_blockdev_insert_anon_medium(BlockBackend *blk,
BlockDriverState *bs, Error **errp)
{
bool has_device;
int ret;
/* For BBs without a device, we can exchange the BDS tree at will */
has_device = blk_get_attached_dev(blk);
@ -2455,7 +2456,10 @@ static void qmp_blockdev_insert_anon_medium(BlockBackend *blk,
return;
}
blk_insert_bs(blk, bs);
ret = blk_insert_bs(blk, bs, errp);
if (ret < 0) {
return;
}
if (!blk_dev_has_tray(blk)) {
/* For tray-less devices, blockdev-close-tray is a no-op (or may not be
@ -2891,7 +2895,10 @@ void qmp_block_resize(bool has_device, const char *device,
}
blk = blk_new(BLK_PERM_RESIZE, BLK_PERM_ALL);
blk_insert_bs(blk, bs);
ret = blk_insert_bs(blk, bs, errp);
if (ret < 0) {
goto out;
}
/* complete all in-flight operations before resizing the device */
bdrv_drain_all();

7
blockjob.c
View File

@ -128,6 +128,7 @@ void *block_job_create(const char *job_id, const BlockJobDriver *driver,
{
BlockBackend *blk;
BlockJob *job;
int ret;
if (bs->job) {
error_setg(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs));
@ -161,7 +162,11 @@ void *block_job_create(const char *job_id, const BlockJobDriver *driver,
/* FIXME Use real permissions */
blk = blk_new(0, BLK_PERM_ALL);
blk_insert_bs(blk, bs);
ret = blk_insert_bs(blk, bs, errp);
if (ret < 0) {
blk_unref(blk);
return NULL;
}
job = g_malloc0(driver->instance_size);
error_setg(&job->blocker, "block device is in use by block job: %s",

6
hmp.c
View File

@ -2045,6 +2045,7 @@ void hmp_qemu_io(Monitor *mon, const QDict *qdict)
const char* device = qdict_get_str(qdict, "device");
const char* command = qdict_get_str(qdict, "command");
Error *err = NULL;
int ret;
blk = blk_by_name(device);
if (!blk) {
@ -2052,7 +2053,10 @@ void hmp_qemu_io(Monitor *mon, const QDict *qdict)
if (bs) {
/* FIXME Use real permissions */
blk = local_blk = blk_new(0, BLK_PERM_ALL);
blk_insert_bs(blk, bs);
ret = blk_insert_bs(blk, bs, &err);
if (ret < 0) {
goto fail;
}
} else {
goto fail;
}

7
hw/core/qdev-properties-system.c
View File

@ -73,6 +73,7 @@ static void parse_drive(DeviceState *dev, const char *str, void **ptr,
{
BlockBackend *blk;
bool blk_created = false;
int ret;
blk = blk_by_name(str);
if (!blk) {
@ -80,8 +81,12 @@ static void parse_drive(DeviceState *dev, const char *str, void **ptr,
if (bs) {
/* FIXME Use real permissions */
blk = blk_new(0, BLK_PERM_ALL);
blk_insert_bs(blk, bs);
blk_created = true;
ret = blk_insert_bs(blk, bs, errp);
if (ret < 0) {
goto fail;
}
}
}
if (!blk) {

2
include/sysemu/block-backend.h
View File

@ -102,7 +102,7 @@ BlockBackend *blk_by_public(BlockBackendPublic *public);
BlockDriverState *blk_bs(BlockBackend *blk);
void blk_remove_bs(BlockBackend *blk);
void blk_insert_bs(BlockBackend *blk, BlockDriverState *bs);
int blk_insert_bs(BlockBackend *blk, BlockDriverState *bs, Error **errp);
bool bdrv_has_blk(BlockDriverState *bs);
bool bdrv_is_root_node(BlockDriverState *bs);
int blk_set_perm(BlockBackend *blk, uint64_t perm, uint64_t shared_perm,

2
migration/block.c
View File

@ -446,7 +446,7 @@ static void init_blk_migration(QEMUFile *f)
BlockDriverState *bs = bmds_bs[i].bs;
if (bmds) {
blk_insert_bs(bmds->blk, bs);
blk_insert_bs(bmds->blk, bs, &error_abort);
alloc_aio_bitmap(bmds);
error_setg(&bmds->blocker, "block device is in use by migration");

6
nbd/server.c
View File

@ -891,10 +891,14 @@ NBDExport *nbd_export_new(BlockDriverState *bs, off_t dev_offset, off_t size,
{
BlockBackend *blk;
NBDExport *exp = g_malloc0(sizeof(NBDExport));
int ret;
/* FIXME Use real permissions */
blk = blk_new(0, BLK_PERM_ALL);
blk_insert_bs(blk, bs);
ret = blk_insert_bs(blk, bs, errp);
if (ret < 0) {
goto fail;
}
blk_set_enable_write_cache(blk, !writethrough);
exp->refcount = 1;

2
tests/test-blockjob.c
View File

@ -60,7 +60,7 @@ static BlockBackend *create_blk(const char *name)
bs = bdrv_open("null-co://", NULL, NULL, 0, &error_abort);
g_assert_nonnull(bs);
blk_insert_bs(blk, bs);
blk_insert_bs(blk, bs, &error_abort);
bdrv_unref(bs);
if (name) {