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migration: Always report an error in block_save_setup()

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This will prepare ground for future changes adding an Error** argument
to the save_setup() handler. We need to make sure that on failure,
block_save_setup() always sets a new error.

Cc: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Fabiano Rosas <farosas@suse.de>
Signed-off-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/r/20240320064911.545001-4-clg@redhat.com
Signed-off-by: Peter Xu <peterx@redhat.com>
This commit is contained in:
Cédric Le Goater 2024-03-20 07:48:59 +01:00 committed by Peter Xu
parent 31cf7c1413
commit 150da48cb2
1 changed files with 15 additions and 5 deletions
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20
migration/block.c
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@ -367,7 +367,7 @@ static void unset_dirty_tracking(void)
}
}
static int init_blk_migration(QEMUFile *f)
static int init_blk_migration(QEMUFile *f, Error **errp)
{
BlockDriverState *bs;
BlkMigDevState *bmds;
@ -378,7 +378,6 @@ static int init_blk_migration(QEMUFile *f)
BlkMigDevState *bmds;
BlockDriverState *bs;
} *bmds_bs;
Error *local_err = NULL;
int ret;
GRAPH_RDLOCK_GUARD_MAINLOOP();
@ -406,6 +405,8 @@ static int init_blk_migration(QEMUFile *f)
continue;
}
if (sectors < 0) {
error_setg(errp, "Error getting length of block device %s",
bdrv_get_device_name(bs));
ret = sectors;
bdrv_next_cleanup(&it);
goto out;
@ -442,9 +443,8 @@ static int init_blk_migration(QEMUFile *f)
bs = bmds_bs[i].bs;
if (bmds) {
ret = blk_insert_bs(bmds->blk, bs, &local_err);
ret = blk_insert_bs(bmds->blk, bs, errp);
if (ret < 0) {
error_report_err(local_err);
goto out;
}
@ -714,6 +714,7 @@ static void block_migration_cleanup(void *opaque)
static int block_save_setup(QEMUFile *f, void *opaque)
{
int ret;
Error *local_err = NULL;
trace_migration_block_save("setup", block_mig_state.submitted,
block_mig_state.transferred);
@ -721,18 +722,27 @@ static int block_save_setup(QEMUFile *f, void *opaque)
warn_report("block migration is deprecated;"
" use blockdev-mirror with NBD instead");
ret = init_blk_migration(f);
ret = init_blk_migration(f, &local_err);
if (ret < 0) {
error_report_err(local_err);
return ret;
}
/* start track dirty blocks */
ret = set_dirty_tracking();
if (ret) {
error_setg_errno(&local_err, -ret,
"Failed to start block dirty tracking");
error_report_err(local_err);
return ret;
}
ret = flush_blks(f);
if (ret) {
error_setg_errno(&local_err, -ret, "Flushing block failed");
error_report_err(local_err);
return ret;
}
blk_mig_reset_dirty_cursor();
qemu_put_be64(f, BLK_MIG_FLAG_EOS);