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block/qed: bdrv_qed_do_open: deal with errp

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Always set errp on failure. The generic bdrv_open_driver supports
driver functions which can return a negative value but forget to set
errp.  That's a strange thing. Let's improve bdrv_qed_do_open to not
behave this way. This allows the simplification of code in
bdrv_qed_co_invalidate_cache().

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Greg Kurz <groug@kaod.org>
Message-Id: <20210202124956.63146-14-vsementsov@virtuozzo.com>
[eblake: commit message grammar tweak]
Signed-off-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Vladimir Sementsov-Ogievskiy 2021-02-02 15:49:55 +03:00 committed by Eric Blake
parent e6247c9c9f
commit 15ce94a68c
1 changed files with 15 additions and 9 deletions
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24
block/qed.c
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@ -393,6 +393,7 @@ static int coroutine_fn bdrv_qed_do_open(BlockDriverState *bs, QDict *options,
ret = bdrv_pread(bs->file, 0, &le_header, sizeof(le_header));
if (ret < 0) {
error_setg(errp, "Failed to read QED header");
return ret;
}
qed_header_le_to_cpu(&le_header, &s->header);
@ -408,25 +409,30 @@ static int coroutine_fn bdrv_qed_do_open(BlockDriverState *bs, QDict *options,
return -ENOTSUP;
}
if (!qed_is_cluster_size_valid(s->header.cluster_size)) {
error_setg(errp, "QED cluster size is invalid");
return -EINVAL;
}
/* Round down file size to the last cluster */
file_size = bdrv_getlength(bs->file->bs);
if (file_size < 0) {
error_setg(errp, "Failed to get file length");
return file_size;
}
s->file_size = qed_start_of_cluster(s, file_size);
if (!qed_is_table_size_valid(s->header.table_size)) {
error_setg(errp, "QED table size is invalid");
return -EINVAL;
}
if (!qed_is_image_size_valid(s->header.image_size,
s->header.cluster_size,
s->header.table_size)) {
error_setg(errp, "QED image size is invalid");
return -EINVAL;
}
if (!qed_check_table_offset(s, s->header.l1_table_offset)) {
error_setg(errp, "QED table offset is invalid");
return -EINVAL;
}
@ -438,6 +444,7 @@ static int coroutine_fn bdrv_qed_do_open(BlockDriverState *bs, QDict *options,
/* Header size calculation must not overflow uint32_t */
if (s->header.header_size > UINT32_MAX / s->header.cluster_size) {
error_setg(errp, "QED header size is too large");
return -EINVAL;
}
@ -445,6 +452,7 @@ static int coroutine_fn bdrv_qed_do_open(BlockDriverState *bs, QDict *options,
if ((uint64_t)s->header.backing_filename_offset +
s->header.backing_filename_size >
s->header.cluster_size * s->header.header_size) {
error_setg(errp, "QED backing filename offset is invalid");
return -EINVAL;
}
@ -453,6 +461,7 @@ static int coroutine_fn bdrv_qed_do_open(BlockDriverState *bs, QDict *options,
bs->auto_backing_file,
sizeof(bs->auto_backing_file));
if (ret < 0) {
error_setg(errp, "Failed to read backing filename");
return ret;
}
pstrcpy(bs->backing_file, sizeof(bs->backing_file),
@ -475,6 +484,7 @@ static int coroutine_fn bdrv_qed_do_open(BlockDriverState *bs, QDict *options,
ret = qed_write_header_sync(s);
if (ret) {
error_setg(errp, "Failed to update header");
return ret;
}
@ -487,6 +497,7 @@ static int coroutine_fn bdrv_qed_do_open(BlockDriverState *bs, QDict *options,
ret = qed_read_l1_table_sync(s);
if (ret) {
error_setg(errp, "Failed to read L1 table");
goto out;
}
@ -503,6 +514,7 @@ static int coroutine_fn bdrv_qed_do_open(BlockDriverState *bs, QDict *options,
ret = qed_check(s, &result, true);
if (ret) {
error_setg(errp, "Image corrupted");
goto out;
}
}
@ -1537,22 +1549,16 @@ static void coroutine_fn bdrv_qed_co_invalidate_cache(BlockDriverState *bs,
Error **errp)
{
BDRVQEDState *s = bs->opaque;
Error *local_err = NULL;
int ret;
bdrv_qed_close(bs);
bdrv_qed_init_state(bs);
qemu_co_mutex_lock(&s->table_lock);
ret = bdrv_qed_do_open(bs, NULL, bs->open_flags, &local_err);
ret = bdrv_qed_do_open(bs, NULL, bs->open_flags, errp);
qemu_co_mutex_unlock(&s->table_lock);
if (local_err) {
error_propagate_prepend(errp, local_err,
"Could not reopen qed layer: ");
return;
} else if (ret < 0) {
error_setg_errno(errp, -ret, "Could not reopen qed layer");
return;
if (ret < 0) {
error_prepend(errp, "Could not reopen qed layer: ");
}
}