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qcow2: mark various functions as coroutine_fn and GRAPH_RDLOCK

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Functions that can do I/O (including calling bdrv_is_allocated
and bdrv_block_status functions) are prime candidates for being
coroutine_fns.  Make the change for those that are themselves called
only from coroutine_fns.  Also annotate that they are called with the
graph rdlock taken, thus allowing them to call bdrv_co_*() functions
for I/O.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20230309084456.304669-9-pbonzini@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Paolo Bonzini 2023-03-09 09:44:55 +01:00 • committed by Kevin Wolf
parent 10bf10a8e3
commit a39bae4ecd
6 changed files with 53 additions and 45 deletions
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27
block/qcow2.c
View file

@ -199,10 +199,10 @@ qcow2_extract_crypto_opts(QemuOpts *opts, const char *fmt, Error **errp)
* unknown magic is skipped (future extension this version knows nothing about)
* return 0 upon success, non-0 otherwise
*/
static int qcow2_read_extensions(BlockDriverState *bs, uint64_t start_offset,
uint64_t end_offset, void **p_feature_table,
int flags, bool *need_update_header,
Error **errp)
static int coroutine_fn GRAPH_RDLOCK
qcow2_read_extensions(BlockDriverState *bs, uint64_t start_offset,
uint64_t end_offset, void **p_feature_table,
int flags, bool *need_update_header, Error **errp)
{
BDRVQcow2State *s = bs->opaque;
QCowExtension ext;
@ -228,7 +228,7 @@ static int qcow2_read_extensions(BlockDriverState *bs, uint64_t start_offset,
printf("attempting to read extended header in offset %lu\n", offset);
#endif
ret = bdrv_pread(bs->file, offset, sizeof(ext), &ext, 0);
ret = bdrv_co_pread(bs->file, offset, sizeof(ext), &ext, 0);
if (ret < 0) {
error_setg_errno(errp, -ret, "qcow2_read_extension: ERROR: "
"pread fail from offset %" PRIu64, offset);
@ -256,7 +256,7 @@ static int qcow2_read_extensions(BlockDriverState *bs, uint64_t start_offset,
sizeof(bs->backing_format));
return 2;
}
ret = bdrv_pread(bs->file, offset, ext.len, bs->backing_format, 0);
ret = bdrv_co_pread(bs->file, offset, ext.len, bs->backing_format, 0);
if (ret < 0) {
error_setg_errno(errp, -ret, "ERROR: ext_backing_format: "
"Could not read format name");
@ -272,7 +272,7 @@ static int qcow2_read_extensions(BlockDriverState *bs, uint64_t start_offset,
case QCOW2_EXT_MAGIC_FEATURE_TABLE:
if (p_feature_table != NULL) {
void *feature_table = g_malloc0(ext.len + 2 * sizeof(Qcow2Feature));
ret = bdrv_pread(bs->file, offset, ext.len, feature_table, 0);
ret = bdrv_co_pread(bs->file, offset, ext.len, feature_table, 0);
if (ret < 0) {
error_setg_errno(errp, -ret, "ERROR: ext_feature_table: "
"Could not read table");
@ -298,7 +298,7 @@ static int qcow2_read_extensions(BlockDriverState *bs, uint64_t start_offset,
return -EINVAL;
}
ret = bdrv_pread(bs->file, offset, ext.len, &s->crypto_header, 0);
ret = bdrv_co_pread(bs->file, offset, ext.len, &s->crypto_header, 0);
if (ret < 0) {
error_setg_errno(errp, -ret,
"Unable to read CRYPTO header extension");
@ -354,7 +354,7 @@ static int qcow2_read_extensions(BlockDriverState *bs, uint64_t start_offset,
break;
}
ret = bdrv_pread(bs->file, offset, ext.len, &bitmaps_ext, 0);
ret = bdrv_co_pread(bs->file, offset, ext.len, &bitmaps_ext, 0);
if (ret < 0) {
error_setg_errno(errp, -ret, "bitmaps_ext: "
"Could not read ext header");
@ -418,7 +418,7 @@ static int qcow2_read_extensions(BlockDriverState *bs, uint64_t start_offset,
case QCOW2_EXT_MAGIC_DATA_FILE:
{
s->image_data_file = g_malloc0(ext.len + 1);
ret = bdrv_pread(bs->file, offset, ext.len, s->image_data_file, 0);
ret = bdrv_co_pread(bs->file, offset, ext.len, s->image_data_file, 0);
if (ret < 0) {
error_setg_errno(errp, -ret,
"ERROR: Could not read data file name");
@ -442,7 +442,7 @@ static int qcow2_read_extensions(BlockDriverState *bs, uint64_t start_offset,
uext->len = ext.len;
QLIST_INSERT_HEAD(&s->unknown_header_ext, uext, next);
ret = bdrv_pread(bs->file, offset, uext->len, uext->data, 0);
ret = bdrv_co_pread(bs->file, offset, uext->len, uext->data, 0);
if (ret < 0) {
error_setg_errno(errp, -ret, "ERROR: unknown extension: "
"Could not read data");
@ -1241,8 +1241,9 @@ static void qcow2_update_options_abort(BlockDriverState *bs,
qapi_free_QCryptoBlockOpenOptions(r->crypto_opts);
}
static int qcow2_update_options(BlockDriverState *bs, QDict *options,
int flags, Error **errp)
static int coroutine_fn
qcow2_update_options(BlockDriverState *bs, QDict *options, int flags,
Error **errp)
{
Qcow2ReopenState r = {};
int ret;