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![Stefan Hajnoczi](/assets/img/avatar_default.png)
Stop acquiring/releasing the AioContext lock in bdrv_graph_wrlock()/bdrv_graph_unlock() since the lock no longer has any effect. The distinction between bdrv_graph_wrunlock() and bdrv_graph_wrunlock_ctx() becomes meaningless and they can be collapsed into one function. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Message-ID: <20231205182011.1976568-6-stefanha@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
345 lines
10 KiB
C
345 lines
10 KiB
C
/*
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* Block protocol for block driver correctness testing
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*
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* Copyright (C) 2010 IBM, Corp.
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#include "qemu/osdep.h"
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#include "qapi/error.h"
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#include "qemu/sockets.h" /* for EINPROGRESS on Windows */
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#include "block/block-io.h"
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#include "block/block_int.h"
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#include "qapi/qmp/qdict.h"
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#include "qapi/qmp/qstring.h"
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#include "qemu/cutils.h"
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#include "qemu/module.h"
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#include "qemu/option.h"
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#include "qemu/memalign.h"
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typedef struct {
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BdrvChild *test_file;
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} BDRVBlkverifyState;
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typedef struct BlkverifyRequest {
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Coroutine *co;
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BlockDriverState *bs;
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/* Request metadata */
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bool is_write;
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uint64_t offset;
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uint64_t bytes;
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int flags;
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int GRAPH_RDLOCK_PTR (*request_fn)(
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BdrvChild *, int64_t, int64_t, QEMUIOVector *, BdrvRequestFlags);
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int ret; /* test image result */
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int raw_ret; /* raw image result */
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unsigned int done; /* completion counter */
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QEMUIOVector *qiov; /* user I/O vector */
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QEMUIOVector *raw_qiov; /* cloned I/O vector for raw file */
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} BlkverifyRequest;
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static void G_GNUC_PRINTF(2, 3) blkverify_err(BlkverifyRequest *r,
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const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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fprintf(stderr, "blkverify: %s offset=%" PRId64 " bytes=%" PRId64 " ",
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r->is_write ? "write" : "read", r->offset, r->bytes);
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vfprintf(stderr, fmt, ap);
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fprintf(stderr, "\n");
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va_end(ap);
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exit(1);
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}
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/* Valid blkverify filenames look like blkverify:path/to/raw_image:path/to/image */
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static void blkverify_parse_filename(const char *filename, QDict *options,
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Error **errp)
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{
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const char *c;
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QString *raw_path;
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/* Parse the blkverify: prefix */
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if (!strstart(filename, "blkverify:", &filename)) {
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/* There was no prefix; therefore, all options have to be already
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present in the QDict (except for the filename) */
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qdict_put_str(options, "x-image", filename);
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return;
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}
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/* Parse the raw image filename */
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c = strchr(filename, ':');
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if (c == NULL) {
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error_setg(errp, "blkverify requires raw copy and original image path");
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return;
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}
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/* TODO Implement option pass-through and set raw.filename here */
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raw_path = qstring_from_substr(filename, 0, c - filename);
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qdict_put(options, "x-raw", raw_path);
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/* TODO Allow multi-level nesting and set file.filename here */
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filename = c + 1;
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qdict_put_str(options, "x-image", filename);
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}
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static QemuOptsList runtime_opts = {
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.name = "blkverify",
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.head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
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.desc = {
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{
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.name = "x-raw",
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.type = QEMU_OPT_STRING,
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.help = "[internal use only, will be removed]",
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},
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{
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.name = "x-image",
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.type = QEMU_OPT_STRING,
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.help = "[internal use only, will be removed]",
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},
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{ /* end of list */ }
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},
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};
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static int blkverify_open(BlockDriverState *bs, QDict *options, int flags,
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Error **errp)
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{
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BDRVBlkverifyState *s = bs->opaque;
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QemuOpts *opts;
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int ret;
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opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
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if (!qemu_opts_absorb_qdict(opts, options, errp)) {
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ret = -EINVAL;
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goto fail;
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}
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/* Open the raw file */
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ret = bdrv_open_file_child(qemu_opt_get(opts, "x-raw"), options, "raw",
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bs, errp);
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if (ret < 0) {
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goto fail;
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}
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/* Open the test file */
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s->test_file = bdrv_open_child(qemu_opt_get(opts, "x-image"), options,
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"test", bs, &child_of_bds, BDRV_CHILD_DATA,
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false, errp);
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if (!s->test_file) {
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ret = -EINVAL;
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goto fail;
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}
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bs->supported_write_flags = BDRV_REQ_WRITE_UNCHANGED;
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bs->supported_zero_flags = BDRV_REQ_WRITE_UNCHANGED;
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ret = 0;
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fail:
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qemu_opts_del(opts);
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return ret;
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}
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static void blkverify_close(BlockDriverState *bs)
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{
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BDRVBlkverifyState *s = bs->opaque;
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bdrv_graph_wrlock();
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bdrv_unref_child(bs, s->test_file);
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s->test_file = NULL;
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bdrv_graph_wrunlock();
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}
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static int64_t coroutine_fn GRAPH_RDLOCK
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blkverify_co_getlength(BlockDriverState *bs)
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{
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BDRVBlkverifyState *s = bs->opaque;
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return bdrv_co_getlength(s->test_file->bs);
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}
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static void coroutine_fn blkverify_do_test_req(void *opaque)
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{
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BlkverifyRequest *r = opaque;
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BDRVBlkverifyState *s = r->bs->opaque;
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bdrv_graph_co_rdlock();
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r->ret = r->request_fn(s->test_file, r->offset, r->bytes, r->qiov,
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r->flags);
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bdrv_graph_co_rdunlock();
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r->done++;
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qemu_coroutine_enter_if_inactive(r->co);
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}
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static void coroutine_fn blkverify_do_raw_req(void *opaque)
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{
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BlkverifyRequest *r = opaque;
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bdrv_graph_co_rdlock();
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r->raw_ret = r->request_fn(r->bs->file, r->offset, r->bytes, r->raw_qiov,
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r->flags);
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bdrv_graph_co_rdunlock();
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r->done++;
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qemu_coroutine_enter_if_inactive(r->co);
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}
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static int coroutine_fn GRAPH_RDLOCK
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blkverify_co_prwv(BlockDriverState *bs, BlkverifyRequest *r, uint64_t offset,
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uint64_t bytes, QEMUIOVector *qiov, QEMUIOVector *raw_qiov,
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int flags, bool is_write)
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{
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Coroutine *co_a, *co_b;
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*r = (BlkverifyRequest) {
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.co = qemu_coroutine_self(),
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.bs = bs,
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.offset = offset,
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.bytes = bytes,
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.qiov = qiov,
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.raw_qiov = raw_qiov,
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.flags = flags,
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.is_write = is_write,
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.request_fn = is_write ? bdrv_co_pwritev : bdrv_co_preadv,
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};
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co_a = qemu_coroutine_create(blkverify_do_test_req, r);
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co_b = qemu_coroutine_create(blkverify_do_raw_req, r);
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qemu_coroutine_enter(co_a);
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qemu_coroutine_enter(co_b);
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while (r->done < 2) {
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qemu_coroutine_yield();
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}
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if (r->ret != r->raw_ret) {
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blkverify_err(r, "return value mismatch %d != %d", r->ret, r->raw_ret);
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}
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return r->ret;
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}
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static int coroutine_fn GRAPH_RDLOCK
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blkverify_co_preadv(BlockDriverState *bs, int64_t offset, int64_t bytes,
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QEMUIOVector *qiov, BdrvRequestFlags flags)
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{
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BlkverifyRequest r;
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QEMUIOVector raw_qiov;
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void *buf;
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ssize_t cmp_offset;
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int ret;
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buf = qemu_blockalign(bs->file->bs, qiov->size);
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qemu_iovec_init(&raw_qiov, qiov->niov);
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qemu_iovec_clone(&raw_qiov, qiov, buf);
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ret = blkverify_co_prwv(bs, &r, offset, bytes, qiov, &raw_qiov,
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flags & ~BDRV_REQ_REGISTERED_BUF, false);
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cmp_offset = qemu_iovec_compare(qiov, &raw_qiov);
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if (cmp_offset != -1) {
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blkverify_err(&r, "contents mismatch at offset %" PRId64,
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offset + cmp_offset);
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}
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qemu_iovec_destroy(&raw_qiov);
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qemu_vfree(buf);
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return ret;
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}
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static int coroutine_fn GRAPH_RDLOCK
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blkverify_co_pwritev(BlockDriverState *bs, int64_t offset, int64_t bytes,
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QEMUIOVector *qiov, BdrvRequestFlags flags)
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{
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BlkverifyRequest r;
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return blkverify_co_prwv(bs, &r, offset, bytes, qiov, qiov, flags, true);
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}
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static int coroutine_fn GRAPH_RDLOCK blkverify_co_flush(BlockDriverState *bs)
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{
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BDRVBlkverifyState *s = bs->opaque;
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/* Only flush test file, the raw file is not important */
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return bdrv_co_flush(s->test_file->bs);
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}
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static bool GRAPH_RDLOCK
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blkverify_recurse_can_replace(BlockDriverState *bs,
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BlockDriverState *to_replace)
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{
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BDRVBlkverifyState *s = bs->opaque;
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/*
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* blkverify quits the whole qemu process if there is a mismatch
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* between bs->file->bs and s->test_file->bs. Therefore, we know
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* know that both must match bs and we can recurse down to either.
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*/
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return bdrv_recurse_can_replace(bs->file->bs, to_replace) ||
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bdrv_recurse_can_replace(s->test_file->bs, to_replace);
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}
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static void GRAPH_RDLOCK blkverify_refresh_filename(BlockDriverState *bs)
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{
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BDRVBlkverifyState *s = bs->opaque;
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if (bs->file->bs->exact_filename[0]
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&& s->test_file->bs->exact_filename[0])
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{
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int ret = snprintf(bs->exact_filename, sizeof(bs->exact_filename),
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"blkverify:%s:%s",
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bs->file->bs->exact_filename,
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s->test_file->bs->exact_filename);
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if (ret >= sizeof(bs->exact_filename)) {
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/* An overflow makes the filename unusable, so do not report any */
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bs->exact_filename[0] = 0;
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}
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}
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}
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static char *blkverify_dirname(BlockDriverState *bs, Error **errp)
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{
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/* In general, there are two BDSs with different dirnames below this one;
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* so there is no unique dirname we could return (unless both are equal by
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* chance). Therefore, to be consistent, just always return NULL. */
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error_setg(errp, "Cannot generate a base directory for blkverify nodes");
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return NULL;
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}
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static BlockDriver bdrv_blkverify = {
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.format_name = "blkverify",
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.protocol_name = "blkverify",
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.instance_size = sizeof(BDRVBlkverifyState),
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.bdrv_parse_filename = blkverify_parse_filename,
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.bdrv_file_open = blkverify_open,
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.bdrv_close = blkverify_close,
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.bdrv_child_perm = bdrv_default_perms,
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.bdrv_co_getlength = blkverify_co_getlength,
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.bdrv_refresh_filename = blkverify_refresh_filename,
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.bdrv_dirname = blkverify_dirname,
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.bdrv_co_preadv = blkverify_co_preadv,
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.bdrv_co_pwritev = blkverify_co_pwritev,
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.bdrv_co_flush = blkverify_co_flush,
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.is_filter = true,
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.bdrv_recurse_can_replace = blkverify_recurse_can_replace,
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};
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static void bdrv_blkverify_init(void)
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{
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bdrv_register(&bdrv_blkverify);
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}
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block_init(bdrv_blkverify_init);
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