bdrv_default_perms() can decide which permission profile to use based on the BdrvChildRole, so block drivers do not need to select it explicitly. The blkverify driver now no longer shares the WRITE permission for the image to verify. We thus have to adjust two places in test-block-iothread not to take it. (Note that in theory, blkverify should behave like quorum in this regard and share neither WRITE nor RESIZE for both of its children. In practice, it does not really matter, because blkverify is used only for debugging, so we might as well keep its permissions rather liberal.) Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-Id: <20200513110544.176672-30-mreitz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
341 lines
10 KiB
C
341 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_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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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 (*request_fn)(BdrvChild *, int64_t, unsigned int, QEMUIOVector *,
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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 GCC_FMT_ATTR(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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Error *local_err = NULL;
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int ret;
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opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
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qemu_opts_absorb_qdict(opts, options, &local_err);
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if (local_err) {
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error_propagate(errp, local_err);
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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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bs->file = bdrv_open_child(qemu_opt_get(opts, "x-raw"), options, "raw",
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bs, &child_of_bds,
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BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY,
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false, &local_err);
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if (local_err) {
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ret = -EINVAL;
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error_propagate(errp, local_err);
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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, &local_err);
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if (local_err) {
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ret = -EINVAL;
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error_propagate(errp, local_err);
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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_unref_child(bs, s->test_file);
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s->test_file = NULL;
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}
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static int64_t blkverify_getlength(BlockDriverState *bs)
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{
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BDRVBlkverifyState *s = bs->opaque;
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return bdrv_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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r->ret = r->request_fn(s->test_file, r->offset, r->bytes, r->qiov,
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r->flags);
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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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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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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
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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
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blkverify_co_preadv(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
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QEMUIOVector *qiov, int 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, flags,
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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
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blkverify_co_pwritev(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
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QEMUIOVector *qiov, int 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 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 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 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_getlength = blkverify_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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