--- /dev/null
+/*
+ * Block protocol for block driver correctness testing
+ *
+ * Copyright (C) 2010 IBM, Corp.
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#include <stdarg.h>
+#include "qemu/sockets.h" /* for EINPROGRESS on Windows */
+#include "block/block_int.h"
+#include "qapi/qmp/qdict.h"
+#include "qapi/qmp/qstring.h"
+
+typedef struct {
+ BlockDriverState *test_file;
+} BDRVBlkverifyState;
+
+typedef struct BlkverifyAIOCB BlkverifyAIOCB;
+struct BlkverifyAIOCB {
+ BlockAIOCB common;
+ QEMUBH *bh;
+
+ /* Request metadata */
+ bool is_write;
+ int64_t sector_num;
+ int nb_sectors;
+
+ int ret; /* first completed request's result */
+ unsigned int done; /* completion counter */
+
+ QEMUIOVector *qiov; /* user I/O vector */
+ QEMUIOVector raw_qiov; /* cloned I/O vector for raw file */
+ void *buf; /* buffer for raw file I/O */
+
+ void (*verify)(BlkverifyAIOCB *acb);
+};
+
+static const AIOCBInfo blkverify_aiocb_info = {
+ .aiocb_size = sizeof(BlkverifyAIOCB),
+};
+
+static void GCC_FMT_ATTR(2, 3) blkverify_err(BlkverifyAIOCB *acb,
+ const char *fmt, ...)
+{
+ va_list ap;
+
+ va_start(ap, fmt);
+ fprintf(stderr, "blkverify: %s sector_num=%" PRId64 " nb_sectors=%d ",
+ acb->is_write ? "write" : "read", acb->sector_num,
+ acb->nb_sectors);
+ vfprintf(stderr, fmt, ap);
+ fprintf(stderr, "\n");
+ va_end(ap);
+ exit(1);
+}
+
+/* Valid blkverify filenames look like blkverify:path/to/raw_image:path/to/image */
+static void blkverify_parse_filename(const char *filename, QDict *options,
+ Error **errp)
+{
+ const char *c;
+ QString *raw_path;
+
+
+ /* Parse the blkverify: prefix */
+ if (!strstart(filename, "blkverify:", &filename)) {
+ /* There was no prefix; therefore, all options have to be already
+ present in the QDict (except for the filename) */
+ qdict_put(options, "x-image", qstring_from_str(filename));
+ return;
+ }
+
+ /* Parse the raw image filename */
+ c = strchr(filename, ':');
+ if (c == NULL) {
+ error_setg(errp, "blkverify requires raw copy and original image path");
+ return;
+ }
+
+ /* TODO Implement option pass-through and set raw.filename here */
+ raw_path = qstring_from_substr(filename, 0, c - filename - 1);
+ qdict_put(options, "x-raw", raw_path);
+
+ /* TODO Allow multi-level nesting and set file.filename here */
+ filename = c + 1;
+ qdict_put(options, "x-image", qstring_from_str(filename));
+}
+
+static QemuOptsList runtime_opts = {
+ .name = "blkverify",
+ .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
+ .desc = {
+ {
+ .name = "x-raw",
+ .type = QEMU_OPT_STRING,
+ .help = "[internal use only, will be removed]",
+ },
+ {
+ .name = "x-image",
+ .type = QEMU_OPT_STRING,
+ .help = "[internal use only, will be removed]",
+ },
+ { /* end of list */ }
+ },
+};
+
+static int blkverify_open(BlockDriverState *bs, QDict *options, int flags,
+ Error **errp)
+{
+ BDRVBlkverifyState *s = bs->opaque;
+ QemuOpts *opts;
+ Error *local_err = NULL;
+ int ret;
+
+ opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
+ qemu_opts_absorb_qdict(opts, options, &local_err);
+ if (local_err) {
+ error_propagate(errp, local_err);
+ ret = -EINVAL;
+ goto fail;
+ }
+
+ /* Open the raw file */
+ assert(bs->file == NULL);
+ ret = bdrv_open_image(&bs->file, qemu_opt_get(opts, "x-raw"), options,
+ "raw", bs, &child_file, false, &local_err);
+ if (ret < 0) {
+ error_propagate(errp, local_err);
+ goto fail;
+ }
+
+ /* Open the test file */
+ assert(s->test_file == NULL);
+ ret = bdrv_open_image(&s->test_file, qemu_opt_get(opts, "x-image"), options,
+ "test", bs, &child_format, false, &local_err);
+ if (ret < 0) {
+ error_propagate(errp, local_err);
+ s->test_file = NULL;
+ goto fail;
+ }
+
+ ret = 0;
+fail:
+ qemu_opts_del(opts);
+ return ret;
+}
+
+static void blkverify_close(BlockDriverState *bs)
+{
+ BDRVBlkverifyState *s = bs->opaque;
+
+ bdrv_unref(s->test_file);
+ s->test_file = NULL;
+}
+
+static int64_t blkverify_getlength(BlockDriverState *bs)
+{
+ BDRVBlkverifyState *s = bs->opaque;
+
+ return bdrv_getlength(s->test_file);
+}
+
+static BlkverifyAIOCB *blkverify_aio_get(BlockDriverState *bs, bool is_write,
+ int64_t sector_num, QEMUIOVector *qiov,
+ int nb_sectors,
+ BlockCompletionFunc *cb,
+ void *opaque)
+{
+ BlkverifyAIOCB *acb = qemu_aio_get(&blkverify_aiocb_info, bs, cb, opaque);
+
+ acb->bh = NULL;
+ acb->is_write = is_write;
+ acb->sector_num = sector_num;
+ acb->nb_sectors = nb_sectors;
+ acb->ret = -EINPROGRESS;
+ acb->done = 0;
+ acb->qiov = qiov;
+ acb->buf = NULL;
+ acb->verify = NULL;
+ return acb;
+}
+
+static void blkverify_aio_bh(void *opaque)
+{
+ BlkverifyAIOCB *acb = opaque;
+
+ qemu_bh_delete(acb->bh);
+ if (acb->buf) {
+ qemu_iovec_destroy(&acb->raw_qiov);
+ qemu_vfree(acb->buf);
+ }
+ acb->common.cb(acb->common.opaque, acb->ret);
+ qemu_aio_unref(acb);
+}
+
+static void blkverify_aio_cb(void *opaque, int ret)
+{
+ BlkverifyAIOCB *acb = opaque;
+
+ switch (++acb->done) {
+ case 1:
+ acb->ret = ret;
+ break;
+
+ case 2:
+ if (acb->ret != ret) {
+ blkverify_err(acb, "return value mismatch %d != %d", acb->ret, ret);
+ }
+
+ if (acb->verify) {
+ acb->verify(acb);
+ }
+
+ acb->bh = aio_bh_new(bdrv_get_aio_context(acb->common.bs),
+ blkverify_aio_bh, acb);
+ qemu_bh_schedule(acb->bh);
+ break;
+ }
+}
+
+static void blkverify_verify_readv(BlkverifyAIOCB *acb)
+{
+ ssize_t offset = qemu_iovec_compare(acb->qiov, &acb->raw_qiov);
+ if (offset != -1) {
+ blkverify_err(acb, "contents mismatch in sector %" PRId64,
+ acb->sector_num + (int64_t)(offset / BDRV_SECTOR_SIZE));
+ }
+}
+
+static BlockAIOCB *blkverify_aio_readv(BlockDriverState *bs,
+ int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
+ BlockCompletionFunc *cb, void *opaque)
+{
+ BDRVBlkverifyState *s = bs->opaque;
+ BlkverifyAIOCB *acb = blkverify_aio_get(bs, false, sector_num, qiov,
+ nb_sectors, cb, opaque);
+
+ acb->verify = blkverify_verify_readv;
+ acb->buf = qemu_blockalign(bs->file, qiov->size);
+ qemu_iovec_init(&acb->raw_qiov, acb->qiov->niov);
+ qemu_iovec_clone(&acb->raw_qiov, qiov, acb->buf);
+
+ bdrv_aio_readv(s->test_file, sector_num, qiov, nb_sectors,
+ blkverify_aio_cb, acb);
+ bdrv_aio_readv(bs->file, sector_num, &acb->raw_qiov, nb_sectors,
+ blkverify_aio_cb, acb);
+ return &acb->common;
+}
+
+static BlockAIOCB *blkverify_aio_writev(BlockDriverState *bs,
+ int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
+ BlockCompletionFunc *cb, void *opaque)
+{
+ BDRVBlkverifyState *s = bs->opaque;
+ BlkverifyAIOCB *acb = blkverify_aio_get(bs, true, sector_num, qiov,
+ nb_sectors, cb, opaque);
+
+ bdrv_aio_writev(s->test_file, sector_num, qiov, nb_sectors,
+ blkverify_aio_cb, acb);
+ bdrv_aio_writev(bs->file, sector_num, qiov, nb_sectors,
+ blkverify_aio_cb, acb);
+ return &acb->common;
+}
+
+static BlockAIOCB *blkverify_aio_flush(BlockDriverState *bs,
+ BlockCompletionFunc *cb,
+ void *opaque)
+{
+ BDRVBlkverifyState *s = bs->opaque;
+
+ /* Only flush test file, the raw file is not important */
+ return bdrv_aio_flush(s->test_file, cb, opaque);
+}
+
+static bool blkverify_recurse_is_first_non_filter(BlockDriverState *bs,
+ BlockDriverState *candidate)
+{
+ BDRVBlkverifyState *s = bs->opaque;
+
+ bool perm = bdrv_recurse_is_first_non_filter(bs->file, candidate);
+
+ if (perm) {
+ return true;
+ }
+
+ return bdrv_recurse_is_first_non_filter(s->test_file, candidate);
+}
+
+/* Propagate AioContext changes to ->test_file */
+static void blkverify_detach_aio_context(BlockDriverState *bs)
+{
+ BDRVBlkverifyState *s = bs->opaque;
+
+ bdrv_detach_aio_context(s->test_file);
+}
+
+static void blkverify_attach_aio_context(BlockDriverState *bs,
+ AioContext *new_context)
+{
+ BDRVBlkverifyState *s = bs->opaque;
+
+ bdrv_attach_aio_context(s->test_file, new_context);
+}
+
+static void blkverify_refresh_filename(BlockDriverState *bs)
+{
+ BDRVBlkverifyState *s = bs->opaque;
+
+ /* bs->file has already been refreshed */
+ bdrv_refresh_filename(s->test_file);
+
+ if (bs->file->full_open_options && s->test_file->full_open_options) {
+ QDict *opts = qdict_new();
+ qdict_put_obj(opts, "driver", QOBJECT(qstring_from_str("blkverify")));
+
+ QINCREF(bs->file->full_open_options);
+ qdict_put_obj(opts, "raw", QOBJECT(bs->file->full_open_options));
+ QINCREF(s->test_file->full_open_options);
+ qdict_put_obj(opts, "test", QOBJECT(s->test_file->full_open_options));
+
+ bs->full_open_options = opts;
+ }
+
+ if (bs->file->exact_filename[0] && s->test_file->exact_filename[0]) {
+ snprintf(bs->exact_filename, sizeof(bs->exact_filename),
+ "blkverify:%s:%s",
+ bs->file->exact_filename, s->test_file->exact_filename);
+ }
+}
+
+static BlockDriver bdrv_blkverify = {
+ .format_name = "blkverify",
+ .protocol_name = "blkverify",
+ .instance_size = sizeof(BDRVBlkverifyState),
+
+ .bdrv_parse_filename = blkverify_parse_filename,
+ .bdrv_file_open = blkverify_open,
+ .bdrv_close = blkverify_close,
+ .bdrv_getlength = blkverify_getlength,
+ .bdrv_refresh_filename = blkverify_refresh_filename,
+
+ .bdrv_aio_readv = blkverify_aio_readv,
+ .bdrv_aio_writev = blkverify_aio_writev,
+ .bdrv_aio_flush = blkverify_aio_flush,
+
+ .bdrv_attach_aio_context = blkverify_attach_aio_context,
+ .bdrv_detach_aio_context = blkverify_detach_aio_context,
+
+ .is_filter = true,
+ .bdrv_recurse_is_first_non_filter = blkverify_recurse_is_first_non_filter,
+};
+
+static void bdrv_blkverify_init(void)
+{
+ bdrv_register(&bdrv_blkverify);
+}
+
+block_init(bdrv_blkverify_init);
Code Review / kvmfornfv.git / blobdiff