/*
* Block protocol for I/O error injection
*
+ * Copyright (C) 2016-2017 Red Hat, Inc.
* Copyright (c) 2010 Kevin Wolf <kwolf@redhat.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
typedef struct BDRVBlkdebugState {
int state;
int new_state;
- int align;
+ uint64_t align;
+ uint64_t max_transfer;
+ uint64_t opt_write_zero;
+ uint64_t max_write_zero;
+ uint64_t opt_discard;
+ uint64_t max_discard;
/* For blkdebug_refresh_filename() */
char *config_file;
if (!strstart(filename, "blkdebug:", &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));
+ qdict_put_str(options, "x-image", filename);
return;
}
/* TODO Allow multi-level nesting and set file.filename here */
filename = c + 1;
- qdict_put(options, "x-image", qstring_from_str(filename));
+ qdict_put_str(options, "x-image", filename);
}
static QemuOptsList runtime_opts = {
.type = QEMU_OPT_SIZE,
.help = "Required alignment in bytes",
},
+ {
+ .name = "max-transfer",
+ .type = QEMU_OPT_SIZE,
+ .help = "Maximum transfer size in bytes",
+ },
+ {
+ .name = "opt-write-zero",
+ .type = QEMU_OPT_SIZE,
+ .help = "Optimum write zero alignment in bytes",
+ },
+ {
+ .name = "max-write-zero",
+ .type = QEMU_OPT_SIZE,
+ .help = "Maximum write zero size in bytes",
+ },
+ {
+ .name = "opt-discard",
+ .type = QEMU_OPT_SIZE,
+ .help = "Optimum discard alignment in bytes",
+ },
+ {
+ .name = "max-discard",
+ .type = QEMU_OPT_SIZE,
+ .help = "Maximum discard size in bytes",
+ },
{ /* end of list */ }
},
};
BDRVBlkdebugState *s = bs->opaque;
QemuOpts *opts;
Error *local_err = NULL;
- uint64_t align;
int ret;
+ uint64_t align;
opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
qemu_opts_absorb_qdict(opts, options, &local_err);
goto out;
}
- /* Set request alignment */
- align = qemu_opt_get_size(opts, "align", 0);
- if (align < INT_MAX && is_power_of_2(align)) {
- s->align = align;
- } else if (align) {
- error_setg(errp, "Invalid alignment");
- ret = -EINVAL;
- goto fail_unref;
+ bs->supported_write_flags = BDRV_REQ_FUA &
+ bs->file->bs->supported_write_flags;
+ bs->supported_zero_flags = (BDRV_REQ_FUA | BDRV_REQ_MAY_UNMAP) &
+ bs->file->bs->supported_zero_flags;
+ ret = -EINVAL;
+
+ /* Set alignment overrides */
+ s->align = qemu_opt_get_size(opts, "align", 0);
+ if (s->align && (s->align >= INT_MAX || !is_power_of_2(s->align))) {
+ error_setg(errp, "Cannot meet constraints with align %" PRIu64,
+ s->align);
+ goto out;
}
+ align = MAX(s->align, bs->file->bs->bl.request_alignment);
- ret = 0;
- goto out;
+ s->max_transfer = qemu_opt_get_size(opts, "max-transfer", 0);
+ if (s->max_transfer &&
+ (s->max_transfer >= INT_MAX ||
+ !QEMU_IS_ALIGNED(s->max_transfer, align))) {
+ error_setg(errp, "Cannot meet constraints with max-transfer %" PRIu64,
+ s->max_transfer);
+ goto out;
+ }
-fail_unref:
- bdrv_unref_child(bs, bs->file);
+ s->opt_write_zero = qemu_opt_get_size(opts, "opt-write-zero", 0);
+ if (s->opt_write_zero &&
+ (s->opt_write_zero >= INT_MAX ||
+ !QEMU_IS_ALIGNED(s->opt_write_zero, align))) {
+ error_setg(errp, "Cannot meet constraints with opt-write-zero %" PRIu64,
+ s->opt_write_zero);
+ goto out;
+ }
+
+ s->max_write_zero = qemu_opt_get_size(opts, "max-write-zero", 0);
+ if (s->max_write_zero &&
+ (s->max_write_zero >= INT_MAX ||
+ !QEMU_IS_ALIGNED(s->max_write_zero,
+ MAX(s->opt_write_zero, align)))) {
+ error_setg(errp, "Cannot meet constraints with max-write-zero %" PRIu64,
+ s->max_write_zero);
+ goto out;
+ }
+
+ s->opt_discard = qemu_opt_get_size(opts, "opt-discard", 0);
+ if (s->opt_discard &&
+ (s->opt_discard >= INT_MAX ||
+ !QEMU_IS_ALIGNED(s->opt_discard, align))) {
+ error_setg(errp, "Cannot meet constraints with opt-discard %" PRIu64,
+ s->opt_discard);
+ goto out;
+ }
+
+ s->max_discard = qemu_opt_get_size(opts, "max-discard", 0);
+ if (s->max_discard &&
+ (s->max_discard >= INT_MAX ||
+ !QEMU_IS_ALIGNED(s->max_discard,
+ MAX(s->opt_discard, align)))) {
+ error_setg(errp, "Cannot meet constraints with max-discard %" PRIu64,
+ s->max_discard);
+ goto out;
+ }
+
+ ret = 0;
out:
if (ret < 0) {
g_free(s->config_file);
return ret;
}
-static int inject_error(BlockDriverState *bs, BlkdebugRule *rule)
+static int rule_check(BlockDriverState *bs, uint64_t offset, uint64_t bytes)
{
BDRVBlkdebugState *s = bs->opaque;
- int error = rule->options.inject.error;
- bool immediately = rule->options.inject.immediately;
+ BlkdebugRule *rule = NULL;
+ int error;
+ bool immediately;
+
+ QSIMPLEQ_FOREACH(rule, &s->active_rules, active_next) {
+ uint64_t inject_offset = rule->options.inject.offset;
+
+ if (inject_offset == -1 ||
+ (bytes && inject_offset >= offset &&
+ inject_offset < offset + bytes))
+ {
+ break;
+ }
+ }
+
+ if (!rule || !rule->options.inject.error) {
+ return 0;
+ }
+
+ immediately = rule->options.inject.immediately;
+ error = rule->options.inject.error;
if (rule->options.inject.once) {
QSIMPLEQ_REMOVE(&s->active_rules, rule, BlkdebugRule, active_next);
blkdebug_co_preadv(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
QEMUIOVector *qiov, int flags)
{
- BDRVBlkdebugState *s = bs->opaque;
- BlkdebugRule *rule = NULL;
-
- QSIMPLEQ_FOREACH(rule, &s->active_rules, active_next) {
- uint64_t inject_offset = rule->options.inject.offset;
+ int err;
- if (inject_offset == -1 ||
- (inject_offset >= offset && inject_offset < offset + bytes))
- {
- break;
- }
+ /* Sanity check block layer guarantees */
+ assert(QEMU_IS_ALIGNED(offset, bs->bl.request_alignment));
+ assert(QEMU_IS_ALIGNED(bytes, bs->bl.request_alignment));
+ if (bs->bl.max_transfer) {
+ assert(bytes <= bs->bl.max_transfer);
}
- if (rule && rule->options.inject.error) {
- return inject_error(bs, rule);
+ err = rule_check(bs, offset, bytes);
+ if (err) {
+ return err;
}
return bdrv_co_preadv(bs->file, offset, bytes, qiov, flags);
blkdebug_co_pwritev(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
QEMUIOVector *qiov, int flags)
{
- BDRVBlkdebugState *s = bs->opaque;
- BlkdebugRule *rule = NULL;
+ int err;
- QSIMPLEQ_FOREACH(rule, &s->active_rules, active_next) {
- uint64_t inject_offset = rule->options.inject.offset;
-
- if (inject_offset == -1 ||
- (inject_offset >= offset && inject_offset < offset + bytes))
- {
- break;
- }
+ /* Sanity check block layer guarantees */
+ assert(QEMU_IS_ALIGNED(offset, bs->bl.request_alignment));
+ assert(QEMU_IS_ALIGNED(bytes, bs->bl.request_alignment));
+ if (bs->bl.max_transfer) {
+ assert(bytes <= bs->bl.max_transfer);
}
- if (rule && rule->options.inject.error) {
- return inject_error(bs, rule);
+ err = rule_check(bs, offset, bytes);
+ if (err) {
+ return err;
}
return bdrv_co_pwritev(bs->file, offset, bytes, qiov, flags);
static int blkdebug_co_flush(BlockDriverState *bs)
{
- BDRVBlkdebugState *s = bs->opaque;
- BlkdebugRule *rule = NULL;
+ int err = rule_check(bs, 0, 0);
- QSIMPLEQ_FOREACH(rule, &s->active_rules, active_next) {
- if (rule->options.inject.offset == -1) {
- break;
- }
+ if (err) {
+ return err;
}
- if (rule && rule->options.inject.error) {
- return inject_error(bs, rule);
+ return bdrv_co_flush(bs->file->bs);
+}
+
+static int coroutine_fn blkdebug_co_pwrite_zeroes(BlockDriverState *bs,
+ int64_t offset, int count,
+ BdrvRequestFlags flags)
+{
+ uint32_t align = MAX(bs->bl.request_alignment,
+ bs->bl.pwrite_zeroes_alignment);
+ int err;
+
+ /* Only pass through requests that are larger than requested
+ * preferred alignment (so that we test the fallback to writes on
+ * unaligned portions), and check that the block layer never hands
+ * us anything unaligned that crosses an alignment boundary. */
+ if (count < align) {
+ assert(QEMU_IS_ALIGNED(offset, align) ||
+ QEMU_IS_ALIGNED(offset + count, align) ||
+ DIV_ROUND_UP(offset, align) ==
+ DIV_ROUND_UP(offset + count, align));
+ return -ENOTSUP;
+ }
+ assert(QEMU_IS_ALIGNED(offset, align));
+ assert(QEMU_IS_ALIGNED(count, align));
+ if (bs->bl.max_pwrite_zeroes) {
+ assert(count <= bs->bl.max_pwrite_zeroes);
}
- return bdrv_co_flush(bs->file->bs);
+ err = rule_check(bs, offset, count);
+ if (err) {
+ return err;
+ }
+
+ return bdrv_co_pwrite_zeroes(bs->file, offset, count, flags);
}
+static int coroutine_fn blkdebug_co_pdiscard(BlockDriverState *bs,
+ int64_t offset, int count)
+{
+ uint32_t align = bs->bl.pdiscard_alignment;
+ int err;
+
+ /* Only pass through requests that are larger than requested
+ * minimum alignment, and ensure that unaligned requests do not
+ * cross optimum discard boundaries. */
+ if (count < bs->bl.request_alignment) {
+ assert(QEMU_IS_ALIGNED(offset, align) ||
+ QEMU_IS_ALIGNED(offset + count, align) ||
+ DIV_ROUND_UP(offset, align) ==
+ DIV_ROUND_UP(offset + count, align));
+ return -ENOTSUP;
+ }
+ assert(QEMU_IS_ALIGNED(offset, bs->bl.request_alignment));
+ assert(QEMU_IS_ALIGNED(count, bs->bl.request_alignment));
+ if (align && count >= align) {
+ assert(QEMU_IS_ALIGNED(offset, align));
+ assert(QEMU_IS_ALIGNED(count, align));
+ }
+ if (bs->bl.max_pdiscard) {
+ assert(count <= bs->bl.max_pdiscard);
+ }
+
+ err = rule_check(bs, offset, count);
+ if (err) {
+ return err;
+ }
+
+ return bdrv_co_pdiscard(bs->file->bs, offset, count);
+}
static void blkdebug_close(BlockDriverState *bs)
{
static int blkdebug_truncate(BlockDriverState *bs, int64_t offset)
{
- return bdrv_truncate(bs->file, offset);
+ return bdrv_truncate(bs->file, offset, NULL);
}
static void blkdebug_refresh_filename(BlockDriverState *bs, QDict *options)
}
if (!force_json && bs->file->bs->exact_filename[0]) {
- snprintf(bs->exact_filename, sizeof(bs->exact_filename),
- "blkdebug:%s:%s", s->config_file ?: "",
- bs->file->bs->exact_filename);
+ int ret = snprintf(bs->exact_filename, sizeof(bs->exact_filename),
+ "blkdebug:%s:%s", s->config_file ?: "",
+ bs->file->bs->exact_filename);
+ if (ret >= sizeof(bs->exact_filename)) {
+ /* An overflow makes the filename unusable, so do not report any */
+ bs->exact_filename[0] = 0;
+ }
}
opts = qdict_new();
- qdict_put_obj(opts, "driver", QOBJECT(qstring_from_str("blkdebug")));
+ qdict_put_str(opts, "driver", "blkdebug");
QINCREF(bs->file->bs->full_open_options);
- qdict_put_obj(opts, "image", QOBJECT(bs->file->bs->full_open_options));
+ qdict_put(opts, "image", bs->file->bs->full_open_options);
for (e = qdict_first(options); e; e = qdict_next(options, e)) {
if (strcmp(qdict_entry_key(e), "x-image")) {
if (s->align) {
bs->bl.request_alignment = s->align;
}
+ if (s->max_transfer) {
+ bs->bl.max_transfer = s->max_transfer;
+ }
+ if (s->opt_write_zero) {
+ bs->bl.pwrite_zeroes_alignment = s->opt_write_zero;
+ }
+ if (s->max_write_zero) {
+ bs->bl.max_pwrite_zeroes = s->max_write_zero;
+ }
+ if (s->opt_discard) {
+ bs->bl.pdiscard_alignment = s->opt_discard;
+ }
+ if (s->max_discard) {
+ bs->bl.max_pdiscard = s->max_discard;
+ }
}
static int blkdebug_reopen_prepare(BDRVReopenState *reopen_state,
.bdrv_co_preadv = blkdebug_co_preadv,
.bdrv_co_pwritev = blkdebug_co_pwritev,
.bdrv_co_flush_to_disk = blkdebug_co_flush,
+ .bdrv_co_pwrite_zeroes = blkdebug_co_pwrite_zeroes,
+ .bdrv_co_pdiscard = blkdebug_co_pdiscard,
.bdrv_debug_event = blkdebug_debug_event,
.bdrv_debug_breakpoint = blkdebug_debug_breakpoint,
projects / mirror_qemu.git / blobdiff