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qemu-io: Add 'write -f' to test FUA flag

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Make it easier to test block drivers with BDRV_REQ_FUA in
.supported_write_flags, by adding the '-f' flag to qemu-io to
conditionally pass the flag through to specific writes ('write',
'write -z', 'writev', 'aio_write', 'aio_write -z'). You'll want
to use 'qemu-io -t none' to actually make -f useful (as
otherwise, the default writethrough mode automatically sets the
FUA bit on every write).

Signed-off-by: Eric Blake <eblake@redhat.com>
Message-id: 1462677405-4752-6-git-send-email-eblake@redhat.com
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Eric Blake 2016-05-07 21:16:44 -06:00 committed by Max Reitz
parent 093ea232b0
commit 770e0e0e80
1 changed files with 41 additions and 16 deletions
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57
qemu-io-cmds.c
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@ -428,13 +428,13 @@ static int do_pread(BlockBackend *blk, char *buf, int64_t offset,
}
static int do_pwrite(BlockBackend *blk, char *buf, int64_t offset,
int64_t count, int64_t *total)
int64_t count, int flags, int64_t *total)
{
if (count > INT_MAX) {
return -ERANGE;
}
*total = blk_pwrite(blk, offset, (uint8_t *)buf, count, 0);
*total = blk_pwrite(blk, offset, (uint8_t *)buf, count, flags);
if (*total < 0) {
return *total;
}
@ -446,6 +446,7 @@ typedef struct {
int64_t offset;
int64_t count;
int64_t *total;
int flags;
int ret;
bool done;
} CoWriteZeroes;
@ -454,7 +455,8 @@ static void coroutine_fn co_write_zeroes_entry(void *opaque)
{
CoWriteZeroes *data = opaque;
data->ret = blk_co_write_zeroes(data->blk, data->offset, data->count, 0);
data->ret = blk_co_write_zeroes(data->blk, data->offset, data->count,
data->flags);
data->done = true;
if (data->ret < 0) {
*data->total = data->ret;
@ -465,7 +467,7 @@ static void coroutine_fn co_write_zeroes_entry(void *opaque)
}
static int do_co_write_zeroes(BlockBackend *blk, int64_t offset, int64_t count,
int64_t *total)
int flags, int64_t *total)
{
Coroutine *co;
CoWriteZeroes data = {
@ -473,6 +475,7 @@ static int do_co_write_zeroes(BlockBackend *blk, int64_t offset, int64_t count,
.offset = offset,
.count = count,
.total = total,
.flags = flags,
.done = false,
};
@ -558,11 +561,11 @@ static int do_aio_readv(BlockBackend *blk, QEMUIOVector *qiov,
}
static int do_aio_writev(BlockBackend *blk, QEMUIOVector *qiov,
int64_t offset, int *total)
int64_t offset, int flags, int *total)
{
int async_ret = NOT_DONE;
blk_aio_pwritev(blk, offset, qiov, 0, aio_rw_done, &async_ret);
blk_aio_pwritev(blk, offset, qiov, flags, aio_rw_done, &async_ret);
while (async_ret == NOT_DONE) {
main_loop_wait(false);
}
@ -935,6 +938,7 @@ static void write_help(void)
" filled with a set pattern (0xcdcdcdcd).\n"
" -b, -- write to the VM state rather than the virtual disk\n"
" -c, -- write compressed data with blk_write_compressed\n"
" -f, -- use Force Unit Access semantics\n"
" -p, -- ignored for backwards compatibility\n"
" -P, -- use different pattern to fill file\n"
" -C, -- report statistics in a machine parsable format\n"
@ -951,7 +955,7 @@ static const cmdinfo_t write_cmd = {
.cfunc = write_f,
.argmin = 2,
.argmax = -1,
.args = "[-bcCqz] [-P pattern] off len",
.args = "[-bcCfqz] [-P pattern] off len",
.oneline = "writes a number of bytes at a specified offset",
.help = write_help,
};
@ -961,6 +965,7 @@ static int write_f(BlockBackend *blk, int argc, char **argv)
struct timeval t1, t2;
bool Cflag = false, qflag = false, bflag = false;
bool Pflag = false, zflag = false, cflag = false;
int flags = 0;
int c, cnt;
char *buf = NULL;
int64_t offset;
@ -969,7 +974,7 @@ static int write_f(BlockBackend *blk, int argc, char **argv)
int64_t total = 0;
int pattern = 0xcd;
while ((c = getopt(argc, argv, "bcCpP:qz")) != -1) {
while ((c = getopt(argc, argv, "bcCfpP:qz")) != -1) {
switch (c) {
case 'b':
bflag = true;
@ -980,6 +985,9 @@ static int write_f(BlockBackend *blk, int argc, char **argv)
case 'C':
Cflag = true;
break;
case 'f':
flags |= BDRV_REQ_FUA;
break;
case 'p':
/* Ignored for backwards compatibility */
break;
@ -1010,6 +1018,11 @@ static int write_f(BlockBackend *blk, int argc, char **argv)
return 0;
}
if ((flags & BDRV_REQ_FUA) && (bflag || cflag)) {
printf("-f and -b or -c cannot be specified at the same time\n");
return 0;
}
if (zflag && Pflag) {
printf("-z and -P cannot be specified at the same time\n");
return 0;
@ -1054,11 +1067,11 @@ static int write_f(BlockBackend *blk, int argc, char **argv)
if (bflag) {
cnt = do_save_vmstate(blk, buf, offset, count, &total);
} else if (zflag) {
cnt = do_co_write_zeroes(blk, offset, count, &total);
cnt = do_co_write_zeroes(blk, offset, count, flags, &total);
} else if (cflag) {
cnt = do_write_compressed(blk, buf, offset, count, &total);
} else {
cnt = do_pwrite(blk, buf, offset, count, &total);
cnt = do_pwrite(blk, buf, offset, count, flags, &total);
}
gettimeofday(&t2, NULL);
@ -1097,6 +1110,7 @@ writev_help(void)
" filled with a set pattern (0xcdcdcdcd).\n"
" -P, -- use different pattern to fill file\n"
" -C, -- report statistics in a machine parsable format\n"
" -f, -- use Force Unit Access semantics\n"
" -q, -- quiet mode, do not show I/O statistics\n"
"\n");
}
@ -1108,7 +1122,7 @@ static const cmdinfo_t writev_cmd = {
.cfunc = writev_f,
.argmin = 2,
.argmax = -1,
.args = "[-Cq] [-P pattern] off len [len..]",
.args = "[-Cfq] [-P pattern] off len [len..]",
.oneline = "writes a number of bytes at a specified offset",
.help = writev_help,
};
@ -1117,6 +1131,7 @@ static int writev_f(BlockBackend *blk, int argc, char **argv)
{
struct timeval t1, t2;
bool Cflag = false, qflag = false;
int flags = 0;
int c, cnt;
char *buf;
int64_t offset;
@ -1131,6 +1146,9 @@ static int writev_f(BlockBackend *blk, int argc, char **argv)
case 'C':
Cflag = true;
break;
case 'f':
flags |= BDRV_REQ_FUA;
break;
case 'q':
qflag = true;
break;
@ -1163,7 +1181,7 @@ static int writev_f(BlockBackend *blk, int argc, char **argv)
}
gettimeofday(&t1, NULL);
cnt = do_aio_writev(blk, &qiov, offset, &total);
cnt = do_aio_writev(blk, &qiov, offset, flags, &total);
gettimeofday(&t2, NULL);
if (cnt < 0) {
@ -1541,6 +1559,7 @@ static void aio_write_help(void)
" used to ensure all outstanding aio requests have been completed.\n"
" -P, -- use different pattern to fill file\n"
" -C, -- report statistics in a machine parsable format\n"
" -f, -- use Force Unit Access semantics\n"
" -q, -- quiet mode, do not show I/O statistics\n"
" -z, -- write zeroes using blk_aio_write_zeroes\n"
"\n");
@ -1553,7 +1572,7 @@ static const cmdinfo_t aio_write_cmd = {
.cfunc = aio_write_f,
.argmin = 2,
.argmax = -1,
.args = "[-Cqz] [-P pattern] off len [len..]",
.args = "[-Cfqz] [-P pattern] off len [len..]",
.oneline = "asynchronously writes a number of bytes",
.help = aio_write_help,
};
@ -1563,13 +1582,17 @@ static int aio_write_f(BlockBackend *blk, int argc, char **argv)
int nr_iov, c;
int pattern = 0xcd;
struct aio_ctx *ctx = g_new0(struct aio_ctx, 1);
int flags = 0;
ctx->blk = blk;
while ((c = getopt(argc, argv, "CqP:z")) != -1) {
while ((c = getopt(argc, argv, "CfqP:z")) != -1) {
switch (c) {
case 'C':
ctx->Cflag = true;
break;
case 'f':
flags |= BDRV_REQ_FUA;
break;
case 'q':
ctx->qflag = true;
break;
@ -1623,7 +1646,8 @@ static int aio_write_f(BlockBackend *blk, int argc, char **argv)
}
ctx->qiov.size = count;
blk_aio_write_zeroes(blk, ctx->offset, count, 0, aio_write_done, ctx);
blk_aio_write_zeroes(blk, ctx->offset, count, flags, aio_write_done,
ctx);
} else {
nr_iov = argc - optind;
ctx->buf = create_iovec(blk, &ctx->qiov, &argv[optind], nr_iov,
@ -1638,7 +1662,8 @@ static int aio_write_f(BlockBackend *blk, int argc, char **argv)
block_acct_start(blk_get_stats(blk), &ctx->acct, ctx->qiov.size,
BLOCK_ACCT_WRITE);
blk_aio_pwritev(blk, ctx->offset, &ctx->qiov, 0, aio_write_done, ctx);
blk_aio_pwritev(blk, ctx->offset, &ctx->qiov, flags, aio_write_done,
ctx);
}
return 0;
}