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Re: [Qemu-block] [PATCH v0] qemu-io: add pattern file for write command
From: |
Vladimir Sementsov-Ogievskiy |
Subject: |
Re: [Qemu-block] [PATCH v0] qemu-io: add pattern file for write command |
Date: |
Wed, 29 May 2019 08:11:09 +0000 |
29.05.2019 9:48, Denis Plotnikov wrote:
> The patch allows to provide a pattern file for write
> command. There was no similar ability before.
>
> Signed-off-by: Denis Plotnikov <address@hidden>
> ---
> qemu-io-cmds.c | 58 ++++++++++++++++++++++++++++++++++++++++++++++----
> 1 file changed, 54 insertions(+), 4 deletions(-)
>
> diff --git a/qemu-io-cmds.c b/qemu-io-cmds.c
> index 09750a23ce..b93955116f 100644
> --- a/qemu-io-cmds.c
> +++ b/qemu-io-cmds.c
> @@ -21,6 +21,7 @@
> #include "qemu/option.h"
> #include "qemu/timer.h"
> #include "qemu/cutils.h"
> +#include "string.h"
>
> #define CMD_NOFILE_OK 0x01
>
> @@ -343,6 +344,35 @@ static void *qemu_io_alloc(BlockBackend *blk, size_t
> len, int pattern)
> return buf;
> }
>
> +static void *qemu_io_alloc_from_file(BlockBackend *blk, size_t len,
> + char *file_name)
> +{
> + void *buf;
> + FILE *f = fopen(file_name, "r");
> +
> + if (!f) {
> + printf("cannot open file '%s'\n", file_name);
I see, printf fro errors is preexisting in qemu-io-cmds.c, but error_report is
used here too,
I think it's better to use error_report.
> + return NULL;
> + }
> +
> + if (qemuio_misalign) {
> + len += MISALIGN_OFFSET;
> + }
> + buf = blk_blockalign(blk, len);
> + memset(buf, 0, len);
> +
> + if (!fread(buf, sizeof(char), len, f)) {
> + printf("file '%s' is empty\n", file_name);
> + free(buf);
> + return NULL;
> + }
> +
> + if (qemuio_misalign) {
> + buf += MISALIGN_OFFSET;
hmm, preexisting in qemu_io_alloc and qemu_io_free, but If I remember
correctly, pointer arithmetic
on void* is not guaranteed to work as expected here..
> + }
> + return buf;
> +}
> +
> static void qemu_io_free(void *p)
> {
> if (qemuio_misalign) {
> @@ -965,7 +995,7 @@ static const cmdinfo_t write_cmd = {
> .perm = BLK_PERM_WRITE,
> .argmin = 2,
> .argmax = -1,
> - .args = "[-bcCfnquz] [-P pattern] off len",
> + .args = "[-bcCfnquz] [-P pattern | -s source_file] off len",
> .oneline = "writes a number of bytes at a specified offset",
> .help = write_help,
> };
> @@ -974,7 +1004,7 @@ 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;
> + bool Pflag = false, zflag = false, cflag = false, sflag = false;
> int flags = 0;
> int c, cnt, ret;
> char *buf = NULL;
> @@ -983,8 +1013,9 @@ static int write_f(BlockBackend *blk, int argc, char
> **argv)
> /* Some compilers get confused and warn if this is not initialized. */
> int64_t total = 0;
> int pattern = 0xcd;
> + char file_name[255] = { 0 };
>
> - while ((c = getopt(argc, argv, "bcCfnpP:quz")) != -1) {
> + while ((c = getopt(argc, argv, "bcCfnpP:quzs:")) != -1) {
> switch (c) {
> case 'b':
> bflag = true;
> @@ -1020,6 +1051,10 @@ static int write_f(BlockBackend *blk, int argc, char
> **argv)
> case 'z':
> zflag = true;
> break;
> + case 's':
> + sflag = true;
> + strncpy(file_name, optarg, sizeof(file_name) - 1);
Maybe, g_strdup and don't care about file_name length?
> + break;
> default:
> qemuio_command_usage(&write_cmd);
> return -EINVAL;
> @@ -1056,6 +1091,14 @@ static int write_f(BlockBackend *blk, int argc, char
> **argv)
> return -EINVAL;
> }
>
> + if (sflag && Pflag) {
> + printf("-s and -P cannot be specified at the same time\n");
> + }
> +
> + if (zflag && Pflag) {
> + printf("-z and -P cannot be specified at the same time\n");
> + }
strange, that you add this last check.. I see it in master branch already.
> +
> offset = cvtnum(argv[optind]);
> if (offset < 0) {
> print_cvtnum_err(offset, argv[optind]);
> @@ -1088,7 +1131,14 @@ static int write_f(BlockBackend *blk, int argc, char
> **argv)
> }
>
> if (!zflag) {
> - buf = qemu_io_alloc(blk, count, pattern);
> + if (sflag) {
> + buf = qemu_io_alloc_from_file(blk, count, file_name);
> + if (!buf) {
> + return -EINVAL;
> + }
> + } else {
> + buf = qemu_io_alloc(blk, count, pattern);
> + }
> }
>
> gettimeofday(&t1, NULL);
>
--
Best regards,
Vladimir