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merge: qemu-img dd: add isize parameter

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to write small images from stdin to bigger destinations

Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>
This commit is contained in:
Wolfgang Bumiller 2018-02-23 10:31:40 +01:00
parent 707e85d013
commit c854115a5f
2 changed files with 103 additions and 0 deletions
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102
debian/patches/pve/0029-qemu-img-dd-add-isize-parameter.patch vendored Normal file
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@ -0,0 +1,102 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Wolfgang Bumiller <w.bumiller@proxmox.com>
Date: Fri, 23 Feb 2018 08:43:18 +0100
Subject: [PATCH] qemu-img dd: add isize parameter
for writing small images from stdin to bigger ones
In order to distinguish between an actually unexpected and
an expected end of input.
Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>
---
qemu-img.c | 29 ++++++++++++++++++++++++++---
1 file changed, 26 insertions(+), 3 deletions(-)
diff --git a/qemu-img.c b/qemu-img.c
index 876a3623a7..2605367c59 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -4089,11 +4089,13 @@ out:
#define C_OF 010
#define C_SKIP 020
#define C_OSIZE 040
+#define C_ISIZE 0100
struct DdInfo {
unsigned int flags;
int64_t count;
int64_t osize;
+ int64_t isize;
};
struct DdIo {
@@ -4186,6 +4188,20 @@ static int img_dd_osize(const char *arg,
return 0;
}
+static int img_dd_isize(const char *arg,
+ struct DdIo *in, struct DdIo *out,
+ struct DdInfo *dd)
+{
+ dd->isize = cvtnum(arg);
+
+ if (dd->isize < 0) {
+ error_report("invalid number: '%s'", arg);
+ return 1;
+ }
+
+ return 0;
+}
+
static int img_dd(int argc, char **argv)
{
int ret = 0;
@@ -4200,12 +4216,14 @@ static int img_dd(int argc, char **argv)
int c, i;
const char *out_fmt = "raw";
const char *fmt = NULL;
- int64_t size = 0;
+ int64_t size = 0, readsize = 0;
int64_t block_count = 0, out_pos, in_pos;
bool force_share = false;
struct DdInfo dd = {
.flags = 0,
.count = 0,
+ .osize = 0,
+ .isize = -1,
};
struct DdIo in = {
.bsz = 512, /* Block size is by default 512 bytes */
@@ -4227,6 +4245,7 @@ static int img_dd(int argc, char **argv)
{ "of", img_dd_of, C_OF },
{ "skip", img_dd_skip, C_SKIP },
{ "osize", img_dd_osize, C_OSIZE },
+ { "isize", img_dd_isize, C_ISIZE },
{ NULL, NULL, 0 }
};
const struct option long_options[] = {
@@ -4433,14 +4452,18 @@ static int img_dd(int argc, char **argv)
in.buf = g_new(uint8_t, in.bsz);
- for (out_pos = 0; in_pos < size; block_count++) {
+ readsize = (dd.isize > 0) ? dd.isize : size;
+ for (out_pos = 0; in_pos < readsize; block_count++) {
int in_ret, out_ret;
- size_t in_bsz = in_pos + in.bsz > size ? size - in_pos : in.bsz;
+ size_t in_bsz = in_pos + in.bsz > readsize ? readsize - in_pos : in.bsz;
if (blk1) {
in_ret = blk_pread(blk1, in_pos, in.buf, in_bsz);
} else {
in_ret = read(STDIN_FILENO, in.buf, in_bsz);
if (in_ret == 0) {
+ if (dd.isize == 0) {
+ goto out;
+ }
/* early EOF is considered an error */
error_report("Input ended unexpectedly");
ret = -1;
--
2.11.0

1
debian/patches/series vendored
View File

@ -26,5 +26,6 @@ pve/0025-backup-modify-job-api.patch
pve/0026-backup-introduce-vma-archive-format.patch
pve/0027-adding-old-vma-files.patch
pve/0028-vma-add-throttling-options-to-drive-mapping-fifo-pro.patch
pve/0029-qemu-img-dd-add-isize-parameter.patch
extra/0001-Revert-target-i386-disable-LINT0-after-reset.patch
extra/0002-ratelimit-don-t-align-wait-time-with-slices.patch