Similar to share-rw qdev property, this will force the opened images to
allow shared write permission of other programs.
Signed-off-by: Fam Zheng <f...@redhat.com>
---
qemu-img.c | 155 +++++++++++++++++++++++++++++++++++++++++++++++--------------
1 file changed, 119 insertions(+), 36 deletions(-)
diff --git a/qemu-img.c b/qemu-img.c
index ed24371..df88a79 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -28,6 +28,7 @@
#include "qapi/qobject-output-visitor.h"
#include "qapi/qmp/qerror.h"
#include "qapi/qmp/qjson.h"
+#include "qapi/qmp/qbool.h"
#include "qemu/cutils.h"
#include "qemu/config-file.h"
#include "qemu/option.h"
@@ -283,12 +284,15 @@ static int img_open_password(BlockBackend *blk, const
char *filename,
static BlockBackend *img_open_opts(const char *optstr,
QemuOpts *opts, int flags, bool
writethrough,
- bool quiet)
+ bool quiet, bool share_rw)
{
QDict *options;
Error *local_err = NULL;
BlockBackend *blk;
options = qemu_opts_to_qdict(opts, NULL);
+ if (share_rw) {
+ qdict_put(options, BDRV_OPT_FORCE_SHARED_WRITE, qbool_from_bool(true));
+ }
blk = blk_new_open(NULL, NULL, options, flags, &local_err);
if (!blk) {
error_reportf_err(local_err, "Could not open '%s': ", optstr);
@@ -305,17 +309,19 @@ static BlockBackend *img_open_opts(const char *optstr,
static BlockBackend *img_open_file(const char *filename,
const char *fmt, int flags,
- bool writethrough, bool quiet)
+ bool writethrough, bool quiet, bool
share_rw)
{
BlockBackend *blk;
Error *local_err = NULL;
- QDict *options = NULL;
+ QDict *options = qdict_new();
if (fmt) {
- options = qdict_new();
qdict_put(options, "driver", qstring_from_str(fmt));
}
+ if (share_rw) {
+ qdict_put(options, BDRV_OPT_FORCE_SHARED_WRITE, qbool_from_bool(true));
+ }
blk = blk_new_open(filename, NULL, options, flags, &local_err);
if (!blk) {
error_reportf_err(local_err, "Could not open '%s': ", filename);
@@ -334,7 +340,7 @@ static BlockBackend *img_open_file(const char *filename,
static BlockBackend *img_open(bool image_opts,
const char *filename,
const char *fmt, int flags, bool writethrough,
- bool quiet)
+ bool quiet, bool share_rw)
{
BlockBackend *blk;
if (image_opts) {
@@ -348,9 +354,9 @@ static BlockBackend *img_open(bool image_opts,
if (!opts) {
return NULL;
}
- blk = img_open_opts(filename, opts, flags, writethrough, quiet);
+ blk = img_open_opts(filename, opts, flags, writethrough, quiet,
share_rw);
} else {
- blk = img_open_file(filename, fmt, flags, writethrough, quiet);
+ blk = img_open_file(filename, fmt, flags, writethrough, quiet,
share_rw);
}
return blk;
}
@@ -650,6 +656,7 @@ static int img_check(int argc, char **argv)
ImageCheck *check;
bool quiet = false;
bool image_opts = false;
+ bool share_rw = false;
fmt = NULL;
output = NULL;
@@ -664,9 +671,10 @@ static int img_check(int argc, char **argv)
{"output", required_argument, 0, OPTION_OUTPUT},
{"object", required_argument, 0, OPTION_OBJECT},
{"image-opts", no_argument, 0, OPTION_IMAGE_OPTS},
+ {"share-rw", no_argument, 0, 'U'},
{0, 0, 0, 0}
};
- c = getopt_long(argc, argv, ":hf:r:T:q",
+ c = getopt_long(argc, argv, ":hf:r:T:qU",
long_options, &option_index);
if (c == -1) {
break;
@@ -705,6 +713,9 @@ static int img_check(int argc, char **argv)
case 'q':
quiet = true;
break;
+ case 'U':
+ share_rw = true;
+ break;
case OPTION_OBJECT: {
QemuOpts *opts;
opts = qemu_opts_parse_noisily(&qemu_object_opts,
@@ -744,7 +755,8 @@ static int img_check(int argc, char **argv)
return 1;
}
- blk = img_open(image_opts, filename, fmt, flags, writethrough, quiet);
+ blk = img_open(image_opts, filename, fmt, flags, writethrough, quiet,
+ share_rw);
if (!blk) {
return 1;
}
@@ -864,6 +876,7 @@ static int img_commit(int argc, char **argv)
CommonBlockJobCBInfo cbi;
bool image_opts = false;
AioContext *aio_context;
+ bool share_rw = false;
fmt = NULL;
cache = BDRV_DEFAULT_CACHE;
@@ -873,9 +886,10 @@ static int img_commit(int argc, char **argv)
{"help", no_argument, 0, 'h'},
{"object", required_argument, 0, OPTION_OBJECT},
{"image-opts", no_argument, 0, OPTION_IMAGE_OPTS},
+ {"share-rw", no_argument, 0, 'U'},
{0, 0, 0, 0}
};
- c = getopt_long(argc, argv, ":f:ht:b:dpq",
+ c = getopt_long(argc, argv, ":f:ht:b:dpqU",
long_options, NULL);
if (c == -1) {
break;
@@ -910,6 +924,9 @@ static int img_commit(int argc, char **argv)
case 'q':
quiet = true;
break;
+ case 'U':
+ share_rw = true;
+ break;
case OPTION_OBJECT: {
QemuOpts *opts;
opts = qemu_opts_parse_noisily(&qemu_object_opts,
@@ -947,7 +964,8 @@ static int img_commit(int argc, char **argv)
return 1;
}
- blk = img_open(image_opts, filename, fmt, flags, writethrough, quiet);
+ blk = img_open(image_opts, filename, fmt, flags, writethrough, quiet,
+ share_rw);
if (!blk) {
return 1;
}
@@ -1206,6 +1224,7 @@ static int img_compare(int argc, char **argv)
int c, pnum;
uint64_t progress_base;
bool image_opts = false;
+ bool share_rw = false;
cache = BDRV_DEFAULT_CACHE;
for (;;) {
@@ -1213,9 +1232,10 @@ static int img_compare(int argc, char **argv)
{"help", no_argument, 0, 'h'},
{"object", required_argument, 0, OPTION_OBJECT},
{"image-opts", no_argument, 0, OPTION_IMAGE_OPTS},
+ {"share-rw", no_argument, 0, 'U'},
{0, 0, 0, 0}
};
- c = getopt_long(argc, argv, ":hf:F:T:pqs",
+ c = getopt_long(argc, argv, ":hf:F:T:pqsU",
long_options, NULL);
if (c == -1) {
break;
@@ -1248,6 +1268,9 @@ static int img_compare(int argc, char **argv)
case 's':
strict = true;
break;
+ case 'U':
+ share_rw = true;
+ break;
case OPTION_OBJECT: {
QemuOpts *opts;
opts = qemu_opts_parse_noisily(&qemu_object_opts,
@@ -1293,13 +1316,15 @@ static int img_compare(int argc, char **argv)
goto out3;
}
- blk1 = img_open(image_opts, filename1, fmt1, flags, writethrough, quiet);
+ blk1 = img_open(image_opts, filename1, fmt1, flags, writethrough, quiet,
+ share_rw);
if (!blk1) {
ret = 2;
goto out3;
}
- blk2 = img_open(image_opts, filename2, fmt2, flags, writethrough, quiet);
+ blk2 = img_open(image_opts, filename2, fmt2, flags, writethrough, quiet,
+ share_rw);
if (!blk2) {
ret = 2;
goto out2;
@@ -1934,6 +1959,7 @@ static int img_convert(int argc, char **argv)
bool writethrough, src_writethrough, quiet = false, image_opts = false,
compress = false, skip_create = false, progress = false;
int64_t ret = -EINVAL;
+ bool share_rw = false;
ImgConvertState s = (ImgConvertState) {
/* Need at least 4k of zeros for sparse detection */
@@ -1948,9 +1974,10 @@ static int img_convert(int argc, char **argv)
{"help", no_argument, 0, 'h'},
{"object", required_argument, 0, OPTION_OBJECT},
{"image-opts", no_argument, 0, OPTION_IMAGE_OPTS},
+ {"share-rw", no_argument, 0, 'U'},
{0, 0, 0, 0}
};
- c = getopt_long(argc, argv, ":hf:O:B:ce6o:s:l:S:pt:T:qnm:W",
+ c = getopt_long(argc, argv, ":hf:O:B:ce6o:s:l:S:pt:T:qnm:WU",
long_options, NULL);
if (c == -1) {
break;
@@ -2054,6 +2081,9 @@ static int img_convert(int argc, char **argv)
case 'W':
s.wr_in_order = false;
break;
+ case 'U':
+ share_rw = true;
+ break;
case OPTION_OBJECT:
opts = qemu_opts_parse_noisily(&qemu_object_opts,
optarg, true);
@@ -2117,7 +2147,8 @@ static int img_convert(int argc, char **argv)
for (bs_i = 0; bs_i < s.src_num; bs_i++) {
s.src[bs_i] = img_open(image_opts, argv[optind + bs_i],
- fmt, src_flags, src_writethrough, quiet);
+ fmt, src_flags, src_writethrough, quiet,
+ share_rw);
if (!s.src[bs_i]) {
ret = -1;
goto out;
@@ -2262,7 +2293,8 @@ static int img_convert(int argc, char **argv)
* the bdrv_create() call which takes different params.
* Not critical right now, so fix can wait...
*/
- s.target = img_open_file(out_filename, out_fmt, flags, writethrough,
quiet);
+ s.target = img_open_file(out_filename, out_fmt, flags, writethrough, quiet,
+ share_rw);
if (!s.target) {
ret = -1;
goto out;
@@ -2413,7 +2445,7 @@ static gboolean str_equal_func(gconstpointer a,
gconstpointer b)
static ImageInfoList *collect_image_info_list(bool image_opts,
const char *filename,
const char *fmt,
- bool chain)
+ bool chain, bool share_rw)
{
ImageInfoList *head = NULL;
ImageInfoList **last = &head;
@@ -2436,7 +2468,8 @@ static ImageInfoList *collect_image_info_list(bool
image_opts,
g_hash_table_insert(filenames, (gpointer)filename, NULL);
blk = img_open(image_opts, filename, fmt,
- BDRV_O_NO_BACKING | BDRV_O_NO_IO, false, false);
+ BDRV_O_NO_BACKING | BDRV_O_NO_IO, false, false,
+ share_rw);
if (!blk) {
goto err;
}
@@ -2488,6 +2521,7 @@ static int img_info(int argc, char **argv)
const char *filename, *fmt, *output;
ImageInfoList *list;
bool image_opts = false;
+ bool share_rw = false;
fmt = NULL;
output = NULL;
@@ -2500,9 +2534,10 @@ static int img_info(int argc, char **argv)
{"backing-chain", no_argument, 0, OPTION_BACKING_CHAIN},
{"object", required_argument, 0, OPTION_OBJECT},
{"image-opts", no_argument, 0, OPTION_IMAGE_OPTS},
+ {"share-rw", no_argument, 0, 'U'},
{0, 0, 0, 0}
};
- c = getopt_long(argc, argv, ":f:h",
+ c = getopt_long(argc, argv, ":f:hU",
long_options, &option_index);
if (c == -1) {
break;
@@ -2520,6 +2555,9 @@ static int img_info(int argc, char **argv)
case 'f':
fmt = optarg;
break;
+ case 'U':
+ share_rw = true;
+ break;
case OPTION_OUTPUT:
output = optarg;
break;
@@ -2559,7 +2597,8 @@ static int img_info(int argc, char **argv)
return 1;
}
- list = collect_image_info_list(image_opts, filename, fmt, chain);
+ list = collect_image_info_list(image_opts, filename, fmt, chain,
+ share_rw);
if (!list) {
return 1;
}
@@ -2705,6 +2744,7 @@ static int img_map(int argc, char **argv)
MapEntry curr = { .length = 0 }, next;
int ret = 0;
bool image_opts = false;
+ bool share_rw = false;
fmt = NULL;
output = NULL;
@@ -2716,9 +2756,10 @@ static int img_map(int argc, char **argv)
{"output", required_argument, 0, OPTION_OUTPUT},
{"object", required_argument, 0, OPTION_OBJECT},
{"image-opts", no_argument, 0, OPTION_IMAGE_OPTS},
+ {"share-rw", no_argument, 0, 'U'},
{0, 0, 0, 0}
};
- c = getopt_long(argc, argv, ":f:h",
+ c = getopt_long(argc, argv, ":f:hU",
long_options, &option_index);
if (c == -1) {
break;
@@ -2736,6 +2777,9 @@ static int img_map(int argc, char **argv)
case 'f':
fmt = optarg;
break;
+ case 'U':
+ share_rw = true;
+ break;
case OPTION_OUTPUT:
output = optarg;
break;
@@ -2772,7 +2816,7 @@ static int img_map(int argc, char **argv)
return 1;
}
- blk = img_open(image_opts, filename, fmt, 0, false, false);
+ blk = img_open(image_opts, filename, fmt, 0, false, false, share_rw);
if (!blk) {
return 1;
}
@@ -2835,6 +2879,7 @@ static int img_snapshot(int argc, char **argv)
bool quiet = false;
Error *err = NULL;
bool image_opts = false;
+ bool share_rw = false;
bdrv_oflags = BDRV_O_RDWR;
/* Parse commandline parameters */
@@ -2843,9 +2888,10 @@ static int img_snapshot(int argc, char **argv)
{"help", no_argument, 0, 'h'},
{"object", required_argument, 0, OPTION_OBJECT},
{"image-opts", no_argument, 0, OPTION_IMAGE_OPTS},
+ {"share-rw", no_argument, 0, 'U'},
{0, 0, 0, 0}
};
- c = getopt_long(argc, argv, ":la:c:d:hq",
+ c = getopt_long(argc, argv, ":la:c:d:hqU",
long_options, NULL);
if (c == -1) {
break;
@@ -2895,6 +2941,9 @@ static int img_snapshot(int argc, char **argv)
case 'q':
quiet = true;
break;
+ case 'U':
+ share_rw = true;
+ break;
case OPTION_OBJECT: {
QemuOpts *opts;
opts = qemu_opts_parse_noisily(&qemu_object_opts,
@@ -2921,7 +2970,8 @@ static int img_snapshot(int argc, char **argv)
}
/* Open the image */
- blk = img_open(image_opts, filename, NULL, bdrv_oflags, false, quiet);
+ blk = img_open(image_opts, filename, NULL, bdrv_oflags, false, quiet,
+ share_rw);
if (!blk) {
return 1;
}
@@ -2985,6 +3035,7 @@ static int img_rebase(int argc, char **argv)
int c, flags, src_flags, ret;
bool writethrough, src_writethrough;
int unsafe = 0;
+ bool share_rw = 0;
int progress = 0;
bool quiet = false;
Error *local_err = NULL;
@@ -3001,9 +3052,10 @@ static int img_rebase(int argc, char **argv)
{"help", no_argument, 0, 'h'},
{"object", required_argument, 0, OPTION_OBJECT},
{"image-opts", no_argument, 0, OPTION_IMAGE_OPTS},
+ {"share-rw", no_argument, 0, 'U'},
{0, 0, 0, 0}
};
- c = getopt_long(argc, argv, ":hf:F:b:upt:T:q",
+ c = getopt_long(argc, argv, ":hf:F:b:upt:T:qU",
long_options, NULL);
if (c == -1) {
break;
@@ -3053,6 +3105,9 @@ static int img_rebase(int argc, char **argv)
case OPTION_IMAGE_OPTS:
image_opts = true;
break;
+ case 'U':
+ share_rw = true;
+ break;
}
}
@@ -3101,7 +3156,8 @@ static int img_rebase(int argc, char **argv)
* Ignore the old backing file for unsafe rebase in case we want to correct
* the reference to a renamed or moved backing file.
*/
- blk = img_open(image_opts, filename, fmt, flags, writethrough, quiet);
+ blk = img_open(image_opts, filename, fmt, flags, writethrough, quiet,
+ share_rw);
if (!blk) {
ret = -1;
goto out;
@@ -3126,6 +3182,9 @@ static int img_rebase(int argc, char **argv)
qdict_put(options, "driver", qstring_from_str(bs->backing_format));
}
+ if (share_rw) {
+ qdict_put(options, BDRV_OPT_FORCE_SHARED_WRITE,
qbool_from_bool(true));
+ }
bdrv_get_backing_filename(bs, backing_name, sizeof(backing_name));
blk_old_backing = blk_new_open(backing_name, NULL,
options, src_flags, &local_err);
@@ -3341,6 +3400,7 @@ static int img_resize(int argc, char **argv)
bool quiet = false;
BlockBackend *blk = NULL;
QemuOpts *param;
+ bool share_rw = false;
static QemuOptsList resize_options = {
.name = "resize_options",
@@ -3373,9 +3433,10 @@ static int img_resize(int argc, char **argv)
{"help", no_argument, 0, 'h'},
{"object", required_argument, 0, OPTION_OBJECT},
{"image-opts", no_argument, 0, OPTION_IMAGE_OPTS},
+ {"share-rw", no_argument, 0, 'U'},
{0, 0, 0, 0}
};
- c = getopt_long(argc, argv, ":f:hq",
+ c = getopt_long(argc, argv, ":f:hqU",
long_options, NULL);
if (c == -1) {
break;
@@ -3396,6 +3457,9 @@ static int img_resize(int argc, char **argv)
case 'q':
quiet = true;
break;
+ case 'U':
+ share_rw = true;
+ break;
case OPTION_OBJECT: {
QemuOpts *opts;
opts = qemu_opts_parse_noisily(&qemu_object_opts,
@@ -3448,7 +3512,8 @@ static int img_resize(int argc, char **argv)
qemu_opts_del(param);
blk = img_open(image_opts, filename, fmt,
- BDRV_O_RDWR | BDRV_O_RESIZE, false, quiet);
+ BDRV_O_RDWR | BDRV_O_RESIZE, false, quiet,
+ share_rw);
if (!blk) {
ret = -1;
goto out;
@@ -3509,6 +3574,7 @@ static int img_amend(int argc, char **argv)
BlockBackend *blk = NULL;
BlockDriverState *bs = NULL;
bool image_opts = false;
+ bool share_rw = false;
cache = BDRV_DEFAULT_CACHE;
for (;;) {
@@ -3516,9 +3582,10 @@ static int img_amend(int argc, char **argv)
{"help", no_argument, 0, 'h'},
{"object", required_argument, 0, OPTION_OBJECT},
{"image-opts", no_argument, 0, OPTION_IMAGE_OPTS},
+ {"share-rw", no_argument, 0, 'U'},
{0, 0, 0, 0}
};
- c = getopt_long(argc, argv, ":ho:f:t:pq",
+ c = getopt_long(argc, argv, ":ho:f:t:pqU",
long_options, NULL);
if (c == -1) {
break;
@@ -3560,6 +3627,9 @@ static int img_amend(int argc, char **argv)
case 'q':
quiet = true;
break;
+ case 'U':
+ share_rw = true;
+ break;
case OPTION_OBJECT:
opts = qemu_opts_parse_noisily(&qemu_object_opts,
optarg, true);
@@ -3611,7 +3681,8 @@ static int img_amend(int argc, char **argv)
goto out;
}
- blk = img_open(image_opts, filename, fmt, flags, writethrough, quiet);
+ blk = img_open(image_opts, filename, fmt, flags, writethrough, quiet,
+ share_rw);
if (!blk) {
ret = -1;
goto out;
@@ -3779,6 +3850,7 @@ static int img_bench(int argc, char **argv)
bool writethrough = false;
struct timeval t1, t2;
int i;
+ bool share_rw = false;
for (;;) {
static const struct option long_options[] = {
@@ -3787,9 +3859,10 @@ static int img_bench(int argc, char **argv)
{"image-opts", no_argument, 0, OPTION_IMAGE_OPTS},
{"pattern", required_argument, 0, OPTION_PATTERN},
{"no-drain", no_argument, 0, OPTION_NO_DRAIN},
+ {"share-rw", no_argument, 0, 'U'},
{0, 0, 0, 0}
};
- c = getopt_long(argc, argv, ":hc:d:f:no:qs:S:t:w", long_options, NULL);
+ c = getopt_long(argc, argv, ":hc:d:f:no:qs:S:t:wU", long_options,
NULL);
if (c == -1) {
break;
}
@@ -3883,6 +3956,9 @@ static int img_bench(int argc, char **argv)
flags |= BDRV_O_RDWR;
is_write = true;
break;
+ case 'U':
+ share_rw = true;
+ break;
case OPTION_PATTERN:
{
unsigned long res;
@@ -3930,7 +4006,8 @@ static int img_bench(int argc, char **argv)
goto out;
}
- blk = img_open(image_opts, filename, fmt, flags, writethrough, quiet);
+ blk = img_open(image_opts, filename, fmt, flags, writethrough, quiet,
+ share_rw);
if (!blk) {
ret = -1;
goto out;
@@ -4097,6 +4174,7 @@ static int img_dd(int argc, char **argv)
const char *fmt = NULL;
int64_t size = 0;
int64_t block_count = 0, out_pos, in_pos;
+ bool share_rw = false;
struct DdInfo dd = {
.flags = 0,
.count = 0,
@@ -4125,10 +4203,11 @@ static int img_dd(int argc, char **argv)
const struct option long_options[] = {
{ "help", no_argument, 0, 'h'},
{ "image-opts", no_argument, 0, OPTION_IMAGE_OPTS},
+ { "share-rw", no_argument, 0, 'U'},
{ 0, 0, 0, 0 }
};
- while ((c = getopt_long(argc, argv, ":hf:O:", long_options, NULL))) {
+ while ((c = getopt_long(argc, argv, ":hf:O:U", long_options, NULL))) {
if (c == EOF) {
break;
}
@@ -4148,6 +4227,9 @@ static int img_dd(int argc, char **argv)
case 'h':
help();
break;
+ case 'U':
+ share_rw = true;
+ break;
case OPTION_IMAGE_OPTS:
image_opts = true;
break;
@@ -4192,7 +4274,8 @@ static int img_dd(int argc, char **argv)
ret = -1;
goto out;
}
- blk1 = img_open(image_opts, in.filename, fmt, 0, false, false);
+ blk1 = img_open(image_opts, in.filename, fmt, 0, false, false,
+ share_rw);
if (!blk1) {
ret = -1;
@@ -4260,7 +4343,7 @@ static int img_dd(int argc, char **argv)
}
blk2 = img_open(image_opts, out.filename, out_fmt, BDRV_O_RDWR,
- false, false);
+ false, false, share_rw);
if (!blk2) {
ret = -1;
--
2.9.3
