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qemu-img: Eliminate bdrv_new_open() code duplication 

Several commands have code to create a BlockDriverState and open a file.
The bdrv_new_open() function can be used to perform these steps.  This
patch converts the qemu-img commands to actually use bdrv_new_open().

Replaced the bdrv_new_open() 'readonly' argument with bdrv_open()-style
flags to support generic flags like BDRV_O_NO_BACKING.

Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2010-04-13 10:29:34 +01:00 committed by Kevin Wolf
parent 8a22f02a88
commit f163d0736c
1 changed files with 10 additions and 73 deletions
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83
qemu-img.c
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@ -190,12 +190,11 @@ static int read_password(char *buf, int buf_size)
static BlockDriverState *bdrv_new_open(const char *filename,
const char *fmt,
int readonly)
int flags)
{
BlockDriverState *bs;
BlockDriver *drv;
char password[256];
int flags = BRDV_O_FLAGS;
bs = bdrv_new("");
if (!bs)
@ -207,9 +206,6 @@ static BlockDriverState *bdrv_new_open(const char *filename,
} else {
drv = NULL;
}
if (!readonly) {
flags |= BDRV_O_RDWR;
}
if (bdrv_open(bs, filename, flags, drv) < 0) {
error("Could not open '%s'", filename);
}
@ -349,7 +345,7 @@ static int img_create(int argc, char **argv)
}
}
bs = bdrv_new_open(backing_file->value.s, fmt, 1);
bs = bdrv_new_open(backing_file->value.s, fmt, BRDV_O_FLAGS);
bdrv_get_geometry(bs, &size);
size *= 512;
bdrv_delete(bs);
@ -384,7 +380,6 @@ static int img_check(int argc, char **argv)
{
int c, ret;
const char *filename, *fmt;
BlockDriver *drv;
BlockDriverState *bs;
fmt = NULL;
@ -405,19 +400,7 @@ static int img_check(int argc, char **argv)
help();
filename = argv[optind++];
bs = bdrv_new("");
if (!bs)
error("Not enough memory");
if (fmt) {
drv = bdrv_find_format(fmt);
if (!drv)
error("Unknown file format '%s'", fmt);
} else {
drv = NULL;
}
if (bdrv_open(bs, filename, BRDV_O_FLAGS, drv) < 0) {
error("Could not open '%s'", filename);
}
bs = bdrv_new_open(filename, fmt, BRDV_O_FLAGS);
ret = bdrv_check(bs);
switch(ret) {
case 0:
@ -443,7 +426,6 @@ static int img_commit(int argc, char **argv)
{
int c, ret;
const char *filename, *fmt;
BlockDriver *drv;
BlockDriverState *bs;
fmt = NULL;
@ -464,19 +446,7 @@ static int img_commit(int argc, char **argv)
help();
filename = argv[optind++];
bs = bdrv_new("");
if (!bs)
error("Not enough memory");
if (fmt) {
drv = bdrv_find_format(fmt);
if (!drv)
error("Unknown file format '%s'", fmt);
} else {
drv = NULL;
}
if (bdrv_open(bs, filename, BRDV_O_FLAGS | BDRV_O_RDWR, drv) < 0) {
error("Could not open '%s'", filename);
}
bs = bdrv_new_open(filename, fmt, BRDV_O_FLAGS | BDRV_O_RDWR);
ret = bdrv_commit(bs);
switch(ret) {
case 0:
@ -633,7 +603,7 @@ static int img_convert(int argc, char **argv)
total_sectors = 0;
for (bs_i = 0; bs_i < bs_n; bs_i++) {
bs[bs_i] = bdrv_new_open(argv[optind + bs_i], fmt, 1);
bs[bs_i] = bdrv_new_open(argv[optind + bs_i], fmt, BRDV_O_FLAGS);
if (!bs[bs_i])
error("Could not open '%s'", argv[optind + bs_i]);
bdrv_get_geometry(bs[bs_i], &bs_sectors);
@ -691,7 +661,7 @@ static int img_convert(int argc, char **argv)
}
}
out_bs = bdrv_new_open(out_filename, out_fmt, 0);
out_bs = bdrv_new_open(out_filename, out_fmt, BRDV_O_FLAGS | BDRV_O_RDWR);
bs_i = 0;
bs_offset = 0;
@ -889,7 +859,6 @@ static int img_info(int argc, char **argv)
{
int c;
const char *filename, *fmt;
BlockDriver *drv;
BlockDriverState *bs;
char fmt_name[128], size_buf[128], dsize_buf[128];
uint64_t total_sectors;
@ -916,19 +885,7 @@ static int img_info(int argc, char **argv)
help();
filename = argv[optind++];
bs = bdrv_new("");
if (!bs)
error("Not enough memory");
if (fmt) {
drv = bdrv_find_format(fmt);
if (!drv)
error("Unknown file format '%s'", fmt);
} else {
drv = NULL;
}
if (bdrv_open(bs, filename, BRDV_O_FLAGS | BDRV_O_NO_BACKING, drv) < 0) {
error("Could not open '%s'", filename);
}
bs = bdrv_new_open(filename, fmt, BRDV_O_FLAGS | BDRV_O_NO_BACKING);
bdrv_get_format(bs, fmt_name, sizeof(fmt_name));
bdrv_get_geometry(bs, &total_sectors);
get_human_readable_size(size_buf, sizeof(size_buf), total_sectors * 512);
@ -1028,13 +985,7 @@ static int img_snapshot(int argc, char **argv)
filename = argv[optind++];
/* Open the image */
bs = bdrv_new("");
if (!bs)
error("Not enough memory");
if (bdrv_open(bs, filename, bdrv_oflags, NULL) < 0) {
error("Could not open '%s'", filename);
}
bs = bdrv_new_open(filename, NULL, bdrv_oflags);
/* Perform the requested action */
switch(action) {
@ -1080,7 +1031,7 @@ static int img_snapshot(int argc, char **argv)
static int img_rebase(int argc, char **argv)
{
BlockDriverState *bs, *bs_old_backing, *bs_new_backing;
BlockDriver *drv, *old_backing_drv, *new_backing_drv;
BlockDriver *old_backing_drv, *new_backing_drv;
char *filename;
const char *fmt, *out_basefmt, *out_baseimg;
int c, flags, ret;
@ -1124,22 +1075,8 @@ 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.
*/
bs = bdrv_new("");
if (!bs)
error("Not enough memory");
drv = NULL;
if (fmt) {
drv = bdrv_find_format(fmt);
if (drv == NULL) {
error("Invalid format name: '%s'", fmt);
}
}
flags = BRDV_O_FLAGS | BDRV_O_RDWR | (unsafe ? BDRV_O_NO_BACKING : 0);
if (bdrv_open(bs, filename, flags, drv) < 0) {
error("Could not open '%s'", filename);
}
bs = bdrv_new_open(filename, fmt, flags);
/* Find the right drivers for the backing files */
old_backing_drv = NULL;