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virtio-9p: Create a syntactic shortcut for the file-system pass-thru

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Currently the commandline to create a virtual-filesystem pass-through between
the guest and the host is as follows:
#qemu -fsdev fstype,id=ID,path=path/to/share \
      -device virtio-9p-pci,fsdev=ID,mount_tag=tag \

This patch provides a syntactic short-cut to achieve the same as follows:
#qemu -virtfs fstype,path=path/to/share,mount_tag=tag

This will be internally expanded as:
#qemu -fsdev fstype,id=tag,path=path/to/share, \
      -device virtio-9p-pci,fsdev=tag,mount_tag=tag \

Signed-off-by: Gautham R Shenoy <ego@in.ibm.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Gautham R Shenoy 2010-04-29 17:45:03 +05:30 • committed by Anthony Liguori
parent 9c5e9d8970
commit 3d54abc7b7
4 changed files with 114 additions and 0 deletions
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56
vl.c
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@ -3102,6 +3102,62 @@ int main(int argc, char **argv, char **envp)
exit(1);
}
break;
case QEMU_OPTION_virtfs: {
char *arg_fsdev = NULL;
char *arg_9p = NULL;
int len = 0;
opts = qemu_opts_parse(&qemu_virtfs_opts, optarg, 1);
if (!opts) {
fprintf(stderr, "parse error: %s\n", optarg);
exit(1);
}
len = strlen(",id=,path=");
len += strlen(qemu_opt_get(opts, "fstype"));
len += strlen(qemu_opt_get(opts, "mount_tag"));
len += strlen(qemu_opt_get(opts, "path"));
arg_fsdev = qemu_malloc((len + 1) * sizeof(*arg_fsdev));
if (!arg_fsdev) {
fprintf(stderr, "No memory to parse -fsdev for %s\n",
optarg);
exit(1);
}
sprintf(arg_fsdev, "%s,id=%s,path=%s",
qemu_opt_get(opts, "fstype"),
qemu_opt_get(opts, "mount_tag"),
qemu_opt_get(opts, "path"));
len = strlen("virtio-9p-pci,fsdev=,mount_tag=");
len += 2*strlen(qemu_opt_get(opts, "mount_tag"));
arg_9p = qemu_malloc((len + 1) * sizeof(*arg_9p));
if (!arg_9p) {
fprintf(stderr, "No memory to parse -device for %s\n",
optarg);
exit(1);
}
sprintf(arg_9p, "virtio-9p-pci,fsdev=%s,mount_tag=%s",
qemu_opt_get(opts, "mount_tag"),
qemu_opt_get(opts, "mount_tag"));
if (!qemu_opts_parse(&qemu_fsdev_opts, arg_fsdev, 1)) {
fprintf(stderr, "parse error [fsdev]: %s\n", optarg);
exit(1);
}
if (!qemu_opts_parse(&qemu_device_opts, arg_9p, 1)) {
fprintf(stderr, "parse error [device]: %s\n", optarg);
exit(1);
}
qemu_free(arg_fsdev);
qemu_free(arg_9p);
break;
}
#endif
case QEMU_OPTION_serial:
add_device_config(DEV_SERIAL, optarg);