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authorM. Mohan Kumar <mohan@in.ibm.com>2011-12-14 13:58:46 +0530
committerAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>2012-01-04 20:20:55 +0530
commitd090e452d4a0e30b59f983dfc5cde190b6088899 (patch)
treed7eb5f0ea3c3cd98b9f3b62d1b0198824da3b438 /fsdev/virtfs-proxy-helper.c
parentd52b09e475317a723273e1a236e6d5e27613c634 (diff)
hw/9pfs: Proxy getversion
Add proxy getversion to get generation number Signed-off-by: M. Mohan Kumar <mohan@in.ibm.com> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Diffstat (limited to 'fsdev/virtfs-proxy-helper.c')
-rw-r--r--fsdev/virtfs-proxy-helper.c86
1 files changed, 86 insertions, 0 deletions
diff --git a/fsdev/virtfs-proxy-helper.c b/fsdev/virtfs-proxy-helper.c
index 703ac8567..52d748d93 100644
--- a/fsdev/virtfs-proxy-helper.c
+++ b/fsdev/virtfs-proxy-helper.c
@@ -28,6 +28,11 @@
#include <sys/vfs.h>
#include <sys/stat.h>
#include <attr/xattr.h>
+#include <sys/ioctl.h>
+#include <linux/fs.h>
+#ifdef CONFIG_LINUX_MAGIC_H
+#include <linux/magic.h>
+#endif
#include "qemu-common.h"
#include "virtio-9p-marshal.h"
#include "hw/9pfs/virtio-9p-proxy.h"
@@ -35,6 +40,19 @@
#define PROGNAME "virtfs-proxy-helper"
+#ifndef XFS_SUPER_MAGIC
+#define XFS_SUPER_MAGIC 0x58465342
+#endif
+#ifndef EXT2_SUPER_MAGIC
+#define EXT2_SUPER_MAGIC 0xEF53
+#endif
+#ifndef REISERFS_SUPER_MAGIC
+#define REISERFS_SUPER_MAGIC 0x52654973
+#endif
+#ifndef BTRFS_SUPER_MAGIC
+#define BTRFS_SUPER_MAGIC 0x9123683E
+#endif
+
static struct option helper_opts[] = {
{"fd", required_argument, NULL, 'f'},
{"path", required_argument, NULL, 'p'},
@@ -42,6 +60,7 @@ static struct option helper_opts[] = {
};
static bool is_daemon;
+static bool get_version; /* IOC getversion IOCTL supported */
static void do_log(int loglevel, const char *format, ...)
{
@@ -330,6 +349,49 @@ static int send_response(int sock, struct iovec *iovec, int size)
return 0;
}
+/*
+ * gets generation number
+ * returns -errno on failure and sizeof(generation number) on success
+ */
+static int do_getversion(struct iovec *iovec, struct iovec *out_iovec)
+{
+ uint64_t version;
+ int retval = -ENOTTY;
+#ifdef FS_IOC_GETVERSION
+ int fd;
+ V9fsString path;
+#endif
+
+
+ /* no need to issue ioctl */
+ if (!get_version) {
+ version = 0;
+ retval = proxy_marshal(out_iovec, PROXY_HDR_SZ, "q", version);
+ return retval;
+ }
+#ifdef FS_IOC_GETVERSION
+ retval = proxy_unmarshal(iovec, PROXY_HDR_SZ, "s", &path);
+ if (retval < 0) {
+ return retval;
+ }
+
+ fd = open(path.data, O_RDONLY);
+ if (fd < 0) {
+ retval = -errno;
+ goto err_out;
+ }
+ if (ioctl(fd, FS_IOC_GETVERSION, &version) < 0) {
+ retval = -errno;
+ } else {
+ retval = proxy_marshal(out_iovec, PROXY_HDR_SZ, "q", version);
+ }
+ close(fd);
+err_out:
+ v9fs_string_free(&path);
+#endif
+ return retval;
+}
+
static int do_getxattr(int type, struct iovec *iovec, struct iovec *out_iovec)
{
int size = 0, offset, retval;
@@ -673,6 +735,7 @@ static int process_reply(int sock, int type,
case T_READLINK:
case T_LGETXATTR:
case T_LLISTXATTR:
+ case T_GETVERSION:
if (send_response(sock, out_iovec, retval) < 0) {
return -1;
}
@@ -855,6 +918,9 @@ static int process_requests(int sock)
v9fs_string_free(&path);
v9fs_string_free(&name);
break;
+ case T_GETVERSION:
+ retval = do_getversion(&in_iovec, &out_iovec);
+ break;
default:
goto err_out;
break;
@@ -876,6 +942,10 @@ int main(int argc, char **argv)
char *rpath = NULL;
struct stat stbuf;
int c, option_index;
+#ifdef FS_IOC_GETVERSION
+ int retval;
+ struct statfs st_fs;
+#endif
is_daemon = true;
sock = -1;
@@ -932,6 +1002,22 @@ int main(int argc, char **argv)
do_log(LOG_INFO, "Started\n");
+ get_version = false;
+#ifdef FS_IOC_GETVERSION
+ /* check whether underlying FS support IOC_GETVERSION */
+ retval = statfs(rpath, &st_fs);
+ if (!retval) {
+ switch (st_fs.f_type) {
+ case EXT2_SUPER_MAGIC:
+ case BTRFS_SUPER_MAGIC:
+ case REISERFS_SUPER_MAGIC:
+ case XFS_SUPER_MAGIC:
+ get_version = true;
+ break;
+ }
+ }
+#endif
+
if (chdir("/") < 0) {
do_perror("chdir");
goto error;