@@ -191,6 +191,42 @@ static int v9fs_write_request(int sockfd, V9fsFileObjectRequest *request)
return 0;
}
+/* Return opened file descriptor on success or -1 on error */
+int v9fs_request(FsContext *fs_ctx, V9fsFileObjectRequest *request,
+ int *error)
+{
+ int fd;
+ pthread_mutex_lock(&fs_ctx->chroot_mutex);
+ if (fs_ctx->chroot_ioerror) {
+ *error = EIO;
+ fd = -1;
+ goto unlock;
+ }
+ v9fs_write_request(fs_ctx->chroot_socket, request);
+ fd = v9fs_receivefd(fs_ctx->chroot_socket, error);
+ if (fd == -EIO) {
+ fs_ctx->chroot_ioerror = 1;
+ }
+unlock:
+ pthread_mutex_unlock(&fs_ctx->chroot_mutex);
+ return fd;
+}
+
+/*
+ * Helper routine to open a file and return fd and error status in
+ * FdInfo structure
+ */
+static void chroot_do_open(V9fsFileObjectRequest *request, FdInfo *fd_info)
+{
+ fd_info->fi_fd = open(request->path.path, request->data.flags);
+ if (fd_info->fi_fd < 0) {
+ fd_info->fi_error = errno;
+ } else {
+ fd_info->fi_error = 0;
+ fd_info->fi_flags = FI_FDVALID;
+ }
+}
+
static int chroot_daemonize(int chroot_sock)
{
sigset_t sigset;
@@ -219,12 +255,6 @@ static int chroot_daemonize(int chroot_sock)
return 0;
}
-static void chroot_dummy(void)
-{
- (void)v9fs_receivefd;
- (void)v9fs_write_request;
-}
-
/*
* Fork a process and chroot into the share path. Communication
* between qemu process and chroot process happens via socket
@@ -270,7 +300,6 @@ int v9fs_chroot(FsContext *fs_ctx)
error = qemu_write_full(chroot_sock, &code, sizeof(code));
_exit(1);
}
- chroot_dummy();
/*
* Write 0 to chroot socket to indicate chroot process creation is
@@ -291,6 +320,16 @@ int v9fs_chroot(FsContext *fs_ctx)
chroot_sendfd(chroot_sock, &fd_info);
continue;
}
+ switch (request.data.type) {
+ case T_OPEN:
+ chroot_do_open(&request, &fd_info);
+ break;
+ default:
+ fd_info.fi_fd = 0;
+ fd_info.fi_error = EIO;
+ break;
+ }
+ chroot_sendfd(chroot_sock, &fd_info);
qemu_free((void *)request.path.path);
if (request.data.oldpath_len) {
qemu_free((void *)request.path.old_path);
@@ -37,5 +37,6 @@ typedef struct V9fsFileObjectRequest
int v9fs_chroot(FsContext *fs_ctx);
+int v9fs_request(FsContext *fs_ctx, V9fsFileObjectRequest *or, int *error);
#endif /* _QEMU_VIRTIO_9P_CHROOT_H */
@@ -13,6 +13,7 @@
#include "virtio.h"
#include "virtio-9p.h"
#include "virtio-9p-xattr.h"
+#include "virtio-9p-chroot.h"
#include <arpa/inet.h>
#include <pwd.h>
#include <grp.h>
@@ -20,6 +21,36 @@
#include <sys/un.h>
#include <attr/xattr.h>
+/* Helper routine to fill V9fsFileObjectRequest structure */
+static void fill_request(V9fsFileObjectRequest *request, const char *path,
+ FsCred *credp)
+{
+ memset(request, 0, sizeof(*request));
+ request->data.path_len = strlen(path);
+ request->path.path = qemu_strdup(path);
+ if (credp) {
+ request->data.mode = credp->fc_mode;
+ request->data.uid = credp->fc_uid;
+ request->data.gid = credp->fc_gid;
+ request->data.dev = credp->fc_rdev;
+ }
+}
+
+static int passthrough_open(FsContext *fs_ctx, const char *path, int flags)
+{
+ V9fsFileObjectRequest request;
+ int fd, error = 0;
+
+ fill_request(&request, path, NULL);
+ request.data.flags = flags;
+ request.data.type = T_OPEN;
+ fd = v9fs_request(fs_ctx, &request, &error);
+ if (fd < 0) {
+ errno = error;
+ }
+ qemu_free((void *)request.path.path);
+ return fd;
+}
static int local_lstat(FsContext *fs_ctx, const char *path, struct stat *stbuf)
{
@@ -138,14 +169,27 @@ static int local_closedir(FsContext *ctx, DIR *dir)
return closedir(dir);
}
-static int local_open(FsContext *ctx, const char *path, int flags)
+static int local_open(FsContext *fs_ctx, const char *path, int flags)
{
- return open(rpath(ctx, path), flags);
+ if (fs_ctx->fs_sm == SM_PASSTHROUGH) {
+ return passthrough_open(fs_ctx, path, flags);
+ } else {
+ return open(rpath(fs_ctx, path), flags);
+ }
}
-static DIR *local_opendir(FsContext *ctx, const char *path)
+static DIR *local_opendir(FsContext *fs_ctx, const char *path)
{
- return opendir(rpath(ctx, path));
+ if (fs_ctx->fs_sm == SM_PASSTHROUGH) {
+ int fd;
+ fd = passthrough_open(fs_ctx, path, O_DIRECTORY);
+ if (fd < 0) {
+ return NULL;
+ }
+ return fdopendir(fd);
+ } else {
+ return opendir(rpath(fs_ctx, path));
+ }
}
static void local_rewinddir(FsContext *ctx, DIR *dir)
This patch adds both server and client side support to open a file (directory) in the chroot environment Signed-off-by: M. Mohan Kumar <mohan@in.ibm.com> --- hw/9pfs/virtio-9p-chroot.c | 53 ++++++++++++++++++++++++++++++++++++++----- hw/9pfs/virtio-9p-chroot.h | 1 + hw/9pfs/virtio-9p-local.c | 52 +++++++++++++++++++++++++++++++++++++++--- 3 files changed, 95 insertions(+), 11 deletions(-)