virtio-9p: move 9p files around

Now that we start adding more files related to 9pfs
it make sense to move them to a separate directory

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>

1 files changed, 563 insertions, 0 deletions

diff --git a/hw/9pfs/virtio-9p-local.c b/hw/9pfs/virtio-9p-local.c
new file mode 100644
index 0000000000..a8e7525bf6
--- /dev/null
+++ b/hw/9pfs/virtio-9p-local.c
@@ -0,0 +1,563 @@
+/*
+ * Virtio 9p Posix callback
+ *
+ * Copyright IBM, Corp. 2010
+ *
+ * Authors:
+ *  Anthony Liguori   <aliguori@us.ibm.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2.  See
+ * the COPYING file in the top-level directory.
+ *
+ */
+#include "virtio.h"
+#include "virtio-9p.h"
+#include "virtio-9p-xattr.h"
+#include <arpa/inet.h>
+#include <pwd.h>
+#include <grp.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <attr/xattr.h>
+
+
+static int local_lstat(FsContext *fs_ctx, const char *path, struct stat *stbuf)
+{
+    int err;
+    err =  lstat(rpath(fs_ctx, path), stbuf);
+    if (err) {
+        return err;
+    }
+    if (fs_ctx->fs_sm == SM_MAPPED) {
+        /* Actual credentials are part of extended attrs */
+        uid_t tmp_uid;
+        gid_t tmp_gid;
+        mode_t tmp_mode;
+        dev_t tmp_dev;
+        if (getxattr(rpath(fs_ctx, path), "user.virtfs.uid", &tmp_uid,
+                    sizeof(uid_t)) > 0) {
+            stbuf->st_uid = tmp_uid;
+        }
+        if (getxattr(rpath(fs_ctx, path), "user.virtfs.gid", &tmp_gid,
+                    sizeof(gid_t)) > 0) {
+            stbuf->st_gid = tmp_gid;
+        }
+        if (getxattr(rpath(fs_ctx, path), "user.virtfs.mode", &tmp_mode,
+                    sizeof(mode_t)) > 0) {
+            stbuf->st_mode = tmp_mode;
+        }
+        if (getxattr(rpath(fs_ctx, path), "user.virtfs.rdev", &tmp_dev,
+                        sizeof(dev_t)) > 0) {
+                stbuf->st_rdev = tmp_dev;
+        }
+    }
+    return err;
+}
+
+static int local_set_xattr(const char *path, FsCred *credp)
+{
+    int err;
+    if (credp->fc_uid != -1) {
+        err = setxattr(path, "user.virtfs.uid", &credp->fc_uid, sizeof(uid_t),
+                0);
+        if (err) {
+            return err;
+        }
+    }
+    if (credp->fc_gid != -1) {
+        err = setxattr(path, "user.virtfs.gid", &credp->fc_gid, sizeof(gid_t),
+                0);
+        if (err) {
+            return err;
+        }
+    }
+    if (credp->fc_mode != -1) {
+        err = setxattr(path, "user.virtfs.mode", &credp->fc_mode,
+                sizeof(mode_t), 0);
+        if (err) {
+            return err;
+        }
+    }
+    if (credp->fc_rdev != -1) {
+        err = setxattr(path, "user.virtfs.rdev", &credp->fc_rdev,
+                sizeof(dev_t), 0);
+        if (err) {
+            return err;
+        }
+    }
+    return 0;
+}
+
+static int local_post_create_passthrough(FsContext *fs_ctx, const char *path,
+        FsCred *credp)
+{
+    if (chmod(rpath(fs_ctx, path), credp->fc_mode & 07777) < 0) {
+        return -1;
+    }
+    if (lchown(rpath(fs_ctx, path), credp->fc_uid, credp->fc_gid) < 0) {
+        /*
+         * If we fail to change ownership and if we are
+         * using security model none. Ignore the error
+         */
+        if (fs_ctx->fs_sm != SM_NONE) {
+            return -1;
+        }
+    }
+    return 0;
+}
+
+static ssize_t local_readlink(FsContext *fs_ctx, const char *path,
+        char *buf, size_t bufsz)
+{
+    ssize_t tsize = -1;
+    if (fs_ctx->fs_sm == SM_MAPPED) {
+        int fd;
+        fd = open(rpath(fs_ctx, path), O_RDONLY);
+        if (fd == -1) {
+            return -1;
+        }
+        do {
+            tsize = read(fd, (void *)buf, bufsz);
+        } while (tsize == -1 && errno == EINTR);
+        close(fd);
+        return tsize;
+    } else if ((fs_ctx->fs_sm == SM_PASSTHROUGH) ||
+               (fs_ctx->fs_sm == SM_NONE)) {
+        tsize = readlink(rpath(fs_ctx, path), buf, bufsz);
+    }
+    return tsize;
+}
+
+static int local_close(FsContext *ctx, int fd)
+{
+    return close(fd);
+}
+
+static int local_closedir(FsContext *ctx, DIR *dir)
+{
+    return closedir(dir);
+}
+
+static int local_open(FsContext *ctx, const char *path, int flags)
+{
+    return open(rpath(ctx, path), flags);
+}
+
+static DIR *local_opendir(FsContext *ctx, const char *path)
+{
+    return opendir(rpath(ctx, path));
+}
+
+static void local_rewinddir(FsContext *ctx, DIR *dir)
+{
+    return rewinddir(dir);
+}
+
+static off_t local_telldir(FsContext *ctx, DIR *dir)
+{
+    return telldir(dir);
+}
+
+static struct dirent *local_readdir(FsContext *ctx, DIR *dir)
+{
+    return readdir(dir);
+}
+
+static void local_seekdir(FsContext *ctx, DIR *dir, off_t off)
+{
+    return seekdir(dir, off);
+}
+
+static ssize_t local_preadv(FsContext *ctx, int fd, const struct iovec *iov,
+                            int iovcnt, off_t offset)
+{
+#ifdef CONFIG_PREADV
+    return preadv(fd, iov, iovcnt, offset);
+#else
+    int err = lseek(fd, offset, SEEK_SET);
+    if (err == -1) {
+        return err;
+    } else {
+        return readv(fd, iov, iovcnt);
+    }
+#endif
+}
+
+static ssize_t local_pwritev(FsContext *ctx, int fd, const struct iovec *iov,
+                            int iovcnt, off_t offset)
+{
+#ifdef CONFIG_PREADV
+    return pwritev(fd, iov, iovcnt, offset);
+#else
+    int err = lseek(fd, offset, SEEK_SET);
+    if (err == -1) {
+        return err;
+    } else {
+        return writev(fd, iov, iovcnt);
+    }
+#endif
+}
+
+static int local_chmod(FsContext *fs_ctx, const char *path, FsCred *credp)
+{
+    if (fs_ctx->fs_sm == SM_MAPPED) {
+        return local_set_xattr(rpath(fs_ctx, path), credp);
+    } else if ((fs_ctx->fs_sm == SM_PASSTHROUGH) ||
+               (fs_ctx->fs_sm == SM_NONE)) {
+        return chmod(rpath(fs_ctx, path), credp->fc_mode);
+    }
+    return -1;
+}
+
+static int local_mknod(FsContext *fs_ctx, const char *path, FsCred *credp)
+{
+    int err = -1;
+    int serrno = 0;
+
+    /* Determine the security model */
+    if (fs_ctx->fs_sm == SM_MAPPED) {
+        err = mknod(rpath(fs_ctx, path), SM_LOCAL_MODE_BITS|S_IFREG, 0);
+        if (err == -1) {
+            return err;
+        }
+        local_set_xattr(rpath(fs_ctx, path), credp);
+        if (err == -1) {
+            serrno = errno;
+            goto err_end;
+        }
+    } else if ((fs_ctx->fs_sm == SM_PASSTHROUGH) ||
+               (fs_ctx->fs_sm == SM_NONE)) {
+        err = mknod(rpath(fs_ctx, path), credp->fc_mode, credp->fc_rdev);
+        if (err == -1) {
+            return err;
+        }
+        err = local_post_create_passthrough(fs_ctx, path, credp);
+        if (err == -1) {
+            serrno = errno;
+            goto err_end;
+        }
+    }
+    return err;
+
+err_end:
+    remove(rpath(fs_ctx, path));
+    errno = serrno;
+    return err;
+}
+
+static int local_mkdir(FsContext *fs_ctx, const char *path, FsCred *credp)
+{
+    int err = -1;
+    int serrno = 0;
+
+    /* Determine the security model */
+    if (fs_ctx->fs_sm == SM_MAPPED) {
+        err = mkdir(rpath(fs_ctx, path), SM_LOCAL_DIR_MODE_BITS);
+        if (err == -1) {
+            return err;
+        }
+        credp->fc_mode = credp->fc_mode|S_IFDIR;
+        err = local_set_xattr(rpath(fs_ctx, path), credp);
+        if (err == -1) {
+            serrno = errno;
+            goto err_end;
+        }
+    } else if ((fs_ctx->fs_sm == SM_PASSTHROUGH) ||
+               (fs_ctx->fs_sm == SM_NONE)) {
+        err = mkdir(rpath(fs_ctx, path), credp->fc_mode);
+        if (err == -1) {
+            return err;
+        }
+        err = local_post_create_passthrough(fs_ctx, path, credp);
+        if (err == -1) {
+            serrno = errno;
+            goto err_end;
+        }
+    }
+    return err;
+
+err_end:
+    remove(rpath(fs_ctx, path));
+    errno = serrno;
+    return err;
+}
+
+static int local_fstat(FsContext *fs_ctx, int fd, struct stat *stbuf)
+{
+    int err;
+    err = fstat(fd, stbuf);
+    if (err) {
+        return err;
+    }
+    if (fs_ctx->fs_sm == SM_MAPPED) {
+        /* Actual credentials are part of extended attrs */
+        uid_t tmp_uid;
+        gid_t tmp_gid;
+        mode_t tmp_mode;
+        dev_t tmp_dev;
+
+        if (fgetxattr(fd, "user.virtfs.uid", &tmp_uid, sizeof(uid_t)) > 0) {
+            stbuf->st_uid = tmp_uid;
+        }
+        if (fgetxattr(fd, "user.virtfs.gid", &tmp_gid, sizeof(gid_t)) > 0) {
+            stbuf->st_gid = tmp_gid;
+        }
+        if (fgetxattr(fd, "user.virtfs.mode", &tmp_mode, sizeof(mode_t)) > 0) {
+            stbuf->st_mode = tmp_mode;
+        }
+        if (fgetxattr(fd, "user.virtfs.rdev", &tmp_dev, sizeof(dev_t)) > 0) {
+                stbuf->st_rdev = tmp_dev;
+        }
+    }
+    return err;
+}
+
+static int local_open2(FsContext *fs_ctx, const char *path, int flags,
+        FsCred *credp)
+{
+    int fd = -1;
+    int err = -1;
+    int serrno = 0;
+
+    /* Determine the security model */
+    if (fs_ctx->fs_sm == SM_MAPPED) {
+        fd = open(rpath(fs_ctx, path), flags, SM_LOCAL_MODE_BITS);
+        if (fd == -1) {
+            return fd;
+        }
+        credp->fc_mode = credp->fc_mode|S_IFREG;
+        /* Set cleint credentials in xattr */
+        err = local_set_xattr(rpath(fs_ctx, path), credp);
+        if (err == -1) {
+            serrno = errno;
+            goto err_end;
+        }
+    } else if ((fs_ctx->fs_sm == SM_PASSTHROUGH) ||
+               (fs_ctx->fs_sm == SM_NONE)) {
+        fd = open(rpath(fs_ctx, path), flags, credp->fc_mode);
+        if (fd == -1) {
+            return fd;
+        }
+        err = local_post_create_passthrough(fs_ctx, path, credp);
+        if (err == -1) {
+            serrno = errno;
+            goto err_end;
+        }
+    }
+    return fd;
+
+err_end:
+    close(fd);
+    remove(rpath(fs_ctx, path));
+    errno = serrno;
+    return err;
+}
+
+
+static int local_symlink(FsContext *fs_ctx, const char *oldpath,
+        const char *newpath, FsCred *credp)
+{
+    int err = -1;
+    int serrno = 0;
+
+    /* Determine the security model */
+    if (fs_ctx->fs_sm == SM_MAPPED) {
+        int fd;
+        ssize_t oldpath_size, write_size;
+        fd = open(rpath(fs_ctx, newpath), O_CREAT|O_EXCL|O_RDWR,
+                SM_LOCAL_MODE_BITS);
+        if (fd == -1) {
+            return fd;
+        }
+        /* Write the oldpath (target) to the file. */
+        oldpath_size = strlen(oldpath) + 1;
+        do {
+            write_size = write(fd, (void *)oldpath, oldpath_size);
+        } while (write_size == -1 && errno == EINTR);
+
+        if (write_size != oldpath_size) {
+            serrno = errno;
+            close(fd);
+            err = -1;
+            goto err_end;
+        }
+        close(fd);
+        /* Set cleint credentials in symlink's xattr */
+        credp->fc_mode = credp->fc_mode|S_IFLNK;
+        err = local_set_xattr(rpath(fs_ctx, newpath), credp);
+        if (err == -1) {
+            serrno = errno;
+            goto err_end;
+        }
+    } else if ((fs_ctx->fs_sm == SM_PASSTHROUGH) ||
+               (fs_ctx->fs_sm == SM_NONE)) {
+        err = symlink(oldpath, rpath(fs_ctx, newpath));
+        if (err) {
+            return err;
+        }
+        err = lchown(rpath(fs_ctx, newpath), credp->fc_uid, credp->fc_gid);
+        if (err == -1) {
+            /*
+             * If we fail to change ownership and if we are
+             * using security model none. Ignore the error
+             */
+            if (fs_ctx->fs_sm != SM_NONE) {
+                serrno = errno;
+                goto err_end;
+            } else
+                err = 0;
+        }
+    }
+    return err;
+
+err_end:
+    remove(rpath(fs_ctx, newpath));
+    errno = serrno;
+    return err;
+}
+
+static int local_link(FsContext *ctx, const char *oldpath, const char *newpath)
+{
+    char *tmp = qemu_strdup(rpath(ctx, oldpath));
+    int err, serrno = 0;
+
+    if (tmp == NULL) {
+        return -ENOMEM;
+    }
+
+    err = link(tmp, rpath(ctx, newpath));
+    if (err == -1) {
+        serrno = errno;
+    }
+
+    qemu_free(tmp);
+
+    if (err == -1) {
+        errno = serrno;
+    }
+
+    return err;
+}
+
+static int local_truncate(FsContext *ctx, const char *path, off_t size)
+{
+    return truncate(rpath(ctx, path), size);
+}
+
+static int local_rename(FsContext *ctx, const char *oldpath,
+                        const char *newpath)
+{
+    char *tmp;
+    int err;
+
+    tmp = qemu_strdup(rpath(ctx, oldpath));
+
+    err = rename(tmp, rpath(ctx, newpath));
+    if (err == -1) {
+        int serrno = errno;
+        qemu_free(tmp);
+        errno = serrno;
+    } else {
+        qemu_free(tmp);
+    }
+
+    return err;
+
+}
+
+static int local_chown(FsContext *fs_ctx, const char *path, FsCred *credp)
+{
+    if ((credp->fc_uid == -1 && credp->fc_gid == -1) ||
+            (fs_ctx->fs_sm == SM_PASSTHROUGH)) {
+        return lchown(rpath(fs_ctx, path), credp->fc_uid, credp->fc_gid);
+    } else if (fs_ctx->fs_sm == SM_MAPPED) {
+        return local_set_xattr(rpath(fs_ctx, path), credp);
+    } else if ((fs_ctx->fs_sm == SM_PASSTHROUGH) ||
+               (fs_ctx->fs_sm == SM_NONE)) {
+        return lchown(rpath(fs_ctx, path), credp->fc_uid, credp->fc_gid);
+    }
+    return -1;
+}
+
+static int local_utimensat(FsContext *s, const char *path,
+                           const struct timespec *buf)
+{
+    return qemu_utimensat(AT_FDCWD, rpath(s, path), buf, AT_SYMLINK_NOFOLLOW);
+}
+
+static int local_remove(FsContext *ctx, const char *path)
+{
+    return remove(rpath(ctx, path));
+}
+
+static int local_fsync(FsContext *ctx, int fd, int datasync)
+{
+    if (datasync) {
+        return qemu_fdatasync(fd);
+    } else {
+        return fsync(fd);
+    }
+}
+
+static int local_statfs(FsContext *s, const char *path, struct statfs *stbuf)
+{
+   return statfs(rpath(s, path), stbuf);
+}
+
+static ssize_t local_lgetxattr(FsContext *ctx, const char *path,
+                               const char *name, void *value, size_t size)
+{
+    return v9fs_get_xattr(ctx, path, name, value, size);
+}
+
+static ssize_t local_llistxattr(FsContext *ctx, const char *path,
+                                void *value, size_t size)
+{
+    return v9fs_list_xattr(ctx, path, value, size);
+}
+
+static int local_lsetxattr(FsContext *ctx, const char *path, const char *name,
+                           void *value, size_t size, int flags)
+{
+    return v9fs_set_xattr(ctx, path, name, value, size, flags);
+}
+
+static int local_lremovexattr(FsContext *ctx,
+                              const char *path, const char *name)
+{
+    return v9fs_remove_xattr(ctx, path, name);
+}
+
+
+FileOperations local_ops = {
+    .lstat = local_lstat,
+    .readlink = local_readlink,
+    .close = local_close,
+    .closedir = local_closedir,
+    .open = local_open,
+    .opendir = local_opendir,
+    .rewinddir = local_rewinddir,
+    .telldir = local_telldir,
+    .readdir = local_readdir,
+    .seekdir = local_seekdir,
+    .preadv = local_preadv,
+    .pwritev = local_pwritev,
+    .chmod = local_chmod,
+    .mknod = local_mknod,
+    .mkdir = local_mkdir,
+    .fstat = local_fstat,
+    .open2 = local_open2,
+    .symlink = local_symlink,
+    .link = local_link,
+    .truncate = local_truncate,
+    .rename = local_rename,
+    .chown = local_chown,
+    .utimensat = local_utimensat,
+    .remove = local_remove,
+    .fsync = local_fsync,
+    .statfs = local_statfs,
+    .lgetxattr = local_lgetxattr,
+    .llistxattr = local_llistxattr,
+    .lsetxattr = local_lsetxattr,
+    .lremovexattr = local_lremovexattr,
+};