9pfs: rename virtio-9p-local.c to 9p-local.c

This file is not virtio specific. Rename it to use generic name.

Fix comment and remove unneeded inclusion of virtio.h.

Signed-off-by: Wei Liu <wei.liu2@citrix.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>

1 files changed, 0 insertions, 1280 deletions

diff --git a/hw/9pfs/virtio-9p-local.c b/hw/9pfs/virtio-9p-local.c
deleted file mode 100644
index f1f2e2573b..0000000000
--- a/hw/9pfs/virtio-9p-local.c
+++ /dev/null
@@ -1,1280 +0,0 @@
-/*
- * 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 "hw/virtio/virtio.h"
-#include "virtio-9p.h"
-#include "virtio-9p-xattr.h"
-#include "fsdev/qemu-fsdev.h"   /* local_ops */
-#include <arpa/inet.h>
-#include <pwd.h>
-#include <grp.h>
-#include <sys/socket.h>
-#include <sys/un.h>
-#include "qemu/xattr.h"
-#include <libgen.h>
-#include <linux/fs.h>
-#ifdef CONFIG_LINUX_MAGIC_H
-#include <linux/magic.h>
-#endif
-#include <sys/ioctl.h>
-
-#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
-
-#define VIRTFS_META_DIR ".virtfs_metadata"
-
-static char *local_mapped_attr_path(FsContext *ctx, const char *path)
-{
-    int dirlen;
-    const char *name = strrchr(path, '/');
-    if (name) {
-        dirlen = name - path;
-        ++name;
-    } else {
-        name = path;
-        dirlen = 0;
-    }
-    return g_strdup_printf("%s/%.*s/%s/%s", ctx->fs_root,
-                           dirlen, path, VIRTFS_META_DIR, name);
-}
-
-static FILE *local_fopen(const char *path, const char *mode)
-{
-    int fd, o_mode = 0;
-    FILE *fp;
-    int flags = O_NOFOLLOW;
-    /*
-     * only supports two modes
-     */
-    if (mode[0] == 'r') {
-        flags |= O_RDONLY;
-    } else if (mode[0] == 'w') {
-        flags |= O_WRONLY | O_TRUNC | O_CREAT;
-        o_mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH;
-    } else {
-        return NULL;
-    }
-    fd = open(path, flags, o_mode);
-    if (fd == -1) {
-        return NULL;
-    }
-    fp = fdopen(fd, mode);
-    if (!fp) {
-        close(fd);
-    }
-    return fp;
-}
-
-#define ATTR_MAX 100
-static void local_mapped_file_attr(FsContext *ctx, const char *path,
-                                   struct stat *stbuf)
-{
-    FILE *fp;
-    char buf[ATTR_MAX];
-    char *attr_path;
-
-    attr_path = local_mapped_attr_path(ctx, path);
-    fp = local_fopen(attr_path, "r");
-    g_free(attr_path);
-    if (!fp) {
-        return;
-    }
-    memset(buf, 0, ATTR_MAX);
-    while (fgets(buf, ATTR_MAX, fp)) {
-        if (!strncmp(buf, "virtfs.uid", 10)) {
-            stbuf->st_uid = atoi(buf+11);
-        } else if (!strncmp(buf, "virtfs.gid", 10)) {
-            stbuf->st_gid = atoi(buf+11);
-        } else if (!strncmp(buf, "virtfs.mode", 11)) {
-            stbuf->st_mode = atoi(buf+12);
-        } else if (!strncmp(buf, "virtfs.rdev", 11)) {
-            stbuf->st_rdev = atoi(buf+12);
-        }
-        memset(buf, 0, ATTR_MAX);
-    }
-    fclose(fp);
-}
-
-static int local_lstat(FsContext *fs_ctx, V9fsPath *fs_path, struct stat *stbuf)
-{
-    int err;
-    char *buffer;
-    char *path = fs_path->data;
-
-    buffer = rpath(fs_ctx, path);
-    err =  lstat(buffer, stbuf);
-    if (err) {
-        goto err_out;
-    }
-    if (fs_ctx->export_flags & V9FS_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(buffer, "user.virtfs.uid", &tmp_uid, sizeof(uid_t)) > 0) {
-            stbuf->st_uid = le32_to_cpu(tmp_uid);
-        }
-        if (getxattr(buffer, "user.virtfs.gid", &tmp_gid, sizeof(gid_t)) > 0) {
-            stbuf->st_gid = le32_to_cpu(tmp_gid);
-        }
-        if (getxattr(buffer, "user.virtfs.mode",
-                    &tmp_mode, sizeof(mode_t)) > 0) {
-            stbuf->st_mode = le32_to_cpu(tmp_mode);
-        }
-        if (getxattr(buffer, "user.virtfs.rdev", &tmp_dev, sizeof(dev_t)) > 0) {
-            stbuf->st_rdev = le64_to_cpu(tmp_dev);
-        }
-    } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
-        local_mapped_file_attr(fs_ctx, path, stbuf);
-    }
-
-err_out:
-    g_free(buffer);
-    return err;
-}
-
-static int local_create_mapped_attr_dir(FsContext *ctx, const char *path)
-{
-    int err;
-    char *attr_dir;
-    char *tmp_path = g_strdup(path);
-
-    attr_dir = g_strdup_printf("%s/%s/%s",
-             ctx->fs_root, dirname(tmp_path), VIRTFS_META_DIR);
-
-    err = mkdir(attr_dir, 0700);
-    if (err < 0 && errno == EEXIST) {
-        err = 0;
-    }
-    g_free(attr_dir);
-    g_free(tmp_path);
-    return err;
-}
-
-static int local_set_mapped_file_attr(FsContext *ctx,
-                                      const char *path, FsCred *credp)
-{
-    FILE *fp;
-    int ret = 0;
-    char buf[ATTR_MAX];
-    char *attr_path;
-    int uid = -1, gid = -1, mode = -1, rdev = -1;
-
-    attr_path = local_mapped_attr_path(ctx, path);
-    fp = local_fopen(attr_path, "r");
-    if (!fp) {
-        goto create_map_file;
-    }
-    memset(buf, 0, ATTR_MAX);
-    while (fgets(buf, ATTR_MAX, fp)) {
-        if (!strncmp(buf, "virtfs.uid", 10)) {
-            uid = atoi(buf+11);
-        } else if (!strncmp(buf, "virtfs.gid", 10)) {
-            gid = atoi(buf+11);
-        } else if (!strncmp(buf, "virtfs.mode", 11)) {
-            mode = atoi(buf+12);
-        } else if (!strncmp(buf, "virtfs.rdev", 11)) {
-            rdev = atoi(buf+12);
-        }
-        memset(buf, 0, ATTR_MAX);
-    }
-    fclose(fp);
-    goto update_map_file;
-
-create_map_file:
-    ret = local_create_mapped_attr_dir(ctx, path);
-    if (ret < 0) {
-        goto err_out;
-    }
-
-update_map_file:
-    fp = local_fopen(attr_path, "w");
-    if (!fp) {
-        ret = -1;
-        goto err_out;
-    }
-
-    if (credp->fc_uid != -1) {
-        uid = credp->fc_uid;
-    }
-    if (credp->fc_gid != -1) {
-        gid = credp->fc_gid;
-    }
-    if (credp->fc_mode != -1) {
-        mode = credp->fc_mode;
-    }
-    if (credp->fc_rdev != -1) {
-        rdev = credp->fc_rdev;
-    }
-
-
-    if (uid != -1) {
-        fprintf(fp, "virtfs.uid=%d\n", uid);
-    }
-    if (gid != -1) {
-        fprintf(fp, "virtfs.gid=%d\n", gid);
-    }
-    if (mode != -1) {
-        fprintf(fp, "virtfs.mode=%d\n", mode);
-    }
-    if (rdev != -1) {
-        fprintf(fp, "virtfs.rdev=%d\n", rdev);
-    }
-    fclose(fp);
-
-err_out:
-    g_free(attr_path);
-    return ret;
-}
-
-static int local_set_xattr(const char *path, FsCred *credp)
-{
-    int err;
-
-    if (credp->fc_uid != -1) {
-        uint32_t tmp_uid = cpu_to_le32(credp->fc_uid);
-        err = setxattr(path, "user.virtfs.uid", &tmp_uid, sizeof(uid_t), 0);
-        if (err) {
-            return err;
-        }
-    }
-    if (credp->fc_gid != -1) {
-        uint32_t tmp_gid = cpu_to_le32(credp->fc_gid);
-        err = setxattr(path, "user.virtfs.gid", &tmp_gid, sizeof(gid_t), 0);
-        if (err) {
-            return err;
-        }
-    }
-    if (credp->fc_mode != -1) {
-        uint32_t tmp_mode = cpu_to_le32(credp->fc_mode);
-        err = setxattr(path, "user.virtfs.mode", &tmp_mode, sizeof(mode_t), 0);
-        if (err) {
-            return err;
-        }
-    }
-    if (credp->fc_rdev != -1) {
-        uint64_t tmp_rdev = cpu_to_le64(credp->fc_rdev);
-        err = setxattr(path, "user.virtfs.rdev", &tmp_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)
-{
-    char *buffer;
-
-    buffer = rpath(fs_ctx, path);
-    if (lchown(buffer, 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->export_flags & V9FS_SEC_MASK) != V9FS_SM_NONE) {
-            goto err;
-        }
-    }
-
-    if (chmod(buffer, credp->fc_mode & 07777) < 0) {
-        goto err;
-    }
-
-    g_free(buffer);
-    return 0;
-err:
-    g_free(buffer);
-    return -1;
-}
-
-static ssize_t local_readlink(FsContext *fs_ctx, V9fsPath *fs_path,
-                              char *buf, size_t bufsz)
-{
-    ssize_t tsize = -1;
-    char *buffer;
-    char *path = fs_path->data;
-
-    if ((fs_ctx->export_flags & V9FS_SM_MAPPED) ||
-        (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE)) {
-        int fd;
-        buffer = rpath(fs_ctx, path);
-        fd = open(buffer, O_RDONLY | O_NOFOLLOW);
-        g_free(buffer);
-        if (fd == -1) {
-            return -1;
-        }
-        do {
-            tsize = read(fd, (void *)buf, bufsz);
-        } while (tsize == -1 && errno == EINTR);
-        close(fd);
-    } else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) ||
-               (fs_ctx->export_flags & V9FS_SM_NONE)) {
-        buffer = rpath(fs_ctx, path);
-        tsize = readlink(buffer, buf, bufsz);
-        g_free(buffer);
-    }
-    return tsize;
-}
-
-static int local_close(FsContext *ctx, V9fsFidOpenState *fs)
-{
-    return close(fs->fd);
-}
-
-static int local_closedir(FsContext *ctx, V9fsFidOpenState *fs)
-{
-    return closedir(fs->dir);
-}
-
-static int local_open(FsContext *ctx, V9fsPath *fs_path,
-                      int flags, V9fsFidOpenState *fs)
-{
-    char *buffer;
-    char *path = fs_path->data;
-
-    buffer = rpath(ctx, path);
-    fs->fd = open(buffer, flags | O_NOFOLLOW);
-    g_free(buffer);
-    return fs->fd;
-}
-
-static int local_opendir(FsContext *ctx,
-                         V9fsPath *fs_path, V9fsFidOpenState *fs)
-{
-    char *buffer;
-    char *path = fs_path->data;
-
-    buffer = rpath(ctx, path);
-    fs->dir = opendir(buffer);
-    g_free(buffer);
-    if (!fs->dir) {
-        return -1;
-    }
-    return 0;
-}
-
-static void local_rewinddir(FsContext *ctx, V9fsFidOpenState *fs)
-{
-    rewinddir(fs->dir);
-}
-
-static off_t local_telldir(FsContext *ctx, V9fsFidOpenState *fs)
-{
-    return telldir(fs->dir);
-}
-
-static int local_readdir_r(FsContext *ctx, V9fsFidOpenState *fs,
-                           struct dirent *entry,
-                           struct dirent **result)
-{
-    int ret;
-
-again:
-    ret = readdir_r(fs->dir, entry, result);
-    if (ctx->export_flags & V9FS_SM_MAPPED) {
-        entry->d_type = DT_UNKNOWN;
-    } else if (ctx->export_flags & V9FS_SM_MAPPED_FILE) {
-        if (!ret && *result != NULL &&
-            !strcmp(entry->d_name, VIRTFS_META_DIR)) {
-            /* skp the meta data directory */
-            goto again;
-        }
-        entry->d_type = DT_UNKNOWN;
-    }
-    return ret;
-}
-
-static void local_seekdir(FsContext *ctx, V9fsFidOpenState *fs, off_t off)
-{
-    seekdir(fs->dir, off);
-}
-
-static ssize_t local_preadv(FsContext *ctx, V9fsFidOpenState *fs,
-                            const struct iovec *iov,
-                            int iovcnt, off_t offset)
-{
-#ifdef CONFIG_PREADV
-    return preadv(fs->fd, iov, iovcnt, offset);
-#else
-    int err = lseek(fs->fd, offset, SEEK_SET);
-    if (err == -1) {
-        return err;
-    } else {
-        return readv(fs->fd, iov, iovcnt);
-    }
-#endif
-}
-
-static ssize_t local_pwritev(FsContext *ctx, V9fsFidOpenState *fs,
-                             const struct iovec *iov,
-                             int iovcnt, off_t offset)
-{
-    ssize_t ret
-;
-#ifdef CONFIG_PREADV
-    ret = pwritev(fs->fd, iov, iovcnt, offset);
-#else
-    int err = lseek(fs->fd, offset, SEEK_SET);
-    if (err == -1) {
-        return err;
-    } else {
-        ret = writev(fs->fd, iov, iovcnt);
-    }
-#endif
-#ifdef CONFIG_SYNC_FILE_RANGE
-    if (ret > 0 && ctx->export_flags & V9FS_IMMEDIATE_WRITEOUT) {
-        /*
-         * Initiate a writeback. This is not a data integrity sync.
-         * We want to ensure that we don't leave dirty pages in the cache
-         * after write when writeout=immediate is sepcified.
-         */
-        sync_file_range(fs->fd, offset, ret,
-                        SYNC_FILE_RANGE_WAIT_BEFORE | SYNC_FILE_RANGE_WRITE);
-    }
-#endif
-    return ret;
-}
-
-static int local_chmod(FsContext *fs_ctx, V9fsPath *fs_path, FsCred *credp)
-{
-    char *buffer;
-    int ret = -1;
-    char *path = fs_path->data;
-
-    if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
-        buffer = rpath(fs_ctx, path);
-        ret = local_set_xattr(buffer, credp);
-        g_free(buffer);
-    } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
-        return local_set_mapped_file_attr(fs_ctx, path, credp);
-    } else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) ||
-               (fs_ctx->export_flags & V9FS_SM_NONE)) {
-        buffer = rpath(fs_ctx, path);
-        ret = chmod(buffer, credp->fc_mode);
-        g_free(buffer);
-    }
-    return ret;
-}
-
-static int local_mknod(FsContext *fs_ctx, V9fsPath *dir_path,
-                       const char *name, FsCred *credp)
-{
-    char *path;
-    int err = -1;
-    int serrno = 0;
-    V9fsString fullname;
-    char *buffer = NULL;
-
-    v9fs_string_init(&fullname);
-    v9fs_string_sprintf(&fullname, "%s/%s", dir_path->data, name);
-    path = fullname.data;
-
-    /* Determine the security model */
-    if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
-        buffer = rpath(fs_ctx, path);
-        err = mknod(buffer, SM_LOCAL_MODE_BITS|S_IFREG, 0);
-        if (err == -1) {
-            goto out;
-        }
-        err = local_set_xattr(buffer, credp);
-        if (err == -1) {
-            serrno = errno;
-            goto err_end;
-        }
-    } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
-
-        buffer = rpath(fs_ctx, path);
-        err = mknod(buffer, SM_LOCAL_MODE_BITS|S_IFREG, 0);
-        if (err == -1) {
-            goto out;
-        }
-        err = local_set_mapped_file_attr(fs_ctx, path, credp);
-        if (err == -1) {
-            serrno = errno;
-            goto err_end;
-        }
-    } else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) ||
-               (fs_ctx->export_flags & V9FS_SM_NONE)) {
-        buffer = rpath(fs_ctx, path);
-        err = mknod(buffer, credp->fc_mode, credp->fc_rdev);
-        if (err == -1) {
-            goto out;
-        }
-        err = local_post_create_passthrough(fs_ctx, path, credp);
-        if (err == -1) {
-            serrno = errno;
-            goto err_end;
-        }
-    }
-    goto out;
-
-err_end:
-    remove(buffer);
-    errno = serrno;
-out:
-    g_free(buffer);
-    v9fs_string_free(&fullname);
-    return err;
-}
-
-static int local_mkdir(FsContext *fs_ctx, V9fsPath *dir_path,
-                       const char *name, FsCred *credp)
-{
-    char *path;
-    int err = -1;
-    int serrno = 0;
-    V9fsString fullname;
-    char *buffer = NULL;
-
-    v9fs_string_init(&fullname);
-    v9fs_string_sprintf(&fullname, "%s/%s", dir_path->data, name);
-    path = fullname.data;
-
-    /* Determine the security model */
-    if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
-        buffer = rpath(fs_ctx, path);
-        err = mkdir(buffer, SM_LOCAL_DIR_MODE_BITS);
-        if (err == -1) {
-            goto out;
-        }
-        credp->fc_mode = credp->fc_mode|S_IFDIR;
-        err = local_set_xattr(buffer, credp);
-        if (err == -1) {
-            serrno = errno;
-            goto err_end;
-        }
-    } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
-        buffer = rpath(fs_ctx, path);
-        err = mkdir(buffer, SM_LOCAL_DIR_MODE_BITS);
-        if (err == -1) {
-            goto out;
-        }
-        credp->fc_mode = credp->fc_mode|S_IFDIR;
-        err = local_set_mapped_file_attr(fs_ctx, path, credp);
-        if (err == -1) {
-            serrno = errno;
-            goto err_end;
-        }
-    } else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) ||
-               (fs_ctx->export_flags & V9FS_SM_NONE)) {
-        buffer = rpath(fs_ctx, path);
-        err = mkdir(buffer, credp->fc_mode);
-        if (err == -1) {
-            goto out;
-        }
-        err = local_post_create_passthrough(fs_ctx, path, credp);
-        if (err == -1) {
-            serrno = errno;
-            goto err_end;
-        }
-    }
-    goto out;
-
-err_end:
-    remove(buffer);
-    errno = serrno;
-out:
-    g_free(buffer);
-    v9fs_string_free(&fullname);
-    return err;
-}
-
-static int local_fstat(FsContext *fs_ctx, int fid_type,
-                       V9fsFidOpenState *fs, struct stat *stbuf)
-{
-    int err, fd;
-
-    if (fid_type == P9_FID_DIR) {
-        fd = dirfd(fs->dir);
-    } else {
-        fd = fs->fd;
-    }
-
-    err = fstat(fd, stbuf);
-    if (err) {
-        return err;
-    }
-    if (fs_ctx->export_flags & V9FS_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 = le32_to_cpu(tmp_uid);
-        }
-        if (fgetxattr(fd, "user.virtfs.gid", &tmp_gid, sizeof(gid_t)) > 0) {
-            stbuf->st_gid = le32_to_cpu(tmp_gid);
-        }
-        if (fgetxattr(fd, "user.virtfs.mode", &tmp_mode, sizeof(mode_t)) > 0) {
-            stbuf->st_mode = le32_to_cpu(tmp_mode);
-        }
-        if (fgetxattr(fd, "user.virtfs.rdev", &tmp_dev, sizeof(dev_t)) > 0) {
-            stbuf->st_rdev = le64_to_cpu(tmp_dev);
-        }
-    } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
-        errno = EOPNOTSUPP;
-        return -1;
-    }
-    return err;
-}
-
-static int local_open2(FsContext *fs_ctx, V9fsPath *dir_path, const char *name,
-                       int flags, FsCred *credp, V9fsFidOpenState *fs)
-{
-    char *path;
-    int fd = -1;
-    int err = -1;
-    int serrno = 0;
-    V9fsString fullname;
-    char *buffer = NULL;
-
-    /*
-     * Mark all the open to not follow symlinks
-     */
-    flags |= O_NOFOLLOW;
-
-    v9fs_string_init(&fullname);
-    v9fs_string_sprintf(&fullname, "%s/%s", dir_path->data, name);
-    path = fullname.data;
-
-    /* Determine the security model */
-    if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
-        buffer = rpath(fs_ctx, path);
-        fd = open(buffer, flags, SM_LOCAL_MODE_BITS);
-        if (fd == -1) {
-            err = fd;
-            goto out;
-        }
-        credp->fc_mode = credp->fc_mode|S_IFREG;
-        /* Set cleint credentials in xattr */
-        err = local_set_xattr(buffer, credp);
-        if (err == -1) {
-            serrno = errno;
-            goto err_end;
-        }
-    } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
-        buffer = rpath(fs_ctx, path);
-        fd = open(buffer, flags, SM_LOCAL_MODE_BITS);
-        if (fd == -1) {
-            err = fd;
-            goto out;
-        }
-        credp->fc_mode = credp->fc_mode|S_IFREG;
-        /* Set client credentials in .virtfs_metadata directory files */
-        err = local_set_mapped_file_attr(fs_ctx, path, credp);
-        if (err == -1) {
-            serrno = errno;
-            goto err_end;
-        }
-    } else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) ||
-               (fs_ctx->export_flags & V9FS_SM_NONE)) {
-        buffer = rpath(fs_ctx, path);
-        fd = open(buffer, flags, credp->fc_mode);
-        if (fd == -1) {
-            err = fd;
-            goto out;
-        }
-        err = local_post_create_passthrough(fs_ctx, path, credp);
-        if (err == -1) {
-            serrno = errno;
-            goto err_end;
-        }
-    }
-    err = fd;
-    fs->fd = fd;
-    goto out;
-
-err_end:
-    close(fd);
-    remove(buffer);
-    errno = serrno;
-out:
-    g_free(buffer);
-    v9fs_string_free(&fullname);
-    return err;
-}
-
-
-static int local_symlink(FsContext *fs_ctx, const char *oldpath,
-                         V9fsPath *dir_path, const char *name, FsCred *credp)
-{
-    int err = -1;
-    int serrno = 0;
-    char *newpath;
-    V9fsString fullname;
-    char *buffer = NULL;
-
-    v9fs_string_init(&fullname);
-    v9fs_string_sprintf(&fullname, "%s/%s", dir_path->data, name);
-    newpath = fullname.data;
-
-    /* Determine the security model */
-    if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
-        int fd;
-        ssize_t oldpath_size, write_size;
-        buffer = rpath(fs_ctx, newpath);
-        fd = open(buffer, O_CREAT|O_EXCL|O_RDWR|O_NOFOLLOW, SM_LOCAL_MODE_BITS);
-        if (fd == -1) {
-            err = fd;
-            goto out;
-        }
-        /* Write the oldpath (target) to the file. */
-        oldpath_size = strlen(oldpath);
-        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(buffer, credp);
-        if (err == -1) {
-            serrno = errno;
-            goto err_end;
-        }
-    } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
-        int fd;
-        ssize_t oldpath_size, write_size;
-        buffer = rpath(fs_ctx, newpath);
-        fd = open(buffer, O_CREAT|O_EXCL|O_RDWR|O_NOFOLLOW, SM_LOCAL_MODE_BITS);
-        if (fd == -1) {
-            err = fd;
-            goto out;
-        }
-        /* Write the oldpath (target) to the file. */
-        oldpath_size = strlen(oldpath);
-        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_mapped_file_attr(fs_ctx, newpath, credp);
-        if (err == -1) {
-            serrno = errno;
-            goto err_end;
-        }
-    } else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) ||
-               (fs_ctx->export_flags & V9FS_SM_NONE)) {
-        buffer = rpath(fs_ctx, newpath);
-        err = symlink(oldpath, buffer);
-        if (err) {
-            goto out;
-        }
-        err = lchown(buffer, 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->export_flags & V9FS_SEC_MASK) != V9FS_SM_NONE) {
-                serrno = errno;
-                goto err_end;
-            } else
-                err = 0;
-        }
-    }
-    goto out;
-
-err_end:
-    remove(buffer);
-    errno = serrno;
-out:
-    g_free(buffer);
-    v9fs_string_free(&fullname);
-    return err;
-}
-
-static int local_link(FsContext *ctx, V9fsPath *oldpath,
-                      V9fsPath *dirpath, const char *name)
-{
-    int ret;
-    V9fsString newpath;
-    char *buffer, *buffer1;
-
-    v9fs_string_init(&newpath);
-    v9fs_string_sprintf(&newpath, "%s/%s", dirpath->data, name);
-
-    buffer = rpath(ctx, oldpath->data);
-    buffer1 = rpath(ctx, newpath.data);
-    ret = link(buffer, buffer1);
-    g_free(buffer);
-    g_free(buffer1);
-
-    /* now link the virtfs_metadata files */
-    if (!ret && (ctx->export_flags & V9FS_SM_MAPPED_FILE)) {
-        /* Link the .virtfs_metadata files. Create the metada directory */
-        ret = local_create_mapped_attr_dir(ctx, newpath.data);
-        if (ret < 0) {
-            goto err_out;
-        }
-        buffer = local_mapped_attr_path(ctx, oldpath->data);
-        buffer1 = local_mapped_attr_path(ctx, newpath.data);
-        ret = link(buffer, buffer1);
-        g_free(buffer);
-        g_free(buffer1);
-        if (ret < 0 && errno != ENOENT) {
-            goto err_out;
-        }
-    }
-err_out:
-    v9fs_string_free(&newpath);
-    return ret;
-}
-
-static int local_truncate(FsContext *ctx, V9fsPath *fs_path, off_t size)
-{
-    char *buffer;
-    int ret;
-    char *path = fs_path->data;
-
-    buffer = rpath(ctx, path);
-    ret = truncate(buffer, size);
-    g_free(buffer);
-    return ret;
-}
-
-static int local_rename(FsContext *ctx, const char *oldpath,
-                        const char *newpath)
-{
-    int err;
-    char *buffer, *buffer1;
-
-    if (ctx->export_flags & V9FS_SM_MAPPED_FILE) {
-        err = local_create_mapped_attr_dir(ctx, newpath);
-        if (err < 0) {
-            return err;
-        }
-        /* rename the .virtfs_metadata files */
-        buffer = local_mapped_attr_path(ctx, oldpath);
-        buffer1 = local_mapped_attr_path(ctx, newpath);
-        err = rename(buffer, buffer1);
-        g_free(buffer);
-        g_free(buffer1);
-        if (err < 0 && errno != ENOENT) {
-            return err;
-        }
-    }
-
-    buffer = rpath(ctx, oldpath);
-    buffer1 = rpath(ctx, newpath);
-    err = rename(buffer, buffer1);
-    g_free(buffer);
-    g_free(buffer1);
-    return err;
-}
-
-static int local_chown(FsContext *fs_ctx, V9fsPath *fs_path, FsCred *credp)
-{
-    char *buffer;
-    int ret = -1;
-    char *path = fs_path->data;
-
-    if ((credp->fc_uid == -1 && credp->fc_gid == -1) ||
-        (fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) ||
-        (fs_ctx->export_flags & V9FS_SM_NONE)) {
-        buffer = rpath(fs_ctx, path);
-        ret = lchown(buffer, credp->fc_uid, credp->fc_gid);
-        g_free(buffer);
-    } else if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
-        buffer = rpath(fs_ctx, path);
-        ret = local_set_xattr(buffer, credp);
-        g_free(buffer);
-    } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
-        return local_set_mapped_file_attr(fs_ctx, path, credp);
-    }
-    return ret;
-}
-
-static int local_utimensat(FsContext *s, V9fsPath *fs_path,
-                           const struct timespec *buf)
-{
-    char *buffer;
-    int ret;
-    char *path = fs_path->data;
-
-    buffer = rpath(s, path);
-    ret = qemu_utimens(buffer, buf);
-    g_free(buffer);
-    return ret;
-}
-
-static int local_remove(FsContext *ctx, const char *path)
-{
-    int err;
-    struct stat stbuf;
-    char *buffer;
-
-    if (ctx->export_flags & V9FS_SM_MAPPED_FILE) {
-        buffer = rpath(ctx, path);
-        err =  lstat(buffer, &stbuf);
-        g_free(buffer);
-        if (err) {
-            goto err_out;
-        }
-        /*
-         * If directory remove .virtfs_metadata contained in the
-         * directory
-         */
-        if (S_ISDIR(stbuf.st_mode)) {
-            buffer = g_strdup_printf("%s/%s/%s", ctx->fs_root,
-                                     path, VIRTFS_META_DIR);
-            err = remove(buffer);
-            g_free(buffer);
-            if (err < 0 && errno != ENOENT) {
-                /*
-                 * We didn't had the .virtfs_metadata file. May be file created
-                 * in non-mapped mode ?. Ignore ENOENT.
-                 */
-                goto err_out;
-            }
-        }
-        /*
-         * Now remove the name from parent directory
-         * .virtfs_metadata directory
-         */
-        buffer = local_mapped_attr_path(ctx, path);
-        err = remove(buffer);
-        g_free(buffer);
-        if (err < 0 && errno != ENOENT) {
-            /*
-             * We didn't had the .virtfs_metadata file. May be file created
-             * in non-mapped mode ?. Ignore ENOENT.
-             */
-            goto err_out;
-        }
-    }
-
-    buffer = rpath(ctx, path);
-    err = remove(buffer);
-    g_free(buffer);
-err_out:
-    return err;
-}
-
-static int local_fsync(FsContext *ctx, int fid_type,
-                       V9fsFidOpenState *fs, int datasync)
-{
-    int fd;
-
-    if (fid_type == P9_FID_DIR) {
-        fd = dirfd(fs->dir);
-    } else {
-        fd = fs->fd;
-    }
-
-    if (datasync) {
-        return qemu_fdatasync(fd);
-    } else {
-        return fsync(fd);
-    }
-}
-
-static int local_statfs(FsContext *s, V9fsPath *fs_path, struct statfs *stbuf)
-{
-    char *buffer;
-    int ret;
-    char *path = fs_path->data;
-
-    buffer = rpath(s, path);
-    ret = statfs(buffer, stbuf);
-    g_free(buffer);
-    return ret;
-}
-
-static ssize_t local_lgetxattr(FsContext *ctx, V9fsPath *fs_path,
-                               const char *name, void *value, size_t size)
-{
-    char *path = fs_path->data;
-
-    return v9fs_get_xattr(ctx, path, name, value, size);
-}
-
-static ssize_t local_llistxattr(FsContext *ctx, V9fsPath *fs_path,
-                                void *value, size_t size)
-{
-    char *path = fs_path->data;
-
-    return v9fs_list_xattr(ctx, path, value, size);
-}
-
-static int local_lsetxattr(FsContext *ctx, V9fsPath *fs_path, const char *name,
-                           void *value, size_t size, int flags)
-{
-    char *path = fs_path->data;
-
-    return v9fs_set_xattr(ctx, path, name, value, size, flags);
-}
-
-static int local_lremovexattr(FsContext *ctx, V9fsPath *fs_path,
-                              const char *name)
-{
-    char *path = fs_path->data;
-
-    return v9fs_remove_xattr(ctx, path, name);
-}
-
-static int local_name_to_path(FsContext *ctx, V9fsPath *dir_path,
-                              const char *name, V9fsPath *target)
-{
-    if (dir_path) {
-        v9fs_string_sprintf((V9fsString *)target, "%s/%s",
-                            dir_path->data, name);
-    } else {
-        v9fs_string_sprintf((V9fsString *)target, "%s", name);
-    }
-    /* Bump the size for including terminating NULL */
-    target->size++;
-    return 0;
-}
-
-static int local_renameat(FsContext *ctx, V9fsPath *olddir,
-                          const char *old_name, V9fsPath *newdir,
-                          const char *new_name)
-{
-    int ret;
-    V9fsString old_full_name, new_full_name;
-
-    v9fs_string_init(&old_full_name);
-    v9fs_string_init(&new_full_name);
-
-    v9fs_string_sprintf(&old_full_name, "%s/%s", olddir->data, old_name);
-    v9fs_string_sprintf(&new_full_name, "%s/%s", newdir->data, new_name);
-
-    ret = local_rename(ctx, old_full_name.data, new_full_name.data);
-    v9fs_string_free(&old_full_name);
-    v9fs_string_free(&new_full_name);
-    return ret;
-}
-
-static int local_unlinkat(FsContext *ctx, V9fsPath *dir,
-                          const char *name, int flags)
-{
-    int ret;
-    V9fsString fullname;
-    char *buffer;
-
-    v9fs_string_init(&fullname);
-
-    v9fs_string_sprintf(&fullname, "%s/%s", dir->data, name);
-    if (ctx->export_flags & V9FS_SM_MAPPED_FILE) {
-        if (flags == AT_REMOVEDIR) {
-            /*
-             * If directory remove .virtfs_metadata contained in the
-             * directory
-             */
-            buffer = g_strdup_printf("%s/%s/%s", ctx->fs_root,
-                                     fullname.data, VIRTFS_META_DIR);
-            ret = remove(buffer);
-            g_free(buffer);
-            if (ret < 0 && errno != ENOENT) {
-                /*
-                 * We didn't had the .virtfs_metadata file. May be file created
-                 * in non-mapped mode ?. Ignore ENOENT.
-                 */
-                goto err_out;
-            }
-        }
-        /*
-         * Now remove the name from parent directory
-         * .virtfs_metadata directory.
-         */
-        buffer = local_mapped_attr_path(ctx, fullname.data);
-        ret = remove(buffer);
-        g_free(buffer);
-        if (ret < 0 && errno != ENOENT) {
-            /*
-             * We didn't had the .virtfs_metadata file. May be file created
-             * in non-mapped mode ?. Ignore ENOENT.
-             */
-            goto err_out;
-        }
-    }
-    /* Remove the name finally */
-    buffer = rpath(ctx, fullname.data);
-    ret = remove(buffer);
-    g_free(buffer);
-
-err_out:
-    v9fs_string_free(&fullname);
-    return ret;
-}
-
-static int local_ioc_getversion(FsContext *ctx, V9fsPath *path,
-                                mode_t st_mode, uint64_t *st_gen)
-{
-#ifdef FS_IOC_GETVERSION
-    int err;
-    V9fsFidOpenState fid_open;
-
-    /*
-     * Do not try to open special files like device nodes, fifos etc
-     * We can get fd for regular files and directories only
-     */
-    if (!S_ISREG(st_mode) && !S_ISDIR(st_mode)) {
-        errno = ENOTTY;
-        return -1;
-    }
-    err = local_open(ctx, path, O_RDONLY, &fid_open);
-    if (err < 0) {
-        return err;
-    }
-    err = ioctl(fid_open.fd, FS_IOC_GETVERSION, st_gen);
-    local_close(ctx, &fid_open);
-    return err;
-#else
-    errno = ENOTTY;
-    return -1;
-#endif
-}
-
-static int local_init(FsContext *ctx)
-{
-    int err = 0;
-    struct statfs stbuf;
-
-    if (ctx->export_flags & V9FS_SM_PASSTHROUGH) {
-        ctx->xops = passthrough_xattr_ops;
-    } else if (ctx->export_flags & V9FS_SM_MAPPED) {
-        ctx->xops = mapped_xattr_ops;
-    } else if (ctx->export_flags & V9FS_SM_NONE) {
-        ctx->xops = none_xattr_ops;
-    } else if (ctx->export_flags & V9FS_SM_MAPPED_FILE) {
-        /*
-         * xattr operation for mapped-file and passthrough
-         * remain same.
-         */
-        ctx->xops = passthrough_xattr_ops;
-    }
-    ctx->export_flags |= V9FS_PATHNAME_FSCONTEXT;
-#ifdef FS_IOC_GETVERSION
-    /*
-     * use ioc_getversion only if the iocl is definied
-     */
-    err = statfs(ctx->fs_root, &stbuf);
-    if (!err) {
-        switch (stbuf.f_type) {
-        case EXT2_SUPER_MAGIC:
-        case BTRFS_SUPER_MAGIC:
-        case REISERFS_SUPER_MAGIC:
-        case XFS_SUPER_MAGIC:
-            ctx->exops.get_st_gen = local_ioc_getversion;
-            break;
-        }
-    }
-#endif
-    return err;
-}
-
-static int local_parse_opts(QemuOpts *opts, struct FsDriverEntry *fse)
-{
-    const char *sec_model = qemu_opt_get(opts, "security_model");
-    const char *path = qemu_opt_get(opts, "path");
-
-    if (!sec_model) {
-        fprintf(stderr, "security model not specified, "
-                "local fs needs security model\nvalid options are:"
-                "\tsecurity_model=[passthrough|mapped|none]\n");
-        return -1;
-    }
-
-    if (!strcmp(sec_model, "passthrough")) {
-        fse->export_flags |= V9FS_SM_PASSTHROUGH;
-    } else if (!strcmp(sec_model, "mapped") ||
-               !strcmp(sec_model, "mapped-xattr")) {
-        fse->export_flags |= V9FS_SM_MAPPED;
-    } else if (!strcmp(sec_model, "none")) {
-        fse->export_flags |= V9FS_SM_NONE;
-    } else if (!strcmp(sec_model, "mapped-file")) {
-        fse->export_flags |= V9FS_SM_MAPPED_FILE;
-    } else {
-        fprintf(stderr, "Invalid security model %s specified, valid options are"
-                "\n\t [passthrough|mapped-xattr|mapped-file|none]\n",
-                sec_model);
-        return -1;
-    }
-
-    if (!path) {
-        fprintf(stderr, "fsdev: No path specified.\n");
-        return -1;
-    }
-    fse->path = g_strdup(path);
-
-    return 0;
-}
-
-FileOperations local_ops = {
-    .parse_opts = local_parse_opts,
-    .init  = local_init,
-    .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_r = local_readdir_r,
-    .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,
-    .name_to_path = local_name_to_path,
-    .renameat  = local_renameat,
-    .unlinkat = local_unlinkat,
-};