+++ /dev/null
-/*
- * Virtio 9p synthetic file system support
- *
- * Copyright IBM, Corp. 2011
- *
- * Authors:
- * Malahal Naineni <malahal@us.ibm.com>
- * Aneesh Kumar K.V <aneesh.kumar@linux.vnet.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"
-#include "virtio-9p-synth.h"
-#include "qemu/rcu.h"
-#include "qemu/rcu_queue.h"
-#include <sys/stat.h>
-
-/* Root node for synth file system */
-static V9fsSynthNode v9fs_synth_root = {
- .name = "/",
- .actual_attr = {
- .mode = 0555 | S_IFDIR,
- .nlink = 1,
- },
- .attr = &v9fs_synth_root.actual_attr,
-};
-
-static QemuMutex v9fs_synth_mutex;
-static int v9fs_synth_node_count;
-/* set to 1 when the synth fs is ready */
-static int v9fs_synth_fs;
-
-static V9fsSynthNode *v9fs_add_dir_node(V9fsSynthNode *parent, int mode,
- const char *name,
- V9fsSynthNodeAttr *attr, int inode)
-{
- V9fsSynthNode *node;
-
- /* Add directory type and remove write bits */
- mode = ((mode & 0777) | S_IFDIR) & ~(S_IWUSR | S_IWGRP | S_IWOTH);
- node = g_malloc0(sizeof(V9fsSynthNode));
- if (attr) {
- /* We are adding .. or . entries */
- node->attr = attr;
- node->attr->nlink++;
- } else {
- node->attr = &node->actual_attr;
- node->attr->inode = inode;
- node->attr->nlink = 1;
- /* We don't allow write to directories */
- node->attr->mode = mode;
- node->attr->write = NULL;
- node->attr->read = NULL;
- }
- node->private = node;
- pstrcpy(node->name, sizeof(node->name), name);
- QLIST_INSERT_HEAD_RCU(&parent->child, node, sibling);
- return node;
-}
-
-int qemu_v9fs_synth_mkdir(V9fsSynthNode *parent, int mode,
- const char *name, V9fsSynthNode **result)
-{
- int ret;
- V9fsSynthNode *node, *tmp;
-
- if (!v9fs_synth_fs) {
- return EAGAIN;
- }
- if (!name || (strlen(name) >= NAME_MAX)) {
- return EINVAL;
- }
- if (!parent) {
- parent = &v9fs_synth_root;
- }
- qemu_mutex_lock(&v9fs_synth_mutex);
- QLIST_FOREACH(tmp, &parent->child, sibling) {
- if (!strcmp(tmp->name, name)) {
- ret = EEXIST;
- goto err_out;
- }
- }
- /* Add the name */
- node = v9fs_add_dir_node(parent, mode, name, NULL, v9fs_synth_node_count++);
- v9fs_add_dir_node(node, parent->attr->mode, "..",
- parent->attr, parent->attr->inode);
- v9fs_add_dir_node(node, node->attr->mode, ".",
- node->attr, node->attr->inode);
- *result = node;
- ret = 0;
-err_out:
- qemu_mutex_unlock(&v9fs_synth_mutex);
- return ret;
-}
-
-int qemu_v9fs_synth_add_file(V9fsSynthNode *parent, int mode,
- const char *name, v9fs_synth_read read,
- v9fs_synth_write write, void *arg)
-{
- int ret;
- V9fsSynthNode *node, *tmp;
-
- if (!v9fs_synth_fs) {
- return EAGAIN;
- }
- if (!name || (strlen(name) >= NAME_MAX)) {
- return EINVAL;
- }
- if (!parent) {
- parent = &v9fs_synth_root;
- }
-
- qemu_mutex_lock(&v9fs_synth_mutex);
- QLIST_FOREACH(tmp, &parent->child, sibling) {
- if (!strcmp(tmp->name, name)) {
- ret = EEXIST;
- goto err_out;
- }
- }
- /* Add file type and remove write bits */
- mode = ((mode & 0777) | S_IFREG);
- node = g_malloc0(sizeof(V9fsSynthNode));
- node->attr = &node->actual_attr;
- node->attr->inode = v9fs_synth_node_count++;
- node->attr->nlink = 1;
- node->attr->read = read;
- node->attr->write = write;
- node->attr->mode = mode;
- node->private = arg;
- pstrcpy(node->name, sizeof(node->name), name);
- QLIST_INSERT_HEAD_RCU(&parent->child, node, sibling);
- ret = 0;
-err_out:
- qemu_mutex_unlock(&v9fs_synth_mutex);
- return ret;
-}
-
-static void v9fs_synth_fill_statbuf(V9fsSynthNode *node, struct stat *stbuf)
-{
- stbuf->st_dev = 0;
- stbuf->st_ino = node->attr->inode;
- stbuf->st_mode = node->attr->mode;
- stbuf->st_nlink = node->attr->nlink;
- stbuf->st_uid = 0;
- stbuf->st_gid = 0;
- stbuf->st_rdev = 0;
- stbuf->st_size = 0;
- stbuf->st_blksize = 0;
- stbuf->st_blocks = 0;
- stbuf->st_atime = 0;
- stbuf->st_mtime = 0;
- stbuf->st_ctime = 0;
-}
-
-static int v9fs_synth_lstat(FsContext *fs_ctx,
- V9fsPath *fs_path, struct stat *stbuf)
-{
- V9fsSynthNode *node = *(V9fsSynthNode **)fs_path->data;
-
- v9fs_synth_fill_statbuf(node, stbuf);
- return 0;
-}
-
-static int v9fs_synth_fstat(FsContext *fs_ctx, int fid_type,
- V9fsFidOpenState *fs, struct stat *stbuf)
-{
- V9fsSynthOpenState *synth_open = fs->private;
- v9fs_synth_fill_statbuf(synth_open->node, stbuf);
- return 0;
-}
-
-static int v9fs_synth_opendir(FsContext *ctx,
- V9fsPath *fs_path, V9fsFidOpenState *fs)
-{
- V9fsSynthOpenState *synth_open;
- V9fsSynthNode *node = *(V9fsSynthNode **)fs_path->data;
-
- synth_open = g_malloc(sizeof(*synth_open));
- synth_open->node = node;
- node->open_count++;
- fs->private = synth_open;
- return 0;
-}
-
-static int v9fs_synth_closedir(FsContext *ctx, V9fsFidOpenState *fs)
-{
- V9fsSynthOpenState *synth_open = fs->private;
- V9fsSynthNode *node = synth_open->node;
-
- node->open_count--;
- g_free(synth_open);
- fs->private = NULL;
- return 0;
-}
-
-static off_t v9fs_synth_telldir(FsContext *ctx, V9fsFidOpenState *fs)
-{
- V9fsSynthOpenState *synth_open = fs->private;
- return synth_open->offset;
-}
-
-static void v9fs_synth_seekdir(FsContext *ctx, V9fsFidOpenState *fs, off_t off)
-{
- V9fsSynthOpenState *synth_open = fs->private;
- synth_open->offset = off;
-}
-
-static void v9fs_synth_rewinddir(FsContext *ctx, V9fsFidOpenState *fs)
-{
- v9fs_synth_seekdir(ctx, fs, 0);
-}
-
-static void v9fs_synth_direntry(V9fsSynthNode *node,
- struct dirent *entry, off_t off)
-{
- strcpy(entry->d_name, node->name);
- entry->d_ino = node->attr->inode;
- entry->d_off = off + 1;
-}
-
-static int v9fs_synth_get_dentry(V9fsSynthNode *dir, struct dirent *entry,
- struct dirent **result, off_t off)
-{
- int i = 0;
- V9fsSynthNode *node;
-
- rcu_read_lock();
- QLIST_FOREACH(node, &dir->child, sibling) {
- /* This is the off child of the directory */
- if (i == off) {
- break;
- }
- i++;
- }
- rcu_read_unlock();
- if (!node) {
- /* end of directory */
- *result = NULL;
- return 0;
- }
- v9fs_synth_direntry(node, entry, off);
- *result = entry;
- return 0;
-}
-
-static int v9fs_synth_readdir_r(FsContext *ctx, V9fsFidOpenState *fs,
- struct dirent *entry, struct dirent **result)
-{
- int ret;
- V9fsSynthOpenState *synth_open = fs->private;
- V9fsSynthNode *node = synth_open->node;
- ret = v9fs_synth_get_dentry(node, entry, result, synth_open->offset);
- if (!ret && *result != NULL) {
- synth_open->offset++;
- }
- return ret;
-}
-
-static int v9fs_synth_open(FsContext *ctx, V9fsPath *fs_path,
- int flags, V9fsFidOpenState *fs)
-{
- V9fsSynthOpenState *synth_open;
- V9fsSynthNode *node = *(V9fsSynthNode **)fs_path->data;
-
- synth_open = g_malloc(sizeof(*synth_open));
- synth_open->node = node;
- node->open_count++;
- fs->private = synth_open;
- return 0;
-}
-
-static int v9fs_synth_open2(FsContext *fs_ctx, V9fsPath *dir_path,
- const char *name, int flags,
- FsCred *credp, V9fsFidOpenState *fs)
-{
- errno = ENOSYS;
- return -1;
-}
-
-static int v9fs_synth_close(FsContext *ctx, V9fsFidOpenState *fs)
-{
- V9fsSynthOpenState *synth_open = fs->private;
- V9fsSynthNode *node = synth_open->node;
-
- node->open_count--;
- g_free(synth_open);
- fs->private = NULL;
- return 0;
-}
-
-static ssize_t v9fs_synth_pwritev(FsContext *ctx, V9fsFidOpenState *fs,
- const struct iovec *iov,
- int iovcnt, off_t offset)
-{
- int i, count = 0, wcount;
- V9fsSynthOpenState *synth_open = fs->private;
- V9fsSynthNode *node = synth_open->node;
- if (!node->attr->write) {
- errno = EPERM;
- return -1;
- }
- for (i = 0; i < iovcnt; i++) {
- wcount = node->attr->write(iov[i].iov_base, iov[i].iov_len,
- offset, node->private);
- offset += wcount;
- count += wcount;
- /* If we wrote less than requested. we are done */
- if (wcount < iov[i].iov_len) {
- break;
- }
- }
- return count;
-}
-
-static ssize_t v9fs_synth_preadv(FsContext *ctx, V9fsFidOpenState *fs,
- const struct iovec *iov,
- int iovcnt, off_t offset)
-{
- int i, count = 0, rcount;
- V9fsSynthOpenState *synth_open = fs->private;
- V9fsSynthNode *node = synth_open->node;
- if (!node->attr->read) {
- errno = EPERM;
- return -1;
- }
- for (i = 0; i < iovcnt; i++) {
- rcount = node->attr->read(iov[i].iov_base, iov[i].iov_len,
- offset, node->private);
- offset += rcount;
- count += rcount;
- /* If we read less than requested. we are done */
- if (rcount < iov[i].iov_len) {
- break;
- }
- }
- return count;
-}
-
-static int v9fs_synth_truncate(FsContext *ctx, V9fsPath *path, off_t offset)
-{
- errno = ENOSYS;
- return -1;
-}
-
-static int v9fs_synth_chmod(FsContext *fs_ctx, V9fsPath *path, FsCred *credp)
-{
- errno = EPERM;
- return -1;
-}
-
-static int v9fs_synth_mknod(FsContext *fs_ctx, V9fsPath *path,
- const char *buf, FsCred *credp)
-{
- errno = EPERM;
- return -1;
-}
-
-static int v9fs_synth_mkdir(FsContext *fs_ctx, V9fsPath *path,
- const char *buf, FsCred *credp)
-{
- errno = EPERM;
- return -1;
-}
-
-static ssize_t v9fs_synth_readlink(FsContext *fs_ctx, V9fsPath *path,
- char *buf, size_t bufsz)
-{
- errno = ENOSYS;
- return -1;
-}
-
-static int v9fs_synth_symlink(FsContext *fs_ctx, const char *oldpath,
- V9fsPath *newpath, const char *buf, FsCred *credp)
-{
- errno = EPERM;
- return -1;
-}
-
-static int v9fs_synth_link(FsContext *fs_ctx, V9fsPath *oldpath,
- V9fsPath *newpath, const char *buf)
-{
- errno = EPERM;
- return -1;
-}
-
-static int v9fs_synth_rename(FsContext *ctx, const char *oldpath,
- const char *newpath)
-{
- errno = EPERM;
- return -1;
-}
-
-static int v9fs_synth_chown(FsContext *fs_ctx, V9fsPath *path, FsCred *credp)
-{
- errno = EPERM;
- return -1;
-}
-
-static int v9fs_synth_utimensat(FsContext *fs_ctx, V9fsPath *path,
- const struct timespec *buf)
-{
- errno = EPERM;
- return 0;
-}
-
-static int v9fs_synth_remove(FsContext *ctx, const char *path)
-{
- errno = EPERM;
- return -1;
-}
-
-static int v9fs_synth_fsync(FsContext *ctx, int fid_type,
- V9fsFidOpenState *fs, int datasync)
-{
- errno = ENOSYS;
- return 0;
-}
-
-static int v9fs_synth_statfs(FsContext *s, V9fsPath *fs_path,
- struct statfs *stbuf)
-{
- stbuf->f_type = 0xABCD;
- stbuf->f_bsize = 512;
- stbuf->f_blocks = 0;
- stbuf->f_files = v9fs_synth_node_count;
- stbuf->f_namelen = NAME_MAX;
- return 0;
-}
-
-static ssize_t v9fs_synth_lgetxattr(FsContext *ctx, V9fsPath *path,
- const char *name, void *value, size_t size)
-{
- errno = ENOTSUP;
- return -1;
-}
-
-static ssize_t v9fs_synth_llistxattr(FsContext *ctx, V9fsPath *path,
- void *value, size_t size)
-{
- errno = ENOTSUP;
- return -1;
-}
-
-static int v9fs_synth_lsetxattr(FsContext *ctx, V9fsPath *path,
- const char *name, void *value,
- size_t size, int flags)
-{
- errno = ENOTSUP;
- return -1;
-}
-
-static int v9fs_synth_lremovexattr(FsContext *ctx,
- V9fsPath *path, const char *name)
-{
- errno = ENOTSUP;
- return -1;
-}
-
-static int v9fs_synth_name_to_path(FsContext *ctx, V9fsPath *dir_path,
- const char *name, V9fsPath *target)
-{
- V9fsSynthNode *node;
- V9fsSynthNode *dir_node;
-
- /* "." and ".." are not allowed */
- if (!strcmp(name, ".") || !strcmp(name, "..")) {
- errno = EINVAL;
- return -1;
-
- }
- if (!dir_path) {
- dir_node = &v9fs_synth_root;
- } else {
- dir_node = *(V9fsSynthNode **)dir_path->data;
- }
- if (!strcmp(name, "/")) {
- node = dir_node;
- goto out;
- }
- /* search for the name in the childern */
- rcu_read_lock();
- QLIST_FOREACH(node, &dir_node->child, sibling) {
- if (!strcmp(node->name, name)) {
- break;
- }
- }
- rcu_read_unlock();
-
- if (!node) {
- errno = ENOENT;
- return -1;
- }
-out:
- /* Copy the node pointer to fid */
- target->data = g_malloc(sizeof(void *));
- memcpy(target->data, &node, sizeof(void *));
- target->size = sizeof(void *);
- return 0;
-}
-
-static int v9fs_synth_renameat(FsContext *ctx, V9fsPath *olddir,
- const char *old_name, V9fsPath *newdir,
- const char *new_name)
-{
- errno = EPERM;
- return -1;
-}
-
-static int v9fs_synth_unlinkat(FsContext *ctx, V9fsPath *dir,
- const char *name, int flags)
-{
- errno = EPERM;
- return -1;
-}
-
-static int v9fs_synth_init(FsContext *ctx)
-{
- QLIST_INIT(&v9fs_synth_root.child);
- qemu_mutex_init(&v9fs_synth_mutex);
-
- /* Add "." and ".." entries for root */
- v9fs_add_dir_node(&v9fs_synth_root, v9fs_synth_root.attr->mode,
- "..", v9fs_synth_root.attr, v9fs_synth_root.attr->inode);
- v9fs_add_dir_node(&v9fs_synth_root, v9fs_synth_root.attr->mode,
- ".", v9fs_synth_root.attr, v9fs_synth_root.attr->inode);
-
- /* Mark the subsystem is ready for use */
- v9fs_synth_fs = 1;
- return 0;
-}
-
-FileOperations synth_ops = {
- .init = v9fs_synth_init,
- .lstat = v9fs_synth_lstat,
- .readlink = v9fs_synth_readlink,
- .close = v9fs_synth_close,
- .closedir = v9fs_synth_closedir,
- .open = v9fs_synth_open,
- .opendir = v9fs_synth_opendir,
- .rewinddir = v9fs_synth_rewinddir,
- .telldir = v9fs_synth_telldir,
- .readdir_r = v9fs_synth_readdir_r,
- .seekdir = v9fs_synth_seekdir,
- .preadv = v9fs_synth_preadv,
- .pwritev = v9fs_synth_pwritev,
- .chmod = v9fs_synth_chmod,
- .mknod = v9fs_synth_mknod,
- .mkdir = v9fs_synth_mkdir,
- .fstat = v9fs_synth_fstat,
- .open2 = v9fs_synth_open2,
- .symlink = v9fs_synth_symlink,
- .link = v9fs_synth_link,
- .truncate = v9fs_synth_truncate,
- .rename = v9fs_synth_rename,
- .chown = v9fs_synth_chown,
- .utimensat = v9fs_synth_utimensat,
- .remove = v9fs_synth_remove,
- .fsync = v9fs_synth_fsync,
- .statfs = v9fs_synth_statfs,
- .lgetxattr = v9fs_synth_lgetxattr,
- .llistxattr = v9fs_synth_llistxattr,
- .lsetxattr = v9fs_synth_lsetxattr,
- .lremovexattr = v9fs_synth_lremovexattr,
- .name_to_path = v9fs_synth_name_to_path,
- .renameat = v9fs_synth_renameat,
- .unlinkat = v9fs_synth_unlinkat,
-};
Code Review / kvmfornfv.git / blobdiff