root / hw / 9pfs / virtio-9p-local.c @ cc720ddb
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/*
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* Virtio 9p Posix callback
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*
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* Copyright IBM, Corp. 2010
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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*/
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#include "hw/virtio.h" |
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#include "virtio-9p.h" |
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#include "virtio-9p-xattr.h" |
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#include <arpa/inet.h> |
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#include <pwd.h> |
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#include <grp.h> |
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#include <sys/socket.h> |
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#include <sys/un.h> |
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#include <attr/xattr.h> |
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#include <linux/fs.h> |
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#ifdef CONFIG_LINUX_MAGIC_H
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#include <linux/magic.h> |
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#endif
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#include <sys/ioctl.h> |
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|
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#ifndef XFS_SUPER_MAGIC
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#define XFS_SUPER_MAGIC 0x58465342 |
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#endif
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#ifndef EXT2_SUPER_MAGIC
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#define EXT2_SUPER_MAGIC 0xEF53 |
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#endif
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#ifndef REISERFS_SUPER_MAGIC
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#define REISERFS_SUPER_MAGIC 0x52654973 |
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#endif
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#ifndef BTRFS_SUPER_MAGIC
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#define BTRFS_SUPER_MAGIC 0x9123683E |
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#endif
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|
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static int local_lstat(FsContext *fs_ctx, V9fsPath *fs_path, struct stat *stbuf) |
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{
|
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int err;
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char buffer[PATH_MAX];
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char *path = fs_path->data;
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|
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err = lstat(rpath(fs_ctx, path, buffer), stbuf); |
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if (err) {
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return err;
|
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} |
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if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
|
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/* Actual credentials are part of extended attrs */
|
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uid_t tmp_uid; |
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gid_t tmp_gid; |
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mode_t tmp_mode; |
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dev_t tmp_dev; |
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if (getxattr(rpath(fs_ctx, path, buffer), "user.virtfs.uid", &tmp_uid, |
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sizeof(uid_t)) > 0) { |
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stbuf->st_uid = tmp_uid; |
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} |
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if (getxattr(rpath(fs_ctx, path, buffer), "user.virtfs.gid", &tmp_gid, |
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sizeof(gid_t)) > 0) { |
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stbuf->st_gid = tmp_gid; |
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} |
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if (getxattr(rpath(fs_ctx, path, buffer), "user.virtfs.mode", |
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&tmp_mode, sizeof(mode_t)) > 0) { |
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stbuf->st_mode = tmp_mode; |
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} |
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if (getxattr(rpath(fs_ctx, path, buffer), "user.virtfs.rdev", &tmp_dev, |
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sizeof(dev_t)) > 0) { |
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stbuf->st_rdev = tmp_dev; |
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} |
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} |
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return err;
|
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} |
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|
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static int local_set_xattr(const char *path, FsCred *credp) |
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{
|
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int err;
|
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|
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if (credp->fc_uid != -1) { |
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err = setxattr(path, "user.virtfs.uid", &credp->fc_uid, sizeof(uid_t), |
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0);
|
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if (err) {
|
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return err;
|
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} |
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} |
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if (credp->fc_gid != -1) { |
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err = setxattr(path, "user.virtfs.gid", &credp->fc_gid, sizeof(gid_t), |
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0);
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if (err) {
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return err;
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} |
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} |
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if (credp->fc_mode != -1) { |
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err = setxattr(path, "user.virtfs.mode", &credp->fc_mode,
|
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sizeof(mode_t), 0); |
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if (err) {
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return err;
|
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} |
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} |
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if (credp->fc_rdev != -1) { |
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err = setxattr(path, "user.virtfs.rdev", &credp->fc_rdev,
|
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sizeof(dev_t), 0); |
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if (err) {
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return err;
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} |
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} |
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return 0; |
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} |
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|
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static int local_post_create_passthrough(FsContext *fs_ctx, const char *path, |
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FsCred *credp) |
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{
|
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char buffer[PATH_MAX];
|
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|
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if (chmod(rpath(fs_ctx, path, buffer), credp->fc_mode & 07777) < 0) { |
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return -1; |
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} |
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if (lchown(rpath(fs_ctx, path, buffer), credp->fc_uid,
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credp->fc_gid) < 0) {
|
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/*
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* If we fail to change ownership and if we are
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* using security model none. Ignore the error
|
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*/
|
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if ((fs_ctx->export_flags & V9FS_SEC_MASK) != V9FS_SM_NONE) {
|
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return -1; |
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} |
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} |
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return 0; |
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} |
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|
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static ssize_t local_readlink(FsContext *fs_ctx, V9fsPath *fs_path,
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char *buf, size_t bufsz)
|
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{
|
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ssize_t tsize = -1;
|
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char buffer[PATH_MAX];
|
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char *path = fs_path->data;
|
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|
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if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
|
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int fd;
|
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fd = open(rpath(fs_ctx, path, buffer), O_RDONLY); |
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if (fd == -1) { |
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return -1; |
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} |
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do {
|
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tsize = read(fd, (void *)buf, bufsz);
|
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} while (tsize == -1 && errno == EINTR); |
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close(fd); |
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return tsize;
|
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} else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) || |
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(fs_ctx->export_flags & V9FS_SM_NONE)) {
|
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tsize = readlink(rpath(fs_ctx, path, buffer), buf, bufsz); |
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} |
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return tsize;
|
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} |
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|
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static int local_close(FsContext *ctx, V9fsFidOpenState *fs) |
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{
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return close(fs->fd);
|
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} |
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|
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static int local_closedir(FsContext *ctx, V9fsFidOpenState *fs) |
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{
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return closedir(fs->dir);
|
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} |
| 168 |
|
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static int local_open(FsContext *ctx, V9fsPath *fs_path, |
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int flags, V9fsFidOpenState *fs)
|
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{
|
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char buffer[PATH_MAX];
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char *path = fs_path->data;
|
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|
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fs->fd = open(rpath(ctx, path, buffer), flags); |
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return fs->fd;
|
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} |
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|
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static int local_opendir(FsContext *ctx, |
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V9fsPath *fs_path, V9fsFidOpenState *fs) |
| 181 |
{
|
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char buffer[PATH_MAX];
|
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char *path = fs_path->data;
|
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|
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fs->dir = opendir(rpath(ctx, path, buffer)); |
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if (!fs->dir) {
|
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return -1; |
| 188 |
} |
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return 0; |
| 190 |
} |
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|
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static void local_rewinddir(FsContext *ctx, V9fsFidOpenState *fs) |
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{
|
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return rewinddir(fs->dir);
|
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} |
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|
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static off_t local_telldir(FsContext *ctx, V9fsFidOpenState *fs)
|
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{
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return telldir(fs->dir);
|
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} |
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|
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static int local_readdir_r(FsContext *ctx, V9fsFidOpenState *fs, |
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struct dirent *entry,
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struct dirent **result)
|
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{
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return readdir_r(fs->dir, entry, result);
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} |
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|
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static void local_seekdir(FsContext *ctx, V9fsFidOpenState *fs, off_t off) |
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{
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return seekdir(fs->dir, off);
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} |
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|
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static ssize_t local_preadv(FsContext *ctx, V9fsFidOpenState *fs,
|
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const struct iovec *iov, |
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int iovcnt, off_t offset)
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{
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#ifdef CONFIG_PREADV
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return preadv(fs->fd, iov, iovcnt, offset);
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#else
|
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int err = lseek(fs->fd, offset, SEEK_SET);
|
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if (err == -1) { |
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return err;
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} else {
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return readv(fs->fd, iov, iovcnt);
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} |
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#endif
|
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} |
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|
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static ssize_t local_pwritev(FsContext *ctx, V9fsFidOpenState *fs,
|
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const struct iovec *iov, |
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int iovcnt, off_t offset)
|
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{
|
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ssize_t ret |
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; |
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#ifdef CONFIG_PREADV
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ret = pwritev(fs->fd, iov, iovcnt, offset); |
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#else
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int err = lseek(fs->fd, offset, SEEK_SET);
|
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if (err == -1) { |
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return err;
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} else {
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ret = writev(fs->fd, iov, iovcnt); |
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} |
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#endif
|
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#ifdef CONFIG_SYNC_FILE_RANGE
|
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if (ret > 0 && ctx->export_flags & V9FS_IMMEDIATE_WRITEOUT) { |
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/*
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* Initiate a writeback. This is not a data integrity sync.
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* We want to ensure that we don't leave dirty pages in the cache
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* after write when writeout=immediate is sepcified.
|
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*/
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sync_file_range(fs->fd, offset, ret, |
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SYNC_FILE_RANGE_WAIT_BEFORE | SYNC_FILE_RANGE_WRITE); |
| 255 |
} |
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#endif
|
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return ret;
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} |
| 259 |
|
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static int local_chmod(FsContext *fs_ctx, V9fsPath *fs_path, FsCred *credp) |
| 261 |
{
|
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char buffer[PATH_MAX];
|
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char *path = fs_path->data;
|
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|
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if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
|
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return local_set_xattr(rpath(fs_ctx, path, buffer), credp);
|
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} else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) || |
| 268 |
(fs_ctx->export_flags & V9FS_SM_NONE)) {
|
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return chmod(rpath(fs_ctx, path, buffer), credp->fc_mode);
|
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} |
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return -1; |
| 272 |
} |
| 273 |
|
| 274 |
static int local_mknod(FsContext *fs_ctx, V9fsPath *dir_path, |
| 275 |
const char *name, FsCred *credp) |
| 276 |
{
|
| 277 |
char *path;
|
| 278 |
int err = -1; |
| 279 |
int serrno = 0; |
| 280 |
V9fsString fullname; |
| 281 |
char buffer[PATH_MAX];
|
| 282 |
|
| 283 |
v9fs_string_init(&fullname); |
| 284 |
v9fs_string_sprintf(&fullname, "%s/%s", dir_path->data, name);
|
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path = fullname.data; |
| 286 |
|
| 287 |
/* Determine the security model */
|
| 288 |
if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
|
| 289 |
err = mknod(rpath(fs_ctx, path, buffer), |
| 290 |
SM_LOCAL_MODE_BITS|S_IFREG, 0);
|
| 291 |
if (err == -1) { |
| 292 |
goto out;
|
| 293 |
} |
| 294 |
err = local_set_xattr(rpath(fs_ctx, path, buffer), credp); |
| 295 |
if (err == -1) { |
| 296 |
serrno = errno; |
| 297 |
goto err_end;
|
| 298 |
} |
| 299 |
} else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) || |
| 300 |
(fs_ctx->export_flags & V9FS_SM_NONE)) {
|
| 301 |
err = mknod(rpath(fs_ctx, path, buffer), credp->fc_mode, |
| 302 |
credp->fc_rdev); |
| 303 |
if (err == -1) { |
| 304 |
goto out;
|
| 305 |
} |
| 306 |
err = local_post_create_passthrough(fs_ctx, path, credp); |
| 307 |
if (err == -1) { |
| 308 |
serrno = errno; |
| 309 |
goto err_end;
|
| 310 |
} |
| 311 |
} |
| 312 |
goto out;
|
| 313 |
|
| 314 |
err_end:
|
| 315 |
remove(rpath(fs_ctx, path, buffer)); |
| 316 |
errno = serrno; |
| 317 |
out:
|
| 318 |
v9fs_string_free(&fullname); |
| 319 |
return err;
|
| 320 |
} |
| 321 |
|
| 322 |
static int local_mkdir(FsContext *fs_ctx, V9fsPath *dir_path, |
| 323 |
const char *name, FsCred *credp) |
| 324 |
{
|
| 325 |
char *path;
|
| 326 |
int err = -1; |
| 327 |
int serrno = 0; |
| 328 |
V9fsString fullname; |
| 329 |
char buffer[PATH_MAX];
|
| 330 |
|
| 331 |
v9fs_string_init(&fullname); |
| 332 |
v9fs_string_sprintf(&fullname, "%s/%s", dir_path->data, name);
|
| 333 |
path = fullname.data; |
| 334 |
|
| 335 |
/* Determine the security model */
|
| 336 |
if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
|
| 337 |
err = mkdir(rpath(fs_ctx, path, buffer), SM_LOCAL_DIR_MODE_BITS); |
| 338 |
if (err == -1) { |
| 339 |
goto out;
|
| 340 |
} |
| 341 |
credp->fc_mode = credp->fc_mode|S_IFDIR; |
| 342 |
err = local_set_xattr(rpath(fs_ctx, path, buffer), credp); |
| 343 |
if (err == -1) { |
| 344 |
serrno = errno; |
| 345 |
goto err_end;
|
| 346 |
} |
| 347 |
} else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) || |
| 348 |
(fs_ctx->export_flags & V9FS_SM_NONE)) {
|
| 349 |
err = mkdir(rpath(fs_ctx, path, buffer), credp->fc_mode); |
| 350 |
if (err == -1) { |
| 351 |
goto out;
|
| 352 |
} |
| 353 |
err = local_post_create_passthrough(fs_ctx, path, credp); |
| 354 |
if (err == -1) { |
| 355 |
serrno = errno; |
| 356 |
goto err_end;
|
| 357 |
} |
| 358 |
} |
| 359 |
goto out;
|
| 360 |
|
| 361 |
err_end:
|
| 362 |
remove(rpath(fs_ctx, path, buffer)); |
| 363 |
errno = serrno; |
| 364 |
out:
|
| 365 |
v9fs_string_free(&fullname); |
| 366 |
return err;
|
| 367 |
} |
| 368 |
|
| 369 |
static int local_fstat(FsContext *fs_ctx, |
| 370 |
V9fsFidOpenState *fs, struct stat *stbuf)
|
| 371 |
{
|
| 372 |
int err;
|
| 373 |
err = fstat(fs->fd, stbuf); |
| 374 |
if (err) {
|
| 375 |
return err;
|
| 376 |
} |
| 377 |
if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
|
| 378 |
/* Actual credentials are part of extended attrs */
|
| 379 |
uid_t tmp_uid; |
| 380 |
gid_t tmp_gid; |
| 381 |
mode_t tmp_mode; |
| 382 |
dev_t tmp_dev; |
| 383 |
|
| 384 |
if (fgetxattr(fs->fd, "user.virtfs.uid", |
| 385 |
&tmp_uid, sizeof(uid_t)) > 0) { |
| 386 |
stbuf->st_uid = tmp_uid; |
| 387 |
} |
| 388 |
if (fgetxattr(fs->fd, "user.virtfs.gid", |
| 389 |
&tmp_gid, sizeof(gid_t)) > 0) { |
| 390 |
stbuf->st_gid = tmp_gid; |
| 391 |
} |
| 392 |
if (fgetxattr(fs->fd, "user.virtfs.mode", |
| 393 |
&tmp_mode, sizeof(mode_t)) > 0) { |
| 394 |
stbuf->st_mode = tmp_mode; |
| 395 |
} |
| 396 |
if (fgetxattr(fs->fd, "user.virtfs.rdev", |
| 397 |
&tmp_dev, sizeof(dev_t)) > 0) { |
| 398 |
stbuf->st_rdev = tmp_dev; |
| 399 |
} |
| 400 |
} |
| 401 |
return err;
|
| 402 |
} |
| 403 |
|
| 404 |
static int local_open2(FsContext *fs_ctx, V9fsPath *dir_path, const char *name, |
| 405 |
int flags, FsCred *credp, V9fsFidOpenState *fs)
|
| 406 |
{
|
| 407 |
char *path;
|
| 408 |
int fd = -1; |
| 409 |
int err = -1; |
| 410 |
int serrno = 0; |
| 411 |
V9fsString fullname; |
| 412 |
char buffer[PATH_MAX];
|
| 413 |
|
| 414 |
v9fs_string_init(&fullname); |
| 415 |
v9fs_string_sprintf(&fullname, "%s/%s", dir_path->data, name);
|
| 416 |
path = fullname.data; |
| 417 |
|
| 418 |
/* Determine the security model */
|
| 419 |
if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
|
| 420 |
fd = open(rpath(fs_ctx, path, buffer), flags, SM_LOCAL_MODE_BITS); |
| 421 |
if (fd == -1) { |
| 422 |
err = fd; |
| 423 |
goto out;
|
| 424 |
} |
| 425 |
credp->fc_mode = credp->fc_mode|S_IFREG; |
| 426 |
/* Set cleint credentials in xattr */
|
| 427 |
err = local_set_xattr(rpath(fs_ctx, path, buffer), credp); |
| 428 |
if (err == -1) { |
| 429 |
serrno = errno; |
| 430 |
goto err_end;
|
| 431 |
} |
| 432 |
} else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) || |
| 433 |
(fs_ctx->export_flags & V9FS_SM_NONE)) {
|
| 434 |
fd = open(rpath(fs_ctx, path, buffer), flags, credp->fc_mode); |
| 435 |
if (fd == -1) { |
| 436 |
err = fd; |
| 437 |
goto out;
|
| 438 |
} |
| 439 |
err = local_post_create_passthrough(fs_ctx, path, credp); |
| 440 |
if (err == -1) { |
| 441 |
serrno = errno; |
| 442 |
goto err_end;
|
| 443 |
} |
| 444 |
} |
| 445 |
err = fd; |
| 446 |
fs->fd = fd; |
| 447 |
goto out;
|
| 448 |
|
| 449 |
err_end:
|
| 450 |
close(fd); |
| 451 |
remove(rpath(fs_ctx, path, buffer)); |
| 452 |
errno = serrno; |
| 453 |
out:
|
| 454 |
v9fs_string_free(&fullname); |
| 455 |
return err;
|
| 456 |
} |
| 457 |
|
| 458 |
|
| 459 |
static int local_symlink(FsContext *fs_ctx, const char *oldpath, |
| 460 |
V9fsPath *dir_path, const char *name, FsCred *credp) |
| 461 |
{
|
| 462 |
int err = -1; |
| 463 |
int serrno = 0; |
| 464 |
char *newpath;
|
| 465 |
V9fsString fullname; |
| 466 |
char buffer[PATH_MAX];
|
| 467 |
|
| 468 |
v9fs_string_init(&fullname); |
| 469 |
v9fs_string_sprintf(&fullname, "%s/%s", dir_path->data, name);
|
| 470 |
newpath = fullname.data; |
| 471 |
|
| 472 |
/* Determine the security model */
|
| 473 |
if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
|
| 474 |
int fd;
|
| 475 |
ssize_t oldpath_size, write_size; |
| 476 |
fd = open(rpath(fs_ctx, newpath, buffer), O_CREAT|O_EXCL|O_RDWR, |
| 477 |
SM_LOCAL_MODE_BITS); |
| 478 |
if (fd == -1) { |
| 479 |
err = fd; |
| 480 |
goto out;
|
| 481 |
} |
| 482 |
/* Write the oldpath (target) to the file. */
|
| 483 |
oldpath_size = strlen(oldpath); |
| 484 |
do {
|
| 485 |
write_size = write(fd, (void *)oldpath, oldpath_size);
|
| 486 |
} while (write_size == -1 && errno == EINTR); |
| 487 |
|
| 488 |
if (write_size != oldpath_size) {
|
| 489 |
serrno = errno; |
| 490 |
close(fd); |
| 491 |
err = -1;
|
| 492 |
goto err_end;
|
| 493 |
} |
| 494 |
close(fd); |
| 495 |
/* Set cleint credentials in symlink's xattr */
|
| 496 |
credp->fc_mode = credp->fc_mode|S_IFLNK; |
| 497 |
err = local_set_xattr(rpath(fs_ctx, newpath, buffer), credp); |
| 498 |
if (err == -1) { |
| 499 |
serrno = errno; |
| 500 |
goto err_end;
|
| 501 |
} |
| 502 |
} else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) || |
| 503 |
(fs_ctx->export_flags & V9FS_SM_NONE)) {
|
| 504 |
err = symlink(oldpath, rpath(fs_ctx, newpath, buffer)); |
| 505 |
if (err) {
|
| 506 |
goto out;
|
| 507 |
} |
| 508 |
err = lchown(rpath(fs_ctx, newpath, buffer), credp->fc_uid, |
| 509 |
credp->fc_gid); |
| 510 |
if (err == -1) { |
| 511 |
/*
|
| 512 |
* If we fail to change ownership and if we are
|
| 513 |
* using security model none. Ignore the error
|
| 514 |
*/
|
| 515 |
if ((fs_ctx->export_flags & V9FS_SEC_MASK) != V9FS_SM_NONE) {
|
| 516 |
serrno = errno; |
| 517 |
goto err_end;
|
| 518 |
} else
|
| 519 |
err = 0;
|
| 520 |
} |
| 521 |
} |
| 522 |
goto out;
|
| 523 |
|
| 524 |
err_end:
|
| 525 |
remove(rpath(fs_ctx, newpath, buffer)); |
| 526 |
errno = serrno; |
| 527 |
out:
|
| 528 |
v9fs_string_free(&fullname); |
| 529 |
return err;
|
| 530 |
} |
| 531 |
|
| 532 |
static int local_link(FsContext *ctx, V9fsPath *oldpath, |
| 533 |
V9fsPath *dirpath, const char *name) |
| 534 |
{
|
| 535 |
int ret;
|
| 536 |
V9fsString newpath; |
| 537 |
char buffer[PATH_MAX], buffer1[PATH_MAX];
|
| 538 |
|
| 539 |
v9fs_string_init(&newpath); |
| 540 |
v9fs_string_sprintf(&newpath, "%s/%s", dirpath->data, name);
|
| 541 |
|
| 542 |
ret = link(rpath(ctx, oldpath->data, buffer), |
| 543 |
rpath(ctx, newpath.data, buffer1)); |
| 544 |
v9fs_string_free(&newpath); |
| 545 |
return ret;
|
| 546 |
} |
| 547 |
|
| 548 |
static int local_truncate(FsContext *ctx, V9fsPath *fs_path, off_t size) |
| 549 |
{
|
| 550 |
char buffer[PATH_MAX];
|
| 551 |
char *path = fs_path->data;
|
| 552 |
|
| 553 |
return truncate(rpath(ctx, path, buffer), size);
|
| 554 |
} |
| 555 |
|
| 556 |
static int local_rename(FsContext *ctx, const char *oldpath, |
| 557 |
const char *newpath) |
| 558 |
{
|
| 559 |
char buffer[PATH_MAX], buffer1[PATH_MAX];
|
| 560 |
|
| 561 |
return rename(rpath(ctx, oldpath, buffer), rpath(ctx, newpath, buffer1));
|
| 562 |
} |
| 563 |
|
| 564 |
static int local_chown(FsContext *fs_ctx, V9fsPath *fs_path, FsCred *credp) |
| 565 |
{
|
| 566 |
char buffer[PATH_MAX];
|
| 567 |
char *path = fs_path->data;
|
| 568 |
|
| 569 |
if ((credp->fc_uid == -1 && credp->fc_gid == -1) || |
| 570 |
(fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) || |
| 571 |
(fs_ctx->export_flags & V9FS_SM_NONE)) {
|
| 572 |
return lchown(rpath(fs_ctx, path, buffer),
|
| 573 |
credp->fc_uid, credp->fc_gid); |
| 574 |
} else if (fs_ctx->export_flags & V9FS_SM_MAPPED) { |
| 575 |
return local_set_xattr(rpath(fs_ctx, path, buffer), credp);
|
| 576 |
} |
| 577 |
return -1; |
| 578 |
} |
| 579 |
|
| 580 |
static int local_utimensat(FsContext *s, V9fsPath *fs_path, |
| 581 |
const struct timespec *buf) |
| 582 |
{
|
| 583 |
char buffer[PATH_MAX];
|
| 584 |
char *path = fs_path->data;
|
| 585 |
|
| 586 |
return qemu_utimensat(AT_FDCWD, rpath(s, path, buffer), buf,
|
| 587 |
AT_SYMLINK_NOFOLLOW); |
| 588 |
} |
| 589 |
|
| 590 |
static int local_remove(FsContext *ctx, const char *path) |
| 591 |
{
|
| 592 |
char buffer[PATH_MAX];
|
| 593 |
return remove(rpath(ctx, path, buffer));
|
| 594 |
} |
| 595 |
|
| 596 |
static int local_fsync(FsContext *ctx, V9fsFidOpenState *fs, int datasync) |
| 597 |
{
|
| 598 |
if (datasync) {
|
| 599 |
return qemu_fdatasync(fs->fd);
|
| 600 |
} else {
|
| 601 |
return fsync(fs->fd);
|
| 602 |
} |
| 603 |
} |
| 604 |
|
| 605 |
static int local_statfs(FsContext *s, V9fsPath *fs_path, struct statfs *stbuf) |
| 606 |
{
|
| 607 |
char buffer[PATH_MAX];
|
| 608 |
char *path = fs_path->data;
|
| 609 |
|
| 610 |
return statfs(rpath(s, path, buffer), stbuf);
|
| 611 |
} |
| 612 |
|
| 613 |
static ssize_t local_lgetxattr(FsContext *ctx, V9fsPath *fs_path,
|
| 614 |
const char *name, void *value, size_t size) |
| 615 |
{
|
| 616 |
char *path = fs_path->data;
|
| 617 |
|
| 618 |
return v9fs_get_xattr(ctx, path, name, value, size);
|
| 619 |
} |
| 620 |
|
| 621 |
static ssize_t local_llistxattr(FsContext *ctx, V9fsPath *fs_path,
|
| 622 |
void *value, size_t size)
|
| 623 |
{
|
| 624 |
char *path = fs_path->data;
|
| 625 |
|
| 626 |
return v9fs_list_xattr(ctx, path, value, size);
|
| 627 |
} |
| 628 |
|
| 629 |
static int local_lsetxattr(FsContext *ctx, V9fsPath *fs_path, const char *name, |
| 630 |
void *value, size_t size, int flags) |
| 631 |
{
|
| 632 |
char *path = fs_path->data;
|
| 633 |
|
| 634 |
return v9fs_set_xattr(ctx, path, name, value, size, flags);
|
| 635 |
} |
| 636 |
|
| 637 |
static int local_lremovexattr(FsContext *ctx, V9fsPath *fs_path, |
| 638 |
const char *name) |
| 639 |
{
|
| 640 |
char *path = fs_path->data;
|
| 641 |
|
| 642 |
return v9fs_remove_xattr(ctx, path, name);
|
| 643 |
} |
| 644 |
|
| 645 |
static int local_name_to_path(FsContext *ctx, V9fsPath *dir_path, |
| 646 |
const char *name, V9fsPath *target) |
| 647 |
{
|
| 648 |
if (dir_path) {
|
| 649 |
v9fs_string_sprintf((V9fsString *)target, "%s/%s",
|
| 650 |
dir_path->data, name); |
| 651 |
} else {
|
| 652 |
v9fs_string_sprintf((V9fsString *)target, "%s", name);
|
| 653 |
} |
| 654 |
/* Bump the size for including terminating NULL */
|
| 655 |
target->size++; |
| 656 |
return 0; |
| 657 |
} |
| 658 |
|
| 659 |
static int local_renameat(FsContext *ctx, V9fsPath *olddir, |
| 660 |
const char *old_name, V9fsPath *newdir, |
| 661 |
const char *new_name) |
| 662 |
{
|
| 663 |
int ret;
|
| 664 |
V9fsString old_full_name, new_full_name; |
| 665 |
|
| 666 |
v9fs_string_init(&old_full_name); |
| 667 |
v9fs_string_init(&new_full_name); |
| 668 |
|
| 669 |
v9fs_string_sprintf(&old_full_name, "%s/%s", olddir->data, old_name);
|
| 670 |
v9fs_string_sprintf(&new_full_name, "%s/%s", newdir->data, new_name);
|
| 671 |
|
| 672 |
ret = local_rename(ctx, old_full_name.data, new_full_name.data); |
| 673 |
v9fs_string_free(&old_full_name); |
| 674 |
v9fs_string_free(&new_full_name); |
| 675 |
return ret;
|
| 676 |
} |
| 677 |
|
| 678 |
static int local_unlinkat(FsContext *ctx, V9fsPath *dir, |
| 679 |
const char *name, int flags) |
| 680 |
{
|
| 681 |
int ret;
|
| 682 |
V9fsString fullname; |
| 683 |
char buffer[PATH_MAX];
|
| 684 |
v9fs_string_init(&fullname); |
| 685 |
|
| 686 |
v9fs_string_sprintf(&fullname, "%s/%s", dir->data, name);
|
| 687 |
ret = remove(rpath(ctx, fullname.data, buffer)); |
| 688 |
v9fs_string_free(&fullname); |
| 689 |
|
| 690 |
return ret;
|
| 691 |
} |
| 692 |
|
| 693 |
static int local_ioc_getversion(FsContext *ctx, V9fsPath *path, |
| 694 |
mode_t st_mode, uint64_t *st_gen) |
| 695 |
{
|
| 696 |
int err;
|
| 697 |
V9fsFidOpenState fid_open; |
| 698 |
|
| 699 |
/*
|
| 700 |
* Do not try to open special files like device nodes, fifos etc
|
| 701 |
* We can get fd for regular files and directories only
|
| 702 |
*/
|
| 703 |
if (!S_ISREG(st_mode) && !S_ISDIR(st_mode)) {
|
| 704 |
return 0; |
| 705 |
} |
| 706 |
err = local_open(ctx, path, O_RDONLY, &fid_open); |
| 707 |
if (err < 0) { |
| 708 |
return err;
|
| 709 |
} |
| 710 |
err = ioctl(fid_open.fd, FS_IOC_GETVERSION, st_gen); |
| 711 |
local_close(ctx, &fid_open); |
| 712 |
return err;
|
| 713 |
} |
| 714 |
|
| 715 |
static int local_init(FsContext *ctx) |
| 716 |
{
|
| 717 |
int err;
|
| 718 |
struct statfs stbuf;
|
| 719 |
|
| 720 |
ctx->export_flags |= V9FS_PATHNAME_FSCONTEXT; |
| 721 |
err = statfs(ctx->fs_root, &stbuf); |
| 722 |
if (!err) {
|
| 723 |
switch (stbuf.f_type) {
|
| 724 |
case EXT2_SUPER_MAGIC:
|
| 725 |
case BTRFS_SUPER_MAGIC:
|
| 726 |
case REISERFS_SUPER_MAGIC:
|
| 727 |
case XFS_SUPER_MAGIC:
|
| 728 |
ctx->exops.get_st_gen = local_ioc_getversion; |
| 729 |
break;
|
| 730 |
} |
| 731 |
} |
| 732 |
return err;
|
| 733 |
} |
| 734 |
|
| 735 |
FileOperations local_ops = {
|
| 736 |
.init = local_init, |
| 737 |
.lstat = local_lstat, |
| 738 |
.readlink = local_readlink, |
| 739 |
.close = local_close, |
| 740 |
.closedir = local_closedir, |
| 741 |
.open = local_open, |
| 742 |
.opendir = local_opendir, |
| 743 |
.rewinddir = local_rewinddir, |
| 744 |
.telldir = local_telldir, |
| 745 |
.readdir_r = local_readdir_r, |
| 746 |
.seekdir = local_seekdir, |
| 747 |
.preadv = local_preadv, |
| 748 |
.pwritev = local_pwritev, |
| 749 |
.chmod = local_chmod, |
| 750 |
.mknod = local_mknod, |
| 751 |
.mkdir = local_mkdir, |
| 752 |
.fstat = local_fstat, |
| 753 |
.open2 = local_open2, |
| 754 |
.symlink = local_symlink, |
| 755 |
.link = local_link, |
| 756 |
.truncate = local_truncate, |
| 757 |
.rename = local_rename, |
| 758 |
.chown = local_chown, |
| 759 |
.utimensat = local_utimensat, |
| 760 |
.remove = local_remove, |
| 761 |
.fsync = local_fsync, |
| 762 |
.statfs = local_statfs, |
| 763 |
.lgetxattr = local_lgetxattr, |
| 764 |
.llistxattr = local_llistxattr, |
| 765 |
.lsetxattr = local_lsetxattr, |
| 766 |
.lremovexattr = local_lremovexattr, |
| 767 |
.name_to_path = local_name_to_path, |
| 768 |
.renameat = local_renameat, |
| 769 |
.unlinkat = local_unlinkat, |
| 770 |
}; |