C++ current_fsuid函数代码示例

int au_test_h_perm(struct inode *h_inode, int mask)
{
	if (!current_fsuid())
		return 0;
	return inode_permission(h_inode, mask);
}

static struct inode *f2fs_new_inode(struct inode *dir, umode_t mode)
{
	struct super_block *sb = dir->i_sb;
	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	nid_t ino;
	struct inode *inode;
	bool nid_free = false;
	int err;

	inode = new_inode(sb);
	if (!inode)
		return ERR_PTR(-ENOMEM);

	f2fs_lock_op(sbi);
	if (!alloc_nid(sbi, &ino)) {
		f2fs_unlock_op(sbi);
		err = -ENOSPC;
		goto fail;
	}
	f2fs_unlock_op(sbi);

#ifdef CONFIG_F2FS_ANDROID_EMULATION_SUPPORT
	if (IS_ANDROID_EMU(sbi, F2FS_I(dir), F2FS_I(dir)))
		f2fs_android_emu(sbi, inode, &inode->i_uid,
				 &inode->i_gid, &mode);
	else {
		inode->i_uid = current_fsuid();

		if (dir->i_mode & S_ISGID) {
			inode->i_gid = dir->i_gid;
			if (S_ISDIR(mode))
				mode |= S_ISGID;
		} else {
			inode->i_gid = current_fsgid();
		}
	}
#else
                inode->i_uid = current_fsuid();

                if (dir->i_mode & S_ISGID) {
                        inode->i_gid = dir->i_gid;
                        if (S_ISDIR(mode))
                                mode |= S_ISGID;
                } else {
                        inode->i_gid = current_fsgid();
                }
#endif

	inode->i_ino = ino;
	inode->i_mode = mode;
	inode->i_blocks = 0;
	inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
	inode->i_generation = sbi->s_next_generation++;

	err = insert_inode_locked(inode);
	if (err) {
		err = -EINVAL;
		nid_free = true;
		goto out;
	}
	trace_f2fs_new_inode(inode, 0);
	mark_inode_dirty(inode);
	return inode;

out:
	clear_nlink(inode);
	unlock_new_inode(inode);
fail:
	trace_f2fs_new_inode(inode, err);
	make_bad_inode(inode);
	iput(inode);
	if (nid_free)
		alloc_nid_failed(sbi, ino);
	return ERR_PTR(err);
}

static int gfs2_xattr_system_set(struct dentry *dentry, const char *name,
				 const void *value, size_t size, int flags,
				 int xtype)
{
	struct inode *inode = dentry->d_inode;
	struct gfs2_sbd *sdp = GFS2_SB(inode);
	struct posix_acl *acl = NULL;
	int error = 0, type;

	if (!sdp->sd_args.ar_posix_acl)
		return -EOPNOTSUPP;

	type = gfs2_acl_type(name);
	if (type < 0)
		return type;
	if (flags & XATTR_CREATE)
		return -EINVAL;
	if (type == ACL_TYPE_DEFAULT && !S_ISDIR(inode->i_mode))
		return value ? -EACCES : 0;
	if ((current_fsuid() != inode->i_uid) && !capable(CAP_FOWNER))
		return -EPERM;
	if (S_ISLNK(inode->i_mode))
		return -EOPNOTSUPP;

	if (!value)
		goto set_acl;

	acl = posix_acl_from_xattr(value, size);
	if (!acl) {
		/*
		 * acl_set_file(3) may request that we set default ACLs with
		 * zero length -- defend (gracefully) against that here.
		 */
		goto out;
	}
	if (IS_ERR(acl)) {
		error = PTR_ERR(acl);
		goto out;
	}

	error = posix_acl_valid(acl);
	if (error)
		goto out_release;

	error = -EINVAL;
	if (acl->a_count > GFS2_ACL_MAX_ENTRIES)
		goto out_release;

	if (type == ACL_TYPE_ACCESS) {
		mode_t mode = inode->i_mode;
		error = posix_acl_equiv_mode(acl, &mode);

		if (error <= 0) {
			posix_acl_release(acl);
			acl = NULL;

			if (error < 0)
				return error;
		}

		error = gfs2_set_mode(inode, mode);
		if (error)
			goto out_release;
	}

set_acl:
	error = __gfs2_xattr_set(inode, name, value, size, 0, GFS2_EATYPE_SYS);
	if (!error) {
		if (acl)
			set_cached_acl(inode, type, acl);
		else
			forget_cached_acl(inode, type);
	}
out_release:
	posix_acl_release(acl);
out:
	return error;
}

int au_test_h_perm(struct inode *h_inode, int mask)
{
	if (uid_eq(current_fsuid(), GLOBAL_ROOT_UID))
		return 0;
	return inode_permission(h_inode, mask);
}

static void fuse_req_init_context(struct fuse_req *req)
{
	req->in.h.uid = from_kuid_munged(&init_user_ns, current_fsuid());
	req->in.h.gid = from_kgid_munged(&init_user_ns, current_fsgid());
	req->in.h.pid = current->pid;
}

static int hpfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
{
	const unsigned char *name = dentry->d_name.name;
	unsigned len = dentry->d_name.len;
	struct buffer_head *bh;
	struct fnode *fnode;
	fnode_secno fno;
	int r;
	struct hpfs_dirent dee;
	struct inode *result = NULL;
	int err;
	if ((err = hpfs_chk_name(name, &len))) return err==-ENOENT ? -EINVAL : err;
	if (hpfs_sb(dir->i_sb)->sb_eas < 2) return -EPERM;
	if (!new_valid_dev(rdev))
		return -EINVAL;
	lock_kernel();
	err = -ENOSPC;
	fnode = hpfs_alloc_fnode(dir->i_sb, hpfs_i(dir)->i_dno, &fno, &bh);
	if (!fnode)
		goto bail;
	memset(&dee, 0, sizeof dee);
	if (!(mode & 0222)) dee.read_only = 1;
	dee.archive = 1;
	dee.hidden = name[0] == '.';
	dee.fnode = fno;
	dee.creation_date = dee.write_date = dee.read_date = gmt_to_local(dir->i_sb, get_seconds());

	result = new_inode(dir->i_sb);
	if (!result)
		goto bail1;

	hpfs_init_inode(result);
	result->i_ino = fno;
	hpfs_i(result)->i_parent_dir = dir->i_ino;
	result->i_ctime.tv_sec = result->i_mtime.tv_sec = result->i_atime.tv_sec = local_to_gmt(dir->i_sb, dee.creation_date);
	result->i_ctime.tv_nsec = 0;
	result->i_mtime.tv_nsec = 0;
	result->i_atime.tv_nsec = 0;
	hpfs_i(result)->i_ea_size = 0;
	result->i_uid = current_fsuid();
	result->i_gid = current_fsgid();
	result->i_nlink = 1;
	result->i_size = 0;
	result->i_blocks = 1;
	init_special_inode(result, mode, rdev);

	mutex_lock(&hpfs_i(dir)->i_mutex);
	r = hpfs_add_dirent(dir, name, len, &dee, 0);
	if (r == 1)
		goto bail2;
	if (r == -1) {
		err = -EEXIST;
		goto bail2;
	}
	fnode->len = len;
	memcpy(fnode->name, name, len > 15 ? 15 : len);
	fnode->up = dir->i_ino;
	mark_buffer_dirty(bh);

	insert_inode_hash(result);

	hpfs_write_inode_nolock(result);
	d_instantiate(dentry, result);
	mutex_unlock(&hpfs_i(dir)->i_mutex);
	brelse(bh);
	unlock_kernel();
	return 0;
bail2:
	mutex_unlock(&hpfs_i(dir)->i_mutex);
	iput(result);
bail1:
	brelse(bh);
	hpfs_free_sectors(dir->i_sb, fno, 1);
bail:
	unlock_kernel();
	return err;
}

int
xfs_symlink(
	struct xfs_inode	*dp,
	struct xfs_name		*link_name,
	const char		*target_path,
	umode_t			mode,
	struct xfs_inode	**ipp)
{
	struct xfs_mount	*mp = dp->i_mount;
	struct xfs_trans	*tp = NULL;
	struct xfs_inode	*ip = NULL;
	int			error = 0;
	int			pathlen;
	struct xfs_bmap_free	free_list;
	xfs_fsblock_t		first_block;
	bool                    unlock_dp_on_error = false;
	xfs_fileoff_t		first_fsb;
	xfs_filblks_t		fs_blocks;
	int			nmaps;
	struct xfs_bmbt_irec	mval[XFS_SYMLINK_MAPS];
	xfs_daddr_t		d;
	const char		*cur_chunk;
	int			byte_cnt;
	int			n;
	xfs_buf_t		*bp;
	prid_t			prid;
	struct xfs_dquot	*udqp = NULL;
	struct xfs_dquot	*gdqp = NULL;
	struct xfs_dquot	*pdqp = NULL;
	uint			resblks;

	*ipp = NULL;

	trace_xfs_symlink(dp, link_name);

	if (XFS_FORCED_SHUTDOWN(mp))
		return -EIO;

	/*
	 * Check component lengths of the target path name.
	 */
	pathlen = strlen(target_path);
	if (pathlen >= MAXPATHLEN)      /* total string too long */
		return -ENAMETOOLONG;

	udqp = gdqp = NULL;
	prid = xfs_get_initial_prid(dp);

	/*
	 * Make sure that we have allocated dquot(s) on disk.
	 */
	error = xfs_qm_vop_dqalloc(dp,
			xfs_kuid_to_uid(current_fsuid()),
			xfs_kgid_to_gid(current_fsgid()), prid,
			XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT,
			&udqp, &gdqp, &pdqp);
	if (error)
		return error;

	/*
	 * The symlink will fit into the inode data fork?
	 * There can't be any attributes so we get the whole variable part.
	 */
	if (pathlen <= XFS_LITINO(mp, dp->i_d.di_version))
		fs_blocks = 0;
	else
		fs_blocks = xfs_symlink_blocks(mp, pathlen);
	resblks = XFS_SYMLINK_SPACE_RES(mp, link_name->len, fs_blocks);

	error = xfs_trans_alloc(mp, &M_RES(mp)->tr_symlink, resblks, 0, 0, &tp);
	if (error == -ENOSPC && fs_blocks == 0) {
		resblks = 0;
		error = xfs_trans_alloc(mp, &M_RES(mp)->tr_symlink, 0, 0, 0,
				&tp);
	}
	if (error)
		goto out_release_inode;

	xfs_ilock(dp, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL |
		      XFS_IOLOCK_PARENT | XFS_ILOCK_PARENT);
	unlock_dp_on_error = true;

	/*
	 * Check whether the directory allows new symlinks or not.
	 */
	if (dp->i_d.di_flags & XFS_DIFLAG_NOSYMLINKS) {
		error = -EPERM;
		goto out_trans_cancel;
	}

	/*
	 * Reserve disk quota : blocks and inode.
	 */
	error = xfs_trans_reserve_quota(tp, mp, udqp, gdqp,
						pdqp, resblks, 1, 0);
	if (error)
		goto out_trans_cancel;

	/*
	 * Check for ability to enter directory entry, if no space reserved.
//.........这里部分代码省略.........

static int hpfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
{
	const unsigned char *name = dentry->d_name.name;
	unsigned len = dentry->d_name.len;
	struct quad_buffer_head qbh0;
	struct buffer_head *bh;
	struct hpfs_dirent *de;
	struct fnode *fnode;
	struct dnode *dnode;
	struct inode *result;
	fnode_secno fno;
	dnode_secno dno;
	int r;
	struct hpfs_dirent dee;
	int err;
	if ((err = hpfs_chk_name(name, &len))) return err==-ENOENT ? -EINVAL : err;
	lock_kernel();
	err = -ENOSPC;
	fnode = hpfs_alloc_fnode(dir->i_sb, hpfs_i(dir)->i_dno, &fno, &bh);
	if (!fnode)
		goto bail;
	dnode = hpfs_alloc_dnode(dir->i_sb, fno, &dno, &qbh0, 1);
	if (!dnode)
		goto bail1;
	memset(&dee, 0, sizeof dee);
	dee.directory = 1;
	if (!(mode & 0222)) dee.read_only = 1;
	/*dee.archive = 0;*/
	dee.hidden = name[0] == '.';
	dee.fnode = fno;
	dee.creation_date = dee.write_date = dee.read_date = gmt_to_local(dir->i_sb, get_seconds());
	result = new_inode(dir->i_sb);
	if (!result)
		goto bail2;
	hpfs_init_inode(result);
	result->i_ino = fno;
	hpfs_i(result)->i_parent_dir = dir->i_ino;
	hpfs_i(result)->i_dno = dno;
	result->i_ctime.tv_sec = result->i_mtime.tv_sec = result->i_atime.tv_sec = local_to_gmt(dir->i_sb, dee.creation_date);
	result->i_ctime.tv_nsec = 0; 
	result->i_mtime.tv_nsec = 0; 
	result->i_atime.tv_nsec = 0; 
	hpfs_i(result)->i_ea_size = 0;
	result->i_mode |= S_IFDIR;
	result->i_op = &hpfs_dir_iops;
	result->i_fop = &hpfs_dir_ops;
	result->i_blocks = 4;
	result->i_size = 2048;
	result->i_nlink = 2;
	if (dee.read_only)
		result->i_mode &= ~0222;

	mutex_lock(&hpfs_i(dir)->i_mutex);
	r = hpfs_add_dirent(dir, name, len, &dee, 0);
	if (r == 1)
		goto bail3;
	if (r == -1) {
		err = -EEXIST;
		goto bail3;
	}
	fnode->len = len;
	memcpy(fnode->name, name, len > 15 ? 15 : len);
	fnode->up = dir->i_ino;
	fnode->dirflag = 1;
	fnode->btree.n_free_nodes = 7;
	fnode->btree.n_used_nodes = 1;
	fnode->btree.first_free = 0x14;
	fnode->u.external[0].disk_secno = dno;
	fnode->u.external[0].file_secno = -1;
	dnode->root_dnode = 1;
	dnode->up = fno;
	de = hpfs_add_de(dir->i_sb, dnode, "\001\001", 2, 0);
	de->creation_date = de->write_date = de->read_date = gmt_to_local(dir->i_sb, get_seconds());
	if (!(mode & 0222)) de->read_only = 1;
	de->first = de->directory = 1;
	/*de->hidden = de->system = 0;*/
	de->fnode = fno;
	mark_buffer_dirty(bh);
	brelse(bh);
	hpfs_mark_4buffers_dirty(&qbh0);
	hpfs_brelse4(&qbh0);
	inc_nlink(dir);
	insert_inode_hash(result);

	if (result->i_uid != current_fsuid() ||
	    result->i_gid != current_fsgid() ||
	    result->i_mode != (mode | S_IFDIR)) {
		result->i_uid = current_fsuid();
		result->i_gid = current_fsgid();
		result->i_mode = mode | S_IFDIR;
		hpfs_write_inode_nolock(result);
	}
	d_instantiate(dentry, result);
	mutex_unlock(&hpfs_i(dir)->i_mutex);
	unlock_kernel();
	return 0;
bail3:
	mutex_unlock(&hpfs_i(dir)->i_mutex);
	iput(result);
bail2:
//.........这里部分代码省略.........

static int hpfs_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *nd)
{
	const unsigned char *name = dentry->d_name.name;
	unsigned len = dentry->d_name.len;
	struct inode *result = NULL;
	struct buffer_head *bh;
	struct fnode *fnode;
	fnode_secno fno;
	int r;
	struct hpfs_dirent dee;
	int err;
	if ((err = hpfs_chk_name(name, &len)))
		return err==-ENOENT ? -EINVAL : err;
	lock_kernel();
	err = -ENOSPC;
	fnode = hpfs_alloc_fnode(dir->i_sb, hpfs_i(dir)->i_dno, &fno, &bh);
	if (!fnode)
		goto bail;
	memset(&dee, 0, sizeof dee);
	if (!(mode & 0222)) dee.read_only = 1;
	dee.archive = 1;
	dee.hidden = name[0] == '.';
	dee.fnode = fno;
	dee.creation_date = dee.write_date = dee.read_date = gmt_to_local(dir->i_sb, get_seconds());

	result = new_inode(dir->i_sb);
	if (!result)
		goto bail1;
	
	hpfs_init_inode(result);
	result->i_ino = fno;
	result->i_mode |= S_IFREG;
	result->i_mode &= ~0111;
	result->i_op = &hpfs_file_iops;
	result->i_fop = &hpfs_file_ops;
	result->i_nlink = 1;
	hpfs_decide_conv(result, name, len);
	hpfs_i(result)->i_parent_dir = dir->i_ino;
	result->i_ctime.tv_sec = result->i_mtime.tv_sec = result->i_atime.tv_sec = local_to_gmt(dir->i_sb, dee.creation_date);
	result->i_ctime.tv_nsec = 0;
	result->i_mtime.tv_nsec = 0;
	result->i_atime.tv_nsec = 0;
	hpfs_i(result)->i_ea_size = 0;
	if (dee.read_only)
		result->i_mode &= ~0222;
	result->i_blocks = 1;
	result->i_size = 0;
	result->i_data.a_ops = &hpfs_aops;
	hpfs_i(result)->mmu_private = 0;

	mutex_lock(&hpfs_i(dir)->i_mutex);
	r = hpfs_add_dirent(dir, name, len, &dee, 0);
	if (r == 1)
		goto bail2;
	if (r == -1) {
		err = -EEXIST;
		goto bail2;
	}
	fnode->len = len;
	memcpy(fnode->name, name, len > 15 ? 15 : len);
	fnode->up = dir->i_ino;
	mark_buffer_dirty(bh);
	brelse(bh);

	insert_inode_hash(result);

	if (result->i_uid != current_fsuid() ||
	    result->i_gid != current_fsgid() ||
	    result->i_mode != (mode | S_IFREG)) {
		result->i_uid = current_fsuid();
		result->i_gid = current_fsgid();
		result->i_mode = mode | S_IFREG;
		hpfs_write_inode_nolock(result);
	}
	d_instantiate(dentry, result);
	mutex_unlock(&hpfs_i(dir)->i_mutex);
	unlock_kernel();
	return 0;

bail2:
	mutex_unlock(&hpfs_i(dir)->i_mutex);
	iput(result);
bail1:
	brelse(bh);
	hpfs_free_sectors(dir->i_sb, fno, 1);
bail:
	unlock_kernel();
	return err;
}

static int
xfs_xattr_acl_set(struct dentry *dentry, const char *name,
		const void *value, size_t size, int flags, int type)
{
	struct inode *inode = dentry->d_inode;
	struct posix_acl *acl = NULL;
	int error = 0;

	if (flags & XATTR_CREATE)
		return -EINVAL;
	if (type == ACL_TYPE_DEFAULT && !S_ISDIR(inode->i_mode))
		return value ? -EACCES : 0;
	if ((current_fsuid() != inode->i_uid) && !capable(CAP_FOWNER))
		return -EPERM;

	if (!value)
		goto set_acl;

	acl = posix_acl_from_xattr(value, size);
	if (!acl) {
		/*
		 * acl_set_file(3) may request that we set default ACLs with
		 * zero length -- defend (gracefully) against that here.
		 */
		goto out;
	}
	if (IS_ERR(acl)) {
		error = PTR_ERR(acl);
		goto out;
	}

	error = posix_acl_valid(acl);
	if (error)
		goto out_release;

	error = -EINVAL;
	if (acl->a_count > XFS_ACL_MAX_ENTRIES)
		goto out_release;

	if (type == ACL_TYPE_ACCESS) {
		mode_t mode = inode->i_mode;
		error = posix_acl_equiv_mode(acl, &mode);

		if (error <= 0) {
			posix_acl_release(acl);
			acl = NULL;

			if (error < 0)
				return error;
		}

		error = xfs_set_mode(inode, mode);
		if (error)
			goto out_release;
	}

 set_acl:
	error = xfs_set_acl(inode, type, acl);
 out_release:
	posix_acl_release(acl);
 out:
	return error;
}

/*
 * NAME:	ialloc()
 *
 * FUNCTION:	Allocate a new inode
 *
 */
struct inode *ialloc(struct inode *parent, umode_t mode)
{
	struct super_block *sb = parent->i_sb;
	struct inode *inode;
	struct jfs_inode_info *jfs_inode;
	int rc;

	inode = new_inode(sb);
	if (!inode) {
		jfs_warn("ialloc: new_inode returned NULL!");
		rc = -ENOMEM;
		goto fail;
	}

	jfs_inode = JFS_IP(inode);

	rc = diAlloc(parent, S_ISDIR(mode), inode);
	if (rc) {
		jfs_warn("ialloc: diAlloc returned %d!", rc);
		if (rc == -EIO)
			make_bad_inode(inode);
		goto fail_put;
	}

	if (insert_inode_locked(inode) < 0) {
		rc = -EINVAL;
		goto fail_unlock;
	}

	inode->i_uid = current_fsuid();
	if (parent->i_mode & S_ISGID) {
		inode->i_gid = parent->i_gid;
		if (S_ISDIR(mode))
			mode |= S_ISGID;
	} else
		inode->i_gid = current_fsgid();

	/*
	 * New inodes need to save sane values on disk when
	 * uid & gid mount options are used
	 */
	jfs_inode->saved_uid = inode->i_uid;
	jfs_inode->saved_gid = inode->i_gid;

	/*
	 * Allocate inode to quota.
	 */
	if (vfs_dq_alloc_inode(inode)) {
		rc = -EDQUOT;
		goto fail_drop;
	}

	inode->i_mode = mode;
	/* inherit flags from parent */
	jfs_inode->mode2 = JFS_IP(parent)->mode2 & JFS_FL_INHERIT;

	if (S_ISDIR(mode)) {
		jfs_inode->mode2 |= IDIRECTORY;
		jfs_inode->mode2 &= ~JFS_DIRSYNC_FL;
	}
	else {
		jfs_inode->mode2 |= INLINEEA | ISPARSE;
		if (S_ISLNK(mode))
			jfs_inode->mode2 &= ~(JFS_IMMUTABLE_FL|JFS_APPEND_FL);
	}
	jfs_inode->mode2 |= mode;

	inode->i_blocks = 0;
	inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
	jfs_inode->otime = inode->i_ctime.tv_sec;
	inode->i_generation = JFS_SBI(sb)->gengen++;

	jfs_inode->cflag = 0;

	/* Zero remaining fields */
	memset(&jfs_inode->acl, 0, sizeof(dxd_t));
	memset(&jfs_inode->ea, 0, sizeof(dxd_t));
	jfs_inode->next_index = 0;
	jfs_inode->acltype = 0;
	jfs_inode->btorder = 0;
	jfs_inode->btindex = 0;
	jfs_inode->bxflag = 0;
	jfs_inode->blid = 0;
	jfs_inode->atlhead = 0;
	jfs_inode->atltail = 0;
	jfs_inode->xtlid = 0;
	jfs_set_inode_flags(inode);

	jfs_info("ialloc returns inode = 0x%p\n", inode);

	return inode;

fail_drop:
	vfs_dq_drop(inode);
//.........这里部分代码省略.........

/**
 * tomoyo_print_header - Get header line of audit log.
 *
 * @r: Pointer to "struct tomoyo_request_info".
 *
 * Returns string representation.
 *
 * This function uses kmalloc(), so caller must kfree() if this function
 * didn't return NULL.
 */
static char *tomoyo_print_header(struct tomoyo_request_info *r)
{
	struct tomoyo_time stamp;
	const pid_t gpid = task_pid_nr(current);
	struct tomoyo_obj_info *obj = r->obj;
	static const int tomoyo_buffer_len = 4096;
	char *buffer = kmalloc(tomoyo_buffer_len, GFP_NOFS);
	int pos;
	u8 i;
	if (!buffer)
		return NULL;
	{
		struct timeval tv;
		do_gettimeofday(&tv);
		tomoyo_convert_time(tv.tv_sec, &stamp);
	}
	pos = snprintf(buffer, tomoyo_buffer_len - 1,
		       "#%04u/%02u/%02u %02u:%02u:%02u# profile=%u mode=%s "
		       "granted=%s (global-pid=%u) task={ pid=%u ppid=%u "
		       "uid=%u gid=%u euid=%u egid=%u suid=%u sgid=%u "
		       "fsuid=%u fsgid=%u }", stamp.year, stamp.month,
		       stamp.day, stamp.hour, stamp.min, stamp.sec, r->profile,
		       tomoyo_mode[r->mode], tomoyo_yesno(r->granted), gpid,
		       tomoyo_sys_getpid(), tomoyo_sys_getppid(),
		       from_kuid(&init_user_ns, current_uid()),
		       from_kgid(&init_user_ns, current_gid()),
		       from_kuid(&init_user_ns, current_euid()),
		       from_kgid(&init_user_ns, current_egid()),
		       from_kuid(&init_user_ns, current_suid()),
		       from_kgid(&init_user_ns, current_sgid()),
		       from_kuid(&init_user_ns, current_fsuid()),
		       from_kgid(&init_user_ns, current_fsgid()));
	if (!obj)
		goto no_obj_info;
	if (!obj->validate_done) {
		tomoyo_get_attributes(obj);
		obj->validate_done = true;
	}
	for (i = 0; i < TOMOYO_MAX_PATH_STAT; i++) {
		struct tomoyo_mini_stat *stat;
		unsigned int dev;
		umode_t mode;
		if (!obj->stat_valid[i])
			continue;
		stat = &obj->stat[i];
		dev = stat->dev;
		mode = stat->mode;
		if (i & 1) {
			pos += snprintf(buffer + pos,
					tomoyo_buffer_len - 1 - pos,
					" path%u.parent={ uid=%u gid=%u "
					"ino=%lu perm=0%o }", (i >> 1) + 1,
					from_kuid(&init_user_ns, stat->uid),
					from_kgid(&init_user_ns, stat->gid),
					(unsigned long)stat->ino,
					stat->mode & S_IALLUGO);
			continue;
		}
		pos += snprintf(buffer + pos, tomoyo_buffer_len - 1 - pos,
				" path%u={ uid=%u gid=%u ino=%lu major=%u"
				" minor=%u perm=0%o type=%s", (i >> 1) + 1,
				from_kuid(&init_user_ns, stat->uid),
				from_kgid(&init_user_ns, stat->gid),
				(unsigned long)stat->ino,
				MAJOR(dev), MINOR(dev),
				mode & S_IALLUGO, tomoyo_filetype(mode));
		if (S_ISCHR(mode) || S_ISBLK(mode)) {
			dev = stat->rdev;
			pos += snprintf(buffer + pos,
					tomoyo_buffer_len - 1 - pos,
					" dev_major=%u dev_minor=%u",
					MAJOR(dev), MINOR(dev));
		}
		pos += snprintf(buffer + pos, tomoyo_buffer_len - 1 - pos,
				" }");
	}

//.........这里部分代码省略.........
	/*
	 * if we're not using unix extensions, see if we need to set
	 * ATTR_READONLY on the create call
	 */
	if (!tcon->unix_ext && (mode & S_IWUGO) == 0)
		create_options |= CREATE_OPTION_READONLY;

	if (backup_cred(cifs_sb))
		create_options |= CREATE_OPEN_BACKUP_INTENT;

	oparms.tcon = tcon;
	oparms.cifs_sb = cifs_sb;
	oparms.desired_access = desired_access;
	oparms.create_options = create_options;
	oparms.disposition = disposition;
	oparms.path = full_path;
	oparms.fid = fid;
	oparms.reconnect = false;

	rc = server->ops->open(xid, &oparms, oplock, buf);
	if (rc) {
		cifs_dbg(FYI, "cifs_create returned 0x%x\n", rc);
		goto out;
	}

	/*
	 * If Open reported that we actually created a file then we now have to
	 * set the mode if possible.
	 */
	if ((tcon->unix_ext) && (*oplock & CIFS_CREATE_ACTION)) {
		struct cifs_unix_set_info_args args = {
				.mode	= mode,
				.ctime	= NO_CHANGE_64,
				.atime	= NO_CHANGE_64,
				.mtime	= NO_CHANGE_64,
				.device	= 0,
		};

		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
			args.uid = current_fsuid();
			if (inode->i_mode & S_ISGID)
				args.gid = inode->i_gid;
			else
				args.gid = current_fsgid();
		} else {
			args.uid = INVALID_UID; /* no change */
			args.gid = INVALID_GID; /* no change */
		}
		CIFSSMBUnixSetFileInfo(xid, tcon, &args, fid->netfid,
				       current->tgid);
	} else {
		/*
		 * BB implement mode setting via Windows security
		 * descriptors e.g.
		 */
		/* CIFSSMBWinSetPerms(xid,tcon,path,mode,-1,-1,nls);*/

		/* Could set r/o dos attribute if mode & 0222 == 0 */
	}

cifs_create_get_file_info:
	/* server might mask mode so we have to query for it */
	if (tcon->unix_ext)
		rc = cifs_get_inode_info_unix(&newinode, full_path, inode->i_sb,
					      xid);
	else {
		rc = cifs_get_inode_info(&newinode, full_path, buf, inode->i_sb,
					 xid, fid);
		if (newinode) {
			if (server->ops->set_lease_key)
				server->ops->set_lease_key(newinode, fid);
			if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
				newinode->i_mode = mode;
			if ((*oplock & CIFS_CREATE_ACTION) &&
			    (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)) {
				newinode->i_uid = current_fsuid();
				if (inode->i_mode & S_ISGID)
					newinode->i_gid = inode->i_gid;
				else
					newinode->i_gid = current_fsgid();
			}
		}
	}

cifs_create_set_dentry:
	if (rc != 0) {
		cifs_dbg(FYI, "Create worked, get_inode_info failed rc = %d\n",
			 rc);
		if (server->ops->close)
			server->ops->close(xid, tcon, fid);
		goto out;
	}
	d_drop(direntry);
	d_add(direntry, newinode);

out:
	kfree(buf);
	kfree(full_path);
	return rc;
}

static int hpfs_symlink(struct inode *dir, struct dentry *dentry, const char *symlink)
{
	const unsigned char *name = dentry->d_name.name;
	unsigned len = dentry->d_name.len;
	struct buffer_head *bh;
	struct fnode *fnode;
	fnode_secno fno;
	int r;
	struct hpfs_dirent dee;
	struct inode *result;
	int err;
	if ((err = hpfs_chk_name(name, &len))) return err==-ENOENT ? -EINVAL : err;
	lock_kernel();
	if (hpfs_sb(dir->i_sb)->sb_eas < 2) {
		unlock_kernel();
		return -EPERM;
	}
	err = -ENOSPC;
	fnode = hpfs_alloc_fnode(dir->i_sb, hpfs_i(dir)->i_dno, &fno, &bh);
	if (!fnode)
		goto bail;
	memset(&dee, 0, sizeof dee);
	dee.archive = 1;
	dee.hidden = name[0] == '.';
	dee.fnode = fno;
	dee.creation_date = dee.write_date = dee.read_date = gmt_to_local(dir->i_sb, get_seconds());

	result = new_inode(dir->i_sb);
	if (!result)
		goto bail1;
	result->i_ino = fno;
	hpfs_init_inode(result);
	hpfs_i(result)->i_parent_dir = dir->i_ino;
	result->i_ctime.tv_sec = result->i_mtime.tv_sec = result->i_atime.tv_sec = local_to_gmt(dir->i_sb, dee.creation_date);
	result->i_ctime.tv_nsec = 0;
	result->i_mtime.tv_nsec = 0;
	result->i_atime.tv_nsec = 0;
	hpfs_i(result)->i_ea_size = 0;
	result->i_mode = S_IFLNK | 0777;
	result->i_uid = current_fsuid();
	result->i_gid = current_fsgid();
	result->i_blocks = 1;
	result->i_nlink = 1;
	result->i_size = strlen(symlink);
	result->i_op = &page_symlink_inode_operations;
	result->i_data.a_ops = &hpfs_symlink_aops;

	mutex_lock(&hpfs_i(dir)->i_mutex);
	r = hpfs_add_dirent(dir, name, len, &dee, 0);
	if (r == 1)
		goto bail2;
	if (r == -1) {
		err = -EEXIST;
		goto bail2;
	}
	fnode->len = len;
	memcpy(fnode->name, name, len > 15 ? 15 : len);
	fnode->up = dir->i_ino;
	hpfs_set_ea(result, fnode, "SYMLINK", symlink, strlen(symlink));
	mark_buffer_dirty(bh);
	brelse(bh);

	insert_inode_hash(result);

	hpfs_write_inode_nolock(result);
	d_instantiate(dentry, result);
	mutex_unlock(&hpfs_i(dir)->i_mutex);
	unlock_kernel();
	return 0;
bail2:
	mutex_unlock(&hpfs_i(dir)->i_mutex);
	iput(result);
bail1:
	brelse(bh);
	hpfs_free_sectors(dir->i_sb, fno, 1);
bail:
	unlock_kernel();
	return err;
}

int cifs_mknod(struct inode *inode, struct dentry *direntry, umode_t mode,
		dev_t device_number)
{
	int rc = -EPERM;
	unsigned int xid;
	int create_options = CREATE_NOT_DIR | CREATE_OPTION_SPECIAL;
	struct cifs_sb_info *cifs_sb;
	struct tcon_link *tlink;
	struct cifs_tcon *tcon;
	struct cifs_io_parms io_parms;
	char *full_path = NULL;
	struct inode *newinode = NULL;
	int oplock = 0;
	struct cifs_fid fid;
	struct cifs_open_parms oparms;
	FILE_ALL_INFO *buf = NULL;
	unsigned int bytes_written;
	struct win_dev *pdev;

	if (!old_valid_dev(device_number))
		return -EINVAL;

	cifs_sb = CIFS_SB(inode->i_sb);
	tlink = cifs_sb_tlink(cifs_sb);
	if (IS_ERR(tlink))
		return PTR_ERR(tlink);

	tcon = tlink_tcon(tlink);

	xid = get_xid();

	full_path = build_path_from_dentry(direntry);
	if (full_path == NULL) {
		rc = -ENOMEM;
		goto mknod_out;
	}

	if (tcon->unix_ext) {
		struct cifs_unix_set_info_args args = {
			.mode	= mode & ~current_umask(),
			.ctime	= NO_CHANGE_64,
			.atime	= NO_CHANGE_64,
			.mtime	= NO_CHANGE_64,
			.device	= device_number,
		};
		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
			args.uid = current_fsuid();
			args.gid = current_fsgid();
		} else {
			args.uid = INVALID_UID; /* no change */
			args.gid = INVALID_GID; /* no change */
		}
		rc = CIFSSMBUnixSetPathInfo(xid, tcon, full_path, &args,
					    cifs_sb->local_nls,
					    cifs_sb->mnt_cifs_flags &
						CIFS_MOUNT_MAP_SPECIAL_CHR);
		if (rc)
			goto mknod_out;

		rc = cifs_get_inode_info_unix(&newinode, full_path,
						inode->i_sb, xid);

		if (rc == 0)
			d_instantiate(direntry, newinode);
		goto mknod_out;
	}

	if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL))
		goto mknod_out;


	cifs_dbg(FYI, "sfu compat create special file\n");

	buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
	if (buf == NULL) {
		kfree(full_path);
		rc = -ENOMEM;
		free_xid(xid);
		return rc;
	}

	if (backup_cred(cifs_sb))
		create_options |= CREATE_OPEN_BACKUP_INTENT;

	oparms.tcon = tcon;
	oparms.cifs_sb = cifs_sb;
	oparms.desired_access = GENERIC_WRITE;
	oparms.create_options = create_options;
	oparms.disposition = FILE_CREATE;
	oparms.path = full_path;
	oparms.fid = &fid;
	oparms.reconnect = false;

	rc = CIFS_open(xid, &oparms, &oplock, buf);
	if (rc)
		goto mknod_out;

	/*
	 * BB Do not bother to decode buf since no local inode yet to put
	 * timestamps in, but we can reuse it safely.
//.........这里部分代码省略.........