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/*-
* Copyright (c) 2007 Pawel Jakub Dawidek <pjd@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/types.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/kthread.h>
#include <sys/namei.h>
#include <sys/proc.h>
#include <sys/filedesc.h>
#include <sys/fcntl.h>
#include <sys/linker.h>
#include <sys/kobj.h>
void
kobj_free(void *address, size_t size)
{
kmem_free(address, size);
}
void *
kobj_alloc(size_t size, int flag)
{
return (kmem_alloc(size, (flag & KM_NOWAIT) ? KM_NOSLEEP : KM_SLEEP));
}
void *
kobj_zalloc(size_t size, int flag)
{
void *p;
if ((p = kobj_alloc(size, flag)) != NULL)
bzero(p, size);
return (p);
}
static void *
kobj_open_file_vnode(const char *file)
{
struct thread *td = curthread;
struct nameidata nd;
int error, flags;
if (td->td_proc->p_fd->fd_rdir == NULL)
td->td_proc->p_fd->fd_rdir = rootvnode;
if (td->td_proc->p_fd->fd_cdir == NULL)
td->td_proc->p_fd->fd_cdir = rootvnode;
flags = FREAD;
NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_SYSSPACE, file, td);
error = vn_open_cred(&nd, &flags, 0, curthread->td_ucred, NULL);
NDFREE(&nd, NDF_ONLY_PNBUF);
if (error != 0)
return (NULL);
/* We just unlock so we hold a reference. */
VOP_UNLOCK(nd.ni_vp, 0);
return (nd.ni_vp);
}
static void *
kobj_open_file_loader(const char *file)
{
return (preload_search_by_name(file));
}
struct _buf *
kobj_open_file(const char *file)
{
struct _buf *out;
out = kmem_alloc(sizeof(*out), KM_SLEEP);
out->mounted = root_mounted();
/*
* If root is already mounted we read file using file system,
* if not, we use loader.
*/
if (out->mounted)
out->ptr = kobj_open_file_vnode(file);
else
out->ptr = kobj_open_file_loader(file);
if (out->ptr == NULL) {
kmem_free(out, sizeof(*out));
return ((struct _buf *)-1);
}
return (out);
}
static int
kobj_get_filesize_vnode(struct _buf *file, uint64_t *size)
{
struct vnode *vp = file->ptr;
struct thread *td = curthread;
struct vattr va;
int error;
vn_lock(vp, LK_SHARED | LK_RETRY);
error = VOP_GETATTR(vp, &va, td->td_ucred, td);
VOP_UNLOCK(vp, 0);
if (error == 0)
*size = (uint64_t)va.va_size;
return (error);
}
static int
kobj_get_filesize_loader(struct _buf *file, uint64_t *size)
{
void *ptr;
ptr = preload_search_info(file->ptr, MODINFO_SIZE);
if (ptr == NULL)
return (ENOENT);
*size = (uint64_t)*(size_t *)ptr;
return (0);
}
int
kobj_get_filesize(struct _buf *file, uint64_t *size)
{
if (file->mounted)
return (kobj_get_filesize_vnode(file, size));
else
return (kobj_get_filesize_loader(file, size));
}
int
kobj_read_file_vnode(struct _buf *file, char *buf, unsigned size, unsigned off)
{
struct vnode *vp = file->ptr;
struct thread *td = curthread;
struct uio auio;
struct iovec aiov;
int error;
bzero(&aiov, sizeof(aiov));
bzero(&auio, sizeof(auio));
aiov.iov_base = buf;
aiov.iov_len = size;
auio.uio_iov = &aiov;
auio.uio_offset = (off_t)off;
auio.uio_segflg = UIO_SYSSPACE;
auio.uio_rw = UIO_READ;
auio.uio_iovcnt = 1;
auio.uio_resid = size;
auio.uio_td = td;
vn_lock(vp, LK_SHARED | LK_RETRY);
error = VOP_READ(vp, &auio, IO_UNIT | IO_SYNC, td->td_ucred);
VOP_UNLOCK(vp, 0);
return (error != 0 ? -1 : size - auio.uio_resid);
}
int
kobj_read_file_loader(struct _buf *file, char *buf, unsigned size, unsigned off)
{
char *ptr;
ptr = preload_search_info(file->ptr, MODINFO_ADDR);
if (ptr == NULL)
return (ENOENT);
ptr = *(void **)ptr;
bcopy(ptr + off, buf, size);
return (0);
}
int
kobj_read_file(struct _buf *file, char *buf, unsigned size, unsigned off)
{
if (file->mounted)
return (kobj_read_file_vnode(file, buf, size, off));
else
return (kobj_read_file_loader(file, buf, size, off));
}
void
kobj_close_file(struct _buf *file)
{
if (file->mounted) {
struct vnode *vp = file->ptr;
struct thread *td = curthread;
int flags = FREAD;
vn_close(vp, flags, td->td_ucred, td);
}
kmem_free(file, sizeof(*file));
}
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