#include <mach/vm_param.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/signalvar.h>
#include <sys/resourcevar.h>
#include <sys/namei.h>
#include <sys/vnode_internal.h>
#include <sys/proc_internal.h>
#include <sys/kauth.h>
#include <sys/timeb.h>
#include <sys/times.h>
#include <sys/acct.h>
#include <sys/file_internal.h>
#include <sys/uio.h>
#include <sys/kernel.h>
#include <sys/stat.h>
#include <sys/disk.h>
#include <sys/conf.h>
#include <mach-o/loader.h>
#include <mach-o/nlist.h>
#include <kern/kalloc.h>
#include <vm/vm_kern.h>
#include <pexpert/pexpert.h>
#include <IOKit/IOHibernatePrivate.h>
int
get_kernel_symfile(__unused proc_t p, __unused char const **symfile)
{
return KERN_FAILURE;
}
struct kern_direct_file_io_ref_t
{
vfs_context_t ctx;
struct vnode *vp;
};
static int file_ioctl(void * p1, void * p2, int theIoctl, caddr_t result)
{
dev_t device = (dev_t) p1;
return ((*bdevsw[major(device)].d_ioctl)
(device, theIoctl, result, S_IFBLK, p2));
}
static int device_ioctl(void * p1, __unused void * p2, int theIoctl, caddr_t result)
{
return (VNOP_IOCTL(p1, theIoctl, result, 0, p2));
}
struct kern_direct_file_io_ref_t *
kern_open_file_for_direct_io(const char * name,
kern_get_file_extents_callback_t callback,
void * callback_ref,
dev_t * device_result,
uint64_t * partitionbase_result,
uint64_t * maxiocount_result)
{
struct kern_direct_file_io_ref_t * ref;
proc_t p;
struct vnode_attr va;
int error;
off_t f_offset;
uint32_t blksize;
uint64_t size;
dev_t device;
off_t maxiocount, count;
int (*do_ioctl)(void * p1, void * p2, int theIoctl, caddr_t result);
void * p1;
void * p2;
error = EFAULT;
ref = (struct kern_direct_file_io_ref_t *) kalloc(sizeof(struct kern_direct_file_io_ref_t));
if (!ref)
{
error = EFAULT;
goto out;
}
ref->vp = NULL;
p = current_proc(); ref->ctx = vfs_context_create(vfs_context_current());
if ((error = vnode_open(name, (O_CREAT | FWRITE), (0), 0, &ref->vp, ref->ctx)))
goto out;
VATTR_INIT(&va);
VATTR_WANTED(&va, va_rdev);
VATTR_WANTED(&va, va_fsid);
VATTR_WANTED(&va, va_data_size);
VATTR_WANTED(&va, va_nlink);
error = EFAULT;
if (vnode_getattr(ref->vp, &va, ref->ctx))
goto out;
kprintf("vp va_rdev major %d minor %d\n", major(va.va_rdev), minor(va.va_rdev));
kprintf("vp va_fsid major %d minor %d\n", major(va.va_fsid), minor(va.va_fsid));
kprintf("vp size %qd\n", va.va_data_size);
if (ref->vp->v_type == VREG)
{
if (va.va_nlink != 1)
goto out;
device = va.va_fsid;
p1 = (void *) device;
p2 = p;
do_ioctl = &file_ioctl;
}
else if ((ref->vp->v_type == VBLK) || (ref->vp->v_type == VCHR))
{
device = va.va_rdev;
p1 = ref->vp;
p2 = ref->ctx;
do_ioctl = &device_ioctl;
}
else
{
error = EFAULT;
goto out;
}
error = do_ioctl(p1, p2, DKIOCGETBASE, (caddr_t) partitionbase_result);
if (error)
goto out;
error = do_ioctl(p1, p2, DKIOCGETBLOCKSIZE, (caddr_t) &blksize);
if (error)
goto out;
maxiocount = 1*1024*1024*1024;
error = do_ioctl(p1, p2, DKIOCGETMAXBLOCKCOUNTREAD, (caddr_t) &count);
if (error)
count = 0;
count *= blksize;
if (count && (count < maxiocount))
maxiocount = count;
error = do_ioctl(p1, p2, DKIOCGETMAXBLOCKCOUNTWRITE, (caddr_t) &count);
if (error)
count = 0;
count *= blksize;
if (count && (count < maxiocount))
maxiocount = count;
error = do_ioctl(p1, p2, DKIOCGETMAXBYTECOUNTREAD, (caddr_t) &count);
if (error)
count = 0;
if (count && (count < maxiocount))
maxiocount = count;
error = do_ioctl(p1, p2, DKIOCGETMAXBYTECOUNTWRITE, (caddr_t) &count);
if (error)
count = 0;
if (count && (count < maxiocount))
maxiocount = count;
error = do_ioctl(p1, p2, DKIOCGETMAXSEGMENTBYTECOUNTREAD, (caddr_t) &count);
if (error)
count = 0;
if (count && (count < maxiocount))
maxiocount = count;
error = do_ioctl(p1, p2, DKIOCGETMAXSEGMENTBYTECOUNTWRITE, (caddr_t) &count);
if (error)
count = 0;
if (count && (count < maxiocount))
maxiocount = count;
kprintf("max io 0x%qx bytes\n", maxiocount);
if (maxiocount_result)
*maxiocount_result = maxiocount;
error = 0;
if (ref->vp->v_type == VREG)
{
f_offset = 0;
while(f_offset < (off_t) va.va_data_size)
{
size_t io_size = 1*1024*1024*1024;
daddr64_t blkno;
error = VNOP_BLOCKMAP(ref->vp, f_offset, io_size, &blkno, (size_t *)&io_size, NULL, 0, NULL);
if (error)
goto out;
callback(callback_ref, ((uint64_t) blkno) * blksize, (uint64_t) io_size);
f_offset += io_size;
}
callback(callback_ref, 0ULL, 0ULL);
}
else if ((ref->vp->v_type == VBLK) || (ref->vp->v_type == VCHR))
{
error = do_ioctl(p1, p2, DKIOCGETBLOCKCOUNT, (caddr_t) &size);
if (error)
goto out;
size *= blksize;
callback(callback_ref, 0ULL, size);
callback(callback_ref, size, 0ULL);
}
if (device_result)
*device_result = device;
out:
kprintf("kern_open_file_for_direct_io(%d)\n", error);
if (error && ref) {
if (ref->vp) {
vnode_close(ref->vp, FWRITE, ref->ctx);
ref->vp = NULLVP;
}
vfs_context_rele(ref->ctx);
kfree(ref, sizeof(struct kern_direct_file_io_ref_t));
ref = NULL;
}
return(ref);
}
int
kern_write_file(struct kern_direct_file_io_ref_t * ref, off_t offset, caddr_t addr, vm_size_t len)
{
return (vn_rdwr(UIO_WRITE, ref->vp,
addr, len, offset,
UIO_SYSSPACE32, IO_SYNC|IO_NODELOCKED|IO_UNIT,
vfs_context_ucred(ref->ctx), (int *) 0,
vfs_context_proc(ref->ctx)));
}
void
kern_close_file_for_direct_io(struct kern_direct_file_io_ref_t * ref)
{
kprintf("kern_close_file_for_direct_io\n");
if (ref) {
int error;
if (ref->vp) {
error = vnode_close(ref->vp, FWRITE, ref->ctx);
ref->vp = NULLVP;
kprintf("vnode_close(%d)\n", error);
}
vfs_context_rele(ref->ctx);
ref->ctx = NULL;
kfree(ref, sizeof(struct kern_direct_file_io_ref_t));
}
}