#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 <sys/content_protection.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/IOPolledInterface.h>
int
get_kernel_symfile(__unused proc_t p, __unused char const **symfile);
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;
dev_t device;
uint32_t blksize;
off_t filelength;
char cf;
char pinned;
};
static int file_ioctl(void * p1, void * p2, u_long 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, u_long theIoctl, caddr_t result)
{
return (VNOP_IOCTL(p1, theIoctl, result, 0, p2));
}
static int
kern_ioctl_file_extents(struct kern_direct_file_io_ref_t * ref, u_long theIoctl, off_t offset, off_t end)
{
int error = 0;
int (*do_ioctl)(void * p1, void * p2, u_long theIoctl, caddr_t result);
void * p1;
void * p2;
uint64_t fileblk;
size_t filechunk;
dk_extent_t extent;
dk_unmap_t unmap;
_dk_cs_pin_t pin;
bzero(&extent, sizeof(dk_extent_t));
bzero(&unmap, sizeof(dk_unmap_t));
bzero(&pin, sizeof(pin));
if (ref->vp->v_type == VREG)
{
p1 = &ref->device;
p2 = kernproc;
do_ioctl = &file_ioctl;
}
else
{
p1 = ref->vp;
p2 = ref->ctx;
do_ioctl = &device_ioctl;
}
if (_DKIOCCSPINEXTENT == theIoctl) {
pin.cp_extent.length = end;
pin.cp_flags = _DKIOCCSHIBERNATEIMGSIZE;
(void) do_ioctl(p1, p2, _DKIOCCSPINEXTENT, (caddr_t)&pin);
} else if (_DKIOCCSUNPINEXTENT == theIoctl) {
pin.cp_flags = _DKIOCCSPINDISCARDBLACKLIST;
(void) do_ioctl(p1, p2, _DKIOCCSUNPINEXTENT, (caddr_t)&pin);
}
while (offset < end)
{
if (ref->vp->v_type == VREG)
{
daddr64_t blkno;
filechunk = 1*1024*1024*1024;
if (filechunk > (size_t)(end - offset))
filechunk = (size_t)(end - offset);
error = VNOP_BLOCKMAP(ref->vp, offset, filechunk, &blkno,
&filechunk, NULL, VNODE_WRITE, NULL);
if (error) break;
fileblk = blkno * ref->blksize;
}
else if ((ref->vp->v_type == VBLK) || (ref->vp->v_type == VCHR))
{
fileblk = offset;
filechunk = ref->filelength;
}
if (DKIOCUNMAP == theIoctl)
{
extent.offset = fileblk;
extent.length = filechunk;
unmap.extents = &extent;
unmap.extentsCount = 1;
error = do_ioctl(p1, p2, theIoctl, (caddr_t)&unmap);
}
else if (_DKIOCCSPINEXTENT == theIoctl)
{
pin.cp_extent.offset = fileblk;
pin.cp_extent.length = filechunk;
pin.cp_flags = _DKIOCCSPINFORHIBERNATION;
error = do_ioctl(p1, p2, theIoctl, (caddr_t)&pin);
if (error && (ENOTTY != error))
{
printf("_DKIOCCSPINEXTENT(%d) 0x%qx, 0x%qx\n", error, pin.cp_extent.offset, pin.cp_extent.length);
}
}
else if (_DKIOCCSUNPINEXTENT == theIoctl)
{
pin.cp_extent.offset = fileblk;
pin.cp_extent.length = filechunk;
pin.cp_flags = _DKIOCCSPINFORHIBERNATION;
error = do_ioctl(p1, p2, theIoctl, (caddr_t)&pin);
if (error && (ENOTTY != error))
{
printf("_DKIOCCSUNPINEXTENT(%d) 0x%qx, 0x%qx\n", error, pin.cp_extent.offset, pin.cp_extent.length);
}
}
else error = EINVAL;
if (error) break;
offset += filechunk;
}
return (error);
}
extern uint32_t freespace_mb(vnode_t vp);
struct kern_direct_file_io_ref_t *
kern_open_file_for_direct_io(const char * name,
boolean_t create_file,
kern_get_file_extents_callback_t callback,
void * callback_ref,
off_t set_file_size,
off_t fs_free_size,
off_t write_file_offset,
void * write_file_addr,
size_t write_file_len,
dev_t * partition_device_result,
dev_t * image_device_result,
uint64_t * partitionbase_result,
uint64_t * maxiocount_result,
uint32_t * oflags)
{
struct kern_direct_file_io_ref_t * ref;
proc_t p;
struct vnode_attr va;
int error;
off_t f_offset;
uint64_t fileblk;
size_t filechunk;
uint64_t physoffset;
dev_t device;
dev_t target = 0;
int isssd = 0;
uint32_t flags = 0;
uint32_t blksize;
off_t maxiocount, count, segcount;
boolean_t locked = FALSE;
int fmode, cmode;
struct nameidata nd;
u_int32_t ndflags;
off_t mpFree;
int (*do_ioctl)(void * p1, void * p2, u_long theIoctl, caddr_t result);
void * p1 = NULL;
void * p2 = NULL;
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;
}
bzero(ref, sizeof(*ref));
p = kernproc;
ref->ctx = vfs_context_create(vfs_context_kernel());
fmode = (create_file) ? (O_CREAT | FWRITE) : FWRITE;
cmode = S_IRUSR | S_IWUSR;
ndflags = NOFOLLOW;
NDINIT(&nd, LOOKUP, OP_OPEN, ndflags, UIO_SYSSPACE, CAST_USER_ADDR_T(name), ref->ctx);
VATTR_INIT(&va);
VATTR_SET(&va, va_mode, cmode);
VATTR_SET(&va, va_dataprotect_flags, VA_DP_RAWENCRYPTED);
VATTR_SET(&va, va_dataprotect_class, PROTECTION_CLASS_D);
if ((error = vn_open_auth(&nd, &fmode, &va))) goto out;
ref->vp = nd.ni_vp;
if (ref->vp->v_type == VREG)
{
vnode_lock_spin(ref->vp);
SET(ref->vp->v_flag, VSWAP);
vnode_unlock(ref->vp);
}
if (write_file_addr && write_file_len)
{
if ((error = kern_write_file(ref, write_file_offset, write_file_addr, write_file_len, 0))) 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_data_alloc);
VATTR_WANTED(&va, va_nlink);
error = EFAULT;
if (vnode_getattr(ref->vp, &va, ref->ctx)) goto out;
mpFree = freespace_mb(ref->vp);
mpFree <<= 20;
kprintf("kern_direct_file(%s): vp size %qd, alloc %qd, mp free %qd, keep free %qd\n",
name, va.va_data_size, va.va_data_alloc, mpFree, fs_free_size);
if (ref->vp->v_type == VREG)
{
if (va.va_nlink != 1) goto out;
device = va.va_fsid;
ref->filelength = va.va_data_size;
p1 = &device;
p2 = p;
do_ioctl = &file_ioctl;
if (set_file_size)
{
if (fs_free_size)
{
mpFree += va.va_data_alloc;
if ((mpFree < set_file_size) || ((mpFree - set_file_size) < fs_free_size))
{
error = ENOSPC;
goto out;
}
}
error = vnode_setsize(ref->vp, set_file_size, IO_NOZEROFILL | IO_NOAUTH, ref->ctx);
if (error) goto out;
ref->filelength = set_file_size;
}
}
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;
}
ref->device = device;
dk_corestorage_info_t cs_info;
memset(&cs_info, 0, sizeof(dk_corestorage_info_t));
error = do_ioctl(p1, p2, DKIOCCORESTORAGE, (caddr_t)&cs_info);
ref->cf = (error == 0) && (cs_info.flags & DK_CORESTORAGE_ENABLE_HOTFILES);
error = do_ioctl(p1, p2, DKIOCGETBLOCKSIZE, (caddr_t) &ref->blksize);
if (error)
goto out;
if (ref->vp->v_type != VREG)
{
error = do_ioctl(p1, p2, DKIOCGETBLOCKCOUNT, (caddr_t) &fileblk);
if (error) goto out;
ref->filelength = fileblk * ref->blksize;
}
error = kern_ioctl_file_extents(ref, _DKIOCCSPINEXTENT, 0, ref->filelength);
if (error && (ENOTTY != error)) goto out;
ref->pinned = (error == 0);
error = do_ioctl(p1, p2, DKIOCLOCKPHYSICALEXTENTS, NULL);
if (error) goto out;
locked = TRUE;
f_offset = 0;
while (f_offset < ref->filelength)
{
if (ref->vp->v_type == VREG)
{
filechunk = 1*1024*1024*1024;
daddr64_t blkno;
error = VNOP_BLOCKMAP(ref->vp, f_offset, filechunk, &blkno,
&filechunk, NULL, VNODE_WRITE, NULL);
if (error) goto out;
fileblk = blkno * ref->blksize;
}
else if ((ref->vp->v_type == VBLK) || (ref->vp->v_type == VCHR))
{
fileblk = f_offset;
filechunk = f_offset ? 0 : ref->filelength;
}
physoffset = 0;
while (physoffset < filechunk)
{
dk_physical_extent_t getphysreq;
bzero(&getphysreq, sizeof(getphysreq));
getphysreq.offset = fileblk + physoffset;
getphysreq.length = (filechunk - physoffset);
error = do_ioctl(p1, p2, DKIOCGETPHYSICALEXTENT, (caddr_t) &getphysreq);
if (error) goto out;
if (!target)
{
target = getphysreq.dev;
}
else if (target != getphysreq.dev)
{
error = ENOTSUP;
goto out;
}
#if HIBFRAGMENT
uint64_t rev;
for (rev = 4096; rev <= getphysreq.length; rev += 4096)
{
callback(callback_ref, getphysreq.offset + getphysreq.length - rev, 4096);
}
#else
callback(callback_ref, getphysreq.offset, getphysreq.length);
#endif
physoffset += getphysreq.length;
}
f_offset += filechunk;
}
callback(callback_ref, 0ULL, 0ULL);
if (ref->vp->v_type == VREG) p1 = ⌖
else
{
p1 = ⌖
p2 = p;
do_ioctl = &file_ioctl;
}
if (partitionbase_result)
{
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)
error = do_ioctl(p1, p2, DKIOCGETMAXSEGMENTCOUNTREAD, (caddr_t) &segcount);
if (error)
count = segcount = 0;
count *= segcount;
if (count && (count < maxiocount))
maxiocount = count;
error = do_ioctl(p1, p2, DKIOCGETMAXSEGMENTBYTECOUNTWRITE, (caddr_t) &count);
if (!error)
error = do_ioctl(p1, p2, DKIOCGETMAXSEGMENTCOUNTWRITE, (caddr_t) &segcount);
if (error)
count = segcount = 0;
count *= segcount;
if (count && (count < maxiocount))
maxiocount = count;
kprintf("max io 0x%qx bytes\n", maxiocount);
if (maxiocount_result)
*maxiocount_result = maxiocount;
error = do_ioctl(p1, p2, DKIOCISSOLIDSTATE, (caddr_t)&isssd);
if (!error && isssd)
flags |= kIOPolledFileSSD;
if (partition_device_result)
*partition_device_result = device;
if (image_device_result)
*image_device_result = target;
if (oflags)
*oflags = flags;
if ((ref->vp->v_type == VBLK) || (ref->vp->v_type == VCHR))
{
vnode_close(ref->vp, FWRITE, ref->ctx);
ref->vp = NULLVP;
vfs_context_rele(ref->ctx);
ref->ctx = NULL;
}
out:
printf("kern_open_file_for_direct_io(%d)\n", error);
if (error && locked)
{
p1 = &device;
(void) do_ioctl(p1, p2, DKIOCUNLOCKPHYSICALEXTENTS, NULL);
}
if (error && ref)
{
if (ref->vp)
{
(void) kern_ioctl_file_extents(ref, _DKIOCCSUNPINEXTENT, 0, (ref->pinned && ref->cf) ? ref->filelength : 0);
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, void * addr, size_t len, int ioflag)
{
return (vn_rdwr(UIO_WRITE, ref->vp,
addr, len, offset,
UIO_SYSSPACE, ioflag|IO_SYNC|IO_NODELOCKED|IO_UNIT,
vfs_context_ucred(ref->ctx), (int *) 0,
vfs_context_proc(ref->ctx)));
}
int
kern_read_file(struct kern_direct_file_io_ref_t * ref, off_t offset, void * addr, size_t len, int ioflag)
{
return (vn_rdwr(UIO_READ, ref->vp,
addr, len, offset,
UIO_SYSSPACE, ioflag|IO_SYNC|IO_NODELOCKED|IO_UNIT,
vfs_context_ucred(ref->ctx), (int *) 0,
vfs_context_proc(ref->ctx)));
}
struct mount *
kern_file_mount(struct kern_direct_file_io_ref_t * ref)
{
return (ref->vp->v_mount);
}
void
kern_close_file_for_direct_io(struct kern_direct_file_io_ref_t * ref,
off_t write_offset, void * addr, size_t write_length,
off_t discard_offset, off_t discard_end)
{
int error;
kprintf("kern_close_file_for_direct_io\n");
if (!ref) return;
if (ref->vp)
{
int (*do_ioctl)(void * p1, void * p2, u_long theIoctl, caddr_t result);
void * p1;
void * p2;
if (ref->vp->v_type == VREG)
{
p1 = &ref->device;
p2 = kernproc;
do_ioctl = &file_ioctl;
}
else
{
p1 = ref->vp;
p2 = ref->ctx;
do_ioctl = &device_ioctl;
}
(void) do_ioctl(p1, p2, DKIOCUNLOCKPHYSICALEXTENTS, NULL);
boolean_t will_unmap = (!ref->pinned || ref->cf) && (discard_end > discard_offset);
boolean_t will_unpin = (ref->pinned && ref->cf );
(void) kern_ioctl_file_extents(ref, _DKIOCCSUNPINEXTENT, 0, (will_unpin) ? ref->filelength : 0);
if (will_unmap)
{
(void) kern_ioctl_file_extents(ref, DKIOCUNMAP, discard_offset, (ref->cf) ? ref->filelength : discard_end);
}
if (addr && write_length)
{
(void) kern_write_file(ref, write_offset, addr, write_length, 0);
}
error = vnode_close(ref->vp, FWRITE, ref->ctx);
ref->vp = NULLVP;
kprintf("vnode_close(%d)\n", error);
}
if (ref->ctx)
{
vfs_context_rele(ref->ctx);
ref->ctx = NULL;
}
kfree(ref, sizeof(struct kern_direct_file_io_ref_t));
}