xnu-2782.30.5.tar.gz

[apple/xnu.git] / bsd / kern / kern_symfile.c

diff --git a/bsd/kern/kern_symfile.c b/bsd/kern/kern_symfile.c
index f4607b9d3aa85078766c1787689b09a2f33cceeb..0e9d6c9c67bbcd20307e88a0e6fd6087f0af8ba4 100644 (file)
--- a/bsd/kern/kern_symfile.c
+++ b/bsd/kern/kern_symfile.c
@@ -1,43 +1,35 @@
 /*
 /*

- * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2006 Apple Computer, Inc. All rights reserved.

  *
  *

- * @APPLE_LICENSE_HEADER_START@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@

  * 
  * 

- * The contents of this file constitute Original Code as defined in and
- * are subject to the Apple Public Source License Version 1.1 (the
- * "License").  You may not use this file except in compliance with the
- * License.  Please obtain a copy of the License at
- * http://www.apple.com/publicsource and read it before using this file.
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.

  * 
  * 

- * This Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
+ * 
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER

  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,

- * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
- * License for the specific language governing rights and limitations
- * under the License.
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.

  * 
  * 

- * @APPLE_LICENSE_HEADER_END@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@

  */
 /* Copyright (c) 1998 Apple Computer, Inc.  All rights reserved.
  *
  *     File:   bsd/kern/kern_symfile.c
  *
  */
 /* Copyright (c) 1998 Apple Computer, Inc.  All rights reserved.
  *
  *     File:   bsd/kern/kern_symfile.c
  *

- *     This file contains creates a dummy symbol file for mach_kernel based on
- *      the symbol table information passed by the SecondaryLoader/PlatformExpert.
- *      This allows us to correctly link other executables (drivers, etc) against the 
- *      the kernel in cases where the kernel image on the root device does not match
- *      the live kernel. This can occur during net-booting where the actual kernel
- *      image is obtained from the network via tftp rather than the root
- *      device.
- *
- *      If a symbol table is available, then the file /mach.sym will be created
- *      containing a Mach Header and a LC_SYMTAB load command followed by the
- *      the symbol table data for mach_kernel.
- *

  * HISTORY
  * HISTORY

- * 
- *     .

  */
 
 #include <mach/vm_param.h>
  */
 
 #include <mach/vm_param.h>


@@ -47,290 +39,521 @@
 #include <sys/signalvar.h>
 #include <sys/resourcevar.h>
 #include <sys/namei.h>
 #include <sys/signalvar.h>
 #include <sys/resourcevar.h>
 #include <sys/namei.h>

-#include <sys/vnode.h>
-#include <sys/proc.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/timeb.h>
 #include <sys/times.h>

-#include <sys/buf.h>

 #include <sys/acct.h>
 #include <sys/acct.h>

-#include <sys/file.h>
+#include <sys/file_internal.h>

 #include <sys/uio.h>
 #include <sys/kernel.h>
 #include <sys/stat.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 <mach-o/loader.h>
 #include <mach-o/nlist.h>
 

+#include <kern/kalloc.h>

 #include <vm/vm_kern.h>
 #include <vm/vm_kern.h>

+#include <pexpert/pexpert.h>
+#include <IOKit/IOHibernatePrivate.h>

 
 

-extern unsigned char   rootdevice[];
-extern struct mach_header _mh_execute_header;
+/* This function is called from kern_sysctl in the current process context;
+ * it is exported with the System6.0.exports, but this appears to be a legacy
+ * export, as there are no internal consumers.
+ */
+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;
+}

 
 

-static int kernel_symfile_opened = 0;
-static int error_code = 0;
+struct kern_direct_file_io_ref_t
+{
+    vfs_context_t  ctx;
+    struct vnode * vp;
+    dev_t          device;
+    uint32_t      blksize;
+    off_t          filelength;
+    char           pinned;
+};

 
 

-extern int  IODTGetLoaderInfo(char *key, void **infoAddr, int *infoSize);
-extern void IODTFreeLoaderInfo(char *key, void *infoAddr, int infoSize);

 
 

-/*
- * 
- */
-static int output_kernel_symbols(struct proc *p)
+static int file_ioctl(void * p1, void * p2, u_long theIoctl, caddr_t result)

 {
 {

-    struct vnode               *vp;
-    struct pcred               *pcred = p->p_cred;
-    struct ucred               *cred = pcred->pc_ucred;
-    struct nameidata           nd;
-    struct vattr               vattr;
-    struct load_command                *cmd;
-    struct mach_header         *orig_mh, *mh;
-    struct segment_command     *orig_ds, *orig_ts, *orig_le, *sg;
-    struct section             *se, *const_text;
-    struct symtab_command      *st, *orig_st;
-    struct nlist               *sym;
-    vm_size_t                  orig_mhsize, orig_st_size;
-    vm_offset_t                        header;
-    vm_size_t                  header_size;
-    int                                error, error1;
-    int                                i, j;
-    caddr_t                    addr;
-    vm_offset_t                        offset;
-    int                                rc_mh, rc_sc;
+    dev_t device = *(dev_t*) p1;

 
 

-    error = EFAULT;
+    return ((*bdevsw[major(device)].d_ioctl)
+                   (device, theIoctl, result, S_IFBLK, p2));
+}

 
 

-    vp         = NULL;
-    header     = NULL;
-    orig_mh    = NULL;
-    orig_st    = NULL;
-    
-    // Dispose of unnecessary gumf, the booter doesn't need to load these
-    rc_mh = IODTGetLoaderInfo("Kernel-__HEADER",
-                               (void **)&orig_mh, &orig_mhsize);
-    if (rc_mh && orig_mh)
-       IODTFreeLoaderInfo("Kernel-__HEADER",
-                           (void *)orig_mh, round_page(orig_mhsize));
-
-    rc_sc = IODTGetLoaderInfo("Kernel-__SYMTAB",
-                               (void **) &orig_st, &orig_st_size);
-    if (rc_sc && orig_st)
-       IODTFreeLoaderInfo("Kernel-__SYMTAB",
-                           (void *)orig_st, round_page(orig_st_size));
-
-    if (pcred->p_svuid != pcred->p_ruid || pcred->p_svgid != pcred->p_rgid)
-       goto out;
-
-    // Check to see if the root is 'e' or 'n', is this a test for network?
-    if (rootdevice[0] == 'e' && rootdevice[1] == 'n')
-       goto out;
-
-    NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, "mach.sym", p);
-    if((error = vn_open(&nd, O_CREAT | FWRITE, S_IRUSR | S_IRGRP | S_IROTH))) goto out;
-
-    vp = nd.ni_vp;
-    
-    /* Don't dump to non-regular files or files with links. */
-    error = EFAULT;
-    if (vp->v_type != VREG || VOP_GETATTR(vp, &vattr, cred, p)
-    ||  vattr.va_nlink != 1)
-       goto out;
-
-    VATTR_NULL(&vattr);
-    vattr.va_size = 0;
-    VOP_LEASE(vp, p, cred, LEASE_WRITE);
-    VOP_SETATTR(vp, &vattr, cred, p);
-    p->p_acflag |= ACORE;
-
-    // If the file type is MH_EXECUTE then this must be a kernel
-    // as all Kernel extensions must be of type MH_OBJECT
-    orig_ds = orig_ts = orig_le = NULL;
-    orig_st = NULL;
-    orig_mh = &_mh_execute_header;
-    cmd = (struct load_command *) &orig_mh[1];
-    for (i = 0; i < orig_mh->ncmds; i++) {
-       if (cmd->cmd == LC_SEGMENT) {
-           struct segment_command *sg = (struct segment_command *) cmd;
-    
-           if (!strcmp(SEG_TEXT, sg->segname))
-               orig_ts = sg;
-           else if (!strcmp(SEG_DATA, sg->segname))
-               orig_ds = sg;
-           else if (!strcmp(SEG_LINKEDIT, sg->segname))
-               orig_le = sg;
+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;
+    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
+    {
+       /* Partition. */
+       p1 = ref->vp;
+       p2 = ref->ctx;
+       do_ioctl = &device_ioctl;
+    }
+    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);
+//         printf("DKIOCUNMAP(%d) 0x%qx, 0x%qx\n", error, extent.offset, extent.length);
+       }
+       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 (cmd->cmd == LC_SYMTAB)
-           orig_st = (struct symtab_command *) cmd;
-    
-       cmd = (struct load_command *) ((caddr_t) cmd + cmd->cmdsize);
+       else error = EINVAL;
+
+       if (error) break;
+        offset += filechunk;

     }
     }

+    return (error);
+}

 
 

-    if (!orig_ts || !orig_ds || !orig_le || !orig_st) 
-       goto out;

 
 

-    const_text = NULL;
-    se = (struct section *) &orig_ts[1];
-    for (i = 0; i < orig_ts->nsects; i++, se++) {
-       if (!strcmp("__const", se->sectname)) {
-           const_text = se;
-           break;
-       }
+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 write_file_offset,
+                             caddr_t write_file_addr,
+                             vm_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 (*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_current());
+
+    if ((error = vnode_open(name, (create_file) ? (O_CREAT | FWRITE) : FWRITE, 
+                            (0), 0, &ref->vp, ref->ctx)))
+        goto out;
+
+    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;
+
+    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 alloc %qd\n", va.va_data_size, va.va_data_alloc);
+
+    if (ref->vp->v_type == VREG)
+    {
+               /* Don't dump files with links. */
+               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)
+           {
+                       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))
+    {
+       /* Partition. */
+        device = va.va_rdev;
+
+        p1 = ref->vp;
+        p2 = ref->ctx;
+        do_ioctl = &device_ioctl;

     }
     }

-    if (!const_text)
-       goto out;
-
-    header_size =   sizeof(struct mach_header) 
-                   + orig_ts->cmdsize
-                   + orig_ds->cmdsize
-                   + sizeof(struct symtab_command);
-
-    (void) kmem_alloc_wired(kernel_map,
-                           (vm_offset_t *) &header,
-                           (vm_size_t) header_size);
-    if (header)
-       bzero((void *) header, header_size);

     else
     else

-       goto out;
-
-    /*
-     * Set up Mach-O header.
-     */
-    mh = (struct mach_header *) header;
-    mh->magic      = orig_mh->magic;
-    mh->cputype    = orig_mh->cputype;
-    mh->cpusubtype = orig_mh->cpusubtype;
-    mh->filetype   = orig_mh->filetype;
-    mh->ncmds      = 3;
-    mh->sizeofcmds = header_size - sizeof(struct mach_header);
-    mh->flags      = orig_mh->flags;
-
-    // Initialise the current file offset and addr
-    offset = round_page(header_size);
-    addr = (caddr_t) const_text->addr; // Load address of __TEXT,__const
-
-    /*
-     * Construct a TEXT segment load command
-     * the only part of the TEXT segment we keep is the __TEXT,__const
-     * which contains the kernel vtables. 
-     */
-    sg = (struct segment_command *) &mh[1];
-    bcopy(orig_ts, sg, orig_ts->cmdsize);
-    sg->vmaddr   = (unsigned long) addr;
-    sg->vmsize   = const_text->size;
-    sg->fileoff  = 0;
-    sg->filesize = const_text->size + round_page(header_size);
-    sg->maxprot  = 0;
-    sg->initprot = 0;
-    sg->flags    = 0;
-    se = (struct section *)(sg+1);
-    for ( j = 0; j < sg->nsects; j++, se++ ) {
-       se->addr  = (unsigned long) addr;
-       se->size  = 0;
-       se->offset = offset;
-       se->nreloc = 0;
-       if (!strcmp("__const", se->sectname)) {
-           se->size = const_text->size;
-           addr    += const_text->size;
-           offset  += const_text->size;
-           const_text = se;
-       }
+    {
+       /* Don't dump to non-regular files. */
+       error = EFAULT;
+        goto out;

     }
     }

-    offset = round_page((vm_address_t) offset);
-
-    // Now copy of the __DATA segment load command, the image need
-    // not be stored to disk nobody needs it, yet!
-    sg = (struct segment_command *)((int)sg + sg->cmdsize);
-    bcopy(orig_ds, sg, orig_ds->cmdsize);
-
-    sg->vmaddr   = (unsigned long) addr;
-    sg->vmsize   = 0x1000;     // One page for some reason?
-    sg->fileoff  = offset;
-    sg->filesize = 0;
-    sg->maxprot  = 0;
-    sg->initprot = 0;
-    sg->flags    = 0;
-    se = (struct section *)(sg+1);
-    for ( j = 0; j < sg->nsects; j++, se++ ) {
-       se->addr  = (unsigned long) addr;
-       se->size  = 0;
-       se->offset = offset;
-       se->nreloc = 0;
+    ref->device = device;
+
+    // get block size
+
+    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;    

     }
     }

-    offset = round_page(offset);
-
-
-    /*
-     * Set up LC_SYMTAB command
-     */
-    st          = (struct symtab_command *)((int)sg + sg->cmdsize);
-    st->cmd     = LC_SYMTAB;
-    st->cmdsize = sizeof(struct symtab_command);
-    st->symoff  = offset;
-    st->nsyms   = orig_st->nsyms;
-    st->strsize = orig_st->strsize;
-    st->stroff =  offset + st->nsyms * sizeof(struct nlist);    
-
-    /*
-     * Convert the symbol table in place from section references
-     * to absolute references.
-     */
-    sym = (struct nlist *) orig_le->vmaddr;
-    for (i = 0; i < st->nsyms; i++, sym++ ) {
-       if ( (sym->n_type & N_TYPE) == N_SECT) {
-           sym->n_sect = NO_SECT;
-           sym->n_type = (sym->n_type & ~N_TYPE) | N_ABS;
-       }
+
+    // pin logical extents
+
+    error = kern_ioctl_file_extents(ref, _DKIOCCSPINEXTENT, 0, ref->filelength);
+    if (error && (ENOTTY != error)) goto out;
+    ref->pinned = (error == 0);
+
+    // generate the block list
+
+    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);

 
 

-    /*
-     * Write out the load commands at the beginning of the file.
-     */
-    error = vn_rdwr(UIO_WRITE, vp, (caddr_t) mh, header_size, (off_t) 0,
-                   UIO_SYSSPACE, IO_NODELOCKED|IO_UNIT, cred, (int *) 0, p);
+    if (ref->vp->v_type == VREG)
+        p1 = &target;
+
+    // get partition base
+
+    if (partitionbase_result) 
+    {
+        error = do_ioctl(p1, p2, DKIOCGETBASE, (caddr_t) partitionbase_result);
+        if (error)
+            goto out;
+    }
+
+    // get block size & constraints
+
+    error = do_ioctl(p1, p2, DKIOCGETBLOCKSIZE, (caddr_t) &blksize);

     if (error)
     if (error)

-       goto out;
-
-    /*
-     * Write out the __TEXT,__const data segment.
-     */
-    error = vn_rdwr(UIO_WRITE, vp, (caddr_t) const_text->addr,
-                   const_text->size, const_text->offset,
-                   UIO_SYSSPACE, IO_NODELOCKED|IO_UNIT, cred, (int *) 0, p);
+        goto out;
+
+    maxiocount = 1*1024*1024*1024;
+
+    error = do_ioctl(p1, p2, DKIOCGETMAXBLOCKCOUNTREAD, (caddr_t) &count);

     if (error)
     if (error)

-       goto out;
-
-    /*
-     *         Write out kernel symbols
-     */
-    offset = st->nsyms * sizeof(struct nlist) + st->strsize;   // symtab size
-    error = vn_rdwr(UIO_WRITE, vp,
-                  (caddr_t) orig_le->vmaddr, offset, st->symoff,
-                   UIO_SYSSPACE, IO_NODELOCKED|IO_UNIT, cred, (int *) 0, p);
+        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)
     if (error)

-       goto out;
+        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 |= kIOHibernateOptionSSD;
+
+    if (partition_device_result)
+        *partition_device_result = device;
+    if (image_device_result)
+        *image_device_result = target;
+    if (oflags)
+        *oflags = flags;

 
 out:
 
 out:

-    if (header)
-       kmem_free(kernel_map, header, header_size);
+    kprintf("kern_open_file_for_direct_io(%d)\n", error);

 
 

-    if (vp) {
-       VOP_UNLOCK(vp, 0, p);
-       error1 = vn_close(vp, FWRITE, cred, p);
-       if (!error) error = error1;
+    if (error && locked)
+    {
+        p1 = &device;
+        (void) do_ioctl(p1, p2, DKIOCUNLOCKPHYSICALEXTENTS, NULL);
+    }
+
+    if (error && ref)
+    {
+    if (ref->pinned)
+    {
+        _dk_cs_pin_t pin;
+        bzero(&pin, sizeof(pin));
+
+           pin.cp_flags = _DKIOCCSPINDISCARDBLACKLIST;
+        p1 = &device;
+        (void) do_ioctl(p1, p2, _DKIOCCSUNPINEXTENT, (caddr_t)&pin);
+    }
+       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(error);
+    return(ref);

 }
 }

-/*
- * 
- */
-int get_kernel_symfile(struct proc *p, char **symfile)
+
+int
+kern_write_file(struct kern_direct_file_io_ref_t * ref, off_t offset, caddr_t addr, vm_size_t len, int ioflag)

 {
 {

-    if (!kernel_symfile_opened) {
-        kernel_symfile_opened = 1;
-        error_code = output_kernel_symbols(p);
-    }
-    if (!error_code)
-       *symfile = "\\mach.sym";
+    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)));
+}
+

 
 

-    return error_code;
+void
+kern_close_file_for_direct_io(struct kern_direct_file_io_ref_t * ref,
+                             off_t write_offset, caddr_t addr, vm_size_t write_length,
+                             off_t discard_offset, off_t discard_end)
+{
+    int error;
+    _dk_cs_pin_t pin;
+    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
+        {
+            /* Partition. */
+            p1 = ref->vp;
+            p2 = ref->ctx;
+            do_ioctl = &device_ioctl;
+        }
+        (void) do_ioctl(p1, p2, DKIOCUNLOCKPHYSICALEXTENTS, NULL);
+
+        if (ref->pinned)
+        {
+            bzero(&pin, sizeof(pin));
+            pin.cp_flags = _DKIOCCSPINDISCARDBLACKLIST;
+            (void) do_ioctl(p1, p2, _DKIOCCSUNPINEXTENT, (caddr_t)&pin);
+        }
+
+        
+        if (discard_offset && discard_end && !ref->pinned)
+        {
+            (void) kern_ioctl_file_extents(ref, DKIOCUNMAP, discard_offset, 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);
+    }
+    vfs_context_rele(ref->ctx);
+    ref->ctx = NULL;
+    kfree(ref, sizeof(struct kern_direct_file_io_ref_t));

 }
 }