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

/*
 * Copyright (c) 2000-2006 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 * 
 * 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.
 * 
 * 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,
 * 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_OSREFERENCE_LICENSE_HEADER_END@
 */
/* Copyright (c) 1998 Apple Computer, Inc.  All rights reserved.
 *
 *	File:	bsd/kern/kern_symfile.c
 *
 * HISTORY
 */

#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>

/* 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)
{
    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();		// kernproc;
    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)
    {
	/* Don't dump files with links. */
	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))
    {
	/* Partition. */
        device = va.va_rdev;

        p1 = ref->vp;
        p2 = ref->ctx;
        do_ioctl = &device_ioctl;
    }
    else
    {
	/* Don't dump to non-regular files. */
	error = EFAULT;
        goto out;
    }

    // get partition base

    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)
        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;

    // generate the block list

    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));
    }
}
Commit	Line	Data
1c79356b	1	/*
2d21ac55	2	* Copyright (c) 2000-2006 Apple Computer, Inc. All rights reserved.
5d5c5d0d	3	*
2d21ac55	4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
1c79356b	5	*
2d21ac55 A	6	* This file contains Original Code and/or Modifications of Original Code
	7	* as defined in and that are subject to the Apple Public Source License
	8	* Version 2.0 (the 'License'). You may not use this file except in
	9	* compliance with the License. The rights granted to you under the License
	10	* may not be used to create, or enable the creation or redistribution of,
	11	* unlawful or unlicensed copies of an Apple operating system, or to
	12	* circumvent, violate, or enable the circumvention or violation of, any
	13	* terms of an Apple operating system software license agreement.
8f6c56a5	14	*
2d21ac55 A	15	* Please obtain a copy of the License at
	16	* http://www.opensource.apple.com/apsl/ and read it before using this file.
	17	*
	18	* The Original Code and all software distributed under the License are
	19	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
8f6c56a5 A	20	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
8f6c56a5 A	21	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
2d21ac55 A	22	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	23	* Please see the License for the specific language governing rights and
	24	* limitations under the License.
8f6c56a5	25	*
2d21ac55	26	* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
1c79356b A	27	*/
	28	/* Copyright (c) 1998 Apple Computer, Inc. All rights reserved.
	29	*
	30	* File: bsd/kern/kern_symfile.c
	31	*
1c79356b	32	* HISTORY
1c79356b A	33	*/
	34
	35	#include <mach/vm_param.h>
	36
	37	#include <sys/param.h>
	38	#include <sys/systm.h>
	39	#include <sys/signalvar.h>
	40	#include <sys/resourcevar.h>
	41	#include <sys/namei.h>
91447636 A	42	#include <sys/vnode_internal.h>
	43	#include <sys/proc_internal.h>
	44	#include <sys/kauth.h>
1c79356b A	45	#include <sys/timeb.h>
1c79356b A	46	#include <sys/times.h>
1c79356b	47	#include <sys/acct.h>
91447636	48	#include <sys/file_internal.h>
1c79356b A	49	#include <sys/uio.h>
	50	#include <sys/kernel.h>
	51	#include <sys/stat.h>
91447636 A	52	#include <sys/disk.h>
91447636 A	53	#include <sys/conf.h>
1c79356b A	54
	55	#include <mach-o/loader.h>
	56	#include <mach-o/nlist.h>
	57
91447636	58	#include <kern/kalloc.h>
1c79356b	59	#include <vm/vm_kern.h>
91447636	60	#include <pexpert/pexpert.h>
3a60a9f5	61	#include <IOKit/IOHibernatePrivate.h>
1c79356b	62
2d21ac55 A	63	/* This function is called from kern_sysctl in the current process context;
	64	* it is exported with the System6.0.exports, but this appears to be a legacy
	65	* export, as there are no internal consumers.
1c79356b	66	*/
2d21ac55 A	67	int
2d21ac55 A	68	get_kernel_symfile(__unused proc_t p, __unused char const **symfile)
1c79356b	69	{
2d21ac55	70	return KERN_FAILURE;
0b4e3aa0	71	}
91447636	72
3a60a9f5 A	73	struct kern_direct_file_io_ref_t
3a60a9f5 A	74	{
2d21ac55	75	vfs_context_t ctx;
3a60a9f5 A	76	struct vnode *vp;
	77	};
	78
	79
	80	static int file_ioctl(void * p1, void * p2, int theIoctl, caddr_t result)
	81	{
	82	dev_t device = (dev_t) p1;
	83
	84	return ((*bdevsw[major(device)].d_ioctl)
	85	(device, theIoctl, result, S_IFBLK, p2));
	86	}
	87
	88	static int device_ioctl(void * p1, __unused void * p2, int theIoctl, caddr_t result)
	89	{
	90	return (VNOP_IOCTL(p1, theIoctl, result, 0, p2));
	91	}
	92
	93	struct kern_direct_file_io_ref_t *
	94	kern_open_file_for_direct_io(const char * name,
	95	kern_get_file_extents_callback_t callback,
	96	void * callback_ref,
	97	dev_t * device_result,
	98	uint64_t * partitionbase_result,
	99	uint64_t * maxiocount_result)
	100	{
	101	struct kern_direct_file_io_ref_t * ref;
	102
2d21ac55	103	proc_t p;
3a60a9f5 A	104	struct vnode_attr va;
	105	int error;
	106	off_t f_offset;
	107	uint32_t blksize;
	108	uint64_t size;
	109	dev_t device;
	110	off_t maxiocount, count;
	111
	112	int (do_ioctl)(void p1, void * p2, int theIoctl, caddr_t result);
	113	void * p1;
	114	void * p2;
	115
	116	error = EFAULT;
	117
	118	ref = (struct kern_direct_file_io_ref_t *) kalloc(sizeof(struct kern_direct_file_io_ref_t));
	119	if (!ref)
	120	{
	121	error = EFAULT;
	122	goto out;
	123	}
	124
	125	ref->vp = NULL;
	126	p = current_proc(); // kernproc;
2d21ac55	127	ref->ctx = vfs_context_create(vfs_context_current());
3a60a9f5	128
2d21ac55	129	if ((error = vnode_open(name, (O_CREAT \| FWRITE), (0), 0, &ref->vp, ref->ctx)))
3a60a9f5 A	130	goto out;
	131
	132	VATTR_INIT(&va);
	133	VATTR_WANTED(&va, va_rdev);
	134	VATTR_WANTED(&va, va_fsid);
	135	VATTR_WANTED(&va, va_data_size);
	136	VATTR_WANTED(&va, va_nlink);
	137	error = EFAULT;
2d21ac55	138	if (vnode_getattr(ref->vp, &va, ref->ctx))
3a60a9f5 A	139	goto out;
	140
	141	kprintf("vp va_rdev major %d minor %d\n", major(va.va_rdev), minor(va.va_rdev));
	142	kprintf("vp va_fsid major %d minor %d\n", major(va.va_fsid), minor(va.va_fsid));
	143	kprintf("vp size %qd\n", va.va_data_size);
	144
	145	if (ref->vp->v_type == VREG)
	146	{
	147	/* Don't dump files with links. */
	148	if (va.va_nlink != 1)
	149	goto out;
	150
	151	device = va.va_fsid;
	152	p1 = (void *) device;
	153	p2 = p;
	154	do_ioctl = &file_ioctl;
	155	}
	156	else if ((ref->vp->v_type == VBLK) \|\| (ref->vp->v_type == VCHR))
	157	{
	158	/* Partition. */
	159	device = va.va_rdev;
	160
	161	p1 = ref->vp;
2d21ac55	162	p2 = ref->ctx;
3a60a9f5 A	163	do_ioctl = &device_ioctl;
	164	}
	165	else
	166	{
	167	/* Don't dump to non-regular files. */
	168	error = EFAULT;
	169	goto out;
	170	}
	171
	172	// get partition base
	173
	174	error = do_ioctl(p1, p2, DKIOCGETBASE, (caddr_t) partitionbase_result);
	175	if (error)
	176	goto out;
	177
	178	// get block size & constraints
	179
	180	error = do_ioctl(p1, p2, DKIOCGETBLOCKSIZE, (caddr_t) &blksize);
	181	if (error)
	182	goto out;
	183
	184	maxiocount = 110241024*1024;
	185
	186	error = do_ioctl(p1, p2, DKIOCGETMAXBLOCKCOUNTREAD, (caddr_t) &count);
	187	if (error)
	188	count = 0;
	189	count *= blksize;
	190	if (count && (count < maxiocount))
	191	maxiocount = count;
	192
	193	error = do_ioctl(p1, p2, DKIOCGETMAXBLOCKCOUNTWRITE, (caddr_t) &count);
	194	if (error)
	195	count = 0;
	196	count *= blksize;
	197	if (count && (count < maxiocount))
	198	maxiocount = count;
	199
	200	error = do_ioctl(p1, p2, DKIOCGETMAXBYTECOUNTREAD, (caddr_t) &count);
	201	if (error)
	202	count = 0;
	203	if (count && (count < maxiocount))
	204	maxiocount = count;
	205
	206	error = do_ioctl(p1, p2, DKIOCGETMAXBYTECOUNTWRITE, (caddr_t) &count);
	207	if (error)
	208	count = 0;
	209	if (count && (count < maxiocount))
	210	maxiocount = count;
	211
	212	error = do_ioctl(p1, p2, DKIOCGETMAXSEGMENTBYTECOUNTREAD, (caddr_t) &count);
	213	if (error)
	214	count = 0;
	215	if (count && (count < maxiocount))
	216	maxiocount = count;
	217
	218	error = do_ioctl(p1, p2, DKIOCGETMAXSEGMENTBYTECOUNTWRITE, (caddr_t) &count);
	219	if (error)
	220	count = 0;
	221	if (count && (count < maxiocount))
	222	maxiocount = count;
	223
	224	kprintf("max io 0x%qx bytes\n", maxiocount);
	225	if (maxiocount_result)
	226	*maxiocount_result = maxiocount;
227
228	// generate the block list
229
230	error = 0;
231	if (ref->vp->v_type == VREG)
232	{
233	f_offset = 0;
234	while(f_offset < (off_t) va.va_data_size)
235	{
236	size_t io_size = 110241024*1024;
237	daddr64_t blkno;
238
239	error = VNOP_BLOCKMAP(ref->vp, f_offset, io_size, &blkno, (size_t *)&io_size, NULL, 0, NULL);
240	if (error)
241	goto out;
242	callback(callback_ref, ((uint64_t) blkno) * blksize, (uint64_t) io_size);
243	f_offset += io_size;
244	}
245	callback(callback_ref, 0ULL, 0ULL);
246	}
247	else if ((ref->vp->v_type == VBLK) \|\| (ref->vp->v_type == VCHR))
248	{
249	error = do_ioctl(p1, p2, DKIOCGETBLOCKCOUNT, (caddr_t) &size);
250	if (error)
251	goto out;
252	size *= blksize;
253	callback(callback_ref, 0ULL, size);
254	callback(callback_ref, size, 0ULL);
255	}
256
257	if (device_result)
258	*device_result = device;
259
260	out:
261	kprintf("kern_open_file_for_direct_io(%d)\n", error);
262
263	if (error && ref) {
2d21ac55 A	264	if (ref->vp) {
	265	vnode_close(ref->vp, FWRITE, ref->ctx);
	266	ref->vp = NULLVP;
	267	}
	268
	269	vfs_context_rele(ref->ctx);
	270	kfree(ref, sizeof(struct kern_direct_file_io_ref_t));
	271	ref = NULL;
3a60a9f5 A	272	}
	273
	274	return(ref);
	275	}
	276
	277	int
	278	kern_write_file(struct kern_direct_file_io_ref_t * ref, off_t offset, caddr_t addr, vm_size_t len)
	279	{
	280	return (vn_rdwr(UIO_WRITE, ref->vp,
	281	addr, len, offset,
	282	UIO_SYSSPACE32, IO_SYNC\|IO_NODELOCKED\|IO_UNIT,
2d21ac55 A	283	vfs_context_ucred(ref->ctx), (int *) 0,
2d21ac55 A	284	vfs_context_proc(ref->ctx)));
3a60a9f5 A	285	}
	286
	287	void
	288	kern_close_file_for_direct_io(struct kern_direct_file_io_ref_t * ref)
	289	{
	290	kprintf("kern_close_file_for_direct_io\n");
	291
	292	if (ref) {
	293	int error;
	294
	295	if (ref->vp) {
2d21ac55 A	296	error = vnode_close(ref->vp, FWRITE, ref->ctx);
2d21ac55 A	297	ref->vp = NULLVP;
3a60a9f5 A	298	kprintf("vnode_close(%d)\n", error);
3a60a9f5 A	299	}
2d21ac55 A	300	vfs_context_rele(ref->ctx);
2d21ac55 A	301	ref->ctx = NULL;
3a60a9f5 A	302	kfree(ref, sizeof(struct kern_direct_file_io_ref_t));
	303	}
	304	}
2d21ac55	305