[apple/xnu.git] / bsd / vm / vm_compressor_backing_file.c

/*
 * Copyright (c) 2000-2013 Apple 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@
 */

#include <stdint.h>
#include <sys/fcntl.h>
#include <sys/vnode_internal.h>
#include <sys/vnode.h>
#include <sys/kauth.h>
#include <sys/mount_internal.h>
#include <sys/buf_internal.h>
#include <kern/debug.h>
#include <kern/kalloc.h>
#include <sys/cprotect.h>
#include <sys/disk.h>
#include <vm/vm_protos.h>
#include <vm/vm_pageout.h>

void vm_swapfile_open(const char *path, vnode_t *vp);
void vm_swapfile_close(uint64_t path, vnode_t vp);
int vm_swapfile_preallocate(vnode_t vp, uint64_t *size);
uint64_t vm_swapfile_get_blksize(vnode_t vp);
uint64_t vm_swapfile_get_transfer_size(vnode_t vp);
int vm_swapfile_io(vnode_t vp, uint64_t offset, uint64_t start, int npages, int flags);

void
vm_swapfile_open(const char *path, vnode_t *vp)
{
	int error = 0;
	vfs_context_t	ctx = vfs_context_current();

	if ((error = vnode_open(path, (O_CREAT | O_TRUNC | FREAD | FWRITE), S_IRUSR | S_IWUSR, 0, vp, ctx))) {
		printf("Failed to open swap file %d\n", error);
		*vp = NULL;
		return;
	}	

	vnode_put(*vp);
}

uint64_t
vm_swapfile_get_blksize(vnode_t vp)
{
	return ((uint64_t)vfs_devblocksize(vnode_mount(vp)));
}

uint64_t
vm_swapfile_get_transfer_size(vnode_t vp)
{
	return((uint64_t)vp->v_mount->mnt_vfsstat.f_iosize);
}

int unlink1(vfs_context_t, struct nameidata *, int);

void
vm_swapfile_close(uint64_t path_addr, vnode_t vp)
{
	struct nameidata nd;
	vfs_context_t context = vfs_context_current();
	int error = 0;

	vnode_getwithref(vp);
	vnode_close(vp, 0, context);
	
	NDINIT(&nd, DELETE, OP_UNLINK, AUDITVNPATH1, UIO_SYSSPACE,
	       path_addr, context);

	error = unlink1(context, &nd, 0);
}

int
vm_swapfile_preallocate(vnode_t vp, uint64_t *size)
{
	int		error = 0;
	uint64_t	file_size = 0;
	vfs_context_t	ctx = NULL;


	ctx = vfs_context_current();

#if CONFIG_PROTECT
	{
#if 0	// <rdar://11771612>

		if ((error = cp_vnode_setclass(vp, PROTECTION_CLASS_F))) {
			if(config_protect_bug) {
				printf("swap protection class set failed with %d\n", error);
			} else {
				panic("swap protection class set failed with %d\n", error);
			}
		}
#endif
		/* initialize content protection keys manually */
		if ((error = cp_handle_vnop(vp, CP_WRITE_ACCESS, 0)) != 0) {
			printf("Content Protection key failure on swap: %d\n", error);
			vnode_put(vp);
			vp = NULL;
			goto done;
 		}
	}
#endif

	error = vnode_setsize(vp, *size, IO_NOZEROFILL, ctx);

	if (error) {
		printf("vnode_setsize for swap files failed: %d\n", error);
		goto done;
	}

	error = vnode_size(vp, (off_t*) &file_size, ctx);

	if (error) {
		printf("vnode_size (new file) for swap file failed: %d\n", error);
	}	

	assert(file_size == *size);
	
	vnode_lock_spin(vp);
	SET(vp->v_flag, VSWAP);
	vnode_unlock(vp);
done:
	return error;
}

int
vm_swapfile_io(vnode_t vp, uint64_t offset, uint64_t start, int npages, int flags)
{
	int error = 0;
	uint64_t io_size = npages * PAGE_SIZE_64;
#if 1
	kern_return_t	kr = KERN_SUCCESS;
	upl_t		upl = NULL;
	unsigned int	count = 0;
	int		upl_create_flags = 0, upl_control_flags = 0;
	upl_size_t	upl_size = 0;

	upl_create_flags = UPL_SET_INTERNAL | UPL_SET_LITE;

#if ENCRYPTED_SWAP
	upl_control_flags = UPL_IOSYNC | UPL_PAGING_ENCRYPTED;
#else
	upl_control_flags = UPL_IOSYNC;
#endif
	if ((flags & SWAP_READ) == FALSE) {
		upl_create_flags |= UPL_COPYOUT_FROM;
	}
 
	upl_size = io_size;
	kr = vm_map_create_upl( kernel_map,
				start,
				&upl_size,
				&upl,
				NULL,
				&count,
				&upl_create_flags);

	if (kr != KERN_SUCCESS || (upl_size != io_size)) {
		panic("vm_map_create_upl failed with %d\n", kr);
	}

	if (flags & SWAP_READ) {
		vnode_pagein(vp,
			      upl,
			      0,
			      offset,
			      io_size,
			      upl_control_flags | UPL_IGNORE_VALID_PAGE_CHECK,
			      &error);
		if (error) {
#if DEBUG
			printf("vm_swapfile_io: vnode_pagein failed with %d (vp: %p, offset: 0x%llx, size:%llu)\n", error, vp, offset, io_size);
#else /* DEBUG */
			printf("vm_swapfile_io: vnode_pagein failed with %d.\n", error);
#endif /* DEBUG */
		}
	
	} else {
		vnode_pageout(vp,
			      upl,
			      0,
			      offset,
			      io_size,
			      upl_control_flags,
			      &error);
		if (error) {
#if DEBUG
			printf("vm_swapfile_io: vnode_pageout failed with %d (vp: %p, offset: 0x%llx, size:%llu)\n", error, vp, offset, io_size);
#else /* DEBUG */
			printf("vm_swapfile_io: vnode_pageout failed with %d.\n", error);
#endif /* DEBUG */
		}
	}
	return error;

#else /* 1 */
	vfs_context_t ctx;
	ctx = vfs_context_kernel();
		
	error = vn_rdwr((flags & SWAP_READ) ? UIO_READ : UIO_WRITE, vp, (caddr_t)start, io_size, offset,
		UIO_SYSSPACE, IO_SYNC | IO_NODELOCKED | IO_UNIT | IO_NOCACHE | IO_SWAP_DISPATCH, vfs_context_ucred(ctx), (int *) 0, vfs_context_proc(ctx));

	if (error) {
		printf("vn_rdwr: Swap I/O failed with %d\n", error);
	}
	return error;
#endif /* 1 */
}


#define MAX_BATCH_TO_TRIM	256

#define ROUTE_ONLY		0x10		/* if corestorage is present, tell it to just pass */
                                                /* the DKIOUNMAP command through w/o acting on it */
                                                /* this is used by the compressed swap system to reclaim empty space */


u_int32_t vnode_trim_list (vnode_t vp, struct trim_list *tl, boolean_t route_only)
{
	int		error = 0;
	int		trim_index = 0;
	u_int32_t	blocksize = 0;
	struct vnode	*devvp;
	dk_extent_t	*extents;
	dk_unmap_t	unmap;
	_dk_cs_unmap_t	cs_unmap;

	if ( !(vp->v_mount->mnt_ioflags & MNT_IOFLAGS_UNMAP_SUPPORTED))
		return (ENOTSUP);

	if (tl == NULL)
		return (0);

	/*
	 * Get the underlying device vnode and physical block size
	 */
	devvp = vp->v_mount->mnt_devvp;
	blocksize = vp->v_mount->mnt_devblocksize;

	extents = kalloc(sizeof(dk_extent_t) * MAX_BATCH_TO_TRIM);

	if (vp->v_mount->mnt_ioflags & MNT_IOFLAGS_CSUNMAP_SUPPORTED) {
		memset (&cs_unmap, 0, sizeof(_dk_cs_unmap_t));
		cs_unmap.extents = extents;

		if (route_only == TRUE)
			cs_unmap.options = ROUTE_ONLY;
	} else {
		memset (&unmap, 0, sizeof(dk_unmap_t));
		unmap.extents = extents;
	}

	while (tl) {
		daddr64_t	io_blockno;	/* Block number corresponding to the start of the extent */
		size_t		io_bytecount;	/* Number of bytes in current extent for the specified range */
		size_t		trimmed;
		size_t		remaining_length;
		off_t		current_offset; 

		current_offset = tl->tl_offset;
		remaining_length = tl->tl_length;
		trimmed = 0;
		
		/* 
		 * We may not get the entire range from tl_offset -> tl_offset+tl_length in a single
		 * extent from the blockmap call.  Keep looping/going until we are sure we've hit
		 * the whole range or if we encounter an error.
		 */
		while (trimmed < tl->tl_length) {
			/*
			 * VNOP_BLOCKMAP will tell us the logical to physical block number mapping for the
			 * specified offset.  It returns blocks in contiguous chunks, so if the logical range is 
			 * broken into multiple extents, it must be called multiple times, increasing the offset
			 * in each call to ensure that the entire range is covered.
			 */
			error = VNOP_BLOCKMAP (vp, current_offset, remaining_length, 
					       &io_blockno, &io_bytecount, NULL, VNODE_READ, NULL);

			if (error) {
				goto trim_exit;
			}

			extents[trim_index].offset = (uint64_t) io_blockno * (u_int64_t) blocksize;
			extents[trim_index].length = io_bytecount;

			trim_index++;

			if (trim_index == MAX_BATCH_TO_TRIM) {

				if (vp->v_mount->mnt_ioflags & MNT_IOFLAGS_CSUNMAP_SUPPORTED) {
					cs_unmap.extentsCount = trim_index;
					error = VNOP_IOCTL(devvp, _DKIOCCSUNMAP, (caddr_t)&cs_unmap, 0, vfs_context_kernel());
				} else {
					unmap.extentsCount = trim_index;
					error = VNOP_IOCTL(devvp, DKIOCUNMAP, (caddr_t)&unmap, 0, vfs_context_kernel());
				}
				if (error) {
					goto trim_exit;
				}
				trim_index = 0;
			}
			trimmed += io_bytecount;
			current_offset += io_bytecount;
			remaining_length -= io_bytecount;
		}
		tl = tl->tl_next;
	}
	if (trim_index) {
		if (vp->v_mount->mnt_ioflags & MNT_IOFLAGS_CSUNMAP_SUPPORTED) {
			cs_unmap.extentsCount = trim_index;
			error = VNOP_IOCTL(devvp, _DKIOCCSUNMAP, (caddr_t)&cs_unmap, 0, vfs_context_kernel());
		} else {
			unmap.extentsCount = trim_index;
			error = VNOP_IOCTL(devvp, DKIOCUNMAP, (caddr_t)&unmap, 0, vfs_context_kernel());
		}
	}
trim_exit:
	kfree(extents, sizeof(dk_extent_t) * MAX_BATCH_TO_TRIM);

	return error;
}
Commit	Line	Data
39236c6e A	1	/*
	2	* Copyright (c) 2000-2013 Apple Inc. All rights reserved.
	3	*
	4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
	5	*
	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.
	14	*
	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
	20	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	21	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	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.
	25	*
	26	* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
	27	*/
	28
	29	#include <stdint.h>
	30	#include <sys/fcntl.h>
	31	#include <sys/vnode_internal.h>
	32	#include <sys/vnode.h>
	33	#include <sys/kauth.h>
	34	#include <sys/mount_internal.h>
	35	#include <sys/buf_internal.h>
	36	#include <kern/debug.h>
	37	#include <kern/kalloc.h>
	38	#include <sys/cprotect.h>
	39	#include <sys/disk.h>
	40	#include <vm/vm_protos.h>
	41	#include <vm/vm_pageout.h>
	42
	43	void vm_swapfile_open(const char path, vnode_t vp);
	44	void vm_swapfile_close(uint64_t path, vnode_t vp);
	45	int vm_swapfile_preallocate(vnode_t vp, uint64_t *size);
	46	uint64_t vm_swapfile_get_blksize(vnode_t vp);
	47	uint64_t vm_swapfile_get_transfer_size(vnode_t vp);
	48	int vm_swapfile_io(vnode_t vp, uint64_t offset, uint64_t start, int npages, int flags);
	49
	50	void
	51	vm_swapfile_open(const char path, vnode_t vp)
	52	{
	53	int error = 0;
	54	vfs_context_t ctx = vfs_context_current();
	55
fe8ab488	56	if ((error = vnode_open(path, (O_CREAT \| O_TRUNC \| FREAD \| FWRITE), S_IRUSR \| S_IWUSR, 0, vp, ctx))) {
39236c6e A	57	printf("Failed to open swap file %d\n", error);
	58	*vp = NULL;
	59	return;
	60	}
	61
	62	vnode_put(*vp);
	63	}
	64
	65	uint64_t
	66	vm_swapfile_get_blksize(vnode_t vp)
	67	{
	68	return ((uint64_t)vfs_devblocksize(vnode_mount(vp)));
	69	}
	70
	71	uint64_t
	72	vm_swapfile_get_transfer_size(vnode_t vp)
	73	{
	74	return((uint64_t)vp->v_mount->mnt_vfsstat.f_iosize);
	75	}
	76
	77	int unlink1(vfs_context_t, struct nameidata *, int);
	78
	79	void
	80	vm_swapfile_close(uint64_t path_addr, vnode_t vp)
	81	{
	82	struct nameidata nd;
	83	vfs_context_t context = vfs_context_current();
	84	int error = 0;
	85
	86	vnode_getwithref(vp);
	87	vnode_close(vp, 0, context);
	88
	89	NDINIT(&nd, DELETE, OP_UNLINK, AUDITVNPATH1, UIO_SYSSPACE,
	90	path_addr, context);
	91
	92	error = unlink1(context, &nd, 0);
	93	}
	94
	95	int
	96	vm_swapfile_preallocate(vnode_t vp, uint64_t *size)
	97	{
	98	int error = 0;
	99	uint64_t file_size = 0;
	100	vfs_context_t ctx = NULL;
	101
	102
	103	ctx = vfs_context_current();
	104
	105	#if CONFIG_PROTECT
	106	{
	107	#if 0 // <rdar://11771612>
	108
	109	if ((error = cp_vnode_setclass(vp, PROTECTION_CLASS_F))) {
	110	if(config_protect_bug) {
	111	printf("swap protection class set failed with %d\n", error);
	112	} else {
	113	panic("swap protection class set failed with %d\n", error);
	114	}
	115	}
	116	#endif
	117	/* initialize content protection keys manually */
	118	if ((error = cp_handle_vnop(vp, CP_WRITE_ACCESS, 0)) != 0) {
	119	printf("Content Protection key failure on swap: %d\n", error);
	120	vnode_put(vp);
121	vp = NULL;
122	goto done;
123	}
124	}
125	#endif
126
fe8ab488	127	error = vnode_setsize(vp, *size, IO_NOZEROFILL, ctx);
39236c6e	128
fe8ab488 A	129	if (error) {
fe8ab488 A	130	printf("vnode_setsize for swap files failed: %d\n", error);
39236c6e	131	goto done;
fe8ab488	132	}
39236c6e	133
fe8ab488	134	error = vnode_size(vp, (off_t*) &file_size, ctx);
39236c6e	135
fe8ab488 A	136	if (error) {
	137	printf("vnode_size (new file) for swap file failed: %d\n", error);
	138	}
39236c6e	139
fe8ab488 A	140	assert(file_size == *size);
fe8ab488 A	141
39236c6e A	142	vnode_lock_spin(vp);
	143	SET(vp->v_flag, VSWAP);
	144	vnode_unlock(vp);
	145	done:
	146	return error;
	147	}
	148
	149	int
	150	vm_swapfile_io(vnode_t vp, uint64_t offset, uint64_t start, int npages, int flags)
	151	{
	152	int error = 0;
	153	uint64_t io_size = npages * PAGE_SIZE_64;
	154	#if 1
	155	kern_return_t kr = KERN_SUCCESS;
	156	upl_t upl = NULL;
	157	unsigned int count = 0;
	158	int upl_create_flags = 0, upl_control_flags = 0;
	159	upl_size_t upl_size = 0;
	160
	161	upl_create_flags = UPL_SET_INTERNAL \| UPL_SET_LITE;
39236c6e	162
fe8ab488 A	163	#if ENCRYPTED_SWAP
	164	upl_control_flags = UPL_IOSYNC \| UPL_PAGING_ENCRYPTED;
	165	#else
	166	upl_control_flags = UPL_IOSYNC;
	167	#endif
39236c6e A	168	if ((flags & SWAP_READ) == FALSE) {
	169	upl_create_flags \|= UPL_COPYOUT_FROM;
	170	}
	171
	172	upl_size = io_size;
	173	kr = vm_map_create_upl( kernel_map,
	174	start,
	175	&upl_size,
	176	&upl,
	177	NULL,
	178	&count,
	179	&upl_create_flags);
	180
	181	if (kr != KERN_SUCCESS \|\| (upl_size != io_size)) {
	182	panic("vm_map_create_upl failed with %d\n", kr);
	183	}
	184
	185	if (flags & SWAP_READ) {
	186	vnode_pagein(vp,
	187	upl,
	188	0,
	189	offset,
	190	io_size,
	191	upl_control_flags \| UPL_IGNORE_VALID_PAGE_CHECK,
	192	&error);
	193	if (error) {
	194	#if DEBUG
	195	printf("vm_swapfile_io: vnode_pagein failed with %d (vp: %p, offset: 0x%llx, size:%llu)\n", error, vp, offset, io_size);
	196	#else /* DEBUG */
	197	printf("vm_swapfile_io: vnode_pagein failed with %d.\n", error);
	198	#endif /* DEBUG */
	199	}
	200
	201	} else {
	202	vnode_pageout(vp,
	203	upl,
	204	0,
	205	offset,
	206	io_size,
	207	upl_control_flags,
	208	&error);
	209	if (error) {
	210	#if DEBUG
	211	printf("vm_swapfile_io: vnode_pageout failed with %d (vp: %p, offset: 0x%llx, size:%llu)\n", error, vp, offset, io_size);
	212	#else /* DEBUG */
	213	printf("vm_swapfile_io: vnode_pageout failed with %d.\n", error);
	214	#endif /* DEBUG */
	215	}
	216	}
	217	return error;
	218
	219	#else /* 1 */
	220	vfs_context_t ctx;
	221	ctx = vfs_context_kernel();
	222
	223	error = vn_rdwr((flags & SWAP_READ) ? UIO_READ : UIO_WRITE, vp, (caddr_t)start, io_size, offset,
	224	UIO_SYSSPACE, IO_SYNC \| IO_NODELOCKED \| IO_UNIT \| IO_NOCACHE \| IO_SWAP_DISPATCH, vfs_context_ucred(ctx), (int *) 0, vfs_context_proc(ctx));
	225
	226	if (error) {
	227	printf("vn_rdwr: Swap I/O failed with %d\n", error);
	228	}
	229	return error;
	230	#endif /* 1 */
	231	}
232
233
234	#define MAX_BATCH_TO_TRIM 256
235
fe8ab488 A	236	#define ROUTE_ONLY 0x10 /* if corestorage is present, tell it to just pass */
	237	/* the DKIOUNMAP command through w/o acting on it */
	238	/* this is used by the compressed swap system to reclaim empty space */
	239
	240
	241	u_int32_t vnode_trim_list (vnode_t vp, struct trim_list *tl, boolean_t route_only)
39236c6e A	242	{
	243	int error = 0;
	244	int trim_index = 0;
	245	u_int32_t blocksize = 0;
	246	struct vnode *devvp;
	247	dk_extent_t *extents;
	248	dk_unmap_t unmap;
fe8ab488	249	_dk_cs_unmap_t cs_unmap;
39236c6e A	250
	251	if ( !(vp->v_mount->mnt_ioflags & MNT_IOFLAGS_UNMAP_SUPPORTED))
	252	return (ENOTSUP);
	253
	254	if (tl == NULL)
	255	return (0);
	256
	257	/*
	258	* Get the underlying device vnode and physical block size
	259	*/
	260	devvp = vp->v_mount->mnt_devvp;
	261	blocksize = vp->v_mount->mnt_devblocksize;
	262
	263	extents = kalloc(sizeof(dk_extent_t) * MAX_BATCH_TO_TRIM);
	264
fe8ab488 A	265	if (vp->v_mount->mnt_ioflags & MNT_IOFLAGS_CSUNMAP_SUPPORTED) {
	266	memset (&cs_unmap, 0, sizeof(_dk_cs_unmap_t));
	267	cs_unmap.extents = extents;
	268
	269	if (route_only == TRUE)
	270	cs_unmap.options = ROUTE_ONLY;
	271	} else {
	272	memset (&unmap, 0, sizeof(dk_unmap_t));
	273	unmap.extents = extents;
	274	}
39236c6e A	275
	276	while (tl) {
	277	daddr64_t io_blockno; /* Block number corresponding to the start of the extent */
	278	size_t io_bytecount; /* Number of bytes in current extent for the specified range */
	279	size_t trimmed;
	280	size_t remaining_length;
	281	off_t current_offset;
	282
	283	current_offset = tl->tl_offset;
	284	remaining_length = tl->tl_length;
	285	trimmed = 0;
	286
	287	/*
	288	* We may not get the entire range from tl_offset -> tl_offset+tl_length in a single
	289	* extent from the blockmap call. Keep looping/going until we are sure we've hit
	290	* the whole range or if we encounter an error.
	291	*/
	292	while (trimmed < tl->tl_length) {
	293	/*
	294	* VNOP_BLOCKMAP will tell us the logical to physical block number mapping for the
	295	* specified offset. It returns blocks in contiguous chunks, so if the logical range is
	296	* broken into multiple extents, it must be called multiple times, increasing the offset
	297	* in each call to ensure that the entire range is covered.
	298	*/
	299	error = VNOP_BLOCKMAP (vp, current_offset, remaining_length,
	300	&io_blockno, &io_bytecount, NULL, VNODE_READ, NULL);
	301
	302	if (error) {
	303	goto trim_exit;
	304	}
	305
	306	extents[trim_index].offset = (uint64_t) io_blockno * (u_int64_t) blocksize;
	307	extents[trim_index].length = io_bytecount;
	308
	309	trim_index++;
	310
	311	if (trim_index == MAX_BATCH_TO_TRIM) {
	312
fe8ab488 A	313	if (vp->v_mount->mnt_ioflags & MNT_IOFLAGS_CSUNMAP_SUPPORTED) {
	314	cs_unmap.extentsCount = trim_index;
	315	error = VNOP_IOCTL(devvp, _DKIOCCSUNMAP, (caddr_t)&cs_unmap, 0, vfs_context_kernel());
	316	} else {
	317	unmap.extentsCount = trim_index;
	318	error = VNOP_IOCTL(devvp, DKIOCUNMAP, (caddr_t)&unmap, 0, vfs_context_kernel());
	319	}
39236c6e A	320	if (error) {
	321	goto trim_exit;
	322	}
	323	trim_index = 0;
	324	}
	325	trimmed += io_bytecount;
	326	current_offset += io_bytecount;
	327	remaining_length -= io_bytecount;
	328	}
	329	tl = tl->tl_next;
	330	}
	331	if (trim_index) {
fe8ab488 A	332	if (vp->v_mount->mnt_ioflags & MNT_IOFLAGS_CSUNMAP_SUPPORTED) {
	333	cs_unmap.extentsCount = trim_index;
	334	error = VNOP_IOCTL(devvp, _DKIOCCSUNMAP, (caddr_t)&cs_unmap, 0, vfs_context_kernel());
	335	} else {
	336	unmap.extentsCount = trim_index;
	337	error = VNOP_IOCTL(devvp, DKIOCUNMAP, (caddr_t)&unmap, 0, vfs_context_kernel());
	338	}
39236c6e A	339	}
	340	trim_exit:
	341	kfree(extents, sizeof(dk_extent_t) * MAX_BATCH_TO_TRIM);
	342
	343	return error;
	344	}