xnu-7195.101.1.tar.gz

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

diff --git a/bsd/vm/vm_compressor_backing_file.c b/bsd/vm/vm_compressor_backing_file.c
index 9a83330fb5be6328095e4153f298a0b2f27b9b67..5f4fb755ef0fba4eb9018f08871613cb9bd0d012 100644 (file)
--- a/bsd/vm/vm_compressor_backing_file.c
+++ b/bsd/vm/vm_compressor_backing_file.c
@@ -2,7 +2,7 @@
  * Copyright (c) 2000-2016 Apple Inc. All rights reserved.
  *
  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
  * Copyright (c) 2000-2016 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
  * 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


@@ -11,10 +11,10 @@
  * 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.
  * 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.
  * 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,
  * 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,


@@ -22,7 +22,7 @@
  * 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.
  * 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@
  */
 
  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  */
 


@@ -39,27 +39,32 @@
 #include <sys/disk.h>
 #include <vm/vm_protos.h>
 #include <vm/vm_pageout.h>
 #include <sys/disk.h>
 #include <vm/vm_protos.h>
 #include <vm/vm_pageout.h>

+#include <sys/content_protection.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, boolean_t *pin);
 uint64_t vm_swapfile_get_blksize(vnode_t vp);
 uint64_t vm_swapfile_get_transfer_size(vnode_t vp);
 
 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, boolean_t *pin);
 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);
+int vm_swapfile_io(vnode_t vp, uint64_t offset, uint64_t start, int npages, int flags, void *);

 int vm_record_file_write(struct vnode *vp, uint64_t offset, char *buf, int size);
 
 int vm_record_file_write(struct vnode *vp, uint64_t offset, char *buf, int size);
 

+#if CONFIG_FREEZE
+int vm_swap_vol_get_budget(vnode_t vp, uint64_t *freeze_daily_budget);
+#endif /* CONFIG_FREEZE */
+

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

-       vfs_context_t   ctx = vfs_context_kernel();
+       vfs_context_t   ctx = vfs_context_kernel();

 
        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;
 
        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;

-       }       
+       }

 
        /*
         * If MNT_IOFLAGS_NOSWAP is set, opening the swap file should fail.
 
        /*
         * If MNT_IOFLAGS_NOSWAP is set, opening the swap file should fail.


@@ -79,13 +84,13 @@ vm_swapfile_open(const char *path, vnode_t *vp)
 uint64_t
 vm_swapfile_get_blksize(vnode_t vp)
 {
 uint64_t
 vm_swapfile_get_blksize(vnode_t vp)
 {

-       return ((uint64_t)vfs_devblocksize(vnode_mount(vp)));
+       return (uint64_t)vfs_devblocksize(vnode_mount(vp));

 }
 
 uint64_t
 vm_swapfile_get_transfer_size(vnode_t vp)
 {
 }
 
 uint64_t
 vm_swapfile_get_transfer_size(vnode_t vp)
 {

-       return((uint64_t)vp->v_mount->mnt_vfsstat.f_iosize);
+       return (uint64_t)vp->v_mount->mnt_vfsstat.f_iosize;

 }
 
 int unlink1(vfs_context_t, vnode_t, user_addr_t, enum uio_seg, int);
 }
 
 int unlink1(vfs_context_t, vnode_t, user_addr_t, enum uio_seg, int);


@@ -98,24 +103,27 @@ vm_swapfile_close(uint64_t path_addr, vnode_t vp)
 
        vnode_getwithref(vp);
        vnode_close(vp, 0, context);
 
        vnode_getwithref(vp);
        vnode_close(vp, 0, context);

-       
+

        error = unlink1(context, NULLVP, CAST_USER_ADDR_T(path_addr),
            UIO_SYSSPACE, 0);
 
 #if DEVELOPMENT || DEBUG
        error = unlink1(context, NULLVP, CAST_USER_ADDR_T(path_addr),
            UIO_SYSSPACE, 0);
 
 #if DEVELOPMENT || DEBUG

-       if (error)
+       if (error) {

                printf("%s : unlink of %s failed with error %d", __FUNCTION__,
                    (char *)path_addr, error);
                printf("%s : unlink of %s failed with error %d", __FUNCTION__,
                    (char *)path_addr, error);

+       }

 #endif
 }
 
 int
 vm_swapfile_preallocate(vnode_t vp, uint64_t *size, boolean_t *pin)
 {
 #endif
 }
 
 int
 vm_swapfile_preallocate(vnode_t vp, uint64_t *size, boolean_t *pin)
 {

-       int             error = 0;
-       uint64_t        file_size = 0;
-       vfs_context_t   ctx = NULL;
-
+       int             error = 0;
+       uint64_t        file_size = 0;
+       vfs_context_t   ctx = NULL;
+#if CONFIG_FREEZE
+       struct vnode_attr va;
+#endif /* CONFIG_FREEZE */

 
        ctx = vfs_context_kernel();
 
 
        ctx = vfs_context_kernel();
 


@@ -131,9 +139,9 @@ vm_swapfile_preallocate(vnode_t vp, uint64_t *size, boolean_t *pin)
        if (error) {
                printf("vnode_size (new file) for swap file failed: %d\n", error);
                goto done;
        if (error) {
                printf("vnode_size (new file) for swap file failed: %d\n", error);
                goto done;

-       }       
+       }

        assert(file_size == *size);
        assert(file_size == *size);

-       
+

        if (pin != NULL && *pin != FALSE) {
                error = VNOP_IOCTL(vp, FIOPINSWAP, NULL, 0, ctx);
 
        if (pin != NULL && *pin != FALSE) {
                error = VNOP_IOCTL(vp, FIOPINSWAP, NULL, 0, ctx);
 


@@ -148,6 +156,18 @@ vm_swapfile_preallocate(vnode_t vp, uint64_t *size, boolean_t *pin)
        vnode_lock_spin(vp);
        SET(vp->v_flag, VSWAP);
        vnode_unlock(vp);
        vnode_lock_spin(vp);
        SET(vp->v_flag, VSWAP);
        vnode_unlock(vp);

+
+#if CONFIG_FREEZE
+       VATTR_INIT(&va);
+       VATTR_SET(&va, va_dataprotect_class, PROTECTION_CLASS_C);
+       error = VNOP_SETATTR(vp, &va, ctx);
+
+       if (error) {
+               printf("setattr PROTECTION_CLASS_C for swap file failed: %d\n", error);
+               goto done;
+       }
+#endif /* CONFIG_FREEZE */
+

 done:
        return error;
 }
 done:
        return error;
 }


@@ -160,48 +180,51 @@ vm_record_file_write(vnode_t vp, uint64_t offset, char *buf, int size)
        vfs_context_t ctx;
 
        ctx = vfs_context_kernel();
        vfs_context_t ctx;
 
        ctx = vfs_context_kernel();

-               
+

        error = vn_rdwr(UIO_WRITE, vp, (caddr_t)buf, size, offset,
        error = vn_rdwr(UIO_WRITE, vp, (caddr_t)buf, size, offset,

-               UIO_SYSSPACE, IO_NODELOCKED, vfs_context_ucred(ctx), (int *) 0, vfs_context_proc(ctx));
+           UIO_SYSSPACE, IO_NODELOCKED, vfs_context_ucred(ctx), (int *) 0, vfs_context_proc(ctx));

 
 

-       return (error);
+       return error;

 }
 
 
 
 int
 }
 
 
 
 int

-vm_swapfile_io(vnode_t vp, uint64_t offset, uint64_t start, int npages, int flags)
+vm_swapfile_io(vnode_t vp, uint64_t offset, uint64_t start, int npages, int flags, void *upl_iodone)

 {
        int error = 0;
 {
        int error = 0;

-       uint64_t io_size = npages * PAGE_SIZE_64;
+       upl_size_t io_size = (upl_size_t) (npages * PAGE_SIZE_64);

 #if 1
 #if 1

-       kern_return_t   kr = KERN_SUCCESS;
-       upl_t           upl = NULL;
-       unsigned int    count = 0;
+       kern_return_t   kr = KERN_SUCCESS;
+       upl_t           upl = NULL;
+       unsigned int    count = 0;

        upl_control_flags_t upl_create_flags = 0;
        upl_control_flags_t upl_create_flags = 0;

-       int             upl_control_flags = 0;
-       upl_size_t      upl_size = 0;
+       int             upl_control_flags = 0;
+       upl_size_t      upl_size = 0;

 
 

-       upl_create_flags = UPL_SET_INTERNAL | UPL_SET_LITE
-                       | UPL_MEMORY_TAG_MAKE(VM_KERN_MEMORY_OSFMK);
+       upl_create_flags = UPL_SET_INTERNAL | UPL_SET_LITE;
+
+       if (upl_iodone == NULL) {
+               upl_control_flags = UPL_IOSYNC;
+       }

 
 #if ENCRYPTED_SWAP
 
 #if ENCRYPTED_SWAP

-       upl_control_flags = UPL_IOSYNC | UPL_PAGING_ENCRYPTED;
-#else
-       upl_control_flags = UPL_IOSYNC;
+       upl_control_flags |= UPL_PAGING_ENCRYPTED;

 #endif
 #endif

+

        if ((flags & SWAP_READ) == FALSE) {
                upl_create_flags |= UPL_COPYOUT_FROM;
        }
        if ((flags & SWAP_READ) == FALSE) {
                upl_create_flags |= UPL_COPYOUT_FROM;
        }

- 
+

        upl_size = io_size;
        kr = vm_map_create_upl( kernel_map,
        upl_size = io_size;
        kr = vm_map_create_upl( kernel_map,

-                               start,
-                               &upl_size,
-                               &upl,
-                               NULL,
-                               &count,
-                               &upl_create_flags);
+           start,
+           &upl_size,
+           &upl,
+           NULL,
+           &count,
+           &upl_create_flags,
+           VM_KERN_MEMORY_OSFMK);

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


@@ -209,44 +232,46 @@ vm_swapfile_io(vnode_t vp, uint64_t offset, uint64_t start, int npages, int flag
 
        if (flags & SWAP_READ) {
                vnode_pagein(vp,
 
        if (flags & SWAP_READ) {
                vnode_pagein(vp,

-                             upl,
-                             0,
-                             offset,
-                             io_size,
-                             upl_control_flags | UPL_IGNORE_VALID_PAGE_CHECK,
-                             &error);
+                   upl,
+                   0,
+                   offset,
+                   io_size,
+                   upl_control_flags | UPL_IGNORE_VALID_PAGE_CHECK,
+                   &error);

                if (error) {
 #if DEBUG
                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);
+                       printf("vm_swapfile_io: vnode_pagein failed with %d (vp: %p, offset: 0x%llx, size:%u)\n", error, vp, offset, io_size);

 #else /* DEBUG */
                        printf("vm_swapfile_io: vnode_pagein failed with %d.\n", error);
 #endif /* DEBUG */
                }
 #else /* DEBUG */
                        printf("vm_swapfile_io: vnode_pagein failed with %d.\n", error);
 #endif /* DEBUG */
                }

-       

        } else {
        } else {

+               upl_set_iodone(upl, upl_iodone);
+

                vnode_pageout(vp,
                vnode_pageout(vp,

-                             upl,
-                             0,
-                             offset,
-                             io_size,
-                             upl_control_flags,
-                             &error);
+                   upl,
+                   0,
+                   offset,
+                   io_size,
+                   upl_control_flags,
+                   &error);

                if (error) {
 #if DEBUG
                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);
+                       printf("vm_swapfile_io: vnode_pageout failed with %d (vp: %p, offset: 0x%llx, size:%u)\n", error, vp, offset, io_size);

 #else /* DEBUG */
                        printf("vm_swapfile_io: vnode_pageout failed with %d.\n", error);
 #endif /* DEBUG */
                }
        }
 #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();
        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,
        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));
+           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);
 
        if (error) {
                printf("vn_rdwr: Swap I/O failed with %d\n", error);


@@ -256,28 +281,31 @@ vm_swapfile_io(vnode_t vp, uint64_t offset, uint64_t start, int npages, int flag
 }
 
 
 }
 
 

-#define MAX_BATCH_TO_TRIM      256
+#define MAX_BATCH_TO_TRIM       256

 
 

-#define ROUTE_ONLY             0x10            /* if corestorage is present, tell it to just pass */
+#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 */
 
 
                                                 /* 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)
+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);
+       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);
+       if (tl == NULL) {
+               return 0;
+       }

 
        /*
         * Get the underlying device vnode and physical block size
 
        /*
         * Get the underlying device vnode and physical block size


@@ -285,31 +313,33 @@ u_int32_t vnode_trim_list (vnode_t vp, struct trim_list *tl, boolean_t route_onl
        devvp = vp->v_mount->mnt_devvp;
        blocksize = vp->v_mount->mnt_devblocksize;
 
        devvp = vp->v_mount->mnt_devvp;
        blocksize = vp->v_mount->mnt_devblocksize;
 

-       extents = kalloc(sizeof(dk_extent_t) * MAX_BATCH_TO_TRIM);
+       extents = kheap_alloc(KHEAP_TEMP,
+           sizeof(dk_extent_t) * MAX_BATCH_TO_TRIM, Z_WAITOK);

 
        if (vp->v_mount->mnt_ioflags & MNT_IOFLAGS_CSUNMAP_SUPPORTED) {
 
        if (vp->v_mount->mnt_ioflags & MNT_IOFLAGS_CSUNMAP_SUPPORTED) {

-               memset (&cs_unmap, 0, sizeof(_dk_cs_unmap_t));
+               memset(&cs_unmap, 0, sizeof(_dk_cs_unmap_t));

                cs_unmap.extents = extents;
 
                cs_unmap.extents = extents;
 

-               if (route_only == TRUE)
+               if (route_only == TRUE) {

                        cs_unmap.options = ROUTE_ONLY;
                        cs_unmap.options = ROUTE_ONLY;

+               }

        } else {
        } else {

-               memset (&unmap, 0, sizeof(dk_unmap_t));
+               memset(&unmap, 0, sizeof(dk_unmap_t));

                unmap.extents = extents;
        }
 
        while (tl) {
                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; 
+               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;
 
                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.
                 * 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.


@@ -317,24 +347,23 @@ u_int32_t vnode_trim_list (vnode_t vp, struct trim_list *tl, boolean_t route_onl
                while (trimmed < tl->tl_length) {
                        /*
                         * VNOP_BLOCKMAP will tell us the logical to physical block number mapping for the
                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 
+                        * 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.
                         */
                         * 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);
+                       error = VNOP_BLOCKMAP(vp, current_offset, remaining_length,
+                           &io_blockno, &io_bytecount, NULL, VNODE_READ | VNODE_BLOCKMAP_NO_TRACK, NULL);

 
                        if (error) {
                                goto trim_exit;
                        }
 
                        if (error) {
                                goto trim_exit;
                        }

+                       if (io_blockno != -1) {
+                               extents[trim_index].offset = (uint64_t) io_blockno * (u_int64_t) blocksize;
+                               extents[trim_index].length = io_bytecount;

 
 

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

                        if (trim_index == MAX_BATCH_TO_TRIM) {
                        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());
                                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());


@@ -363,7 +392,23 @@ u_int32_t vnode_trim_list (vnode_t vp, struct trim_list *tl, boolean_t route_onl
                }
        }
 trim_exit:
                }
        }
 trim_exit:

-       kfree(extents, sizeof(dk_extent_t) * MAX_BATCH_TO_TRIM);
+       kheap_free(KHEAP_TEMP, extents, sizeof(dk_extent_t) * MAX_BATCH_TO_TRIM);

 
        return error;
 }
 
        return error;
 }

+
+#if CONFIG_FREEZE
+int
+vm_swap_vol_get_budget(vnode_t vp, uint64_t *freeze_daily_budget)
+{
+       vnode_t         devvp = NULL;
+       vfs_context_t   ctx = vfs_context_kernel();
+       errno_t         err = 0;
+
+       devvp = vp->v_mount->mnt_devvp;
+
+       err = VNOP_IOCTL(devvp, DKIOCGETMAXSWAPWRITE, (caddr_t)freeze_daily_budget, 0, ctx);
+
+       return err;
+}
+#endif /* CONFIG_FREEZE */