1 /*- 2 * Copyright (c) 2010 Isilon Systems, Inc. 3 * Copyright (c) 2016 Matthew Macy (mmacy@mattmacy.io) 4 * Copyright (c) 2017 Mellanox Technologies, Ltd. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice unmodified, this list of conditions, and the following 12 * disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/rwlock.h> 35 36 #include <vm/vm.h> 37 #include <vm/pmap.h> 38 #include <vm/vm_object.h> 39 #include <vm/vm_map.h> 40 #include <vm/vm_page.h> 41 #include <vm/vm_pager.h> 42 43 #include <linux/fs.h> 44 #include <linux/mm.h> 45 #include <linux/shmem_fs.h> 46 47 struct page * 48 linux_shmem_read_mapping_page_gfp(vm_object_t obj, int pindex, gfp_t gfp) 49 { 50 vm_page_t page; 51 int rv; 52 53 if ((gfp & GFP_NOWAIT) != 0) 54 panic("GFP_NOWAIT is unimplemented"); 55 56 VM_OBJECT_WLOCK(obj); 57 rv = vm_page_grab_valid(&page, obj, pindex, VM_ALLOC_NORMAL | 58 VM_ALLOC_NOBUSY | VM_ALLOC_WIRED); 59 VM_OBJECT_WUNLOCK(obj); 60 if (rv != VM_PAGER_OK) 61 return (ERR_PTR(-EINVAL)); 62 return (page); 63 } 64 65 struct linux_file * 66 linux_shmem_file_setup(const char *name, loff_t size, unsigned long flags) 67 { 68 struct fileobj { 69 struct linux_file file __aligned(sizeof(void *)); 70 struct vnode vnode __aligned(sizeof(void *)); 71 }; 72 struct fileobj *fileobj; 73 struct linux_file *filp; 74 struct vnode *vp; 75 int error; 76 77 fileobj = kzalloc(sizeof(*fileobj), GFP_KERNEL); 78 if (fileobj == NULL) { 79 error = -ENOMEM; 80 goto err_0; 81 } 82 filp = &fileobj->file; 83 vp = &fileobj->vnode; 84 85 filp->f_count = 1; 86 filp->f_vnode = vp; 87 filp->f_shmem = vm_pager_allocate(OBJT_DEFAULT, NULL, size, 88 VM_PROT_READ | VM_PROT_WRITE, 0, curthread->td_ucred); 89 if (filp->f_shmem == NULL) { 90 error = -ENOMEM; 91 goto err_1; 92 } 93 return (filp); 94 err_1: 95 kfree(filp); 96 err_0: 97 return (ERR_PTR(error)); 98 } 99 100 static vm_ooffset_t 101 linux_invalidate_mapping_pages_sub(vm_object_t obj, vm_pindex_t start, 102 vm_pindex_t end, int flags) 103 { 104 int start_count, end_count; 105 106 VM_OBJECT_WLOCK(obj); 107 start_count = obj->resident_page_count; 108 vm_object_page_remove(obj, start, end, flags); 109 end_count = obj->resident_page_count; 110 VM_OBJECT_WUNLOCK(obj); 111 return (start_count - end_count); 112 } 113 114 unsigned long 115 linux_invalidate_mapping_pages(vm_object_t obj, pgoff_t start, pgoff_t end) 116 { 117 118 return (linux_invalidate_mapping_pages_sub(obj, start, end, OBJPR_CLEANONLY)); 119 } 120 121 void 122 linux_shmem_truncate_range(vm_object_t obj, loff_t lstart, loff_t lend) 123 { 124 vm_pindex_t start = OFF_TO_IDX(lstart + PAGE_SIZE - 1); 125 vm_pindex_t end = OFF_TO_IDX(lend + 1); 126 127 (void) linux_invalidate_mapping_pages_sub(obj, start, end, 0); 128 } 129