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/param.h> 30 #include <sys/systm.h> 31 #include <sys/rwlock.h> 32 33 #include <vm/vm.h> 34 #include <vm/pmap.h> 35 #include <vm/vm_object.h> 36 #include <vm/vm_map.h> 37 #include <vm/vm_page.h> 38 #include <vm/vm_pager.h> 39 40 #include <linux/fs.h> 41 #include <linux/mm.h> 42 #include <linux/shmem_fs.h> 43 44 struct page * 45 linux_shmem_read_mapping_page_gfp(vm_object_t obj, int pindex, gfp_t gfp) 46 { 47 struct page *page; 48 int rv; 49 50 if ((gfp & GFP_NOWAIT) != 0) 51 panic("GFP_NOWAIT is unimplemented"); 52 53 VM_OBJECT_WLOCK(obj); 54 rv = vm_page_grab_valid(&page, obj, pindex, VM_ALLOC_NORMAL | 55 VM_ALLOC_NOBUSY | VM_ALLOC_WIRED); 56 VM_OBJECT_WUNLOCK(obj); 57 if (rv != VM_PAGER_OK) 58 return (ERR_PTR(-EINVAL)); 59 return (page); 60 } 61 62 struct linux_file * 63 linux_shmem_file_setup(const char *name, loff_t size, unsigned long flags) 64 { 65 struct fileobj { 66 struct linux_file file __aligned(sizeof(void *)); 67 struct vnode vnode __aligned(sizeof(void *)); 68 }; 69 struct fileobj *fileobj; 70 struct linux_file *filp; 71 struct vnode *vp; 72 int error; 73 74 fileobj = kzalloc(sizeof(*fileobj), GFP_KERNEL); 75 if (fileobj == NULL) { 76 error = -ENOMEM; 77 goto err_0; 78 } 79 filp = &fileobj->file; 80 vp = &fileobj->vnode; 81 82 filp->f_count = 1; 83 filp->f_vnode = vp; 84 filp->f_shmem = vm_pager_allocate(OBJT_SWAP, NULL, size, 85 VM_PROT_READ | VM_PROT_WRITE, 0, curthread->td_ucred); 86 if (filp->f_shmem == NULL) { 87 error = -ENOMEM; 88 goto err_1; 89 } 90 return (filp); 91 err_1: 92 kfree(filp); 93 err_0: 94 return (ERR_PTR(error)); 95 } 96 97 static vm_ooffset_t 98 linux_invalidate_mapping_pages_sub(vm_object_t obj, vm_pindex_t start, 99 vm_pindex_t end, int flags) 100 { 101 int start_count, end_count; 102 103 VM_OBJECT_WLOCK(obj); 104 start_count = obj->resident_page_count; 105 vm_object_page_remove(obj, start, end, flags); 106 end_count = obj->resident_page_count; 107 VM_OBJECT_WUNLOCK(obj); 108 return (start_count - end_count); 109 } 110 111 unsigned long 112 linux_invalidate_mapping_pages(vm_object_t obj, pgoff_t start, pgoff_t end) 113 { 114 115 return (linux_invalidate_mapping_pages_sub(obj, start, end, OBJPR_CLEANONLY)); 116 } 117 118 void 119 linux_shmem_truncate_range(vm_object_t obj, loff_t lstart, loff_t lend) 120 { 121 vm_pindex_t start = OFF_TO_IDX(lstart + PAGE_SIZE - 1); 122 vm_pindex_t end = OFF_TO_IDX(lend + 1); 123 124 (void) linux_invalidate_mapping_pages_sub(obj, start, end, 0); 125 } 126