vm_vfs.c revision 1.3.2.2
1 1.3.2.2 mjf /* $NetBSD: vm_vfs.c,v 1.3.2.2 2009/01/17 13:29:38 mjf Exp $ */ 2 1.3.2.2 mjf 3 1.3.2.2 mjf /* 4 1.3.2.2 mjf * Copyright (c) 2008 Antti Kantee. All Rights Reserved. 5 1.3.2.2 mjf * 6 1.3.2.2 mjf * Development of this software was supported by the 7 1.3.2.2 mjf * Finnish Cultural Foundation. 8 1.3.2.2 mjf * 9 1.3.2.2 mjf * Redistribution and use in source and binary forms, with or without 10 1.3.2.2 mjf * modification, are permitted provided that the following conditions 11 1.3.2.2 mjf * are met: 12 1.3.2.2 mjf * 1. Redistributions of source code must retain the above copyright 13 1.3.2.2 mjf * notice, this list of conditions and the following disclaimer. 14 1.3.2.2 mjf * 2. Redistributions in binary form must reproduce the above copyright 15 1.3.2.2 mjf * notice, this list of conditions and the following disclaimer in the 16 1.3.2.2 mjf * documentation and/or other materials provided with the distribution. 17 1.3.2.2 mjf * 18 1.3.2.2 mjf * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS 19 1.3.2.2 mjf * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 20 1.3.2.2 mjf * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 21 1.3.2.2 mjf * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 1.3.2.2 mjf * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 1.3.2.2 mjf * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 24 1.3.2.2 mjf * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 1.3.2.2 mjf * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 1.3.2.2 mjf * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 1.3.2.2 mjf * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 1.3.2.2 mjf * SUCH DAMAGE. 29 1.3.2.2 mjf */ 30 1.3.2.2 mjf 31 1.3.2.2 mjf #include <sys/cdefs.h> 32 1.3.2.2 mjf __KERNEL_RCSID(0, "$NetBSD: vm_vfs.c,v 1.3.2.2 2009/01/17 13:29:38 mjf Exp $"); 33 1.3.2.2 mjf 34 1.3.2.2 mjf #include <sys/param.h> 35 1.3.2.2 mjf 36 1.3.2.2 mjf #include <sys/buf.h> 37 1.3.2.2 mjf #include <sys/vnode.h> 38 1.3.2.2 mjf 39 1.3.2.2 mjf #include <uvm/uvm.h> 40 1.3.2.2 mjf #include <uvm/uvm_readahead.h> 41 1.3.2.2 mjf 42 1.3.2.2 mjf static int vn_get(struct uvm_object *, voff_t, struct vm_page **, 43 1.3.2.2 mjf int *, int, vm_prot_t, int, int); 44 1.3.2.2 mjf static int vn_put(struct uvm_object *, voff_t, voff_t, int); 45 1.3.2.2 mjf 46 1.3.2.2 mjf const struct uvm_pagerops uvm_vnodeops = { 47 1.3.2.2 mjf .pgo_get = vn_get, 48 1.3.2.2 mjf .pgo_put = vn_put, 49 1.3.2.2 mjf }; 50 1.3.2.2 mjf 51 1.3.2.2 mjf /* 52 1.3.2.2 mjf * vnode pager 53 1.3.2.2 mjf */ 54 1.3.2.2 mjf 55 1.3.2.2 mjf static int 56 1.3.2.2 mjf vn_get(struct uvm_object *uobj, voff_t off, struct vm_page **pgs, 57 1.3.2.2 mjf int *npages, int centeridx, vm_prot_t access_type, 58 1.3.2.2 mjf int advice, int flags) 59 1.3.2.2 mjf { 60 1.3.2.2 mjf struct vnode *vp = (struct vnode *)uobj; 61 1.3.2.2 mjf 62 1.3.2.2 mjf return VOP_GETPAGES(vp, off, pgs, npages, centeridx, access_type, 63 1.3.2.2 mjf advice, flags); 64 1.3.2.2 mjf } 65 1.3.2.2 mjf 66 1.3.2.2 mjf static int 67 1.3.2.2 mjf vn_put(struct uvm_object *uobj, voff_t offlo, voff_t offhi, int flags) 68 1.3.2.2 mjf { 69 1.3.2.2 mjf struct vnode *vp = (struct vnode *)uobj; 70 1.3.2.2 mjf 71 1.3.2.2 mjf return VOP_PUTPAGES(vp, offlo, offhi, flags); 72 1.3.2.2 mjf } 73 1.3.2.2 mjf 74 1.3.2.2 mjf void 75 1.3.2.2 mjf uvm_aio_biodone1(struct buf *bp) 76 1.3.2.2 mjf { 77 1.3.2.2 mjf 78 1.3.2.2 mjf panic("%s: unimplemented", __func__); 79 1.3.2.2 mjf } 80 1.3.2.2 mjf 81 1.3.2.2 mjf void 82 1.3.2.2 mjf uvm_aio_biodone(struct buf *bp) 83 1.3.2.2 mjf { 84 1.3.2.2 mjf 85 1.3.2.2 mjf uvm_aio_aiodone(bp); 86 1.3.2.2 mjf } 87 1.3.2.2 mjf 88 1.3.2.2 mjf void 89 1.3.2.2 mjf uvm_aio_aiodone(struct buf *bp) 90 1.3.2.2 mjf { 91 1.3.2.2 mjf 92 1.3.2.2 mjf if (((bp->b_flags|bp->b_cflags) & (B_READ|BC_NOCACHE)) == 0 && bioopsp) 93 1.3.2.2 mjf bioopsp->io_pageiodone(bp); 94 1.3.2.2 mjf } 95 1.3.2.2 mjf 96 1.3.2.2 mjf struct uvm_ractx * 97 1.3.2.2 mjf uvm_ra_allocctx() 98 1.3.2.2 mjf { 99 1.3.2.2 mjf 100 1.3.2.2 mjf return NULL; 101 1.3.2.2 mjf } 102 1.3.2.2 mjf 103 1.3.2.2 mjf void 104 1.3.2.2 mjf uvm_ra_freectx(struct uvm_ractx *ra) 105 1.3.2.2 mjf { 106 1.3.2.2 mjf 107 1.3.2.2 mjf return; 108 1.3.2.2 mjf } 109 1.3.2.2 mjf 110 1.3.2.2 mjf bool 111 1.3.2.2 mjf uvn_clean_p(struct uvm_object *uobj) 112 1.3.2.2 mjf { 113 1.3.2.2 mjf struct vnode *vp = (void *)uobj; 114 1.3.2.2 mjf 115 1.3.2.2 mjf return (vp->v_iflag & VI_ONWORKLST) == 0; 116 1.3.2.2 mjf } 117 1.3.2.2 mjf 118 1.3.2.2 mjf void 119 1.3.2.2 mjf uvm_vnp_setsize(struct vnode *vp, voff_t newsize) 120 1.3.2.2 mjf { 121 1.3.2.2 mjf 122 1.3.2.2 mjf mutex_enter(&vp->v_interlock); 123 1.3.2.2 mjf vp->v_size = vp->v_writesize = newsize; 124 1.3.2.2 mjf mutex_exit(&vp->v_interlock); 125 1.3.2.2 mjf } 126 1.3.2.2 mjf 127 1.3.2.2 mjf void 128 1.3.2.2 mjf uvm_vnp_setwritesize(struct vnode *vp, voff_t newsize) 129 1.3.2.2 mjf { 130 1.3.2.2 mjf 131 1.3.2.2 mjf mutex_enter(&vp->v_interlock); 132 1.3.2.2 mjf vp->v_writesize = newsize; 133 1.3.2.2 mjf mutex_exit(&vp->v_interlock); 134 1.3.2.2 mjf } 135 1.3.2.2 mjf 136 1.3.2.2 mjf void 137 1.3.2.2 mjf uvm_vnp_zerorange(struct vnode *vp, off_t off, size_t len) 138 1.3.2.2 mjf { 139 1.3.2.2 mjf struct uvm_object *uobj = &vp->v_uobj; 140 1.3.2.2 mjf struct vm_page **pgs; 141 1.3.2.2 mjf int maxpages = MIN(32, round_page(len) >> PAGE_SHIFT); 142 1.3.2.2 mjf int rv, npages, i; 143 1.3.2.2 mjf 144 1.3.2.2 mjf pgs = kmem_zalloc(maxpages * sizeof(pgs), KM_SLEEP); 145 1.3.2.2 mjf while (len) { 146 1.3.2.2 mjf npages = MIN(maxpages, round_page(len) >> PAGE_SHIFT); 147 1.3.2.2 mjf memset(pgs, 0, npages * sizeof(struct vm_page *)); 148 1.3.2.2 mjf mutex_enter(&uobj->vmobjlock); 149 1.3.2.2 mjf rv = uobj->pgops->pgo_get(uobj, off, pgs, &npages, 0, 0, 0, 0); 150 1.3.2.2 mjf KASSERT(npages > 0); 151 1.3.2.2 mjf 152 1.3.2.2 mjf for (i = 0; i < npages; i++) { 153 1.3.2.2 mjf uint8_t *start; 154 1.3.2.2 mjf size_t chunkoff, chunklen; 155 1.3.2.2 mjf 156 1.3.2.2 mjf chunkoff = off & PAGE_MASK; 157 1.3.2.2 mjf chunklen = MIN(PAGE_SIZE - chunkoff, len); 158 1.3.2.2 mjf start = (uint8_t *)pgs[i]->uanon + chunkoff; 159 1.3.2.2 mjf 160 1.3.2.2 mjf memset(start, 0, chunklen); 161 1.3.2.2 mjf pgs[i]->flags &= ~PG_CLEAN; 162 1.3.2.2 mjf 163 1.3.2.2 mjf off += chunklen; 164 1.3.2.2 mjf len -= chunklen; 165 1.3.2.2 mjf } 166 1.3.2.2 mjf uvm_page_unbusy(pgs, npages); 167 1.3.2.2 mjf } 168 1.3.2.2 mjf kmem_free(pgs, maxpages * sizeof(pgs)); 169 1.3.2.2 mjf 170 1.3.2.2 mjf return; 171 1.3.2.2 mjf } 172 1.3.2.2 mjf 173 1.3.2.2 mjf /* 174 1.3.2.2 mjf * UBC 175 1.3.2.2 mjf */ 176 1.3.2.2 mjf 177 1.3.2.2 mjf /* dumdidumdum */ 178 1.3.2.2 mjf #define len2npages(off, len) \ 179 1.3.2.2 mjf (((((len) + PAGE_MASK) & ~(PAGE_MASK)) >> PAGE_SHIFT) \ 180 1.3.2.2 mjf + (((off & PAGE_MASK) + (len & PAGE_MASK)) > PAGE_SIZE)) 181 1.3.2.2 mjf 182 1.3.2.2 mjf int 183 1.3.2.2 mjf ubc_uiomove(struct uvm_object *uobj, struct uio *uio, vsize_t todo, 184 1.3.2.2 mjf int advice, int flags) 185 1.3.2.2 mjf { 186 1.3.2.2 mjf struct vm_page **pgs; 187 1.3.2.2 mjf int npages = len2npages(uio->uio_offset, todo); 188 1.3.2.2 mjf size_t pgalloc; 189 1.3.2.2 mjf int i, rv; 190 1.3.2.2 mjf 191 1.3.2.2 mjf pgalloc = npages * sizeof(pgs); 192 1.3.2.2 mjf pgs = kmem_zalloc(pgalloc, KM_SLEEP); 193 1.3.2.2 mjf 194 1.3.2.2 mjf do { 195 1.3.2.2 mjf mutex_enter(&uobj->vmobjlock); 196 1.3.2.2 mjf rv = uobj->pgops->pgo_get(uobj, uio->uio_offset, pgs, &npages, 197 1.3.2.2 mjf 0, 0, 0, 0); 198 1.3.2.2 mjf if (rv) 199 1.3.2.2 mjf goto out; 200 1.3.2.2 mjf 201 1.3.2.2 mjf for (i = 0; i < npages; i++) { 202 1.3.2.2 mjf size_t xfersize; 203 1.3.2.2 mjf off_t pageoff; 204 1.3.2.2 mjf 205 1.3.2.2 mjf pageoff = uio->uio_offset & PAGE_MASK; 206 1.3.2.2 mjf xfersize = MIN(MIN(todo, PAGE_SIZE), PAGE_SIZE-pageoff); 207 1.3.2.2 mjf uiomove((uint8_t *)pgs[i]->uanon + pageoff, 208 1.3.2.2 mjf xfersize, uio); 209 1.3.2.2 mjf if (uio->uio_rw == UIO_WRITE) 210 1.3.2.2 mjf pgs[i]->flags &= ~PG_CLEAN; 211 1.3.2.2 mjf todo -= xfersize; 212 1.3.2.2 mjf } 213 1.3.2.2 mjf uvm_page_unbusy(pgs, npages); 214 1.3.2.2 mjf } while (todo); 215 1.3.2.2 mjf 216 1.3.2.2 mjf out: 217 1.3.2.2 mjf kmem_free(pgs, pgalloc); 218 1.3.2.2 mjf return rv; 219 1.3.2.2 mjf } 220
Indexes created Thu Oct 02 14:10:14 GMT 2025