vm_vfs.c revision 1.5.2.2
1 1.5.2.2 yamt /* $NetBSD: vm_vfs.c,v 1.5.2.2 2009/05/04 08:14:31 yamt Exp $ */ 2 1.5.2.2 yamt 3 1.5.2.2 yamt /* 4 1.5.2.2 yamt * Copyright (c) 2008 Antti Kantee. All Rights Reserved. 5 1.5.2.2 yamt * 6 1.5.2.2 yamt * Development of this software was supported by the 7 1.5.2.2 yamt * Finnish Cultural Foundation. 8 1.5.2.2 yamt * 9 1.5.2.2 yamt * Redistribution and use in source and binary forms, with or without 10 1.5.2.2 yamt * modification, are permitted provided that the following conditions 11 1.5.2.2 yamt * are met: 12 1.5.2.2 yamt * 1. Redistributions of source code must retain the above copyright 13 1.5.2.2 yamt * notice, this list of conditions and the following disclaimer. 14 1.5.2.2 yamt * 2. Redistributions in binary form must reproduce the above copyright 15 1.5.2.2 yamt * notice, this list of conditions and the following disclaimer in the 16 1.5.2.2 yamt * documentation and/or other materials provided with the distribution. 17 1.5.2.2 yamt * 18 1.5.2.2 yamt * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS 19 1.5.2.2 yamt * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 20 1.5.2.2 yamt * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 21 1.5.2.2 yamt * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 1.5.2.2 yamt * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 1.5.2.2 yamt * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 24 1.5.2.2 yamt * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 1.5.2.2 yamt * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 1.5.2.2 yamt * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 1.5.2.2 yamt * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 1.5.2.2 yamt * SUCH DAMAGE. 29 1.5.2.2 yamt */ 30 1.5.2.2 yamt 31 1.5.2.2 yamt #include <sys/cdefs.h> 32 1.5.2.2 yamt __KERNEL_RCSID(0, "$NetBSD: vm_vfs.c,v 1.5.2.2 2009/05/04 08:14:31 yamt Exp $"); 33 1.5.2.2 yamt 34 1.5.2.2 yamt #include <sys/param.h> 35 1.5.2.2 yamt 36 1.5.2.2 yamt #include <sys/buf.h> 37 1.5.2.2 yamt #include <sys/vnode.h> 38 1.5.2.2 yamt 39 1.5.2.2 yamt #include <uvm/uvm.h> 40 1.5.2.2 yamt #include <uvm/uvm_readahead.h> 41 1.5.2.2 yamt 42 1.5.2.2 yamt static int vn_get(struct uvm_object *, voff_t, struct vm_page **, 43 1.5.2.2 yamt int *, int, vm_prot_t, int, int); 44 1.5.2.2 yamt static int vn_put(struct uvm_object *, voff_t, voff_t, int); 45 1.5.2.2 yamt 46 1.5.2.2 yamt const struct uvm_pagerops uvm_vnodeops = { 47 1.5.2.2 yamt .pgo_get = vn_get, 48 1.5.2.2 yamt .pgo_put = vn_put, 49 1.5.2.2 yamt }; 50 1.5.2.2 yamt 51 1.5.2.2 yamt /* 52 1.5.2.2 yamt * vnode pager 53 1.5.2.2 yamt */ 54 1.5.2.2 yamt 55 1.5.2.2 yamt static int 56 1.5.2.2 yamt vn_get(struct uvm_object *uobj, voff_t off, struct vm_page **pgs, 57 1.5.2.2 yamt int *npages, int centeridx, vm_prot_t access_type, 58 1.5.2.2 yamt int advice, int flags) 59 1.5.2.2 yamt { 60 1.5.2.2 yamt struct vnode *vp = (struct vnode *)uobj; 61 1.5.2.2 yamt 62 1.5.2.2 yamt return VOP_GETPAGES(vp, off, pgs, npages, centeridx, access_type, 63 1.5.2.2 yamt advice, flags); 64 1.5.2.2 yamt } 65 1.5.2.2 yamt 66 1.5.2.2 yamt static int 67 1.5.2.2 yamt vn_put(struct uvm_object *uobj, voff_t offlo, voff_t offhi, int flags) 68 1.5.2.2 yamt { 69 1.5.2.2 yamt struct vnode *vp = (struct vnode *)uobj; 70 1.5.2.2 yamt 71 1.5.2.2 yamt return VOP_PUTPAGES(vp, offlo, offhi, flags); 72 1.5.2.2 yamt } 73 1.5.2.2 yamt 74 1.5.2.2 yamt void 75 1.5.2.2 yamt uvm_aio_biodone1(struct buf *bp) 76 1.5.2.2 yamt { 77 1.5.2.2 yamt 78 1.5.2.2 yamt panic("%s: unimplemented", __func__); 79 1.5.2.2 yamt } 80 1.5.2.2 yamt 81 1.5.2.2 yamt void 82 1.5.2.2 yamt uvm_aio_biodone(struct buf *bp) 83 1.5.2.2 yamt { 84 1.5.2.2 yamt 85 1.5.2.2 yamt uvm_aio_aiodone(bp); 86 1.5.2.2 yamt } 87 1.5.2.2 yamt 88 1.5.2.2 yamt void 89 1.5.2.2 yamt uvm_aio_aiodone(struct buf *bp) 90 1.5.2.2 yamt { 91 1.5.2.2 yamt 92 1.5.2.2 yamt } 93 1.5.2.2 yamt 94 1.5.2.2 yamt struct uvm_ractx * 95 1.5.2.2 yamt uvm_ra_allocctx(void) 96 1.5.2.2 yamt { 97 1.5.2.2 yamt 98 1.5.2.2 yamt return NULL; 99 1.5.2.2 yamt } 100 1.5.2.2 yamt 101 1.5.2.2 yamt void 102 1.5.2.2 yamt uvm_ra_freectx(struct uvm_ractx *ra) 103 1.5.2.2 yamt { 104 1.5.2.2 yamt 105 1.5.2.2 yamt return; 106 1.5.2.2 yamt } 107 1.5.2.2 yamt 108 1.5.2.2 yamt bool 109 1.5.2.2 yamt uvn_clean_p(struct uvm_object *uobj) 110 1.5.2.2 yamt { 111 1.5.2.2 yamt struct vnode *vp = (void *)uobj; 112 1.5.2.2 yamt 113 1.5.2.2 yamt return (vp->v_iflag & VI_ONWORKLST) == 0; 114 1.5.2.2 yamt } 115 1.5.2.2 yamt 116 1.5.2.2 yamt void 117 1.5.2.2 yamt uvm_vnp_setsize(struct vnode *vp, voff_t newsize) 118 1.5.2.2 yamt { 119 1.5.2.2 yamt 120 1.5.2.2 yamt mutex_enter(&vp->v_interlock); 121 1.5.2.2 yamt vp->v_size = vp->v_writesize = newsize; 122 1.5.2.2 yamt mutex_exit(&vp->v_interlock); 123 1.5.2.2 yamt } 124 1.5.2.2 yamt 125 1.5.2.2 yamt void 126 1.5.2.2 yamt uvm_vnp_setwritesize(struct vnode *vp, voff_t newsize) 127 1.5.2.2 yamt { 128 1.5.2.2 yamt 129 1.5.2.2 yamt mutex_enter(&vp->v_interlock); 130 1.5.2.2 yamt vp->v_writesize = newsize; 131 1.5.2.2 yamt mutex_exit(&vp->v_interlock); 132 1.5.2.2 yamt } 133 1.5.2.2 yamt 134 1.5.2.2 yamt void 135 1.5.2.2 yamt uvm_vnp_zerorange(struct vnode *vp, off_t off, size_t len) 136 1.5.2.2 yamt { 137 1.5.2.2 yamt struct uvm_object *uobj = &vp->v_uobj; 138 1.5.2.2 yamt struct vm_page **pgs; 139 1.5.2.2 yamt int maxpages = MIN(32, round_page(len) >> PAGE_SHIFT); 140 1.5.2.2 yamt int rv, npages, i; 141 1.5.2.2 yamt 142 1.5.2.2 yamt pgs = kmem_zalloc(maxpages * sizeof(pgs), KM_SLEEP); 143 1.5.2.2 yamt while (len) { 144 1.5.2.2 yamt npages = MIN(maxpages, round_page(len) >> PAGE_SHIFT); 145 1.5.2.2 yamt memset(pgs, 0, npages * sizeof(struct vm_page *)); 146 1.5.2.2 yamt mutex_enter(&uobj->vmobjlock); 147 1.5.2.2 yamt rv = uobj->pgops->pgo_get(uobj, off, pgs, &npages, 0, 0, 0, 0); 148 1.5.2.2 yamt KASSERT(npages > 0); 149 1.5.2.2 yamt 150 1.5.2.2 yamt for (i = 0; i < npages; i++) { 151 1.5.2.2 yamt uint8_t *start; 152 1.5.2.2 yamt size_t chunkoff, chunklen; 153 1.5.2.2 yamt 154 1.5.2.2 yamt chunkoff = off & PAGE_MASK; 155 1.5.2.2 yamt chunklen = MIN(PAGE_SIZE - chunkoff, len); 156 1.5.2.2 yamt start = (uint8_t *)pgs[i]->uanon + chunkoff; 157 1.5.2.2 yamt 158 1.5.2.2 yamt memset(start, 0, chunklen); 159 1.5.2.2 yamt pgs[i]->flags &= ~PG_CLEAN; 160 1.5.2.2 yamt 161 1.5.2.2 yamt off += chunklen; 162 1.5.2.2 yamt len -= chunklen; 163 1.5.2.2 yamt } 164 1.5.2.2 yamt uvm_page_unbusy(pgs, npages); 165 1.5.2.2 yamt } 166 1.5.2.2 yamt kmem_free(pgs, maxpages * sizeof(pgs)); 167 1.5.2.2 yamt 168 1.5.2.2 yamt return; 169 1.5.2.2 yamt } 170 1.5.2.2 yamt 171 1.5.2.2 yamt /* 172 1.5.2.2 yamt * UBC 173 1.5.2.2 yamt */ 174 1.5.2.2 yamt 175 1.5.2.2 yamt /* dumdidumdum */ 176 1.5.2.2 yamt #define len2npages(off, len) \ 177 1.5.2.2 yamt (((((len) + PAGE_MASK) & ~(PAGE_MASK)) >> PAGE_SHIFT) \ 178 1.5.2.2 yamt + (((off & PAGE_MASK) + (len & PAGE_MASK)) > PAGE_SIZE)) 179 1.5.2.2 yamt 180 1.5.2.2 yamt int 181 1.5.2.2 yamt ubc_uiomove(struct uvm_object *uobj, struct uio *uio, vsize_t todo, 182 1.5.2.2 yamt int advice, int flags) 183 1.5.2.2 yamt { 184 1.5.2.2 yamt struct vm_page **pgs; 185 1.5.2.2 yamt int npages = len2npages(uio->uio_offset, todo); 186 1.5.2.2 yamt size_t pgalloc; 187 1.5.2.2 yamt int i, rv; 188 1.5.2.2 yamt 189 1.5.2.2 yamt pgalloc = npages * sizeof(pgs); 190 1.5.2.2 yamt pgs = kmem_zalloc(pgalloc, KM_SLEEP); 191 1.5.2.2 yamt 192 1.5.2.2 yamt do { 193 1.5.2.2 yamt mutex_enter(&uobj->vmobjlock); 194 1.5.2.2 yamt rv = uobj->pgops->pgo_get(uobj, uio->uio_offset, pgs, &npages, 195 1.5.2.2 yamt 0, 0, 0, 0); 196 1.5.2.2 yamt if (rv) 197 1.5.2.2 yamt goto out; 198 1.5.2.2 yamt 199 1.5.2.2 yamt for (i = 0; i < npages; i++) { 200 1.5.2.2 yamt size_t xfersize; 201 1.5.2.2 yamt off_t pageoff; 202 1.5.2.2 yamt 203 1.5.2.2 yamt pageoff = uio->uio_offset & PAGE_MASK; 204 1.5.2.2 yamt xfersize = MIN(MIN(todo, PAGE_SIZE), PAGE_SIZE-pageoff); 205 1.5.2.2 yamt uiomove((uint8_t *)pgs[i]->uanon + pageoff, 206 1.5.2.2 yamt xfersize, uio); 207 1.5.2.2 yamt if (uio->uio_rw == UIO_WRITE) 208 1.5.2.2 yamt pgs[i]->flags &= ~PG_CLEAN; 209 1.5.2.2 yamt todo -= xfersize; 210 1.5.2.2 yamt } 211 1.5.2.2 yamt uvm_page_unbusy(pgs, npages); 212 1.5.2.2 yamt } while (todo); 213 1.5.2.2 yamt 214 1.5.2.2 yamt out: 215 1.5.2.2 yamt kmem_free(pgs, pgalloc); 216 1.5.2.2 yamt return rv; 217 1.5.2.2 yamt } 218
Indexes created Thu Oct 02 14:10:14 GMT 2025