X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/9bccf70c0258c7cac2dcb80011b2a964d884c552..43866e378188c25dd1e2208016ab3cbeb086ae6c:/osfmk/default_pager/dp_backing_store.c diff --git a/osfmk/default_pager/dp_backing_store.c b/osfmk/default_pager/dp_backing_store.c index 112ced6c6..8d0163625 100644 --- a/osfmk/default_pager/dp_backing_store.c +++ b/osfmk/default_pager/dp_backing_store.c @@ -1,22 +1,24 @@ - /* * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * - * The contents of this file constitute Original Code as defined in and - * are subject to the Apple Public Source License Version 1.1 (the - * "License"). You may not use this file except in compliance with the - * License. Please obtain a copy of the License at - * http://www.apple.com/publicsource and read it before using this file. + * Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved. + * + * 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 + * compliance with the License. Please obtain a copy of the License at + * http://www.opensource.apple.com/apsl/ and read it before using this + * file. * - * This Original Code and all software distributed under the License are - * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER + * 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, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, - * FITNESS FOR A PARTICULAR PURPOSE 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_LICENSE_HEADER_END@ */ @@ -2550,10 +2552,16 @@ pvs_cluster_read( int ps_info_valid; int page_list_count; - if (cnt > VM_SUPER_CLUSTER) + if((vs_offset & cl_mask) && + (cnt > (VM_SUPER_CLUSTER - + (vs_offset & cl_mask)))) { + size = VM_SUPER_CLUSTER; + size -= vs_offset & cl_mask; + } else if (cnt > VM_SUPER_CLUSTER) { size = VM_SUPER_CLUSTER; - else + } else { size = cnt; + } cnt -= size; ps_info_valid = 0; @@ -2658,9 +2666,11 @@ pvs_cluster_read( */ for (xfer_size = 0; xfer_size < size; ) { - while (cl_index < pages_in_cl && xfer_size < size) { + while (cl_index < pages_in_cl + && xfer_size < size) { /* - * accumulate allocated pages within a physical segment + * accumulate allocated pages within + * a physical segment */ if (CLMAP_ISSET(clmap, cl_index)) { xfer_size += vm_page_size; @@ -2672,35 +2682,43 @@ pvs_cluster_read( } else break; } - if (cl_index < pages_in_cl || xfer_size >= size) { + if (cl_index < pages_in_cl + || xfer_size >= size) { /* - * we've hit an unallocated page or the - * end of this request... go fire the I/O + * we've hit an unallocated page or + * the end of this request... go fire + * the I/O */ break; } /* - * we've hit the end of the current physical segment - * and there's more to do, so try moving to the next one + * we've hit the end of the current physical + * segment and there's more to do, so try + * moving to the next one */ seg_index++; - ps_offset[seg_index] = ps_clmap(vs, cur_offset & ~cl_mask, &clmap, CL_FIND, 0, 0); - psp[seg_index] = CLMAP_PS(clmap); + ps_offset[seg_index] = + ps_clmap(vs, + cur_offset & ~cl_mask, + &clmap, CL_FIND, 0, 0); + psp[seg_index] = CLMAP_PS(clmap); ps_info_valid = 1; if ((ps_offset[seg_index - 1] != (ps_offset[seg_index] - cl_size)) || (psp[seg_index - 1] != psp[seg_index])) { /* - * if the physical segment we're about to step into - * is not contiguous to the one we're currently - * in, or it's in a different paging file, or + * if the physical segment we're about + * to step into is not contiguous to + * the one we're currently in, or it's + * in a different paging file, or * it hasn't been allocated.... * we stop here and generate the I/O */ break; } /* - * start with first page of the next physical segment + * start with first page of the next physical + * segment */ cl_index = 0; } @@ -2711,68 +2729,78 @@ pvs_cluster_read( */ page_list_count = 0; memory_object_super_upl_request(vs->vs_control, - (memory_object_offset_t)vs_offset, - xfer_size, xfer_size, - &upl, NULL, &page_list_count, - request_flags | UPL_SET_INTERNAL); + (memory_object_offset_t)vs_offset, + xfer_size, xfer_size, + &upl, NULL, &page_list_count, + request_flags | UPL_SET_INTERNAL); - error = ps_read_file(psp[beg_pseg], upl, (vm_offset_t) 0, - ps_offset[beg_pseg] + (beg_indx * vm_page_size), xfer_size, &residual, 0); + error = ps_read_file(psp[beg_pseg], + upl, (vm_offset_t) 0, + ps_offset[beg_pseg] + + (beg_indx * vm_page_size), + xfer_size, &residual, 0); } else continue; failed_size = 0; /* - * Adjust counts and send response to VM. Optimize for the - * common case, i.e. no error and/or partial data. - * If there was an error, then we need to error the entire - * range, even if some data was successfully read. - * If there was a partial read we may supply some + * Adjust counts and send response to VM. Optimize + * for the common case, i.e. no error and/or partial + * data. If there was an error, then we need to error + * the entire range, even if some data was successfully + * read. If there was a partial read we may supply some * data and may error some as well. In all cases the * VM must receive some notification for every page in the * range. */ if ((error == KERN_SUCCESS) && (residual == 0)) { /* - * Got everything we asked for, supply the data to - * the VM. Note that as a side effect of supplying - * the data, the buffer holding the supplied data is - * deallocated from the pager's address space. + * Got everything we asked for, supply the data + * to the VM. Note that as a side effect of + * supplying * the data, the buffer holding the + * supplied data is * deallocated from the pager's + * address space. */ - pvs_object_data_provided(vs, upl, vs_offset, xfer_size); + pvs_object_data_provided( + vs, upl, vs_offset, xfer_size); } else { failed_size = xfer_size; if (error == KERN_SUCCESS) { if (residual == xfer_size) { - /* - * If a read operation returns no error - * and no data moved, we turn it into - * an error, assuming we're reading at - * or beyong EOF. - * Fall through and error the entire - * range. - */ + /* + * If a read operation returns no error + * and no data moved, we turn it into + * an error, assuming we're reading at + * or beyong EOF. + * Fall through and error the entire + * range. + */ error = KERN_FAILURE; } else { - /* - * Otherwise, we have partial read. If - * the part read is a integral number - * of pages supply it. Otherwise round - * it up to a page boundary, zero fill - * the unread part, and supply it. - * Fall through and error the remainder - * of the range, if any. - */ + /* + * Otherwise, we have partial read. If + * the part read is a integral number + * of pages supply it. Otherwise round + * it up to a page boundary, zero fill + * the unread part, and supply it. + * Fall through and error the remainder + * of the range, if any. + */ int fill, lsize; - fill = residual & ~vm_page_size; - lsize = (xfer_size - residual) + fill; - pvs_object_data_provided(vs, upl, vs_offset, lsize); + fill = residual + & ~vm_page_size; + lsize = (xfer_size - residual) + + fill; + pvs_object_data_provided( + vs, upl, + vs_offset, lsize); if (lsize < xfer_size) { - failed_size = xfer_size - lsize; + failed_size = + xfer_size - lsize; error = KERN_FAILURE; } } @@ -2780,12 +2808,13 @@ pvs_cluster_read( } /* * If there was an error in any part of the range, tell - * the VM. Note that error is explicitly checked again since - * it can be modified above. + * the VM. Note that error is explicitly checked again + * since it can be modified above. */ if (error != KERN_SUCCESS) { BS_STAT(psp[beg_pseg]->ps_bs, - psp[beg_pseg]->ps_bs->bs_pages_in_fail += atop(failed_size)); + psp[beg_pseg]->ps_bs->bs_pages_in_fail + += atop(failed_size)); } size -= xfer_size; vs_offset += xfer_size; @@ -2869,12 +2898,14 @@ vs_cluster_write( pl = UPL_GET_INTERNAL_PAGE_LIST(upl); - for (seg_index = 0, transfer_size = upl->size; transfer_size > 0; ) { + for (seg_index = 0, transfer_size = upl->size; + transfer_size > 0; ) { - ps_offset[seg_index] = ps_clmap(vs, upl->offset + (seg_index * cl_size), - &clmap, CL_ALLOC, - transfer_size < cl_size ? - transfer_size : cl_size, 0); + ps_offset[seg_index] = + ps_clmap(vs, upl->offset + (seg_index * cl_size), + &clmap, CL_ALLOC, + transfer_size < cl_size ? + transfer_size : cl_size, 0); if (ps_offset[seg_index] == (vm_offset_t) -1) { upl_abort(upl, 0); @@ -2891,21 +2922,25 @@ vs_cluster_write( } else transfer_size = 0; } - for (page_index = 0, num_of_pages = upl->size / vm_page_size; page_index < num_of_pages; ) { + for (page_index = 0, + num_of_pages = upl->size / vm_page_size; + page_index < num_of_pages; ) { /* * skip over non-dirty pages */ for ( ; page_index < num_of_pages; page_index++) { - if (UPL_DIRTY_PAGE(pl, page_index) || UPL_PRECIOUS_PAGE(pl, page_index)) + if (UPL_DIRTY_PAGE(pl, page_index) + || UPL_PRECIOUS_PAGE(pl, page_index)) /* * this is a page we need to write - * go see if we can buddy it up with others - * that are contiguous to it + * go see if we can buddy it up with + * others that are contiguous to it */ break; /* - * if the page is not-dirty, but present we need to commit it... - * this is an unusual case since we only asked for dirty pages + * if the page is not-dirty, but present we + * need to commit it... This is an unusual + * case since we only asked for dirty pages */ if (UPL_PAGE_PRESENT(pl, page_index)) { boolean_t empty = FALSE; @@ -2927,14 +2962,16 @@ vs_cluster_write( break; /* - * gather up contiguous dirty pages... we have at least 1 - * otherwise we would have bailed above + * gather up contiguous dirty pages... we have at + * least 1 otherwise we would have bailed above * make sure that each physical segment that we step * into is contiguous to the one we're currently in * if it's not, we have to stop and write what we have */ - for (first_dirty = page_index; page_index < num_of_pages; ) { - if ( !UPL_DIRTY_PAGE(pl, page_index) && !UPL_PRECIOUS_PAGE(pl, page_index)) + for (first_dirty = page_index; + page_index < num_of_pages; ) { + if ( !UPL_DIRTY_PAGE(pl, page_index) + && !UPL_PRECIOUS_PAGE(pl, page_index)) break; page_index++; /* @@ -2946,17 +2983,21 @@ vs_cluster_write( int cur_seg; int nxt_seg; - cur_seg = (page_index - 1) / pages_in_cl; + cur_seg = + (page_index - 1) / pages_in_cl; nxt_seg = page_index / pages_in_cl; if (cur_seg != nxt_seg) { if ((ps_offset[cur_seg] != (ps_offset[nxt_seg] - cl_size)) || (psp[cur_seg] != psp[nxt_seg])) - /* - * if the segment we're about to step into - * is not contiguous to the one we're currently - * in, or it's in a different paging file.... - * we stop here and generate the I/O - */ + /* + * if the segment we're about + * to step into is not + * contiguous to the one we're + * currently in, or it's in a + * different paging file.... + * we stop here and generate + * the I/O + */ break; } } @@ -2970,22 +3011,29 @@ vs_cluster_write( seg_offset = upl_offset - (seg_index * cl_size); transfer_size = num_dirty * vm_page_size; - error = ps_write_file(psp[seg_index], upl, upl_offset, - ps_offset[seg_index] + seg_offset, transfer_size, flags); - if (error == 0) { - while (transfer_size) { - int seg_size; + while (transfer_size) { + int seg_size; - if ((seg_size = cl_size - (upl_offset % cl_size)) > transfer_size) - seg_size = transfer_size; + if ((seg_size = cl_size - + (upl_offset % cl_size)) + > transfer_size) + seg_size = transfer_size; - ps_vs_write_complete(vs, upl->offset + upl_offset, seg_size, error); + ps_vs_write_complete(vs, + upl->offset + upl_offset, + seg_size, error); - transfer_size -= seg_size; - upl_offset += seg_size; - } + transfer_size -= seg_size; + upl_offset += seg_size; } + upl_offset = first_dirty * vm_page_size; + transfer_size = num_dirty * vm_page_size; + error = ps_write_file(psp[seg_index], + upl, upl_offset, + ps_offset[seg_index] + + seg_offset, + transfer_size, flags); must_abort = 0; } if (must_abort) { @@ -3028,14 +3076,14 @@ vs_cluster_write( /* Assume that the caller has given us contiguous */ /* pages */ if(cnt) { + ps_vs_write_complete(vs, mobj_target_addr, + cnt, error); error = ps_write_file(ps, internal_upl, 0, actual_offset, cnt, flags); if (error) break; - ps_vs_write_complete(vs, mobj_target_addr, - cnt, error); - } + } if (error) break; actual_offset += cnt;