| 1 | /*
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| 2 | * Copyright (c) 2016 Jakub Jermar
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | /** @addtogroup fs
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| 30 | * @{
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| 31 | */
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| 32 |
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| 33 | /**
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| 34 | * @file vfs_pager.c
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| 35 | * @brief VFS pager operations.
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| 36 | */
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| 37 |
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| 38 | #include "vfs.h"
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| 39 | #include <async.h>
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| 40 | #include <fibril_synch.h>
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| 41 | #include <errno.h>
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| 42 | #include <as.h>
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| 43 |
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| 44 | void vfs_page_in(cap_call_handle_t rid, ipc_call_t *request)
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| 45 | {
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| 46 | aoff64_t offset = IPC_GET_ARG1(*request);
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| 47 | size_t page_size = IPC_GET_ARG2(*request);
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| 48 | int fd = IPC_GET_ARG3(*request);
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| 49 | void *page;
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| 50 | errno_t rc;
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| 51 |
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| 52 | page = as_area_create(AS_AREA_ANY, page_size,
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| 53 | AS_AREA_READ | AS_AREA_WRITE | AS_AREA_CACHEABLE,
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| 54 | AS_AREA_UNPAGED);
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| 55 |
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| 56 | if (page == AS_MAP_FAILED) {
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| 57 | async_answer_0(rid, ENOMEM);
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| 58 | return;
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| 59 | }
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| 60 |
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| 61 | rdwr_io_chunk_t chunk = {
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| 62 | .buffer = page,
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| 63 | .size = page_size
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| 64 | };
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| 65 |
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| 66 | size_t total = 0;
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| 67 | aoff64_t pos = offset;
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| 68 | do {
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| 69 | rc = vfs_rdwr_internal(fd, pos, true, &chunk);
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| 70 | if (rc != EOK)
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| 71 | break;
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| 72 | if (chunk.size == 0)
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| 73 | break;
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| 74 | total += chunk.size;
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| 75 | pos += chunk.size;
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| 76 | chunk.buffer += chunk.size;
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| 77 | chunk.size = page_size - total;
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| 78 | } while (total < page_size);
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| 79 |
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| 80 | async_answer_1(rid, rc, (sysarg_t) page);
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| 81 |
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| 82 | /*
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| 83 | * FIXME:
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| 84 | * This is just for now until we implement proper page cache
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| 85 | * management. Not keeping the pages around in a cache results in
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| 86 | * inherently non-coherent private mappings.
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| 87 | */
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| 88 | as_area_destroy(page);
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| 89 | }
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| 90 |
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| 91 | /**
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| 92 | * @}
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| 93 | */
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