| 1 | /*
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| 2 | * Copyright (c) 2011 Maurizio Lombardi
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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 | #include <libfs.h>
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| 34 | #include <stdlib.h>
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| 35 | #include <libblock.h>
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| 36 | #include <errno.h>
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| 37 | #include <str.h>
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| 38 | #include "mfs_super.h"
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| 39 | #include "mfs_utils.h"
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| 40 | #include "../../vfs/vfs.h"
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| 41 |
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| 42 | static bool check_magic_number(int16_t magic, bool *native, mfs_version_t *version);
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| 43 |
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| 44 | void mfs_mounted(ipc_callid_t rid, ipc_call_t *request)
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| 45 | {
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| 46 | devmap_handle_t devmap_handle = (devmap_handle_t) IPC_GET_ARG1(*request);
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| 47 | enum cache_mode cmode;
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| 48 | struct mfs_superblock *sp;
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| 49 | bool native;
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| 50 | mfs_version_t version;
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| 51 |
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| 52 | /* Accept the mount options */
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| 53 | char *opts;
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| 54 | int rc = async_data_write_accept((void **) &opts, true, 0, 0, 0, NULL);
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| 55 |
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| 56 | if (rc != EOK) {
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| 57 | async_answer_0(rid, rc);
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| 58 | return;
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| 59 | }
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| 60 |
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| 61 | /* Check for option enabling write through. */
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| 62 | if (str_cmp(opts, "wtcache") == 0)
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| 63 | cmode = CACHE_MODE_WT;
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| 64 | else
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| 65 | cmode = CACHE_MODE_WB;
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| 66 |
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| 67 | free(opts);
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| 68 |
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| 69 | /* initialize libblock */
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| 70 | rc = block_init(devmap_handle, MFS_SUPER_BLOCK_SIZE);
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| 71 | if (rc != EOK) {
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| 72 | async_answer_0(rid, rc);
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| 73 | return;
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| 74 | }
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| 75 |
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| 76 | /* prepare the superblock */
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| 77 | rc = block_bb_read(devmap_handle, MFS_SUPER_BLOCK);
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| 78 | if (rc != EOK) {
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| 79 | block_fini(devmap_handle);
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| 80 | async_answer_0(rid, rc);
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| 81 | return;
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| 82 | }
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| 83 |
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| 84 | /* get the buffer with the superblock */
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| 85 | sp = block_bb_get(devmap_handle);
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| 86 |
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| 87 | if (!check_magic_number(sp->s_magic, &native, &version)) {
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| 88 | /*Magic number is invalid!*/
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| 89 | block_fini(devmap_handle);
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| 90 | async_answer_0(rid, ENOTSUP);
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| 91 | return;
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| 92 | }
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| 93 | }
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| 94 |
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| 95 | static bool check_magic_number(int16_t magic, bool *native, mfs_version_t *version)
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| 96 | {
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| 97 | *native = true;
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| 98 |
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| 99 | repeat_check:
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| 100 |
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| 101 | switch (*native ? magic : conv16(false, magic)) {
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| 102 | case MFS_MAGIC_V1:
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| 103 | *version = MFS_VERSION_V1;
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| 104 | return true;
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| 105 | case MFS_MAGIC_V2:
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| 106 | *version = MFS_VERSION_V2;
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| 107 | return true;
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| 108 | case MFS_MAGIC_V3:
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| 109 | *version = MFS_VERSION_V3;
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| 110 | return true;
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| 111 | default:
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| 112 | ;
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| 113 | }
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| 114 |
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| 115 | if (*native) {
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| 116 | *native = false;
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| 117 | goto repeat_check;
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| 118 | } else {
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| 119 | return false;
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| 120 | }
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| 121 |
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| 122 | /*Should never happens*/
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| 123 | return false;
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| 124 | }
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| 125 |
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| 126 |
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| 127 | /**
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| 128 | * @}
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| 129 | */
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| 130 |
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