| 1 | /*
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| 2 | * Copyright (c) 2011 Martin Sucha
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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 libext2
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| 30 | * @{
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| 31 | */
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| 32 | /**
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| 33 | * @file
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| 34 | */
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| 35 |
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| 36 | #include "libext2.h"
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| 37 | #include <errno.h>
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| 38 | #include <libblock.h>
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| 39 | #include <malloc.h>
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| 40 |
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| 41 | /**
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| 42 | * Initialize an instance of filesystem on the device.
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| 43 | * This function reads superblock from the device and
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| 44 | * initializes libblock cache with appropriate logical block size.
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| 45 | *
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| 46 | * @param fs Pointer to ext2_filesystem_t to initialize
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| 47 | * @param devmap_handle Device handle of the block device
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| 48 | */
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| 49 | int ext2_filesystem_init(ext2_filesystem_t *fs, devmap_handle_t devmap_handle)
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| 50 | {
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| 51 | int rc;
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| 52 | ext2_superblock_t *temp_superblock;
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| 53 | size_t block_size;
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| 54 |
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| 55 | fs->device = devmap_handle;
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| 56 |
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| 57 | rc = block_init(fs->device, 2048);
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| 58 | if (rc != EOK) {
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| 59 | return rc;
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| 60 | }
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| 61 |
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| 62 | rc = ext2_superblock_read_direct(fs->device, &temp_superblock);
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| 63 | if (rc != EOK) {
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| 64 | block_fini(fs->device);
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| 65 | return rc;
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| 66 | }
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| 67 |
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| 68 | block_size = ext2_superblock_get_block_size(temp_superblock);
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| 69 |
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| 70 | if (block_size > EXT2_MAX_BLOCK_SIZE) {
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| 71 | block_fini(fs->device);
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| 72 | return ENOTSUP;
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| 73 | }
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| 74 |
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| 75 | rc = block_cache_init(devmap_handle, block_size, 0, CACHE_MODE_WT);
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| 76 | if (rc != EOK) {
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| 77 | block_fini(fs->device);
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| 78 | return rc;
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| 79 | }
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| 80 |
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| 81 | fs->superblock = temp_superblock;
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| 82 |
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| 83 | return EOK;
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| 84 | }
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| 85 |
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| 86 | /**
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| 87 | * Finalize an instance of filesystem
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| 88 | *
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| 89 | * @param fs Pointer to ext2_filesystem_t to finalize
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| 90 | */
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| 91 | void ext2_filesystem_fini(ext2_filesystem_t *fs)
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| 92 | {
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| 93 | free(fs->superblock);
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| 94 | block_fini(fs->device);
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| 95 | }
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| 96 |
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| 97 |
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| 98 | /** @}
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| 99 | */
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