98 lines
2.8 KiB
C
98 lines
2.8 KiB
C
/*
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* Copyright (c) 2015 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* filesystem.c
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* Filesystem abstraction.
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*/
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <errno.h>
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#include <stdbool.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <mount/biosboot.h>
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#include <mount/blockdevice.h>
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#include <mount/ext2.h>
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#include <mount/extended.h>
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#include <mount/filesystem.h>
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#include <mount/partition.h>
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const char* filesystem_error_string(enum filesystem_error error)
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{
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switch ( error )
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{
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case FILESYSTEM_ERROR_NONE:
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break;
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case FILESYSTEM_ERROR_ABSENT:
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return "No filesystem found";
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case FILESYSTEM_ERROR_UNRECOGNIZED:
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return "Unrecognized filesystem type";
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case FILESYSTEM_ERROR_ERRNO:
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return (const char*) strerror(errno);
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}
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return "Unknown error condition";
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}
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static const struct filesystem_handler* filesystem_handlers[] =
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{
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&biosboot_handler,
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&extended_handler,
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&ext2_handler,
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NULL,
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};
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void filesystem_release(struct filesystem* fs)
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{
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if ( !fs || !fs->handler )
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return;
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fs->handler->release(fs);
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}
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enum filesystem_error
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blockdevice_inspect_filesystem(struct filesystem** fs_ptr,
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struct blockdevice* bdev)
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{
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*fs_ptr = NULL;
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size_t leading_size = 65536;
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for ( size_t i = 0; filesystem_handlers[i]; i++ )
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{
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size_t amount = filesystem_handlers[i]->probe_amount(bdev);
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if ( leading_size < amount )
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leading_size = amount;
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}
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unsigned char* leading = (unsigned char*) malloc(leading_size);
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if ( !leading )
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return *fs_ptr = NULL, FILESYSTEM_ERROR_ERRNO;
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size_t amount = blockdevice_preadall(bdev, leading, leading_size, 0);
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if ( amount < leading_size && errno != EEOF )
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return free(leading), *fs_ptr = NULL, FILESYSTEM_ERROR_ERRNO;
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for ( size_t i = 0; filesystem_handlers[i]; i++ )
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{
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if ( !filesystem_handlers[i]->probe(bdev, leading, amount) )
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continue;
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free(leading);
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return filesystem_handlers[i]->inspect(fs_ptr, bdev);
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}
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for ( size_t i = 0; i < amount; i++ )
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if ( !leading[i] )
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return free(leading), FILESYSTEM_ERROR_UNRECOGNIZED;
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return free(leading), FILESYSTEM_ERROR_ABSENT;
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}
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