103 lines
2.9 KiB
C
103 lines
2.9 KiB
C
/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2015.
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This file is part of Sortix libmount.
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Sortix libmount is free software: you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by the
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Free Software Foundation, either version 3 of the License, or (at your
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option) any later version.
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Sortix libmount is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with Sortix libmount. If not, see <http://www.gnu.org/licenses/>.
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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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