68 lines
2.7 KiB
C
68 lines
2.7 KiB
C
/*
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* Copyright (c) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2009, 2013
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* The President and Fellows of Harvard College.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE UNIVERSITY AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE UNIVERSITY OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef FREEMAP_H
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#define FREEMAP_H
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/*
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* The freemap module accumulates information about the free block
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* bitmap as other checks are made, and then uses that information
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* to check and correct it.
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*/
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#include <stdint.h>
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typedef enum {
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B_SUPERBLOCK, /* Block that is the superblock */
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B_FREEMAPBLOCK, /* Block used by free-block bitmap */
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B_INODE, /* Block that is an inode */
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B_IBLOCK, /* Indirect (or doubly-indirect etc.) block */
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B_DIRDATA, /* Data block of a directory */
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B_DATA, /* Data block */
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B_PASTEND, /* Block off the end of the fs */
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} blockusage_t;
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/* Call this after loading the superblock but before doing any checks. */
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void freemap_setup(void);
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/* Call this to note that a block has been found in use. */
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void freemap_blockinuse(uint32_t block, blockusage_t how, uint32_t howdesc);
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/* Note that a block has been found where it should be dropped. */
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void freemap_blockfree(uint32_t block);
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/* Call this after all checks that call freemap_block{inuse,free}. */
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void freemap_check(void);
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/* Return the number of blocks in use. Valid after freemap_check(). */
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unsigned long freemap_blocksused(void);
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#endif /* FREEMAP_H */
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