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79 lines
2.4 KiB
C
79 lines
2.4 KiB
C
/*
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* Copyright (C) 2011 Andrea Mazzoleni
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __PARITY_H
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#define __PARITY_H
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/****************************************************************************/
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/* parity */
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struct snapraid_parity {
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char path[PATH_MAX]; /**< Path of the file. */
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int f; /**< Handle of the file. */
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struct stat st; /**< Stat info of the opened file. */
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data_off_t valid_size; /**< Size of the valid data. */
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};
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/**
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* Computes the size of the parity data in number of blocks.
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*/
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block_off_t parity_size(struct snapraid_state* state);
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/**
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* Reports all the files outside the specified parity size.
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*/
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void parity_overflow(struct snapraid_state* state, data_off_t size);
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/**
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* Creates the parity file.
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* \param out_size Return the size of the parity file.
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*/
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int parity_create(struct snapraid_parity* parity, const char* path, data_off_t* out_size, int skip_sequential);
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/**
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* Changes the parity size.
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* \param out_size Return the size of the parity file. The out_size is set also on error to reflect a partial resize.
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*/
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int parity_chsize(struct snapraid_parity* parity, data_off_t size, data_off_t* out_size, int skip_fallocate);
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/**
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* Opens an already existing parity file.
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*/
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int parity_open(struct snapraid_parity* parity, const char* path, int skip_sequential);
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/**
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* Flushes the parity file in the disk.
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*/
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int parity_sync(struct snapraid_parity* parity);
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/**
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* Closes the parity file.
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*/
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int parity_close(struct snapraid_parity* parity);
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/**
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* Read a block from the parity file.
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*/
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int parity_read(struct snapraid_parity* parity, block_off_t pos, unsigned char* block_buffer, unsigned block_size, FILE* out);
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/**
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* Writes a block in the parity file.
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*/
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int parity_write(struct snapraid_parity* parity, block_off_t pos, unsigned char* block_buffer, unsigned block_size);
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#endif
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