89 lines
3.0 KiB
C
89 lines
3.0 KiB
C
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/*
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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 __HANDLE_H
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#define __HANDLE_H
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#include "state.h"
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#include "support.h"
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/****************************************************************************/
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/* handle */
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struct snapraid_handle {
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char path[PATH_MAX]; /**< Path of the file. */
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struct snapraid_disk* disk; /**< Disk of the file. */
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struct snapraid_file* file; /**< File opened. When the file is closed, it's set to 0. */
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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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struct advise_struct advise; /**< Advise information. */
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data_off_t valid_size; /**< Size of the valid data. */
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int created; /**< If the file was created, otherwise it was already existing. */
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};
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/**
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* Create a file.
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* The file is created if missing, and opened with write access.
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* If the file is created, the handle->created is set.
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* The initial size of the file is stored in the file->st struct.
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* If the file cannot be opened for write access, it's opened with read-only access.
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* The read-only access works only if the file has already the correct size and doesn't need to be modified.
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*/
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int handle_create(struct snapraid_handle* handle, struct snapraid_file* file, int mode);
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/**
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* Truncate a file if required.
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*/
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int handle_truncate(struct snapraid_handle* handle, struct snapraid_file* file);
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/**
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* Open a file.
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* The file is opened for reading.
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*/
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int handle_open(struct snapraid_handle* handle, struct snapraid_file* file, int mode, fptr* out, fptr* out_missing);
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/**
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* Close a file.
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*/
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int handle_close(struct snapraid_handle* handle);
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/**
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* Read a block from a file.
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* If the read block is shorter, it's padded with 0.
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*/
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int handle_read(struct snapraid_handle* handle, block_off_t file_pos, unsigned char* block_buffer, unsigned block_size, fptr* out, fptr* out_missing);
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/**
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* Write a block to a file.
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*/
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int handle_write(struct snapraid_handle* handle, block_off_t file_pos, unsigned char* block_buffer, unsigned block_size);
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/**
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* Change the modification time of the file to the saved value.
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*/
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int handle_utime(struct snapraid_handle* handle);
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/**
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* Map the unsorted list of disk to an ordered vector.
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* \param diskmax The size of the vector.
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* \return The allocated vector of pointers.
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*/
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struct snapraid_handle* handle_mapping(struct snapraid_state* state, unsigned* diskmax);
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#endif
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