153 lines
3.3 KiB
C
153 lines
3.3 KiB
C
/*
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* io_manager.c --- the I/O manager abstraction
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*/
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#include "config.h"
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#include <stdio.h>
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#include <string.h>
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#if HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include <fcntl.h>
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#include <time.h>
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#if HAVE_SYS_STAT_H
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#include <sys/stat.h>
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#endif
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#if HAVE_SYS_TYPES_H
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#include <sys/types.h>
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#endif
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#include "ext2_fs.h"
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#include "ext2fs.h"
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errcode_t io_channel_set_options(io_channel channel, const char *opts)
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{
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errcode_t retval = 0;
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char *next, *ptr, *options, *arg;
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EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
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if (!opts)
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return 0;
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if (!channel->manager->set_option)
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return EXT2_ET_INVALID_ARGUMENT;
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options = malloc(strlen(opts)+1);
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if (!options)
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return EXT2_ET_NO_MEMORY;
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strcpy(options, opts);
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ptr = options;
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while (ptr && *ptr) {
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next = strchr(ptr, '&');
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if (next)
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*next++ = 0;
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arg = strchr(ptr, '=');
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if (arg)
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*arg++ = 0;
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retval = (channel->manager->set_option)(channel, ptr, arg);
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if (retval)
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break;
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ptr = next;
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}
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free(options);
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return retval;
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}
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errcode_t io_channel_write_byte(io_channel channel, unsigned long offset,
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int count, const void *data)
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{
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EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
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if (channel->manager->write_byte)
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return channel->manager->write_byte(channel, offset,
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count, data);
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return EXT2_ET_UNIMPLEMENTED;
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}
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errcode_t io_channel_read_blk64(io_channel channel, unsigned long long block,
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int count, void *data)
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{
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EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
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if (channel->manager->read_blk64)
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return (channel->manager->read_blk64)(channel, block,
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count, data);
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if ((block >> 32) != 0)
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return EXT2_ET_IO_CHANNEL_NO_SUPPORT_64;
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return (channel->manager->read_blk)(channel, (unsigned long) block,
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count, data);
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}
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errcode_t io_channel_write_blk64(io_channel channel, unsigned long long block,
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int count, const void *data)
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{
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EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
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if (channel->manager->write_blk64)
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return (channel->manager->write_blk64)(channel, block,
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count, data);
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if ((block >> 32) != 0)
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return EXT2_ET_IO_CHANNEL_NO_SUPPORT_64;
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return (channel->manager->write_blk)(channel, (unsigned long) block,
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count, data);
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}
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errcode_t io_channel_discard(io_channel channel, unsigned long long block,
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unsigned long long count)
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{
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EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
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if (channel->manager->discard)
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return (channel->manager->discard)(channel, block, count);
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return EXT2_ET_UNIMPLEMENTED;
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}
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errcode_t io_channel_zeroout(io_channel channel, unsigned long long block,
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unsigned long long count)
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{
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EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
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if (channel->manager->zeroout)
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return (channel->manager->zeroout)(channel, block, count);
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return EXT2_ET_UNIMPLEMENTED;
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}
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errcode_t io_channel_alloc_buf(io_channel io, int count, void *ptr)
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{
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size_t size;
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if (count == 0)
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size = io->block_size;
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else if (count > 0)
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size = io->block_size * count;
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else
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size = -count;
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if (io->align) {
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if (io->align > size)
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size = io->align;
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return ext2fs_get_memalign(size, io->align, ptr);
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} else
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return ext2fs_get_mem(size, ptr);
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}
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errcode_t io_channel_cache_readahead(io_channel io, unsigned long long block,
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unsigned long long count)
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{
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if (!io->manager->cache_readahead)
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return EXT2_ET_OP_NOT_SUPPORTED;
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return io->manager->cache_readahead(io, block, count);
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}
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