2 * io_manager.c --- the I/O manager abstraction
17 #include <sys/types.h>
23 errcode_t io_channel_set_options(io_channel channel, const char *opts)
26 char *next, *ptr, *options, *arg;
28 EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
33 if (!channel->manager->set_option)
34 return EXT2_ET_INVALID_ARGUMENT;
36 options = malloc(strlen(opts)+1);
38 return EXT2_ET_NO_MEMORY;
39 strcpy(options, opts);
43 next = strchr(ptr, '&');
47 arg = strchr(ptr, '=');
51 retval = (channel->manager->set_option)(channel, ptr, arg);
60 errcode_t io_channel_write_byte(io_channel channel, unsigned long offset,
61 int count, const void *data)
63 EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
65 if (channel->manager->write_byte)
66 return channel->manager->write_byte(channel, offset,
69 return EXT2_ET_UNIMPLEMENTED;
72 errcode_t io_channel_read_blk64(io_channel channel, unsigned long long block,
73 int count, void *data)
75 EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
77 if (channel->manager->read_blk64)
78 return (channel->manager->read_blk64)(channel, block,
81 if ((block >> 32) != 0)
82 return EXT2_ET_IO_CHANNEL_NO_SUPPORT_64;
84 return (channel->manager->read_blk)(channel, (unsigned long) block,
88 errcode_t io_channel_write_blk64(io_channel channel, unsigned long long block,
89 int count, const void *data)
91 EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
93 if (channel->manager->write_blk64)
94 return (channel->manager->write_blk64)(channel, block,
97 if ((block >> 32) != 0)
98 return EXT2_ET_IO_CHANNEL_NO_SUPPORT_64;
100 return (channel->manager->write_blk)(channel, (unsigned long) block,
104 errcode_t io_channel_discard(io_channel channel, unsigned long long block,
105 unsigned long long count)
107 EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
109 if (channel->manager->discard)
110 return (channel->manager->discard)(channel, block, count);
112 return EXT2_ET_UNIMPLEMENTED;
115 errcode_t io_channel_zeroout(io_channel channel, unsigned long long block,
116 unsigned long long count)
118 EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
120 if (channel->manager->zeroout)
121 return (channel->manager->zeroout)(channel, block, count);
123 return EXT2_ET_UNIMPLEMENTED;
126 errcode_t io_channel_alloc_buf(io_channel io, int count, void *ptr)
131 size = io->block_size;
133 size = io->block_size * count;
138 return ext2fs_get_memalign(size, io->align, ptr);
140 return ext2fs_get_mem(size, ptr);
143 errcode_t io_channel_cache_readahead(io_channel io, unsigned long long block,
144 unsigned long long count)
146 if (!io->manager->cache_readahead)
147 return EXT2_ET_OP_NOT_SUPPORTED;
149 return io->manager->cache_readahead(io, block, count);