void io_destroy_cache(io_channel *channel)
{
if (channel->io_cache) {
io_free_cache(channel->io_cache);
channel->io_cache = NULL;
}
}
void io_destroy_cache(io_channel *channel)
{
if (channel->io_cache) {
if (!--channel->io_cache->ic_use_count)
io_free_cache(channel->io_cache);
channel->io_cache = NULL;
}
}
errcode_t io_init_cache(io_channel *channel, size_t nr_blocks)
{
int i;
struct io_cache *ic;
char *dbuf;
struct io_cache_block *icb_list;
errcode_t ret;
ret = ocfs2_malloc0(sizeof(struct io_cache), &ic);
if (ret)
goto out;
ic->ic_nr_blocks = nr_blocks;
ic->ic_lookup = RB_ROOT;
INIT_LIST_HEAD(&ic->ic_lru);
ret = ocfs2_malloc_blocks(channel, nr_blocks, &ic->ic_data_buffer);
if (ret)
goto out;
ic->ic_data_buffer_len = (unsigned long)nr_blocks * channel->io_blksize;
ret = ocfs2_malloc0(sizeof(struct io_cache_block) * nr_blocks,
&ic->ic_metadata_buffer);
if (ret)
goto out;
ic->ic_metadata_buffer_len =
(unsigned long)nr_blocks * sizeof(struct io_cache_block);
icb_list = ic->ic_metadata_buffer;
dbuf = ic->ic_data_buffer;
for (i = 0; i < nr_blocks; i++) {
icb_list[i].icb_blkno = UINT64_MAX;
icb_list[i].icb_buf = dbuf;
dbuf += channel->io_blksize;
list_add_tail(&icb_list[i].icb_list, &ic->ic_lru);
}
ic->ic_use_count = 1;
channel->io_cache = ic;
out:
if (ret)
io_free_cache(ic);
return ret;
}