void rwb_uninitialize(FAR struct rwbuffer_s *rwb)
{
#ifdef CONFIG_DRVR_WRITEBUFFER
if (rwb->wrmaxblocks > 0)
{
rwb_wrcanceltimeout(rwb);
sem_destroy(&rwb->wrsem);
if (rwb->wrbuffer)
{
kmm_free(rwb->wrbuffer);
}
}
#endif
#ifdef CONFIG_DRVR_READAHEAD
if (rhmaxblocks > 0)
{
sem_destroy(&rwb->rhsem);
if (rwb->rhbuffer)
{
kmm_free(rwb->rhbuffer);
}
}
#endif
}
static ssize_t rwb_writebuffer(FAR struct rwbuffer_s *rwb,
off_t startblock, uint32_t nblocks,
FAR const uint8_t *wrbuffer)
{
int ret;
/* Write writebuffer Logic */
rwb_wrcanceltimeout(rwb);
/* First: Should we flush out our cache? We would do that if (1) we already
* buffering blocks and the next block writing is not in the same sequence,
* or (2) the number of blocks would exceed our allocated buffer capacity
*/
if (((startblock != rwb->wrexpectedblock) && (rwb->wrnblocks)) ||
((rwb->wrnblocks + nblocks) > rwb->wrmaxblocks))
{
fvdbg("writebuffer miss, expected: %08x, given: %08x\n",
rwb->wrexpectedblock, startblock);
/* Flush the write buffer */
ret = rwb->wrflush(rwb, rwb->wrbuffer, rwb->wrblockstart, rwb->wrnblocks);
if (ret < 0)
{
fdbg("ERROR: Error writing multiple from cache: %d\n", -ret);
return ret;
}
rwb_resetwrbuffer(rwb);
}
/* writebuffer is empty? Then initialize it */
if (rwb->wrnblocks == 0)
{
fvdbg("Fresh cache starting at block: 0x%08x\n", startblock);
rwb->wrblockstart = startblock;
}
/* Add data to cache */
fvdbg("writebuffer: copying %d bytes from %p to %p\n",
nblocks * rwb->blocksize, wrbuffer,
&rwb->wrbuffer[rwb->wrnblocks * rwb->blocksize]);
memcpy(&rwb->wrbuffer[rwb->wrnblocks * rwb->blocksize],
wrbuffer, nblocks * rwb->blocksize);
rwb->wrnblocks += nblocks;
rwb->wrexpectedblock = rwb->wrblockstart + rwb->wrnblocks;
rwb_wrstarttimeout(rwb);
return nblocks;
}
void rwb_uninitialize(FAR struct rwbuffer_s *rwb)
{
#ifdef CONFIG_FS_WRITEBUFFER
rwb_wrcanceltimeout(rwb);
sem_destroy(&rwb->wrsem);
if (rwb->wrbuffer)
{
kfree(rwb->wrbuffer);
}
#endif
#ifdef CONFIG_FS_READAHEAD
sem_destroy(&rwb->rhsem);
if (rwb->rhbuffer)
{
kfree(rwb->rhbuffer);
}
#endif
}