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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@2228 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo 2009-11-05 20:16:15 +00:00
parent 6b2827a112
commit fcf4b9767c
1 changed files with 43 additions and 46 deletions
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89
drivers/rwbuffer.c
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@ -106,9 +106,8 @@ static void rwb_semtake(sem_t *sem)
* Name: rwb_overlap
****************************************************************************/
static inline boolean
rwb_overlap(off_t bufferstart1, size_t buffersize1,
off_t bufferstart2, size_t buffersize2)
static inline boolean rwb_overlap(off_t bufferstart1, size_t buffersize1,
off_t bufferstart2, size_t buffersize2)
{
off_t bufferend1 = bufferstart1 + buffersize1;
off_t bufferend2 = bufferstart2 + buffersize2;
@ -156,15 +155,15 @@ static void rwb_wrflush(struct rwbuffer_s *rwb)
if (rwb->wrnbytes)
{
fvdbg("Flushing: blockstart=0x%08lx nbytes=%d from buffer=%p",
(long)rwb->wrblockstart, (long)rwb->wrnbytes, (long)rwb->wrbuffer);
(long)rwb->wrblockstart, (long)rwb->wrnbytes, (long)rwb->wrbuffer);
/* Flush cache */
ret = rwb->wrflush(rwb->dev, rwb->wrbuffer, rwb->wrblockstart, rwb->wrnbytes);
if (ret < 0)
{
fdbg("ERROR: Error flushing write buffer: %d\n", -ret);
}
{
fdbg("ERROR: Error flushing write buffer: %d\n", -ret);
}
rwb_resetwrbuffer(rwb);
}
@ -237,16 +236,16 @@ static ssize_t rwb_writebuffer(FAR struct rwbuffer_s *rwb,
((rwb->wrnbytes + nbytes) > rwb->wrallocsize))
{
fvdbg("writebuffer miss, expected: 0x%08x, given: 0x%08x",
rwb->wrexpectedblock, startblock);
rwb->wrexpectedblock, startblock);
/* Flush cache */
ret = rwb->wrflush(rwb, rwb->wrbuffer, rwb->wrblockstart, rwb->wrnbytes);
if (ret < 0)
{
fdbg("ERROR: Error writing multiple from cache: %d\n", -ret);
{
fdbg("ERROR: Error writing multiple from cache: %d\n", -ret);
return ret;
}
}
rwb_resetwrbuffer(rwb);
}
@ -308,7 +307,7 @@ rwb_bufferread(struct rwbuffer_s *rwb, off_t startblock,
/* Get the byte address in the read-ahead buffer */
ubyte *pchBuffer = rwb->rhbuffer + dwStartByteOffset;
ubyte *pchBuffer = rwb->rhbuffer + dwStartByteOffset;
/* Copy the data from the read-ahead buffer into the IO buffer */
@ -507,51 +506,51 @@ int rwb_read(FAR struct rwbuffer_s *rwb, off_t startblock, uint32 blockcount,
/* Is there anything in the read-ahead buffer? */
if (rwb->rhnbytes > 0)
{
off_t startblock = startblock;
size_t nblocks = 0;
off_t bufferend;
{
off_t startblock = startblock;
size_t nblocks = 0;
off_t bufferend;
/* Loop for each block we find in the read-head buffer. Count the
* number of buffers that we can read from read-ahead buffer.
*/
/* Loop for each block we find in the read-head buffer. Count the
* number of buffers that we can read from read-ahead buffer.
*/
bufferend = rwb->rhblockstart + rwb->rhnbytes;
bufferend = rwb->rhblockstart + rwb->rhnbytes;
while ((startblock >= rwb->rhblockstart) &&
(startblock < bufferend) &&
(blockcount > 0))
{
/* This is one more that we will read from the read ahead buffer */
while ((startblock >= rwb->rhblockstart) &&
(startblock < bufferend) &&
(blockcount > 0))
{
/* This is one more that we will read from the read ahead buffer */
nblocks++;
nblocks++;
/* And one less that we will read from the media */
/* And one less that we will read from the media */
startblock++;
blockcount--;
}
startblock++;
blockcount--;
}
/* Then read the data from the read-ahead buffer */
/* Then read the data from the read-ahead buffer */
rwb_bufferread(rwb, startblock,
nblocks, &rdbuffer);
}
rwb_bufferread(rwb, startblock, nblocks, &rdbuffer);
}
/* If we did not get all of the data from the buffer, then we have to refill
* the buffer and try again.
*/
if (blockcount > 0)
{
int ret = rwb_rhreload(rwb, startblock);
if (ret < 0)
{
fdbg("ERROR: Failed to fill the read-ahead buffer: %d", -ret);
return ret;
}
}
{
int ret = rwb_rhreload(rwb, startblock);
if (ret < 0)
{
fdbg("ERROR: Failed to fill the read-ahead buffer: %d", -ret);
return ret;
}
}
}
rwb_semgive(&rwb->rhsem);
return 0;
#else
@ -576,9 +575,7 @@ int rwb_write(FAR struct rwbuffer_s *rwb, off_t startblock,
*/
rwb_semtake(&rwb->rhsem);
if (rwb_overlap(rwb->rhblockstart,
rwb->rhnbytes,
startblock, blockcount))
if (rwb_overlap(rwb->rhblockstart, rwb->rhnbytes, startblock, blockcount))
{
rwb_resetrhbuffer(rwb);
}
@ -588,7 +585,7 @@ int rwb_write(FAR struct rwbuffer_s *rwb, off_t startblock,
#ifdef CONFIG_FS_WRITEBUFFER
fvdbg("startblock=%d wrbuffer=%p", startblock, wrbuffer);
/* Use the block cache unless the buffer size is bigger than block cache */
/* Use the block cache unless the buffer size is bigger than block cache */
if (blockcount > rwb->wrallocsize)
{