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drivers/mtd: Add support for /dev/smart loop device. From Ken Petit

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This commit is contained in:
Ken Pettit
2015-11-28 09:00:26 -06:00
committed by Gregory Nutt
parent 1f8f097783
commit 5821af1bbe
7 changed files with 393 additions and 19 deletions
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drivers/mtd/filemtd.c
+62 -16
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@@ -95,10 +95,12 @@
struct file_dev_s
{
struct mtd_dev_s mtd; /* MTD device */
int fd; /* File descriptor of underlying file */
size_t nblocks; /* Number of erase blocks */
size_t offset; /* Offset from start of file */
struct mtd_dev_s mtd; /* MTD device */
int fd; /* File descriptor of underlying file */
size_t nblocks; /* Number of erase blocks */
size_t offset; /* Offset from start of file */
size_t erasesize; /* Offset from start of file */
size_t blocksize; /* Offset from start of file */
};
/****************************************************************************
@@ -270,8 +272,8 @@ static int file_erase(FAR struct mtd_dev_s *dev, off_t startblock,
* corresponding to the number of blocks.
*/
offset = startblock * CONFIG_FILEMTD_BLOCKSIZE;
nbytes = nblocks * CONFIG_FILEMTD_BLOCKSIZE;
offset = startblock * priv->blocksize;
nbytes = nblocks * priv->blocksize;
/* Then erase the data in the file */
@@ -317,8 +319,8 @@ static ssize_t file_bread(FAR struct mtd_dev_s *dev, off_t startblock,
* corresponding to the number of blocks.
*/
offset = startblock * CONFIG_FILEMTD_BLOCKSIZE;
nbytes = nblocks * CONFIG_FILEMTD_BLOCKSIZE;
offset = startblock * priv->blocksize;
nbytes = nblocks * priv->blocksize;
/* Then read the data from the file */
@@ -357,8 +359,8 @@ static ssize_t file_bwrite(FAR struct mtd_dev_s *dev, off_t startblock,
* corresponding to the number of blocks.
*/
offset = startblock * CONFIG_FILEMTD_BLOCKSIZE;
nbytes = nblocks * CONFIG_FILEMTD_BLOCKSIZE;
offset = startblock * priv->blocksize;
nbytes = nblocks * priv->blocksize;
/* Then write the data to the file */
@@ -379,7 +381,7 @@ static ssize_t file_byteread(FAR struct mtd_dev_s *dev, off_t offset,
/* Don't let read read past end of buffer */
if (offset + nbytes > priv->nblocks * CONFIG_FILEMTD_ERASESIZE)
if (offset + nbytes > priv->nblocks * priv->erasesize)
{
return 0;
}
@@ -403,7 +405,7 @@ static ssize_t file_bytewrite(FAR struct mtd_dev_s *dev, off_t offset,
/* Don't let the write exceed the original size of the file */
maxoffset = priv->nblocks * CONFIG_FILEMTD_ERASESIZE;
maxoffset = priv->nblocks * priv->erasesize;
if (offset + nbytes > maxoffset)
{
return 0;
@@ -438,8 +440,8 @@ static int file_ioctl(FAR struct mtd_dev_s *dev, int cmd, unsigned long arg)
* the capacity and how to access the device.
*/
geo->blocksize = CONFIG_FILEMTD_BLOCKSIZE;
geo->erasesize = CONFIG_FILEMTD_ERASESIZE;
geo->blocksize = priv->blocksize;
geo->erasesize = priv->erasesize;
geo->neraseblocks = priv->nblocks;
ret = OK;
}
@@ -482,7 +484,8 @@ static int file_ioctl(FAR struct mtd_dev_s *dev, int cmd, unsigned long arg)
*
****************************************************************************/
FAR struct mtd_dev_s *filemtd_initialize(FAR const char *path, size_t offset)
FAR struct mtd_dev_s *filemtd_initialize(FAR const char *path, size_t offset,
int16_t sectsize, int32_t erasesize)
{
FAR struct file_dev_s *priv;
struct stat sb;
@@ -527,9 +530,31 @@ FAR struct mtd_dev_s *filemtd_initialize(FAR const char *path, size_t offset)
return NULL;
}
/* Set the block size based on the provided sectsize parameter */
if (sectsize <= 0)
{
priv->blocksize = CONFIG_FILEMTD_BLOCKSIZE;
}
else
{
priv->blocksize = sectsize;
}
/* Set the erase size based on the provided erasesize parameter */
if (erasesize <= 0)
{
priv->erasesize = CONFIG_FILEMTD_ERASESIZE;
}
else
{
priv->erasesize = erasesize;
}
/* Force the size to be an even number of the erase block size */
nblocks = (filelen - offset) / CONFIG_FILEMTD_ERASESIZE;
nblocks = (filelen - offset) / priv->erasesize;
if (nblocks < 3)
{
fdbg("Need to provide at least three full erase block\n");
@@ -591,3 +616,24 @@ void filemtd_teardown(FAR struct mtd_dev_s *dev)
kmm_free(priv);
}
/****************************************************************************
* Name: filemtd_isfilemtd
*
* Description:
* Tests if the provided mtd is a filemtd device.
*
* Input Parameters:
* mtd - Pointer to the mtd.
*
****************************************************************************/
bool filemtd_isfilemtd(FAR struct mtd_dev_s *dev)
{
FAR struct file_dev_s *priv = (FAR struct file_dev_s *) dev;
if (priv->mtd.erase == file_erase)
return 1;
return 0;
}