int nxffs_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
{
FAR struct nxffs_volume_s *volume;
int ret;
fvdbg("cmd: %d arg: %08lx\n", cmd, arg);
/* Sanity checks */
DEBUGASSERT(filep->f_priv != NULL && filep->f_inode != NULL);
/* Recover the file system state from the open file */
volume = filep->f_inode->i_private;
DEBUGASSERT(volume != NULL);
/* Get exclusive access to the volume. Note that the volume exclsem
* protects the open file list.
*/
ret = sem_wait(&volume->exclsem);
if (ret != OK)
{
ret = -errno;
fdbg("sem_wait failed: %d\n", ret);
goto errout;
}
/* Only a reformat and optimize commands are supported */
if (cmd == FIOC_REFORMAT)
{
fvdbg("Reformat command\n");
/* We cannot reformat the volume if there are any open inodes */
if (volume->ofiles)
{
fdbg("Open files\n");
ret = -EBUSY;
goto errout_with_semaphore;
}
/* Re-format the volume -- all is lost */
ret = nxffs_reformat(volume);
}
else if (cmd == FIOC_OPTIMIZE)
{
fvdbg("Optimize command\n");
/* Pack the volume */
ret = nxffs_pack(volume);
}
else
{
/* No other commands supported */
ret = -ENOTTY;
}
errout_with_semaphore:
sem_post(&volume->exclsem);
errout:
return ret;
}
int nxffs_initialize(FAR struct mtd_dev_s *mtd)
{
FAR struct nxffs_volume_s *volume;
struct nxffs_blkstats_s stats;
off_t threshold;
int ret;
/* If CONFIG_NXFFS_PREALLOCATED is defined, then this is the single, pre-
* allocated NXFFS volume instance.
*/
#ifdef CONFIG_NXFFS_PREALLOCATED
volume = &g_volume;
memset(volume, 0, sizeof(struct nxffs_volume_s));
#else
/* Allocate a NXFFS volume structure */
volume = (FAR struct nxffs_volume_s *)kzalloc(sizeof(struct nxffs_volume_s));
if (!volume)
{
ret = -ENOMEM;
goto errout;
}
#endif
/* Initialize the NXFFS volume structure */
volume->mtd = mtd;
volume->cblock = (off_t)-1;
sem_init(&volume->exclsem, 0, 1);
sem_init(&volume->wrsem, 0, 1);
/* Get the volume geometry. (casting to uintptr_t first eliminates
* complaints on some architectures where the sizeof long is different
* from the size of a pointer).
*/
ret = MTD_IOCTL(mtd, MTDIOC_GEOMETRY, (unsigned long)((uintptr_t)&volume->geo));
if (ret < 0)
{
fdbg("MTD ioctl(MTDIOC_GEOMETRY) failed: %d\n", -ret);
goto errout_with_volume;
}
/* Allocate one I/O block buffer to general files system access */
volume->cache = (FAR uint8_t *)kmalloc(volume->geo.blocksize);
if (!volume->cache)
{
fdbg("Failed to allocate an erase block buffer\n");
ret = -ENOMEM;
goto errout_with_volume;
}
/* Pre-allocate one, full, in-memory erase block. This is needed for filesystem
* packing (but is useful in other places as well). This buffer is not needed
* often, but is best to have pre-allocated and in-place.
*/
volume->pack = (FAR uint8_t *)kmalloc(volume->geo.erasesize);
if (!volume->pack)
{
fdbg("Failed to allocate an I/O block buffer\n");
ret = -ENOMEM;
goto errout_with_cache;
}
/* Get the number of R/W blocks per erase block and the total number o
* R/W blocks
*/
volume->blkper = volume->geo.erasesize / volume->geo.blocksize;
volume->nblocks = volume->geo.neraseblocks * volume->blkper;
DEBUGASSERT((off_t)volume->blkper * volume->geo.blocksize == volume->geo.erasesize);
/* Check if there is a valid NXFFS file system on the flash */
ret = nxffs_blockstats(volume, &stats);
if (ret < 0)
{
fdbg("Failed to collect block statistics: %d\n", -ret);
goto errout_with_buffer;
}
/* If the proportion of good blocks is low or the proportion of unformatted
* blocks is high, then reformat the FLASH.
*/
threshold = stats.nblocks / 5;
if (stats.ngood < threshold || stats.nunformat > threshold)
{
/* Reformat the volume */
ret = nxffs_reformat(volume);
if (ret < 0)
{
fdbg("Failed to reformat the volume: %d\n", -ret);
goto errout_with_buffer;
}
/* Get statistics on the re-formatted volume */
#if defined(CONFIG_DEBUG) && defined(CONFIG_DEBUG_FS)
ret = nxffs_blockstats(volume, &stats);
if (ret < 0)
{
fdbg("Failed to collect block statistics: %d\n", -ret);
goto errout_with_buffer;
}
#endif
}
/* Get the file system limits */
ret = nxffs_limits(volume);
if (ret == OK)
{
return OK;
}
fdbg("Failed to calculate file system limits: %d\n", -ret);
errout_with_buffer:
kfree(volume->pack);
errout_with_cache:
kfree(volume->cache);
errout_with_volume:
#ifndef CONFIG_NXFFS_PREALLOCATED
kfree(volume);
#endif
return ret;
}
