fs/littlefs Reduced-internal-fragmentaion

Two changes are done for this to sync the behaviour between Dhara and littleFS
1) We change littlefs_blocksize from fs->geo.erasesize (128 KB) to fs->geo.blocksize(2 KB).
2) As we are reserving some sectors (pages) for dhara inside files
os/fs/driver/mtd/dhara/journal.c and os/fs/driver/mtd/dhara/map.c so
we are going to give total pages - reserved pages as available blocks
to Littlefs.

Signed-off-by: Aditya Singh <aditya.s4@samsung.com>
Signed-off-by: Aashish Lakhwara <aashish.l@samsung.com>

Author: singh-aditya-04

os/fs/driver/mtd/dhara.c

@@ -129,6 +129,16 @@ static const struct block_operations g_dhara_bops = {
  * Private Functions
  ****************************************************************************/
 
+int sectors_reduced(FAR struct inode *inode)
+{
+	FAR dhara_dev_t *dev;
+	dev = inode->i_private;
+
+	struct dhara_map *m = &dev->map;
+	int x = dhara_map_capacity(m);
+	return x;
+}
+
 static int dhara_convert_result(dhara_error_t err)
 {
 	switch (err) {

os/fs/driver/mtd/dhara/map.c

@@ -119,7 +119,7 @@ dhara_sector_t dhara_map_capacity(const struct dhara_map *m)
 {
 	const dhara_sector_t cap = dhara_journal_capacity(&m->journal);
 	const dhara_sector_t reserve = cap / (m->gc_ratio + 1);
-	const dhara_sector_t safety_margin = DHARA_MAX_RETRIES << m->journal.nand->log2_ppb;
+	const dhara_sector_t safety_margin = DHARA_MAX_RETRIES;
 
 	if (reserve + safety_margin >= cap) {
 		return 0;

os/fs/littlefs/lfs_vfs.c

@@ -156,6 +156,16 @@ const struct mountpt_operations littlefs_operations = {
 /****************************************************************************
  * Private Functions
  ****************************************************************************/
+extern int sectors_reduced(FAR struct inode *driver);
+int littlefs_blocks_reduced(FAR struct inode *driver)
+{
+	int available_sectors;
+
+	available_sectors = sectors_reduced(driver);
+	lldbg("available_sectors %lld \n", (long long)available_sectors);
+	return available_sectors;
+}
+
 
 /****************************************************************************
  * Name: littlefs_semtake
@@ -454,7 +464,6 @@ static int littlefs_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
 		else
 			ret = -ENOTTY;
 		}
-	}
 	return ret;
 }
 
@@ -957,7 +966,7 @@ static int littlefs_bind(FAR struct inode *driver, FAR const void *data, FAR voi
 	}
 
 	/* Initialize lfs_config structure */
-
+	int blocks_available = littlefs_blocks_reduced(driver);
 	fs->cfg.context = fs;
 	fs->cfg.read = littlefs_read_block;
 	fs->cfg.prog = littlefs_write_block;
@@ -969,8 +978,8 @@ static int littlefs_bind(FAR struct inode *driver, FAR const void *data, FAR voi
 #endif
 	fs->cfg.read_size = fs->geo.blocksize;
 	fs->cfg.prog_size = fs->geo.blocksize;
-	fs->cfg.block_size = fs->geo.erasesize;
-	fs->cfg.block_count = fs->geo.neraseblocks;
+	fs->cfg.block_size = fs->geo.blocksize;
+	fs->cfg.block_count = blocks_available-1;
 	fs->cfg.block_cycles = 500;
 	fs->cfg.cache_size = fs->geo.blocksize;
 	fs->cfg.lookahead_size = lfs_min(lfs_alignup(fs->cfg.block_count, 64) / 8, fs->cfg.read_size);