fs:ext4:fix: Fixes for ext4write command

index 06536ba..80b3b90 100644
@@ -40,6 +40,7 @@
 #include <linux/stat.h>
 #include <linux/time.h>
 #include <asm/byteorder.h>
+#include <div64.h>
 #include "ext4_common.h"
 
 int ext4fs_symlinknest;

@@ -1051,8 +1052,8 @@ int ext4fs_write(const char *fname, unsigned char *buffer,
 	}
 	/* calucalate how many blocks required */
 	bytes_reqd_for_file = sizebytes;
-	blks_reqd_for_file = bytes_reqd_for_file / fs->blksz;
-	if (bytes_reqd_for_file % fs->blksz != 0) {
+	blks_reqd_for_file = lldiv(bytes_reqd_for_file, fs->blksz);
+	if (do_div(bytes_reqd_for_file, fs->blksz) != 0) {
 		blks_reqd_for_file++;
 		debug("total bytes for a file %u\n", blks_reqd_for_file);
 	}

index 1596a92..464a67d 100644
@@ -52,6 +52,7 @@ void ext4fs_set_blk_dev(block_dev_desc_t *rbdd, disk_partition_t *info)
 	part_info = info;
 	part_offset = info->start;
 	get_fs()->total_sect = (info->size * info->blksz) / SECTOR_SIZE;
+	get_fs()->dev_desc = rbdd;
 }
 
 int ext4fs_devread(int sector, int byte_offset, int byte_len, char *buf)

index 323875f..f12b805 100644
@@ -378,7 +378,6 @@ void ext4fs_update_parent_dentry(char *filename, int *p_ino, int file_type)
 	struct ext_filesystem *fs = get_fs();
 	/* directory entry */
 	struct ext2_dirent *dir;
-	char *ptr = NULL;
 	char *temp_dir = NULL;
 
 	zero_buffer = zalloc(fs->blksz);

@@ -415,7 +414,6 @@ restart:
 	if (ext4fs_log_journal(root_first_block_buffer, first_block_no_of_root))
 		goto fail;
 	dir = (struct ext2_dirent *)root_first_block_buffer;
-	ptr = (char *)dir;
 	totalbytes = 0;
 	while (dir->direntlen > 0) {
 		/*

@@ -483,14 +481,12 @@ restart:
 			break;
 
 		dir = (struct ext2_dirent *)((char *)dir + templength);
-		ptr = (char *)dir;
 	}
 
 	/* make a pointer ready for creating next directory entry */
 	templength = dir->direntlen;
 	totalbytes = totalbytes + templength;
 	dir = (struct ext2_dirent *)((char *)dir + templength);
-	ptr = (char *)dir;
 
 	/* get the next available inode number */
 	inodeno = ext4fs_get_new_inode_no();

@@ -1200,6 +1196,11 @@ static void alloc_double_indirect_block(struct ext2_inode *file_inode,
 		status = ext4fs_devread(di_blockno_parent *
 					fs->sect_perblk, 0,
 					fs->blksz, (char *)di_parent_buffer);
+
+		if (!status) {
+			printf("%s: Device read error!\n", __func__);
+			goto fail;
+		}
 		memset(di_parent_buffer, '\0', fs->blksz);
 
 		/*

@@ -1227,6 +1228,11 @@ static void alloc_double_indirect_block(struct ext2_inode *file_inode,
 						fs->sect_perblk, 0,
 						fs->blksz,
 						(char *)di_child_buff);
+
+			if (!status) {
+				printf("%s: Device read error!\n", __func__);
+				goto fail;
+			}
 			memset(di_child_buff, '\0', fs->blksz);
 			/* filling of actual datablocks for each child */
 			for (j = 0; j < (fs->blksz / sizeof(int)); j++) {

index 8a252d6..9f01708 100644
@@ -410,7 +410,7 @@ int ext4fs_check_journal_state(int recovery_flag)
 	int transaction_state = TRANSACTION_COMPLETE;
 	int prev_desc_logical_no = 0;
 	int curr_desc_logical_no = 0;
-	int ofs, flags, block;
+	int ofs, flags;
 	struct ext2_inode inode_journal;
 	struct journal_superblock_t *jsb = NULL;
 	struct journal_header_t *jdb = NULL;

@@ -453,7 +453,6 @@ int ext4fs_check_journal_state(int recovery_flag)
 
 	i = be32_to_cpu(jsb->s_first);
 	while (1) {
-		block = be32_to_cpu(jsb->s_first);
 		blknr = read_allocated_block(&inode_journal, i);
 		memset(temp_buff1, '\0', fs->blksz);
 		ext4fs_devread(blknr * fs->sect_perblk,

index 80b3b90..64d8a6d 100644
@@ -931,7 +931,6 @@ static int ext4fs_write_file(struct ext2_inode *file_inode,
 	int previous_block_number = -1;
 	int delayed_start = 0;
 	int delayed_extent = 0;
-	int delayed_skipfirst = 0;
 	int delayed_next = 0;
 	char *delayed_buf = NULL;
 

@@ -964,7 +963,6 @@ static int ext4fs_write_file(struct ext2_inode *file_inode,
 					previous_block_number = blknr;
 					delayed_start = blknr;
 					delayed_extent = blockend;
-					delayed_skipfirst = skipfirst;
 					delayed_buf = buf;
 					delayed_next = blknr +
 					    (blockend >> SECTOR_BITS);

@@ -973,7 +971,6 @@ static int ext4fs_write_file(struct ext2_inode *file_inode,
 				previous_block_number = blknr;
 				delayed_start = blknr;
 				delayed_extent = blockend;
-				delayed_skipfirst = skipfirst;
 				delayed_buf = buf;
 				delayed_next = blknr +
 				    (blockend >> SECTOR_BITS);

index 64d8a6d..f02c215 100644
@@ -1011,8 +1011,6 @@ int ext4fs_write(const char *fname, unsigned char *buffer,
 	unsigned int blks_reqd_for_file;
 	unsigned int blocks_remaining;
 	int existing_file_inodeno;
-	char filename[256];
-
 	char *temp_ptr = NULL;
 	long int itable_blkno;
 	long int parent_itable_blkno;

@@ -1021,6 +1019,9 @@ int ext4fs_write(const char *fname, unsigned char *buffer,
 	unsigned int inodes_per_block;
 	unsigned int ibmap_idx;
 	struct ext_filesystem *fs = get_fs();
+	ALLOC_CACHE_ALIGN_BUFFER(char, filename, 256);
+	memset(filename, 0x00, sizeof(filename));
+
 	g_parent_inode = zalloc(sizeof(struct ext2_inode));
 	if (!g_parent_inode)
 		goto fail;