Adding qemu as a submodule of KVMFORNFV

This Patch includes the changes to add qemu as a submodule to
kvmfornfv repo and make use of the updated latest qemu for the
execution of all testcase
Change-Id: I1280af507a857675c7f81d30c95255635667bdd7
Signed-off-by:RajithaY<rajithax.yerrumsetty@intel.com>

1 files changed, 0 insertions, 1106 deletions

diff --git a/qemu/roms/u-boot/fs/fat/fat_write.c b/qemu/roms/u-boot/fs/fat/fat_write.c
deleted file mode 100644
index ba7e3aeb0..000000000
--- a/qemu/roms/u-boot/fs/fat/fat_write.c
+++ /dev/null
@@ -1,1106 +0,0 @@
-/*
- * fat_write.c
- *
- * R/W (V)FAT 12/16/32 filesystem implementation by Donggeun Kim
- *
- * SPDX-License-Identifier:	GPL-2.0+
- */
-
-#include <common.h>
-#include <command.h>
-#include <config.h>
-#include <fat.h>
-#include <asm/byteorder.h>
-#include <part.h>
-#include <linux/ctype.h>
-#include "fat.c"
-
-static void uppercase(char *str, int len)
-{
-	int i;
-
-	for (i = 0; i < len; i++) {
-		*str = toupper(*str);
-		str++;
-	}
-}
-
-static int total_sector;
-static int disk_write(__u32 block, __u32 nr_blocks, void *buf)
-{
-	if (!cur_dev || !cur_dev->block_write)
-		return -1;
-
-	if (cur_part_info.start + block + nr_blocks >
-		cur_part_info.start + total_sector) {
-		printf("error: overflow occurs\n");
-		return -1;
-	}
-
-	return cur_dev->block_write(cur_dev->dev,
-			cur_part_info.start + block, nr_blocks,	buf);
-}
-
-/*
- * Set short name in directory entry
- */
-static void set_name(dir_entry *dirent, const char *filename)
-{
-	char s_name[VFAT_MAXLEN_BYTES];
-	char *period;
-	int period_location, len, i, ext_num;
-
-	if (filename == NULL)
-		return;
-
-	len = strlen(filename);
-	if (len == 0)
-		return;
-
-	strcpy(s_name, filename);
-	uppercase(s_name, len);
-
-	period = strchr(s_name, '.');
-	if (period == NULL) {
-		period_location = len;
-		ext_num = 0;
-	} else {
-		period_location = period - s_name;
-		ext_num = len - period_location - 1;
-	}
-
-	/* Pad spaces when the length of file name is shorter than eight */
-	if (period_location < 8) {
-		memcpy(dirent->name, s_name, period_location);
-		for (i = period_location; i < 8; i++)
-			dirent->name[i] = ' ';
-	} else if (period_location == 8) {
-		memcpy(dirent->name, s_name, period_location);
-	} else {
-		memcpy(dirent->name, s_name, 6);
-		dirent->name[6] = '~';
-		dirent->name[7] = '1';
-	}
-
-	if (ext_num < 3) {
-		memcpy(dirent->ext, s_name + period_location + 1, ext_num);
-		for (i = ext_num; i < 3; i++)
-			dirent->ext[i] = ' ';
-	} else
-		memcpy(dirent->ext, s_name + period_location + 1, 3);
-
-	debug("name : %s\n", dirent->name);
-	debug("ext : %s\n", dirent->ext);
-}
-
-static __u8 num_of_fats;
-/*
- * Write fat buffer into block device
- */
-static int flush_fat_buffer(fsdata *mydata)
-{
-	int getsize = FATBUFBLOCKS;
-	__u32 fatlength = mydata->fatlength;
-	__u8 *bufptr = mydata->fatbuf;
-	__u32 startblock = mydata->fatbufnum * FATBUFBLOCKS;
-
-	startblock += mydata->fat_sect;
-
-	if (getsize > fatlength)
-		getsize = fatlength;
-
-	/* Write FAT buf */
-	if (disk_write(startblock, getsize, bufptr) < 0) {
-		debug("error: writing FAT blocks\n");
-		return -1;
-	}
-
-	if (num_of_fats == 2) {
-		/* Update corresponding second FAT blocks */
-		startblock += mydata->fatlength;
-		if (disk_write(startblock, getsize, bufptr) < 0) {
-			debug("error: writing second FAT blocks\n");
-			return -1;
-		}
-	}
-
-	return 0;
-}
-
-/*
- * Get the entry at index 'entry' in a FAT (12/16/32) table.
- * On failure 0x00 is returned.
- * When bufnum is changed, write back the previous fatbuf to the disk.
- */
-static __u32 get_fatent_value(fsdata *mydata, __u32 entry)
-{
-	__u32 bufnum;
-	__u32 off16, offset;
-	__u32 ret = 0x00;
-	__u16 val1, val2;
-
-	if (CHECK_CLUST(entry, mydata->fatsize)) {
-		printf("Error: Invalid FAT entry: 0x%08x\n", entry);
-		return ret;
-	}
-
-	switch (mydata->fatsize) {
-	case 32:
-		bufnum = entry / FAT32BUFSIZE;
-		offset = entry - bufnum * FAT32BUFSIZE;
-		break;
-	case 16:
-		bufnum = entry / FAT16BUFSIZE;
-		offset = entry - bufnum * FAT16BUFSIZE;
-		break;
-	case 12:
-		bufnum = entry / FAT12BUFSIZE;
-		offset = entry - bufnum * FAT12BUFSIZE;
-		break;
-
-	default:
-		/* Unsupported FAT size */
-		return ret;
-	}
-
-	debug("FAT%d: entry: 0x%04x = %d, offset: 0x%04x = %d\n",
-	       mydata->fatsize, entry, entry, offset, offset);
-
-	/* Read a new block of FAT entries into the cache. */
-	if (bufnum != mydata->fatbufnum) {
-		int getsize = FATBUFBLOCKS;
-		__u8 *bufptr = mydata->fatbuf;
-		__u32 fatlength = mydata->fatlength;
-		__u32 startblock = bufnum * FATBUFBLOCKS;
-
-		if (getsize > fatlength)
-			getsize = fatlength;
-
-		fatlength *= mydata->sect_size;	/* We want it in bytes now */
-		startblock += mydata->fat_sect;	/* Offset from start of disk */
-
-		/* Write back the fatbuf to the disk */
-		if (mydata->fatbufnum != -1) {
-			if (flush_fat_buffer(mydata) < 0)
-				return -1;
-		}
-
-		if (disk_read(startblock, getsize, bufptr) < 0) {
-			debug("Error reading FAT blocks\n");
-			return ret;
-		}
-		mydata->fatbufnum = bufnum;
-	}
-
-	/* Get the actual entry from the table */
-	switch (mydata->fatsize) {
-	case 32:
-		ret = FAT2CPU32(((__u32 *) mydata->fatbuf)[offset]);
-		break;
-	case 16:
-		ret = FAT2CPU16(((__u16 *) mydata->fatbuf)[offset]);
-		break;
-	case 12:
-		off16 = (offset * 3) / 4;
-
-		switch (offset & 0x3) {
-		case 0:
-			ret = FAT2CPU16(((__u16 *) mydata->fatbuf)[off16]);
-			ret &= 0xfff;
-			break;
-		case 1:
-			val1 = FAT2CPU16(((__u16 *)mydata->fatbuf)[off16]);
-			val1 &= 0xf000;
-			val2 = FAT2CPU16(((__u16 *)mydata->fatbuf)[off16 + 1]);
-			val2 &= 0x00ff;
-			ret = (val2 << 4) | (val1 >> 12);
-			break;
-		case 2:
-			val1 = FAT2CPU16(((__u16 *)mydata->fatbuf)[off16]);
-			val1 &= 0xff00;
-			val2 = FAT2CPU16(((__u16 *)mydata->fatbuf)[off16 + 1]);
-			val2 &= 0x000f;
-			ret = (val2 << 8) | (val1 >> 8);
-			break;
-		case 3:
-			ret = FAT2CPU16(((__u16 *)mydata->fatbuf)[off16]);
-			ret = (ret & 0xfff0) >> 4;
-			break;
-		default:
-			break;
-		}
-		break;
-	}
-	debug("FAT%d: ret: %08x, entry: %08x, offset: %04x\n",
-	       mydata->fatsize, ret, entry, offset);
-
-	return ret;
-}
-
-/*
- * Set the file name information from 'name' into 'slotptr',
- */
-static int str2slot(dir_slot *slotptr, const char *name, int *idx)
-{
-	int j, end_idx = 0;
-
-	for (j = 0; j <= 8; j += 2) {
-		if (name[*idx] == 0x00) {
-			slotptr->name0_4[j] = 0;
-			slotptr->name0_4[j + 1] = 0;
-			end_idx++;
-			goto name0_4;
-		}
-		slotptr->name0_4[j] = name[*idx];
-		(*idx)++;
-		end_idx++;
-	}
-	for (j = 0; j <= 10; j += 2) {
-		if (name[*idx] == 0x00) {
-			slotptr->name5_10[j] = 0;
-			slotptr->name5_10[j + 1] = 0;
-			end_idx++;
-			goto name5_10;
-		}
-		slotptr->name5_10[j] = name[*idx];
-		(*idx)++;
-		end_idx++;
-	}
-	for (j = 0; j <= 2; j += 2) {
-		if (name[*idx] == 0x00) {
-			slotptr->name11_12[j] = 0;
-			slotptr->name11_12[j + 1] = 0;
-			end_idx++;
-			goto name11_12;
-		}
-		slotptr->name11_12[j] = name[*idx];
-		(*idx)++;
-		end_idx++;
-	}
-
-	if (name[*idx] == 0x00)
-		return 1;
-
-	return 0;
-/* Not used characters are filled with 0xff 0xff */
-name0_4:
-	for (; end_idx < 5; end_idx++) {
-		slotptr->name0_4[end_idx * 2] = 0xff;
-		slotptr->name0_4[end_idx * 2 + 1] = 0xff;
-	}
-	end_idx = 5;
-name5_10:
-	end_idx -= 5;
-	for (; end_idx < 6; end_idx++) {
-		slotptr->name5_10[end_idx * 2] = 0xff;
-		slotptr->name5_10[end_idx * 2 + 1] = 0xff;
-	}
-	end_idx = 11;
-name11_12:
-	end_idx -= 11;
-	for (; end_idx < 2; end_idx++) {
-		slotptr->name11_12[end_idx * 2] = 0xff;
-		slotptr->name11_12[end_idx * 2 + 1] = 0xff;
-	}
-
-	return 1;
-}
-
-static int is_next_clust(fsdata *mydata, dir_entry *dentptr);
-static void flush_dir_table(fsdata *mydata, dir_entry **dentptr);
-
-/*
- * Fill dir_slot entries with appropriate name, id, and attr
- * The real directory entry is returned by 'dentptr'
- */
-static void
-fill_dir_slot(fsdata *mydata, dir_entry **dentptr, const char *l_name)
-{
-	dir_slot *slotptr = (dir_slot *)get_contents_vfatname_block;
-	__u8 counter = 0, checksum;
-	int idx = 0, ret;
-	char s_name[16];
-
-	/* Get short file name and checksum value */
-	strncpy(s_name, (*dentptr)->name, 16);
-	checksum = mkcksum((*dentptr)->name, (*dentptr)->ext);
-
-	do {
-		memset(slotptr, 0x00, sizeof(dir_slot));
-		ret = str2slot(slotptr, l_name, &idx);
-		slotptr->id = ++counter;
-		slotptr->attr = ATTR_VFAT;
-		slotptr->alias_checksum = checksum;
-		slotptr++;
-	} while (ret == 0);
-
-	slotptr--;
-	slotptr->id |= LAST_LONG_ENTRY_MASK;
-
-	while (counter >= 1) {
-		if (is_next_clust(mydata, *dentptr)) {
-			/* A new cluster is allocated for directory table */
-			flush_dir_table(mydata, dentptr);
-		}
-		memcpy(*dentptr, slotptr, sizeof(dir_slot));
-		(*dentptr)++;
-		slotptr--;
-		counter--;
-	}
-
-	if (is_next_clust(mydata, *dentptr)) {
-		/* A new cluster is allocated for directory table */
-		flush_dir_table(mydata, dentptr);
-	}
-}
-
-static __u32 dir_curclust;
-
-/*
- * Extract the full long filename starting at 'retdent' (which is really
- * a slot) into 'l_name'. If successful also copy the real directory entry
- * into 'retdent'
- * If additional adjacent cluster for directory entries is read into memory,
- * then 'get_contents_vfatname_block' is copied into 'get_dentfromdir_block' and
- * the location of the real directory entry is returned by 'retdent'
- * Return 0 on success, -1 otherwise.
- */
-static int
-get_long_file_name(fsdata *mydata, int curclust, __u8 *cluster,
-	      dir_entry **retdent, char *l_name)
-{
-	dir_entry *realdent;
-	dir_slot *slotptr = (dir_slot *)(*retdent);
-	dir_slot *slotptr2 = NULL;
-	__u8 *buflimit = cluster + mydata->sect_size * ((curclust == 0) ?
-							PREFETCH_BLOCKS :
-							mydata->clust_size);
-	__u8 counter = (slotptr->id & ~LAST_LONG_ENTRY_MASK) & 0xff;
-	int idx = 0, cur_position = 0;
-
-	if (counter > VFAT_MAXSEQ) {
-		debug("Error: VFAT name is too long\n");
-		return -1;
-	}
-
-	while ((__u8 *)slotptr < buflimit) {
-		if (counter == 0)
-			break;
-		if (((slotptr->id & ~LAST_LONG_ENTRY_MASK) & 0xff) != counter)
-			return -1;
-		slotptr++;
-		counter--;
-	}
-
-	if ((__u8 *)slotptr >= buflimit) {
-		if (curclust == 0)
-			return -1;
-		curclust = get_fatent_value(mydata, dir_curclust);
-		if (CHECK_CLUST(curclust, mydata->fatsize)) {
-			debug("curclust: 0x%x\n", curclust);
-			printf("Invalid FAT entry\n");
-			return -1;
-		}
-
-		dir_curclust = curclust;
-
-		if (get_cluster(mydata, curclust, get_contents_vfatname_block,
-				mydata->clust_size * mydata->sect_size) != 0) {
-			debug("Error: reading directory block\n");
-			return -1;
-		}
-
-		slotptr2 = (dir_slot *)get_contents_vfatname_block;
-		while (counter > 0) {
-			if (((slotptr2->id & ~LAST_LONG_ENTRY_MASK)
-			    & 0xff) != counter)
-				return -1;
-			slotptr2++;
-			counter--;
-		}
-
-		/* Save the real directory entry */
-		realdent = (dir_entry *)slotptr2;
-		while ((__u8 *)slotptr2 > get_contents_vfatname_block) {
-			slotptr2--;
-			slot2str(slotptr2, l_name, &idx);
-		}
-	} else {
-		/* Save the real directory entry */
-		realdent = (dir_entry *)slotptr;
-	}
-
-	do {
-		slotptr--;
-		if (slot2str(slotptr, l_name, &idx))
-			break;
-	} while (!(slotptr->id & LAST_LONG_ENTRY_MASK));
-
-	l_name[idx] = '\0';
-	if (*l_name == DELETED_FLAG)
-		*l_name = '\0';
-	else if (*l_name == aRING)
-		*l_name = DELETED_FLAG;
-	downcase(l_name);
-
-	/* Return the real directory entry */
-	*retdent = realdent;
-
-	if (slotptr2) {
-		memcpy(get_dentfromdir_block, get_contents_vfatname_block,
-			mydata->clust_size * mydata->sect_size);
-		cur_position = (__u8 *)realdent - get_contents_vfatname_block;
-		*retdent = (dir_entry *) &get_dentfromdir_block[cur_position];
-	}
-
-	return 0;
-}
-
-/*
- * Set the entry at index 'entry' in a FAT (16/32) table.
- */
-static int set_fatent_value(fsdata *mydata, __u32 entry, __u32 entry_value)
-{
-	__u32 bufnum, offset;
-
-	switch (mydata->fatsize) {
-	case 32:
-		bufnum = entry / FAT32BUFSIZE;
-		offset = entry - bufnum * FAT32BUFSIZE;
-		break;
-	case 16:
-		bufnum = entry / FAT16BUFSIZE;
-		offset = entry - bufnum * FAT16BUFSIZE;
-		break;
-	default:
-		/* Unsupported FAT size */
-		return -1;
-	}
-
-	/* Read a new block of FAT entries into the cache. */
-	if (bufnum != mydata->fatbufnum) {
-		int getsize = FATBUFBLOCKS;
-		__u8 *bufptr = mydata->fatbuf;
-		__u32 fatlength = mydata->fatlength;
-		__u32 startblock = bufnum * FATBUFBLOCKS;
-
-		fatlength *= mydata->sect_size;
-		startblock += mydata->fat_sect;
-
-		if (getsize > fatlength)
-			getsize = fatlength;
-
-		if (mydata->fatbufnum != -1) {
-			if (flush_fat_buffer(mydata) < 0)
-				return -1;
-		}
-
-		if (disk_read(startblock, getsize, bufptr) < 0) {
-			debug("Error reading FAT blocks\n");
-			return -1;
-		}
-		mydata->fatbufnum = bufnum;
-	}
-
-	/* Set the actual entry */
-	switch (mydata->fatsize) {
-	case 32:
-		((__u32 *) mydata->fatbuf)[offset] = cpu_to_le32(entry_value);
-		break;
-	case 16:
-		((__u16 *) mydata->fatbuf)[offset] = cpu_to_le16(entry_value);
-		break;
-	default:
-		return -1;
-	}
-
-	return 0;
-}
-
-/*
- * Determine the entry value at index 'entry' in a FAT (16/32) table
- */
-static __u32 determine_fatent(fsdata *mydata, __u32 entry)
-{
-	__u32 next_fat, next_entry = entry + 1;
-
-	while (1) {
-		next_fat = get_fatent_value(mydata, next_entry);
-		if (next_fat == 0) {
-			set_fatent_value(mydata, entry, next_entry);
-			break;
-		}
-		next_entry++;
-	}
-	debug("FAT%d: entry: %08x, entry_value: %04x\n",
-	       mydata->fatsize, entry, next_entry);
-
-	return next_entry;
-}
-
-/*
- * Write at most 'size' bytes from 'buffer' into the specified cluster.
- * Return 0 on success, -1 otherwise.
- */
-static int
-set_cluster(fsdata *mydata, __u32 clustnum, __u8 *buffer,
-	     unsigned long size)
-{
-	int idx = 0;
-	__u32 startsect;
-
-	if (clustnum > 0)
-		startsect = mydata->data_begin +
-				clustnum * mydata->clust_size;
-	else
-		startsect = mydata->rootdir_sect;
-
-	debug("clustnum: %d, startsect: %d\n", clustnum, startsect);
-
-	if ((size / mydata->sect_size) > 0) {
-		if (disk_write(startsect, size / mydata->sect_size, buffer) < 0) {
-			debug("Error writing data\n");
-			return -1;
-		}
-	}
-
-	if (size % mydata->sect_size) {
-		__u8 tmpbuf[mydata->sect_size];
-
-		idx = size / mydata->sect_size;
-		buffer += idx * mydata->sect_size;
-		memcpy(tmpbuf, buffer, size % mydata->sect_size);
-
-		if (disk_write(startsect + idx, 1, tmpbuf) < 0) {
-			debug("Error writing data\n");
-			return -1;
-		}
-
-		return 0;
-	}
-
-	return 0;
-}
-
-/*
- * Find the first empty cluster
- */
-static int find_empty_cluster(fsdata *mydata)
-{
-	__u32 fat_val, entry = 3;
-
-	while (1) {
-		fat_val = get_fatent_value(mydata, entry);
-		if (fat_val == 0)
-			break;
-		entry++;
-	}
-
-	return entry;
-}
-
-/*
- * Write directory entries in 'get_dentfromdir_block' to block device
- */
-static void flush_dir_table(fsdata *mydata, dir_entry **dentptr)
-{
-	int dir_newclust = 0;
-
-	if (set_cluster(mydata, dir_curclust,
-		    get_dentfromdir_block,
-		    mydata->clust_size * mydata->sect_size) != 0) {
-		printf("error: wrinting directory entry\n");
-		return;
-	}
-	dir_newclust = find_empty_cluster(mydata);
-	set_fatent_value(mydata, dir_curclust, dir_newclust);
-	if (mydata->fatsize == 32)
-		set_fatent_value(mydata, dir_newclust, 0xffffff8);
-	else if (mydata->fatsize == 16)
-		set_fatent_value(mydata, dir_newclust, 0xfff8);
-
-	dir_curclust = dir_newclust;
-
-	if (flush_fat_buffer(mydata) < 0)
-		return;
-
-	memset(get_dentfromdir_block, 0x00,
-		mydata->clust_size * mydata->sect_size);
-
-	*dentptr = (dir_entry *) get_dentfromdir_block;
-}
-
-/*
- * Set empty cluster from 'entry' to the end of a file
- */
-static int clear_fatent(fsdata *mydata, __u32 entry)
-{
-	__u32 fat_val;
-
-	while (1) {
-		fat_val = get_fatent_value(mydata, entry);
-		if (fat_val != 0)
-			set_fatent_value(mydata, entry, 0);
-		else
-			break;
-
-		if (fat_val == 0xfffffff || fat_val == 0xffff)
-			break;
-
-		entry = fat_val;
-	}
-
-	/* Flush fat buffer */
-	if (flush_fat_buffer(mydata) < 0)
-		return -1;
-
-	return 0;
-}
-
-/*
- * Write at most 'maxsize' bytes from 'buffer' into
- * the file associated with 'dentptr'
- * Return the number of bytes read or -1 on fatal errors.
- */
-static int
-set_contents(fsdata *mydata, dir_entry *dentptr, __u8 *buffer,
-	      unsigned long maxsize)
-{
-	unsigned long filesize = FAT2CPU32(dentptr->size), gotsize = 0;
-	unsigned int bytesperclust = mydata->clust_size * mydata->sect_size;
-	__u32 curclust = START(dentptr);
-	__u32 endclust = 0, newclust = 0;
-	unsigned long actsize;
-
-	debug("Filesize: %ld bytes\n", filesize);
-
-	if (maxsize > 0 && filesize > maxsize)
-		filesize = maxsize;
-
-	debug("%ld bytes\n", filesize);
-
-	actsize = bytesperclust;
-	endclust = curclust;
-	do {
-		/* search for consecutive clusters */
-		while (actsize < filesize) {
-			newclust = determine_fatent(mydata, endclust);
-
-			if ((newclust - 1) != endclust)
-				goto getit;
-
-			if (CHECK_CLUST(newclust, mydata->fatsize)) {
-				debug("curclust: 0x%x\n", newclust);
-				debug("Invalid FAT entry\n");
-				return gotsize;
-			}
-			endclust = newclust;
-			actsize += bytesperclust;
-		}
-		/* actsize >= file size */
-		actsize -= bytesperclust;
-		/* set remaining clusters */
-		if (set_cluster(mydata, curclust, buffer, (int)actsize) != 0) {
-			debug("error: writing cluster\n");
-			return -1;
-		}
-
-		/* set remaining bytes */
-		gotsize += (int)actsize;
-		filesize -= actsize;
-		buffer += actsize;
-		actsize = filesize;
-
-		if (set_cluster(mydata, endclust, buffer, (int)actsize) != 0) {
-			debug("error: writing cluster\n");
-			return -1;
-		}
-		gotsize += actsize;
-
-		/* Mark end of file in FAT */
-		if (mydata->fatsize == 16)
-			newclust = 0xffff;
-		else if (mydata->fatsize == 32)
-			newclust = 0xfffffff;
-		set_fatent_value(mydata, endclust, newclust);
-
-		return gotsize;
-getit:
-		if (set_cluster(mydata, curclust, buffer, (int)actsize) != 0) {
-			debug("error: writing cluster\n");
-			return -1;
-		}
-		gotsize += (int)actsize;
-		filesize -= actsize;
-		buffer += actsize;
-
-		if (CHECK_CLUST(curclust, mydata->fatsize)) {
-			debug("curclust: 0x%x\n", curclust);
-			debug("Invalid FAT entry\n");
-			return gotsize;
-		}
-		actsize = bytesperclust;
-		curclust = endclust = newclust;
-	} while (1);
-}
-
-/*
- * Fill dir_entry
- */
-static void fill_dentry(fsdata *mydata, dir_entry *dentptr,
-	const char *filename, __u32 start_cluster, __u32 size, __u8 attr)
-{
-	if (mydata->fatsize == 32)
-		dentptr->starthi =
-			cpu_to_le16((start_cluster & 0xffff0000) >> 16);
-	dentptr->start = cpu_to_le16(start_cluster & 0xffff);
-	dentptr->size = cpu_to_le32(size);
-
-	dentptr->attr = attr;
-
-	set_name(dentptr, filename);
-}
-
-/*
- * Check whether adding a file makes the file system to
- * exceed the size of the block device
- * Return -1 when overflow occurs, otherwise return 0
- */
-static int check_overflow(fsdata *mydata, __u32 clustnum, unsigned long size)
-{
-	__u32 startsect, sect_num;
-
-	if (clustnum > 0) {
-		startsect = mydata->data_begin +
-				clustnum * mydata->clust_size;
-	} else {
-		startsect = mydata->rootdir_sect;
-	}
-
-	sect_num = size / mydata->sect_size;
-	if (size % mydata->sect_size)
-		sect_num++;
-
-	if (startsect + sect_num > cur_part_info.start + total_sector)
-		return -1;
-
-	return 0;
-}
-
-/*
- * Check if adding several entries exceed one cluster boundary
- */
-static int is_next_clust(fsdata *mydata, dir_entry *dentptr)
-{
-	int cur_position;
-
-	cur_position = (__u8 *)dentptr - get_dentfromdir_block;
-
-	if (cur_position >= mydata->clust_size * mydata->sect_size)
-		return 1;
-	else
-		return 0;
-}
-
-static dir_entry *empty_dentptr;
-/*
- * Find a directory entry based on filename or start cluster number
- * If the directory entry is not found,
- * the new position for writing a directory entry will be returned
- */
-static dir_entry *find_directory_entry(fsdata *mydata, int startsect,
-	char *filename, dir_entry *retdent, __u32 start)
-{
-	__u32 curclust = (startsect - mydata->data_begin) / mydata->clust_size;
-
-	debug("get_dentfromdir: %s\n", filename);
-
-	while (1) {
-		dir_entry *dentptr;
-
-		int i;
-
-		if (get_cluster(mydata, curclust, get_dentfromdir_block,
-			    mydata->clust_size * mydata->sect_size) != 0) {
-			printf("Error: reading directory block\n");
-			return NULL;
-		}
-
-		dentptr = (dir_entry *)get_dentfromdir_block;
-
-		dir_curclust = curclust;
-
-		for (i = 0; i < DIRENTSPERCLUST; i++) {
-			char s_name[14], l_name[VFAT_MAXLEN_BYTES];
-
-			l_name[0] = '\0';
-			if (dentptr->name[0] == DELETED_FLAG) {
-				dentptr++;
-				if (is_next_clust(mydata, dentptr))
-					break;
-				continue;
-			}
-			if ((dentptr->attr & ATTR_VOLUME)) {
-				if (vfat_enabled &&
-				    (dentptr->attr & ATTR_VFAT) &&
-				    (dentptr->name[0] & LAST_LONG_ENTRY_MASK)) {
-					get_long_file_name(mydata, curclust,
-						     get_dentfromdir_block,
-						     &dentptr, l_name);
-					debug("vfatname: |%s|\n", l_name);
-				} else {
-					/* Volume label or VFAT entry */
-					dentptr++;
-					if (is_next_clust(mydata, dentptr))
-						break;
-					continue;
-				}
-			}
-			if (dentptr->name[0] == 0) {
-				debug("Dentname == NULL - %d\n", i);
-				empty_dentptr = dentptr;
-				return NULL;
-			}
-
-			get_name(dentptr, s_name);
-
-			if (strcmp(filename, s_name)
-			    && strcmp(filename, l_name)) {
-				debug("Mismatch: |%s|%s|\n",
-					s_name, l_name);
-				dentptr++;
-				if (is_next_clust(mydata, dentptr))
-					break;
-				continue;
-			}
-
-			memcpy(retdent, dentptr, sizeof(dir_entry));
-
-			debug("DentName: %s", s_name);
-			debug(", start: 0x%x", START(dentptr));
-			debug(", size:  0x%x %s\n",
-			      FAT2CPU32(dentptr->size),
-			      (dentptr->attr & ATTR_DIR) ?
-			      "(DIR)" : "");
-
-			return dentptr;
-		}
-
-		/*
-		 * In FAT16/12, the root dir is locate before data area, shows
-		 * in following:
-		 * -------------------------------------------------------------
-		 * | Boot | FAT1 & 2 | Root dir | Data (start from cluster #2) |
-		 * -------------------------------------------------------------
-		 *
-		 * As a result if curclust is in Root dir, it is a negative
-		 * number or 0, 1.
-		 *
-		 */
-		if (mydata->fatsize != 32 && (int)curclust <= 1) {
-			/* Current clust is in root dir, set to next clust */
-			curclust++;
-			if ((int)curclust <= 1)
-				continue;	/* continue to find */
-
-			/* Reach the end of root dir */
-			empty_dentptr = dentptr;
-			return NULL;
-		}
-
-		curclust = get_fatent_value(mydata, dir_curclust);
-		if (IS_LAST_CLUST(curclust, mydata->fatsize)) {
-			empty_dentptr = dentptr;
-			return NULL;
-		}
-		if (CHECK_CLUST(curclust, mydata->fatsize)) {
-			debug("curclust: 0x%x\n", curclust);
-			debug("Invalid FAT entry\n");
-			return NULL;
-		}
-	}
-
-	return NULL;
-}
-
-static int do_fat_write(const char *filename, void *buffer,
-	unsigned long size)
-{
-	dir_entry *dentptr, *retdent;
-	__u32 startsect;
-	__u32 start_cluster;
-	boot_sector bs;
-	volume_info volinfo;
-	fsdata datablock;
-	fsdata *mydata = &datablock;
-	int cursect;
-	int ret = -1, name_len;
-	char l_filename[VFAT_MAXLEN_BYTES];
-	int write_size = size;
-
-	dir_curclust = 0;
-
-	if (read_bootsectandvi(&bs, &volinfo, &mydata->fatsize)) {
-		debug("error: reading boot sector\n");
-		return -1;
-	}
-
-	total_sector = bs.total_sect;
-	if (total_sector == 0)
-		total_sector = cur_part_info.size;
-
-	if (mydata->fatsize == 32)
-		mydata->fatlength = bs.fat32_length;
-	else
-		mydata->fatlength = bs.fat_length;
-
-	mydata->fat_sect = bs.reserved;
-
-	cursect = mydata->rootdir_sect
-		= mydata->fat_sect + mydata->fatlength * bs.fats;
-	num_of_fats = bs.fats;
-
-	mydata->sect_size = (bs.sector_size[1] << 8) + bs.sector_size[0];
-	mydata->clust_size = bs.cluster_size;
-
-	if (mydata->fatsize == 32) {
-		mydata->data_begin = mydata->rootdir_sect -
-					(mydata->clust_size * 2);
-	} else {
-		int rootdir_size;
-
-		rootdir_size = ((bs.dir_entries[1]  * (int)256 +
-				 bs.dir_entries[0]) *
-				 sizeof(dir_entry)) /
-				 mydata->sect_size;
-		mydata->data_begin = mydata->rootdir_sect +
-					rootdir_size -
-					(mydata->clust_size * 2);
-	}
-
-	mydata->fatbufnum = -1;
-	mydata->fatbuf = memalign(ARCH_DMA_MINALIGN, FATBUFSIZE);
-	if (mydata->fatbuf == NULL) {
-		debug("Error: allocating memory\n");
-		return -1;
-	}
-
-	if (disk_read(cursect,
-		(mydata->fatsize == 32) ?
-		(mydata->clust_size) :
-		PREFETCH_BLOCKS, do_fat_read_at_block) < 0) {
-		debug("Error: reading rootdir block\n");
-		goto exit;
-	}
-	dentptr = (dir_entry *) do_fat_read_at_block;
-
-	name_len = strlen(filename);
-	if (name_len >= VFAT_MAXLEN_BYTES)
-		name_len = VFAT_MAXLEN_BYTES - 1;
-
-	memcpy(l_filename, filename, name_len);
-	l_filename[name_len] = 0; /* terminate the string */
-	downcase(l_filename);
-
-	startsect = mydata->rootdir_sect;
-	retdent = find_directory_entry(mydata, startsect,
-				l_filename, dentptr, 0);
-	if (retdent) {
-		/* Update file size and start_cluster in a directory entry */
-		retdent->size = cpu_to_le32(size);
-		start_cluster = FAT2CPU16(retdent->start);
-		if (mydata->fatsize == 32)
-			start_cluster |=
-				(FAT2CPU16(retdent->starthi) << 16);
-
-		ret = check_overflow(mydata, start_cluster, size);
-		if (ret) {
-			printf("Error: %ld overflow\n", size);
-			goto exit;
-		}
-
-		ret = clear_fatent(mydata, start_cluster);
-		if (ret) {
-			printf("Error: clearing FAT entries\n");
-			goto exit;
-		}
-
-		ret = set_contents(mydata, retdent, buffer, size);
-		if (ret < 0) {
-			printf("Error: writing contents\n");
-			goto exit;
-		}
-		write_size = ret;
-		debug("attempt to write 0x%x bytes\n", write_size);
-
-		/* Flush fat buffer */
-		ret = flush_fat_buffer(mydata);
-		if (ret) {
-			printf("Error: flush fat buffer\n");
-			goto exit;
-		}
-
-		/* Write directory table to device */
-		ret = set_cluster(mydata, dir_curclust,
-			    get_dentfromdir_block,
-			    mydata->clust_size * mydata->sect_size);
-		if (ret) {
-			printf("Error: writing directory entry\n");
-			goto exit;
-		}
-	} else {
-		/* Set short name to set alias checksum field in dir_slot */
-		set_name(empty_dentptr, filename);
-		fill_dir_slot(mydata, &empty_dentptr, filename);
-
-		ret = start_cluster = find_empty_cluster(mydata);
-		if (ret < 0) {
-			printf("Error: finding empty cluster\n");
-			goto exit;
-		}
-
-		ret = check_overflow(mydata, start_cluster, size);
-		if (ret) {
-			printf("Error: %ld overflow\n", size);
-			goto exit;
-		}
-
-		/* Set attribute as archieve for regular file */
-		fill_dentry(mydata, empty_dentptr, filename,
-			start_cluster, size, 0x20);
-
-		ret = set_contents(mydata, empty_dentptr, buffer, size);
-		if (ret < 0) {
-			printf("Error: writing contents\n");
-			goto exit;
-		}
-		write_size = ret;
-		debug("attempt to write 0x%x bytes\n", write_size);
-
-		/* Flush fat buffer */
-		ret = flush_fat_buffer(mydata);
-		if (ret) {
-			printf("Error: flush fat buffer\n");
-			goto exit;
-		}
-
-		/* Write directory table to device */
-		ret = set_cluster(mydata, dir_curclust,
-			    get_dentfromdir_block,
-			    mydata->clust_size * mydata->sect_size);
-		if (ret) {
-			printf("Error: writing directory entry\n");
-			goto exit;
-		}
-	}
-
-exit:
-	free(mydata->fatbuf);
-	return ret < 0 ? ret : write_size;
-}
-
-int file_fat_write(const char *filename, void *buffer, unsigned long maxsize)
-{
-	printf("writing %s\n", filename);
-	return do_fat_write(filename, buffer, maxsize);
-}