Moved, renamed, and deleted files

The original directory structure was scattered and unorganized.
Changes are basically to make it look like kernel structure.

1 files changed, 0 insertions, 687 deletions

diff --git a/ANDROID_3.4.5/fs/fat/fatent.c b/ANDROID_3.4.5/fs/fat/fatent.c
deleted file mode 100644
index 4a879483..00000000
--- a/ANDROID_3.4.5/fs/fat/fatent.c
+++ /dev/null
@@ -1,687 +0,0 @@
-/*
- * Copyright (C) 2004, OGAWA Hirofumi
- * Released under GPL v2.
- */
-
-#include <linux/module.h>
-#include <linux/fs.h>
-#include <linux/msdos_fs.h>
-#include <linux/blkdev.h>
-#include "fat.h"
-
-struct fatent_operations {
-	void (*ent_blocknr)(struct super_block *, int, int *, sector_t *);
-	void (*ent_set_ptr)(struct fat_entry *, int);
-	int (*ent_bread)(struct super_block *, struct fat_entry *,
-			 int, sector_t);
-	int (*ent_get)(struct fat_entry *);
-	void (*ent_put)(struct fat_entry *, int);
-	int (*ent_next)(struct fat_entry *);
-};
-
-static DEFINE_SPINLOCK(fat12_entry_lock);
-
-static void fat12_ent_blocknr(struct super_block *sb, int entry,
-			      int *offset, sector_t *blocknr)
-{
-	struct msdos_sb_info *sbi = MSDOS_SB(sb);
-	int bytes = entry + (entry >> 1);
-	WARN_ON(entry < FAT_START_ENT || sbi->max_cluster <= entry);
-	*offset = bytes & (sb->s_blocksize - 1);
-	*blocknr = sbi->fat_start + (bytes >> sb->s_blocksize_bits);
-}
-
-static void fat_ent_blocknr(struct super_block *sb, int entry,
-			    int *offset, sector_t *blocknr)
-{
-	struct msdos_sb_info *sbi = MSDOS_SB(sb);
-	int bytes = (entry << sbi->fatent_shift);
-	WARN_ON(entry < FAT_START_ENT || sbi->max_cluster <= entry);
-	*offset = bytes & (sb->s_blocksize - 1);
-	*blocknr = sbi->fat_start + (bytes >> sb->s_blocksize_bits);
-}
-
-static void fat12_ent_set_ptr(struct fat_entry *fatent, int offset)
-{
-	struct buffer_head **bhs = fatent->bhs;
-	if (fatent->nr_bhs == 1) {
-		WARN_ON(offset >= (bhs[0]->b_size - 1));
-		fatent->u.ent12_p[0] = bhs[0]->b_data + offset;
-		fatent->u.ent12_p[1] = bhs[0]->b_data + (offset + 1);
-	} else {
-		WARN_ON(offset != (bhs[0]->b_size - 1));
-		fatent->u.ent12_p[0] = bhs[0]->b_data + offset;
-		fatent->u.ent12_p[1] = bhs[1]->b_data;
-	}
-}
-
-static void fat16_ent_set_ptr(struct fat_entry *fatent, int offset)
-{
-	WARN_ON(offset & (2 - 1));
-	fatent->u.ent16_p = (__le16 *)(fatent->bhs[0]->b_data + offset);
-}
-
-static void fat32_ent_set_ptr(struct fat_entry *fatent, int offset)
-{
-	WARN_ON(offset & (4 - 1));
-	fatent->u.ent32_p = (__le32 *)(fatent->bhs[0]->b_data + offset);
-}
-
-static int fat12_ent_bread(struct super_block *sb, struct fat_entry *fatent,
-			   int offset, sector_t blocknr)
-{
-	struct buffer_head **bhs = fatent->bhs;
-
-	WARN_ON(blocknr < MSDOS_SB(sb)->fat_start);
-	fatent->fat_inode = MSDOS_SB(sb)->fat_inode;
-
-	bhs[0] = sb_bread(sb, blocknr);
-	if (!bhs[0])
-		goto err;
-
-	if ((offset + 1) < sb->s_blocksize)
-		fatent->nr_bhs = 1;
-	else {
-		/* This entry is block boundary, it needs the next block */
-		blocknr++;
-		bhs[1] = sb_bread(sb, blocknr);
-		if (!bhs[1])
-			goto err_brelse;
-		fatent->nr_bhs = 2;
-	}
-	fat12_ent_set_ptr(fatent, offset);
-	return 0;
-
-err_brelse:
-	brelse(bhs[0]);
-err:
-	//kevin delete, it show too much log
-	//fat_msg(sb, KERN_ERR, "FAT read failed (blocknr %llu)", (llu)blocknr);
-	return -EIO;
-}
-
-static int fat_ent_bread(struct super_block *sb, struct fat_entry *fatent,
-			 int offset, sector_t blocknr)
-{
-	struct fatent_operations *ops = MSDOS_SB(sb)->fatent_ops;
-
-	WARN_ON(blocknr < MSDOS_SB(sb)->fat_start);
-	fatent->fat_inode = MSDOS_SB(sb)->fat_inode;
-	fatent->bhs[0] = sb_bread(sb, blocknr);
-	if (!fatent->bhs[0]) {
-		//kevin delete, it show too much log
-		//fat_msg(sb, KERN_ERR, "FAT read failed (blocknr %llu)",
-		//       (llu)blocknr);
-		return -EIO;
-	}
-	fatent->nr_bhs = 1;
-	ops->ent_set_ptr(fatent, offset);
-	return 0;
-}
-
-static int fat12_ent_get(struct fat_entry *fatent)
-{
-	u8 **ent12_p = fatent->u.ent12_p;
-	int next;
-
-	spin_lock(&fat12_entry_lock);
-	if (fatent->entry & 1)
-		next = (*ent12_p[0] >> 4) | (*ent12_p[1] << 4);
-	else
-		next = (*ent12_p[1] << 8) | *ent12_p[0];
-	spin_unlock(&fat12_entry_lock);
-
-	next &= 0x0fff;
-	if (next >= BAD_FAT12)
-		next = FAT_ENT_EOF;
-	return next;
-}
-
-static int fat16_ent_get(struct fat_entry *fatent)
-{
-	int next = le16_to_cpu(*fatent->u.ent16_p);
-	WARN_ON((unsigned long)fatent->u.ent16_p & (2 - 1));
-	if (next >= BAD_FAT16)
-		next = FAT_ENT_EOF;
-	return next;
-}
-
-static int fat32_ent_get(struct fat_entry *fatent)
-{
-	int next = le32_to_cpu(*fatent->u.ent32_p) & 0x0fffffff;
-	WARN_ON((unsigned long)fatent->u.ent32_p & (4 - 1));
-	if (next >= BAD_FAT32)
-		next = FAT_ENT_EOF;
-	return next;
-}
-
-static void fat12_ent_put(struct fat_entry *fatent, int new)
-{
-	u8 **ent12_p = fatent->u.ent12_p;
-
-	if (new == FAT_ENT_EOF)
-		new = EOF_FAT12;
-
-	spin_lock(&fat12_entry_lock);
-	if (fatent->entry & 1) {
-		*ent12_p[0] = (new << 4) | (*ent12_p[0] & 0x0f);
-		*ent12_p[1] = new >> 4;
-	} else {
-		*ent12_p[0] = new & 0xff;
-		*ent12_p[1] = (*ent12_p[1] & 0xf0) | (new >> 8);
-	}
-	spin_unlock(&fat12_entry_lock);
-
-	mark_buffer_dirty_inode(fatent->bhs[0], fatent->fat_inode);
-	if (fatent->nr_bhs == 2)
-		mark_buffer_dirty_inode(fatent->bhs[1], fatent->fat_inode);
-}
-
-static void fat16_ent_put(struct fat_entry *fatent, int new)
-{
-	if (new == FAT_ENT_EOF)
-		new = EOF_FAT16;
-
-	*fatent->u.ent16_p = cpu_to_le16(new);
-	mark_buffer_dirty_inode(fatent->bhs[0], fatent->fat_inode);
-}
-
-static void fat32_ent_put(struct fat_entry *fatent, int new)
-{
-	if (new == FAT_ENT_EOF)
-		new = EOF_FAT32;
-
-	WARN_ON(new & 0xf0000000);
-	new |= le32_to_cpu(*fatent->u.ent32_p) & ~0x0fffffff;
-	*fatent->u.ent32_p = cpu_to_le32(new);
-	mark_buffer_dirty_inode(fatent->bhs[0], fatent->fat_inode);
-}
-
-static int fat12_ent_next(struct fat_entry *fatent)
-{
-	u8 **ent12_p = fatent->u.ent12_p;
-	struct buffer_head **bhs = fatent->bhs;
-	u8 *nextp = ent12_p[1] + 1 + (fatent->entry & 1);
-
-	fatent->entry++;
-	if (fatent->nr_bhs == 1) {
-		WARN_ON(ent12_p[0] > (u8 *)(bhs[0]->b_data + (bhs[0]->b_size - 2)));
-		WARN_ON(ent12_p[1] > (u8 *)(bhs[0]->b_data + (bhs[0]->b_size - 1)));
-		if (nextp < (u8 *)(bhs[0]->b_data + (bhs[0]->b_size - 1))) {
-			ent12_p[0] = nextp - 1;
-			ent12_p[1] = nextp;
-			return 1;
-		}
-	} else {
-		WARN_ON(ent12_p[0] != (u8 *)(bhs[0]->b_data + (bhs[0]->b_size - 1)));
-		WARN_ON(ent12_p[1] != (u8 *)bhs[1]->b_data);
-		ent12_p[0] = nextp - 1;
-		ent12_p[1] = nextp;
-		brelse(bhs[0]);
-		bhs[0] = bhs[1];
-		fatent->nr_bhs = 1;
-		return 1;
-	}
-	ent12_p[0] = NULL;
-	ent12_p[1] = NULL;
-	return 0;
-}
-
-static int fat16_ent_next(struct fat_entry *fatent)
-{
-	const struct buffer_head *bh = fatent->bhs[0];
-	fatent->entry++;
-	if (fatent->u.ent16_p < (__le16 *)(bh->b_data + (bh->b_size - 2))) {
-		fatent->u.ent16_p++;
-		return 1;
-	}
-	fatent->u.ent16_p = NULL;
-	return 0;
-}
-
-static int fat32_ent_next(struct fat_entry *fatent)
-{
-	const struct buffer_head *bh = fatent->bhs[0];
-	fatent->entry++;
-	if (fatent->u.ent32_p < (__le32 *)(bh->b_data + (bh->b_size - 4))) {
-		fatent->u.ent32_p++;
-		return 1;
-	}
-	fatent->u.ent32_p = NULL;
-	return 0;
-}
-
-static struct fatent_operations fat12_ops = {
-	.ent_blocknr	= fat12_ent_blocknr,
-	.ent_set_ptr	= fat12_ent_set_ptr,
-	.ent_bread	= fat12_ent_bread,
-	.ent_get	= fat12_ent_get,
-	.ent_put	= fat12_ent_put,
-	.ent_next	= fat12_ent_next,
-};
-
-static struct fatent_operations fat16_ops = {
-	.ent_blocknr	= fat_ent_blocknr,
-	.ent_set_ptr	= fat16_ent_set_ptr,
-	.ent_bread	= fat_ent_bread,
-	.ent_get	= fat16_ent_get,
-	.ent_put	= fat16_ent_put,
-	.ent_next	= fat16_ent_next,
-};
-
-static struct fatent_operations fat32_ops = {
-	.ent_blocknr	= fat_ent_blocknr,
-	.ent_set_ptr	= fat32_ent_set_ptr,
-	.ent_bread	= fat_ent_bread,
-	.ent_get	= fat32_ent_get,
-	.ent_put	= fat32_ent_put,
-	.ent_next	= fat32_ent_next,
-};
-
-static inline void lock_fat(struct msdos_sb_info *sbi)
-{
-	mutex_lock(&sbi->fat_lock);
-}
-
-static inline void unlock_fat(struct msdos_sb_info *sbi)
-{
-	mutex_unlock(&sbi->fat_lock);
-}
-
-void fat_ent_access_init(struct super_block *sb)
-{
-	struct msdos_sb_info *sbi = MSDOS_SB(sb);
-
-	mutex_init(&sbi->fat_lock);
-
-	switch (sbi->fat_bits) {
-	case 32:
-		sbi->fatent_shift = 2;
-		sbi->fatent_ops = &fat32_ops;
-		break;
-	case 16:
-		sbi->fatent_shift = 1;
-		sbi->fatent_ops = &fat16_ops;
-		break;
-	case 12:
-		sbi->fatent_shift = -1;
-		sbi->fatent_ops = &fat12_ops;
-		break;
-	}
-}
-
-static inline int fat_ent_update_ptr(struct super_block *sb,
-				     struct fat_entry *fatent,
-				     int offset, sector_t blocknr)
-{
-	struct msdos_sb_info *sbi = MSDOS_SB(sb);
-	struct fatent_operations *ops = sbi->fatent_ops;
-	struct buffer_head **bhs = fatent->bhs;
-
-	/* Is this fatent's blocks including this entry? */
-	if (!fatent->nr_bhs || bhs[0]->b_blocknr != blocknr)
-		return 0;
-	if (sbi->fat_bits == 12) {
-		if ((offset + 1) < sb->s_blocksize) {
-			/* This entry is on bhs[0]. */
-			if (fatent->nr_bhs == 2) {
-				brelse(bhs[1]);
-				fatent->nr_bhs = 1;
-			}
-		} else {
-			/* This entry needs the next block. */
-			if (fatent->nr_bhs != 2)
-				return 0;
-			if (bhs[1]->b_blocknr != (blocknr + 1))
-				return 0;
-		}
-	}
-	ops->ent_set_ptr(fatent, offset);
-	return 1;
-}
-
-int fat_ent_read(struct inode *inode, struct fat_entry *fatent, int entry)
-{
-	struct super_block *sb = inode->i_sb;
-	struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb);
-	struct fatent_operations *ops = sbi->fatent_ops;
-	int err, offset;
-	sector_t blocknr;
-
-	if (entry < FAT_START_ENT || sbi->max_cluster <= entry) {
-		fatent_brelse(fatent);
-		fat_fs_error(sb, "invalid access to FAT (entry 0x%08x)", entry);
-		return -EIO;
-	}
-
-	fatent_set_entry(fatent, entry);
-	ops->ent_blocknr(sb, entry, &offset, &blocknr);
-
-	if (!fat_ent_update_ptr(sb, fatent, offset, blocknr)) {
-		fatent_brelse(fatent);
-		err = ops->ent_bread(sb, fatent, offset, blocknr);
-		if (err)
-			return err;
-	}
-	return ops->ent_get(fatent);
-}
-
-/* FIXME: We can write the blocks as more big chunk. */
-static int fat_mirror_bhs(struct super_block *sb, struct buffer_head **bhs,
-			  int nr_bhs)
-{
-	struct msdos_sb_info *sbi = MSDOS_SB(sb);
-	struct buffer_head *c_bh;
-	int err, n, copy;
-
-	err = 0;
-	for (copy = 1; copy < sbi->fats; copy++) {
-		sector_t backup_fat = sbi->fat_length * copy;
-
-		for (n = 0; n < nr_bhs; n++) {
-			c_bh = sb_getblk(sb, backup_fat + bhs[n]->b_blocknr);
-			if (!c_bh) {
-				err = -ENOMEM;
-				goto error;
-			}
-			memcpy(c_bh->b_data, bhs[n]->b_data, sb->s_blocksize);
-			set_buffer_uptodate(c_bh);
-			mark_buffer_dirty_inode(c_bh, sbi->fat_inode);
-			if (sb->s_flags & MS_SYNCHRONOUS)
-				err = sync_dirty_buffer(c_bh);
-			brelse(c_bh);
-			if (err)
-				goto error;
-		}
-	}
-error:
-	return err;
-}
-
-int fat_ent_write(struct inode *inode, struct fat_entry *fatent,
-		  int new, int wait)
-{
-	struct super_block *sb = inode->i_sb;
-	struct fatent_operations *ops = MSDOS_SB(sb)->fatent_ops;
-	int err;
-
-	ops->ent_put(fatent, new);
-	if (wait) {
-		err = fat_sync_bhs(fatent->bhs, fatent->nr_bhs);
-		if (err)
-			return err;
-	}
-	return fat_mirror_bhs(sb, fatent->bhs, fatent->nr_bhs);
-}
-
-static inline int fat_ent_next(struct msdos_sb_info *sbi,
-			       struct fat_entry *fatent)
-{
-	if (sbi->fatent_ops->ent_next(fatent)) {
-		if (fatent->entry < sbi->max_cluster)
-			return 1;
-	}
-	return 0;
-}
-
-static inline int fat_ent_read_block(struct super_block *sb,
-				     struct fat_entry *fatent)
-{
-	struct fatent_operations *ops = MSDOS_SB(sb)->fatent_ops;
-	sector_t blocknr;
-	int offset;
-
-	fatent_brelse(fatent);
-	ops->ent_blocknr(sb, fatent->entry, &offset, &blocknr);
-	return ops->ent_bread(sb, fatent, offset, blocknr);
-}
-
-static void fat_collect_bhs(struct buffer_head **bhs, int *nr_bhs,
-			    struct fat_entry *fatent)
-{
-	int n, i;
-
-	for (n = 0; n < fatent->nr_bhs; n++) {
-		for (i = 0; i < *nr_bhs; i++) {
-			if (fatent->bhs[n] == bhs[i])
-				break;
-		}
-		if (i == *nr_bhs) {
-			get_bh(fatent->bhs[n]);
-			bhs[i] = fatent->bhs[n];
-			(*nr_bhs)++;
-		}
-	}
-}
-
-int fat_alloc_clusters(struct inode *inode, int *cluster, int nr_cluster)
-{
-	struct super_block *sb = inode->i_sb;
-	struct msdos_sb_info *sbi = MSDOS_SB(sb);
-	struct fatent_operations *ops = sbi->fatent_ops;
-	struct fat_entry fatent, prev_ent;
-	struct buffer_head *bhs[MAX_BUF_PER_PAGE];
-	int i, count, err, nr_bhs, idx_clus;
-
-	BUG_ON(nr_cluster > (MAX_BUF_PER_PAGE / 2));	/* fixed limit */
-
-	lock_fat(sbi);
-	if (sbi->free_clusters != -1 && sbi->free_clus_valid &&
-	    sbi->free_clusters < nr_cluster) {
-		unlock_fat(sbi);
-		return -ENOSPC;
-	}
-
-	err = nr_bhs = idx_clus = 0;
-	count = FAT_START_ENT;
-	fatent_init(&prev_ent);
-	fatent_init(&fatent);
-	fatent_set_entry(&fatent, sbi->prev_free + 1);
-	while (count < sbi->max_cluster) {
-		if (fatent.entry >= sbi->max_cluster)
-			fatent.entry = FAT_START_ENT;
-		fatent_set_entry(&fatent, fatent.entry);
-		err = fat_ent_read_block(sb, &fatent);
-		if (err)
-			goto out;
-
-		/* Find the free entries in a block */
-		do {
-			if (ops->ent_get(&fatent) == FAT_ENT_FREE) {
-				int entry = fatent.entry;
-
-				/* make the cluster chain */
-				ops->ent_put(&fatent, FAT_ENT_EOF);
-				if (prev_ent.nr_bhs)
-					ops->ent_put(&prev_ent, entry);
-
-				fat_collect_bhs(bhs, &nr_bhs, &fatent);
-
-				sbi->prev_free = entry;
-				if (sbi->free_clusters != -1)
-					sbi->free_clusters--;
-				sb->s_dirt = 1;
-
-				cluster[idx_clus] = entry;
-				idx_clus++;
-				if (idx_clus == nr_cluster)
-					goto out;
-
-				/*
-				 * fat_collect_bhs() gets ref-count of bhs,
-				 * so we can still use the prev_ent.
-				 */
-				prev_ent = fatent;
-			}
-			count++;
-			if (count == sbi->max_cluster)
-				break;
-		} while (fat_ent_next(sbi, &fatent));
-	}
-
-	/* Couldn't allocate the free entries */
-	sbi->free_clusters = 0;
-	sbi->free_clus_valid = 1;
-	sb->s_dirt = 1;
-	err = -ENOSPC;
-
-out:
-	unlock_fat(sbi);
-	fatent_brelse(&fatent);
-	if (!err) {
-		if (inode_needs_sync(inode))
-			err = fat_sync_bhs(bhs, nr_bhs);
-		if (!err)
-			err = fat_mirror_bhs(sb, bhs, nr_bhs);
-	}
-	for (i = 0; i < nr_bhs; i++)
-		brelse(bhs[i]);
-
-	if (err && idx_clus)
-		fat_free_clusters(inode, cluster[0]);
-
-	return err;
-}
-
-int fat_free_clusters(struct inode *inode, int cluster)
-{
-	struct super_block *sb = inode->i_sb;
-	struct msdos_sb_info *sbi = MSDOS_SB(sb);
-	struct fatent_operations *ops = sbi->fatent_ops;
-	struct fat_entry fatent;
-	struct buffer_head *bhs[MAX_BUF_PER_PAGE];
-	int i, err, nr_bhs;
-	int first_cl = cluster;
-
-	nr_bhs = 0;
-	fatent_init(&fatent);
-	lock_fat(sbi);
-	do {
-		cluster = fat_ent_read(inode, &fatent, cluster);
-		if (cluster < 0) {
-			err = cluster;
-			goto error;
-		} else if (cluster == FAT_ENT_FREE) {
-			fat_fs_error(sb, "%s: deleting FAT entry beyond EOF",
-				     __func__);
-			err = -EIO;
-			goto error;
-		}
-
-		if (sbi->options.discard) {
-			/*
-			 * Issue discard for the sectors we no longer
-			 * care about, batching contiguous clusters
-			 * into one request
-			 */
-			if (cluster != fatent.entry + 1) {
-				int nr_clus = fatent.entry - first_cl + 1;
-
-				sb_issue_discard(sb,
-					fat_clus_to_blknr(sbi, first_cl),
-					nr_clus * sbi->sec_per_clus,
-					GFP_NOFS, 0);
-
-				first_cl = cluster;
-			}
-		}
-
-		ops->ent_put(&fatent, FAT_ENT_FREE);
-		if (sbi->free_clusters != -1) {
-			sbi->free_clusters++;
-			sb->s_dirt = 1;
-		}
-
-		if (nr_bhs + fatent.nr_bhs > MAX_BUF_PER_PAGE) {
-			if (sb->s_flags & MS_SYNCHRONOUS) {
-				err = fat_sync_bhs(bhs, nr_bhs);
-				if (err)
-					goto error;
-			}
-			err = fat_mirror_bhs(sb, bhs, nr_bhs);
-			if (err)
-				goto error;
-			for (i = 0; i < nr_bhs; i++)
-				brelse(bhs[i]);
-			nr_bhs = 0;
-		}
-		fat_collect_bhs(bhs, &nr_bhs, &fatent);
-	} while (cluster != FAT_ENT_EOF);
-
-	if (sb->s_flags & MS_SYNCHRONOUS) {
-		err = fat_sync_bhs(bhs, nr_bhs);
-		if (err)
-			goto error;
-	}
-	err = fat_mirror_bhs(sb, bhs, nr_bhs);
-error:
-	fatent_brelse(&fatent);
-	for (i = 0; i < nr_bhs; i++)
-		brelse(bhs[i]);
-	unlock_fat(sbi);
-
-	return err;
-}
-
-EXPORT_SYMBOL_GPL(fat_free_clusters);
-
-/* 128kb is the whole sectors for FAT12 and FAT16 */
-#define FAT_READA_SIZE		(128 * 1024)
-
-static void fat_ent_reada(struct super_block *sb, struct fat_entry *fatent,
-			  unsigned long reada_blocks)
-{
-	struct fatent_operations *ops = MSDOS_SB(sb)->fatent_ops;
-	sector_t blocknr;
-	int i, offset;
-
-	ops->ent_blocknr(sb, fatent->entry, &offset, &blocknr);
-
-	for (i = 0; i < reada_blocks; i++)
-		sb_breadahead(sb, blocknr + i);
-}
-
-int fat_count_free_clusters(struct super_block *sb)
-{
-	struct msdos_sb_info *sbi = MSDOS_SB(sb);
-	struct fatent_operations *ops = sbi->fatent_ops;
-	struct fat_entry fatent;
-	unsigned long reada_blocks, reada_mask, cur_block;
-	int err = 0, free;
-
-	lock_fat(sbi);
-	if (sbi->free_clusters != -1 && sbi->free_clus_valid)
-		goto out;
-
-	reada_blocks = FAT_READA_SIZE >> sb->s_blocksize_bits;
-	reada_mask = reada_blocks - 1;
-	cur_block = 0;
-
-	free = 0;
-	fatent_init(&fatent);
-	fatent_set_entry(&fatent, FAT_START_ENT);
-	while (fatent.entry < sbi->max_cluster) {
-		/* readahead of fat blocks */
-		if ((cur_block & reada_mask) == 0) {
-			unsigned long rest = sbi->fat_length - cur_block;
-			fat_ent_reada(sb, &fatent, min(reada_blocks, rest));
-		}
-		cur_block++;
-
-		err = fat_ent_read_block(sb, &fatent);
-		if (err)
-			goto out;
-
-		do {
-			if (ops->ent_get(&fatent) == FAT_ENT_FREE)
-				free++;
-		} while (fat_ent_next(sbi, &fatent));
-	}
-	sbi->free_clusters = free;
-	sbi->free_clus_valid = 1;
-	sb->s_dirt = 1;
-	fatent_brelse(&fatent);
-out:
-	unlock_fat(sbi);
-	return err;
-}