[PATCH] FAT: fat_build_inode() cleanup

Just use ERR_PTR() instead of getting the error code by additional
argument.
Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

fs/fat/inode.c

@@ -304,23 +304,25 @@ static int fat_fill_inode(struct inode *inode, struct msdos_dir_entry *de)
 }
 
 struct inode *fat_build_inode(struct super_block *sb,
-			struct msdos_dir_entry *de, loff_t i_pos, int *res)
+			struct msdos_dir_entry *de, loff_t i_pos)
 {
 	struct inode *inode;
-	*res = 0;
+	int err;
+
 	inode = fat_iget(sb, i_pos);
 	if (inode)
 		goto out;
 	inode = new_inode(sb);
-	*res = -ENOMEM;
-	if (!inode)
+	if (!inode) {
+		inode = ERR_PTR(-ENOMEM);
 		goto out;
+	}
 	inode->i_ino = iunique(sb, MSDOS_ROOT_INO);
 	inode->i_version = 1;
-	*res = fat_fill_inode(inode, de);
-	if (*res < 0) {
+	err = fat_fill_inode(inode, de);
+	if (err) {
 		iput(inode);
-		inode = NULL;
+		inode = ERR_PTR(err);
 		goto out;
 	}
 	fat_attach(inode, i_pos);
@@ -643,39 +645,35 @@ fat_encode_fh(struct dentry *de, __u32 *fh, int *lenp, int connectable)
 
 static struct dentry *fat_get_parent(struct dentry *child)
 {
-	struct buffer_head *bh=NULL;
-	struct msdos_dir_entry *de = NULL;
-	struct dentry *parent = NULL;
-	int res;
-	loff_t i_pos = 0;
+	struct buffer_head *bh;
+	struct msdos_dir_entry *de;
+	loff_t i_pos;
+	struct dentry *parent;
 	struct inode *inode;
+	int err;
 
 	lock_kernel();
-	res = fat_scan(child->d_inode, MSDOS_DOTDOT, &bh, &de, &i_pos);
 
-	if (res < 0)
+	err = fat_scan(child->d_inode, MSDOS_DOTDOT, &bh, &de, &i_pos);
+	if (err) {
+		parent = ERR_PTR(err);
 		goto out;
-	inode = fat_build_inode(child->d_sb, de, i_pos, &res);
-	if (res)
+	}
+	inode = fat_build_inode(child->d_sb, de, i_pos);
+	brelse(bh);
+	if (IS_ERR(inode)) {
+		parent = ERR_PTR(PTR_ERR(inode));
 		goto out;
-	if (!inode)
-		res = -EACCES;
-	else {
-		parent = d_alloc_anon(inode);
-		if (!parent) {
-			iput(inode);
-			res = -ENOMEM;
-		}
 	}
-
- out:
-	if(bh)
-		brelse(bh);
+	parent = d_alloc_anon(inode);
+	if (!parent) {
+		iput(inode);
+		parent = ERR_PTR(-ENOMEM);
+	}
+out:
 	unlock_kernel();
-	if (res)
-		return ERR_PTR(res);
-	else
-		return parent;
+
+	return parent;
 }
 
 static struct export_operations fat_export_ops = {

fs/msdos/namei.c

@@ -236,9 +236,11 @@ static struct dentry *msdos_lookup(struct inode *dir, struct dentry *dentry,
 		goto add;
 	if (res < 0)
 		goto out;
-	inode = fat_build_inode(sb, de, i_pos, &res);
-	if (res)
+	inode = fat_build_inode(sb, de, i_pos);
+	if (IS_ERR(inode)) {
+		res = PTR_ERR(inode);
 		goto out;
+	}
 add:
 	res = 0;
 	dentry = d_splice_alias(inode, dentry);
@@ -314,11 +316,11 @@ static int msdos_create(struct inode *dir, struct dentry *dentry, int mode,
 		unlock_kernel();
 		return res;
 	}
-	inode = fat_build_inode(dir->i_sb, de, i_pos, &res);
+	inode = fat_build_inode(dir->i_sb, de, i_pos);
 	brelse(bh);
-	if (!inode) {
+	if (IS_ERR(inode)) {
 		unlock_kernel();
-		return res;
+		return PTR_ERR(inode);
 	}
 	inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
 	mark_inode_dirty(inode);
@@ -392,9 +394,10 @@ static int msdos_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 	res = msdos_add_entry(dir, msdos_name, &bh, &de, &i_pos, 1, is_hid);
 	if (res)
 		goto out_unlock;
-	inode = fat_build_inode(dir->i_sb, de, i_pos, &res);
-	if (!inode) {
+	inode = fat_build_inode(dir->i_sb, de, i_pos);
+	if (IS_ERR(inode)) {
 		brelse(bh);
+		res = PTR_ERR(inode);
 		goto out_unlock;
 	}
 	res = 0;

fs/vfat/namei.c

@@ -757,11 +757,11 @@ static struct dentry *vfat_lookup(struct inode *dir, struct dentry *dentry,
 		table++;
 		goto error;
 	}
-	inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos, &err);
+	inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos);
 	brelse(sinfo.bh);
-	if (err) {
+	if (IS_ERR(inode)) {
 		unlock_kernel();
-		return ERR_PTR(err);
+		return ERR_PTR(PTR_ERR(inode));
 	}
 	alias = d_find_alias(inode);
 	if (alias) {
@@ -798,10 +798,12 @@ static int vfat_create(struct inode *dir, struct dentry *dentry, int mode,
 	res = vfat_add_entry(dir, &dentry->d_name, 0, &sinfo);
 	if (res < 0)
 		goto out;
-	inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos, &res);
+	inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos);
 	brelse(sinfo.bh);
-	if (!inode)
+	if (IS_ERR(inode)) {
+		res = PTR_ERR(inode);
 		goto out;
+	}
 	res = 0;
 	inode->i_version++;
 	inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
@@ -883,9 +885,11 @@ static int vfat_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 	res = vfat_add_entry(dir, &dentry->d_name, 1, &sinfo);
 	if (res < 0)
 		goto out;
-	inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos, &res);
-	if (!inode)
+	inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos);
+	if (IS_ERR(inode)) {
+		res = PTR_ERR(inode);
 		goto out_brelse;
+	}
 	inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
 	mark_inode_dirty(inode);
 	inode->i_version++;
@@ -967,7 +971,6 @@ static int vfat_rename(struct inode *old_dir, struct dentry *old_dentry,
 	}
 	new_dir->i_version++;
 
-	/* releases old_bh */
 	err = fat_remove_entries(old_dir, &old_sinfo);	/* and releases bh */
 	old_sinfo.bh = NULL;
 	if (err)

include/linux/msdos_fs.h

@@ -394,7 +394,7 @@ extern void fat_attach(struct inode *inode, loff_t i_pos);
 extern void fat_detach(struct inode *inode);
 extern struct inode *fat_iget(struct super_block *sb, loff_t i_pos);
 extern struct inode *fat_build_inode(struct super_block *sb,
-			struct msdos_dir_entry *de, loff_t i_pos, int *res);
+			struct msdos_dir_entry *de, loff_t i_pos);
 extern int fat_sync_inode(struct inode *inode);
 extern int fat_fill_super(struct super_block *sb, void *data, int silent,
 			struct inode_operations *fs_dir_inode_ops, int isvfat);