From 6f7f231e7b4f819b912f848a33d946b54261483d Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Fri, 17 May 2013 18:02:17 -0400
Subject: [readdir] convert f2fs

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/fs/cramfs/inode.c b/fs/cramfs/inode.c
index 35b1c7b..e501ac3 100644
--- a/fs/cramfs/inode.c
+++ b/fs/cramfs/inode.c
@@ -349,18 +349,17 @@ static int cramfs_statfs(struct dentry *dentry, struct kstatfs *buf)
 /*
  * Read a cramfs directory entry.
  */
-static int cramfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
+static int cramfs_readdir(struct file *file, struct dir_context *ctx)
 {
-	struct inode *inode = file_inode(filp);
+	struct inode *inode = file_inode(file);
 	struct super_block *sb = inode->i_sb;
 	char *buf;
 	unsigned int offset;
-	int copied;
 
 	/* Offset within the thing. */
-	offset = filp->f_pos;
-	if (offset >= inode->i_size)
+	if (ctx->pos >= inode->i_size)
 		return 0;
+	offset = ctx->pos;
 	/* Directory entries are always 4-byte aligned */
 	if (offset & 3)
 		return -EINVAL;
@@ -369,14 +368,13 @@ static int cramfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
 	if (!buf)
 		return -ENOMEM;
 
-	copied = 0;
 	while (offset < inode->i_size) {
 		struct cramfs_inode *de;
 		unsigned long nextoffset;
 		char *name;
 		ino_t ino;
 		umode_t mode;
-		int namelen, error;
+		int namelen;
 
 		mutex_lock(&read_mutex);
 		de = cramfs_read(sb, OFFSET(inode) + offset, sizeof(*de)+CRAMFS_MAXPATHLEN);
@@ -402,13 +400,10 @@ static int cramfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
 				break;
 			namelen--;
 		}
-		error = filldir(dirent, buf, namelen, offset, ino, mode >> 12);
-		if (error)
+		if (!dir_emit(ctx, buf, namelen, ino, mode >> 12))
 			break;
 
-		offset = nextoffset;
-		filp->f_pos = offset;
-		copied++;
+		ctx->pos = offset = nextoffset;
 	}
 	kfree(buf);
 	return 0;
@@ -547,7 +542,7 @@ static const struct address_space_operations cramfs_aops = {
 static const struct file_operations cramfs_directory_operations = {
 	.llseek		= generic_file_llseek,
 	.read		= generic_read_dir,
-	.readdir	= cramfs_readdir,
+	.iterate	= cramfs_readdir,
 };
 
 static const struct inode_operations cramfs_dir_inode_operations = {
diff --git a/fs/f2fs/dir.c b/fs/f2fs/dir.c
index 1ac6b93..600bb5e 100644
--- a/fs/f2fs/dir.c
+++ b/fs/f2fs/dir.c
@@ -591,24 +591,19 @@ bool f2fs_empty_dir(struct inode *dir)
 	return true;
 }
 
-static int f2fs_readdir(struct file *file, void *dirent, filldir_t filldir)
+static int f2fs_readdir(struct file *file, struct dir_context *ctx)
 {
-	unsigned long pos = file->f_pos;
 	struct inode *inode = file_inode(file);
 	unsigned long npages = dir_blocks(inode);
-	unsigned char *types = NULL;
 	unsigned int bit_pos = 0, start_bit_pos = 0;
-	int over = 0;
 	struct f2fs_dentry_block *dentry_blk = NULL;
 	struct f2fs_dir_entry *de = NULL;
 	struct page *dentry_page = NULL;
-	unsigned int n = 0;
+	unsigned int n = ((unsigned long)ctx->pos / NR_DENTRY_IN_BLOCK);
 	unsigned char d_type = DT_UNKNOWN;
 	int slots;
 
-	types = f2fs_filetype_table;
-	bit_pos = (pos % NR_DENTRY_IN_BLOCK);
-	n = (pos / NR_DENTRY_IN_BLOCK);
+	bit_pos = ((unsigned long)ctx->pos % NR_DENTRY_IN_BLOCK);
 
 	for ( ; n < npages; n++) {
 		dentry_page = get_lock_data_page(inode, n);
@@ -618,31 +613,28 @@ static int f2fs_readdir(struct file *file, void *dirent, filldir_t filldir)
 		start_bit_pos = bit_pos;
 		dentry_blk = kmap(dentry_page);
 		while (bit_pos < NR_DENTRY_IN_BLOCK) {
-			d_type = DT_UNKNOWN;
 			bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
 							NR_DENTRY_IN_BLOCK,
 							bit_pos);
 			if (bit_pos >= NR_DENTRY_IN_BLOCK)
 				break;
 
+			ctx->pos += bit_pos - start_bit_pos;
 			de = &dentry_blk->dentry[bit_pos];
-			if (types && de->file_type < F2FS_FT_MAX)
-				d_type = types[de->file_type];
-
-			over = filldir(dirent,
-					dentry_blk->filename[bit_pos],
-					le16_to_cpu(de->name_len),
-					(n * NR_DENTRY_IN_BLOCK) + bit_pos,
-					le32_to_cpu(de->ino), d_type);
-			if (over) {
-				file->f_pos += bit_pos - start_bit_pos;
+			if (de->file_type < F2FS_FT_MAX)
+				d_type = f2fs_filetype_table[de->file_type];
+			else
+				d_type = DT_UNKNOWN;
+			if (!dir_emit(ctx,
+				      dentry_blk->filename[bit_pos],
+				      le16_to_cpu(de->name_len),
+				      le32_to_cpu(de->ino), d_type))
 				goto success;
-			}
 			slots = GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
 			bit_pos += slots;
 		}
 		bit_pos = 0;
-		file->f_pos = (n + 1) * NR_DENTRY_IN_BLOCK;
+		ctx->pos = (n + 1) * NR_DENTRY_IN_BLOCK;
 		kunmap(dentry_page);
 		f2fs_put_page(dentry_page, 1);
 		dentry_page = NULL;
@@ -659,7 +651,7 @@ success:
 const struct file_operations f2fs_dir_operations = {
 	.llseek		= generic_file_llseek,
 	.read		= generic_read_dir,
-	.readdir	= f2fs_readdir,
+	.iterate	= f2fs_readdir,
 	.fsync		= f2fs_sync_file,
 	.unlocked_ioctl	= f2fs_ioctl,
 };
-- 
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