--- zzzz-none-000/linux-3.10.107/fs/udf/dir.c	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/fs/udf/dir.c	2021-02-04 17:41:59.000000000 +0000
@@ -30,19 +30,20 @@
 #include <linux/errno.h>
 #include <linux/mm.h>
 #include <linux/slab.h>
-#include <linux/buffer_head.h>
 
 #include "udf_i.h"
 #include "udf_sb.h"
 
-static int do_udf_readdir(struct inode *dir, struct file *filp,
-			  filldir_t filldir, void *dirent)
+
+static int udf_readdir(struct file *file, struct dir_context *ctx)
 {
+	struct inode *dir = file_inode(file);
+	struct udf_inode_info *iinfo = UDF_I(dir);
 	struct udf_fileident_bh fibh = { .sbh = NULL, .ebh = NULL};
 	struct fileIdentDesc *fi = NULL;
 	struct fileIdentDesc cfi;
 	int block, iblock;
-	loff_t nf_pos = (filp->f_pos - 1) << 2;
+	loff_t nf_pos;
 	int flen;
 	unsigned char *fname = NULL;
 	unsigned char *nameptr;
@@ -54,10 +55,15 @@
 	uint32_t elen;
 	sector_t offset;
 	int i, num, ret = 0;
-	unsigned int dt_type;
 	struct extent_position epos = { NULL, 0, {0, 0} };
-	struct udf_inode_info *iinfo;
+	struct super_block *sb = dir->i_sb;
 
+	if (ctx->pos == 0) {
+		if (!dir_emit_dot(file, ctx))
+			return 0;
+		ctx->pos = 1;
+	}
+	nf_pos = (ctx->pos - 1) << 2;
 	if (nf_pos >= size)
 		goto out;
 
@@ -70,17 +76,16 @@
 	if (nf_pos == 0)
 		nf_pos = udf_ext0_offset(dir);
 
-	fibh.soffset = fibh.eoffset = nf_pos & (dir->i_sb->s_blocksize - 1);
-	iinfo = UDF_I(dir);
+	fibh.soffset = fibh.eoffset = nf_pos & (sb->s_blocksize - 1);
 	if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
-		if (inode_bmap(dir, nf_pos >> dir->i_sb->s_blocksize_bits,
+		if (inode_bmap(dir, nf_pos >> sb->s_blocksize_bits,
 		    &epos, &eloc, &elen, &offset)
 		    != (EXT_RECORDED_ALLOCATED >> 30)) {
 			ret = -ENOENT;
 			goto out;
 		}
-		block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
-		if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
+		block = udf_get_lb_pblock(sb, &eloc, offset);
+		if ((++offset << sb->s_blocksize_bits) < elen) {
 			if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 				epos.offset -= sizeof(struct short_ad);
 			else if (iinfo->i_alloc_type ==
@@ -90,18 +95,18 @@
 			offset = 0;
 		}
 
-		if (!(fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block))) {
+		if (!(fibh.sbh = fibh.ebh = udf_tread(sb, block))) {
 			ret = -EIO;
 			goto out;
 		}
 
-		if (!(offset & ((16 >> (dir->i_sb->s_blocksize_bits - 9)) - 1))) {
-			i = 16 >> (dir->i_sb->s_blocksize_bits - 9);
-			if (i + offset > (elen >> dir->i_sb->s_blocksize_bits))
-				i = (elen >> dir->i_sb->s_blocksize_bits) - offset;
+		if (!(offset & ((16 >> (sb->s_blocksize_bits - 9)) - 1))) {
+			i = 16 >> (sb->s_blocksize_bits - 9);
+			if (i + offset > (elen >> sb->s_blocksize_bits))
+				i = (elen >> sb->s_blocksize_bits) - offset;
 			for (num = 0; i > 0; i--) {
-				block = udf_get_lb_pblock(dir->i_sb, &eloc, offset + i);
-				tmp = udf_tgetblk(dir->i_sb, block);
+				block = udf_get_lb_pblock(sb, &eloc, offset + i);
+				tmp = udf_tgetblk(sb, block);
 				if (tmp && !buffer_uptodate(tmp) && !buffer_locked(tmp))
 					bha[num++] = tmp;
 				else
@@ -116,7 +121,9 @@
 	}
 
 	while (nf_pos < size) {
-		filp->f_pos = (nf_pos >> 2) + 1;
+		struct kernel_lb_addr tloc;
+
+		ctx->pos = (nf_pos >> 2) + 1;
 
 		fi = udf_fileident_read(dir, &nf_pos, &fibh, &cfi, &epos, &eloc,
 					&elen, &offset);
@@ -145,34 +152,32 @@
 		}
 
 		if ((cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
-			if (!UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNDELETE))
+			if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
 				continue;
 		}
 
 		if ((cfi.fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) {
-			if (!UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNHIDE))
+			if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
 				continue;
 		}
 
 		if (cfi.fileCharacteristics & FID_FILE_CHAR_PARENT) {
-			iblock = parent_ino(filp->f_path.dentry);
-			flen = 2;
-			memcpy(fname, "..", flen);
-			dt_type = DT_DIR;
-		} else {
-			struct kernel_lb_addr tloc = lelb_to_cpu(cfi.icb.extLocation);
-
-			iblock = udf_get_lb_pblock(dir->i_sb, &tloc, 0);
-			flen = udf_get_filename(dir->i_sb, nameptr, fname, lfi);
-			dt_type = DT_UNKNOWN;
+			if (!dir_emit_dotdot(file, ctx))
+				goto out;
+			continue;
 		}
 
-		if (flen && filldir(dirent, fname, flen, filp->f_pos,
-				    iblock, dt_type) < 0)
+		flen = udf_get_filename(sb, nameptr, lfi, fname, UDF_NAME_LEN);
+		if (flen < 0)
+			continue;
+
+		tloc = lelb_to_cpu(cfi.icb.extLocation);
+		iblock = udf_get_lb_pblock(sb, &tloc, 0);
+		if (!dir_emit(ctx, fname, flen, iblock, DT_UNKNOWN))
 			goto out;
 	} /* end while */
 
-	filp->f_pos = (nf_pos >> 2) + 1;
+	ctx->pos = (nf_pos >> 2) + 1;
 
 out:
 	if (fibh.sbh != fibh.ebh)
@@ -184,27 +189,11 @@
 	return ret;
 }
 
-static int udf_readdir(struct file *filp, void *dirent, filldir_t filldir)
-{
-	struct inode *dir = file_inode(filp);
-	int result;
-
-	if (filp->f_pos == 0) {
-		if (filldir(dirent, ".", 1, filp->f_pos, dir->i_ino, DT_DIR) < 0) {
-			return 0;
-		}
-		filp->f_pos++;
-	}
-
-	result = do_udf_readdir(dir, filp, filldir, dirent);
- 	return result;
-}
-
 /* readdir and lookup functions */
 const struct file_operations udf_dir_operations = {
 	.llseek			= generic_file_llseek,
 	.read			= generic_read_dir,
-	.readdir		= udf_readdir,
+	.iterate		= udf_readdir,
 	.unlocked_ioctl		= udf_ioctl,
 	.fsync			= generic_file_fsync,
 };