Fixed MTP to work with TWRP

fs/affs/symlink.c

@@ -0,0 +1,81 @@
+/*
+ *  linux/fs/affs/symlink.c
+ *
+ *  1995  Hans-Joachim Widmaier - Modified for affs.
+ *
+ *  Copyright (C) 1991, 1992  Linus Torvalds
+ *
+ *  affs symlink handling code
+ */
+
+#include "affs.h"
+
+static int affs_symlink_readpage(struct file *file, struct page *page)
+{
+	struct buffer_head *bh;
+	struct inode *inode = page->mapping->host;
+	char *link = kmap(page);
+	struct slink_front *lf;
+	int err;
+	int			 i, j;
+	char			 c;
+	char			 lc;
+
+	pr_debug("follow_link(ino=%lu)\n", inode->i_ino);
+
+	err = -EIO;
+	bh = affs_bread(inode->i_sb, inode->i_ino);
+	if (!bh)
+		goto fail;
+	i  = 0;
+	j  = 0;
+	lf = (struct slink_front *)bh->b_data;
+	lc = 0;
+
+	if (strchr(lf->symname,':')) {	/* Handle assign or volume name */
+		struct affs_sb_info *sbi = AFFS_SB(inode->i_sb);
+		char *pf;
+		spin_lock(&sbi->symlink_lock);
+		pf = sbi->s_prefix ? sbi->s_prefix : "/";
+		while (i < 1023 && (c = pf[i]))
+			link[i++] = c;
+		spin_unlock(&sbi->symlink_lock);
+		while (i < 1023 && lf->symname[j] != ':')
+			link[i++] = lf->symname[j++];
+		if (i < 1023)
+			link[i++] = '/';
+		j++;
+		lc = '/';
+	}
+	while (i < 1023 && (c = lf->symname[j])) {
+		if (c == '/' && lc == '/' && i < 1020) {	/* parent dir */
+			link[i++] = '.';
+			link[i++] = '.';
+		}
+		link[i++] = c;
+		lc = c;
+		j++;
+	}
+	link[i] = '\0';
+	affs_brelse(bh);
+	SetPageUptodate(page);
+	kunmap(page);
+	unlock_page(page);
+	return 0;
+fail:
+	SetPageError(page);
+	kunmap(page);
+	unlock_page(page);
+	return err;
+}
+
+const struct address_space_operations affs_symlink_aops = {
+	.readpage	= affs_symlink_readpage,
+};
+
+const struct inode_operations affs_symlink_inode_operations = {
+	.readlink	= generic_readlink,
+	.follow_link	= page_follow_link_light,
+	.put_link	= page_put_link,
+	.setattr	= affs_notify_change,
+};