udf: Do not call udf_block_map() on ICB files

Currently udf_symlink_filler() called udf_block_map() even on files
which have data stored inside the ICB. This is invalid as we cannot map
blocks for such files (although so far the error got silently ignored).
The call happened because we could not call block mapping function once
we've acquired i_data_sem and determined whether the file has data
stored in the ICB. For symlinks the situation is luckily simple as they
get never modified so file type never changes once it is set. Hence we
can check the file type even without i_data_sem. Just drop the
i_data_sem locking and move block mapping to where it is needed.

Signed-off-by: Jan Kara <jack@suse.cz>

fs/udf/symlink.c

@@ -109,27 +109,24 @@ static int udf_symlink_filler(struct file *file, struct folio *folio)
 	unsigned char *symlink;
 	int err;
 	unsigned char *p = page_address(page);
-	struct udf_inode_info *iinfo;
+	struct udf_inode_info *iinfo = UDF_I(inode);
 	uint32_t pos;
 
 	/* We don't support symlinks longer than one block */
 	if (inode->i_size > inode->i_sb->s_blocksize) {
 		err = -ENAMETOOLONG;
-		goto out_unmap;
+		goto out_unlock;
 	}
 
-	iinfo = UDF_I(inode);
-	pos = udf_block_map(inode, 0);
-
-	down_read(&iinfo->i_data_sem);
 	if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
 		symlink = iinfo->i_data + iinfo->i_lenEAttr;
 	} else {
+		pos = udf_block_map(inode, 0);
 		bh = sb_bread(inode->i_sb, pos);
 
 		if (!bh) {
 			err = -EIO;
-			goto out_unlock_inode;
+			goto out_err;
 		}
 
 		symlink = bh->b_data;
@@ -138,17 +135,15 @@ static int udf_symlink_filler(struct file *file, struct folio *folio)
 	err = udf_pc_to_char(inode->i_sb, symlink, inode->i_size, p, PAGE_SIZE);
 	brelse(bh);
 	if (err)
-		goto out_unlock_inode;
+		goto out_err;
 
-	up_read(&iinfo->i_data_sem);
 	SetPageUptodate(page);
 	unlock_page(page);
 	return 0;
 
-out_unlock_inode:
-	up_read(&iinfo->i_data_sem);
+out_err:
 	SetPageError(page);
-out_unmap:
+out_unlock:
 	unlock_page(page);
 	return err;
 }