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ext4_ftruncate being separated into two parts: ext4_ftruncate_no_lock and ext4_ftruncate.

--- a/lwext4/ext4.c

+++ b/lwext4/ext4.c

@@ -1113,18 +1113,12 @@

 	return EOK;

 }

-int ext4_ftruncate(ext4_file *f, uint64_t size)

+static int ext4_ftruncate_no_lock(ext4_file *f, uint64_t size)

 {

 	struct ext4_inode_ref ref;

 	int r;

-	ext4_assert(f && f->mp);

-	if (f->flags & O_RDONLY)

-		return EPERM;

-

-	EXT4_MP_LOCK(f->mp);

-

 	r = ext4_fs_get_inode_ref(&f->mp->fs, f->inode, &ref);

 	if (r != EOK) {

 		EXT4_MP_UNLOCK(f->mp);

@@ -1138,6 +1132,23 @@

 		goto Finish;

 	}

+	if ((ext4_inode_get_mode(&f->mp->fs.sb, ref.inode) & EXT4_INODE_MODE_SOFTLINK)

+			== EXT4_INODE_MODE_SOFTLINK

+			&& f->fsize < sizeof(ref.inode->blocks)

+			&& !ext4_inode_get_blocks_count(&f->mp->fs.sb, ref.inode)) {

+		char *content = (char *)ref.inode->blocks;

+		memset(content + size, 0, sizeof(ref.inode->blocks) - size);

+		ext4_inode_set_size(ref.inode, size);

+		ref.dirty = true;

+

+		f->fsize = size;

+		if (f->fpos > size)

+			f->fpos = size;

+

+		r = EOK;

+		goto Finish;

+	}

+

 	/*Start write back cache mode.*/

 	r = ext4_block_cache_write_back(f->mp->fs.bdev, 1);

 	if (r != EOK)

@@ -1159,6 +1170,22 @@

 Finish:

 	ext4_fs_put_inode_ref(&ref);

+	return r;

+

+}

+

+int ext4_ftruncate(ext4_file *f, uint64_t size)

+{

+	int r;

+	ext4_assert(f && f->mp);

+

+	if (f->flags & O_RDONLY)

+		return EPERM;

+

+	EXT4_MP_LOCK(f->mp);

+

+	r = ext4_ftruncate_no_lock(f, size);

+

 	EXT4_MP_UNLOCK(f->mp);

 	return r;

 }