提交 c334b113 编写于 作者: J Josef Bacik 提交者: Al Viro

Ext4: handle SEEK_HOLE/SEEK_DATA generically

Since Ext4 has its own lseek we need to make sure it handles
SEEK_HOLE/SEEK_DATA.  For now just do the same thing that is done in the generic
case, somebody else can come along and make it do fancy things later.  Thanks,
Signed-off-by: NJosef Bacik <josef@redhat.com>
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
上级 b2675157
......@@ -236,6 +236,27 @@ loff_t ext4_llseek(struct file *file, loff_t offset, int origin)
}
offset += file->f_pos;
break;
case SEEK_DATA:
/*
* In the generic case the entire file is data, so as long as
* offset isn't at the end of the file then the offset is data.
*/
if (offset >= inode->i_size) {
mutex_unlock(&inode->i_mutex);
return -ENXIO;
}
break;
case SEEK_HOLE:
/*
* There is a virtual hole at the end of the file, so as long as
* offset isn't i_size or larger, return i_size.
*/
if (offset >= inode->i_size) {
mutex_unlock(&inode->i_mutex);
return -ENXIO;
}
offset = inode->i_size;
break;
}
if (offset < 0 || offset > maxbytes) {
......
Markdown is supported
0% .
You are about to add 0 people to the discussion. Proceed with caution.
先完成此消息的编辑!
想要评论请 注册