提交 4cce0e28 编写于 作者: A Andi Kleen 提交者: root

ext4: replace cut'n'pasted llseek code with generic_file_llseek_size

This gives ext4 the benefits of unlocked llseek.

Cc: tytso@mit.edu
Signed-off-by: NAndi Kleen <ak@linux.intel.com>
Signed-off-by: NChristoph Hellwig <hch@lst.de>
上级 5760495a
......@@ -224,53 +224,8 @@ loff_t ext4_llseek(struct file *file, loff_t offset, int origin)
maxbytes = EXT4_SB(inode->i_sb)->s_bitmap_maxbytes;
else
maxbytes = inode->i_sb->s_maxbytes;
mutex_lock(&inode->i_mutex);
switch (origin) {
case SEEK_END:
offset += inode->i_size;
break;
case SEEK_CUR:
if (offset == 0) {
mutex_unlock(&inode->i_mutex);
return file->f_pos;
}
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) {
mutex_unlock(&inode->i_mutex);
return -EINVAL;
}
if (offset != file->f_pos) {
file->f_pos = offset;
file->f_version = 0;
}
mutex_unlock(&inode->i_mutex);
return offset;
return generic_file_llseek_size(file, offset, origin, maxbytes);
}
const struct file_operations ext4_file_operations = {
......
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