https://bugzilla.kernel.org/show_bug.cgi?id=15792
--- Comment #5 from Dmitry Monakhov <dmonakhov@openvz.org> 2010-04-19 03:42:20 ---
Ohh.. one more thing, which is not actually related with the name of the bug,
But this peace of code was already mention here. Let's just document this here.
fs/ext4/extents.c
3288:int ext4_ext_get_blocks(...)
{
....
3477: if (unlikely(EXT4_I(inode)->i_flags & EXT4_EOFBLOCKS_FL)) {
3478: if (unlikely(!eh->eh_entries)) {
3479: EXT4_ERROR_INODE(inode,
3480: "eh->eh_entries == 0 ee_block %d",
3481: ex->ee_block);
3482: err = -EIO;
3483: goto out2;
3484: }
3485: last_ex = EXT_LAST_EXTENT(eh);
3486: if (iblock + ar.len > le32_to_cpu(last_ex->ee_block)
3487: + ext4_ext_get_actual_len(last_ex))
##### ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
##### If depth > 0 then last_ex may not be the latest extent of the file.
##### because "eh" is just a one of leafs(writing at the middle of a file)
##### We have to find latest extent by traversing a whole path again but
##### always chose the latest eh,ex.
3488: EXT4_I(inode)->i_flags &= ~EXT4_EOFBLOCKS_FL;
for (
3489: }
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