linux-ext4 - [Bug 15792] ext4_inode_info->i

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Message-Id: <201004190343.o3J3hOn7027727@demeter.kernel.org>
Date:	Mon, 19 Apr 2010 03:43:24 GMT
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 15792] ext4_inode_info->i_flags modification is racy

https://bugzilla.kernel.org/show_bug.cgi?id=15792





--- Comment #5 from Dmitry Monakhov <dmonakhov@...nvz.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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