Re: [PATCH] fs/locks.c fcntl_setlease did not check if a file was opened for writing before granting a read lease
From: Joseph D. Wagner
Date: Thu Nov 27 2003 - 15:51:42 EST
>> But I THINK this is how a patch would fix the problem, in theory.
> Sorry, it won't.
...
> To detect if anyone has the file open for writing, you'll a new count
> field which keeps track of writer references. Something like this:
>
> if ((arg == F_RDLCK)
> && ((atomic_read(&inode->i_writer_count) != 0)))
>
> You'll also need to modify all the places where that needs to be
> maintained.
Well, dang it all. Why didn't they guy who implemented leasing in the first
place bother to do it right the first time?
I don't have the time or technical expertise in kernel development to go
through all that. Somebody else is going to have to pick up his slack.
Joseph D. Wagner
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