Re: Kernel bug: Bad page state: related to generic symlink code andmmap

From: Mika Penttilä
Date: Fri Aug 19 2005 - 14:49:42 EST


Al Viro wrote:

On Fri, Aug 19, 2005 at 10:16:47PM +0300, Mika Penttilä wrote:


Just out of curiosity - what protects even local filesystems against concurrent truncate and symlink resolving when using the page cache helpers?



How do you get truncate(2) or ftruncate(2) to do something with a symlink?
The former follows links, the latter takes an open file...
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Yes that is right, there is no way to invalidate the symlink inode mapping page(s) from user space.

--Mika




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