--3922184632-1147692123-878980738=:19224
Content-Type: TEXT/PLAIN; charset=US-ASCII
Hello all!
Well, with all the noise about various inode related problems, here's an
obvious fix that should help some - esp the 'Inode i_mmap ring corrupted'
message. Analysis: 2.0.31 contained a very simple change to iput to
return if the inode came back in use after put_inode and friends were
called. Unfortunately, this triggered an old bug in iget - at the
found_it label, the inode's use count is incremented before the inode is
waited upon. Generally this will overlap with the write_inode() call in
iput - quite a significant chance of happening. Ext2 frequently triggered
this from
The other inode related race lurks in truncate_inode_pages. A call to
put_inode in ext2 and others can result in clear_inode being called, which
will block if pages are busy being written out to disk, or perhaps being
read ahead. Well, if that happens, the inode can be grabbed back into
use.
The attached patch moves the code in iget around, and makes iput lock the
inode until it's done with it. No more need to worry about blocking
operations in put_inode - and it's transparent to the filesystems. Yeah
it's a big lock, but it's one inode... And this way clear_inode doesn't
have a chance of blowing up in people's faces.
-ben
ps There was a */ missing in locks.c - oops!
--3922184632-1147692123-878980738=:19224
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