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[XFS] Fix race when looking up reclaimable inodes

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If we get a race looking up a reclaimable inode, we can end up with the
winner proceeding to use the inode before it has been completely
re-initialised. This is a Bad Thing.

Fix the race by checking whether we are still initialising the inod eonce
we have a reference to it, and if so wait for the initialisation to
complete before continuing.

While there, fix a leaked reference count in the same code when
encountering an unlinked inode and we are not doing a lookup for a create
operation.

SGI-PV: 987246

SGI-Modid: xfs-linux-melb:xfs-kern:32429a

Signed-off-by: David Chinner <david@fromorbit.com>
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
This commit is contained in:
David Chinner
2008-10-30 18:32:43 +11:00
committed by Lachlan McIlroy
parent e0b8e8b65d
commit 6bfb3d065f
2 changed files with 23 additions and 10 deletions
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fs/xfs/linux-2.6/xfs_linux.h
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@@ -77,6 +77,7 @@
#include <linux/spinlock.h>
#include <linux/random.h>
#include <linux/ctype.h>
#include <linux/writeback.h>
#include <asm/page.h>
#include <asm/div64.h>