Prev: [RFC 2/5] NMI return notifier
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From: npiggin on 23 Jun 2010 23:20
dentry referenced bit is only set when installing the dentry back
onto the LRU. However with lazy LRU, the dentry can already be on
the LRU list at dput time, thus missing out on setting the referenced
bit. Fix this.

Signed-off-by: Nick Piggin <npiggin(a)suse.de>

Index: linux-2.6/fs/dcache.c
===================================================================
--- linux-2.6.orig/fs/dcache.c
+++ linux-2.6/fs/dcache.c
@@ -387,10 +387,10 @@ repeat:
/* Unreachable? Get rid of it */
if (d_unhashed(dentry))
goto kill_it;
- if (list_empty(&dentry->d_lru)) {
- dentry->d_flags |= DCACHE_REFERENCED;
+ /* Otherwise leave it cached and ensure it's on the LRU */
+ if (list_empty(&dentry->d_lru))
dentry_lru_add(dentry);
- }
+ dentry->d_flags |= DCACHE_REFERENCED;
dentry->d_count--;
spin_unlock(&dentry->d_lock);
return;


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Prev: [RFC 2/5] NMI return notifier
Next: [patch 20/52] fs: dcache reduce dcache_inode_lock