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fs: improve DCACHE_REFERENCED usage

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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@suse.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Nick Piggin 2010-10-10 05:36:24 -04:00 committed by Al Viro
parent 312d3ca856
commit 265ac90230
1 changed files with 6 additions and 3 deletions
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9
fs/dcache.c
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@ -246,13 +246,16 @@ void dput(struct dentry *dentry)
if (dentry->d_op->d_delete(dentry))
goto unhash_it;
}
/* 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 */
dentry->d_flags |= DCACHE_REFERENCED;
if (list_empty(&dentry->d_lru))
dentry_lru_add(dentry);
}
spin_unlock(&dentry->d_lock);
spin_unlock(&dcache_lock);
return;