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fix race in d_splice_alias()

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rehashing the negative placeholder opens a race with d_lookup();
we unhash it almost immediately (by d_move()), but the race
window is there.  Since d_move() doesn't rely on target being
hashed, we don't need that d_rehash() at all.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
2010-03-03 14:13:08 -05:00
parent bec1052e5b
commit 4919c5e45a
1 changed files with 0 additions and 1 deletions
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fs/dcache.c
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@@ -1222,7 +1222,6 @@ struct dentry *d_splice_alias(struct inode *inode, struct dentry *dentry)
BUG_ON(!(new->d_flags & DCACHE_DISCONNECTED)); BUG_ON(!(new->d_flags & DCACHE_DISCONNECTED));
spin_unlock(&dcache_lock); spin_unlock(&dcache_lock);
security_d_instantiate(new, inode); security_d_instantiate(new, inode);
d_rehash(dentry);
d_move(new, dentry); d_move(new, dentry);
iput(inode); iput(inode);
} else { } else {