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nfs d_revalidate() is too trigger-happy with d_drop()

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If dentry found stale happens to be a root of disconnected tree, we
can't d_drop() it; its d_hash is actually part of s_anon and d_drop()
would simply hide it from shrink_dcache_for_umount(), leading to
all sorts of fun, including busy inodes on umount and oopsen after
that.

Bug had been there since at least 2006 (commit c636eb already has it),
so it's definitely -stable fodder.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Cc: stable@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Al Viro 2010-04-29 03:10:43 +01:00 committed by Linus Torvalds
parent 1d16b0f2f3
commit d9e80b7de9
1 changed files with 2 additions and 0 deletions
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2
fs/nfs/dir.c
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@ -837,6 +837,8 @@ static int nfs_lookup_revalidate(struct dentry * dentry, struct nameidata *nd)
/* If we have submounts, don't unhash ! */
if (have_submounts(dentry))
goto out_valid;
if (dentry->d_flags & DCACHE_DISCONNECTED)
goto out_valid;
shrink_dcache_parent(dentry);
}
d_drop(dentry);