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NFS: Don't revalidate the directory permissions on a lookup failure 

[ Upstream commit 82e7ca1334ab16e2e04fafded1cab9dfcdc11b40 ]

There should be no reason to expect the directory permissions to change
just because the directory contents changed or a negative lookup timed
out. So let's avoid doing a full call to nfs_mark_for_revalidate() in
that case.
Furthermore, if this is a negative dentry, and we haven't actually done
a new lookup, then we have no reason yet to believe the directory has
changed at all. So let's remove the gratuitous directory inode
invalidation altogether when called from
nfs_lookup_revalidate_negative().

Reported-by: Geert Jansen <gerardu@amazon.com>
Fixes: 5ceb9d7fda ("NFS: Refactor nfs_lookup_revalidate()")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Trond Myklebust 2021-03-08 14:42:51 -05:00 committed by Greg Kroah-Hartman
parent d5a69ed759
commit d29f9aa6a8
1 changed files with 17 additions and 3 deletions
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20
fs/nfs/dir.c
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@ -1073,6 +1073,15 @@ out_force:
goto out;
}
static void nfs_mark_dir_for_revalidate(struct inode *inode)
{
struct nfs_inode *nfsi = NFS_I(inode);
spin_lock(&inode->i_lock);
nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE;
spin_unlock(&inode->i_lock);
}
/*
* We judge how long we want to trust negative
* dentries by looking at the parent inode mtime.
@ -1107,7 +1116,6 @@ nfs_lookup_revalidate_done(struct inode *dir, struct dentry *dentry,
__func__, dentry);
return 1;
case 0:
nfs_mark_for_revalidate(dir);
if (inode && S_ISDIR(inode->i_mode)) {
/* Purge readdir caches. */
nfs_zap_caches(inode);
@ -1188,6 +1196,13 @@ out:
nfs_free_fattr(fattr);
nfs_free_fhandle(fhandle);
nfs4_label_free(label);
/*
* If the lookup failed despite the dentry change attribute being
* a match, then we should revalidate the directory cache.
*/
if (!ret && nfs_verify_change_attribute(dir, dentry->d_time))
nfs_mark_dir_for_revalidate(dir);
return nfs_lookup_revalidate_done(dir, dentry, inode, ret);
}
@ -1230,7 +1245,7 @@ nfs_do_lookup_revalidate(struct inode *dir, struct dentry *dentry,
error = nfs_lookup_verify_inode(inode, flags);
if (error) {
if (error == -ESTALE)
nfs_zap_caches(dir);
nfs_mark_dir_for_revalidate(dir);
goto out_bad;
}
nfs_advise_use_readdirplus(dir);
@ -1725,7 +1740,6 @@ out:
dput(parent);
return d;
out_error:
nfs_mark_for_revalidate(dir);
d = ERR_PTR(error);
goto out;
}