mirror of https://gitee.com/openkylin/linux.git
NFS: Fix dentry revalidation for NFSv4 referrals and mountpoint crossings
As long as the directory contents haven't changed, we should just let the path walk proceed to cross the mountpoint. Apart from being an optimisation in the case of 'nohide' mountpoint traversals, it also fixes an issue with referrals: referral inodes don't have valid filehandles, so calling nfs_revalidate_inode() on them is a bug. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
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@ -710,6 +710,8 @@ int nfs_lookup_verify_inode(struct inode *inode, struct nameidata *nd)
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{
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struct nfs_server *server = NFS_SERVER(inode);
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if (test_bit(NFS_INO_MOUNTPOINT, &NFS_I(inode)->flags))
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return 0;
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if (nd != NULL) {
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/* VFS wants an on-the-wire revalidation */
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if (nd->flags & LOOKUP_REVAL)
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