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NFS: Add a helper to remove case-insensitive aliases

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When dealing with case insensitive names, the client has no idea how the
server performs the mapping, so cannot collapse the dentries into a
single representative. So both rename and unlink need to deal with the
fact that there could be several dentries representing the file, and
have to somehow force them to be revalidated. Use d_prune_aliases() as a
big hammer approach.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Trond Myklebust 2021-12-17 15:36:57 -05:00 • committed by Anna Schumaker
parent 8ce37abdeb
commit 00bdadc7ac
3 changed files with 16 additions and 2 deletions
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5
fs/nfs/nfs4proc.c
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@ -4670,8 +4670,10 @@ static void nfs4_proc_unlink_setup(struct rpc_message *msg,
nfs_fattr_init(res->dir_attr);
if (inode)
if (inode) {
nfs4_inode_return_delegation(inode);
nfs_d_prune_case_insensitive_aliases(inode);
}
}
static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
@ -4737,6 +4739,7 @@ static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
return 0;
if (task->tk_status == 0) {
nfs_d_prune_case_insensitive_aliases(d_inode(data->old_dentry));
if (new_dir != old_dir) {
/* Note: If we moved a directory, nlink will change */
nfs4_update_changeattr(old_dir, &res->old_cinfo,