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NFS: nfs_rename() handle -ERESTARTSYS dentry left behind 

An interrupted rename will leave the old dentry behind if the rename
succeeds.  Fix this by moving the final local work of the rename to
rpc_call_done so that the results of the RENAME can always be handled,
even if the original process has already returned with -ERESTARTSYS.

Signed-off-by: Benjamin Coddington <bcodding@redhat.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Benjamin Coddington 2017-02-01 00:00:07 -05:00 committed by Anna Schumaker
parent 68e33bd6bb
commit 920b4530fb
1 changed files with 25 additions and 11 deletions
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36
fs/nfs/dir.c
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@ -2002,6 +2002,29 @@ nfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry)
}
EXPORT_SYMBOL_GPL(nfs_link);
static void
nfs_complete_rename(struct rpc_task *task, struct nfs_renamedata *data)
{
struct dentry *old_dentry = data->old_dentry;
struct dentry *new_dentry = data->new_dentry;
struct inode *old_inode = d_inode(old_dentry);
struct inode *new_inode = d_inode(new_dentry);
nfs_mark_for_revalidate(old_inode);
switch (task->tk_status) {
case 0:
if (new_inode != NULL)
nfs_drop_nlink(new_inode);
d_move(old_dentry, new_dentry);
nfs_set_verifier(new_dentry,
nfs_save_change_attribute(data->new_dir));
break;
case -ENOENT:
nfs_dentry_handle_enoent(old_dentry);
}
}
/*
* RENAME
* FIXME: Some nfsds, like the Linux user space nfsd, may generate a
@ -2084,7 +2107,8 @@ int nfs_rename(struct inode *old_dir, struct dentry *old_dentry,
if (new_inode != NULL)
NFS_PROTO(new_inode)->return_delegation(new_inode);
task = nfs_async_rename(old_dir, new_dir, old_dentry, new_dentry, NULL);
task = nfs_async_rename(old_dir, new_dir, old_dentry, new_dentry,
nfs_complete_rename);
if (IS_ERR(task)) {
error = PTR_ERR(task);
goto out;
@ -2094,21 +2118,11 @@ int nfs_rename(struct inode *old_dir, struct dentry *old_dentry,
if (error == 0)
error = task->tk_status;
rpc_put_task(task);
nfs_mark_for_revalidate(old_inode);
out:
if (rehash)
d_rehash(rehash);
trace_nfs_rename_exit(old_dir, old_dentry,
new_dir, new_dentry, error);
if (!error) {
if (new_inode != NULL)
nfs_drop_nlink(new_inode);
d_move(old_dentry, new_dentry);
nfs_set_verifier(new_dentry,
nfs_save_change_attribute(new_dir));
} else if (error == -ENOENT)
nfs_dentry_handle_enoent(old_dentry);
/* new dentry created? */
if (dentry)
dput(dentry);