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NFS: Return valid errors from nfs2/3_decode_dirent()

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Valid return values for decode_dirent() callback functions are:
 0: Success
 -EBADCOOKIE: End of directory
 -EAGAIN: End of xdr_stream

All errors need to map into one of those three values.

Fixes: 573c4e1ef5 ("NFS: Simplify ->decode_dirent() calling sequence")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
Trond Myklebust 2022-02-24 10:59:37 -05:00
parent b38e09b9b6
commit 64cfca85ba
2 changed files with 7 additions and 16 deletions
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2
fs/nfs/nfs2xdr.c
View File

@ -949,7 +949,7 @@ int nfs2_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
error = decode_filename_inline(xdr, &entry->name, &entry->len);
if (unlikely(error))
return error;
return -EAGAIN;
/*
* The type (size and byte order) of nfscookie isn't defined in

21
fs/nfs/nfs3xdr.c
View File

@ -1967,7 +1967,6 @@ int nfs3_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
bool plus)
{
struct user_namespace *userns = rpc_userns(entry->server->client);
struct nfs_entry old = *entry;
__be32 *p;
int error;
u64 new_cookie;
@ -1987,15 +1986,15 @@ int nfs3_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
error = decode_fileid3(xdr, &entry->ino);
if (unlikely(error))
return error;
return -EAGAIN;
error = decode_inline_filename3(xdr, &entry->name, &entry->len);
if (unlikely(error))
return error;
return -EAGAIN;
error = decode_cookie3(xdr, &new_cookie);
if (unlikely(error))
return error;
return -EAGAIN;
entry->d_type = DT_UNKNOWN;
@ -2003,7 +2002,7 @@ int nfs3_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
entry->fattr->valid = 0;
error = decode_post_op_attr(xdr, entry->fattr, userns);
if (unlikely(error))
return error;
return -EAGAIN;
if (entry->fattr->valid & NFS_ATTR_FATTR_V3)
entry->d_type = nfs_umode_to_dtype(entry->fattr->mode);
@ -2018,11 +2017,8 @@ int nfs3_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
return -EAGAIN;
if (*p != xdr_zero) {
error = decode_nfs_fh3(xdr, entry->fh);
if (unlikely(error)) {
if (error == -E2BIG)
goto out_truncated;
return error;
}
if (unlikely(error))
return -EAGAIN;
} else
zero_nfs_fh3(entry->fh);
}
@ -2031,11 +2027,6 @@ int nfs3_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
entry->cookie = new_cookie;
return 0;
out_truncated:
dprintk("NFS: directory entry contains invalid file handle\n");
*entry = old;
return -EAGAIN;
}
/*