6.12-stable review patch. If anyone has any objections, please let me know.
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From: Chuck Lever chuck.lever@oracle.com
commit 370345b4bd184a49ac68d6591801e5e3605b355a upstream.
RFC 8881 Section 18.25.4 paragraph 5 tells us that the server should return NFS4ERR_FILE_OPEN only if the target object is an opened file. This suggests that returning this status when removing a directory will confuse NFS clients.
This is a version-specific issue; nfsd_proc_remove/rmdir() and nfsd3_proc_remove/rmdir() already return nfserr_access as appropriate.
Unfortunately there is no quick way for nfsd4_remove() to determine whether the target object is a file or not, so the check is done in in nfsd_unlink() for now.
Reported-by: Trond Myklebust trondmy@hammerspace.com Fixes: 466e16f0920f ("nfsd: check for EBUSY from vfs_rmdir/vfs_unink.") Reviewed-by: Jeff Layton jlayton@kernel.org Cc: stable@vger.kernel.org Signed-off-by: Chuck Lever chuck.lever@oracle.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/nfsd/vfs.c | 24 ++++++++++++++++++------ 1 file changed, 18 insertions(+), 6 deletions(-)
--- a/fs/nfsd/vfs.c +++ b/fs/nfsd/vfs.c @@ -1935,9 +1935,17 @@ out: return err; }
-/* - * Unlink a file or directory - * N.B. After this call fhp needs an fh_put +/** + * nfsd_unlink - remove a directory entry + * @rqstp: RPC transaction context + * @fhp: the file handle of the parent directory to be modified + * @type: enforced file type of the object to be removed + * @fname: the name of directory entry to be removed + * @flen: length of @fname in octets + * + * After this call fhp needs an fh_put. + * + * Returns a generic NFS status code in network byte-order. */ __be32 nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, @@ -2011,10 +2019,14 @@ out_drop_write: fh_drop_write(fhp); out_nfserr: if (host_err == -EBUSY) { - /* name is mounted-on. There is no perfect - * error status. + /* + * See RFC 8881 Section 18.25.4 para 4: NFSv4 REMOVE + * wants a status unique to the object type. */ - err = nfserr_file_open; + if (type != S_IFDIR) + err = nfserr_file_open; + else + err = nfserr_acces; } out: return err != nfs_ok ? err : nfserrno(host_err);