From 466e16f0920f3ffdfa49713212fa334fb3dc08f1 Mon Sep 17 00:00:00 2001 From: NeilBrown Date: Thu, 28 Nov 2019 13:56:43 +1100 Subject: [PATCH] nfsd: check for EBUSY from vfs_rmdir/vfs_unink. vfs_rmdir and vfs_unlink can return -EBUSY if the target is a mountpoint. This currently gets passed to nfserrno() by nfsd_unlink(), and that results in a WARNing, which is not user-friendly. Possibly the best NFSv4 error is NFS4ERR_FILE_OPEN, because there is a sense in which the object is currently in use by some other task. The Linux NFSv4 client will map this back to EBUSY, which is an added benefit. For NFSv3, the best we can do is probably NFS3ERR_ACCES, which isn't true, but is not less true than the other options. Signed-off-by: NeilBrown Signed-off-by: J. Bruce Fields --- fs/nfsd/nfsd.h | 3 ++- fs/nfsd/vfs.c | 12 +++++++++++- 2 files changed, 13 insertions(+), 2 deletions(-) diff --git a/fs/nfsd/nfsd.h b/fs/nfsd/nfsd.h index af29475..57b93d9 100644 --- a/fs/nfsd/nfsd.h +++ b/fs/nfsd/nfsd.h @@ -280,7 +280,8 @@ void nfsd_lockd_shutdown(void); #define nfserr_union_notsupp cpu_to_be32(NFS4ERR_UNION_NOTSUPP) #define nfserr_offload_denied cpu_to_be32(NFS4ERR_OFFLOAD_DENIED) #define nfserr_wrong_lfs cpu_to_be32(NFS4ERR_WRONG_LFS) -#define nfserr_badlabel cpu_to_be32(NFS4ERR_BADLABEL) +#define nfserr_badlabel cpu_to_be32(NFS4ERR_BADLABEL) +#define nfserr_file_open cpu_to_be32(NFS4ERR_FILE_OPEN) /* error codes for internal use */ /* if a request fails due to kmalloc failure, it gets dropped. diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c index cf423fea..c0dc491 100644 --- a/fs/nfsd/vfs.c +++ b/fs/nfsd/vfs.c @@ -1815,7 +1815,17 @@ nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, out_drop_write: fh_drop_write(fhp); out_nfserr: - err = nfserrno(host_err); + if (host_err == -EBUSY) { + /* name is mounted-on. There is no perfect + * error status. + */ + if (nfsd_v4client(rqstp)) + err = nfserr_file_open; + else + err = nfserr_acces; + } else { + err = nfserrno(host_err); + } out: return err; } -- 2.7.4