5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Chuck Lever <chuck.lever@xxxxxxxxxx> [ Upstream commit 5f5f8b6d655fd947e899b1771c2f7cb581a06764 ] nfsd_unlink() can kick off a CB_RECALL (via vfs_unlink() -> leases_conflict()) if a delegation is present. Before returning NFS4ERR_DELAY, give the client holding that delegation a chance to return it and then retry the nfsd_unlink() again, once. Link: https://bugzilla.linux-nfs.org/show_bug.cgi?id=354 Tested-by: Igor Mammedov <imammedo@xxxxxxxxxx> Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx> Reviewed-by: Jeff Layton <jlayton@xxxxxxxxxx> Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx> --- fs/nfsd/vfs.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c index 4c5cc142562b2..d17377148b669 100644 --- a/fs/nfsd/vfs.c +++ b/fs/nfsd/vfs.c @@ -1790,9 +1790,18 @@ nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, fh_fill_pre_attrs(fhp); if (type != S_IFDIR) { + int retries; + if (rdentry->d_sb->s_export_op->flags & EXPORT_OP_CLOSE_BEFORE_UNLINK) nfsd_close_cached_files(rdentry); - host_err = vfs_unlink(&init_user_ns, dirp, rdentry, NULL); + + for (retries = 1;;) { + host_err = vfs_unlink(&init_user_ns, dirp, rdentry, NULL); + if (host_err != -EAGAIN || !retries--) + break; + if (!nfsd_wait_for_delegreturn(rqstp, rinode)) + break; + } } else { host_err = vfs_rmdir(&init_user_ns, dirp, rdentry); } -- 2.43.0
