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 <[email protected]>
Signed-off-by: Chuck Lever <[email protected]>
---
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 b597cb2af949..adb2624eca64 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -1773,9 +1773,18 @@ 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);
}